[LTP] signal() failed for signal 34.

[<Chr...@ar...>]

Hi,

I've tried running the system calls tests from the LTP (ltp-full-20031106)
on ARM Linux and a large number of them fail.  Most of them fail with
exactly the same error:
WARN   :   signal() failed for signal 34. error:22 Invalid argument

This appears to happen because lots of the tests call tst_sig from their
setup functions.  tst_sig then calls tst_setup_signal which calls
sigaction.  If linuxthreads is present then the following piece of code is
inside the __sigaction function in glibc/linuxthreads/signals.c:

  if (sig == __pthread_sig_restart ||
      sig == __pthread_sig_cancel ||
      (sig == __pthread_sig_debug && __pthread_sig_debug > 0))
    {
      __set_errno (EINVAL);
      return -1;
    }

The problem is that tst_sig tries to assign an action to a signal with the
same number as __pthread_sig_debug.  It seems that __pthread_sig_debug is
greater than 0 as long as real-time signals are available.

Anyone have any ideas on how to fix this in the test harness, and why it
hasn't been noticed on other versions of linux with LTP?

Thanks.

--
Chris Pedley,  Graduate Engineer
Intellectual Property Products Division
ARM Ltd, 110 Fulbourn Rd, Cambridge CB1 9NJ UK
Tel : +44 1223 400847     Fax: +44 1223 400410

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