kc3-lang/gnulib/lib/sockets.c

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• Hash : 6829a6c0
  Author :
  Date : 2011-04-25T10:38:33
  

  Revert "use _GL_ATTRIBUTE_CONST and _GL_ATTRIBUTE_PURE"
  
  This reverts commit 349d7fe0e307d59d508b3579317ee8d4eacfeb9c.
  Revert accidentally-pushed patch.  Not yet ready.
  

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• lib/sockets.c

• /* sockets.c --- wrappers for Windows socket functions
  
     Copyright (C) 2008-2011 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  /* Written by Simon Josefsson */
  
  #include <config.h>
  
  /* Specification.  */
  #include "sockets.h"
  
  #if WINDOWS_SOCKETS
  
  /* This includes winsock2.h on MinGW. */
  # include <sys/socket.h>
  
  # include "fd-hook.h"
  
  /* Get set_winsock_errno, FD_TO_SOCKET etc. */
  # include "w32sock.h"
  
  static int
  close_fd_maybe_socket (const struct fd_hook *remaining_list,
                         gl_close_fn primary,
                         int fd)
  {
    SOCKET sock;
    WSANETWORKEVENTS ev;
  
    /* Test whether fd refers to a socket.  */
    sock = FD_TO_SOCKET (fd);
    ev.lNetworkEvents = 0xDEADBEEF;
    WSAEnumNetworkEvents (sock, NULL, &ev);
    if (ev.lNetworkEvents != 0xDEADBEEF)
      {
        /* fd refers to a socket.  */
        /* FIXME: other applications, like squid, use an undocumented
           _free_osfhnd free function.  But this is not enough: The 'osfile'
           flags for fd also needs to be cleared, but it is hard to access it.
           Instead, here we just close twice the file descriptor.  */
        if (closesocket (sock))
          {
            set_winsock_errno ();
            return -1;
          }
        else
          {
            /* This call frees the file descriptor and does a
               CloseHandle ((HANDLE) _get_osfhandle (fd)), which fails.  */
            _close (fd);
            return 0;
          }
      }
    else
      /* Some other type of file descriptor.  */
      return execute_close_hooks (remaining_list, primary, fd);
  }
  
  static int
  ioctl_fd_maybe_socket (const struct fd_hook *remaining_list,
                         gl_ioctl_fn primary,
                         int fd, int request, void *arg)
  {
    SOCKET sock;
    WSANETWORKEVENTS ev;
  
    /* Test whether fd refers to a socket.  */
    sock = FD_TO_SOCKET (fd);
    ev.lNetworkEvents = 0xDEADBEEF;
    WSAEnumNetworkEvents (sock, NULL, &ev);
    if (ev.lNetworkEvents != 0xDEADBEEF)
      {
        /* fd refers to a socket.  */
        if (ioctlsocket (sock, request, arg) < 0)
          {
            set_winsock_errno ();
            return -1;
          }
        else
          return 0;
      }
    else
      /* Some other type of file descriptor.  */
      return execute_ioctl_hooks (remaining_list, primary, fd, request, arg);
  }
  
  static struct fd_hook fd_sockets_hook;
  
  static int initialized_sockets_version /* = 0 */;
  
  #endif /* WINDOWS_SOCKETS */
  
  int
  gl_sockets_startup (int version _GL_UNUSED)
  {
  #if WINDOWS_SOCKETS
    if (version > initialized_sockets_version)
      {
        WSADATA data;
        int err;
  
        err = WSAStartup (version, &data);
        if (err != 0)
          return 1;
  
        if (data.wVersion < version)
          return 2;
  
        if (initialized_sockets_version == 0)
          register_fd_hook (close_fd_maybe_socket, ioctl_fd_maybe_socket,
                            &fd_sockets_hook);
  
        initialized_sockets_version = version;
      }
  #endif
  
    return 0;
  }
  
  int
  gl_sockets_cleanup (void)
  {
  #if WINDOWS_SOCKETS
    int err;
  
    initialized_sockets_version = 0;
  
    unregister_fd_hook (&fd_sockets_hook);
  
    err = WSACleanup ();
    if (err != 0)
      return 1;
  #endif
  
    return 0;
  }
  

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