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	1	.\" Copyright (c) 1980, 1991, 1993, 1994
	2	.\" The Regents of the University of California. All rights reserved.
	3	.\"
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	5	.\" modification, are permitted provided that the following conditions
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	7	.\" 1. Redistributions of source code must retain the above copyright
	8	.\" notice, this list of conditions and the following disclaimer.
	9	.\" 2. Redistributions in binary form must reproduce the above copyright
	10	.\" notice, this list of conditions and the following disclaimer in the
	11	.\" documentation and/or other materials provided with the distribution.
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	13	.\" must display the following acknowledgement:
	14	.\" This product includes software developed by the University of
	15	.\" California, Berkeley and its contributors.
	16	.\" 4. Neither the name of the University nor the names of its contributors
	17	.\" may be used to endorse or promote products derived from this software
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	20	.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	21	.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	22	.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	23	.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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	25	.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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	27	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	28	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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	30	.\" SUCH DAMAGE.
	31	.\"
	32	.\" @(#)setreuid.2 8.2 (Berkeley) 4/16/94
	33	.\" $FreeBSD: src/lib/libc/sys/setreuid.2,v 1.6.2.6 2001/12/14 18:34:01 ru Exp $
	34	.\"
	35	.Dd February 8, 2001
	36	.Dt SETREUID 2
	37	.Os
	38	.Sh NAME
	39	.Nm setreuid
	40	.Nd set real and effective user IDs
	41	.Sh LIBRARY
	42	.Lb libc
	43	.Sh SYNOPSIS
	44	.In unistd.h
	45	.Ft int
	46	.Fn setreuid "uid_t ruid" "uid_t euid"
	47	.Sh DESCRIPTION
	48	The real and effective user IDs of the
	49	current process are set according to the arguments.
	50	If
	51	.Fa ruid
	52	or
	53	.Fa euid
	54	is -1, the current uid is filled in by the system.
	55	Unprivileged users may change the real user
	56	ID to the effective user ID and vice-versa; only the super-user may
	57	make other changes.
	58	.Pp
	59	The
	60	.Fn setreuid
	61	function has been used to swap the real and effective user IDs
	62	in set-user-ID programs to temporarily relinquish the set-user-ID value.
	63	This purpose is now better served by the use of the
	64	.Fn seteuid
	65	function (see
	66	.Xr setuid 2 ) .
	67	.Pp
	68	When setting the real and effective user IDs to the same value,
	69	the standard
	70	.Fn setuid
	71	function is preferred.
	72	.Sh RETURN VALUES
	73	.Rv -std setreuid
	74	.Sh ERRORS
	75	.Bl -tag -width Er
	76	.It Bq Er EPERM
	77	The current process is not the super-user and a change
	78	other than changing the effective user-id to the real user-id
	79	was specified.
	80	.El
	81	.Sh SEE ALSO
	82	.Xr getuid 2 ,
	83	.Xr issetugid 2 ,
	84	.Xr seteuid 2 ,
	85	.Xr setuid 2
	86	.Sh HISTORY
	87	The
	88	.Fn setreuid
	89	system call appeared in
	90	.Bx 4.2 .