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SETREGID(2)		  FreeBSD System Calls Manual		   SETREGID(2)

NAME
     setregid -- set real and effective	group IDs

SYNOPSIS
     #include <unistd.h>

     int
     setregid(gid_t rgid, gid_t	egid);

DESCRIPTION
     The real and effective group IDs of the current process are set according
     to	the arguments.	The saved group	ID will	be set to the new value	of the
     real group	ID if a	real group ID is specified and either the new real
     group ID value is different from the current value	or the new value of
     the effective group ID differs from the current saved group ID.

     Unprivileged users	may change either group	ID to the current value	of the
     real, effective, or saved group ID.  Only the superuser 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 purpose is now better served by the use of the
     setegid(2)	function.

     When setting the real and effective group IDs to the same value, the
     setgid(2) function	is preferred.

RETURN VALUES
     Upon successful completion, the value 0 is	returned; 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 superuser 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), setresgid(2), setreuid(2)

STANDARDS
     The setregid() function conforms to the IEEE Std 1003.1-2008 ("POSIX.1")
     specification, except that	the conditions for changing the	saved group ID
     differ and	that, if it is changed,	the saved group	ID is set to the real
     group ID instead of the effective group ID.

HISTORY
     The setregid() system call	first appeared in 4.1cBSD, predating POSIX.  A
     semantically different version appeared in	4.4BSD.	 The current version,
     with the original semantics restored, appeared in OpenBSD 3.3.

FreeBSD	13.0		       February	5, 2015			  FreeBSD 13.0

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

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