linux-kernel - Re: [PATCH 2/5] pidfd: add pidfd

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Message-ID: <20190725101626.GD4707@redhat.com>
Date:   Thu, 25 Jul 2019 12:16:27 +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, linux-api@...r.kernel.org
Subject: Re: [PATCH 2/5] pidfd: add pidfd_wait()

On 07/24, Christian Brauner wrote:
>
> +SYSCALL_DEFINE6(pidfd_wait, int, pidfd, int __user *, stat_addr,
> +		siginfo_t __user *, info, struct rusage __user *, ru,
> +		unsigned int, states, unsigned int, flags)
> +{

Oh, I too think that P_PIDFD makes more sense.

and could you explain in the changelog why? I am not arguing and if
nothing else this is consistent with other pidfd features, but if you
are parent/debugger you can't hit the problem with pid-reuse, unless
you races with your sub-threads.

Oleg.