listen(2)							    listen(2)



NAME

  listen - Listens for socket connections and limits the backlog of incoming
  connections

SYNOPSIS

  int listen (
	  int socket,
	  int backlog );

PARAMETERS

  socket    Specifies the unique name for the socket.

  backlog   Specifies the maximum number of outstanding connection requests.

DESCRIPTION

  The listen() function identifies the socket that receives the connections,
  marks the socket as accepting connections, and limits the number (backlog)
  of outstanding connection requests in the system queue.

  The maximum queue length (backlog) that the listen() function can specify
  is eight.  The maximum queue length is indicated by the SOMAXCONN value in
  the sys/socket.h header file.

RETURN VALUES

  Upon successful completion, the listen() function returns a value of 0
  (zero).  Otherwise, a value of -1 is returned and errno is set to indicate
  the error.

ERRORS

  If the listen() function fails, errno may be set to one of the following
  values:

  [EBADF]   The socket parameter is not valid.

  [ENOTSOCK]
	    The socket parameter refers to a file, not a socket.

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

RELATED INFORMATION

  Functions: accept(2), connect(2), socket(2) delim off