GUACAMOLE-597: Add flag for forcing automatic flushing of pipe stream.

src/terminal/terminal.c

@@ -1551,6 +1551,10 @@ void guac_terminal_flush(guac_terminal* terminal) {
     if (terminal->typescript != NULL)
         guac_terminal_typescript_flush(terminal->typescript);
 
+    /* Flush pipe stream if automatic flushing is enabled */
+    if (terminal->pipe_stream_flags & GUAC_TERMINAL_PIPE_AUTOFLUSH)
+        guac_terminal_pipe_stream_flush(terminal);
+
     /* Flush display state */
     guac_terminal_select_redraw(terminal);
     guac_terminal_commit_cursor(terminal);

src/terminal/terminal/terminal.h

@@ -105,6 +105,14 @@
  */
 #define GUAC_TERMINAL_PIPE_INTERPRET_OUTPUT 1
 
+/**
+ * Flag which forces the open pipe stream to be flushed automatically, whenever
+ * a new frame would be rendered, with only minimal buffering performed between
+ * frames. By default, the contents of the pipe stream will be flushed only
+ * when the buffer is full or the pipe stream is being closed.
+ */
+#define GUAC_TERMINAL_PIPE_AUTOFLUSH 2
+
 typedef struct guac_terminal guac_terminal;
 
 /**
@@ -228,6 +236,7 @@ struct guac_terminal {
      * are undefined.
      *
      * @see GUAC_TERMINAL_PIPE_INTERPRET_OUTPUT
+     * @see GUAC_TERMINAL_PIPE_AUTOFLUSH
      */
     int pipe_stream_flags;
 
@@ -942,6 +951,7 @@ int guac_terminal_next_tab(guac_terminal* term, int column);
  *     stream.
  *
  *     @see GUAC_TERMINAL_PIPE_INTERPRET_OUTPUT
+ *     @see GUAC_TERMINAL_PIPE_AUTOFLUSH
  */
 void guac_terminal_pipe_stream_open(guac_terminal* term, const char* name,
         int flags);