W32: shutdown a socket for writing before closing it

Turns out that closing a socket while having unread data in recv buffer
causes winsock to terminate the connection without sending any pending
data.
This is fixed by shutting down socket for writing before closing it.

1 files changed, 8 insertions, 3 deletions

diff --git a/src/microhttpd/daemon.c b/src/microhttpd/daemon.c
index 5d3c47bb..8f85c49a 100644
--- a/src/microhttpd/daemon.c
+++ b/src/microhttpd/daemon.c
@@ -1582,9 +1582,14 @@ MHD_cleanup_connections (struct MHD_Daemon *daemon)
           MHD_destroy_response (pos->response);
           pos->response = NULL;
         }
-      if ( (-1 != pos->socket_fd) &&
-           (0 != CLOSE (pos->socket_fd)) )
-        MHD_PANIC ("close failed\n");
+      if (-1 != pos->socket_fd)
+        {
+#ifdef WINDOWS
+          SHUTDOWN (pos->socket_fd, SHUT_WR);
+#endif
+          if (0 != CLOSE (pos->socket_fd))
+            MHD_PANIC ("close failed\n");
+        }
       if (NULL != pos->addr)
         free (pos->addr);
       free (pos);