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

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	parameter.

     The setregid() function was intended to allow swapping the	real and ef-
     fective group IDs in set-group-ID programs	to temporarily relinquish the
     set-group-ID value.  This function	did not	work correctly,	and its	pur-
     pose is now better	served by the use of the setegid() function (see
     setuid(2)).

     When setting the real and effective group IDs to the same value, the
     standard setgid() function	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.

BSD				April 16, 1994				   BSD

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY

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