NAME

       setregid — set real and effective group ID

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 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

       getgid(2), issetugid(2), setegid(2), setgid(2), setuid(2)

HISTORY

       The setregid() system call appeared in 4.2BSD.

Debian                                           April 16, 1994                                      SETREGID(2)