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<copyright>
<year>2004</year><year>2018</year>
<holder>Ericsson AB. All Rights Reserved.</holder>
</copyright>
<legalnotice>
Licensed under the Apache License, Version 2.0 (the "License");
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<title>Kernel Release Notes</title>
<prepared></prepared>
<docno></docno>
<date></date>
<rev></rev>
<file>notes.xml</file>
</header>
<p>This document describes the changes made to the Kernel application.</p>
<section><title>Kernel 6.1.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Fix bug causing net_kernel process crash on connection
attempt from node with name identical to local node.</p>
<p>
Own Id: OTP-15438 Aux Id: ERL-781 </p>
</item>
</list>
</section>
</section>
<section><title>Kernel 6.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
The values <c>all</c> and <c>none</c> are documented as
valid value for the Kernel configuration parameter
<c>logger_level</c>, but would cause a crash during node
start. This is now corrected.</p>
<p>
Own Id: OTP-15143</p>
</item>
<item>
<p>
Fix some potential buggy behavior in how ticks are sent
on inter node distribution connections. Tick is now sent
to c-node even if there are unsent buffered data, as
c-nodes need ticks in order to send reply ticks. The
amount of sent data was also calculated wrongly when
ticks were suppressed due to unsent buffered data.</p>
<p>
Own Id: OTP-15162 Aux Id: ERIERL-191 </p>
</item>
<item>
<p>
Non semantic change in dist_util.erl to silence dialyzer
warning.</p>
<p>
Own Id: OTP-15170</p>
</item>
<item>
<p>
Fixed <c>net_kernel:connect_node(node())</c> to return
<c>true</c> (and do nothing) as it always has before
OTP-21.0. Also documented this successful "self connect"
as the expected behavior.</p>
<p>
Own Id: OTP-15182 Aux Id: ERL-643 </p>
</item>
<item>
<p>
The single_line option on logger_formatter would in some
cases add an unwanted comma after the association arrows
in a map. This is now corrected.</p>
<p>
Own Id: OTP-15228</p>
</item>
<item>
<p>
Improved robustness of distribution connection setup. In
OTP-21.0 a truly asynchronous connection setup was
introduced. This is further improvement on that work to
make the emulator more robust and also be able to recover
in cases when involved Erlang processes misbehave.</p>
<p>
Own Id: OTP-15297 Aux Id: OTP-15279, OTP-15280 </p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
A new macro, <c>?LOG(Level,...)</c>, is added. This is
equivalent to the existing <c>?LOG_<LEVEL>(...)</c>
macros.</p>
<p>
A new variant of Logger report callback is added, which
takes an extra argument containing options for size
limiting and line breaks. Module <c>proc_lib</c> in
<c>STDLIB</c> uses this for crash reports.</p>
<p>
Logger configuration is now checked a bit more for
errors.</p>
<p>
Own Id: OTP-15132</p>
</item>
<item>
<p>
The socket options <c>recvtos</c>, <c>recvttl</c>,
<c>recvtclass</c> and <c>pktoptions</c> have been
implemented in the socket modules. See the documentation
for the <c>gen_tcp</c>, <c>gen_udp</c> and <c>inet</c>
modules. Note that support for these in the runtime
system is platform dependent. Especially for
<c>pktoptions</c> which is very Linux specific and
obsoleted by the RFCs that defined it.</p>
<p>
Own Id: OTP-15145 Aux Id: ERIERL-187 </p>
</item>
<item>
<p>
Add <c>logger:set_application_level/2</c> for setting the
logger level of all modules in one application.</p>
<p>
Own Id: OTP-15146</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 6.0.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Fixed bug in <c>net_kernel</c> that could cause an
emulator crash if certain connection attempts failed. Bug
exists since kernel-6.0 (OTP-21.0).</p>
<p>
Own Id: OTP-15280 Aux Id: ERIERL-226, OTP-15279 </p>
</item>
</list>
</section>
</section>
<section><title>Kernel 6.0</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p> Clarify the documentation of <c>rpc:multicall/5</c>.
</p>
<p>
Own Id: OTP-10551</p>
</item>
<item>
<p>
The DNS resolver when getting econnrefused from a server
retained an invalid socket so look up towards the next
server(s) also failed.</p>
<p>
Own Id: OTP-13133 Aux Id: PR-1557 </p>
</item>
<item>
<p>
No resolver backend returns V4Mapped IPv6 addresses any
more. This was inconsistent before, some did, some did
not. To facilitate working with such addresses a new
function <c>inet:ipv4_mapped_ipv6_address/1</c> has been
added.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-13761 Aux Id: ERL-503 </p>
</item>
<item>
<p>
The type specifications for <c>file:posix/0</c> and
<c>inet:posix/0</c> have been updated according to which
errors file and socket operations should be able to
return.</p>
<p>
Own Id: OTP-14019 Aux Id: ERL-550 </p>
</item>
<item>
<p>
Fix name resolving in IPv6 only environments when doing
the initial distributed connection.</p>
<p>
Own Id: OTP-14501</p>
</item>
<item>
<p> File operations used to accept <seealso
marker="kernel:file#type-name_all">filenames</seealso>
containing null characters (integer value zero). This
caused the name to be truncated and in some cases
arguments to primitive operations to be mixed up.
Filenames containing null characters inside the filename
are now <em>rejected</em> and will cause primitive file
operations to fail. </p> <p> Also environment variable
operations used to accept <seealso
marker="kernel:os#type-env_var_name">names</seealso> and
<seealso
marker="kernel:os#type-env_var_value">values</seealso> of
environment variables containing null characters (integer
value zero). This caused operations to silently produce
erroneous results. Environment variable names and values
containing null characters inside the name or value are
now <em>rejected</em> and will cause environment variable
operations to fail. </p> <p>Primitive environment
variable operations also used to accept the <c>$=</c>
character in environment variable names causing various
problems. <c>$=</c> characters in environment variable
names are now also <em>rejected</em>. </p> <p>Also
<seealso
marker="kernel:os#cmd/1"><c>os:cmd/1</c></seealso> now
reject null characters inside its <seealso
marker="kernel:os#type-os_command">command</seealso>.
</p> <p><seealso
marker="erts:erlang#open_port/2"><c>erlang:open_port/2</c></seealso>
will also reject null characters inside the port name
from now on.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-14543 Aux Id: ERL-370 </p>
</item>
<item>
<p><c>os:putenv</c> and <c>os:getenv</c> no longer access
the process environment directly and instead work on a
thread-safe emulation. The only observable difference is
that it's <em>not</em> kept in sync with libc
<c>getenv(3)</c> / <c>putenv(3)</c>, so those who relied
on that behavior in drivers or NIFs will need to add
manual synchronization.</p> <p>On Windows this means that
you can no longer resolve DLL dependencies by modifying
the <c>PATH</c> just before loading the driver/NIF. To
make this less of a problem, the emulator now adds the
target DLL's folder to the DLL search path.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-14666</p>
</item>
<item>
<p>
Fixed connection tick toward primitive hidden nodes
(erl_interface) that could cause faulty tick timeout in
rare cases when payload data is sent to hidden node but
not received.</p>
<p>
Own Id: OTP-14681</p>
</item>
<item>
<p>
Make group react immediately on an EXIT-signal from shell
in e.g ssh.</p>
<p>
Own Id: OTP-14991 Aux Id: PR1705 </p>
</item>
<item>
<p>
Calls to <c>gen_tcp:send/2</c> on closed sockets now
returns <c>{error, closed}</c> instead of
<c>{error,enotconn}</c>.</p>
<p>
Own Id: OTP-15001</p>
</item>
<item>
<p>
The <c>included_applications</c> key are no longer
duplicated as application environment variable. Earlier,
the included applications could be read both with
<c>application:get[_all]_env(...)</c> and
<c>application:get[_all]_key(...)</c> functions. Now, it
can only be read with
<c>application:get[_all]_key(...)</c>.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-15071</p>
</item>
<item>
<p>Owner and group changes through
<c>file:write_file_info</c>, <c>file:change_owner</c>,
and <c>file:change_group</c> will no longer report
success on permission errors.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-15118</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>A new logging API is added to Erlang/OTP, see the
<seealso
marker="kernel:logger"><c>logger(3)</c></seealso> manual
page, and section <seealso
marker="kernel:logger_chapter">Logging</seealso> in the
Kernel User's Guide.</p>
<p>Calls to <c>error_logger</c> are automatically
redirected to the new API, and legacy error logger event
handlers can still be used. It is, however, recommended
to use the Logger API directly when writing new code.</p>
<p>Notice the following potential incompatibilities:</p>
<list> <item><p>Kernel configuration parameters
<c>error_logger</c> still works, but is overruled if the
default handler's output destination is configured with
Kernel configuration parameter <c>logger</c>.</p> <p>In
general, parameters for configuring error logger are
overwritten by new parameters for configuring
Logger.</p></item> <item><p>The concept of SASL error
logging is deprecated, meaning that by default the SASL
application does not affect which log events are
logged.</p> <p>By default, supervisor reports and crash
reports are logged by the default Logger handler started
by Kernel, and end up at the same destination (terminal
or file) as other standard log event from Erlang/OTP.</p>
<p>Progress reports are not logged by default, but can be
enabled by setting the primary log level to info, for
example with the Kernel configuration parameter
<c>logger_level</c>.</p> <p>To obtain backwards
compatibility with the SASL error logging functionality
from earlier releases, set Kernel configuration parameter
<c>logger_sasl_compatible</c> to <c>true</c>. This
prevents the default Logger handler from logging any
supervisor-, crash-, or progress reports. Instead, SASL
adds a separate Logger handler during application start,
which takes care of these log events. The SASL
configuration parameters <c>sasl_error_logger</c> and
<c>sasl_errlog_type</c> specify the destination (terminal
or file) and severity level to log for these
events.</p></item></list>
<p>
Since Logger is new in Erlang/OTP 21.0, we do reserve the
right to introduce changes to the Logger API and
functionality in patches following this release. These
changes might or might not be backwards compatible with
the initial version.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-13295</p>
</item>
<item>
<p>
The function <c>inet:i/0</c> has been documented.</p>
<p>
Own Id: OTP-13713 Aux Id: PR-1645 </p>
</item>
<item>
<p>
Typespecs for <c>netns</c> and <c>bind_to_device</c>
options have been added to <c>gen_tcp</c>, <c>gen_udp</c>
and <c>gen_sctp</c> functions.</p>
<p>
Own Id: OTP-14359 Aux Id: PR-1816 </p>
</item>
<item>
<p>
New functionality for implementation of alternative
carriers for the Erlang distribution has been introduced.
This mainly consists of support for usage of distribution
controller processes (previously only ports could be used
as distribution controllers). For more information see
<seealso marker="erts:alt_dist#distribution_module">ERTS
User's Guide ➜ How to implement an Alternative Carrier
for the Erlang Distribution ➜ Distribution
Module</seealso>.</p>
<p>
Own Id: OTP-14459</p>
</item>
<item>
<p><c>seq_trace</c> labels may now be any erlang
term.</p>
<p>
Own Id: OTP-14899</p>
</item>
<item>
<p>
The SSL distribution protocol <c>-proto inet_tls</c> has
stopped setting the SSL option
<c>server_name_indication</c>. New verify funs for client
and server in <c>inet_tls_dist</c> has been added, not
documented yet, that checks node name if present in peer
certificate. Usage is still also yet to be documented.</p>
<p>
Own Id: OTP-14969 Aux Id: OTP-14465, ERL-598 </p>
</item>
<item>
<p>
Changed timeout of <c>gen_server</c> calls to <c>auth</c>
server from default 5 seconds to <c>infinity</c>.</p>
<p>
Own Id: OTP-15009 Aux Id: ERL-601 </p>
</item>
<item>
<p>The callback module passed as <c>-epmd_module</c> to
erl has been expanded to be able to do name and port
resolving.</p> <p>Documentation has also been added in
the <seealso
marker="kernel:erl_epmd"><c>erl_epmd</c></seealso>
reference manual and ERTS User's Guide <seealso
marker="erts:alt_disco">How to Implement an Alternative
Service Discovery for Erlang Distribution</seealso>.</p>
<p>
Own Id: OTP-15086 Aux Id: PR-1694 </p>
</item>
<item>
<p>
Included config file specified with relative path in
sys.config are now first searched for relative to the
directory of sys.config itself. If not found, it is also
searched for relative to the current working directory.
The latter is for backwards compatibility.</p>
<p>
Own Id: OTP-15137 Aux Id: PR-1838 </p>
</item>
</list>
</section>
</section>
<section><title>Kernel 5.4.3.2</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Non semantic change in dist_util.erl to silence dialyzer
warning.</p>
<p>
Own Id: OTP-15170</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 5.4.3.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Fix some potential buggy behavior in how ticks are sent
on inter node distribution connections. Tick is now sent
to c-node even if there are unsent buffered data, as
c-nodes need ticks in order to send reply ticks. The
amount of sent data was calculated wrongly when ticks
where suppressed due to unsent buffered data.</p>
<p>
Own Id: OTP-15162 Aux Id: ERIERL-191 </p>
</item>
</list>
</section>
</section>
<section><title>Kernel 5.4.3</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p> Correct a few contracts. </p>
<p>
Own Id: OTP-14889</p>
</item>
<item>
<p>
Reject loading modules with names containing directory
separators ('/' or '\' on Windows).</p>
<p>
Own Id: OTP-14933 Aux Id: ERL-564, PR-1716 </p>
</item>
<item>
<p>
Fix bug in handling of os:cmd/2 option max_size on
windows.</p>
<p>
Own Id: OTP-14940</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 5.4.2</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Add <c>os:cmd/2</c> that takes an options map as the
second argument.</p>
<p>
Add <c>max_size</c> as an option to <c>os:cmd/2</c> that
control the maximum size of the result that
<c>os:cmd/2</c> will return.</p>
<p>
Own Id: OTP-14823</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 5.4.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Refactored an internal API.</p>
<p>
Own Id: OTP-14784</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 5.4</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Processes which did output after switching jobs (Ctrl+G)
could be left forever stuck in the io request.</p>
<p>
Own Id: OTP-14571 Aux Id: ERL-472 </p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>Lock counting can now be fully toggled at runtime in
the lock counting emulator (<c>-emu_type lcnt</c>).
Everything is enabled by default to match the old
behavior, but specific categories can be toggled at will
with minimal runtime overhead when disabled. Refer to the
documentation on <c>lcnt:rt_mask/1</c> for details.</p>
<p>
Own Id: OTP-13170</p>
</item>
<item>
<p><c>lcnt:collect</c> and <c>lcnt:clear</c> will no
longer block all other threads in the runtime system.</p>
<p>
Own Id: OTP-14412</p>
</item>
<item>
<p>
General Unicode improvements.</p>
<p>
Own Id: OTP-14462</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 5.3.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>The documentation for the 'quiet' option in
disk_log:open/1 had an incorrect default value.</p>
<p>
Own Id: OTP-14498</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 5.3</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>Function <c>inet:ntoa/1</c> has been fixed to return
lowercase letters according to RFC 5935 that has been
approved after this function was written. Previously
uppercase letters were returned so this may be a
backwards incompatible change depending on how the
returned address string is used.</p>
<p>Function <c>inet:parse_address/1</c> has been fixed to
accept %-suffixes on scoped addresses. The addresses does
not work yet, but gives no parse errors.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-13006 Aux Id: ERIERL-20, ERL-429 </p>
</item>
<item>
<p>
Fix bug where gethostname would incorrectly fail with
enametoolong on Linux.</p>
<p>
Own Id: OTP-14310</p>
</item>
<item>
<p>
Fix bug causing <c>code:is_module_native</c> to falsely
return true when <c>local</c> call trace is enabled for
the module.</p>
<p>
Own Id: OTP-14390</p>
</item>
<item>
<p>
Add early reject of invalid node names from distributed
nodes.</p>
<p>
Own Id: OTP-14426</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
Since Unicode is now allowed in atoms an extra check is
needed for node names, which are restricted to Latin-1.</p>
<p>
Own Id: OTP-13805</p>
</item>
<item>
<p>Replaced usage of deprecated symbolic <seealso
marker="erts:erlang#type-time_unit"><c>time
unit</c></seealso> representations.</p>
<p>
Own Id: OTP-13831 Aux Id: OTP-13735 </p>
</item>
<item>
<p><c>file:write_file(Name, Data, [raw])</c> would turn
<c>Data</c> into a single binary before writing. This
meant it could not take advantage of the <c>writev()</c>
system call if it was given a list of binaries and told
to write with <c>raw</c> mode.</p>
<p>
Own Id: OTP-13909</p>
</item>
<item>
<p>The performance of the <c>disk_log</c> has been
somewhat improved in some corner cases (big items), and
the documentation has been clarified. </p>
<p>
Own Id: OTP-14057 Aux Id: PR-1245 </p>
</item>
<item>
<p>Functions for detecting changed code has been added.
<c>code:modified_modules/0</c> returns all currently
loaded modules that have changed on disk.
<c>code:module_status/1</c> returns the status for a
module. In the shell and in <c>c</c> module, <c>mm/0</c>
is short for <c>code:modified_modules/0</c>, and
<c>lm/0</c> reloads all currently loaded modules that
have changed on disk.</p>
<p>
Own Id: OTP-14059</p>
</item>
<item>
<p>
Introduce an event manager in Erlang to handle OS
signals. A subset of OS signals may be subscribed to and
those are described in the Kernel application.</p>
<p>
Own Id: OTP-14186</p>
</item>
<item>
<p> Sockets can now be bound to device (SO_BINDTODEVICE)
on platforms where it is supported. </p> <p> This has
been implemented e.g to support VRF-Lite under Linux; see
<url
href="https://www.kernel.org/doc/Documentation/networking/vrf.txt">
VRF </url>, and GitHub pull request <url
href="https://github.com/erlang/otp/pull/1326">#1326</url>.
