I found the reason of this issue : SELinux

by defaut, SELinux is enabled on CentOS5.5 => httpd runs with "restricted rights"


If I temporary disabled SELinux + restart httpd => "ps -A" from my script runs as expected
    $ setenforce 0
    $ /etc/init.d/httpd restart



Le 30/01/2013 19:14, patrick ficheux a écrit :
Hi,

I want to get the list of running processes. also, I call exec() with "ps -A"
(ps -A displays almost all processes of all users)
Unfortunatly, the output of "ps -A" seems incomplete

the test file test.php:
<?php
unset($buf);
unset($res);
exec("ps -A", $buf, $res);
for($i=0; $i < count($buf); $i++)
{
    echo($buf[$i]."<br>");
}
?>

If I run the test.php under the context of httpd (from http://<server>/test.php), I can see only a subset of running processes (some processes of user "apache")

PID TTY TIME CMD
3207 ? 00:00:00 httpd
3359 ? 00:00:00 httpd
3360 ? 00:00:00 httpd
3361 ? 00:00:00 httpd
3362 ? 00:00:00 httpd
3363 ? 00:00:00 httpd
3364 ? 00:00:00 httpd
3365 ? 00:00:00 httpd
3366 ? 00:00:00 httpd
3569 ? 00:00:00 ps

If I run the same script directly from php (from user apache) , I can see *all* processes as expected

# sudo -u apache php -f test.php
  PID TTY          TIME CMD<br>
    1 ?        00:00:01 init<br>
    2 ?        00:00:00 migration/0<br>
    3 ?        00:00:00 ksoftirqd/0<br>
    4 ?        00:00:00 watchdog/0<br>
    5 ?        00:00:00 events/0<br>
    6 ?        00:00:00 khelper<br>
[...]

Is it a problem with exec() or with "ps -A" or with .... ?

any ideas ?


more information :
OS = centos 5.5
# httpd -v
Server version: Apache/2.2.3
Server built:   Jan 10 2013 08:22:14
# php -v
PHP 5.3.3 (cli) (built: Jun 27 2012 12:25:37)




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