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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.
.\"
.\" @(#)listen.2 6.5 (Berkeley) 3/10/91
.\"
.\" Modified Fri Jul 23 22:07:54 1993 by Rik Faith <faith@cs.unc.edu>
.\" Modified Mon Aug 19 10:07:54 1993 by Martin Schulze (joey@debian.org)
.\" Modified 950727 by aeb, following a suggestion by Urs Thuermann
.\" <urs@isnogud.escape.de>
.\" Modified Tue Oct 22 08:11:14 EDT 1996 by Eric S. Raymond <esr@thyrsus.com>
.\" Translated into Spanish Tue Feb 17 15:26:14 CET 1998 by Gerardo
.\" Aburruzaga Garca <gerardo.aburruzaga@uca.es>
.\"
.TH LISTEN 2 "17 Febrero 1998" "BSD" "Manual del Programador de Linux"
.SH NOMBRE
listen \- espera conexiones en un zcalo
.SH SINOPSIS
.B #include <sys/socket.h>
.sp
.BI "int listen(int " s ", int " backlog );
.SH DESCRIPCIN
Para aceptar conexiones, primero se crea un zcalo con
.BR socket (2),
luego se especifica con
.B listen
el deseo de aceptar conexiones entrantes, y un lmite de la cola para
dichas conexiones, y por ltimo las conexiones son aceptadas mediante
.BR accept (2).
La llamada
.B listen
se aplica solamente a zcalos de tipo
.B SOCK_STREAM
o
.BR SOCK_SEQPACKET.
El parmetro
.I backlog
define la longitud mxima a la que puede llegar la cola de conexiones
pendientes. Si una peticin de conexin llega estando la cola llena,
el cliente puede recibir un error con una indicacin de
.BR ECONNREFUSED ,
o, si el protocolo subyacente acepta retransmisiones, la peticin
puede no ser tenida en cuenta, de forma que un reintento pueda llegar
a tener xito.
.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 ERRORS
.TP 0.8i
.B EBADF
El argumento
.I s
no es un descriptor vlido.
.TP
.B ENOTSOCK
El argumento
.I s
no es un zcalo.
.TP
.B EOPNOTSUPP
El zcalo no es de un tipo que admita la operacin
.BR listen .
.SH "CONFORME CON"
SVr4, 4.4BSD (la llamada a funcin
.B listen
apareci por 1 vez en 4.2BSD).
.SH BUGS
Si el zcalo es de tipo af_inet, y el argumento
.I backlog
es mayor que la constante SO_MAXCONN (128 en 2.0.23), se trunca
silenciosamente a SO_MAXCONN. Para aplicaciones transportables, no
confe en este valor puesto que BSD (y algunos sistemas derivados de
BSD) limitan
.I backlog
a 5.
.SH "VASE TAMBIN"
.BR accept "(2), " connect "(2), " socket (2).
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