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authorErlang/OTP <[email protected]>2011-12-12 18:14:34 +0100
committerErlang/OTP <[email protected]>2011-12-12 18:14:34 +0100
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</header>
<p>This document describes the changes made to the Kernel application.</p>
+<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 Jim�nez )</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>
+ <p>
+ <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>
+ <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>