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

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Message-ID: <CAHk-=whZPKzbPQftNGFB=iaSZGTSXNkhUASWF2V53MwB+A4zAQ@mail.gmail.com>
Date:   Wed, 24 Jul 2019 10:45:38 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Christian Brauner <christian@...uner.io>
Cc:     Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Oleg Nesterov <oleg@...hat.com>, Arnd Bergmann <arnd@...db.de>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tejun Heo <tj@...nel.org>, David Howells <dhowells@...hat.com>,
        Jann Horn <jannh@...gle.com>,
        Andrew Lutomirski <luto@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Aleksa Sarai <cyphar@...har.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Android Kernel Team <kernel-team@...roid.com>,
        Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH 2/5] pidfd: add pidfd_wait()

On Wed, Jul 24, 2019 at 7:47 AM Christian Brauner <christian@...uner.io> wrote:
>
> This adds the pidfd_wait() syscall.

I despise this patch.

Why can't this just be a new P_PIDFD flag, and then use
"waitid(P_PIDFD, pidfd, ...);"

Yes, yes, yes, I realize that "pidfd" is of type "int", and waitid()
takes an argument of type pid_t, but it's the same type in the end,
and it does seem like the whole *point* of "waitid()" is that
"idtype_t idtype" which tells you what kind of ID you're passing it.

               Linus