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Add an option that atomically tests for the existence of a file and
creates it if the file does not exist, by passing the O_EXCL flag
to open() on Unix and CREATE_NEW flag on Windows. Support for O_EXCL
varies across platforms and filesystems.
{ok, Fd} = file:open("/tmp/foo", [write,exclusive]),
{error, eexist} = file:open("/tmp/foo", [write,exclusive]).
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* pan/otp_8611_standard_io:
Teach file:write/read/read_line about named io_servers
OTP-8611 file:write,read and read_line on named io_device()
The file module's functions write,read and read_line now handles named
io_servers like 'standard_io' and 'standard_error' correctly.
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* pan/otp_3626_win_find_executable:
Teach os.erl to find executable names with extension (i.e. .exe) on windows
OTP-3626 os:find_executable bug on Windows
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").
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* am/net_kernel_catchall:
Add catch all handle_call to net_kernel
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* rn/resolver-leaking-ports:
Resolver: make inet_dns decode ugly truncated reply
Resolver: stop inet_res leaking ports
OTP-8652 inet_res leaking ports
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.
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Of the core networking apps only net_kernel fails to have a catchall
for unknown gen_server:call messages causing it to exit and eventually
bring down kernal_sup and beam if it had not been manually started.
For stability and consistancy it has been altered to include a
catchall which does not reply.
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Under certain circumstances the net kernel could hang. (Thanks to Scott
Lystig Fritchie.)
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* bg/dist_utils:
dist_utils: Eliminate crash when list_to_existing_atom/1 fails
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Bugfix: a DNS reply with the truncation bit set containing
misleading section length (i.e header claimed length greater
than what was actually in the reply section) in the header
caused decode error in inet_dns.
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Bugfix: when all nameservers return a reply causing decode errors
or when errors enetunreach or econnrefused occured while
contacting them, one or two UDP ports was leaked i.e
left open and forgotten.
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In the following scenario list_to_existing_atom/1 may crash
during handshake:
Start a node in one window:
erl -sname adam@localhost
Start another node in another window:
erl -sname bertil
In this node, ping the first node (use the actual hostname
in the command):
net:ping(adam@hostname).
There will be an error report similar to:
=ERROR REPORT==== 27-May-2010::15:03:14 ===
Error in process <0.40.0> on node 'bertil@hostname' with exit value: {badarg,[{erlang,list_to_existing_atom,
["adam@localhost"]},{dist_util,recv_challenge,1},{dist_util,handshake_we_started,1}]}
Eliminate the crash and the error report by catching the call to
list_to_existing_atom/1 and do a clean shutdown if it fails.
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When exchanging groups between nodes pg2 did not remove duplicated members.
This bug was introduced in R13B03 (kernel-2.13.4).
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* fm/file-operations:
Update preloaded modules
Add file:advise/4 - a wrapper to the POSIX syscall posix_fadvise
Add file:datasync/1 for syncing file contents only
sys.h: Correct the get_int64() macro
OTP-8637 fm/file-operations
The functions file:advise/4 and file:datasync/1 have been added. (Thanks to
Filipe David Manana.)
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Useful for informing the Operating System about the access pattern
for a file's data, so that it can adapt the caching strategy to
maximize disk IO performance.
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file:datasync/1 invokes the POSIX system call "int fdatasync(int fd)".
This system call is similar to "fsync" but, unlike fsync, it does not
update the metadata associated with the file (like the access time for
example). It's used by many DBMSs (MySQL and SQLite of example) to
increase disk IO performance, as it avoids disk seeks and disk write
operations compared to fsync.
More details on it at:
http://linux.die.net/man/2/fdatasync
An example, from the MySQL source:
http://bazaar.launchpad.net/~mysql/mysql-server/mysql-5.1-telco-6.1/annotate/head%3A/mysys/my_sync.c#L61
This new function just calls fsync on systems not implementing fdatasync.
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* dp/shell-line-editing:
Readline-style line edit history
OTP-8635 dp/shell-line-editing
The shell's line editing has been improved to more resemble the behaviour
of readline and other shells. (Thanks to Dave Peticolas)
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* bg/file-del_dir:
Adjust test of file:del_dir("..") to accept {error,einval}
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On FreeBSD, file:del_dir("..") will return {error,einval} rather
than the expected {error,eexist}, and so will file:del_dir("../.."),
and so on.
