Name
setgid — set group identity
DESCRIPTION
setgid() sets the effective
group ID of the current process. If the caller is the
superuser, the real GID and saved set-group-ID are also
set.
Under Linux, setgid() is
implemented like the POSIX version with the _POSIX_SAVED_IDS
feature. This allows a set-group-ID program that is not
set-user-ID-root to drop all of its group privileges, do some
un-privileged work, and then re-engage the original effective
group ID in a secure manner.
RETURN VALUE
On success, zero is returned. On error, −1 is
returned, and errno is set
appropriately.
ERRORS
- EPERM
-
The calling process is not privileged (does not have
the CAP_SETGID capability), and gid does not match the
effective group ID or saved set-group-ID of the calling
process.
CONFORMING TO
SVr4, POSIX.1-2001.
SEE ALSO
getgid(2), setegid(2), setregid(2), capabilities(7), credentials(7)
Copyright (C), 1994, Graeme W. Wilford. (Wilf.)
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manual page may be incorrect or out-of-date.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.
Fri Jul 29th 12:56:44 BST 1994 Wilf. <G.Wilford@ee.surrey.ac.uk>
Modified 1997-01-31 by Eric S. Raymond <esr@thyrsus.com>
Modified 2002-03-09 by aeb
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