LISTEN(2)           RISC/os Reference Manual            LISTEN(2)



NAME
     listen - listen for connections on a socket

SYNOPSIS
     For -systype sysv and -systype bsd43:

     listen(s, backlog)
     int s, 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 VALUE
     A 0 return value indicates success; -1 indicates an error.

ERRORS
     The call fails if:

     [EBADF]             The argument s is not a valid descrip-
                         tor.

     [ENOTSOCK]          The argument s is not a socket.

     [EOPNOTSUPP]        The socket is not of a type that sup-
                         ports the operation listen.

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

BUGS
     The backlog is currently limited (silently) to 5.

NOTE
     When these routines are used in a program which is compiled
     in -systype sysv, they are not resolved by libc.a.  See
     intro(3-SysV) for more information.







                         Printed 1/15/91                   Page 1