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SETREGID(2)		    BSD System Calls Manual		   SETREGID(2)

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
     This interface is made obsolete by the saved ID functionality in
     setgid(2) and setegid(2).

     The real and effective group ID's of the current process are set accord‐
     ing 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() func‐
     tion.

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.

BSD				January 5, 2001				   BSD

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