lib/sockets.c

   1 /* sockets.c --- wrappers for Windows socket functions
   2
   3    Copyright (C) 2008-2010 Free Software Foundation, Inc.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU Lesser General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 /* Written by Simon Josefsson */
  19
  20 #include <config.h>
  21
  22 /* Specification.  */
  23 #include "sockets.h"
  24
  25 #if WINDOWS_SOCKETS
  26
  27 /* This includes winsock2.h on MinGW. */
  28 # include <sys/socket.h>
  29
  30 # include "close-hook.h"
  31
  32 /* Get set_winsock_errno, FD_TO_SOCKET etc. */
  33 # include "w32sock.h"
  34
  35 static int
  36 close_fd_maybe_socket (int fd, const struct close_hook *remaining_list)
  37 {
  38   SOCKET sock;
  39   WSANETWORKEVENTS ev;
  40
  41   /* Test whether fd refers to a socket.  */
  42   sock = FD_TO_SOCKET (fd);
  43   ev.lNetworkEvents = 0xDEADBEEF;
  44   WSAEnumNetworkEvents (sock, NULL, &ev);
  45   if (ev.lNetworkEvents != 0xDEADBEEF)
  46     {
  47       /* fd refers to a socket.  */
  48       /* FIXME: other applications, like squid, use an undocumented
  49          _free_osfhnd free function.  But this is not enough: The 'osfile'
  50          flags for fd also needs to be cleared, but it is hard to access it.
  51          Instead, here we just close twice the file descriptor.  */
  52       if (closesocket (sock))
  53         {
  54           set_winsock_errno ();
  55           return -1;
  56         }
  57       else
  58         {
  59           /* This call frees the file descriptor and does a
  60              CloseHandle ((HANDLE) _get_osfhandle (fd)), which fails.  */
  61           _close (fd);
  62           return 0;
  63         }
  64     }
  65   else
  66     /* Some other type of file descriptor.  */
  67     return execute_close_hooks (fd, remaining_list);
  68 }
  69
  70 static struct close_hook close_sockets_hook;
  71
  72 static int initialized_sockets_version /* = 0 */;
  73
  74 #endif /* WINDOWS_SOCKETS */
  75
  76 int
  77 gl_sockets_startup (int version _GL_UNUSED)
  78 {
  79 #if WINDOWS_SOCKETS
  80   if (version > initialized_sockets_version)
  81     {
  82       WSADATA data;
  83       int err;
  84
  85       err = WSAStartup (version, &data);
  86       if (err != 0)
  87         return 1;
  88
  89       if (data.wVersion < version)
  90         return 2;
  91
  92       if (initialized_sockets_version == 0)
  93         register_close_hook (close_fd_maybe_socket, &close_sockets_hook);
  94
  95       initialized_sockets_version = version;
  96     }
  97 #endif
  98
  99   return 0;
 100 }
 101
 102 int
 103 gl_sockets_cleanup (void)
 104 {
 105 #if WINDOWS_SOCKETS
 106   int err;
 107
 108   initialized_sockets_version = 0;
 109
 110   unregister_close_hook (&close_sockets_hook);
 111
 112   err = WSACleanup ();
 113   if (err != 0)
 114     return 1;
 115 #endif
 116
 117   return 0;
 118 }