</p>
<p>
Own Id: OTP-14357 Aux Id: PR-1326 </p>
</item>
<item>
<p>
Added option to store shell_history on disk so that the
history can be reused between sessions.</p>
<p>
Own Id: OTP-14409 Aux Id: PR-1420 </p>
</item>
<item>
<p> The size of crash reports created by
<c>gen_server</c>, <c>gen_statem</c> and <c>proc_lib</c>
is limited with aid of the Kernel application variable
<c>error_logger_format_depth</c>. The purpose is to limit
the size of the messages sent to the <c>error_logger</c>
process when processes with huge message queues or states
crash. </p> <p>The crash report generated by
<c>proc_lib</c> includes the new tag
<c>message_queue_len</c>. The neighbour report also
includes the new tag <c>current_stacktrace</c>. Finally,
the neighbour report no longer includes the tags
<c>messages</c> and <c>dictionary</c>. </p> <p> The new
function <c>error_logger:get_format_depth/0</c> can be
used to retrieve the value of the Kernel application
variable <c>error_logger_format_depth</c>. </p>
<p>
Own Id: OTP-14417</p>
</item>
<item>
<p> One of the ETS tables used by the <c>global</c>
module is created with <c>{read_concurrency, true}</c> in
order to reduce contention. </p>
<p>
Own Id: OTP-14419</p>
</item>
<item>
<p>
Warnings have been added to the relevant documentation
about not using un-secure distributed nodes in exposed
environments.</p>
<p>
Own Id: OTP-14425</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 5.2</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Fix a race during cleanup of os:cmd that would cause
os:cmd to hang indefinitely.</p>
<p>
Own Id: OTP-14232 Aux Id: seq13275 </p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>The functions in the '<c>file</c>' module that take a
list of paths (e.g. <c>file:path_consult/2</c>) will now
continue to search in the path if the path contains
something that is not a directory.</p>
<p>
Own Id: OTP-14191</p>
</item>
<item>
<p>Two OTP processes that are known to receive many
messages are 'rex' (used by 'rpc') and 'error_logger'.
Those processes will now store unprocessed messages
outside the process heap, which will potentially decrease
the cost of garbage collections.</p>
<p>
Own Id: OTP-14192</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 5.1.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
<c>code:add_pathsa/1</c> and command line option
<c>-pa</c> both revert the given list of directories when
adding it at the beginning of the code path. This is now
documented.</p>
<p>
Own Id: OTP-13920 Aux Id: ERL-267 </p>
</item>
<item>
<p>
Add lost runtime dependency to erts-8.1. This should have
been done in kernel-5.1 (OTP-19.1) as it cannot run
without at least erts-8.1 (OTP-19.1).</p>
<p>
Own Id: OTP-14003</p>
</item>
<item>
<p>
Type and doc for gen_{tcp,udp,sctp}:controlling_process/2
has been improved.</p>
<p>
Own Id: OTP-14022 Aux Id: PR-1208 </p>
</item>
</list>
</section>
</section>
<section><title>Kernel 5.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Fix a memory leak when calling
seq_trace:get_system_tracer().</p>
<p>
Own Id: OTP-13742</p>
</item>
<item>
<p>
Fix for the problem that when adding the ebin directory
of an application to the code path, the
<c>code:priv_dir/1</c> function returns an incorrect path
to the priv directory of the same application.</p>
<p>
Own Id: OTP-13758 Aux Id: ERL-195 </p>
</item>
<item>
<p>
Fix code_server crash when adding code paths of two
levels.</p>
<p>
Own Id: OTP-13765 Aux Id: ERL-194 </p>
</item>
<item>
<p>
Respect -proto_dist switch while connection to EPMD</p>
<p>
Own Id: OTP-13770 Aux Id: PR-1129 </p>
</item>
<item>
<p>
Fixed a bug where init:stop could deadlock if a process
with infinite shutdown timeout (e.g. a supervisor)
attempted to load code while terminating.</p>
<p>
Own Id: OTP-13802</p>
</item>
<item>
<p>
Close stdin of commands run in os:cmd. This is a
backwards compatibility fix that restores the behaviour of
pre 19.0 os:cmd.</p>
<p>
Own Id: OTP-13867 Aux Id: seq13178 </p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
Add <c>net_kernel:setopts/2</c> and
<c>net_kernel:getopts/2</c> to control options for
distribution sockets in runtime.</p>
<p>
Own Id: OTP-13564</p>
</item>
<item>
<p>
Rudimentary support for DSCP has been implemented
in the guise of a <c>tclass</c> socket option
for IPv6 sockets.</p>
<p>
Own Id: OTP-13582</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 5.0.2</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
When calling os:cmd from a process that has set trap_exit
to true an 'EXIT' message would be left in the message
queue. This bug was introduced in kernel vsn 5.0.1.</p>
<p>
Own Id: OTP-13813</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 5.0.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Fix a os:cmd bug where creating a background job using
& would cause os:cmd to hang until the background job
terminated or closed its stdout and stderr file
descriptors. This bug has existed from kernel 5.0.</p>
<p>
Own Id: OTP-13741</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 5.0</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>The handling of <c>on_load</c> functions has been
improved. The major improvement is that if a code upgrade
fails because the <c>on_load</c> function fails, the
previous version of the module will now be retained.</p>
<p>
Own Id: OTP-12593</p>
</item>
<item>
<p><c>rpc:call()</c> and <c>rpc:block_call()</c> would
sometimes cause an exception (which was not mentioned in
the documentation). This has been corrected so that
<c>{badrpc,Reason}</c> will be returned instead.</p>
<p>
Own Id: OTP-13409</p>
</item>
<item>
<p>On Windows, for modules that were loaded early (such
as the <c>lists</c> module), <c>code:which/1</c> would
return the path with mixed slashes and backslashes, for
example: <c>"C:\\Program
Files\\erl8.0/lib/stdlib-2.7/ebin/lists.beam"</c>. This
has been corrected.</p>
<p>
Own Id: OTP-13410</p>
</item>
<item>
<p>
Make file:datasync use fsync instead of fdatasync on Mac
OSX.</p>
<p>
Own Id: OTP-13411</p>
</item>
<item>
<p>
The default chunk size for the fallback sendfile
implementation, used on platforms that do not have a
native sendfile, has been decreased in order to reduce
connectivity issues.</p>
<p>
Own Id: OTP-13444</p>
</item>
<item>
<p>
Large file writes (2Gb or more) could fail on some Unix
platforms (for example, OS X and FreeBSD).</p>
<p>
Own Id: OTP-13461</p>
</item>
<item>
<p>
A bug has been fixed where the DNS resolver inet_res did
not refresh its view of the contents of for example
resolv.conf immediately after start and hence then failed
name resolution. Reported and fix suggested by Michal
Ptaszek in GitHUB pull req #949.</p>
<p>
Own Id: OTP-13470 Aux Id: Pull #969 </p>
</item>
<item>
<p>
Fix process leak from global_group.</p>
<p>
Own Id: OTP-13516 Aux Id: PR-1008 </p>
</item>
<item>
<p>
The function <c>inet:gethostbyname/1</c> now honors the
resolver option <c>inet6</c> instead of always looking up
IPv4 addresses.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-13622 Aux Id: PR-1065 </p>
</item>
<item>
<p>
The <c>Status</c> argument to <c>init:stop/1</c> is now
sanity checked to make sure <c>erlang:halt</c> does not
fail.</p>
<p>
Own Id: OTP-13631 Aux Id: PR-911 </p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
Add {line_delim, byte()} option to inet:setopts/2 and
decode_packet/3</p>
<p>
Own Id: OTP-12837</p>
</item>
<item>
<p>
Added <seealso
marker="kernel:os#perf_counter/1">os:perf_counter/1</seealso>.</p>
<p>
The perf_counter is a very very cheap and high resolution
timer that can be used to timestamp system events. It
does not have monoticity guarantees, but should on most
OS's expose a monotonous time.</p>
<p>
Own Id: OTP-12908</p>
</item>
<item>
<p>
The os:cmd call has been optimized on unix platforms to
be scale better with the number of schedulers.</p>
<p>
Own Id: OTP-13089</p>
</item>
<item>
<p>New functions that can load multiple modules at once
have been added to the '<c>code</c>' module. The
functions are <c>code:atomic_load/1</c>,
<c>code:prepare_loading/1</c>,
<c>code:finish_loading/1</c>, and
<c>code:ensure_modules_loaded/1</c>.</p>
<p>
Own Id: OTP-13111</p>
</item>
<item>
<p>
The code path cache feature turned out not to be very
useful in practice and has been removed. If an attempt is
made to enable the code path cache, there will be a
warning report informing the user that the feature has
been removed.</p>
<p>
Own Id: OTP-13191</p>
</item>
<item>
<p>When an attempt is made to start a distributed Erlang
node with the same name as an existing node, the error
message will be much shorter and easier to read than
before. Example:</p>
<p><c>Protocol 'inet_tcp': the name somename@somehost
seems to be in use by another Erlang node</c></p>
<p>
Own Id: OTP-13294</p>
</item>
<item>
<p>
The output of the default error logger is somewhat
prettier and easier to read. The default error logger is
used during start-up of the OTP system. If the start-up
fails, the output will be easier to read.</p>
<p>
Own Id: OTP-13325</p>
</item>
<item>
<p>The functions <c>rpc:safe_multi_server_call/2,3</c>
that were deprecated in R12B have been removed.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-13449</p>
</item>
<item>
<p>
Update the error reasons in dist_util, and show them in
the logs if net_kernel:verbose(1) has been called.</p>
<p>
Own Id: OTP-13458</p>
</item>
<item>
<p>
Experimental support for Unix Domain Sockets has been
implemented. Read the sources if you want to try it out.
Example: <c>gen_udp:open(0,
[{ifaddr,{local,"/tmp/socket"}}])</c>. Documentation will
be written after user feedback on the experimental API.</p>
<p>
Own Id: OTP-13572 Aux Id: PR-612 </p>
</item>
<item>
<p>
Allow heart to be configured to not kill the previous
emulator before calling the HEART_COMMAND. This is done
by setting the environment variable HEART_NO_KILL to
TRUE.</p>
<p>
Own Id: OTP-13650</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 4.2</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p><c>code:load_abs([10100])</c> would bring down the
entire runtime system and create a crash dump. Corrected
to generate an error exception in the calling
process.</p>
<p>Also corrected specs for code loading functions and
added more information in the documentation about the
error reasons returned by code-loading functions.</p>
<p>
Own Id: OTP-9375</p>
</item>
<item>
<p>
<seealso
marker="kernel:gen_tcp#accept/2"><c>gen_tcp:accept/2</c></seealso>
was not <seealso
marker="erts:time_correction#Time_Warp_Safe_Code">time
warp safe</seealso>. This since it used the same time as
returned by <seealso
marker="erts:erlang#now/0"><c>erlang:now/0</c></seealso>
when calculating timeout. This has now been fixed.</p>
<p>
Own Id: OTP-13254 Aux Id: OTP-11997, OTP-13222 </p>
</item>
<item>
<p> Correct the contract for <c>inet:getifaddrs/1</c>.
</p>
<p>
Own Id: OTP-13335 Aux Id: ERL-95 </p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
Time warp safety improvements.</p>
<p>
Introduced the options <c>monotonic_timestamp</c>, and
<c>strict_monotonic_timestamp</c> to the trace,
sequential trace, and system profile functionality. This
since the already existing <c>timestamp</c> option is not
time warp safe.</p>
<p>
Introduced the option <c>safe_fixed_monotonic_time</c> to
<c>ets:info/2</c> and <c>dets:info/2</c>. This since the
already existing <c>safe_fixed</c> option is not time
warp safe.</p>
<p>
Own Id: OTP-13222 Aux Id: OTP-11997 </p>
</item>
<item>
<p>
Add validation callback for heart</p>
<p>
The erlang heart process may now have a validation
callback installed. The validation callback will be
executed, if present, before any heartbeat to heart port
program. If the validation fails, or stalls, no heartbeat
will be sent and the node will go down.</p>
<p>
With the option <c>'check_schedulers'</c> heart executes
a responsiveness check of the schedulers before a
heartbeat is sent to the port program. If the
responsiveness check fails, the heartbeat will not be
performed (as intended).</p>
<p>
Own Id: OTP-13250</p>
</item>
<item>
<p>
Clarify documentation of <c>net_kernel:allow/1</c></p>
<p>
Own Id: OTP-13299</p>
</item>
<item>
<p>
EPMD supports both IPv4 and IPv6</p>
<p>
Also affects oldest supported windows version.</p>
<p>
Own Id: OTP-13364</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 4.1.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Host name lookups though inet_res, the Erlang DNS
resolver, are now done case insensitively according to
RFC 4343. Patch by Holger Weiß.</p>
<p>
Own Id: OTP-12836</p>
</item>
<item>
<p>
IPv6 distribution handler has been updated to share code
with IPv4 so that all features are supported in IPv6 as
well. A bug when using an IPv4 address as hostname has
been fixed.</p>
<p>
Own Id: OTP-13040</p>
</item>
<item>
<p>
Caching of host names in the internal DNS resolver
inet_res has been made character case insensitive for
host names according to RFC 4343.</p>
<p>
Own Id: OTP-13083</p>
</item>
<item>
<p>Cooked file mode buffering has been fixed so
file:position/2 now works according to Posix on Posix
systems i.e. when file:position/2 returns an error the
file pointer is unaffected.</p> <p>The Windows system
documentation, however, is unclear on this point so the
documentation of file:position/2 still does not promise
anything.</p> <p>Cooked file mode file:pread/2,3 and
file:pwrite/2,3 have been corrected to honor character
encoding like the combination of file:position/2 and
file:read/2 or file:write/2 already does. This is
probably not very useful since the character
representation on the caller's side is latin1,
period.</p>
<p>
Own Id: OTP-13155 Aux Id: PR#646 </p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
Add {line_delim, byte()} option to inet:setopts/2 and
decode_packet/3</p>
<p>
Own Id: OTP-12837</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 4.1</title>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>A mechanism for limiting the amount of text that the
built-in error logger events will produce has been
introduced. It is useful for limiting both the size of
log files and the CPU time used to produce them.</p>
<p>This mechanism is experimental in the sense that it
may be changed if it turns out that it does not solve the
problem it is supposed to solve. In that case, there may
be backward incompatible improvements to this
mechanism.</p>
<p>See the documentation for the config parameter
<c>error_logger_format_depth</c> in the Kernel
application for information about how to turn on this
feature.</p>
<p>
Own Id: OTP-12864</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 4.0</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Fix error handling in <c>file:read_line/1</c> for Unicode
contents.</p>
<p>
Own Id: OTP-12144</p>
</item>
<item>
<p>
Introduce <c>os:getenv/2</c> which is similar to
<c>os:getenv/1</c> but returns the passed default value
if the required environment variable is undefined.</p>
<p>
Own Id: OTP-12342</p>
</item>
<item>
<p>
It is now possible to paste text in JCL mode (using
Ctrl-Y) that has been copied in the previous shell
session. Also a bug that caused the JCL mode to crash
when pasting text has been fixed.</p>
<p>
Own Id: OTP-12673</p>
</item>
<item>
<p>
Ensure that each segment of an IPv6 address when parsed
from a string has a maximum of 4 hex digits</p>
<p>
Own Id: OTP-12773</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
New BIF: <c>erlang:get_keys/0</c>, lists all keys
associated with the process dictionary. Note:
<c>erlang:get_keys/0</c> is auto-imported.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-12151 Aux Id: seq12521 </p>
</item>
<item>
<p>
The internal group to user_drv protocol has been changed
to be synchronous in order to guarantee that output sent
to a process implementing the user_drv protocol is
printed before replying. This protocol is used by the
standard_output device and the ssh application when
acting as a client. </p>
<p>
This change changes the previous unlimited buffer when
printing to standard_io and other devices that end up in
user_drv to 1KB.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-12240</p>
</item>
<item>
<p>The <c>inflateInit/2</c> and <c>deflateInit/6</c>
functions now accepts a WindowBits argument equal to 8
and -8.</p>
<p>
Own Id: OTP-12564</p>
</item>
<item>
<p>
Map error logger warnings to warning messages by default.</p>
<p>
Own Id: OTP-12755</p>
</item>
<item>
<p>
Map beam error logger warnings to warning messages by
default. Previously these messages were mapped to the
error channel by default.</p>
<p>
Own Id: OTP-12781</p>
</item>
<item>
<p>
gen_tcp:shutdown/2 is now asynchronous</p>
<p>
This solves the following problems with the old
implementation:</p>
<p>
It doesn't block when the TCP peer is idle or slow. This
is the expected behaviour when shutdown() is called: the
caller needs to be able to continue reading from the
socket, not be prevented from doing so.</p>
<p>
It doesn't truncate the output. The current version of
gen_tcp:shutdown/2 will truncate any outbound data in the
driver queue after about 10 seconds if the TCP peer is
idle of slow. Worse yet, it doesn't even inform anyone
that the data has been truncated: 'ok' is returned to the
caller; and a FIN rather than an RST is sent to the TCP
peer.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-12797</p>
</item>
<item>
<p>
There are many cases where user code needs to be able to
distinguish between a socket that was closed normally and
one that was aborted. Setting the option
{show_econnreset, true} enables the user to receive
ECONNRESET errors on both active and passive sockets.</p>
<p>
Own Id: OTP-12843</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 3.2.0.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>The 'raw' socket option could not be used multiple times
in one call to any e.g gen_tcp function because only one
of the occurrences were used. This bug has been fixed,
and also a small bug concerning propagating error codes
from within inet:setopts/2.</p>
<p>Own Id: OTP-11482 Aux Id: seq12872 </p>
</item>
</list>
</section>
</section>
<section><title>Kernel 3.2</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
A bug causing an infinite loop in hostname resolving has
been corrected. To trigger this bug you would have to
enter an bogus search method from a configuration file
e.g .inetrc.</p>
<p>
Bug pinpointed by Emil Holmström</p>
<p>
Own Id: OTP-12133</p>
</item>
<item>
<p>
The standard_error process now handles the getopts I/O
protocol request correctly and stores its encoding in the
same way as standard_io.</p>
<p>
Also, io:put_chars(standard_error, [oops]) could
previously crash the standard_error process. This is now
corrected.</p>
<p>
Own Id: OTP-12424</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
Configuration parameters for the Kernel application that
allows setting socket options for the distribution
sockets have been added. See the application Kernel
documentation; parameters 'inet_dist_listen_options' and
'inet_dist_connect_options'.</p>
<p>
Own Id: OTP-12476 Aux Id: OTP-12476 </p>
</item>
</list>
</section>
</section>
<section><title>Kernel 3.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Make sure to install .hrl files when needed</p>
<p>
Own Id: OTP-12197</p>
</item>
<item>
<p>
Removed the undocumented application environment variable
'raw_files' from the kernel application. This variable
was checked (by call to application:get_env/2) each time
a raw file was to be opened in the file module.</p>
<p>
Own Id: OTP-12276</p>
</item>
<item>
<p>
A bug has been fixed when using the netns option to
gen_udp, which accidentally only worked if it was the
last option.</p>
<p>
Own Id: OTP-12314</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
Updated documentation for inet buffer size options.</p>
<p>
Own Id: OTP-12296</p>
</item>
<item>
<p>
Introduce new option 'raw' in file_info and link_info
functions. This option allows the caller not to go
through the file server for information about files
guaranteed to be local.</p>
<p>
Own Id: OTP-12325</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 3.0.3</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Accept inet:ip_address() in net_adm:names/1</p>
<p>
Own Id: OTP-12154</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 3.0.2</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
OTP-11850 fixed filelib:wildcard/1 to work with broken
symlinks. This correction, however, introduced problems
since symlinks were no longer followed for functions like
filelib:ensure_dir/1, filelib:is_dir/1,
filelib:file_size/1, etc. This is now corrected.</p>
<p>
Own Id: OTP-12054 Aux Id: seq12660 </p>
</item>
</list>
</section>
</section>
<section><title>Kernel 3.0.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
If the Config given to
application_controller:change_application_data included
other config files, it was only expanded for already
existing (loaded) applications. If an upgrade added a new
application which had config data in an included config
file, the new application did not get correct config
data.</p>
<p>
This is now changed so config data will be expanded for
all applications.</p>
<p>
Own Id: OTP-11864</p>
</item>
<item>
<p>It was allowed to re-load pre-loaded modules such as
<c>erlang</c>, but that could cause strange and unwanted
things to happen, such as call <c>apply/3</c> to loop.
