GDB interaction with sigwait under Redhat 9.0

Paul Hilfinger
Thu May 13 09:33:00 GMT 2004

> On Wed, May 12, 2004 at 04:33:48AM -0400, Paul Hilfinger wrote:
> > 
> > I recently submitted PR threads/1641 concerning a problem we seem to
> > be having with Redhat 9.0 (Linux ... 2.4.21-9.ELsmp #1 SMP Thu Jan 8
> > 17:08:56 EST 2004 i686 i686 i386 GNU/Linux).  It appears that on that
> > system, there is a new, malign interaction of sigwait in the inferior
> > with ptrace.  First, GDB (head version from about mid-April), no
> > longer sees signals sent to an inferior that is waiting on sigwait.  Second,
> > GDB's manipulation with the inferior causes sigwaits (at least on 
> > pthreaded programs) to continue with a non-zero status code (EINTR to 
> > be precise).  Does anyone know anything about this rather drastic change
> > in sigwait's behavior?   I intend to submit a GNU/Linux bug report, unless 
> > someone knows a good reason for this new (apparently undocumented) spec.
> However, you never
> said what version of the Linux kernel you were using - it does not look
> like 2.6 can produce this result.  But then I don't see how an
> unmodified 2.4 can either.

Sorry; I thought the 2.4.21-9.ELsmp part of the uname -a line was 
sufficient.  In fact, not being a kernel hacker myself, I'm not sure what
information you're looking for here.

Paul Hilfinger

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