From: Andy Lutomirski <luto@amacapital.net>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Tycho Andersen <tycho@tycho.pizza>,
Christian Brauner <brauner@kernel.org>,
linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
Tycho Andersen <tandersen@netflix.com>,
"Eric W. Biederman" <ebiederm@xmission.com>
Subject: Re: [RFC PATCH] pidfd: implement PIDFD_THREAD flag for pidfd_open()
Date: Wed, 31 Jan 2024 10:11:55 -0800 [thread overview]
Message-ID: <CALCETrUFDkt+K9zG8mczxzAFy9t-6Mx5Cz-Sx+it6a4nt+O0pg@mail.gmail.com> (raw)
In-Reply-To: <20240129112313.GA11635@redhat.com>
On Mon, Jan 29, 2024 at 3:24 AM Oleg Nesterov <oleg@redhat.com> wrote:
>
> On 01/27, Oleg Nesterov wrote:
> >
> > I'll (hopefully) send v2 on top of
> >
> > pidfd: cleanup the usage of __pidfd_prepare's flags
> > pidfd: don't do_notify_pidfd() if !thread_group_empty()
> >
> > on Monday
>
> Sorry, I don't have time to finish v2 today, I need to update the comments
> and write the changelog.
>
> But the patch itself is ready, I am sending it for review.
>
> Tycho, Christian, any comments?
Right now, pidfd_send_signal() sends signals to processes, like so:
* The syscall currently only signals via PIDTYPE_PID which covers
* kill(<positive-pid>, <signal>. It does not signal threads or process
* groups.
This patch adds PIDFD_THREAD which, potentially confusingly, doesn't
change this (AFAICS). So at least that should be documented loudly
and clearly, IMO. But I actually just bumped in to this limitation in
pidfd_send_signal(), like so:
https://github.com/systemd/systemd/issues/31093
Specifically, systemd can't properly emulate Ctrl-C using pidfd_send_signal().
I don't know whether implementing the other signal types belongs as
part of this patch, but they're at least thematically related.
--Andy
next prev parent reply other threads:[~2024-01-31 18:12 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-23 15:34 [PATCH v3 0/3] pidfds for non thread group leaders Tycho Andersen
2024-01-23 15:34 ` [PATCH v3 1/3] pidfd: allow pidfd_open() on non-thread-group leaders Tycho Andersen
2024-01-23 19:56 ` Oleg Nesterov
2024-01-23 21:10 ` Tycho Andersen
2024-01-23 22:22 ` Oleg Nesterov
2024-01-24 1:25 ` Oleg Nesterov
2024-01-25 14:08 ` Oleg Nesterov
2024-01-25 17:17 ` Christian Brauner
2024-01-25 17:51 ` Oleg Nesterov
2024-01-25 18:03 ` Tycho Andersen
2024-01-25 18:25 ` Oleg Nesterov
2024-01-25 18:30 ` Oleg Nesterov
2024-01-25 18:36 ` Tycho Andersen
2024-01-26 9:49 ` Christian Brauner
2024-01-26 9:42 ` Christian Brauner
2024-01-26 14:33 ` Oleg Nesterov
2024-01-26 9:47 ` Christian Brauner
2024-01-26 14:33 ` Oleg Nesterov
2024-01-27 14:26 ` Christian Brauner
2024-01-26 21:50 ` Tycho Andersen
2024-01-27 10:54 ` Oleg Nesterov
2024-01-27 14:33 ` Christian Brauner
2024-01-27 15:55 ` Tycho Andersen
2024-01-27 16:31 ` Oleg Nesterov
2024-01-27 17:20 ` Tycho Andersen
2024-01-27 19:31 ` Oleg Nesterov
2024-01-27 20:44 ` Tycho Andersen
2024-01-27 21:10 ` Oleg Nesterov
2024-01-29 11:23 ` [RFC PATCH] pidfd: implement PIDFD_THREAD flag for pidfd_open() Oleg Nesterov
2024-01-29 13:41 ` Christian Brauner
2024-01-29 14:31 ` Tycho Andersen
2024-01-29 15:14 ` Christian Brauner
2024-01-30 11:21 ` Oleg Nesterov
2024-01-31 18:11 ` Andy Lutomirski [this message]
2024-01-31 18:48 ` Oleg Nesterov
2024-01-31 19:14 ` Oleg Nesterov
2024-01-31 19:24 ` Andy Lutomirski
2024-01-31 19:46 ` Christian Brauner
2024-01-31 19:50 ` Andy Lutomirski
2024-02-01 13:30 ` Christian Brauner
2024-02-01 13:39 ` Christian Brauner
2024-02-01 19:33 ` Andy Lutomirski
2024-01-23 15:34 ` [PATCH v3 2/3] selftests/pidfd: add non-thread-group leader tests Tycho Andersen
2024-01-23 15:34 ` [PATCH v3 3/3] clone: allow CLONE_THREAD | CLONE_PIDFD together Tycho Andersen
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