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GDB interaction with sigwait under Redhat 9.0
- From: Paul Hilfinger <hilfingr at gnat dot com>
- To: gdb at sources dot redhat dot com
- Date: Wed, 12 May 2004 04:33:48 -0400 (EDT)
- Subject: GDB interaction with sigwait under Redhat 9.0
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.
Thanks.
Paul Hilfinger
Ada Core Technologies, Inc.