update from texinfo

[gnulib.git] / lib / sockets.c

diff --git a/lib/sockets.c b/lib/sockets.c
index cbec12d..9d5c547 100644 (file)
--- a/lib/sockets.c
+++ b/lib/sockets.c
@@ -22,9 +22,55 @@
 /* Specification.  */
 #include "sockets.h"
 
+#if WINDOWS_SOCKETS
+
 /* This includes winsock2.h on MinGW. */
 #include <sys/socket.h>
 
+#include "close-hook.h"
+
+/* Get set_winsock_errno, FD_TO_SOCKET etc. */
+#include "w32sock.h"
+
+static int
+close_fd_maybe_socket (int fd, const struct close_hook *remaining_list)
+{
+  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 (fd, remaining_list);
+}
+
+static struct close_hook close_sockets_hook;
+
+#endif
+
 int
 gl_sockets_startup (int version)
 {
@@ -38,6 +84,8 @@ gl_sockets_startup (int version)
 
   if (data.wVersion < version)
     return 2;
+
+  register_close_hook (close_fd_maybe_socket, &close_sockets_hook);
 #endif
 
   return 0;
@@ -49,6 +97,8 @@ gl_sockets_cleanup (void)
 #if WINDOWS_SOCKETS
   int err;
 
+  unregister_close_hook (&close_sockets_hook);
+
   err = WSACleanup ();
   if (err != 0)
     return 1;