[newlib-cygwin] Cygwin: pty: Lessen the side effect of workaround for rlwarp.

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=62e739b51bb1cbe644470c40ca414d8a2ea34c18

commit 62e739b51bb1cbe644470c40ca414d8a2ea34c18
Author: Takashi Yano via Cygwin-patches <cygwin-patches@cygwin.com>
Date:   Tue Jan 19 18:27:02 2021 +0900

    Cygwin: pty: Lessen the side effect of workaround for rlwarp.
    
    - This patch lessens the side effect of the workaround for rlwrap
      introduced by commit 4e16b033.

Diff:
---
 winsup/cygwin/fhandler_tty.cc | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/winsup/cygwin/fhandler_tty.cc b/winsup/cygwin/fhandler_tty.cc
index 473c0c968..c78e996e8 100644
--- a/winsup/cygwin/fhandler_tty.cc
+++ b/winsup/cygwin/fhandler_tty.cc
@@ -1176,11 +1176,19 @@ fhandler_pty_slave::tcgetattr (struct termios *t)
 {
   reset_switch_to_pcon ();
   *t = get_ttyp ()->ti;
+
   /* Workaround for rlwrap */
-  if (get_ttyp ()->pcon_start)
-    t->c_lflag &= ~(ICANON | ECHO);
-  if (get_ttyp ()->h_pseudo_console)
-    t->c_iflag &= ~ICRNL;
+  cygheap_fdenum cfd (false);
+  while (cfd.next () >= 0)
+    if (cfd->get_major () == DEV_PTYM_MAJOR
+	&& cfd->get_minor () == get_minor ())
+      {
+	if (get_ttyp ()->pcon_start)
+	  t->c_lflag &= ~(ICANON | ECHO);
+	if (get_ttyp ()->h_pseudo_console)
+	  t->c_iflag &= ~ICRNL;
+	break;
+      }
   return 0;
 }