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setgid — set group identity
#include <sys/types.h> #include <unistd.h>
int
setgid( |
gid_t gid); |
setgid() sets the effective
group ID of the calling 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
reengage the original effective group ID in a secure
manner.
On success, zero is returned. On error, −1 is
returned, and errno is set
appropriately.
The calling process is not privileged (does not have
the CAP_SETGID
capability), and gid does not match the
real group ID or saved set-group-ID of the calling
process.
The original Linux setgid()
system call supported only 16-bit group IDs. Subsequently,
Linux 2.4 added setgid32()
supporting 32-bit IDs. The glibc setgid() wrapper function transparently
deals with the variation across kernel versions.
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/.
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Copyright (C), 1994, Graeme W. Wilford. (Wilf.) %%%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 Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date.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 Fri Jul 29th 12:56:44 BST 1994 Wilf. <G.Wilfordee.surrey.ac.uk> Modified 1997-01-31 by Eric S. Raymond <esrthyrsus.com> Modified 2002-03-09 by aeb |