Johan Cockx wrote:
>
>
> On Mon, Oct 11, 2010 at 4:07 PM, Gilles Chanteperdrix
> <gilles.chanteperd...@xenomai.org
> <mailto:gilles.chanteperd...@xenomai.org>> wrote:
>
> Johan Cockx wrote:
> > A printf in src/skins/posix/select.c confirms that __wrap_select
> is called.
>
> Ok, but there are many branches here, could you check whether it emits
> the syscall, and if yes, what is the result of this syscall?
>
>
> First, it executes:
> err = XENOMAI_SKINCALL5(__pse51_muxid, __pse51_select, __nfds,
> __readfds, __writefds, __exceptfds, __timeout);
> (which expands to assembly code; is this the syscall you are referring to?)
>
> This returns err == -9 ( == -EBADF), so it continues to call
> __real_select (which as far as I understand it calls the plain
> non-xenomai select) which returns 0 (timeout).
>
> EBADF suggests that there is something wrong with the file descriptor,
> but I have no clue what. The code that creates this file descriptor was
> attached to my previous mail (recv.c).
It means that one of the file descriptors you pass to select is not a
Xenomai file descriptor.
> > Attached is a small stand-alone test case. It consists of two
> programs:
> > recv.c will wait for a udp message with a timeout of 10 sec (using
> > select), and send.c will send a udp message. If recv is started
> and then
> > send (in another terminal), recv should return immediatly without
> > timeout; however, it continues to wait until a timeout occurs.
>
> By standalone, I meant without RTnet. So, please verify that you also
> get the bug without RTnet, and post a mail to the Xenomai-help mailing
> list (as opposed to the rtnet mailing list, which is the mailing list
> where you are posting currently).
>
>
> I am not sure how to test the bug with Xenomai but without RTnet. If I
> replace --posix-cflags and --posix-ldflags by --xeno-flags and
> --xeno-ldflags and use a plain (non-rt) IP address, there is no problem.
Try posix message queues.
--
Gilles.
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