linux-kernel - Re: [PATCH v2 0/7] CLONE_FD: Task exit notification via file descriptor

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Message-ID: <CAHse=S-e4Rorgzt=LohtNUeVAXTLbpr8ftPGnBZXgO5sQs28RA@mail.gmail.com>
Date:	Mon, 23 Mar 2015 14:12:34 +0000
From:	David Drysdale <drysdale@...gle.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	Thiago Macieira <thiago.macieira@...el.com>,
	Kees Cook <keescook@...omium.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"H. Peter Anvin" <hpa@...or.com>, Rik van Riel <riel@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH v2 0/7] CLONE_FD: Task exit notification via file descriptor

On Mon, Mar 16, 2015 at 11:29 PM,  <josh@...htriplett.org> wrote:
> On Mon, Mar 16, 2015 at 03:14:14PM -0700, Thiago Macieira wrote:
>> On Monday 16 March 2015 14:44:20 Kees Cook wrote:
>> > >               O_CLOEXEC
>> > >                      Set  the  close-on-exec  flag on the new file
>> > >descriptor. See the description of the O_CLOEXEC flag in open(2)  for
>> > >reasons why this may be useful.
>> >
>> > This begs the question: what happens when all CLONE_FD fds for a
>> > process are closed? Will the parent get SIGCHLD instead, will it
>> > auto-reap, or will it be un-wait-able (I assume not this...)
>>
>> Depends on CLONE_AUTOREAP. If it's on, then no one gets SIGCHLD, no one can
>> wait() on it and the process autoreaps itself.
>
> Minor nit: CLONE_AUTOREAP makes the process autoreap and nobody can wait
> on it, but if you pass SIGCHLD or some other exit signal to clone then
> you'll still get that signal.

Quick query: does CLONE_AUTOREAP also affect waiting for non-exit
events (i.e. WUNTRACED / WCONTINUED), by original parent and/or ptracer?
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