NAME
setregid —
set real and effective group
ID's
LIBRARY
Standard C Library (libc, -lc)
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
getgid(2),
setegid(2),
setgid(2),
setuid(2)
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.