linux-kernel - Re: [PATCH v2 0/5] pid: add pidfd

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Date:   Sat, 30 Mar 2019 17:19:32 +0100
From:   Christian Brauner <christian@...uner.io>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
CC:     Jann Horn <jannh@...gle.com>, Andrew Lutomirski <luto@...nel.org>,
        David Howells <dhowells@...hat.com>, serge@...lyn.com,
        Linux API <linux-api@...r.kernel.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Kees Cook <keescook@...omium.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Michael Kerrisk-manpages <mtk.manpages@...il.com>,
        bl0pbl33p@...il.com, "Dmitry V. Levin" <ldv@...linux.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Oleg Nesterov <oleg@...hat.com>,
        nagarathnam.muthusamy@...cle.com, Aleksa Sarai <cyphar@...har.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Joel Fernandes <joel@...lfernandes.org>, dancol@...gle.com
Subject: Re: [PATCH v2 0/5] pid: add pidfd_open()

On March 30, 2019 5:09:10 PM GMT+01:00, Linus Torvalds <torvalds@...ux-foundation.org> wrote:
>On Fri, Mar 29, 2019 at 8:54 AM Christian Brauner
><christian@...uner.io> wrote:
>>
>> /* Introduction */
>> This adds the pidfd_open() syscall.
>> pidfd_open() allows to retrieve file descriptors for a given pid.
>This
>> includes both file descriptors for processes and file descriptors for
>> threads.
>
>I'm ok with the pidfd_open() call to just get a pidfd, but that

From pure API perspective that's all I care about: independence of procfs.
Once we have pidfd_open() we can cleanly signal threads etc.

>"pidfd_to_profs()" needs to go away.
>
>If you want to open the /proc/<pid>/status file, then just do that.
>This whole "do one and convert to the other" needs to die. No, no, no.
>
>                   Linus