#47227 [Opn->Bgs]: children forked with pcntl_fork release flock()s created by parent
| From: | jani@php.net | Date: | Wed, 28 Jan 2009 08:44:52 +0000 |
| Subject: | #47227 [Opn->Bgs]: children forked with pcntl_fork release flock()s created by parent | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-133255@lists.php.net to get a copy of this message | ||
ID: 47227
Updated by: jani@php.net
Reported By: murphyk at yahoo-inc dot com
-Status: Open
+Status: Bogus
Bug Type: PCNTL related
Operating System: RHEL 4.4
PHP Version: 5.2.8
New Comment:
RTFM:
man 2 flock
man 2 fork
The behaviour is exactly how it should be and is.
Previous Comments:
------------------------------------------------------------------------
[2009-01-27 22:07:47] murphyk at yahoo-inc dot com
Description:
------------
The behavior of flock()ed files across forks appears to have changed
between php 4.4.8 and php 5.2.8.
Previously, children would inherit filehandles from their parent, and
would close() their copies of the filehandles on exit, but this would
not clear flock()s on the files locked in the parent.
Now, it appears that if any child exits(), this will clear flock()s on
any filehandles inherited from the parent.
Reproduce code:
---------------
<?php
$fp = fopen("/tmp/lock.txt", "w+");
if (flock($fp, LOCK_EX + LOCK_NB )) {
print "Got lock.\n";
} else {
print "Couldn't lock the file.\n";
exit();
}
$pid = pcntl_fork();
if ($pid) {
pcntl_waitpid($pid,$status);
}
else {
exit();
}
sleep(100);
?>
Expected result:
----------------
$ php flock.php &
[1] 22054
$ Got lock.
$ php flock.php
Couldn't lock the file.
Actual result:
--------------
$php flock.php &
[1] 31085
$Got lock.
$php flock.php
Got lock.
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=47227&edit=1