[newlib-cygwin] Cygwin: pty: Fix Ctrl-C behaviour in latest GDB.

[Takashi Yano <tyan0@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=0a67adb0f518b1590bd94cdf98bed60888156bed

commit 0a67adb0f518b1590bd94cdf98bed60888156bed
Author: Takashi Yano <takashi.yano@nifty.ne.jp>
Date:   Mon Apr 18 20:07:48 2022 +0900

    Cygwin: pty: Fix Ctrl-C behaviour in latest GDB.
    
    - In the latest GDB (11.2-1), Ctrl-C behaviour is broken a bit for
      non-cygwin inferior. For example, Ctrl-C on GDB prompt is not sent
      to GDB but to the inferior. This patch fixes the issue.

Diff:
---
 winsup/cygwin/fhandler_termios.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/winsup/cygwin/fhandler_termios.cc b/winsup/cygwin/fhandler_termios.cc
index 5cd44d7bf..4eff5eab3 100644
--- a/winsup/cygwin/fhandler_termios.cc
+++ b/winsup/cygwin/fhandler_termios.cc
@@ -350,7 +350,8 @@ fhandler_termios::process_sigs (char c, tty* ttyp, fhandler_termios *fh)
 			 cygwin apps started from non-cygwin shell. */
       if (c == '\003' && p && p->ctty == ttyp->ntty && p->pgid == pgid
 	  && ((p->process_state & PID_NOTCYGWIN)
-	      || (p->exec_dwProcessId == p->dwProcessId)
+	      || ((p->exec_dwProcessId == p->dwProcessId)
+		  && ttyp->pty_input_state_eq (tty::to_nat))
 	      || !(p->process_state & PID_CYGPARENT)))
 	{
 	  /* Ctrl-C event will be sent only to the processes attaching
@@ -406,6 +407,7 @@ fhandler_termios::process_sigs (char c, tty* ttyp, fhandler_termios *fh)
 	    with_debugger = true; /* inferior is cygwin app */
 	  if (!(p->process_state & PID_NOTCYGWIN)
 	      && (p->exec_dwProcessId == p->dwProcessId) /* Check marker */
+	      && ttyp->pty_input_state_eq (tty::to_nat)
 	      && p->pid == pgid)
 	    with_debugger_nat = true; /* inferior is non-cygwin app */
 	}