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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 changes in kernel.
.\" Translated into Spanish Mon Jan 26 1998 by Gerardo Aburruzaga
.\" Garca <gerardo.aburruzaga@uca.es>
.\"
.TH SETREGID 2 "26 Enero 1998" "Linux 1.1.38" "Manual del Programador Linux"
.SH NOMBRE
setregid, setegid \- establecen el GID efectivo o real
.SH SINOPSIS
.B #include <unistd.h>
.sp
.BI "int setregid(gid_t " rgid ", gid_t " egid );
.br
.BI "int setegid(gid_t " egid );
.SH DESCRIPCIN
.B setregid
establece los GIDs real y efectivo del proceso en curso.
Los usuarios no privilegiados pueden cambiar el GID real al GID
efectivo y viceversa.
Antes de Linux 1.1.38, lo del ID salvado, cuando se usaba con
.B setregid
o
.B setegid
no funcionaba.
A partir del 1.1.38, es posible tambin establecer el GID efectivo a
partir del GID salvado.
Slo el sper-usuario puede hacer otros cambios.
Un valor de \-1 para el GID efectivo o para el real, fuerza al sistema
a dejar ese ID intacto.
Actualmente (libc-4.x.x),
.BI setegid( egid )
es funcionalmente equivalente a
.BI setregid( -1 , " egid" ).
Si el GID real se cambia o el GID efectivo se pone a un valor distinto
del GID real anterior, el GID salvado tomar el valor del nuevo GID
efectivo.
.SH "VALOR DEVUELTO"
En caso de xito se devuelve cero. En caso de error, se devuelve \-1 y
se pone en
.I errno
un valor adecuado.
.SH ERRORES
.TP 0.8i
.TP
.B EPERM
El proceso en curso no es del sper-usuario y se ha especificado un
cambio distinto a
(i) cambiar el GID efectivo con el real, o
(ii) poner uno al valor del otro, o
(iii) poner el GID efectivo al valor del GID salvado.
.SH "CONFORME CON"
BSD 4.3 (la funcin
.B setregid
apareci por primera vez en 4.2BSD).
.SH "VASE TAMBIN"
.BR getgid "(2), " setgid (2)
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