linux-kernel - Re: [PATCH 1/3] signals: sigqueue_free: don't free sigqueue if it is queued

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Date:	Wed, 21 May 2008 11:42:45 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Austin Clements <amdragon+kernelbugzilla@....edu>,
	Ingo Molnar <mingo@...e.hu>, john stultz <johnstul@...ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Michael Kerrisk <mtk.manpages@...glemail.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] signals: sigqueue_free: don't free sigqueue if it is queued

> Oh well. I just realized SIGQUEUE_CANCELLED breaks sys_sigpending() ?

Yes, it does.  Well, POSIX says after timer_delete "the disposition of
pending signals for the deleted timer is unspecified".  So perhaps one can
say that "unspecified" here can include sigpending() says it's pending but
it will disappear when delivered or accepted (means sigwait()).  But it's a
bit of a stretch.

Just properly removing the sigqueue entry and fixing the pending set is
looking pretty good.  Why was it we didn't do that?

Thanks,
Roland
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