On 07/30, Andrew Morton wrote:
>
> On Sun, 29 Jul 2007 19:05:05 +0200
> Manfred Spraul <[email protected]> wrote:
>
> > Hi Andrew,
> >
> > poll() returns -EINTR if a signal is pending.
> > EINTR is a bad choice: it means that poll returns to user space if the
> > task is stopped by SIGSTOP/SIGCONT or by the freezer.
> > select() and ppoll() both use ERESTARTNOHAND, this avoids a return to
> > user space for signals that are handled by the kernel.
> >
> > The patch switches poll() to ERESTARTNOHAND.
> > Tested with FC6. Patch against 2.6.23-rc1-mm1.
>
> hm. Is this a fix against
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.23-rc1/2.6.23-rc1-mm1/broken-out/do_poll-return-eintr-when-signalled.patch
> only, or does mainline also need fixing?
That patch doesn't (at least shouldn't) change the behaviour.
> I guess the consequences of the thing-which-this-fixes aren't huge, s I ca
> queue this up for 2.6.24, after Oleg's
> do_poll-return-eintr-when-signalled.patch?
>
> > Signed-off-by: Manfred Spraul <[email protected]>
> >
> > --- 2.6/fs/select.c 2007-07-28 20:31:51.000000000 +0200
> > +++ build-2.6/fs/select.c 2007-07-28 21:21:52.000000000 +0200
> > @@ -621,7 +621,7 @@ static int do_poll(unsigned int nfds, s
> > if (!count) {
> > count = wait->error;
> > if (signal_pending(current))
> > - count = -EINTR;
> > + count = -ERESTARTNOHAND;
I am not sure. This means we restart sys_poll() with the same timeout
if there is no pending signal. I think we need ERESTART_RESTARTBLOCK
logic.
Oleg.
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