linux-kernel - Re: [patch] signalfd fix for incorrect SI

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Date:	Thu, 10 Apr 2008 21:17:16 +0200
From:	"Michael Kerrisk" <mtk.manpages@...glemail.com>
To:	"Davide Libenzi" <davidel@...ilserver.org>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [patch] signalfd fix for incorrect SI_QUEUE user data reporting

On Thu, Apr 10, 2008 at 8:57 PM, Davide Libenzi <davidel@...ilserver.org> wrote:
> Michael Kerrisk found out that signalfd was not reporting back user data
> pushed using sigqueue:
>
> http://groups.google.com/group/linux.kernel/msg/9397cab8551e3123
>
> The following patch makes signalfd to report back the ssi_ptr and ssi_int
> members of the signalfd_siginfo structure.
>
>
>
> Signed-off-by: Davide Libenzi <davidel@...ilserver.org>

Acked-by: Michael Kerrisk <mtk.manpages@...il.com>

>
> ---
>  fs/signalfd.c |    7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> Index: linux-2.6.mod/fs/signalfd.c
> ===================================================================
> --- linux-2.6.mod.orig/fs/signalfd.c    2008-04-09 11:53:37.000000000 -0700
> +++ linux-2.6.mod/fs/signalfd.c 2008-04-09 12:05:46.000000000 -0700
> @@ -111,9 +111,14 @@
>                err |= __put_user(kinfo->si_uid, &uinfo->ssi_uid);
>                err |= __put_user((long) kinfo->si_ptr, &uinfo->ssi_ptr);
>                break;
> -       default: /* this is just in case for now ... */
> +       default:
> +               /*
> +                * This case catches also the signals queued by sigqueue().
> +                */
>                err |= __put_user(kinfo->si_pid, &uinfo->ssi_pid);
>                err |= __put_user(kinfo->si_uid, &uinfo->ssi_uid);
> +               err |= __put_user((long) kinfo->si_ptr, &uinfo->ssi_ptr);
> +               err |= __put_user(kinfo->si_int, &uinfo->ssi_int);
>                break;
>        }
>
>



-- 
Michael Kerrisk
Maintainer of the Linux man-pages project
http://www.kernel.org/doc/man-pages/
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