initgroups - initialize group access list
Initgroups reads through the group file and sets up, using the set-
groups(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.
Initgroups returns -1 if it was not invoked by the super-user.
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.
Noone seems to keep /etc/group up to date.
4th Berkeley Distribution 25 February 1983 INITGROUPS(3X)