linux-kernel - Re: [PATCH 4/5] pidfd: add CLONE_WAIT

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Message-ID: <20190725161316.GI4707@redhat.com>
Date:   Thu, 25 Jul 2019 18:13:17 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Christian Brauner <christian@...uner.io>
Cc:     linux-kernel@...r.kernel.org, arnd@...db.de, ebiederm@...ssion.com,
        keescook@...omium.org, joel@...lfernandes.org, tglx@...utronix.de,
        tj@...nel.org, dhowells@...hat.com, jannh@...gle.com,
        luto@...nel.org, akpm@...ux-foundation.org, cyphar@...har.com,
        torvalds@...ux-foundation.org, viro@...iv.linux.org.uk,
        kernel-team@...roid.com, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-api@...r.kernel.org
Subject: Re: [PATCH 4/5] pidfd: add CLONE_WAIT_PID

On 07/25, Christian Brauner wrote:
>
> The key is that you want to be able to create child processes in a
> shared library without the main programing having to know about this so
> that it can use P_ALL and never get stuff from the library.

OK, thanks...

in this case you should probablu pass 0 in CSIGNAL to ensure that the main
program won't be notified when that child exits.

Oleg.