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NAME

       initgroups - initialize the supplementary group access list

SYNOPSIS

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

       The user argument must be non-NULL.

RETURN VALUE

       The  initgroups()  function  returns  0  on  success.   On error, -1 is
       returned, and errno is set appropriately.

ERRORS

       ENOMEM Insufficient memory to allocate group information structure.

       EPERM  The  calling  process  has  insufficient  privilege.   See   the
              underlying system call setgroups(2).

FILES

       /etc/group          group database file

CONFORMING TO

       SVID 3, 4.3BSD

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)