linux-kernel - Re: [PATCH v2 5/7] clone4: Add a CLONE_AUTOREAP flag to automatically reap the child process

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Message-ID: <1766646.jusoNDOCPE@tjmaciei-mobl4>
Date:	Fri, 20 Mar 2015 11:46:33 -0700
From:	Thiago Macieira <thiago.macieira@...el.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Josh Triplett <josh@...htriplett.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Kees Cook <keescook@...omium.org>,
	"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 v2 5/7] clone4: Add a CLONE_AUTOREAP flag to automatically reap the child process

On Friday 20 March 2015 19:14:04 Oleg Nesterov wrote:
> Also. I forgot that the kernel always resets ->exit_signal to SIGCHLD on
> exec or reparenting. Reparenting is probably fine. But what about exec?
> Should it keep ->exit_signal == 0 if "autoreap" ? I think it should not, to
> avoid the strange special case.

Not delivering any signal was the objective of this patch series, so yes 
exit_signal == 0 should survive an exec and even re-exec.

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

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