From: Takashi Yano <takashi.yano@nifty.ne.jp>
To: cygwin-patches@cygwin.com
Subject: [PATCH] Cygwin: pty: Close pseudo console only if the process is the owner.
Date: Sat, 9 Apr 2022 13:37:36 +0900 [thread overview]
Message-ID: <20220409043736.849-1-takashi.yano@nifty.ne.jp> (raw)
- Currently, close_pseudoconsole() is called unconditionally from
fhandler_termios::process_sigs() on Ctrl-C. This causes deadlock
if Ctrl-C is pressed while setup_pseudoconsole() is called. With
this patch, close_pseudoconsole() is called only if the master
process is the owner of the nat-pipe to avoid the deadlock.
---
winsup/cygwin/fhandler_tty.cc | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/winsup/cygwin/fhandler_tty.cc b/winsup/cygwin/fhandler_tty.cc
index 4cb5f1411..c02dfb8ed 100644
--- a/winsup/cygwin/fhandler_tty.cc
+++ b/winsup/cygwin/fhandler_tty.cc
@@ -4152,7 +4152,8 @@ void
fhandler_pty_slave::release_ownership_of_nat_pipe (tty *ttyp,
fhandler_termios *fh)
{
- if (fh->get_major () == DEV_PTYM_MAJOR)
+ if (fh->get_major () == DEV_PTYM_MAJOR
+ && nat_pipe_owner_self (ttyp->nat_pipe_owner_pid))
{
fhandler_pty_master *ptym = (fhandler_pty_master *) fh;
WaitForSingleObject (ptym->pipe_sw_mutex, INFINITE);
--
2.35.1
reply other threads:[~2022-04-09 4:37 UTC|newest]
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