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

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

     listen -- listen for connections on a socket

     Standard C Library (libc, -lc)

     #include <sys/socket.h>

     listen(int s, int backlog);

     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.

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

     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().

     accept(2), connect(2), socket(2)

     The listen() function call appeared in 4.2BSD.

     The backlog is currently limited (silently) to 128.

BSD					December 11, 1993				      BSD
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