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SubjectRe: signalfd() not handling sigqueue() sigval data correctly
On Thu, Apr 10, 2008 at 7:03 AM, Michael Kerrisk
<mtk.manpages@googlemail.com> wrote:
> Hi Davide,
>
> > > I was doing some playing about with signalfd(), and seem to have encountered a
> > > bug: when a signalfd read() fetches data for a signal that was sent by
> > > sigqueue(), the data accompanying the signal is not returned. Instead
> > > ssi_int/ssi_ptr is zero.
> >
> > Michael, can you give the patch below a spin? I tested it on my x86_64 box
> > and seems to be working fine:
> >
> > Got signal 44
> > ssi_code= -1
> > ssi_pid = 6314
> > ssi_uid = 1000
> > ssi_int = 123
> > ssi_ptr = 7b
>
> This works for me on x86-32. Thanks Davide!

Davide,

Are you going to get this pushed into 2.6.26? I assume we can't get
it into 2.6.25...

Cheers,

Michael

> > ---
> > 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/
> Want to report a man-pages bug? Look here:
> http://www.kernel.org/doc/man-pages/reporting_bugs.html
>



--
Michael Kerrisk
Maintainer of the Linux man-pages project
http://www.kernel.org/doc/man-pages/
Want to report a man-pages bug? Look here:
http://www.kernel.org/doc/man-pages/reporting_bugs.html


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