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. If the real group ID is changed, the saved group ID is changed to the new value of the effective group ID.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 argument.
The
setregid()
system call 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 system call did not work correctly, and its purpose is now better
served by the use of the
setegid(2) system call.
When setting the real and effective group IDs to the
same value, the standard
setgid()
system call 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.