*_param_adapter: Distinguish between network error and remote hard close

src/microhttpd/connection.c

@@ -152,8 +152,10 @@ recv_param_adapter (struct MHD_Connection *connection,
         }
       if (MHD_SCKT_ERR_IS_EINTR_ (err))
         return MHD_ERR_AGAIN_;
+      if (MHD_SCKT_ERR_IS_ (err, MHD_SCKT_ECONNRESET_))
+        return MHD_ERR_CONNRESET_;
       /* Treat any other error as hard error. */
-      return MHD_ERR_CONNRESET_;
+      return MHD_ERR_NOTCONN_;
     }
 #ifdef EPOLL_SUPPORT
   else if (i > (size_t)ret)
@@ -204,8 +206,10 @@ send_param_adapter (struct MHD_Connection *connection,
         }
       if (MHD_SCKT_ERR_IS_EINTR_ (err))
         return MHD_ERR_AGAIN_;
+      if (MHD_SCKT_ERR_IS_ (err, MHD_SCKT_ECONNRESET_))
+        return MHD_ERR_CONNRESET_;
       /* Treat any other error as hard error. */
-      return MHD_ERR_CONNRESET_;
+      return MHD_ERR_NOTCONN_;
     }
 #ifdef EPOLL_SUPPORT
   else if (i > (size_t)ret)

src/microhttpd/connection.h

@@ -36,12 +36,13 @@
 #define MHD_ERR_AGAIN_ (-3073)
 
 /**
- * "Connection (remote) reset" error code
+ * Connection was hard-closed by remote peer.
  */
 #define MHD_ERR_CONNRESET_ (-3074)
 
 /**
- * "Not connected" error code
+ * Connection is not connected anymore due to
+ * network error or any other reason.
  */
 #define MHD_ERR_NOTCONN_ (-3075)
 

src/microhttpd/connection_https.c

@@ -73,7 +73,7 @@ recv_tls_adapter (struct MHD_Connection *connection,
       /* Likely 'GNUTLS_E_INVALID_SESSION' (client communication
          disrupted); interpret as a hard error */
       connection->tls_read_ready = false;
-      return MHD_ERR_CONNRESET_;
+      return MHD_ERR_NOTCONN_;
     }
 
 #ifdef EPOLL_SUPPORT
@@ -125,7 +125,7 @@ send_tls_adapter (struct MHD_Connection *connection,
     {
       /* Likely 'GNUTLS_E_INVALID_SESSION' (client communication
          disrupted); interpret as a hard error */
-      return MHD_ERR_CONNRESET_;
+      return MHD_ERR_NOTCONN_;
     }
 #ifdef EPOLL_SUPPORT
   /* If NOT all available data was sent - socket is not write ready anymore. */