bsd man page for initgroups

INITGROUPS(3)						     Library Functions Manual						     INITGROUPS(3)

NAME
       initgroups - initialize group access list

SYNOPSIS
       initgroups(name, basegid)
       char *name;
       int basegid;

DESCRIPTION
       Initgroups  reads  through  the	group file and sets up, using the setgroups(2) call, the group access list for the user specified in name.
       The basegid is automatically included in the groups list.  Typically this value is given as the group number from the password file.

FILES
       /etc/group

SEE ALSO
       setgroups(2)

DIAGNOSTICS
       Initgroups returns -1 if it was not invoked by the super-user.

BUGS
       Initgroups uses the routines based on getgrent(3).  If the invoking program uses any of these routines, the group structure will  be  over-
       written in the call to initgroups.

4.2 Berkeley Distribution					   May 12, 1986 						     INITGROUPS(3)