NAME
setregid —
set real and effective group
ID's
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 according to the arguments. If the real group ID is changed, the saved group ID is changed to the new value of the effective group ID.
If rgid or egid is -1, the current gid is filled in by the system. Unprivileged users may change the real group ID to the effective group ID, and may change the effective group ID to the real group ID or the saved group ID; only the super-user may make other changes.
The
setregid()
function has been used to swap the real and effective group IDs in
set-group-ID programs to temporarily relinquish the set-group-ID value. This
purpose is now better served by the use of the
setegid()
function (see setgid(2)).
When setting the real and effective group IDs to the
same value, this function is equivalent to the
setgid()
function. When setting only the effective group ID, this function is
equivalent to the
setegid()
function.
RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and 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() function call appeared in
4.2BSD. An incompatible version was implemented in
4.4BSD. It was reimplemented in
NetBSD 1.2 in a way compatible with
4.3BSD, SunOS and Linux, but should not be used in
new code.