It could be argued that we should change the implementation of
file:del_dir/1 to remap the error code (as some other error codes
are remapped to reduce the differences between different platforms),
but the consistency gained does not seem to be worth the effort.
Therefore, until we'll find a real-world use case where it is
essential to have consistent error codes for file:del_dir("..") on
all platforms, change the test case to accept both errors.
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* ks/kernel:
kernel: Clean up as suggested by tidier
OTP-8606 ks/kernel
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erl_prim_loader:list_dir/1 returns error on failure and not
{error,_}.
Also update tests in code_SUITE:clash/1.
Defect was introduced with fix for listing .ez archives in 49da83de4b.
Initial code:clash/0 tests added in 79194d5fa7.
Signed-off-by: Tuncer Ayaz <[email protected]>
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* jb/inet6-dist:
Support IPv6 addresses in long host names
Fix implementation of IPv6 TCP distribution protocol
Fix compilation of epmd with IPv6 enabled
OTP-8575 jb/inet6-dist
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When distributing over IPv4, node@<IPv4-address>
(e.g. [email protected]) works correctly.
Permit node@<IPv6-address> (e.g. node@::1) when
distributing over IPv6.
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* mh/doc-inet-getopts:
Doc fix: inet:getopts/2 returns {ok, OptionValues}, not just OptionValues
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TCP distribution over IPv6 did not work. The TCP socket
was forcibly closed before any communication could take place.
The following changes resolve this:
* Make the kernel use the inet6 variant of accept.
* Use inet6 variants of TCP socket functions.
* Ensure that the inet6 address family is used in all cases.
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As of this version, the global name server no longer supports nodes running
Erlang/OTP R11B.
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* ml/documentation_apostrophe_fix:
Correct grammatical problems in conjunction with 'its'
Change all incorrect occurrences of it's to its
OTP-8523 ml/documentation_apostrophe_fix
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The documentation (*.xml) in the otp tree has a common grammatical
problem, "it's" and "its" are often interchanged. That is annoying
for some readers.
This commit consists entirely of "it's" -> "its" changes. I went
through every .xml file in the tree. If there are any remaining
bugs of this type, it's because I missed them, not because I
didn't look.
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A race condition in os:cmd/1 could cause the caller to get stuck in
os:cmd/1 forever.
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Change the shell's line buffer mechanism to more
closely match readline-based shells. New behavior:
1. Blank lines are not added to the line buffer.
2. Pressing the down arrow on the last line causes no change.
The previous behavior erased the line.
3. The new line is temporarily added to the line buffer
so the user can move to previous lines with up arrows
and then back to the new line with down arrows.
The previous behavior discarded the partially written
new line.
4. Changes made to previous lines while exploring the line
buffer history are preserved.
The previous behavior discarded changes made to older lines.
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* ks/types:
file.hrl: Move out type declarations
kernel: Add types and specs
OTP-8494 ks/types
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Having various type declarations in the file.hrl file was once upon a time
necessary since the system could not really handle remote types. Now it can
and these declarations should not be there but appear in file.erl instead.
This means that files that need to use these types can refer to them using
a remote type reference, and not having to include file.hrl - at least not
for this reason.
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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).
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* mp/hipe_unified_loader:
hipe_unified_loader: only block SMP scheduling when necessary
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* rani/inet_gethostbyname_fixes:
inet_res_SUITE: testcase fixes for legacy DNS resolver (Solaris 8)
inet_res: /etc/resolv.conf: use domain as default search list
inet: delayed/avoided read of /etc/resolv.conf and /etc/hosts
inet_gethost_native: workaround for empty result hostname on MacOS X
inet_res_SUITE: testcase fix for empty domain name
inet:gethostbyname improved to parse IP strings and look up own hostname
OTP-8426 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.
The resolver routines now tries to parse the hostname as an IP
string as most OS resolvers do, unless the native resolver is
used.
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.
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.
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When the search list option in /etc/resolv.conf was empty, the
domain option was not used as default search domain.
That has been fixed in this patch.
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