initgroups (3)

NAME

       initgroups - initialize the supplementary group access list

SYNOPSIS

       #include <grp.h>
       #include <sys/types.h>

       int initgroups(const char *user, gid_t group);

DESCRIPTION

       The  initgroups() function initializes the group access list by reading
       the group database /etc/group and using all groups of which user  is  a
       member.  The additional group group is also added to the list.

RETURN VALUE

       The  initgroups()  function  returns  0  on  success, or -1 if an error
       occurs.

ERRORS

       EPERM  The calling process does not have sufficient privileges.

       ENOMEM Insufficient memory to allocate group information structure.

FILES

       /etc/group          group database file

CONFORMING TO

       SVID 3, BSD 4.3

NOTES

       The prototype for  initgroups  is  only  available  if  _BSD_SOURCE  is
       defined   (either   explicitly,   or   implicitly,   by   not  defining
       _POSIX_SOURCE or compiling with the -ansi flag).

SEE ALSO

       getgroups(2), setgroups(2)

GNU                               1993-04-05                     initgroups(3)