linux-kernel - Re: [PATCH 1/2] ptrace: add ability to retrieve signals without removing from a queue (v3)

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Date:	Wed, 27 Feb 2013 19:38:50 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrey Vagin <avagin@...nvz.org>
Cc:	linux-kernel@...r.kernel.org, criu@...nvz.org,
	linux-api@...r.kernel.org, Roland McGrath <roland@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Dave Jones <davej@...hat.com>,
	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pedro Alves <palves@...hat.com>
Subject: Re: [PATCH 1/2] ptrace: add ability to retrieve signals without
	removing from a queue (v3)

On 02/27, Andrey Vagin wrote:
>
> +struct ptrace_peeksiginfo_args {
> +	__u64 off;	/* from which siginfo to start */

Cough... You are optimist. You want to handle the case when the
tracee has 1 << 33 or more pending sigqueues. OK good luck ;)

Looks correct, just one nit.

> +	for (i = 0; i < arg.nr; i++) {
> ...
> +		data += sizeof(siginfo_t);
> +
> +		if (signal_pending(current)) {
> +			i++; /* accounting the current siginfo */
> +			break;
> +		}

Imho, this is confusing. Just do

	for (i = 0; i < arg.nr; ) {
		...

		data += sizeof(siginfo_t);
		i++;

		if (signal_pending(current))
			break;

Oleg.

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