Pre-loaded modules are now sticky by default. (Thanks to
Loïc Hoguin for reporting this bug.)</p>
<p><c>code:add_path("/ending/in/slash/")</c> removes the
trailing slash, adding <c>/ending/in/slash</c> to the
code path. However,
<c>code:del_path("/ending/in/slash/")</c> would fail to
remove the path since it did not remove the trailing
slash. This has been fixed.</p>
<p>
Own Id: OTP-11913</p>
</item>
<item>
<p>
Fix erts_debug:size/1 to handle Map sizes</p>
<p>
Own Id: OTP-11923</p>
</item>
<item>
<p>The documentation for <c>file:file_info/1</c> has been
removed. The function itself was removed a long time
ago.</p>
<p>
Own Id: OTP-11982</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 3.0</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Fixed a deadlock possibility in terminate application</p>
<p>
Own Id: OTP-11171</p>
</item>
<item>
<p>
Fixed bug where sendfile would return the wrong error
code for a remotely closed socket if the socket was in
passive mode. (Thanks to Vincent Siliakus for reporting
the bug.)</p>
<p>
Own Id: OTP-11614</p>
</item>
<item>
<p>
The new option <c>persistent</c> is added to
<c>application:set_env/4</c> and
<c>application:unset_env/3</c>. An environment key set
with the <c>persistent</c> option will not be overridden
by the ones configured in the application resource file
on load. This means persistent values will stick after
the application is loaded and also on application reload.
(Thanks to José Valim)</p>
<p>
Own Id: OTP-11708</p>
</item>
<item>
<p>
The spec for file:set_cwd/1 is modified to also accept
binaries as arguments. This has always been allowed in
the code, but it was not reflected in the spec since
binaries are mostly used for raw file names. Raw file
names are names that are not encoded according to
file:native_name_encoding(), and these are not allowed in
file:set_cwd/1. The spec is now, however, more allowing
in order to avoid unnecessary dialyzer warnings. Raw file
names will still fail in runtime with reason
'no_translation'. (Thanks to José Valim)</p>
<p>
Own Id: OTP-11787</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
heart:set_cmd/1 is updated to allow unicode code points >
255 in the given heart command</p>
<p>
Own Id: OTP-10843</p>
</item>
<item>
<p> Dialyzer's <c>unmatched_return</c> warnings have been
corrected. </p>
<p>
Own Id: OTP-10908</p>
</item>
<item>
<p>
Make erlang:open_port/2 spawn and spawn_executable handle
unicode.</p>
<p>
Own Id: OTP-11105</p>
</item>
<item>
<p>
Erlang/OTP has been ported to the realtime operating
system OSE. The port supports both smp and non-smp
emulator. For details around the port and how to started
see the User's Guide in the ose application. </p>
<p>
Note that not all parts of Erlang/OTP has been ported. </p>
<p>
Notable things that work are: non-smp and smp emulators,
OSE signal interaction, crypto, asn1, run_erl/to_erl,
tcp, epmd, distribution and most if not all non-os
specific functionality of Erlang.</p>
<p>
Notable things that does not work are: udp/sctp, os_mon,
erl_interface, binding of schedulers.</p>
<p>
Own Id: OTP-11334</p>
</item>
<item>
<p>
Add the {active,N} socket option for TCP, UDP, and SCTP,
where N is an integer in the range -32768..32767, to
allow a caller to specify the number of data messages to
be delivered to the controlling process. Once the
socket's delivered message count either reaches 0 or is
explicitly set to 0 with inet:setopts/2 or by including
{active,0} as an option when the socket is created, the
socket transitions to passive ({active, false}) mode and
the socket's controlling process receives a message to
inform it of the transition. TCP sockets receive
{tcp_passive,Socket}, UDP sockets receive
{udp_passive,Socket} and SCTP sockets receive
{sctp_passive,Socket}. </p>
<p>
The socket's delivered message counter defaults to 0, but
it can be set using {active,N} via any gen_tcp, gen_udp,
or gen_sctp function that takes socket options as
arguments, or via inet:setopts/2. New N values are added
to the socket's current counter value, and negative
numbers can be used to reduce the counter value.
Specifying a number that would cause the socket's counter
value to go above 32767 causes an einval error. If a
negative number is specified such that the counter value
would become negative, the socket's counter value is set
to 0 and the socket transitions to passive mode. If the
counter value is already 0 and inet:setopts(Socket,
[{active,0}]) is specified, the counter value remains at
0 but the appropriate passive mode transition message is
generated for the socket.</p>
<p>
Thanks to Steve Vinoski</p>
<p>
Own Id: OTP-11368</p>
</item>
<item>
<p>
A call to either the <c>garbage_collect/1</c> BIF or the
<c>check_process_code/2</c> BIF may trigger garbage
collection of another processes than the process calling
the BIF. The previous implementations performed these
kinds of garbage collections without considering the
internal state of the process being garbage collected. In
order to be able to more easily and more efficiently
implement yielding native code, these types of garbage
collections have been rewritten. A garbage collection
like this is now triggered by an asynchronous request
signal, the actual garbage collection is performed by the
process being garbage collected itself, and finalized by
a reply signal to the process issuing the request. Using
this approach processes can disable garbage collection
and yield without having to set up the heap in a state
that can be garbage collected.</p>
<p>
The <seealso
marker="erts:erlang#garbage_collect/2"><c>garbage_collect/2</c></seealso>,
and <seealso
marker="erts:erlang#check_process_code/3"><c>check_process_code/3</c></seealso>
BIFs have been introduced. Both taking an option list as
last argument. Using these, one can issue asynchronous
requests.</p>
<p>
<c>code:purge/1</c> and <c>code:soft_purge/1</c> have
been rewritten to utilize asynchronous
<c>check_process_code</c> requests in order to
parallelize work.</p>
<p>
Characteristics impact: A call to the
<c>garbage_collect/1</c> BIF or the
<c>check_process_code/2</c> BIF will normally take longer
time to complete while the system as a whole wont be as
much negatively effected by the operation as before. A
call to <c>code:purge/1</c> and <c>code:soft_purge/1</c>
may complete faster or slower depending on the state of
the system while the system as a whole wont be as much
negatively effected by the operation as before.</p>
<p>
Own Id: OTP-11388 Aux Id: OTP-11535, OTP-11648 </p>
</item>
<item>
<p>
Add sync option to file:open/2.</p>
<p>
The sync option adds the POSIX O_SYNC flag to the open
system call on platforms that support the flag or its
equivalent, e.g., FILE_FLAG_WRITE_THROUGH on Windows. For
platforms that don't support it, file:open/2 returns
{error, enotsup} if the sync option is passed in. Thank
to Steve Vinoski and Joseph Blomstedt</p>
<p>
Own Id: OTP-11498</p>
</item>
<item>
<p> The contract of <c>inet:ntoa/1</c> has been
corrected. </p> <p> Thanks to Max Treskin. </p>
<p>
Own Id: OTP-11730</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.16.4.1</title>
<section><title>Known Bugs and Problems</title>
<list>
<item>
<p>
When using gen_tcp:connect and the <c>fd</c> option with
<c>port</c> and/or <c>ip</c>, the <c>port</c> and
<c>ip</c> options were ignored. This has been fixed so
that if <c>port</c> and/or <c>ip</c> is specified
together with <c>fd</c> a bind is requested for that
<c>fd</c>. If <c>port</c> and/or <c>ip</c> is not
specified bind will not be called.</p>
<p>
Own Id: OTP-12061</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.16.4</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Fix the typespec for the inet:ifget/2 and inet:ifget/3
return value. Thanks to Ali Sabil.</p>
<p>
Own Id: OTP-11377</p>
</item>
<item>
<p>
Fix various typos in erts, kernel and ssh. Thanks to
Martin Hässler.</p>
<p>
Own Id: OTP-11414</p>
</item>
<item>
<p>
Fix rpc multicall sample code. Thanks to Edwin Fine.</p>
<p>
Own Id: OTP-11471</p>
</item>
<item>
<p>
Under rare circumstances a process calling <seealso
marker="kernel:inet#close/1"><c>inet:close/1</c></seealso>,
<seealso
marker="kernel:gen_tcp#close/1"><c>gen_tcp:close/1</c></seealso>,
<seealso
marker="kernel:gen_udp#close/1"><c>gen_udp:close/1</c></seealso>,
or <seealso
marker="kernel:gen_sctp#close/1"><c>gen_sctp:close/1</c></seealso>
could hang in the call indefinitely.</p>
<p>
Own Id: OTP-11491</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
Add more SCTP errors as described in RFC 4960. Thanks to
Artem Teslenko.</p>
<p>
Own Id: OTP-11379</p>
</item>
<item>
<p>
Add new BIF os:unsetenv/1 which deletes an environment
variable. Thanks to Martin Hässler.</p>
<p>
Own Id: OTP-11446</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.16.3</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Fix indentation of User switch command help in Erlang
shell. Thanks to Sylvain Benner.</p>
<p>
Own Id: OTP-11209</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
The previous undocumented function ntoa/1 has been added
to inet docs and exported in the inet module.</p>
<p>
Own Id: OTP-10676 Aux Id: OTP-10314 </p>
</item>
<item>
<p>
Fix typo in abcast() function comment. Thanks to Johannes
Weissl.</p>
<p>
Own Id: OTP-11219</p>
</item>
<item>
<p>
Add application:ensure_all_started/1-2. Thanks to Fred
Hebert.</p>
<p>
Own Id: OTP-11250</p>
</item>
<item>
<p>
Make edlin understand a few important control keys.
Thanks to Stefan Zegenhagen.</p>
<p>
Own Id: OTP-11251</p>
</item>
<item>
<p>
Cleanup of hipe_unified_loader, eliminating uses of
is_subtype/2 in specs, change module-local void functions
to return 'ok' instead of [] and made sure there are no
dialyzer warnings with --Wunmatched_returns. Thanks to
Kostis Sagonas.</p>
<p>
Own Id: OTP-11301</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.16.2</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
A bug in prim_inet has been corrected. If the port owner
was killed at a bad time while closing the socket port
the port could become orphaned hence causing port and
socket leaking. Reported by Fred Herbert, Dmitry Belyaev
and others.</p>
<p>
Own Id: OTP-10497 Aux Id: OTP-10562 </p>
</item>
<item>
<p>
A few bugs regarding case sensitivity for hostname
resolution while using e.g the internal lookup types
'file' and 'dns' has been corrected. When looking up
hostnames ASCII letters a-z are to be regarded as the
same as A-Z according to RFC 4343 "Domain Name System
(DNS) Case Insensitivity Clarification", and this was not
always the case.</p>
<p>
Own Id: OTP-10689 Aux Id: seq12227 </p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
Add <c>application:ensure_started/1,2</c>. It is
equivavlent to <c>application:start/1,2</c> except it
returns <c>ok</c> for already started applications.</p>
<p>
Own Id: OTP-10910</p>
</item>
<item>
<p>
Optimize communication with file io server. Thanks to
Anthony Ramine.</p>
<p>
Own Id: OTP-11040</p>
</item>
<item>
<p>Erlang source files with non-ASCII characters are now
encoded in UTF-8 (instead of latin1).</p>
<p>
Own Id: OTP-11041 Aux Id: OTP-10907 </p>
</item>
<item>
<p>
Optimization of simultaneous <c>inet_db</c> operations on
the same socket by using a lock free implementation.</p>
<p>
Impact on the characteristics of the system: Improved
performance.</p>
<p>
Own Id: OTP-11074</p>
</item>
<item>
<p>
The <c>high_msgq_watermark</c> and
<c>low_msgq_watermark</c> <c>inet</c> socket options
introduced in OTP-R16A could only be set on TCP sockets.
These options are now generic and can be set on all types
of sockets.</p>
<p>
Own Id: OTP-11075 Aux Id: OTP-10336 </p>
</item>
<item>
<p>
Fix deep list argument error under Windows in os:cmd/1.
