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.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" Copyright (c) 1993 Michael Haardt
.\" (u31b3hs@pool.informatik.rwth-aachen.de)
.\" Fri Apr 2 11:32:09 MET DST 1993
.\"
.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
.\" published by the Free Software Foundation; either version 2 of
.\" the License, or (at your option) any later version.
.\"
.\" The GNU General Public License's references to "object code"
.\" and "executables" are to be interpreted as the output of any
.\" document formatting or typesetting system, including
.\" intermediate and printed output.
.\"
.\" This manual is distributed in the hope that it will be useful,
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
.\" GNU General Public License for more details.
.\"
.\" You should have received a copy of the GNU General Public
.\" License along with this manual; if not, write to the Free
.\" Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
.\" USA.
.\"
.\" Modified Sat Jul 24 15:12:05 1993 by Rik Faith <faith@cs.unc.edu>
.\" Modified Tue Aug 1 16:27 1995 by Jochen Karrer
.\" <cip307@cip.physik.uni-wuerzburg.de>
.\" Modified Tue Oct 22 08:11:14 EDT 1996 by Eric S. Raymond <esr@thyrsus.com>
.\" Translated into Spanish Mon Feb 16 18:48:34 CET 1998 by Gerardo
.\" Aburruzaga Garca <gerardo.aburruzaga@uca.es>
.\"
.TH IOPERM 2 "16 Febrero 1998" "Linux" "Manual del Programador Linux"
.SH NOMBRE
ioperm \- establece permisos en los puertos de entrada/salida
.SH SINOPSIS
.B #include <unistd.h>
.sp
.BI "int ioperm(unsigned long " desde ", unsigned long " num ", int " encender );
.SH DESCRIPCIN
\fBIoperm\fP establece los bits de permiso de acceso a los puertos
para el proceso para \fInum\fP bytes, empezando desde la direccin del
puerto \fBdesde\fP, al valor \fBencender\fP. El empleo de \fBioperm\fP
requiere privilegios de root.
Solamente se pueden especificar de esta manera los primeros 0x3ff
puertos de E/S. Para ms puertos, debe emplearse la funcin
.BR iopl .
Los permisos no se heredan en un fork(), pero s estn en un
exec(). Esto es til para proporcionar permisos de acceso a puertos a
tareas no privilegiadas.
.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 apropiado.
.SH "CONFORME CON"
\fBioperm\fP es especfico de Linux y no debera emplearse en
programas pretendidamente transportables.
.SH "VASE TAMBIN"
.BR iopl (2)
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