Implemented NtSignalAndWaitForSingleObject.

diff --git a/server/sock.c b/server/sock.c
index f3f27fc..7fcb406 100644
--- a/server/sock.c
+++ b/server/sock.c
@@ -107,6 +107,7 @@
     remove_queue,                 /* remove_queue */
     sock_signaled,                /* signaled */
     no_satisfied,                 /* satisfied */
+    no_signal,                    /* signal */
     sock_get_fd,                  /* get_fd */
     sock_destroy                  /* destroy */
 };