Thanks to Aleksandr Vinokurov .</p>
<p>
Own Id: OTP-11104</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.16.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p> A bug that could cause a crash with wrong reason has
been corrected in the <c>application_controller</c>
module. </p>
<p>
Own Id: OTP-10754</p>
</item>
<item>
<p>
Fix <c>code:is_module_native/1</c> that sometimes in R16A
returned false for hipe compiled modules containing BIFs
such as <c>lists</c>.</p>
<p>
Own Id: OTP-10870</p>
</item>
<item>
<p>
Respect <c>{exit_on_close,false}</c> option on tcp socket
in non-passive mode when receiving fails (due to an
ill-formed packet for example) by only doing a half close
and still allow sending on the socket. (Thanks to Anthony
Molinaro and Steve Vinoski for reporting the problem)</p>
<p>
Own Id: OTP-10879</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
Slightly nicer error message when node start fails due to
duplicate name. Thanks to Magnus Henoch.</p>
<p>
Own Id: OTP-10797</p>
</item>
<item>
<p> Miscellaneous updates due to Unicode support. </p>
<p>
Own Id: OTP-10820</p>
</item>
<item>
<p>
Add a new function code:get_mode() can be used to detect
how the code servers behaves. Thanks to Vlad Dumitrescu</p>
<p>
Own Id: OTP-10823</p>
</item>
<item>
<p>
Fix type of error Reason on gen_tcp:send/2. Thanks to
Sean Cribbs.</p>
<p>
Own Id: OTP-10839</p>
</item>
<item>
<p><c>file:list_dir_all/1</c> and
<c>file:read_link_all/1</c> that can handle raw file
names have been added. See the User Guide for STDLIB for
information about raw file names.</p>
<p>
Own Id: OTP-10852</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.16</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
It is no longer possible to have <c>{Mod,Vsn}</c> in the
'modules' list in a .app file.</p>
<p>
This was earlier possible, although never documented in
the .app file reference manual. It was however visible in
the documentation of <c>application:load/[1,2]</c>, where
the same term as in a .app file can be used as the first
argument.</p>
<p>
The possibility has been removed since the <c>Vsn</c>
part was never used.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-10417</p>
</item>
<item>
<p> The contract of <c>erl_ddll:format_error/1</c> has
been corrected. (Thanks to Joseph Wayne Norton.) </p>
<p>
Own Id: OTP-10473</p>
</item>
<item>
<p>
Change printout of application crash message on startup
to formated strings (Thanks to Serge Aleynikov)</p>
<p>
Own Id: OTP-10620</p>
</item>
<item>
<p> The type <c>ascii_string()</c> in the <c>base64</c>
module has been corrected. The type
<c>file:file_info()</c> has been cleaned up. The type
<c>file:fd()</c> has been made opaque in the
documentation. </p>
<p>
Own Id: OTP-10624 Aux Id: kunagi-352 [263] </p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
Inet exported functionality</p>
<p>
inet:parse_ipv4_address/1,
inet:parse_ipv4strict_address/1,
inet:parse_ipv6_address/1,
inet:parse_ipv6strict_address/1, inet:parse_address/1 and
inet:parse_strict_address is now exported from the inet
module.</p>
<p>
Own Id: OTP-8067 Aux Id: kunagi-274 [185] </p>
</item>
<item>
<p>
A boolean socket option 'ipv6_v6only' for IPv6 sockets
has been added. The default value of the option is OS
dependent, so applications aiming to be portable should
consider using <c>{ipv6_v6only,true}</c> when creating an
<c>inet6</c> listening/destination socket, and if
necessary also create an <c>inet</c> socket on the same
port for IPv4 traffic. See the documentation.</p>
<p>
Own Id: OTP-8928 Aux Id: kunagi-193 [104] </p>
</item>
<item>
<p> Support for Unicode has been implemented. </p>
<p>
Own Id: OTP-10302</p>
</item>
<item>
<p>
The documentation for <c>global:register_name/3</c> has
been updated to mention that the use of
<c>{Module,Function}</c> as the method argument (resolve
function) is deprecated.</p>
<p>
Own Id: OTP-10419</p>
</item>
<item>
<p>
Fixed bug where sendfile on oracle solaris would return
an error when a partial send was done.</p>
<p>
Own Id: OTP-10549</p>
</item>
<item>
<p>
The <c>error_handler</c> module will now call
<c>'$handle_undefined_function'/2</c> if an attempt is
made to call a non-existing function in a module that
exists. See the documentation for <c>error_handler</c>
module for details.</p>
<p>
Own Id: OTP-10617 Aux Id: kunagi-340 [251] </p>
</item>
<item>
<p>Where necessary a comment stating encoding has been
added to Erlang files. The comment is meant to be removed
in Erlang/OTP R17B when UTF-8 becomes the default
encoding. </p>
<p>
Own Id: OTP-10630</p>
</item>
<item>
<p>
Do not return wrong terms unnecessarily. (Thanks to
Kostis Sagonas.)</p>
<p>
Own Id: OTP-10662</p>
</item>
<item>
<p> Some examples overflowing the width of PDF pages have
been corrected. </p>
<p>
Own Id: OTP-10665</p>
</item>
<item>
<p>Add file:allocate/3 operation</p>
<p>This operation allows pre-allocation of space for
files. It succeeds only on systems that support such
operation. (Thanks to Filipe David Manana)</p>
<p>
Own Id: OTP-10680</p>
</item>
<item>
<p>
Add application:get_key/3. The new function provides a
default value for a configuration parameter. Thanks to
Serge Aleynikov.</p>
<p>
Own Id: OTP-10694</p>
</item>
<item>
<p>
Add search to Erlang shell's history. Thanks to Fred
Herbert.</p>
<p>
Own Id: OTP-10739</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.15.3</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Ensure 'erl_crash.dump' when asked for it. This will
change erl_crash.dump behaviour.</p>
<p>
* Not setting ERL_CRASH_DUMP_SECONDS will now terminate
beam immediately on a crash without writing a crash dump
file.</p>
<p>
* Setting ERL_CRASH_DUMP_SECONDS to 0 will also terminate
beam immediately on a crash without writing a crash dump
file, i.e. same as not setting ERL_CRASH_DUMP_SECONDS
environment variable.</p>
<p>
* Setting ERL_CRASH_DUMP_SECONDS to a negative value will
let the beam wait indefinitely on the crash dump file
being written.</p>
<p>
* Setting ERL_CRASH_DUMP_SECONDS to a positive value will
let the beam wait that many seconds on the crash dump
file being written.</p>
<p>
A positive value will set an alarm/timeout for restart
both in beam and in heart if heart is running.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-10422 Aux Id: kunagi-250 [161] </p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.15.2</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Fixed issue where using controlling_process/2 with self()
as the second argument caused the port to leak if self()
crashes. (Thanks to Ricardo Catalinas Jiménez)</p>
<p>
Own Id: OTP-10094</p>
</item>
<item>
<p>
When sending large files using the file:sendfile fallback
file:sendfile would crash. This is now fixed.</p>
<p>
Own Id: OTP-10098</p>
</item>
<item>
<p>
Fix rpc:call/5 for local calls with a finite Timeout
(Thanks to Tomer Chachamu)</p>
<p>
Own Id: OTP-10149</p>
</item>
<item>
<p>
fix escript/primary archive reloading</p>
<p>
If the mtime of an escript/primary archive file changes
after being added to the code path, correctly reload the
archive and update the cache. (Thanks to Tuncer Ayaz)</p>
<p>
Own Id: OTP-10151</p>
</item>
<item>
<p>
Support added for home directories named with non-ASCII
characters (codepoints above 127) on a system running in
Unicode file mode (e.g. on MacOSX or Linux with startup
arguments +fnu or +fna with the right LOCALE). Also
environment variables with Unicode content are supported
in applicable environments.</p>
<p>
Own Id: OTP-10160</p>
</item>
<item>
<p>
Allow mixed IPv4 and IPv6 addresses to sctp_bindx</p>
<p>
Also allow mixed address families to bind, since the
first address on a multihomed sctp socket must be bound
with bind, while the rest are to be bound using
sctp_bindx. At least Linux supports adding address of
mixing families. Make inet_set_faddress function
available also when HAVE_SCTP is not defined, since we
use it to find an address for bind to be able to mix ipv4
and ipv6 addresses. Thanks to Tomas Abrahamsson</p>
<p>
Own Id: OTP-10217</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>Document inet options: high_watermark, priority,
linger and a some other options that previously was
undocumented.</p>
<p>
Own Id: OTP-10053</p>
</item>
<item>
<p>Remove bit8 option support from inet</p>
<p>
Own Id: OTP-10056</p>
</item>
<item>
<p> The type of the disk log header has been corrected.
(Thanks to Niclas Eklund.) </p>
<p>
Own Id: OTP-10131</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.15.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Driver output has been corrected so output of large
binaries (> 4 GiB) now does not silently fail or crash
the emulator, but either outputs the binary or fails the
call. This means that writing a binary > 4 Gib to file
now works but on e.g 64-bit Windows (that has
scatter/gather I/O buffer segment lengths of 32 bits)
fails. The behaviour may change in the future to always
write the binary, in parts if necessary.</p>
<p>
Own Id: OTP-9820 Aux Id: OTP-9795 </p>
</item>
<item>
<p>
erts: minor fix for unnecessary condition erts: change
SENDFILE_CHUNK_SIZE from signed to unsigned (Thanks to
jovi zhang)</p>
<p>
Own Id: OTP-9872</p>
</item>
<item>
<p> Two contracts in <c>gen_sctp</c> have been corrected.
</p>
<p>
Own Id: OTP-9874</p>
</item>
<item>
<p>If a process calls a module with an running on_load
handler, the process is supposed to be suspended. But if
the module with the on_load handler was loading used
<c>code:load_binary/3</c>, the call would instead fail
with an <c>undef</c> exception.</p>
<p>
Own Id: OTP-9875</p>
</item>
<item>
<p>
File name and error reason is now returned if creation of
a cookie fails. (Thanks to Magnus Henoch)</p>
<p>
Own Id: OTP-9954</p>
</item>
<item>
<p>
Fix port leak in <c>zlib</c> when passing invalid data to
<c>compress,uncompress,zip,unzip,gzip,gunzip</c>.</p>
<p>
Own Id: OTP-9981</p>
</item>
<item>
<p>
Various typographical errors corrected in documentation
for the global, error_logger, etop, lists, ets and
supervisor modules and in the c_portdriver and kernel_app
documentation. (Thanks to Ricardo Catalinas Jiménez)</p>
<p>
Own Id: OTP-9987</p>
</item>
<item>
<p> Fix returned error from gen_tcp:accept/1,2 when
running out of ports.</p>
<p>
The {error, enfile} return value is badly misleading and
confusing for this case, since the Posix ENFILE errno
value has a well-defined meaning that has nothing to do
with Erlang ports. The fix changes the return value to
{error, system_limit}, which is consistent with e.g.
various file(3) functions. inet:format_error/1 has also
been updated to support system_limit in the same manner
as file:format_error/1. (Thanks to Per Hedeland)</p>
<p>
Own Id: OTP-9990</p>
</item>
<item>
<p><c>erts_debug:size/1</c> has been corrected to take
sharing in the environment of funs into account. For funs
it used to always give the same result as
<c>erts_debug:flat_size/1</c>.</p>
<p>
Own Id: OTP-9991</p>
</item>
<item>
<p>
In some cases when the process doing file:sendfile
crashes while sending the file the efile_drv code would
not clean up after itself correctly. This has now been
fixed.</p>
<p>
Own Id: OTP-9993</p>
</item>
<item>
<p>
On BSD based platforms file:sendfile would sometime go
into an infinite loop when sending big files. This has
now been fixed.</p>
<p>
Own Id: OTP-9994</p>
</item>
<item>
<p>While <c>disk_log</c> eagerly collects logged terms
for better performance, collecting too much data may
choke the system and cause huge binaries to be
written.</p>
<p>The problem was addressed in OTP-9764, but the
situation was not improved in all cases.</p>
<p>(Thanks to Richard Carlsson.)</p>
<p>
Own Id: OTP-9999 Aux Id: OTP-9764 </p>
</item>
<item>
<p>
The documentation of .app files incorrectly said that the
default value for the <c>mod</c> parameter is
<c>undefined</c>. This is now corrected to <c>[]</c>.</p>
<p>
Own Id: OTP-10002</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.15</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p> Calls to <c>global:whereis_name/1</c> have been
substituted for calls to
<c>global:safe_whereis_name/1</c> since the latter is not
safe at all.</p>
<p>The reason for not doing this earlier is that setting
a global lock masked out a bug concerning the restart of
supervised children. The bug has now been fixed by a
modification of <c>global:whereis_name/1</c>. (Thanks to
Ulf Wiger for code contribution.)</p>
<p>A minor race conditions in <c>gen_fsm:start*</c> has
been fixed: if one of these functions returned <c>{error,
Reason}</c> or ignore, the name could still be registered
(either locally or in <c>global</c>. (This is the same
modification as was done for gen_server in OTP-7669.)</p>
<p>The undocumented function
<c>global:safe_whereis_name/1</c> has been removed. </p>
<p>
Own Id: OTP-9212 Aux Id: seq7117, OTP-4174 </p>
</item>
<item>
<p>
Honor option <c>packet_size</c> for http packet parsing
by both TCP socket and <c>erlang:decode_packet</c>. This
gives the ability to accept HTTP headers larger than the
default setting, but also avoid DoS attacks by accepting
lines only up to whatever length you wish to allow. For
consistency, packet type <c>line</c> also honor option
<c>packet_size</c>. (Thanks to Steve Vinoski)</p>
<p>
Own Id: OTP-9389</p>
</item>
<item>
<p> <c>disk_log:reopen/2,3</c> and
<c>disk_log:breopen/3</c> could return the error reason
from <c>file:rename/2</c> rather than the reason
<c>{file_error, Filename, Reason}</c>. This bug has been
fixed. </p> <p> The message <c>{disk_log, Node, {error,
disk_log_stopped}}</c> which according the documentation
is sent upon failure to truncate or reopen a disk log was
sometimes turned into a reply. This bug has been fixed.
</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-9508</p>
</item>
<item>
<p>
Environment variable 'shutdown_timeout' is added to
kernel application. Earlier, application_controller would
hang forever if an application top supervisor did not
terminate upon a shutdown request. If this new
environment variable is set to a positive integer T, then
application controller will now give up after T
milliseconds and instead brutally kill the application.
For backwards compatibility, the default value for
shutdown_timeout is 'infinity'.</p>
<p>
Own Id: OTP-9540</p>
</item>
<item>
<p>
Add '-callback' attributes in stdlib's behaviours</p>
<p>
Replace the behaviour_info(callbacks) export in stdlib's
behaviours with -callback' attributes for all the
callbacks. Update the documentation with information on
the callback attribute Automatically generate
'behaviour_info' function from '-callback' attributes</p>
<p>
'behaviour_info(callbacks)' is a special function that is
defined in a module which describes a behaviour and
returns a list of its callbacks.</p>
<p>
This function is now automatically generated using the
'-callback' specs. An error is returned by lint if user
defines both '-callback' attributes and the
behaviour_info/1 function. If no type info is needed for
a callback use a generic spec for it. Add '-callback'
attribute to language syntax</p>
<p>
Behaviours may define specs for their callbacks using the
familiar spec syntax, replacing the '-spec' keyword with
'-callback'. Simple lint checks are performed to ensure
that no callbacks are defined twice and all types
referred are declared.</p>
<p>
These attributes can be then used by tools to provide
documentation to the behaviour or find discrepancies in
the callback definitions in the callback module.</p>
<p>
Add callback specs into 'application' module in kernel
Add callback specs to tftp module following internet
documentation Add callback specs to inets_service module
following possibly deprecated comments</p>
<p>
Own Id: OTP-9621</p>
</item>
<item>
<p>
make tab completion work in remote shells (Thanks to Mats
Cronqvist)</p>
<p>
Own Id: OTP-9673</p>
</item>
<item>
<p>
Add missing parenthesis in heart doc.</p>
<p>
Add missing spaces in the Reference Manual distributed
section.</p>
<p>
In the HTML version of the doc those spaces are necessary
to separate those words.</p>
<p>
Own Id: OTP-9693</p>
</item>
<item>
<p>
Fixes net_kernel:get_net_ticktime() doc</p>
<p>
Adds missing description when `ignored' is returned.
(Thanks to Ricardo Catalinas Jiménez )</p>
<p>
Own Id: OTP-9713</p>
</item>
<item>
<p> While <c>disk_log</c> eagerly collects logged terms
for better performance, collecting too much data may
choke the system and cause huge binaries to be written.
In order to remedy the situation a (small) limit on the
amount of data that is collected before writing to disk
has been introduced. </p>
<p>
Own Id: OTP-9764</p>
</item>
<item>
<list> <item><p>Correct callback spec in application
module</p></item> <item><p>Refine warning about callback
specs with extra ranges</p></item> <item><p>Cleanup
autoimport compiler directives</p></item> <item><p>Fix
Dialyzer's warnings in typer</p></item> <item><p>Fix
Dialyzer's warning for its own code</p></item>
<item><p>Fix bug in Dialyzer's behaviours
analysis</p></item> <item><p>Fix crash in
Dialyzer</p></item> <item><p>Variable substitution was
not generalizing any unknown variables.</p></item>
</list>
<p>
Own Id: OTP-9776</p>
</item>
<item>
<p>
Fix a crash when file:change_time/2,3 are called with
invalid dates</p>
<p>
Calling file:change_time/2,3 with an invalid date tuple
(e.g file:change_time("file.txt", {undefined,
undefined})) will cause file_server_2 to crash.
error_logger will shutdown and the whole VM will stop.
Change behavior to validate given dates on system
boundaries. (i.e before issuing a server call).(Thanks to
Ahmed Omar)</p>
<p>
Own Id: OTP-9785</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p> An option list argument can now be passed to
<c>file:read_file_info/2, file:read_link_info/2</c> and
<c>file:write_file_info/3</c> and set time type
information in the call. Valid options are <c>{time,
local}, {time, universal}</c> and <c>{time, posix}</c>.
