On Wed, 2006-01-11 at 14:55 +0100, Bernd Petrovitsch wrote:
> On Wed, 2006-01-11 at 13:49 +0000, Ian Campbell wrote:
> > On Wed, 2006-01-11 at 14:25 +0100, Bernd Petrovitsch wrote:
> > > Then this leaves the race if an old pid is reused in a newly created
> > > process before the last instances of that pid is cleaned up.
> >
> > The PID won't be available to be re-used until the signal handler has
> > called waitpid() on it?
>
> Yes.
> But ATM the signal handler calls waitpid() and stores the pid in a
> to-be-cleaned-pids array (at time X).
> The main loop at some time in the future (say at time X+N) walks through
> the to-be-cleaned-pids array and cleans them from the active-childs
> array.
yuk... I'd say the application is a bit dumb for calling waitpid before
it is actually prepared for the pid to be reclaimed.
A possible solution would be to also defer the waitpid until the main
loop cleanup function, perhaps flagging the entry in the child array as
not-active between the signal and that time or moving the pid from the
active to an inactive array in the signal handler.
Ian.
--
Ian Campbell
Current Noise: Sloth - Into The Sun
To err is human,
To purr feline.
-- Robert Byrne
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
