INITGROUPS(3) - man page online | library functions

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 underlying system call
              setgroups(2).

FILES
       /etc/group          group database file

ATTRIBUTES
       For an explanation of the terms used in this section, see attributes(7).

       ┌─────────────┬───────────────┬────────────────┐
       │Interface    │ Attribute     │ Value          │
       ├─────────────┼───────────────┼────────────────┤
       │initgroups() │ Thread safety │ MT-Safe locale │
       └─────────────┴───────────────┴────────────────┘

CONFORMING TO
       SVr4, 4.3BSD.

SEE ALSO
       getgroups(2), setgroups(2), credentials(7)

COLOPHON
       This page is part of release 4.04 of the Linux man-pages project.  A description of the
       project, information about reporting bugs, and the latest version of this page, can be
       found at http://www.kernel.org/doc/man-pages/.

GNU                                         2015-03-29                              INITGROUPS(3)