+# include <sys/socket.h>
+
+# include "fd-hook.h"
+# include "msvc-nothrow.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)
+{
+ /* Note about multithread-safety: There is a race condition where, between
+ our calls to closesocket() and the primary close(), some other thread
+ could make system calls that allocate precisely the same HANDLE value
+ as sock; then the primary close() would call CloseHandle() on it. */
+ 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 */