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NetBSD 6.1.5 - man page for listen (netbsd section 2)

LISTEN(2)			     BSD System Calls Manual				LISTEN(2)

NAME
     listen -- listen for connections on a socket

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <sys/socket.h>

     int
     listen(int s, int backlog);

DESCRIPTION
     To accept connections, a socket is first created with socket(2), a willingness to accept
     incoming connections and a queue limit for incoming connections are specified with listen(),
     and then the connections are accepted with accept(2).  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 may receive an error
     with an indication of ECONNREFUSED, or, if the underlying protocol supports retransmission,
     the request may be ignored so that retries may succeed.

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

ERRORS
     listen() will fail if:

     [EBADF]		The argument s is not a valid descriptor.

     [ENOTSOCK] 	The argument s is not a socket.

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

SEE ALSO
     accept(2), connect(2), socket(2)

HISTORY
     The listen() function call appeared in 4.2BSD.

BUGS
     The backlog is currently limited (silently) to 128.

BSD					December 11, 1993				      BSD


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