NAME
setregid —
set real and effective group
ID
LIBRARY
library “libc”
SYNOPSIS
#include
<unistd.h>
int
setregid(gid_t
rgid, gid_t
egid);
DESCRIPTION
The real and effective group ID's of the current process are set to the arguments. Unprivileged users may change the real group ID to the effective group ID and vice-versa; only the super-user may make other changes.Supplying a value of -1 for either the real or effective group ID forces the system to substitute the current ID in place of the -1 parameter.
The
setregid()
function was intended to allow swapping the real and effective group IDs in
set-group-ID programs to temporarily relinquish the set-group-ID value. This
function did not work correctly, and its purpose is now better served by the
use of the
setegid()
function (see
setuid(2)).
When setting the real and effective group IDs to the
same value, the standard
setgid()
function is preferred.
RETURN VALUES
The setregid() function returns the
value 0 if successful; otherwise the value -1 is returned and
the global variable errno is set to indicate the
error.
ERRORS
- [
EPERM] - The current process is not the super-user and a change other than changing the effective group-id to the real group-id was specified.
SEE ALSO
HISTORY
The setregid() system call appeared in
4.2BSD.