From: Phillip Wood <phillip.wood123@gmail.com>
To: Johannes Schindelin <Johannes.Schindelin@gmx.de>,
Phillip Wood <phillip.wood@dunelm.org.uk>
Cc: Git Mailing List <git@vger.kernel.org>, carenas@gmail.com
Subject: Re: [PATCH 4/4] terminal: restore settings on SIGTSTP
Date: Thu, 10 Mar 2022 16:06:29 +0000 [thread overview]
Message-ID: <7fff6841-968d-b741-2589-fa737499113d@gmail.com> (raw)
In-Reply-To: <nycvar.QRO.7.76.6.2203091310080.357@tvgsbejvaqbjf.bet>
Hi Dscho
On 09/03/2022 12:19, Johannes Schindelin wrote:
> Hi Phillip,
>
> On Fri, 4 Mar 2022, Phillip Wood wrote:
>
>> From: Phillip Wood <phillip.wood@dunelm.org.uk>
>>
>> If the user suspends git while it is waiting for a keypress reset the
>> terminal before stopping and restore the settings when git resumes. If
>> the user tries to resume in the background print an error
>> message (taking care to use async safe functions) before stopping
>> again. Ideally we would reprint the prompt for the user when git
>> resumes but this patch just restarts the read().
>>
>> The signal handler is established with sigaction() rather than using
>> sigchain_push() as this allows us to control the signal mask when the
>> handler is invoked and ensure SA_RESTART is used to restart the
>> read() when resuming.
>
> This description makes sense. From my understanding of signals, the code
> also does make sense, but it is unfortunate that it has to be so much code
> to implement something as straight-forward as suspend/resume.
Yes it is a lot of code. It would be a bit simpler if we omitted the
warning about resuming in the background but I think that is worth
having. There's also a lot of changing signal masks to avoid stopping
twice if the user presses ^Z a second time while the signal handler is
active.
> FWIW I tested the `add -p` command with these patches on Windows and it
> still works as well as when I had developed it.
Thanks for testing this on Windows, I don't think we have any meaningful
test coverage for interactive.singlekey and it is probably tricky to add
because it relies on having a tty.
Best Wishes
Phillip
> Thank you,
> Dscho
next prev parent reply other threads:[~2022-03-10 16:06 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-04 13:11 [PATCH 0/4] builtin add -p: hopefully final readkey fixes Phillip Wood
2022-03-04 13:11 ` [PATCH 1/4] terminal: use flags for save_term() Phillip Wood
2022-03-04 20:40 ` Ramsay Jones
2022-03-07 11:11 ` Phillip Wood
2022-03-07 20:21 ` Ramsay Jones
2022-03-08 10:41 ` Phillip Wood
2022-03-05 14:02 ` Ævar Arnfjörð Bjarmason
2022-03-07 10:45 ` Phillip Wood
2022-03-07 12:06 ` Ævar Arnfjörð Bjarmason
2022-03-04 13:11 ` [PATCH 2/4] terminal: don't assume stdin is /dev/tty Phillip Wood
2022-03-04 20:42 ` Ramsay Jones
2022-03-04 13:11 ` [PATCH 3/4] terminal: work around macos poll() bug Phillip Wood
2022-03-04 13:11 ` [PATCH 4/4] terminal: restore settings on SIGTSTP Phillip Wood
2022-03-05 13:59 ` Ævar Arnfjörð Bjarmason
2022-03-07 10:53 ` Phillip Wood
2022-03-07 11:49 ` Ævar Arnfjörð Bjarmason
2022-03-07 13:49 ` Phillip Wood
2022-03-07 14:45 ` Ævar Arnfjörð Bjarmason
2022-03-08 10:54 ` Phillip Wood
2022-03-09 12:19 ` Johannes Schindelin
2022-03-10 16:06 ` Phillip Wood [this message]
2022-03-09 11:03 ` [PATCH v2 0/4] builtin add -p: hopefully final readkey fixes Phillip Wood
2022-03-09 11:03 ` [PATCH v2 1/4] terminal: use flags for save_term() Phillip Wood
2022-03-11 16:52 ` Carlo Arenas
2022-03-14 10:49 ` Phillip Wood
2022-03-09 11:03 ` [PATCH v2 2/4] terminal: don't assume stdin is /dev/tty Phillip Wood
2022-03-09 11:03 ` [PATCH v2 3/4] terminal: work around macos poll() bug Phillip Wood
2022-03-10 13:35 ` Ævar Arnfjörð Bjarmason
2022-03-10 16:02 ` Phillip Wood
2022-03-10 18:02 ` Junio C Hamano
2022-03-09 11:03 ` [PATCH v2 4/4] terminal: restore settings on SIGTSTP Phillip Wood
2022-03-09 23:10 ` [PATCH v2 0/4] builtin add -p: hopefully final readkey fixes Junio C Hamano
2022-03-09 23:37 ` Junio C Hamano
2022-03-10 13:28 ` Phillip Wood
2022-03-10 18:18 ` Phillip Wood
2022-03-10 18:53 ` Junio C Hamano
2022-03-10 13:25 ` Johannes Schindelin
2022-03-10 16:08 ` Phillip Wood
2022-03-15 10:57 ` [PATCH v3 " Phillip Wood
2022-03-15 10:57 ` [PATCH v3 1/4] terminal: use flags for save_term() Phillip Wood
2022-03-15 10:57 ` [PATCH v3 2/4] terminal: don't assume stdin is /dev/tty Phillip Wood
2022-03-15 17:42 ` Junio C Hamano
2022-03-15 18:01 ` rsbecker
2022-03-15 19:05 ` Junio C Hamano
2022-03-15 19:38 ` rsbecker
2022-03-15 10:57 ` [PATCH v3 3/4] terminal: work around macos poll() bug Phillip Wood
2022-03-15 10:57 ` [PATCH v3 4/4] terminal: restore settings on SIGTSTP Phillip Wood
2022-03-15 17:51 ` Junio C Hamano
2022-03-16 18:54 ` [PATCH v4 0/4] builtin add -p: hopefully final readkey fixes Phillip Wood
2022-03-16 18:54 ` [PATCH v4 1/4] terminal: use flags for save_term() Phillip Wood
2022-03-16 18:54 ` [PATCH v4 2/4] terminal: don't assume stdin is /dev/tty Phillip Wood
2022-03-16 18:54 ` [PATCH v4 3/4] terminal: work around macos poll() bug Phillip Wood
2022-03-16 18:54 ` [PATCH v4 4/4] terminal: restore settings on SIGTSTP Phillip Wood
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