.\" Copyright (c) 1983, 1991 The Regents of the University of California.
.\" All rights reserved.
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.\" modification, are permitted provided that the following conditions
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.\"    notice, this list of conditions and the following disclaimer in the
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.\"    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.
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" 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
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.\"     $Id: listen.2,v 1.4 2001/05/19 02:09:20 hanataka Exp $
.\"
.\" Modified Fri Jul 23 22:07:54 1993 by Rik Faith <faith@cs.unc.edu>
.\" 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>
.\" Modified 1998 by Andi Kleen 
.\" Modified 11 May 2001 by Sam Varshavchik <mrsam@courier-mta.com>
.\"
.\" Japanese Version Copyright (c) 1998 Shinya HANATAKA, Takeshi Hakamada
.\"         all rights reserved.
.\" Translated Fri Apr 6 14:54:32 JST 1998 
.\"         by Shinya HANATAKA <shinya@abyss.rim.or.jp>
.\"            Takeshi Hakamada <hakamada@nsg.sgi.com>
.\" Modified Tue Jan 13 01:07:46 JST 2000
.\"         by Kentaro Shirakata <argrath@yo.rim.or.jp>
.\" Modified Sat May 19 10:15:29 JST 2001
.\"         by Shinya HANATAKA <shinya@abyss.rim.or.jp>
.\"
.\"WORD:	socket			å
.\"WORD:	listen			ƻ
.\"WORD:	queue			塼
.\"WORD:	descriptor		ǥץ
.\"
.TH LISTEN 2 "23 July 1993" "BSD Man Page" "Linux Programmer's Manual"
.SH ̾
listen \- å(socket)³Ԥ
.SH 
.B #include <sys/socket.h>
.sp
.BI "int listen(int " sockfd ", int " backlog );
.SH 
³դ뤿ˡåȤϺǽ
.BR socket (2)
롣

äƤ³ΤΥ塼κĹ
.BR listen ()
ˤäƻꤵ줿ȡ³
.BR accept (2)
ˤäƼդ롣
.BR listen ()

.B SOCK_STREAM
ޤ
.BR SOCK_SEQPACKET
ΥåȤΤߤŬѤǤ롣
.PP
.I backlog
ϡα³Υ塼ĥ뤳ȤΤǤĹꤹ롣
塼äѤξ֤³׵᤬夹ȡ饤Ȥ
.B ECONNREFUSED
Ȥ顼롣ؤΥץȥ뤬򥵥ݡ
ƤС׵̵뤵졢ȥ饤뤫⤷ʤ
.SH 
TCP åȤǤ
.I backlog
ο񤤤 Linux 2.2 ѹ줿
ߤǤϤΰϡ
դΤԤäƤ롢
.I 
Ω줿åȤΥ塼Ĺꤹ롣
Դ³׵οǤä֤
ԴʥåȤΥ塼κĹ
sysctl ؿ
.B tcp_max_syn_backlog
ѤƥåȤ롣
syncookie ͭˤʤäƤ硢
Ū˺Ÿߤ
sysctl ؿˤ̵뤵롣
.SH ֤
ˤ0֤顼ˤ \-1֤
.I errno
Ŭڤꤹ롣
.SH 顼
.TP
.B EADDRINUSE
̤ΥåȤƱݡȤ listen Ƥ롣
.TP
.B EBADF

.I sockfd
ͭʥǥץǤϤʤ
.TP
.B ENOTSOCK

.I sockfd
ϥåȤǤϤʤ
.TP
.B EOPNOTSUPP
åȤ
.BR listen ()
ݡȤƤ뷿ǤϤʤ
.SH 
4.4BSD, POSIX.1-2001.
.BR listen ()
ؿ 4.2BSDǽƼ줿
.SH Х
åȤ 
.BR AF_INET
Ǥꡢ
.I backlog

.B SOMAXCONN 
 (Linux 2.0  2.2 Ǥ 128)
礭Сbacklog ϰۤΤ
.BR SOMAXCONN
ڤͤ롣
.\" ʲϡǤϸŤǤ롣(MTK, Jun 05)
.\" BSD (ȡĤ BSD ƥ)Ǥ backlog  5 
.\" ¤ƤΤǡܿθץꥱǤ
.\"  (SOMAXCONN) äƤϤʤ
.SH Ϣ
.BR accept (2),
.BR bind (2),
.BR connect (2),
.BR socket (2)