Edit report at https://bugs.php.net/bug.php?id=51160&edit=1
ID: 51160
Comment by: mrvanes at gmail dot com
Reported by: poehler at interworx dot com
Summary: Exec family of functions runs a script piped into
'head' too until script end
Status: Not a bug
Type: Bug
Package: *General Issues
Operating System: CentOS 5.4
PHP Version: 5.2.13
Block user comment: N
Private report: N
New Comment:
I must correct: the SIGPIPE sighandler does suppress the message but does not
solve the problem! The command that generates the broken pipe fails.
Previous Comments:
------------------------------------------------------------------------
[2012-05-07 08:39:34] mrvanes at gmail dot com
I was encountering a similar problem too and for some reason Mike's hint
(registering an empty/exit function on the SIGPIPE signal) solved the problem
for
me.
The only problem I now have is racking my brains over WHY?! Is this discussed
somewhere so I can read up on the given solution?
------------------------------------------------------------------------
[2012-01-19 12:26:16] burek021 at gmail dot com
Just to say, my problem somehow got misteriosly solved. I don't know exactly
what was the culprit, but I know I've messed around with ulimit and with
apache2.conf:
<IfModule mpm_prefork_module>
StartServers 5
MinSpareServers 5
MaxSpareServers 100
MaxClients 150
MaxRequestsPerChild 0
</IfModule>
More details here (if needed):
http://www.linuxquestions.org/questions/showthread.php?p=4577927
------------------------------------------------------------------------
[2012-01-18 21:59:26] burek021 at gmail dot com
I also have this issue. I've tried to test a simple example on several of our
web hosting machines and all of them have this issue present.
Simple test. Create a php file (test.php) with this content:
==================
<?php
shell_exec('ls | ls | ls | ls' );
==================
and then run: php -f test.php 2>&1
you should get the error like: ls: write error: Broken pipe
almost every time you run that command.
I'm not sure what's the reason for this, but I'm pretty sure it's the bug,
since the bash/sh doesn't ever raise that error no matter how many ls'es we put
into the pipe.
------------------------------------------------------------------------
[2010-12-07 21:57:02] sirjava at gmail dot com
I'm confused. If the exec family of functions is designed to execute something
as if executed from a shell, and the command executes properly from a shell,
but not in php... how is this not a php bug?
------------------------------------------------------------------------
[2010-05-17 11:21:33] m...@php.net
Sorry, but your problem does not imply a bug in PHP itself. For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system is not the
appropriate forum for asking support questions. Due to the volume
of reports we can not explain in detail here why your report is not
a bug. The support channels will be able to provide an explanation
for you.
Thank you for your interest in PHP.
$ cat 51160.php
<?
pcntl_signal(SIGPIPE, function() { exit; });
passthru ("/bin/sh 51160.sh | head -n1");
------------------------------------------------------------------------
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the rest of the comments, please view the bug report online at
https://bugs.php.net/bug.php?id=51160
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