#40897 [Asn->Csd]: error_log file not locked

From: Date: Sun, 01 Apr 2007 19:29:48 +0000
Subject: #40897 [Asn->Csd]: error_log file not locked
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-110997@lists.php.net to get a copy of this message 
 ID:               40897
 Updated by:       iliaa@php.net
 Reported By:      david at acz dot org
-Status:           Assigned
+Status:           Closed
 Bug Type:         Filesystem function related
 Operating System: Any
 PHP Version:      5.2.1
 Assigned To:      iliaa
 New Comment:

This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
Thank you for the report, and for helping us make PHP better.




Previous Comments:
------------------------------------------------------------------------

[2007-03-26 14:17:38] david at acz dot org

O_APPEND is atomic for a single write.  php_log_err uses stdio, so a
log entry longer than the stdio buffer size will cause non-atomic
writes.

Try this:

for x in A B; do php -r
'ini_set("error_log","/tmp/test.log");for($i=0;$i<10000;$i++)error_log(str_repeat("'$x'",5000));'
& done

------------------------------------------------------------------------

[2007-03-25 14:22:20] iliaa@php.net

Append is atomic and does not require locking.

------------------------------------------------------------------------

[2007-03-22 20:39:21] david at acz dot org

Description:
------------
The internal php_log_err function does not lock the output file.  This
causes long messages to get mixed together.



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