listen(2)							System Calls Manual							 listen(2)

NAME

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

SYNOPSIS

       #include <sys/socket.h>
       int listen (	 int socket,	  int backlog );

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       listen():  XNS5.0

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS

       Specifies the unique name for the socket.  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  indicated by the SOMAXCONN value in the  sys/socket.h  header
       file.

       The socket in use may require that the process have appropriate privileges to use the listen() function.

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: The requested address is protected and the current process
       does  not  have	permission to access it.  The socket parameter is not valid.  The socket is not bound to a local address, and the protocol
       does not support listening on an unbound socket.  The socket is already connected; or the socket is shut down.  Insufficient resources  are
       available  in  the  system to complete the call.  The socket parameter refers to a file, not a socket.  The referenced socket is not a type
       that supports the listen() function.

RELATED INFORMATION

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

       Standards: standards(5) delim off

																	 listen(2)