[PATCH 2/2] Cygwin: console: Add support for FLUSHO and Ctrl-O.

[Takashi Yano via Cygwin-patches]

- With this patch, FLUSHO and Ctrl-O (VDISCARD) get working.
---
 winsup/cygwin/fhandler_console.cc | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/winsup/cygwin/fhandler_console.cc 
b/winsup/cygwin/fhandler_console.cc
index ca8eb6400..6ded9eabf 100644
--- a/winsup/cygwin/fhandler_console.cc
+++ b/winsup/cygwin/fhandler_console.cc
@@ -259,6 +259,7 @@ fhandler_console::cons_master_thread (handle_set_t *p, tty 
*ttyp)
                    {
                      ttyp->kill_pgrp (sig);
                      ttyp->output_stopped = false;
+                     ti.c_lflag &= ~FLUSHO;
                      /* Discard type ahead input */
                      goto skip_writeback;
                    }
@@ -286,6 +287,13 @@ fhandler_console::cons_master_thread (handle_set_t *p, tty 
*ttyp)
                           && c && i >= output_stopped_at)
                    goto restart_output;
                }
+             if ((ti.c_lflag & ICANON) && (ti.c_lflag & IEXTEN)
+                 && CCEQ (ti.c_cc[VDISCARD], c))
+               {
+                 if (input_rec[i].Event.KeyEvent.bKeyDown)
+                   ti.c_lflag ^= FLUSHO;
+                 processed = true;
+               }
              break;
            case WINDOW_BUFFER_SIZE_EVENT:
              SHORT y = con.dwWinSize.Y;
@@ -3052,6 +3060,9 @@ fhandler_console::write (const void *vsrc, size_t len)
   if (bg <= bg_eof)
     return (ssize_t) bg;
 
+  if (get_ttyp ()->ti.c_lflag & FLUSHO)
+    return len; /* Discard write data */
+
   if (get_ttyp ()->output_stopped && is_nonblocking ())
     {
       set_errno (EAGAIN);
-- 
2.30.0