In the case of <c>posix</c> time no conversions are made
which makes the operation a bit faster. </p>
<p>
Own Id: OTP-7687</p>
</item>
<item>
<p><c>file:list_dir/1,2</c> will now fill an buffer
entire with filenames from the efile driver before
sending it to an erlang process. This will speed up this
file operation in most cases.</p>
<p>
Own Id: OTP-9023</p>
</item>
<item>
<p>gen_sctp:open/0-2 may now return
{error,eprotonosupport} if SCTP is not supported</p>
<p>gen_sctp:peeloff/1 has been implemented and creates a
one-to-one socket which also are supported now</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-9239</p>
</item>
<item>
<p>
Sendfile has been added to the file module's API.
sendfile/2 is used to read data from a file and send it
to a tcp socket using a zero copying mechanism if
available on that OS.</p>
<p>
Thanks to Tuncer Ayaz and Steve Vinovski for original
implementation</p>
<p>
Own Id: OTP-9240</p>
</item>
<item>
<p>
Tuple funs (a two-element tuple with a module name and a
function) are now officially deprecated and will be
removed in R16. Use '<c>fun M:F/A</c>' instead. To make
you aware that your system uses tuple funs, the very
first time a tuple fun is applied, a warning will be sent
to the error logger.</p>
<p>
Own Id: OTP-9649</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.14.5</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Fix type of Packet arg of gen_tcp:send/2 and
gen_udp:send/4</p>
<p>
The type is marked as a binary() or a string() but in
practice it can be an iodata(). The test suite was
updated to confirm the gen_tcp/2 and gen_udp:send/4
functions accept iodata() (iolists) packets. (Thanks to
Filipe David Manana)</p>
<p>
Own Id: OTP-9514</p>
</item>
<item>
<p> XML files have been corrected. </p>
<p>
Own Id: OTP-9550 Aux Id: OTP-9541 </p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p> The types and specifications of the inet modules have
been improved. </p>
<p>
Own Id: OTP-9260</p>
</item>
<item>
<p> Types and specifications have been added. </p>
<p>
Own Id: OTP-9356</p>
</item>
<item>
<p> Contracts in STDLIB and Kernel have been improved and
type errors have been corrected. </p>
<p>
Own Id: OTP-9485</p>
</item>
<item>
<p> Update documentation and specifications of some of
the zlib functions. </p>
<p>
Own Id: OTP-9506</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.14.4</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
The send_timeout option in gen_tcp did not work properly
in active mode or with {active,once} options. This is now
corrected.</p>
<p>
Own Id: OTP-9145</p>
</item>
<item>
<p>
Fixed various typos across the documentation (Thanks to
Tuncer Ayaz)</p>
<p>
Own Id: OTP-9154</p>
</item>
<item>
<p>
Fix typo in doc of rpc:pmap/3 (Thanks to Ricardo
Catalinas Jiménez)</p>
<p>
Own Id: OTP-9168</p>
</item>
<item>
<p>
A bug in inet_res, the specialized DNS resolver, has been
corrected. A late answer with unfortunate timing could
cause a runtime exception. Some code cleanup and
improvements also tagged along. Thanks to Evegeniy
Khramtsov for a pinpointing bug report and bug fix
testing.</p>
<p>
Own Id: OTP-9221 Aux Id: OTP-8712 </p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p> Types and specifications have been added. </p>
<p>
Own Id: OTP-9268</p>
</item>
<item>
<p> Erlang types and specifications are used for
documentation. </p>
<p>
Own Id: OTP-9272</p>
</item>
<item>
<p> Two opaque types that could cause warnings when
running Dialyzer have been modified. </p>
<p>
Own Id: OTP-9337</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.14.3</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
<c>os:find_executable/{1,2}</c> will no longer return the
path of a directory that happens to be in the PATH.</p>
<p>
Own Id: OTP-8983 Aux Id: seq11749 </p>
</item>
<item>
<p>
Fix -spec for file:write_file/3</p>
<p>
Change type for second parameter from binary() to
iodata(), since the function explicitly takes steps to
accept lists as well as binaries. (thanks to Magnus
Henoch).</p>
<p>
Own Id: OTP-9067</p>
</item>
<item>
<p>
Sanitize the specs of the code module</p>
<p>
After the addition of unicode_binary() to the
file:filename() type, dialyzer started complaining about
erroneous or incomplete specs in some functions of the
'code' module. The culprit was hard-coded information in
erl_bif_types for functions of this module, which were
not updated. Since these functions have proper specs
these days and code duplication (pun intended) is never a
good idea, their type information was removed from
erl_bif_types.</p>
<p>
While doing this, some erroneous comments were fixed in
the code module and also made sure that the code now runs
without dialyzer warnings even when the
-Wunmatched_returns option is used.</p>
<p>
Some cleanups were applied to erl_bif_types too.</p>
<p>
Own Id: OTP-9100</p>
</item>
<item>
<p>
- Add spec for function that does not return - Strenghen
spec - Introduce types to avoid duplication in specs -
Add specs for functions that do not return - Add specs
for behaviour callbacks - Simplify two specs</p>
<p>
Own Id: OTP-9127</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.14.2</title>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
The Erlang VM now supports Unicode filenames. The feature
is turned on by default on systems where Unicode
filenames are mandatory (Windows and MacOSX), but can be
enabled on other systems with the '+fnu' emulator option.
Enabling the Unicode filename feature on systems where it
is not default is however considered experimental and not
to be used for production. Together with the Unicode file
name support, the concept of "raw filenames" is
introduced, which means filenames provided without
implicit unicode encoding translation. Raw filenames are
provided as binaries, not lists. For further information,
see stdlib users guide and the chapter about using
Unicode in Erlang. Also see the file module manual page.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-8887</p>
</item>
<item>
<p>
There is now a new function inet:getifaddrs/0 modeled
after C library function getifaddrs() on BSD and LInux
that reports existing interfaces and their addresses on
the host. This replaces the undocumented and unsupported
inet:getiflist/0 and inet:ifget/2.</p>
<p>
Own Id: OTP-8926</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.14.1.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>In embedded mode, on_load handlers that called
<c>code:priv_dir/1</c> or other functions in <c>code</c>
would hang the system. Since the <c>crypto</c>
application now contains an on_loader handler that calls
<c>code:priv_dir/1</c>, including the <c>crypto</c>
application in the boot file would prevent the system
from starting.</p>
<p>Also extended the <c>-init_debug</c> option to print
information about on_load handlers being run to
facilitate debugging.</p>
<p>
Own Id: OTP-8902 Aux Id: seq11703 </p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.14.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Fixed: inet:setopts(S, [{linger,{true,2}}]) returned
{error,einval} for SCTP sockets. The inet_drv had a bug
when checking the option size.</p>
<p>
Own Id: OTP-8726 Aux Id: seq11617 </p>
</item>
<item>
<p>
gen_udp:connect/3 was broken for SCTP enabled builds. It
did not detect remote end errors as it should.</p>
<p>
Own Id: OTP-8729</p>
</item>
<item>
<p>reference() has been substituted for ref() in the
documentation.</p>
<p>
Own Id: OTP-8733</p>
</item>
<item>
<p>A bug introduced in kernel-2.13.5.3 has been fixed. If
running <c>net_kernel:set_net_ticktime/1</c> twice within
the <c>TransitionPerod</c> the second call caused the
net_kernel process to crash with a <c>badmatch</c>.</p>
<p>
Own Id: OTP-8787 Aux Id: seq11657, OTP-8643 </p>
</item>
<item>
<p>
inet:getsockopt for SCTP sctp_default_send_param had a
bug to not initialize required feilds causing random
answers. It is now corrected.</p>
<p>
Own Id: OTP-8795 Aux Id: seq11655 </p>
</item>
<item>
<p>For a socket in the HTTP packet mode, the return value
from <c>gen_tcp:recv/2,3</c> if there is an error in the
header will be <c>{ok,{http_error,String}}</c> instead of
<c>{error,{http_error,String}}</c> to be consistent with
<c>ssl:recv/2,3</c>.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-8831</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
Even when configuring erlang with --enable-native-libs,
the native code for modules loaded very early (such as
lists) would not get loaded. This has been corrected.
(Thanks to Paul Guyot.)</p>
<p>
Own Id: OTP-8750</p>
</item>
<item>
<p>
The undocumented function inet:ifget/2 has been improved
to return interface hardware address (MAC) on platforms
supporting getaddrinfo() (such as BSD unixes). Note it
still does not work on all platforms for example not
Windows nor Solaris, so the function is still
undocumented.</p>
<p>
Buffer overflow and field init bugs for inet:ifget/2 and
inet:getservbyname/2 has also been fixed.</p>
<p>
Thanks to Michael Santos.</p>
<p>
Own Id: OTP-8816</p>
</item>
<item>
<p>
As a usability improvement the 'inet6' option to
functions gen_tcp:listen/2, gen_tcp:connect/3-4,
gen_udp:open/2 and gen_sctp:open/1-2 is now implicit if
the address argument or the 'ip' option contain an IPv6
address (8-tuple).</p>
<p>
Own Id: OTP-8822</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.14</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
os:find_executable can now be fed with the complete name
of the executable on Windows and still find it. I.e
os:find_executable("werl.exe") will work as
os:find_executable("werl").</p>
<p>
Own Id: OTP-3626</p>
</item>
<item>
<p>
The shell's line editing has been improved to more
resemble the behaviour of readline and other shells.
(Thanks to Dave Peticolas)</p>
<p>
Own Id: OTP-8635</p>
</item>
<item>
<p>Under certain circumstances the net kernel could hang.
(Thanks to Scott Lystig Fritchie.)</p>
<p>
Own Id: OTP-8643 Aux Id: seq11584 </p>
</item>
<item>
<p>
The kernel DNS resolver was leaking one or two ports if
the DNS reply could not be parsed or if the resolver(s)
caused noconnection type errors. Bug now fixed. A DNS
specification borderline truncated reply triggering the
port leakage bug has also been fixed.</p>
<p>
Own Id: OTP-8652</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>As of this version, the global name server no longer
supports nodes running Erlang/OTP R11B.</p>
<p>
Own Id: OTP-8527</p>
</item>
<item>
<p>
The file module's functions write,read and read_line now
handles named io_servers like 'standard_io' and
'standard_error' correctly.</p>
<p>
Own Id: OTP-8611</p>
</item>
<item>
<p>
The functions file:advise/4 and file:datasync/1 have been
added. (Thanks to Filipe David Manana.)</p>
<p>
Own Id: OTP-8637</p>
</item>
<item>
<p>When exchanging groups between nodes <c>pg2</c> did
not remove duplicated members. This bug was introduced in
R13B03 (kernel-2.13.4).</p>
<p>
Own Id: OTP-8653</p>
</item>
<item>
<p>
There is a new option 'exclusive' to file:open/2 that
uses the OS O_EXCL flag where supported to open the file
in exclusive mode.</p>
<p>
Own Id: OTP-8670</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.13.5.3</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
A bug introduced in Kernel 2.13.5.2 has been fixed.</p>
<p>
Own Id: OTP-8686 Aux Id: OTP-8643</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.13.5.2</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Under certain circumstances the net kernel could hang.
(Thanks to Scott Lystig Fritchie.)</p>
<p>
Own Id: OTP-8643 Aux Id: seq11584</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.13.5.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
A race condition in <c>os:cmd/1</c> could cause the
caller to get stuck in <c>os:cmd/1</c> forever.</p>
<p>
Own Id: OTP-8502</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.13.5</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>A race bug affecting <c>pg2:get_local_members/1</c>
has been fixed. The bug was introduced in R13B03.</p>
<p>
Own Id: OTP-8358</p>
</item>
<item>
<p>
The loading of native code was not properly atomic in the
SMP emulator, which could cause crashes. Also a per-MFA
information table for the native code has now been
protected with a lock since it turns that it could be
accessed concurrently in the SMP emulator. (Thanks to
Mikael Pettersson.)</p>
<p>
Own Id: OTP-8397</p>
</item>
<item>
<p>
user.erl (used in oldshell) is updated to handle unicode
in prompt strings (io:get_line/{1,2}). io_lib is also
updated to format prompts with the 't' modifier (i.e. ~ts
instead of ~s).</p>
<p>
Own Id: OTP-8418 Aux Id: OTP-8393 </p>
</item>
<item>
<p>
The resolver routines failed to look up the own node name
as hostname, if the OS native resolver was erroneously
configured, bug reported by Yogish Baliga, now fixed.</p>
<p>
The resolver routines now tries to parse the hostname as
an IP string as most OS resolvers do, unless the native
resolver is used.</p>
<p>
The DNS resolver inet_res and file resolver inet_hosts
now do not read OS configuration files until they are
needed. Since the native resolver is default, in most
cases they are never needed.</p>
<p>
The DNS resolver's automatic updating of OS configuration
file data (/etc/resolv.conf) now uses the 'domain'
keyword as default search domain if there is no 'search'
keyword.</p>
<p>
Own Id: OTP-8426 Aux Id: OTP-8381 </p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
The expected return value for an on_load function has
been changed. (See the section about code loading in the
Reference manual.)</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-8339</p>
</item>
<item>
<p>
Explicit top directories in archive files are now
optional.</p>
<p>
For example, if an archive (app-vsn.ez) just contains an
app-vsn/ebin/mod.beam file, the file info for the app-vsn
and app-vsn/ebin directories are faked using the file
info from the archive file as origin. The virtual
direcories can also be listed. For short, the top
directories are virtual if they does not exist.</p>
<p>
Own Id: OTP-8387</p>
</item>
<item>
<p>
<c>code:clash/0</c> now looks inside archives (.ez
files). (Thanks to Tuncer Ayaz.)</p>
<p>
Own Id: OTP-8413</p>
</item>
<item>
<p>
There are new <c>gen_sctp:connect_init/*</c> functions
that initiate an SCTP connection without blocking for the
result. The result is delivered asynchronously as an
sctp_assoc_change event. (Thanks to Simon Cornish.)</p>
<p>
Own Id: OTP-8414</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.13.4</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>A link in <c>pg2(3)</c> has been fixed. (Thanks to
Christophe Romain.)</p>
<p>
Own Id: OTP-8198</p>
</item>
<item>
<p>
A ticker process could potentially be blocked
indefinitely trying to send a tick to a node not
responding. If this happened, the connection would not be
brought down as it should.</p>
<p>
Own Id: OTP-8218</p>
</item>
<item>
<p>A bug in <c>pg2</c> when members who died did not
leave process groups has been fixed. (Thanks to Matthew
Dempsky.)</p>
<p>
Own Id: OTP-8259</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
The documentation is now built with open source tools
(xsltproc and fop) that exists on most platforms. One
visible change is that the frames are removed.</p>
<p>
Own Id: OTP-8201</p>
</item>
<item>
<p>
The top directory in archive files does not need to have
a <c>-vsn</c> suffix anymore. For example if the archive
file has the name like <c>mnesia-4.4.7.ez</c> the top
directory in the archive can either be named
<c>mnesia</c> or <c>mnesia-4.4.7</c>. If the archive file
has a name like <c>mnesia.ez</c> the top directory in the
archive must be named <c>mnesia</c> as earlier.</p>
<p>
Own Id: OTP-8266</p>
</item>
<item>
<p>The -on_load() directive can be used to run a function
when a module is loaded. It is documented in the section
about code loading in the Reference Manual.</p>
<p>
Own Id: OTP-8295</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.13.3</title>
<section><title>Improvements and New Features</title>
<list>
<item>
<p> The DNS resolver client inet_res has been rewritten,
documented and released. See inet_res(3) and Erts User's
Guide: Inet configuration. </p><p> It can formally not be
incompatible with respect to earlier versions since there
was no earlier official version. However it was used
before and some details have changed. </p><p>
Configuration now initializes from /etc/resolv.conf and
/etc/hosts on all unix platforms regardless of which
distribution mode the node is started in. The directory
(/etc) these files are supposed to reside in can be
changed via an environment variable. These configuration
file locations can also be changed in the inet
configuration. The files are monitored for change and
re-read, which makes a few resolver configuration
variables out of application control. The /etc/hosts
entries have now their own cache table that is shadowed
(with lookup method 'file' is used) by the application
configured host entries. This problem (that inet_res
configuration only worked for distribution mode long
names) was among other reported by Matthew O'Gorman many
moons ago. </p><p> The lookup methods are still 'native'
only per default. Resolver configuration is done on all
Unix platforms just to get a usable configuration for
direct calls to inet_res. </p><p> The functions
<c>inet_res:nslookup/3..5</c> and
<c>inet_res:nnslookup/4..4</c> are no longer recommended
to use, instead use <c>inet_res:lookup/3..5</c> and
<c>inet_res:resolve/3..5</c> which provide clearer
argument types and the possibility to override options in
the call. </p><p> Users of previous unsupported versions
of inet_res have included internal header files to get to
the internal record definitions in order to examine DNS
replies. This is still unsupported and there are access
functions in inet_dns to use instead. These are
documented in inet_res(3). </p><p> Bug fix: a compression
reference loop would make DNS message decoding loop
forever. Problem reported by Florian Weimer. </p><p> Bug
fix and patch suggestion by Sergei Golovan: configuring
IPv6 nameservers did not work. His patch (as he warned)
created many UDP sockets; one per nameserver. This has
been fixed in the released version. </p><p> Improvement:
<c>inet_res</c> is now EDNS0 capable. The current
implementation is simple and does not probe and cache
EDNS info for nameservers, which a fully capable
implementation probably should do. EDNS has to be enabled
via resolver configuration, and if a nameserver replies
that it does not support EDNS, <c>inet_res</c> falls back
to a regular DNS query. </p><p> Improvement: now
<c>inet_res</c> automatically falls back to TCP if it
gets a truncated answer from a nameserver. </p><p>
Warning: some of the ancient and exotic record types
handled by <c>inet_res</c> and <c>inet_dns</c> are not
supported by current versions of BIND, so they could not
be tested after the rewrite, with reasonable effort, e.g
MD, MF, NULL, and SPF. The risk for bugs in these
particular records is still low since their code is
mostly shared with other tested record types. </p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-7955 Aux Id: OTP-7107 OTP-6852 </p>
</item>
<item>
<p>
A TCP socket with option <c>{packet,4}</c> could crash
the emulator if it received a packet header with a very
large size value (>2Gb). The same bug caused
<c>erlang:decode_packet/3</c> to return faulty values.
(Thanks to Georgos Seganos.)</p>
<p>
Own Id: OTP-8102</p>
</item>
<item>
<p>
The file module has now a read_line/1 function similar to
the io:get_line/2, but with byte oriented semantics. The
function file:read_line/1 works for raw files as well,
but for good performance it is recommended to use it
together with the 'read_ahead' option for raw file
access.</p>
<p>
Own Id: OTP-8108</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.13.2</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
A bug when doing io:get_line (among other calls) from a
file opened with encoding other than latin1, causing
false unicode errors to occur, is now corrected.</p>
<p>
Own Id: OTP-7974</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
Added functionality to get higher resolution timestamp
from system. The erlang:now function returns a timestamp
that's not always consistent with the actual operating
system time (due to resilience against large time changes
in the operating system). The function os:timestamp/0 is
added to get a similar timestamp as the one being
returned by erlang:now, but untouched by Erlangs time
correcting and smoothing algorithms. The timestamp
returned by os:timestamp is always consistent with the
operating systems view of time, like the calendar
functions for getting wall clock time, but with higher
resolution. Example of usage can be found in the os
manual page.</p>
<p>
Own Id: OTP-7971</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.13.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Many concurrent calls to <c>os:cmd/1</c> will only block
one scheduler thread at a time, making an smp emulator
more responsive if the OS is slow forking processes.</p>
<p>
Own Id: OTP-7890 Aux Id: seq11219 </p>
</item>
<item>
<p>
Fixed hanging early RPC that did IO operation during node
start.</p>
<p>
Own Id: OTP-7903 Aux Id: seq11224 </p>
</item>
<item>
<p>
The error behavior of gen_tcp and gen_udp has been
corrected. gen_tcp:connect/3,4 and gen_udp:send/4 now
returns {error,eafnosupport} for conflicting destination
address versus socket address family. Other corner cases
for IP address string host names combined with not using
the native (OS) resolver (which is not default) has also
been changed to return {error,nxdomain} instead of
{error,einval}. Those changes just may surprise old
existing code. gen_tcp:listen/2 and gen_udp:open/2 now
fails for conflicting local address versus socket address
family instead of trying to use an erroneous address.
