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

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Message-ID: <878swsr7nn.fsf@oldenburg2.str.redhat.com>
Date:   Tue, 02 Apr 2019 13:03:24 +0200
From:   Florian Weimer <fweimer@...hat.com>
To:     Daniel Colascione <dancol@...gle.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Jonathan Kowalski <bl0pbl33p@...il.com>,
        Aleksa Sarai <cyphar@...har.com>,
        Andy Lutomirski <luto@...capital.net>,
        Christian Brauner <christian@...uner.io>,
        Jann Horn <jannh@...gle.com>,
        Andrew Lutomirski <luto@...nel.org>,
        David Howells <dhowells@...hat.com>,
        "Serge E. Hallyn" <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>,
        "Dmitry V. Levin" <ldv@...linux.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Nagarathnam Muthusamy <nagarathnam.muthusamy@...cle.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Joel Fernandes <joel@...lfernandes.org>
Subject: Re: [PATCH v2 0/5] pid: add pidfd_open()

* Daniel Colascione:

> But doesn't the CSIGNAL approach still require that libraries somehow
> coordinate which non-SIGCHLD signal they use? (Signal coordination a
> separate problem, unfortunately.)

There's already an allocation mechanism for realtime signals in glibc,
via __libc_allocate_rtsig.  I don't know what it is about: It's clearly
intended as an external interface, yet there isn't a declaration in any
installed header file.  ALSA has some optional code to use it, but I
don't think distributions compile ALSA in that way; it always uses SIGIO.

Thanks,
Florian