[Mono-list] Re: [Mono-cvs-list] Mono CVS: mono martin

[Martin Baulig]

dietmar <dietmar@ximian.com> writes:

> I doubt that this is correct, because  libpthreads has its own
> implementation of sigaction(), and I think we should call that to ensure
> correct behaviour?

Well, I don't know why this ever worked on Linux without the SYS_sigaction.  From a look
at the glibc source code, it should not:

====[glibc-2.2.5/linuxthreads/signal.c]=====
int __sigaction(int sig, const struct sigaction * act,
              struct sigaction * oact)
{
  struct sigaction newact;
  struct sigaction *newactp;

  if (sig == __pthread_sig_restart ||
      sig == __pthread_sig_cancel ||
      (sig == __pthread_sig_debug && __pthread_sig_debug > 0))
    {
      __set_errno (EINVAL);
      return -1;
    }
  /* .... more stuff below .... */
}
strong_alias(__sigaction, sigaction)
====

That's also how it works on FreeBSD - you cannot install a handler for the thread restart
and cancel signals.

-- 
Martin Baulig
martin@gnome.org
martin@ximian.com