Problem reported by Per Hedeland.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-7929</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
Several glitches and performance issues in the Unicode
and I/O-system implementation of R13A have been
corrected.</p>
<p>
Own Id: OTP-7896 Aux Id: OTP-7648 OTP-7887 </p>
</item>
<item>
<p>
The unsupported DNS resolver client inet_res has now been
improved to handle NAPTR queries.</p>
<p>
Own Id: OTP-7925 Aux Id: seq11231 </p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.13</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
The old Erlang DNS resolver inet_res has been corrected
to handle TXT records with more than one character
string. Patch courtesy of Geoff Cant.</p>
<p>
Own Id: OTP-7588</p>
</item>
<item>
<p>When chunk reading a disk log opened in read_only
mode, bad terms could crash the disk log process.</p>
<p>
Own Id: OTP-7641 Aux Id: seq11090 </p>
</item>
<item>
<p>
<c>gen_tcp:send()</c> did sometimes (only observed on
Solaris) return <c>{error,enotconn}</c> instead of the
expected <c>{error,closed}</c> as the peer socket had
been explicitly closed.</p>
<p>
Own Id: OTP-7647</p>
</item>
<item>
<p>
The gen_sctp option sctp_peer_addr_params,
#sctp_paddrparams{address={IP,Port} was erroneously
decoded in the inet driver. This bug has now been
corrected.</p>
<p>
Own Id: OTP-7755</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
Erlang programs can now access STDERR on platforms where
such a file descriptor is available by using the
io_server 'standard_error', i.e.
io:format(standard_error,"~s~n",[ErrorMessage]),</p>
<p>
Own Id: OTP-6688</p>
</item>
<item>
<p>
The format of the string returned by
<c>erlang:system_info(system_version)</c> (as well as the
first message when Erlang is started) has changed. The
string now contains the both the OTP version number as
well as the erts version number.</p>
<p>
Own Id: OTP-7649</p>
</item>
<item>
<p>As of this version, the global name server no longer
supports nodes running Erlang/OTP R10B.</p>
<p>
Own Id: OTP-7661</p>
</item>
<item>
<p>
A <c>{nodedown, Node}</c> message passed by the
<c>net_kernel:monitor_nodes/X</c> functionality is now
guaranteed to be sent after <c>Node</c> has been removed
from the result returned by <c>erlang:nodes/Y</c>.</p>
<p>
Own Id: OTP-7725</p>
</item>
<item>
<p>The deprecated functions <c>erlang:fault/1</c>,
<c>erlang:fault/2</c>, and <c>file:rawopen/2</c> have
been removed.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-7812</p>
</item>
<item>
<p>
Nodes belonging to different independent clusters can now
co-exist on the same host with the help of a new
environment variable setting ERL_EPMD_PORT.</p>
<p>
Own Id: OTP-7826</p>
</item>
<item>
<p>The copyright notices have been updated.</p>
<p>
Own Id: OTP-7851</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.12.5.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>When chunk reading a disk log opened in read_only
mode, bad terms could crash the disk log process.</p>
<p>
Own Id: OTP-7641 Aux Id: seq11090 </p>
</item>
<item>
<p>
Calling <c>gen_tcp:send()</c> from several processes on
socket with option <c>send_timeout</c> could lead to much
longer timeout than specified. The solution is a new
socket option <c>{send_timeout_close,true}</c> that will
do automatic close on timeout. Subsequent calls to send
will then immediately fail due to the closed connection.</p>
<p>
Own Id: OTP-7731 Aux Id: seq11161 </p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.12.5</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>The documentation of <c>rpc:pmap/3</c> has been
corrected. (Thanks to Kirill Zaborski.)</p>
<p>
Own Id: OTP-7537</p>
</item>
<item>
<p>
The listen socket used for the distributed Erlang
protocol now uses the socket option 'reuseaddr', which is
useful when you force the listen port number using kernel
options 'inet_dist_listen_min' and 'inet_dist_listen_max'
and restarts a node with open connections.</p>
<p>
Own Id: OTP-7563</p>
</item>
<item>
<p>
Fixed memory leak of unclosed TCP-ports. A gen_tcp:send()
followed by a failing gen_tcp:recv() could in some cases
cause the port to linger after being closed.</p>
<p>
Own Id: OTP-7615</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>Processes spawned using <c>proc_lib</c> (including
<c>gen_server</c> and other library modules that use
<c>proc_lib</c>) no longer keep the entire argument list
for the initial call, but only the arity.</p>
<p>Also, if <c>proc_lib:spawn/1</c> is used to spawn a
fun, the actual fun is not kept, but only module,
function name, and arity of the function that implements
the fun.</p>
<p>The reason for the change is that keeping the initial
fun (or a fun in an argument list), would prevent
upgrading the code for the module. A secondary reason is
that keeping the fun and function arguments could waste a
significant amount of memory.</p>
<p>The drawback with the change is that the crash reports
will provide less precise information about the initial
call (only <c>Module:Function/Arity</c> instead of
<c>Module:Function(Arguments)</c>). The function
<c>proc_lib:initial_call/1</c> still returns a list, but
each argument has been replaced with a dummy atom.</p>
<p>
Own Id: OTP-7531 Aux Id: seq11036 </p>
</item>
<item>
<p>
<c>io:get_line/1</c> when reading from standard input is
now substantially faster. There are also some minor
performance improvements in <c>io:get_line/1</c> when
reading from any file opened in binary mode. (Thanks to
Fredrik Svahn.)</p>
<p>
Own Id: OTP-7542</p>
</item>
<item>
<p>
There is now experimental support for loading of code
from archive files. See the documentation of <c>code</c>,
<c>init</c>, <c>erl_prim_loader </c> and <c>escript</c>
for more info.</p>
<p>
The error handling of <c>escripts</c> has been improved.</p>
<p>
An <c>escript</c> may now set explicit arguments to the
emulator, such as <c>-smp enabled</c>.</p>
<p>
An <c>escript</c> may now contain a precompiled beam
file.</p>
<p>
An <c>escript</c> may now contain an archive file
containing one or more applications (experimental).</p>
<p>
The internal module <c>code_aux</c> has been removed.</p>
<p>
Own Id: OTP-7548 Aux Id: otp-6622 </p>
</item>
<item>
<p>
<c>code:is_sticky/1</c> is now documented. (Thanks to
Vlad Dumitrescu.)</p>
<p>
Own Id: OTP-7561</p>
</item>
<item>
<p>
In the job control mode, the "s" and "r" commands now
take an optional argument to specify which shell to
start. (Thanks to Robert Virding.)</p>
<p>
Own Id: OTP-7617</p>
</item>
<item>
<p>
<c>net_adm:world/0,1</c> could crash if called in an
emulator that has not been started with either the
<c>-sname</c> or <c>-name</c> option; now it will return
an empty list. (Thanks to Edwin Fine.)</p>
<p>
Own Id: OTP-7618</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.12.4</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Large files are now handled on Windows, where the
filesystem supports it.</p>
<p>
Own Id: OTP-7410</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
New BIF <c>erlang:decode_packet/3</c> that extracts a
protocol packet from a binary. Similar to the socket
option <c>{packet, Type}</c>. Also documented the socket
packet type <c>http</c> and made it official.
<em>NOTE</em>: The tuple format for <c>http</c> packets
sent from an active socket has been changed in an
incompatible way.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-7404</p>
</item>
<item>
<p>
Setting the <c>{active,once}</c> for a socket (using
inets:setopts/2) is now specially optimized (because the
<c>{active,once}</c> option is typically used much more
frequently than other options).</p>
<p>
Own Id: OTP-7520</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.12.3</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
SCTP_ADDR_CONFIRMED events are now handled by gen_sctp.</p>
<p>
Own Id: OTP-7276</p>
</item>
<item>
<p>When leaving a process group with <c>pg2:leave/2</c>
the process was falsely assumed to be a member of the
group. This bug has been fixed.</p>
<p>
Own Id: OTP-7277</p>
</item>
<item>
<p>
In the Erlang shell, using up and down arrow keys, the
wrong previous command could sometimes be retrieved.</p>
<p>
Own Id: OTP-7278</p>
</item>
<item>
<p>
The documentation for <c>erlang:trace/3</c> has been
corrected.</p>
<p>
Own Id: OTP-7279 Aux Id: seq10927 </p>
</item>
<item>
<p>
In the SMP emulator, there was small risk that
<c>code:purge(Mod)</c> would kill a process that was
running code in <c>Mod</c> and unload the module
<c>Mod</c> before the process had terminated.
<c>code:purge(Mod)</c> now waits for confirmation (using
<c>erlang:monitor/2</c>) that the process has been killed
before proceeding.</p>
<p>
Own Id: OTP-7282</p>
</item>
<item>
<p>
<c>zlib:inflate</c> failed when the size of the inflated
data was an exact multiple of the internal buffer size
(4000 bytes by default).</p>
<p>
Own Id: OTP-7359</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
Additional library directories can now be specified in
the environment variable ERL_LIBS. See the manual page
for the <c>code</c> module. (Thanks to Serge Aleynikov.)</p>
<p>
Own Id: OTP-6940</p>
</item>
<item>
<p>
crypto and zlib drivers improved to allow concurrent smp
access.</p>
<p>
Own Id: OTP-7262</p>
</item>
<item>
<p>
There is a new function <c>init:stop/1</c> which can be
used to shutdown the system cleanly AND generate a
non-zero exit status or crash dump. (Thanks to Magnus
Froberg.)</p>
<p>
Own Id: OTP-7308</p>
</item>
<item>
<p>
The <c>hide</c> option for <c>open_port/2</c> is now
documented. (Thanks to Richard Carlsson.)</p>
<p>
Own Id: OTP-7358</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.12.2.1</title>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
<c>os:cmd/1</c> on unix platforms now use <c>/bin/sh</c>
as shell instead of looking for <c>sh</c> in the
<c>PATH</c> environment.</p>
<p>
Own Id: OTP-7283</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.12.2</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>A bug caused by a race condition involving
<c>disk_log</c> and <c>pg2</c> has been fixed.</p>
<p>
Own Id: OTP-7209 Aux Id: seq10890 </p>
</item>
<item>
<p>The beta testing module <c>gen_sctp</c> now supports
active mode as stated in the documentation. Active mode
is still rather untested, and there are some issues about
what should be the right semantics for
<c>gen_sctp:connect/5</c>. In particular: should it be
blocking or non-blocking or choosable. There is a high
probability it will change semantics in a (near) future
patch.</p> <p>Try it, give comments and send in bug
reports!</p>
<p>
Own Id: OTP-7225</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p><c>erlang:system_info/1</c> now accepts the
<c>logical_processors</c>, and <c>debug_compiled</c>
arguments. For more info see the, <c>erlang(3)</c>
documentation.</p> <p>The scale factor returned by
<c>test_server:timetrap_scale_factor/0</c> is now also
effected if the emulator uses a larger amount of
scheduler threads than the amount of logical processors
on the system. </p>
<p>
Own Id: OTP-7175</p>
</item>
<item>
<p>
Updated the documentation for
<c>erlang:function_exported/3</c> and <c>io:format/2</c>
functions to no longer state that those functions are
kept mainly for backwards compatibility.</p>
<p>
Own Id: OTP-7186</p>
</item>
<item>
<p>
A process executing the <c>processes/0</c> BIF can now be
preempted by other processes during its execution. This
in order to disturb the rest of the system as little as
possible. The returned result is, of course, still a
consistent snapshot of existing processes at a time
during the call to <c>processes/0</c>.</p>
<p>
The documentation of the <c>processes/0</c> BIF and the
<c>is_process_alive/1</c> BIF have been updated in order
to clarify the difference between an existing process and
a process that is alive.</p>
<p>
Own Id: OTP-7213</p>
</item>
<item>
<p><c>tuple_size/1</c> and <c>byte_size/1</c> have been
substituted for <c>size/1</c> in the documentation.</p>
<p>
Own Id: OTP-7244</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.12.1.2</title>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>The <c>{allocator_sizes, Alloc}</c> and
<c>alloc_util_allocators</c> arguments are now accepted
by <c>erlang:system_info/1</c>. For more information see
the <c>erlang(3)</c> documentation.</p>
<p>
Own Id: OTP-7167</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.12.1.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Fixed a problem in group that could cause the ssh server
to lose answers or hang.</p>
<p>
Own Id: OTP-7185 Aux Id: seq10871 </p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.12.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
file:read/2 and file:consult_stream/1,3 did not use an
empty prompt on I/O devices. This bug has now been
corrected.</p>
<p>
Own Id: OTP-7013</p>
</item>
<item>
<p>
The sctp driver has been updated to work against newer
lksctp packages e.g 1.0.7 that uses the API spelling
change adaption -> adaptation. Older lksctp (1.0.6) still
work. The erlang API in gen_sctp.erl and inet_sctp.hrl
now spells 'adaptation' regardless of the underlying C
API.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-7120</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>The documentation has been updated so as to reflect
the last updates of the Erlang shell as well as the minor
modifications of the control sequence <c>p</c> of the
<c>io_lib</c> module.</p> <p>Superfluous empty lines have
been removed from code examples and from Erlang shell
examples.</p>
<p>
Own Id: OTP-6944 Aux Id: OTP-6554, OTP-6911 </p>
</item>
<item>
<p><c>tuple_size/1</c> and <c>byte_size/1</c> have been
substituted for <c>size/1</c>.</p>
<p>
Own Id: OTP-7009</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.12</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
A bug for raw files when reading 0 bytes returning 'eof'
instead of empty data has been corrected.</p>
<p>
Own Id: OTP-6291 Aux Id: OTP-6967 </p>
</item>
<item>
<p>
A bug in gen_udp:fdopen reported by David Baird and also
found by Dialyzer has been fixed.</p>
<p>
Own Id: OTP-6836 Aux Id: OTP-6594 </p>
</item>
<item>
<p>
Calling <c>error_logger:tty(true)</c> multiple times does
not give multiple error log printouts.</p>
<p>
Own Id: OTP-6884 Aux Id: seq10767 </p>
</item>
<item>
<p>The global name server now ignores <c>nodeup</c>
messages when the command line flag <c>-connect_all
false</c> has been used. (Thanks to Trevor
Woollacott.)</p>
<p>
Own Id: OTP-6931</p>
</item>
<item>
<p>file:write_file/3, file:write/2 and file:read/2 could
crash (contrary to documentation) for odd enough file
system problems, e.g write to full file system. This bug
has now been corrected.</p> <p>In this process the file
module has been rewritten to produce better error codes.
Posix error codes now originate from the OS file system
calls or are generated only for very similar causes (for
example 'enomem' is generated if a memory allocation
fails, and 'einval' is generated if the file handle in
Erlang is a file handle but currently invalid).</p>
<p>More Erlang-ish error codes are now generated. For
example <c>{error,badarg}</c> is now returned from
<c>file:close/1</c> if the argument is not of a file
handle type. See file(3).</p> <p>The possibility to write
a single byte using <c>file:write/2</c> instead of a list
or binary of one byte, contradictory to the
documentation, has been removed.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-6967 Aux Id: OTP-6597 OTP-6291 </p>
</item>
<item>
<p>
Monitor messages produced by the system monitor
functionality, and garbage collect trace messages could
contain erroneous heap and/or stack sizes when the actual
heaps and/or stacks were huge.</p>
<p>
As of erts version 5.6 the <c>large_heap</c> option to
<c>erlang:system_monitor/[1,2]</c> has been modified. The
monitor message is sent if the sum of the sizes of all
memory blocks allocated for all heap generations is equal
to or larger than the specified size. Previously the
monitor message was sent if the memory block allocated
for the youngest generation was equal to or larger than
the specified size.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-6974 Aux Id: seq10796 </p>
</item>
<item>
<p>
<c>inet:getopts/2</c> returned random values on Windows
Vista.</p>
<p>
Own Id: OTP-7003</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>
Minor documentation corrections for file:pread/2 and
file:pread/3.</p>
<p>
Own Id: OTP-6853</p>
</item>
<item>
<p>
The deprecated functions <c>file:file_info/1</c>,
<c>init:get_flag/1</c>, <c>init:get_flags/0</c>, and
<c>init:get_args/0</c> have been removed.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-6886</p>
</item>
<item>
<p>
Contract directives for modules in Kernel and STDLIB.</p>
<p>
Own Id: OTP-6895</p>
</item>
<item>
<p>The functions io:columns/0, io:columns/1, io:rows/0
and io:rows/1 are added to allow the user to get
information about the terminal geometry. The shell takes
some advantage of this when formatting output. For
regular files and other io-devices where height and width
are not applicable, the functions return
{error,enotsup}.</p>
<p>Potential incompatibility: If one has written a custom
io-handler, the handler has to either return an error or
take care of io-requests regarding terminal height and
width. Usually that is no problem as io-handlers, as a
rule of thumb, should give an error reply when receiving
unknown io-requests, instead of crashing.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-6933</p>
</item>
<item>
<p>
The undocumented and unsupported functions
<c>inet:ip_to_bytes/1</c>, <c>inet:ip4_to_bytes/1</c>,
<c>inet:ip6_to_bytes/1</c>, and
<c>inet:bytes_to_ip6/16</c> have been removed.</p>
<p>
Own Id: OTP-6938</p>
</item>
<item>
<p>
Added new checksum combine functions to <c>zlib</c>. And
fixed a bug in <c>zlib:deflate</c>. Thanks Matthew
Dempsky.</p>
<p>
Own Id: OTP-6970</p>
</item>
<item>
<p>
The <c>spawn_monitor/1</c> and <c>spawn_monitor/3</c> BIFs
are now auto-imported (i.e. they no longer need an
<c>erlang:</c> prefix).</p>
<p>
Own Id: OTP-6975</p>
</item>
<item>
<p>All functions in the <c>code</c> module now fail with
an exception if they are called with obviously bad
arguments, such as a tuple when an atom was expected.
