Content-type: text/html Man page of listen

listen

Section: Sockets Library Functions (3SOCKET)
Updated: 8 Nov 1999
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NAME

listen - listen for connections on a socket  

SYNOPSIS

cc [ flag ... ] file ... -lsocket -lnsl [ library ... ]
#include <sys/types.h>
#include <sys/socket.h>

int listen(int s, int backlog);  

DESCRIPTION

To accept connections, a socket is first created with socket(3SOCKET), a backlog for incoming connections is specified with listen() and then the connections are accepted with accept(3SOCKET). The listen() call applies only to sockets of type SOCK_STREAM or SOCK_SEQPACKET.

The backlog parameter defines the maximum length the queue of pending connections may grow to.

If a connection request arrives with the queue full, the client will receive an error with an indication of ECONNREFUSED for AF_UNIX sockets. If the underlying protocol supports retransmission, the connection request may be ignored so that retries may succeed. For AF_INET and AF_INET6sockets, the TCP will retry the connection. If the backlog is not cleared by the time the tcp times out, the connect will fail with ETIMEDOUT.  

RETURN VALUES

A 0 return value indicates success; -1 indicates an error.  

ERRORS

The call fails if:

EBADF The argument s is not a valid file descriptor.

ENOTSOCK The argument s is not a socket.

EOPNOTSUPP The socket is not of a type that supports the operation listen().

 

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
MT-LevelSafe

 

SEE ALSO

accept(3SOCKET), connect(3SOCKET), socket(3SOCKET), attributes(5), socket.h(3HEAD)  

NOTES

There is currently no backlog limit.


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
ERRORS
ATTRIBUTES
SEE ALSO
NOTES

This document was created by man2html, using the manual pages.
Time: 02:38:32 GMT, October 02, 2010