Fix a bug about the iSCSI DHCP dependency issue.

[mirror_edk2.git] / StdLib / BsdSocketLib / listen.c

/** @file\r
  Implement the listen API.\r
\r
  Copyright (c) 2011, Intel Corporation\r
  All rights reserved. This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include <SocketInternals.h>\r
\r
\r
/**\r
  Establish the known port to listen for network connections.\r
\r
  The listen routine places the port into a state that enables connection\r
  attempts.  Connections are placed into FIFO order in a queue to be serviced\r
  by the application.  The application calls the ::accept routine to remove\r
  the next connection from the queue and get the associated socket.\r
\r
  The\r
  <a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/listen.html">POSIX</a>\r
  documentation is available online.\r
\r
  @param [in] s         Socket file descriptor returned from ::socket.\r
\r
  @param [in] backlog   backlog specifies the maximum FIFO depth for the connections\r
                        waiting for the application to call ::accept.  Connection attempts\r
                        received while the queue is full are refused.\r
\r
  @return     This routine returns zero (0) if successful or -1 when an error occurs.\r
              In the case of an error, ::errno contains more details.\r
\r
 **/\r
int\r
listen (\r
  IN int s,\r
  IN int backlog\r
  )\r
{\r
  int ListenStatus;\r
  EFI_SOCKET_PROTOCOL * pSocketProtocol;\r
  EFI_STATUS Status;\r
\r
  //\r
  //  Locate the context for this socket\r
  //\r
  pSocketProtocol = BslFdToSocketProtocol ( s, NULL, &errno );\r
  if ( NULL != pSocketProtocol ) {\r
    //\r
    //  Enable connections on the known port\r
    //\r
    Status = pSocketProtocol->pfnListen ( pSocketProtocol,\r
                                          backlog,\r
                                          &errno );\r
  }\r
\r
  //\r
  //  Return the operation stauts\r
  //\r
  ListenStatus = ( 0 == errno ) ? 0 : -1;\r
  return ListenStatus;\r
}\r