Some functions now also fail for undocumented argument
types (for instance, <c>ensure_loaded/1</c> now only
accepts an atom as documented; it used to accept a string
too).</p>
<p>Dialyzer will generally emit warnings for any
calls that use undocumented argument types. Even if the
call happens to still work in R12B, you should correct
your code. A future release will adhere to the
documentation.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-6983</p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.11.5.2</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
The kernel parameter dist_auto_connect once could fail to
block a node if massive parallel sends were issued
during a transient failure of network communication</p>
<p>
Own Id: OTP-6893 Aux Id: seq10753 </p>
</item>
</list>
</section>
</section>
<section><title>Kernel 2.11.5.1</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
The internal (rarely used) DNS resolver has been modified
to not use the domain search list when asked to resolve
an absolute name; a name with a terminating dot. There
was also a bug causing it to create malformed DNS queries
for absolute names that has been corrected, correction
suggested by Scott Lystig Fritchie. The code has also
been corrected to look up cached RRs in the same search
order as non-cached, now allows having the root domain
among the search domains, and can now actually do a zone
transfer request.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-6806 Aux Id: seq10714 EABln35459 </p>
</item>
<item>
<p>
zlib:close/1 would leave an EXIT message in the message
queue if the calling process had the trap_exit flag
enabled.</p>
<p>
Own Id: OTP-6811</p>
</item>
</list>
</section>
<section><title>Improvements and New Features</title>
<list>
<item>
<p>The documentation of <c>process_flag(priority,
Level)</c> has been updated, see the <c>erlang(3)</c>
documentation. </p>
<p>
Own Id: OTP-6745 Aux Id: OTP-6715 </p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.11.5</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>The shell has been updated to fix the following flaws:
Shell process exit left you with an unresponsive initial
shell if not using oldshell. Starting a restricted shell
with a nonexisting callback module resulted in a shell
where no commands could be used, not even init:stop/0.
Fun's could not be used as parameters to local shell
functions (in shell_default or user_default) when
restricted_shell was active.</p>
<p>Own Id: OTP-6537</p>
</item>
<item>
<p>The undocumented feature gen_tcp:fdopen/2 was broken
in R11B-4. It is now fixed again.</p>
<p>Own Id: OTP-6615</p>
</item>
<item>
<p>Corrected cancellation of timers in three places in the
inet_res module. (Problem found by Dialyzer.)</p>
<p>Own Id: OTP-6676</p>
</item>
</list>
</section>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p>Corrected protocol layer flue for socket options
SO_LINGER, SO_SNDBUF and SO_RCVBUF, for SCTP.</p>
<p>Own Id: OTP-6625 Aux Id: OTP-6336 </p>
</item>
<item>
<p>The behaviour of the inet option {active,once} on peer
close is improved and documented.</p>
<p>Own Id: OTP-6681</p>
</item>
<item>
<p>The inet option send_timeout for connection oriented
sockets is added to allow for timeouts in communicating
send requests to the underlying TCP stack.</p>
<p>Own Id: OTP-6684 Aux Id: seq10637 OTP-6681 </p>
</item>
<item>
<p>Minor Makefile changes.</p>
<p>Own Id: OTP-6689 Aux Id: OTP-6742 </p>
</item>
<item>
<p>The documentation of <c>process_flag(priority, Level)</c> has been updated, see the <c>erlang(3)</c>
documentation. </p>
<p>Own Id: OTP-6715</p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.11.4.2</title>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p>process_flag/2 accepts the new flag <c>sensitive</c>.</p>
<p>Own Id: OTP-6592 Aux Id: seq10555 </p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.11.4.1</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>A bug in gen_udp:open that broke the 'fd' option has been
fixed.</p>
<p>Own Id: OTP-6594 Aux Id: seq10619 </p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.11.4</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>Added a warning to the documentation for the
<c>error_logger</c> functions <c>error_msg/1,2</c>,
<c>warning_msg/1,2</c> and <c>info_msg/1,2</c> that
calling these function with bad arguments can crash the
standard event handler.</p>
<p>Own Id: OTP-4575 Aux Id: seq7693 </p>
</item>
<item>
<p>A bug in <c>inet_db</c> concerning getting the resolver
option <c>retry</c> has been corrected.</p>
<p>Own Id: OTP-6380 Aux Id: seq10534 </p>
</item>
<item>
<p>Names registered by calling
<c>global:register_name()</c> or
<c>global:re_register_name()</c> were not always
unregistered when the registering or registered process
died. This bug has been fixed.</p>
<p>Own Id: OTP-6428</p>
</item>
<item>
<p>When setting the kernel configuration parameter
<c>error_logger</c> to <c>false</c>, the documentation
stated that "No error logger handler is installed". This
is true, but error logging is not turned off, as the
initial, primitive error logger event handler is kept,
printing raw event messages to tty.</p>
<p>Changing this behavior can be viewed as a backward
incompatible change. Instead a new value <c>silent</c>
for the configuration parameter has been added, which
ensures that error logging is completely turned off.</p>
<p>Own Id: OTP-6445</p>
</item>
<item>
<p>Clarified the documentation for <c>code:lib_dir/1</c> and
<c>code:priv_dir/1</c>. The functions traverse the names
of the code path, they do not search the actual
directories.</p>
<p>Own Id: OTP-6466</p>
</item>
<item>
<p><c>io:setopts</c> returned <c>{error,badarg}</c>, when
called with only an <c>expand_fun</c> argument. (Thanks to
igwan.)</p>
<p>Own Id: OTP-6508</p>
</item>
</list>
</section>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p>An interface towards the SCTP Socket API Extensions
has been implemented.It is an Open Source patch courtesy
of Serge Aleynikov and Leonid Timochouk. The Erlang code
parts has been adapted by the OTP team, changing the
Erlang API somewhat.</p>
<p>The Erlang interface consists of the module
<c>gen_sctp</c> and an include file
<c>-include_lib("kernel/include/inet_sctp.hrl").</c> for
option record definitions. The <c>gen_sctp</c> module is
documented.</p>
<p>The delivered Open Source patch, before the OTP team
rewrites, was written according to
<url href="http://tools.ietf.org/html/draft-ietf-tsvwg-sctpsocket-13">http://tools.ietf.org/html/draft-ietf-tsvwg-sctpsocket-13</url>
and was claimed to work fine, tested on Linux Fedora Core
5.0 (kernel 2.6.15-2054 or later) and on Solaris 10 and
11. The OTP team rewrites used the same standard document
but might have accidentally broken some functionality. If
so, it will soon be patched to working state. The tricky
parts in C and the general design has essentially not
changed. During the rewrites the code was hand tested on
SuSE Linux Enterprise Server 10, and briefly on Solaris
10. Feedbach on code and docs is very much
appreciated.</p>
<p>The SCTP interface is in beta state. It has only been
hand tested and has no automatic test suites in OTP
meaning everything is most certainly not tested. Socket
active mode is broken. IPv6 is not tested. The documentation
has been reworked due to the API changes,
but has not been proofread after this.</p>
<p>Thank you from the OTP team to Serge Aleynikov and
Leonid Timochouk for a valuable contribution. We hope we
have not messed it up too much.</p>
<p>Own Id: OTP-6336</p>
</item>
<item>
<p>A <c>{minor_version,Version}</c> option is now recognized
by <c>term_to_binary/2</c>. {minor_version,1} will cause
floats to be encoded in an exact and more space-efficient
way compared to the previous encoding.</p>
<p>Own Id: OTP-6434</p>
</item>
<item>
<p>Monitoring of nodes has been improved. Now the following
properties apply to
<c>net_kernel:monitor_nodes/[1,2]</c>:</p>
<list type="bulleted">
<item><c>nodeup</c> messages will be delivered before delivery
of any message from the remote node passed through the
newly established connection. </item>
<item><c>nodedown</c> messages will not be delivered until all
messages from the remote node that have been passed
through the connection have been delivered. </item>
<item>Subscriptions can also be made before the
<c>net_kernel</c> server has been started. </item>
</list>
<p>Own Id: OTP-6481</p>
</item>
<item>
<p>Setting and getting socket options in a "raw" fashion is
now allowed. Using this feature will inevitably produce
non portable code, but will allow setting ang getting
arbitrary uncommon options on TCP stacks that do have
them.</p>
<p>Own Id: OTP-6519</p>
</item>
<item>
<p>Dialyzer warnings have been eliminated.</p>
<p>Own Id: OTP-6523</p>
</item>
<item>
<p>The documentation for <c>file:delete/1</c> and
<c>file:set_cwd/1</c> has been updated to clarify what
happens if the input arguments are of an incorrect type.</p>
<p>Own Id: OTP-6535</p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.11.3.1</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>An erroneous packet size could be used for the first
messages passed through a newly established connection
between two Erlang nodes. This could cause messages to be
discarded, or termination of the connection.</p>
<p>Own Id: OTP-6473</p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.11.3</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>On Unix, the <c>unix:cmd/1</c> function could leave an
'EXIT' message in the message queue for the calling
process That problem was more likely to happen in an SMP
emulator.</p>
<p>Own Id: OTP-6368</p>
</item>
</list>
</section>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p>More interfaces are added in erl_ddll, to support
different usage scenarios.</p>
<p>Own Id: OTP-6307 Aux Id: OTP-6234 </p>
</item>
<item>
<p>Locks set by calling <c>global:set_lock()</c> were not
always deleted when the locking process died. This bug
has been fixed.</p>
<p>Own Id: OTP-6341 Aux Id: seq10445 </p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.11.2</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>Behavior in case of disappeared nodes when using he
dist_auto_connect once got changed in R11B-1. The
timeouts regarding normal distributed operations is now
reverted to the old (pre R11B-1).</p>
<p>Own Id: OTP-6258 Aux Id: OTP-6200, seq10449 </p>
</item>
<item>
<p>Start-up problems for the internal process used by the
<c>inet:gethostbyname()</c> functions were eliminated. If
the internal process (<c>inet_gethost_native</c>) had not
previously been started, and if several processes at the
same time called one of the <c>inet:gethostbyname()</c>
functions, the calls could fail.</p>
<p>Own Id: OTP-6286</p>
</item>
</list>
</section>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p>Code cleanup: the old internal obsolete file_server has
been removed. It was only used when communicating with R7
and older nodes.</p>
<p>Own Id: OTP-6245</p>
</item>
<item>
<p>Trying to open a non-existent or badly formed disk log
no longer results in a crash report. In particular,
<c>ets:file2tab/1</c> reports no error when the argument
is not a well-formed disk log file. (The return value has
not been changed, it is still an error tuple.)</p>
<p>Own Id: OTP-6278 Aux Id: seq10421 </p>
</item>
<item>
<p>There are new BIFs <c>erlang:spawn_monitor/1,3</c>,
and the new option <c>monitor</c> for
<c>spawn_opt/2,3,4,5</c>.</p>
<p>The <c>observer_backend</c> module has been updated to
handle the new BIFs.</p>
<p>Own Id: OTP-6281</p>
</item>
<item>
<p>To help Dialyzer find more bugs, many functions in the
Kernel and STDLIB applications now only accept arguments
of the type that is documented.</p>
<p>For instance, the functions <c>lists:prefix/2</c> and
<c>lists:suffix/2</c> are documented to only accept lists
as their arguments, but they actually accepted anything
and returned <c>false</c>. That has been changed so that
the functions cause an exception if one or both arguments
are not lists.</p>
<p>Also, the <c>string:strip/3</c> function is documented
to take a character argument that is a character to strip
from one or both ends of the string. Given a list instead
of a character, it used to do nothing, but will now cause
an exception.</p>
<p>Dialyzer will find most cases where those functions
are passed arguments of the wrong type.</p>
<p>*** POTENTIAL INCOMPATIBILITY ***</p>
<p>Own Id: OTP-6295</p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.11.1.1</title>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p>There is now an option read_packets for UDP sockets that
sets the maximum number of UDP packets that will be read
for each invocation of the socket driver.</p>
<p>Own Id: OTP-6249 Aux Id: seq10452 </p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.11.1</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>In R11B-0, the erl_ddll server process is always started.
Despite that, the configuration parameter
<c>start_ddll</c> for the Kernel application was still
obeyed, which would cause the erl_ddll server to be
started TWICE (and the system shutting down as a result).
In this release, <c>start_ddll</c> is no longer used and
its documentation has been removed.</p>
<p>Own Id: OTP-6163</p>
</item>
<item>
<p>The kernel option {dist_auto_connect,once} could block
out nodes that had never been connected, causing
persistent partitioning of networks. Furthermore, partial
restarts of networks could cause inconsistent global name
databases. Both problems are now solved.</p>
<p>Own Id: OTP-6200 Aux Id: seq10377 </p>
</item>
</list>
</section>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p>Late arriving tcp_closed and udp_closed messages are now
removed from the message queue of a process calling
gen_tcp:close/1, gen_udp:close/1, and inet:close/1.</p>
<p>Own Id: OTP-6197</p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.11</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>When repairing a disk log with a corrupt index file
(caused by for instance a hard disk failure) the old
contents of the index file is kept unmodified. This will
make repeated attempts to open the disk log fail every
time.</p>
<p>Own Id: OTP-5558 Aux Id: seq9823 </p>
</item>
<item>
<p>Previously <c>unlink/1</c> and <c>erlang:demonitor/2</c>
behaved completely asynchronous. This had one undesirable
effect, though. You could never know when you were
guaranteed <em>not</em> to be affected by a link that you
had unlinked or a monitor that you had demonitored.</p>
<p>The new behavior of <c>unlink/1</c> and
<c>erlang:demonitor/2</c> can be viewed as two operations
performed atomically. Asynchronously send an unlink
signal or a demonitor signal, and ignore any future
results of the link or monitor.</p>
<p><em>NOTE</em>: This change can cause some obscure code
to fail which previously did not. For example, the
following code might hang:</p>
<code type="none">
Mon = erlang:monitor(process, Pid),
%% ...
exit(Pid, bang),
erlang:demonitor(Mon),
receive
{'DOWN', Mon, process, Pid, _} -> ok
%% We were previously guaranteed to get a down message
%% (since we exited the process ourself), so we could
%% in this case leave out:
%% after 0 -> ok
end,
</code>
<p>*** POTENTIAL INCOMPATIBILITY ***</p>
<p>Own Id: OTP-5772</p>
</item>
<item>
<p>The behavior when an application fails to start and
possibly causes the runtime system to halt has been
cleaned up, including fixing some minor bugs.</p>
<p><c>application_controller</c> should now always terminate
with a non-nested string, meaning the slogan in an
<c>erl_crash.dump</c> should always be easy to read.</p>
<p><c>init</c> now makes sure that the slogan passed to
<c>erlang:halt/1</c> does not exceed the maximum allowed
length.</p>
<p>Redundant calls to <c>list_to_atom/1</c> has been removed
from the primitive <c>error_logger</c> event handler.
(Thanks Serge Aleynikov for pointing this out).</p>
<p>The changes only affects the contents of the error
messages and crashdump file slogan.</p>
<p>Own Id: OTP-5964</p>
</item>
<item>
<p>The <c>erl_ddll</c> server is now started when OTP is
started and placed under the Kernel supervisor. This
fixes several minor issues. It used to be started on
demand.</p>
<p>The documentation for the <c>start</c> and <c>stop</c>
functions in the <c>erl_ddll</c> module has been removed,
as those functions are not meant to be used by other
applications.</p>
<p>Furthermore, the <c>erl_ddll:stop/1</c> function no longer
terminates the <c>erl_ddll</c> server, as that would
terminate the entire runtime system.</p>
<p>Own Id: OTP-6033</p>
</item>
</list>
</section>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p>Removed some unused functions from
<c>application_master</c>.</p>
<p>Own Id: OTP-3889</p>
</item>
<item>
<p>Global no longer allows the registration of a process
under more than one name. If the old (buggy) behavior is
desired the Kernel application variable
<c>global_multi_name_action</c> can be given the value
<c>allow</c>.</p>
<p>Own Id: OTP-5640 Aux Id: OTP-5603</p>
</item>
<item>
<p>The (slightly misleading) warnings that was shown when
the <c>erlang.erl</c> file was compiled has been
eliminated.</p>
<p>Own Id: OTP-5947</p>
</item>
<item>
<p>The <c>auth</c> module API is deprecated.</p>
<p>Own Id: OTP-6037</p>
</item>
<item>
<p>Added <c>erlang:demonitor/2</c>, making it possible to at
the same time flush a received <c>'DOWN'</c> message, if
there is one. See <c>erlang(3)</c>.</p>
<p>Own Id: OTP-6100 Aux Id: OTP-5772 </p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.10.13</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>Large files (more than 2 GBytes) are now handled on
Solaris 8.</p>
<p>Own Id: OTP-5849 Aux Id: seq10157</p>
</item>
<item>
<p>During startup, a garbage <c>{'DOWN', ...}</c> message was
left by <c>inet_gethost_native</c>, that caused problems
for the starting code server.</p>
<p>Own Id: OTP-5978 Aux Id: OTP-5974</p>
</item>
</list>
</section>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p><c>global</c> now makes several attempts to connect nodes
when maintaining the fully connected network. More than one
attempt is sometimes needed under very heavy load.</p>
<p>Own Id: OTP-5889</p>
</item>
<item>
<p><c>erl_epmd</c> now explicitly sets the timeout to
<c>infinity</c> when calling <c>gen_server:call</c>. The
old timeout of 15 seconds could time out under very heavy
load.</p>
<p>Own Id: OTP-5959</p>
</item>
<item>
<p>Corrected the start of code server to use reference-tagged
tuples to ensure that an unexpected message sent to
the parent process does not cause a halt of the system.
