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Diffstat (limited to 'man2/listen.2')
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diff --git a/man2/listen.2 b/man2/listen.2 deleted file mode 100644 index 482314357..000000000 --- a/man2/listen.2 +++ /dev/null @@ -1,155 +0,0 @@ -.\" Copyright (c) 1983, 1991 The Regents of the University of California. -.\" and Copyright (C) 2007, Michael Kerrisk <mtk.manpages@gmail.com> -.\" All rights reserved. -.\" -.\" SPDX-License-Identifier: BSD-4-Clause-UC -.\" -.\" $Id: listen.2,v 1.6 1999/05/18 14:10:32 freitag 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> -.\" -.\" -.TH listen 2 (date) "Linux man-pages (unreleased)" -.SH NAME -listen \- listen for connections on a socket -.SH LIBRARY -Standard C library -.RI ( libc ", " \-lc ) -.SH SYNOPSIS -.nf -.B #include <sys/socket.h> -.PP -.BI "int listen(int " sockfd ", int " backlog ); -.fi -.SH DESCRIPTION -.BR listen () -marks the socket referred to by -.I sockfd -as a passive socket, that is, as a socket that will -be used to accept incoming connection requests using -.BR accept (2). -.PP -The -.I sockfd -argument is a file descriptor that refers to a socket of type -.B SOCK_STREAM -or -.BR SOCK_SEQPACKET . -.PP -The -.I backlog -argument defines the maximum length -to which the queue of pending connections for -.I sockfd -may grow. -If a connection request arrives when the queue is full, the client -may receive an error with an indication of -.B ECONNREFUSED -or, if the underlying protocol supports retransmission, the request may be -ignored so that a later reattempt at connection succeeds. -.SH RETURN VALUE -On success, zero is returned. -On error, \-1 is returned, and -.I errno -is set to indicate the error. -.SH ERRORS -.TP -.B EADDRINUSE -Another socket is already listening on the same port. -.TP -.B EADDRINUSE -(Internet domain sockets) -The socket referred to by -.I sockfd -had not previously been bound to an address and, -upon attempting to bind it to an ephemeral port, -it was determined that all port numbers in the ephemeral port range -are currently in use. -See the discussion of -.I /proc/sys/net/ipv4/ip_local_port_range -in -.BR ip (7). -.TP -.B EBADF -The argument -.I sockfd -is not a valid file descriptor. -.TP -.B ENOTSOCK -The file descriptor -.I sockfd -does not refer to a socket. -.TP -.B EOPNOTSUPP -The socket is not of a type that supports the -.BR listen () -operation. -.SH STANDARDS -POSIX.1-2008. -.SH HISTORY -POSIX.1-2001, 4.4BSD -(first appeared in 4.2BSD). -.SH NOTES -To accept connections, the following steps are performed: -.RS 4 -.IP (1) 5 -A socket is created with -.BR socket (2). -.IP (2) -The socket is bound to a local address using -.BR bind (2), -so that other sockets may be -.BR connect (2)ed -to it. -.IP (3) -A willingness to accept incoming connections and a queue limit for incoming -connections are specified with -.BR listen (). -.IP (4) -Connections are accepted with -.BR accept (2). -.RE -.PP -The behavior of the -.I backlog -argument on TCP sockets changed with Linux 2.2. -Now it specifies the queue length for -.I completely -established sockets waiting to be accepted, -instead of the number of incomplete connection requests. -The maximum length of the queue for incomplete sockets -can be set using -.IR /proc/sys/net/ipv4/tcp_max_syn_backlog . -When syncookies are enabled there is no logical maximum -length and this setting is ignored. -See -.BR tcp (7) -for more information. -.PP -If the -.I backlog -argument is greater than the value in -.IR /proc/sys/net/core/somaxconn , -then it is silently capped to that value. -Since Linux 5.4, the default in this file is 4096; -in earlier kernels, the default value is 128. -Before Linux 2.4.25, this limit was a hard coded value, -.BR SOMAXCONN , -with the value 128. -.\" The following is now rather historic information (MTK, Jun 05) -.\" Don't rely on this value in portable applications since BSD -.\" (and some BSD-derived systems) limit the backlog to 5. -.SH EXAMPLES -See -.BR bind (2). -.SH SEE ALSO -.BR accept (2), -.BR bind (2), -.BR connect (2), -.BR socket (2), -.BR socket (7) |