    NAME
           accept - accept a connection on a socket

    SYNOPSIS
           #include <network.h>

           int accept(int s, struct sockaddr *addr, int *addrlen);

    DESCRIPTION
           The  argument  s  is  a  socket that has been created with
           socket(2), bound to an address with bind(2), and  is  lis-
           tening  for  connections  after  a  listen(2).  The accept
           function extracts the  first  connection  request  on  the
           queue  of  pending  connections, creates a new socket with
           the same  properties  of  s,  and  allocates  a  new  file
           descriptor  for the socket.  If no pending connections are
           present on the queue, and the socket is not marked as non-
           blocking,  accept  blocks the caller until a connection is
           present.  If the socket  is  marked  non-blocking  and  no
           pending  connections  are  present  on  the  queue, accept
           returns an error as described below.  The socket  returned
           by accept may not be used to accept more connections.  The
           original socket s remains open.

           The argument addr is a result parameter that is filled  in
           with the address of the connecting entity, as known to the
           communications layer.  The exact format of the addr param-
           eter  is  determined by the domain in which the communica-
           tion is occurring.  addrlen is a  value-result  parameter:
           it should initially contain the amount of space pointed to
           by addr; on return it will contain the actual  length  (in
           bytes)  of  the  address returned.  This call is used with
           connection-based socket types, currently with SOCK_STREAM.

           It  is  possible to select(2) a socket for the purposes of
           doing an accept by selecting it for read.

           For certain protocols which require an explicit  confirma-
           tion,  such  as DECNet, accept can be thought of as merely
           dequeuing the next connection  request  and  not  implying
           confirmation.   Confirmation  can  be  implied by a normal
           read or write on the new file  descriptor,  and  rejection
           can  be  implied by closing the new socket. Currently only
           DECNet has these semantics on Linux.

    NOTES
           If you want accept to never  block  the  listening  socket
           needs  to  have  the  non blocking flag set. Assuming that
           there is always a connection waiting after select returned
           true  is  not  reliable,  because  the connection might be
           removed by  an  asynchronous  network  error  between  the
           select/poll returning and the accept call. The application
           would hang then if the listen socket is not non  blocking.

    RETURN VALUES
           The  call returns -1 on error.  If it succeeds, it returns
           a non-negative  integer  that  is  a  descriptor  for  the
           accepted socket.

    ERRORS
           EBADF   The descriptor is invalid.

           ENOTSOCK
                   The descriptor references a file, not a socket.

           EOPNOTSUPP
                   The referenced socket is not of type  SOCK_STREAM.

           EAGAIN  The socket is marked non-blocking and  no  connec-
                   tions are present to be accepted.

           ENOBUFS, ENOMEM
                   Not enough free memory.