On Mon, Oct 11, 2010 at 4:07 PM, Gilles Chanteperdrix <
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).
> >
> > In ksrc/skins/posix/syscall.c, I added the following lines:
> > #ifndef CONFIG_XENO_OPT_POSIX_SELECT
> > #error XENO_OPT_POSIX_SELECT not enabled
> > #endif
> > It still compiles, so I am quite sure that XENO_OPT_POSIX_SELECT is
> > enabled.
>
> It confirms that the option is enabled in the kernel you compile, not in
> the one you run...
>
Correct.
>
> >
> > 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.
> >
> > I am currently running kernel version 2.6.26.8-ipipe-2.0-18, Xenomai
> > 2.4 and gcc 4.3.2.
> >
>
> It would be nice if you could check whether the latest 2.4 release (that
> is 2.4.10), if it is not the one you are using currently. Also, you do
> not tell us on which architecture you have that bug.
>
> uname -a
Linux democontrol 2.6.26.8-ipipe-2.0-18 #1 SMP Mon Oct 11 12:15:20 CEST 2010
i686 GNU/Linux
Makefile:PACKAGE_STRING = Xenomai 2.4.9.1
If there is any other information that could be of use to track down this
problem, please ask. I will try to install 2.4.10.
> --
> Gilles.
>
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