linux-kernel - Re: [PATCH v3 1/1] waitid: Add support for waiting for the current process group

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Message-ID: <20190814160917.GG11595@redhat.com>
Date:   Wed, 14 Aug 2019 18:09:17 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     linux-kernel@...r.kernel.org, libc-alpha@...rceware.org,
        alistair23@...il.com, ebiederm@...ssion.com, arnd@...db.de,
        dalias@...c.org, torvalds@...ux-foundation.org,
        adhemerval.zanella@...aro.org, fweimer@...hat.com,
        palmer@...ive.com, macro@....com, zongbox@...il.com,
        akpm@...ux-foundation.org, viro@...iv.linux.org.uk, hpa@...or.com
Subject: Re: [PATCH v3 1/1] waitid: Add support for waiting for the current
 process group

On 08/14, Christian Brauner wrote:
>
> and a signal could come in between the system call that
> retrieved the process gorup and the call to waitid that changes the
                        ^^^^^
> current process group.

I noticed this typo only because I spent 2 minutes or more trying to
understand this sentence ;) But yes, a signal handler or another thread
can change pgrp in between.

Reviewed-by: Oleg Nesterov <oleg@...hat.com>