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.\" Copyright (c) 1983, 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. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. 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.
.\"
.\" @(#)setregid.2 6.4 (Berkeley) 3/10/91
.\"
.\" Modified Sat Jul 24 09:08:49 1993 by Rik Faith (faith@cs.unc.edu)
.\" Portions extracted from linux/kernel/sys.c:
.\" Copyright (C) 1991, 1992 Linus Torvalds
.\" May be distributed under the GNU General Public License
.\" Changes: Fri Jul 29 10:56:01 BST 1994 by Wilf. (G.Wilford@ee.surrey.ac.uk)
.\" Tue Aug 2 14:56:48 BST 1994 by Wilf due to change in kernel.
.\"
.\" Traduction 15/10/1996 par Christophe Blaess (ccb@club-internet.fr)
.\" Mise a Jour 8/04/97
.TH SETREUID 2 "8 Avril 1997" Linux "Manuel du programmeur Linux"
.SH NOM
setreuid, seteuid \- Fixer l'UID reel ou effectif.
.SH SYNOPSIS
.B #include <unistd.h>
.sp
.BI "int setreuid(uid_t " ruid ", uid_t " euid );
.br
.BI "int seteuid(uid_t " euid );
.SH DESCRIPTION
.B setreuid
fixe les UID reel et effectif du processus en cours.
Les utilisateurs non\-privilegies peuvent changer
leur UID reel pour l'UID effectif et inversement.
Depuis Linux 1.1.37, il est egalement possible de
fixer l'UID effectif a la valeur de l'UID sauve.
Seul le Super\-User peut effectuer d'autres changements.
Fournir une valeur \-1 pour l'un ou l'autre des UID reel ou effectif
conduit le systeme a laisser cet UID inchange.
Actuellement (libc-4.x.x),
.BI seteuid( euid )
est fonctionnellement equivalent a
.BI setreuid( -1 , " euid" ).
Si l'UID reel est change, ou si l'UID effectif est positionne a une valeur
differente de l'ID reel precedent, l'UID sauve va prendre la valeur
du nouvel UID effectif.
.SH "VALEUR RENVOYEE"
.BR setreuid " et " seteuid
renvoient zero s'ils reussissent, et \-1 s'ils echouent, auquel cas
.I errno
contient le code d'erreur.
.SH ERREURS
.TP 0.8i
.TP
.B EPERM
le processus en cours n'est pas Super\-User et d'autres changement que
.br
(i) l'echange des UID effectif et reel,
.br
(ii) positionner l'un des UID a la valeur de l'autre,
ou
.br
(iii) placer l'UID effectif a la valeur de l'UID sauve,
ont ete demandes.
.SH "CONFORMITE"
BSD 4.3. Cette fonction est apparue dans BSD 4.2.
.SH "VOIR AUSSI"
.BR getuid "(2), " setuid (2)
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