From b3f1a958ce613f304234ecb6506976db26c117dc Mon Sep 17 00:00:00 2001
From: "Evgeny Grin (Karlson2k)" <k2k@narod.ru>
Date: Sat, 26 Nov 2016 15:18:48 +0300
Subject: Fixed sending on Linux responses backed with file which is not
 supported by sendfile()

---
 src/microhttpd/connection.c | 11 +++++++++--
 src/microhttpd/daemon.c     |  3 ++-
 src/microhttpd/internal.h   |  8 ++++++++
 3 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/src/microhttpd/connection.c b/src/microhttpd/connection.c
index 186e9dd2..e6a26efc 100644
--- a/src/microhttpd/connection.c
+++ b/src/microhttpd/connection.c
@@ -681,8 +681,7 @@ try_ready_normal_body (struct MHD_Connection *connection)
 	connection->response_write_position) )
     return MHD_YES; /* response already ready */
 #if LINUX
-  if ( (MHD_INVALID_SOCKET != response->fd) &&
-       (0 == (connection->daemon->options & MHD_USE_TLS)) )
+  if (MHD_resp_sender_sendfile == connection->resp_sender)
     {
       /* will use sendfile, no need to bother response crc */
       return MHD_YES;
@@ -3488,6 +3487,14 @@ MHD_queue_response (struct MHD_Connection *connection,
   MHD_increment_response_rc (response);
   connection->response = response;
   connection->responseCode = status_code;
+#if LINUX
+  if ( (response->fd == -1) ||
+       (0 != (connection->daemon->options & MHD_USE_TLS)) )
+    connection->resp_sender = MHD_resp_sender_std;
+  else
+    connection->resp_sender = MHD_resp_sender_sendfile;
+#endif /* LINUX */
+
   if ( ( (NULL != connection->method) &&
          (MHD_str_equal_caseless_ (connection->method,
                                    MHD_HTTP_METHOD_HEAD)) ) ||
diff --git a/src/microhttpd/daemon.c b/src/microhttpd/daemon.c
index 6e97085b..1b0a42bb 100644
--- a/src/microhttpd/daemon.c
+++ b/src/microhttpd/daemon.c
@@ -1852,7 +1852,7 @@ send_param_adapter (struct MHD_Connection *connection,
   if ( (connection->write_buffer_append_offset ==
 	connection->write_buffer_send_offset) &&
        (NULL != connection->response) &&
-       (-1 != (fd = connection->response->fd)) )
+       (MHD_resp_sender_sendfile == connection->resp_sender) )
     {
       /* can use sendfile */
       uint64_t left;
@@ -1904,6 +1904,7 @@ send_param_adapter (struct MHD_Connection *connection,
 	 to fall back to 'SEND'; see also this thread for info on
 	 odd libc/Linux behavior with sendfile:
 	 http://lists.gnu.org/archive/html/libmicrohttpd/2011-02/msg00015.html */
+      connection->resp_sender = MHD_resp_sender_std;
     }
 #endif
   ret = MHD_send_ (connection->socket_fd,
diff --git a/src/microhttpd/internal.h b/src/microhttpd/internal.h
index ae63e79c..d92f76a1 100644
--- a/src/microhttpd/internal.h
+++ b/src/microhttpd/internal.h
@@ -752,6 +752,14 @@ struct MHD_Connection
    */
   uint64_t response_write_position;
 
+#if LINUX
+  enum MHD_resp_sender_
+  {
+    MHD_resp_sender_std = 0,
+    MHD_resp_sender_sendfile
+  } resp_sender;
+#endif /* LINUX */
+
   /**
    * Position in the 100 CONTINUE message that
    * we need to send when receiving http 1.1 requests.
-- 
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