4.4BSD/usr/share/man/cat2/listen.0

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LISTEN(2)                   BSD Programmer's Manual                  LISTEN(2)

NNAAMMEE
     lliisstteenn - listen for connections on a socket

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<ssyyss//ssoocckkeett..hh>>

     _i_n_t
     lliisstteenn(_i_n_t _s, _i_n_t _b_a_c_k_l_o_g);

DDEESSCCRRIIPPTTIIOONN
     To accept connections, a socket is first created with socket(2),  a will-
     ingness to accept incoming connections and a queue limit for incoming
     connections are specified with lliisstteenn(), and then the connections are ac-
     cepted with accept(2).  The lliisstteenn() call applies only to sockets of type
     SOCK_STREAM or SOCK_SEQPACKET.

     The _b_a_c_k_l_o_g 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.

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

EERRRROORRSS
     LLiisstteenn(_w_i_l_l, _f_a_i_l, _i_f_:)

     [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
                   lliisstteenn().

SSEEEE AALLSSOO
     accept(2),  connect(2),  socket(2)

BBUUGGSS
     The _b_a_c_k_l_o_g is currently limited (silently) to 5.

HHIISSTTOORRYY
     The lliisstteenn function call appeared in 4.2BSD.

4.2 Berkeley Distribution        June 4, 1993                                1