ws2_32: Support indefinite receive timeouts.

dlls/ws2_32/socket.c

@@ -3303,7 +3303,7 @@ int WINAPI WS_setsockopt(SOCKET s, int level, int optname,
                 tval.tv_usec = (*(const UINT32*)optval % 1000) * 1000;
                 tval.tv_sec = *(const UINT32*)optval / 1000;
                 /* min of 500 milliseconds */
-                if (tval.tv_sec == 0 && tval.tv_usec < 500000)
+                if (tval.tv_sec == 0 && tval.tv_usec && tval.tv_usec < 500000)
                     tval.tv_usec = 500000;
                 optlen = sizeof(struct timeval);
                 optval = (char*)&tval;

dlls/ws2_32/tests/sock.c

@@ -986,6 +986,15 @@ static void test_set_getsockopt(void)
         err = getsockopt(s, SOL_SOCKET, SO_RCVTIMEO, (char *) &timeout, &size); 
     ok( !err, "get/setsockopt(SO_RCVTIMEO) failed error: %d\n", WSAGetLastError());
     ok( timeout == SOCKTIMEOUT1, "getsockopt(SO_RCVTIMEO) returned wrong value %d\n", timeout);
+
+    timeout = 0;
+    size = sizeof(timeout);
+    err = setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, (char *) &timeout, size);
+    if( !err)
+        err = getsockopt(s, SOL_SOCKET, SO_RCVTIMEO, (char *) &timeout, &size);
+    ok( !err, "get/setsockopt(SO_RCVTIMEO) failed error: %d\n", WSAGetLastError());
+    ok( timeout == 0, "getsockopt(SO_RCVTIMEO) returned wrong value %d\n", timeout);
+
     /* SO_SNDTIMEO */
     timeout = SOCKTIMEOUT2; /* 997 seconds. See remark above */
     size = sizeof(timeout);