note 95223 deleted from function.exec by danbrown
| From: | danbrown@php.net | Date: | Sat, 19 Dec 2009 16:28:24 +0000 |
| Subject: | note 95223 deleted from function.exec by danbrown | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-164135@lists.php.net to get a copy of this message | ||
Note Submitter: klaus dot wendel at lednew dot de
----
I had many problems with exec() in a program, rendering very large images and using some external
tools via exec in a very performance and resources consuming process.
Sometimes the program failed with "Warning: exec(): Unable to fork". In my case it
definitely did not have to do with some process number limit to be set in /etc/security/limits.conf,
as described in http://bugs.php.net/bug.php?id=18833&edit=3.
Furthermore following workaround now does it very well:
<?php
function user_proc_exec ($command,& $result,& $status)
{
$process = proc_open(
$command,
array(
0 => array("pipe", "r"), //STDIN
1 => array("pipe", "w"), //STDOUT
2 => array("pipe","w")), //STDERR
$pipes
);
$result = stream_get_contents($pipes[1]);
$error = stream_get_contents($pipes[2]);
fclose($pipes[1]);
fclose($pipes[2]);
$status= proc_close($process);
return($error);
}
?>
In most cases, exec() could simply be replaced by user_proc_exec(). However be aware, that
user_proc_exec() does not return the last line of output as string, but the error message!