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From "Arvind Shenoy" <>
Subject Re: [users@httpd] initgroups() failure
Date Thu, 09 Oct 2008 17:21:46 GMT

Thanks for replying. Unfortunately, there are no related messages in System.log also does not raise any red flags. I would really
like to find out (but don't know exactly how to go about it) is whether the
initgroups() call is failing because of not being called by the super-user
or because of something else. I wrote a small C program that called
initgroups and tried calling it when httpd was working correctly as well as
after it had crashed due to the initgroups() failure. In both cases, the
initgroups call in my program returned successfully (0) when the program was
called with a sudo.

The following is a small snippet of the code I threw together:

gid_t *gids, gid;
int ngroups;

gid = (gid_t) <group id>;
int ret = initgroups("<user>", gid);

It may also be important to note that the user and group that I have defined
in Apache are NOT the standard (_)www/(_)www or daemon/daemon users.
However, the user I set httpd to run as, is a member of the group that
apache is running as. Also, the crash occurs regardless of what user/group
combination I use, so I'm not sure if that narrows down the problem at all.

Again, thanks for replying and any thoughts/suggestions would be greatly


On Thu, Oct 9, 2008 at 5:41 AM, Dan Poirier <> wrote:

> Eric Covener said the following on 10/08/2008 10:43 PM:
>> On Wed, Oct 8, 2008 at 10:01 PM, Arvind Shenoy <>
>> wrote:
>>> Hello,
>>> I recently installed httpd-2.2.9 (with LDAP and SSL) on my Mac OS X
>>> 10.5.4
>>> box. Everything went very smoothly except for one thing; Apache keeps
>>> shutting down due to the following initgroups failures:
>>> [Wed Sep 24 19:02:11 2008] [alert] (2)No such file or directory:
>>> initgroups:
>>> unable to set groups for User <user> and Group <gid>
>>> and
>>> [Wed Oct 08 15:00:48 2008] [alert] (22)Invalid argument: initgroups:
>>> unable
>>> to set groups for User <user> and Group <gid>
>> trivia that may help, I've seen initgroups() crash when LDAP is used
>> on linux from nsswitch.conf and Apache is linked with some other LDAP.
>> Does initgroups have anything interesting in the manual your system
>> for those errno values?
> The man page for initgroups on Mac OS X says only:  The initgroups()
> function returns -1 if it was not invoked by the superuser.  But
> looking at the code, there are other possible causes.
> Arvind, have you checked the console for any messages that Mac OS X
> might have logged at the time of the problem?  If directory services
> is having problems, it might log them there.
> (/Applications/Utilities/
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