linux-kernel - Re: [PATCH 0/6] CLONE_FD: Task exit notification via file descriptor

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Message-ID: <3680453.hkn7TyP8Y0@tjmaciei-mobl4>
Date:	Thu, 12 Mar 2015 19:07:20 -0700
From:	Thiago Macieira <thiago.macieira@...el.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...hat.com>,
	Kees Cook <keescook@...omium.org>,
	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>,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH 0/6] CLONE_FD: Task exit notification via file descriptor

On Thursday 12 March 2015 18:40:03 Josh Triplett wrote:
> This patch series introduces a new clone flag, CLONE_FD, which lets the
> caller handle child process exit notification via a file descriptor rather
> than SIGCHLD.  CLONE_FD makes it possible for libraries to safely launch
> and manage child processes on behalf of their caller, *without* taking over
> process-wide SIGCHLD handling (either via signal handler or signalfd).

FYI, the matching use of this feature in Qt can be found at:

	https://codereview.qt-project.org/108455
	https://codereview.qt-project.org/108456

The forkfd.c file this modifies aims at implementing the semantics of CLONE_FD 
for the fork case when support for CLONE_FD is missing in the kernel.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center

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