Also removed the useless <c>start/*</c> functions in both
<c>code.erl</c> and <c>code_server.erl</c> and no longer
exports the <c>init</c> function from
<c>code_server.erl</c>.</p>
<p>Own Id: OTP-5974 Aux Id: seq10243, OTP-5978</p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.10.12</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>A bug in <c>global</c> has been fixed: the locker process
added <c>nonode@nohost</c> to the list of nodes to lock.
This could happen before any nodes got known to the global
name server. Depending on net configuration the symptom was
a delay.</p>
<p>Own Id: OTP-5792 Aux Id: OTP-5563</p>
</item>
<item>
<p>If an <c>.app</c> file is missing, the error reason
returned by <c>application:load/1</c> has been corrected
to <c>{"no such file or directory", "FILE.app"}</c>,
instead of the less informative <c>{"unknown POSIX error","FILE.app"}</c>.</p>
<p>Own Id: OTP-5809</p>
</item>
<item>
<p>Bug fixes: <c>disk_log:accessible_logs/0</c> no longer
reports all <c>pg2</c> process groups as distributed disk
logs; <c>disk_log:pid2name/1</c> did not recognize
processes of distributed disk logs.</p>
<p>Own Id: OTP-5810</p>
</item>
<item>
<p>The functions <c>file:consult/1</c>,
<c>file:path_consult/2</c>, <c>file:eval/1,2</c>,
<c>file:path_eval/2,3</c>, <c>file:script/1,2</c>,
<c>file:path_script/2,3</c> now return correct line
numbers in error tuples.</p>
<p>Own Id: OTP-5814</p>
</item>
<item>
<p>If there were user-defined variables in the boot script,
and their values were not provided using
the <c>-boot_var</c> option, the emulator would refuse to
start with a confusing error message. Corrected to show a
clear, understandable message.</p>
<p>The <c>prim_file</c> module was modified to not depend
on the <c>lists</c> module, to make it possible to start
the emulator using a user-defined loader. (Thanks to
Martin Bjorklund.)</p>
<p>Own Id: OTP-5828 Aux Id: seq10151</p>
</item>
<item>
<p>Minor corrections in the description of open modes.
(Thanks to Richard Carlsson.)</p>
<p>Own Id: OTP-5856</p>
</item>
</list>
</section>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p><c>application_controller</c> now terminates with the
actual error reason, instead of <c>shutdown</c>. This
means that the crash dump now should be somewhat more
informative, in the case where the runtime system is
terminated due to an error in an application.</p>
<p>Example: If the (permanent) application <c>app1</c> fails
to start, the slogan now will be: "<c>Kernel pid terminated (application_controller) ({application_start_failure,app1,{shutdown, {app1,start,[normal,[]]}}})</c>"</p>
<p>rather than the previous "<c>Kernel pid terminated (application_controller) (shutdown)</c>".</p>
<p>Own Id: OTP-5811</p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.10.11.1</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>Timers could sometimes timeout too early. This bug has
now been fixed.</p>
<p>Automatic cancellation of timers created by
<c>erlang:send_after(Time,</c> pid(), Msg), and
<c>erlang:start_timer(Time,</c> pid(), Msg) has been
introduced.
Timers created with the receiver specified by a pid, will
automatically be cancelled when the receiver exits. For
more information see the <c>erlang(3)</c> man page.</p>
<p>In order to be able to maintain a larger amount of timers
without increasing the maintenance cost, the internal
timer wheel and bif timer table have been enlarged.</p>
<p>Also a number of minor bif timer optimizations have been
implemented.</p>
<p>Own Id: OTP-5795 Aux Id: OTP-5090, seq8913, seq10139,
OTP-5782</p>
</item>
</list>
</section>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p>Documentation improvements:</p>
<p>- documentation for <c>erlang:link/1</c> corrected</p>
<p>- command line flag <c>-code_path_cache</c> added</p>
<p>- <c>erl</c> command line flags clarifications</p>
<p>- <c>net_kernel(3)</c> clarifications</p>
<p>Own Id: OTP-5847</p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.10.11</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>Several bug fixes and improvements in the global name
registration facility (see <c>global(3)</c>):</p>
<list type="bulleted">
<item>the name resolving procedure did not always unlink no
longer registered processes;</item>
<item>the global name could sometimes hang when a
<c>nodedown</c> was immediately followed by a
<c>nodeup</c>;</item>
<item>global names were not always unregistered when a node
went down;</item>
<item>it is now possible to set and delete locks at
the same time as the global name server is resolving
names--the handling of global locks has been separated
from registration of global names;</item>
</list>
<p>As of this version, <c>global</c> no longer supports nodes
running Erlang/OTP R7B or earlier.</p>
<p>*** POTENTIAL INCOMPATIBILITY ***</p>
<p>Own Id: OTP-5563</p>
</item>
<item>
<p>The functions <c>global:set_lock/3</c> and
<c>global:trans/4</c> now accept the value <c>0</c>
(zero) of the <c>Retries</c> argument.</p>
<p>Own Id: OTP-5737</p>
</item>
<item>
<p>The <c>inet:getaddr(Addr, Family)</c> no longer
validates the <c>Addr</c> argument if it is a 4 or 8
tuple containing the IP address, except for the size of
the tuple and that it contains integers in the correct
range.</p>
<p>The reason for the change is that validation could
cause the following sequence of calls to fail:</p>
<p><c>{ok,Addr} = inet:getaddr(localhost, inet6), gen_tcp:connect(Addr, 7, [inet6])</c></p>
<p>Own Id: OTP-5743</p>
</item>
</list>
</section>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p>The previously undocumented and UNSUPPORTED <c>zlib</c>
module has been updated in an incompatible way and many
bugs have been corrected. It is now also documented.</p>
<p>*** POTENTIAL INCOMPATIBILITY ***</p>
<p>Own Id: OTP-5715</p>
</item>
<item>
<p>Added <c>application</c> interface functions
<c>which_applications/1</c>, <c>set_env/4</c> and
<c>unset_env/3</c>, which take an additional
<c>Timeout</c> argument. To be used in situations where
the standard gen_server timeout (5000ms) is not adequate.</p>
<p>Own Id: OTP-5724 Aux Id: seq10083</p>
</item>
<item>
<p>Improved documentation regarding synchronized start of
applications with included applications (using start
phases and <c>application_starter</c>).</p>
<p>Own Id: OTP-5754</p>
</item>
<item>
<p>New socket options <c>priority</c> and <c>tos</c> for
platforms that support them (currently only Linux).</p>
<p>Own Id: OTP-5756</p>
</item>
<item>
<p>The global name server has been optimized when it comes
to maintaining a fully connected network.</p>
<p>Own Id: OTP-5770</p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.10.10.1</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>The native resolver has gotten an control API for
extended debugging and soft restart. It is:
<c>inet_gethost_native:control(Control)</c> <br></br>
<c>Control = {debug_level,Level} | soft_restart</c> <br></br>
<c>Level = integer() in the range 0-4</c>.</p>
<p>Own Id: OTP-5751 Aux Id: EABln25013</p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.10.10</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>If several processes (at the same node) simultaneously
tried to start the same distributed application, this
could lead to <c>application:start</c> returning an
erroneous value, or even hang.</p>
<p>Own Id: OTP-5606 Aux Id: seq9838</p>
</item>
</list>
</section>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p>The manual pages for most of the Kernel and some of
the STDLIB modules have been updated, in particular
regarding type definitions.</p>
<p>The documentation of the return value for
<c>erts:info/1</c> has been corrected.</p>
<p>The documentation for <c>erlang:statistics/1</c> now
lists all possible arguments.</p>
<p>Own Id: OTP-5360</p>
</item>
<item>
<p>When the native resolver fails a <c>gethostbyaddr</c>
lookup, <c>nxdomain</c> should be returned. There should be
no attempt to fallback on a routine that succeeds if only
the syntax of the IP address is valid. This has been fixed.</p>
<p>Own Id: OTP-5598 Aux Id: OTP-5576</p>
</item>
<item>
<p>Replaced some tuple funs with the new <c>fun M:F/A</c>
construct.</p>
<p>The high-order functions in the <c>lists</c> module no
longer accept bad funs under any circumstances.
'<c>lists:map(bad_fun, [])</c>' used to return
'<c>[]</c>' but now causes an exception.</p>
<p>Unused, broken compatibility code in the <c>ets</c>
module was removed. (Thanks to Dialyzer.)</p>
<p>Eliminated 5 discrepancies found by Dialyzer in the
Appmon application.</p>
<p>Own Id: OTP-5633</p>
</item>
<item>
<p>The possibility to have comments following the list of
tuples in a config file (file specified with
the <c>-config</c> flag) has been added.</p>
<p>Own Id: OTP-5661 Aux Id: seq10003</p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.10.9</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>'<c>erl -config sys.config</c>' would fail to start if
the <c>sys.config</c> file did not contain any whitespace
at all after the dot. (Thanks to Anders Nygren.)</p>
<p>Own Id: OTP-5543</p>
</item>
<item>
<p>A bug regarding tcp sockets which results in hanging
<c>gen_tcp:send/2</c> has been corrected. To encounter
this bug you needed one process that read from a socket,
one that wrote more date than the reader read out so the
sender got suspended, and then the reader closed the
socket. (Reported and diagnosed by Alexey Shchepin.)</p>
<p>Corrected a bug in the (undocumented and unsupported)
option <c>{packet,http}</c> for <c>gen_tcp.</c>
(Thanks to Claes Wikstrom and Luke Gorrie.)</p>
<p>Updated the documentation regarding the second argument to
<c>gen_tcp:recv/2</c>, the <c>Length</c> to receive.</p>
<p>Own Id: OTP-5582 Aux Id: seq9839</p>
</item>
</list>
</section>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p>At startup, the Erlang resolver hosts table was used to
look up the name of the local (and possibly stand alone)
host. This was incorrect. The configured resolver method
is now used for this purpose.</p>
<p>Own Id: OTP-5393</p>
</item>
<item>
<p>The <c>erlang:port_info/1</c> BIF is now documented. Minor
corrections of the documentation for
<c>erlang:port_info/2</c>.</p>
<p>Added a note to the documentation of the <c>math</c> module
that all functions are not available on all platforms.</p>
<p>Added more information about the <c>+c</c> option in
the <c>erl</c> man page in the ERTS documentation.</p>
<p>Own Id: OTP-5555</p>
</item>
<item>
<p>The new <c>fun M:F/A</c> construct creates a fun that
refers to the latest version of <c>M:F/A.</c> This syntax is
meant to replace tuple funs <c>{M,F}</c> which have many
problems.</p>
<p>The new type test <c>is_function(Fun,A)</c> (which may be
used in guards) test whether <c>Fun</c> is a fun that can be
applied with <c>A</c> arguments. (Currently, <c>Fun</c> can
also be a tuple fun.)</p>
<p>Own Id: OTP-5584</p>
</item>
<item>
<p>According to the documentation <c>global</c> implements
the equivalent of <c>register/2</c>, which returns
<c>badarg</c> if a process is already registered. As it
turns out there is no check in <c>global</c> if a process is
registered under more than one name. If some process is
accidentally or by design given several names, it is
possible that the name registry becomes inconsistent due
to the way the resolve function is called when name
clashes are discovered (see <c>register_name/3</c> in
<c>global(3)</c>).</p>
<p>In OTP R11B <c>global</c> will not allow the registration of
a process under more than one name. To help finding code
where <c>no</c> will be returned, a Kernel application
variable, <c>global_multi_name_action</c>, is hereby
introduced. Depending on its value (<c>info</c>,
<c>warning</c>, or <c>error</c>), messages are sent to
the error logger when <c>global</c> discovers that some
process is given more than one name. The variable only
affects the node where it is defined.</p>
<p>Own Id: OTP-5603</p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.10.8</title>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p>In case of a DNS lookup loop, <c>inet_db:getbyname</c> ends
up building an infinite list. This has been fixed.</p>
<p>Own Id: OTP-5449</p>
</item>
<item>
<p>When doing an <c>inet6</c> name lookup on an IPv4 address
it was possible to get an address on IPv4 format back. This
has been corrected. Some other minor inconsistencies
regarding IPv6 name lookup have also been corrected.</p>
<p>Own Id: OTP-5576</p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.10.7</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>Under certain circumstances the <c>net_kernel</c> could
emit spurious nodedown messages. This bug has been fixed.</p>
<p>Own Id: OTP-5396</p>
</item>
<item>
<p>Removed description of the <c>keep_zombies</c>
configuration parameter in the <c>kernel</c> man page.</p>
<p>Own Id: OTP-5497</p>
</item>
</list>
</section>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p>Eliminated Dialyzer warnings (caused by dead code) in
the <c>init</c> and <c>prim_file</c> modules.</p>
<p>Own Id: OTP-5496</p>
</item>
<item>
<p><c>inet_config</c> now also checks the environment variable
<c>ERL_INETRC</c> for a possible user configuration file.
See the ERTS User's Guide for details.</p>
<p>Own Id: OTP-5512</p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.10.6</title>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p>The <c>c</c> option for the <c>+B</c> flag has been
introduced which makes it possible to use Ctrl-C
(Ctrl-Break on Windows) to interrupt the shell process
rather than to invoke the emulator break handler. All new
<c>+B</c> options are also supported on Windows (werl) as
of now. Furthermore, Ctrl-C on Windows has now been
reserved for copying text (what Ctrl-Ins was used for
previously). Ctrl-Break should be used for break handling.
Lastly, the documentation of the system flags has been
updated.</p>
<p>Own Id: OTP-5388</p>
</item>
<item>
<p>The possibility to start the Erlang shell in parallel
with the rest of the system was reintroduced for backwards
compatibility in STDLIB 1.13.1. The flag to be used for
this is now called <c>async_shell_start</c> and has
been documented. New shells started from the JCL menu are
not synchronized with <c>init</c> anymore. This makes it
possible to start a new shell (e.g. for debugging purposes)
even if the initial shell has not come up.</p>
<p>Own Id: OTP-5406 Aux Id: OTP-5218</p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.10.5</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>Documentation for <c>erlang:binary_to_float/1</c> deleted.
The BIF itself was removed several releases ago.</p>
<p>Updated documentation for <c>apply/2</c> and
<c>apply/3</c>.</p>
<p>Own Id: OTP-5391</p>
</item>
</list>
</section>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p><c>net_kernel:monitor_nodes/2</c> which takes a flag and an
option list has been added. By use of
<c>net_kernel:monitor_nodes/2</c> one can subscribe for
<c>nodeup/nodedown</c> messages with extra information. It
is now possible to monitor hidden nodes, and get
<c>nodedown</c> reason. See the <c>net_kernel(3)</c>
documentation for more information.</p>
<p>Own Id: OTP-5374</p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.10.4</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>The application master for an application now terminates
the application faster, which reduces the risk for
timeouts in other parts of the system.</p>
<p>Own Id: OTP-5363 Aux Id: EABln19084</p>
</item>
<item>
<p>A BIF <c>erlang:raise/3</c> has been added. See the manual
for details. It is intended for internal system programming
only, advanced error handling.</p>
<p>Own Id: OTP-5376 Aux Id: OTP-5257</p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.10.3</title>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p>With the <c>-eval</c> flag (<c>erl -eval Expr</c>), an
arbitrary expression can be evaluated during system
initialization. This is documented in <c>init(3)</c>.</p>
<p>Own Id: OTP-5260</p>
</item>
<item>
<p>The unsupported and undocumented modules <c>socks5</c>,
<c>socks5_auth</c>, <c>socks5_tcp</c>, and <c>socks5_udp</c>
have been removed.</p>
<p>Own Id: OTP-5266</p>
</item>
</list>
</section>
</section>
<section>
<title>Kernel 2.10.1</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>The Pman 'trace shell' functionality was broken and has
now been fixed. Furthermore, Pman could not correctly
find the pid of the active shell if more than one shell
process was running on the node. This has also been
corrected.</p>
<p>Own Id: OTP-5191</p>
</item>
<item>
<p>The documentation for the <c>auth:open/1</c> function
which no longer exists has been removed. (Thanks to
Miguel Barreiro.)</p>
<p>Own Id: OTP-5208</p>
</item>
<item>
<p>Corrected the <c>crc32/3</c> function in the undocumented
and unsupported <c>zlib</c> module.</p>
<p>Own Id: OTP-5227</p>
</item>
</list>
</section>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p>You can now start Erlang with the <c>-rsh</c> flag which
gives you a remote initial shell instead of a local one.
Example:</p>
<pre>
erl -sname this_node -rsh other_node@other_host
</pre>
<p>Own Id: OTP-5210</p>
</item>
<item>
<p>If <c>/etc/hosts</c> specified two hosts with the same IP
address (on separate lines), only the last host would be
registered by inet_db during inet configuration. This has
been corrected now so that both aliases are registered
with the same IP address.</p>
<p>Own Id: OTP-5212 Aux Id: seq7128</p>
</item>
<item>
<p>The documentation for BIFs that take I/O lists have
been clarified. Those are <c>list_to_binary/1</c>,
<c>port_command/2</c>, <c>port_control/3</c>.</p>
<p>Documentation for all <c>is_*</c> BIFs (such as
<c>is_atom/1</c>) has been added.</p>
<p>Removed the documentation for
<c>erlang:float_to_binary/2</c> which was removed from
the run-time system several releases ago.</p>
<p>Own Id: OTP-5222</p>
</item>
</list>
</section>
</section>
</chapter>
