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+.\"	$NetBSD: setreuid.2,v 1.23 2008/05/02 18:11:05 martin Exp $
+.\"
+.\" Copyright (c) 1998, 2000, 2001 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Charles M. Hannum.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\"
+.\" Copyright (c) 1980, 1991 The Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     from: @(#)setreuid.2	6.4 (Berkeley) 3/10/91
+.\"
+.Dd January 5, 2001
+.Dt SETREUID 2
+.Os
+.Sh NAME
+.Nm setreuid
+.Nd set real and effective user ID's
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn setreuid "uid_t ruid" "uid_t euid"
+.Sh DESCRIPTION
+.Bf -symbolic
+This interface is made obsolete by the saved ID functionality in
+.Xr setuid 2
+and
+.Xr seteuid 2 .
+.Ef
+.Pp
+The real and effective user ID's of the
+current process are set according to the arguments.
+If the real user ID is changed, the saved user ID is changed to the new
+value of the effective user ID.
+.Pp
+If
+.Fa ruid
+or
+.Fa euid
+is \-1, the current uid is filled in by the system.
+Unprivileged users may change the real user
+ID to the effective user ID, and may change the effective user ID to the
+real user ID or the saved user ID; only the super-user may
+make other changes.
+.Pp
+The
+.Fn setreuid
+function has been used to swap the real and effective user
+IDs in set-user-ID programs to temporarily relinquish the set-user-ID
+value.
+This purpose is now better served by the use of the
+.Fn seteuid
+function (see
+.Xr setuid 2 ) .
+.Pp
+When setting the real and effective user IDs to the same value, this
+function is equivalent to the
+.Fn setuid
+function.
+When setting only the effective user ID, this function is equivalent to
+the
+.Fn seteuid
+function.
+.Sh RETURN VALUES
+Upon successful completion, a value of 0 is returned.
+Otherwise, a value of \-1 is returned and
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er EPERM
+The current process is not the super-user and a change
+other than changing the effective user-id to the real user-id
+was specified.
+.El
+.Sh SEE ALSO
+.Xr getuid 2 ,
+.Xr seteuid 2 ,
+.Xr setgid 2 ,
+.Xr setuid 2
+.Sh HISTORY
+The
+.Fn setreuid
+function call appeared in
+.Bx 4.2 .
+An incompatible version was implemented in
+.Bx 4.4 .
+It was reimplemented in
+.Nx 1.2
+in a way compatible with
+.Bx 4.3 ,
+SunOS and Linux, but should not be used in new code.