public inbox for cygwin-cvs@sourceware.org help / color / mirror / Atom feed
From: Takashi Yano <tyan0@sourceware.org> To: cygwin-cvs@sourceware.org Subject: [newlib-cygwin/cygwin-3_4-branch] Cygwin: console: Fix hangup of less on quit after the window is resized. Date: Thu, 22 Dec 2022 11:51:13 +0000 (GMT) [thread overview] Message-ID: <20221222115113.059BF3858D1E@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=76e1edeb27a573a955ebf3ae5a7a7fd1a75b290f commit 76e1edeb27a573a955ebf3ae5a7a7fd1a75b290f Author: Takashi Yano <takashi.yano@nifty.ne.jp> Date: Thu Dec 22 20:25:22 2022 +0900 Cygwin: console: Fix hangup of less on quit after the window is resized. https://cygwin.com/pipermail/cygwin/2022-December/252737.html If the less is started from non-cygwin shell and window size is changed, it will hang-up when quitting. The cause of the proglem is that less uses longjump() in signal handler. If the signal handler is called while cygwin is acquiring the mutex, cygwin loses the chance to release mutex. With this patch, the mutex is released just before calling kill_pgrp() and re-acquired when kill_pgrp() returns. Reported-by: Gregory Mason <grmason@epic.com> Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp> Diff: --- winsup/cygwin/fhandler/console.cc | 4 ++++ winsup/cygwin/release/3.4.4 | 4 ++++ 2 files changed, 8 insertions(+) diff --git a/winsup/cygwin/fhandler/console.cc b/winsup/cygwin/fhandler/console.cc index a4a367005..bfcdb84b3 100644 --- a/winsup/cygwin/fhandler/console.cc +++ b/winsup/cygwin/fhandler/console.cc @@ -939,7 +939,11 @@ fhandler_console::send_winch_maybe () if (wincap.has_con_24bit_colors () && !con_is_legacy && wincap.has_con_broken_tabs ()) fix_tab_position (get_output_handle ()); + /* longjmp() may be called in the signal handler like less, + so release input_mutex temporarily before kill_pgrp(). */ + release_input_mutex (); get_ttyp ()->kill_pgrp (SIGWINCH); + acquire_input_mutex (mutex_timeout); return true; } return false; diff --git a/winsup/cygwin/release/3.4.4 b/winsup/cygwin/release/3.4.4 index 6ac702375..3331b3166 100644 --- a/winsup/cygwin/release/3.4.4 +++ b/winsup/cygwin/release/3.4.4 @@ -3,3 +3,7 @@ Bug Fixes - Fix an uninitialized variable having weird side-effects in path handling. Addresses: https://cygwin.com/pipermail/cygwin/2022-December/252734.html + +- Fix hang-up of less on quit which occurs when it is started from non-cygwin + shell and window is resized. + Addresses: https://cygwin.com/pipermail/cygwin/2022-December/252737.html
reply other threads:[~2022-12-22 11:51 UTC|newest] Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20221222115113.059BF3858D1E@sourceware.org \ --to=tyan0@sourceware.org \ --cc=cygwin-cvs@sourceware.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).