From: David Drysdale <drysdale@google.com>
To: Josh Triplett <josh@joshtriplett.org>
Cc: Thiago Macieira <thiago.macieira@intel.com>,
Kees Cook <keescook@chromium.org>,
Al Viro <viro@zeniv.linux.org.uk>,
Andrew Morton <akpm@linux-foundation.org>,
Andy Lutomirski <luto@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Oleg Nesterov <oleg@redhat.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
"H. Peter Anvin" <hpa@zytor.com>, Rik van Riel <riel@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Michael Kerrisk <mtk.manpages@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
Linux API <linux-api@vger.kernel.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"x86@kernel.org" <x86@kernel.org>
Subject: Re: [PATCH v2 0/7] CLONE_FD: Task exit notification via file descriptor
Date: Mon, 23 Mar 2015 14:12:34 +0000 [thread overview]
Message-ID: <CAHse=S-e4Rorgzt=LohtNUeVAXTLbpr8ftPGnBZXgO5sQs28RA@mail.gmail.com> (raw)
In-Reply-To: <20150316232949.GB31751@cloud>
On Mon, Mar 16, 2015 at 11:29 PM, <josh@joshtriplett.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?
next prev parent reply other threads:[~2015-03-23 14:13 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-15 7:59 [PATCH v2 0/7] CLONE_FD: Task exit notification via file descriptor Josh Triplett
2015-03-15 7:59 ` [PATCH v2 1/7] clone: Support passing tls argument via C rather than pt_regs magic Josh Triplett
2015-03-15 7:59 ` [PATCH v2 2/7] x86: Opt into HAVE_COPY_THREAD_TLS, for both 32-bit and 64-bit Josh Triplett
2015-03-15 7:59 ` [PATCH v2 3/7] Introduce a new clone4 syscall with more flag bits and extensible arguments Josh Triplett
2015-03-23 14:11 ` David Drysdale
2015-03-23 15:05 ` josh
2015-03-31 14:41 ` David Drysdale
2015-03-15 7:59 ` [PATCH v2 4/7] kernel/fork.c: Pass arguments to _do_fork and copy_process using clone4_args Josh Triplett
2015-03-15 8:00 ` [PATCH v2 5/7] clone4: Add a CLONE_AUTOREAP flag to automatically reap the child process Josh Triplett
2015-03-15 14:52 ` Oleg Nesterov
2015-03-15 17:18 ` Josh Triplett
2015-03-15 19:55 ` Oleg Nesterov
2015-03-15 23:34 ` Josh Triplett
2015-03-20 18:14 ` Oleg Nesterov
2015-03-20 18:46 ` Thiago Macieira
2015-03-20 19:09 ` Oleg Nesterov
2015-03-20 21:10 ` josh
2015-03-15 8:00 ` [PATCH v2 6/7] signal: Factor out a helper function to process task_struct exit_code Josh Triplett
2015-03-15 8:00 ` [PATCH v2 7/7] clone4: Add a CLONE_FD flag to get task exit notification via fd Josh Triplett
2015-03-23 17:38 ` David Drysdale
2015-03-25 14:53 ` Josh Triplett
2015-04-06 8:30 ` Sergey Senozhatsky
2015-04-06 9:31 ` Josh Triplett
2015-03-15 8:00 ` [PATCH v2 man-pages] clone4.2: New manpage documenting clone4(2) Josh Triplett
2015-03-15 8:04 ` [PATCH v2 0/7] CLONE_FD: Task exit notification via file descriptor Josh Triplett
2015-03-16 21:44 ` Kees Cook
2015-03-16 22:14 ` Thiago Macieira
2015-03-16 22:36 ` Kees Cook
2015-03-16 22:50 ` Thiago Macieira
2015-03-16 23:26 ` Kees Cook
2015-03-16 23:35 ` josh
2015-03-16 23:29 ` josh
2015-03-17 0:49 ` Thiago Macieira
2015-03-23 14:12 ` David Drysdale [this message]
2015-03-23 15:03 ` josh
2015-03-16 23:25 ` josh
2015-03-31 20:08 ` Jonathan Corbet
2015-03-31 22:02 ` josh
2015-04-01 7:24 ` Jonathan Corbet
2015-04-09 2:19 ` Josh Triplett
2015-05-29 7:43 ` Florian Weimer
2015-05-29 20:27 ` Thiago Macieira
2015-06-15 10:06 ` Florian Weimer
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