[Dovecot] running imap command line

[Anil]

I don't think I am hitting the NGROUPS_MAX, my limits.h shows it to be 16.

# groups
root other bin sys adm uucp mail tty lp nuucp daemon

Thats less than 16.

I think the setgroups() used in Dovecot is failing because of this error:

     EINVAL          The value of gidsetsize is non-zero and less
                     than  the  number of supplementary group IDs
                     set for the calling process.

What does that mean?


 	if (setgroups(gid_count, gid_list) < 0) {
		if (errno == EINVAL) {
			i_fatal("setgroups(%s) failed: Too many extra groups",
				extra_groups == NULL ? "" : extra_groups);
		} else {
			i_fatal("setgroups() failed: %m");
		}
 	}


On Jan 5, 2008 11:07 AM, Bill Cole
<dovecot-20061108 at billmail.scconsult.com> wrote:
>
> At 9:39 AM -0800 1/5/08, Anil wrote:
> >I am trying to debug some core dump problems. I should be able to run
> >imap by itself right? How to fix?
> >
> ># ./imap
> >imap(root): Fatal: setgroups() failed: Too many extra groups
> >
> >I am using latest nightly code.
>
> That error indicates that the root account is a member of too many
> groups to use the setgroups() system call, at least after Dovecot
> adds its mail_extra_groups list. Typically systems control that limit
> with the NGROUPS_MAX or kern.ngroups kernel parameter (depending on
> the heritage of the specific OS) and the traditional limit is 16,
> with some systems defaulting to 32. Some systems are held to 32 as an
> absolute limit.
>
> Some programs deal with that limit by truncating the list of groups
> provided to setgroups() but that can be a tricky business.
>
>
> --
> Bill Cole
> bill at scconsult.com
>
>