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102 lines
3.3 KiB
Groff
102 lines
3.3 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)listen.2 8.2 (Berkeley) 12/11/93
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.\"
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.TH LISTEN 2 "16 January 1997" GNO "System Calls"
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.SH NAME
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.BR listen
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\- listen for connections on a socket
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.SH SYNOPSIS
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.br
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#include <sys/socket.h>
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.sp 1
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int
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\fBlisten\fR (int \fIs\fR, int \fIbacklog\fR);
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.SH DESCRIPTION
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To accept connections, a socket
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is first created with
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.BR socket (2),
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a willingness to accept incoming connections and
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a queue limit for incoming connections are specified with
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.BR listen ,
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and then the connections are
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accepted with
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.BR accept (2).
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The
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.BR listen
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call applies only to sockets of type
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.BR SOCK_STREAM
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or
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.BR SOCK_SEQPACKET.
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.LP
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The
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.I backlog
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parameter defines the maximum length the queue of
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pending connections may grow to.
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If a connection
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request arrives with the queue full the client may
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receive an error with an indication of
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ECONNREFUSED,
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or, if the underlying protocol supports retransmission,
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the request may be ignored so that retries may succeed.
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.SH RETURN VALUES
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A 0 return value indicates success; -1 indicates an error.
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.SH ERRORS
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.BR Listen
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will fail if:
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.RS
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.IP \fBEBADF\fR
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The argument
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.I s
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is not a valid descriptor.
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.IP \fBENOTSOCK\fR
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The argument
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.I s
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is not a socket.
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.IP \fBEOPNOTSUPP\fR
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The socket is not of a type that supports the operation
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.BR listen .
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.RE
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.SH SEE ALSO
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.BR accept (2),
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.BR connect (2),
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.BR socket (2)
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.SH BUGS
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The
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.I backlog
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is currently limited (silently) to 32.
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.SH HISTORY
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The
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.BR listen
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function call appeared in 4.2BSD.
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The first appearance in GNO was in v2.0.5.
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