[newlib-cygwin/cygwin-3_4-branch] Cygwin: pty: Additional fix for transferring input at exit.

[Takashi Yano <tyan0@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=b553457f68bf8a34f3e9f3266d361e9a99530017

commit b553457f68bf8a34f3e9f3266d361e9a99530017
Author: Takashi Yano <takashi.yano@nifty.ne.jp>
Date:   Fri Jun 2 10:19:18 2023 +0900

    Cygwin: pty: Additional fix for transferring input at exit.
    
    The commit 3456e8b7db5b does not fix transferring input at exit
    appropriately. If the more than one non-cygwin apps are executed
    simultaneously and one of them is terminated, the pty master failed
    to send input to the other non-cygwin apps. This patch fixes that.
    
    Fixes: 3456e8b7db5b ("Cygwin: pty: Fix transferring type-ahead input between input pipes.")
    Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>

Diff:
---
 winsup/cygwin/fhandler/pty.cc | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/winsup/cygwin/fhandler/pty.cc b/winsup/cygwin/fhandler/pty.cc
index 9ca3b64b6..bb34d1006 100644
--- a/winsup/cygwin/fhandler/pty.cc
+++ b/winsup/cygwin/fhandler/pty.cc
@@ -4128,7 +4128,14 @@ fhandler_pty_slave::cleanup_for_non_cygwin_app (handle_set_t *p, tty *ttyp,
 						DWORD force_switch_to)
 {
   ttyp->wait_fwd ();
-  if ((ttyp->pcon_activated || stdin_is_ptys)
+  DWORD current_pid = myself->exec_dwProcessId ?: myself->dwProcessId;
+  DWORD switch_to = force_switch_to;
+  WaitForSingleObject (p->pipe_sw_mutex, INFINITE);
+  if (!switch_to)
+    switch_to = get_console_process_id (current_pid, false, true, true);
+  if (!switch_to)
+    switch_to = get_console_process_id (current_pid, false, true, false);
+  if ((!switch_to && (ttyp->pcon_activated || stdin_is_ptys))
       && ttyp->pty_input_state_eq (tty::to_nat))
     {
       WaitForSingleObject (p->input_mutex, mutex_timeout);
@@ -4138,7 +4145,6 @@ fhandler_pty_slave::cleanup_for_non_cygwin_app (handle_set_t *p, tty *ttyp,
       release_attach_mutex ();
       ReleaseMutex (p->input_mutex);
     }
-  WaitForSingleObject (p->pipe_sw_mutex, INFINITE);
   if (ttyp->pcon_activated)
     close_pseudoconsole (ttyp, force_switch_to);
   else