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SETREGID(2)		       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 ar-
     guments.  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 ef-
     fective group IDs in set-group-ID programs to  temporarily  relinquish  the
     set-group-ID  value.  This system call did not work correctly, and its pur-
     pose 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  stan-
     dard 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.

FreeBSD ports 15.quarterly	 April 16, 1994 		     SETREGID(2)

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