From: jaa at interflow dot dk
Operating system: Un*x
PHP version: 5.0.4
PHP Bug Type: Filesystem function related
Bug description: PHP thinks it gets a flock when it doesn't
Description:
------------
flock($fp, LOCK_EX | LOCK_NB) returns true even when $fp is already
locked.
This happens both on FreeBSD 5.4 and Gentoo Linux and both PHP 5.0.2,
5.0.3 and 5.0.4 exhibits this behaviour but PHP 4.3.11 works as expected.
The blocking version: flock($fp, LOCK_EX) works as expected.
The workaround is to check the value of the "wouldblock" argument to
flock() but this shouldn't be necessary and is not documented in the
manual.
Reproduce code:
---------------
<?php
$fp = fopen("/tmp/lock.txt", "w+");
if (flock($fp, LOCK_EX | LOCK_NB )) {
print "Got lock @ ".date('H:i:s');
while(1) {}
} else {
echo "Couldn't lock the file.";
}
fclose($fp);
?>
Expected result:
----------------
When a file is already locked flock($fp, LOCK_EX | LOCK_NB) should return
false.
First terminal:
% ~/php-5.0.4/sapi/cli/php flock.php 15:18:34
Got lock @ 15:18:34
Second terminal:
% ~/php-5.0.4/sapi/cli/php flock.php 15:18:33
Couldn't lock the file.
Actual result:
--------------
First terminal:
% ~/php-5.0.4/sapi/cli/php flock.php 15:18:34
Got lock @ 15:18:34
Second terminal:
% ~/php-5.0.4/sapi/cli/php flock.php 15:18:33
Got lock @ 15:18:37
--
Edit bug report at http://bugs.php.net/?id=33027&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=33027&r=trysnapshot4
Try a CVS snapshot (php5.0):
http://bugs.php.net/fix.php?id=33027&r=trysnapshot50
Try a CVS snapshot (php5.1):
http://bugs.php.net/fix.php?id=33027&r=trysnapshot51
Fixed in CVS: http://bugs.php.net/fix.php?id=33027&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=33027&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=33027&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=33027&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=33027&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=33027&r=support
Expected behavior: http://bugs.php.net/fix.php?id=33027&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=33027&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=33027&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=33027&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=33027&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=33027&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=33027&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=33027&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=33027&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=33027&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=33027&r=mysqlcfg
