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INITGROUPS(3)              Linux Programmer's Manual             INITGROUPS(3)

NAME
       initgroups - initialize the supplementary group access list
SYNOPSIS
       #include <sys/types.h>
       #include <grp.h>
       int initgroups(const char *user, gid_t group);
   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
       initgroups(): _BSD_SOURCE
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  under-
              lying system call setgroups(2).
FILES
       /etc/group          group database file
CONFORMING TO
       SVr4, 4.3BSD.
SEE ALSO
       getgroups(2), setgroups(2), credentials(7)
COLOPHON
       This  page  is  part of release 3.53 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

GNU                               2007-07-26                     INITGROUPS(3)