On Tue, Oct 12, 2010 at 3:38 PM, Gilles Chanteperdrix <
gilles.chanteperd...@xenomai.org> wrote:
> Gilles Chanteperdrix wrote:
> > Johan Cockx wrote:
> >>
> >> On Tue, Oct 12, 2010 at 3:04 PM, Gilles Chanteperdrix
> >> <gilles.chanteperd...@xenomai.org
> >> > Ok: __real_socket is not called, the XENOMAI_SKINCALL3(...) code
> >> > returns zero in this case.
> >>
> >> Ok. zero should be translated in something like 1024 - 128. And the
> >> reverse operation happen in select code.
> >>
> >>
> >> If I understand you correctly, the socket call is returning a valid
> >> Xenomai file descriptor as it should. So, the next question is: why is
> >> this file descriptor (or the corresponding mask) not recognized as such
> >> in select()? Do you have any further suggestions on how to debug this?
> >
> > As I just explained. verify that __wrap_socket returns 1024 - 128, or
> > something like that. And that this value gets translated back to 0 in
> > select code.
>
> Normally, since there is only one file descriptor in the fdset, the test
> which fails should be first_fp_valid_p.
>
I guess you are looking at the kernel code? I was still looking at the user
space code for __wrap_select. The arguments of that function are as
expected: nfds=897, and the bit for file descriptor 896 is set in __readfds.
I guess the XENOMAI_SKINCALL5 macro expands to a kernel call, but sorry I
have little experience with kernel programming. Does this go straight to
the __select function in skins/posix/syscall.c? I can see the
first_fp_valid_p call there.
This is the function where I previously put a printk call. I just checked
dmesg again, and the printk'd message now appears (it seems that `dmesg |
tail -f` isn't working correctly for me, but `dmesg | tail` is). Also, when
I change syscall.c, a `make-kpkg --rootcmd fakeroot --initrd
kernel_image`at the top of the source tree somehow does not rebuild
anything. Until now,
I have done a clean + complete rebuild for the whole kernel for each
change, but that takes quite some time. Is there a better way to do this?
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