[newlib-cygwin/cygwin-3_3-branch] Cygwin: console: Fix a bug on input when signalled.

[newlib-cygwin/cygwin-3_3-branch] Cygwin: console: Fix a bug on input when signalled.

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=a4bda4f62652321a78909f31b39b40b4ede5c1c4

commit a4bda4f62652321a78909f31b39b40b4ede5c1c4
Author: Takashi Yano <takashi.yano@nifty.ne.jp>
Date:   Tue Nov 2 12:40:10 2021 +0900

    Cygwin: console: Fix a bug on input when signalled.
    
    - This patch fixes the bug that Ctrl-C sometimes does not work as
      expected in Windows Terminal.
    
    Addresses:
      https://cygwin.com/pipermail/cygwin/2021-November/249749.html

Diff:
---
 winsup/cygwin/fhandler_console.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/winsup/cygwin/fhandler_console.cc b/winsup/cygwin/fhandler_console.cc
index aee5e8284..2e754a132 100644
--- a/winsup/cygwin/fhandler_console.cc
+++ b/winsup/cygwin/fhandler_console.cc
@@ -1178,6 +1178,10 @@ out:
   /* Discard processed recored. */
   DWORD dummy;
   DWORD discard_len = min (total_read, i + 1);
+  /* If input is signalled, do not discard input here because
+     tcflush() is already called from line_edit(). */
+  if (stat == input_signalled && !(ti->c_lflag & NOFLSH))
+    discard_len = 0;
   if (discard_len)
     ReadConsoleInputW (get_handle (), input_rec, discard_len, &dummy);
   return stat;