Name

initgroups — initialize the supplementary group access list

Synopsis

#include <sys/types.h>
#include <grp.h>
int initgroups( const char *user,
  gid_t group);
 
[Note] Note
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

CONFORMING TO

SVr4, 4.3BSD.

SEE ALSO

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

COLOPHON

This page is part of release 3.52 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/.


  Copyright 1993 David Metcalfe (davidprism.demon.co.uk)

%%%LICENSE_START(VERBATIM)
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.

Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided that the
entire resulting derived work is distributed under the terms of a
permission notice identical to this one.

Since the Linux kernel and libraries are constantly changing, this
manual page may be incorrect or out-of-date.  The author(s) assume no
responsibility for errors or omissions, or for damages resulting from
the use of the information contained herein.  The author(s) may not
have taken the same level of care in the production of this manual,
which is licensed free of charge, as they might when working
professionally.

Formatted or processed versions of this manual, if unaccompanied by
the source, must acknowledge the copyright and authors of this work.
%%%LICENSE_END

References consulted:
    Linux libc source code
    Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
    386BSD man pages
Modified 1993-07-24 by Rik Faith <faithcs.unc.edu>
Modified 2004-10-10 by aeb