ws2_32: Finish an overlapped send only if we sent everything.

dlls/ws2_32/socket.c

@@ -1806,7 +1806,11 @@ static NTSTATUS WS2_async_send(void* user, IO_STATUS_BLOCK* iosb, NTSTATUS statu
 
         if (result >= 0)
         {
-            status = STATUS_SUCCESS;
+            if (wsa->first_iovec < wsa->n_iovecs)
+                status = STATUS_PENDING;
+            else
+                status = STATUS_SUCCESS;
+
             iosb->Information += result;
         }
         else if (errno == EINTR || errno == EAGAIN)
@@ -3906,10 +3910,10 @@ static int WS2_sendto( SOCKET s, LPWSABUF lpBuffers, DWORD dwBufferCount,
         wsa->completion_func = lpCompletionRoutine;
         release_sock_fd( s, fd );
 
-        if (n == -1)
+        if (n == -1 || n < totalLength)
         {
             iosb->u.Status = STATUS_PENDING;
-            iosb->Information = 0;
+            iosb->Information = n == -1 ? 0 : n;
 
             SERVER_START_REQ( register_async )
             {

dlls/ws2_32/tests/sock.c

@@ -2848,10 +2848,8 @@ static void test_send(void)
 
     bytes_sent = 0;
     ret = WSASend(dst, &buf, 1, &bytes_sent, 0, &ov, NULL);
-    todo_wine ok((ret == SOCKET_ERROR && GetLastError() == ERROR_IO_PENDING) || broken(bytes_sent == buflen),
+    ok((ret == SOCKET_ERROR && GetLastError() == ERROR_IO_PENDING) || broken(bytes_sent == buflen),
        "Failed to start overlapped send %d - %d - %d/%d\n", ret, WSAGetLastError(), bytes_sent, buflen);
-    if ( (ret != SOCKET_ERROR || GetLastError() != ERROR_IO_PENDING) && bytes_sent < buflen )
-        goto end;
 
     /* don't check for completion yet, we may need to drain the buffer while still sending */
     set_blocking(src, FALSE);