Restoring signal handler when embedded.

When Perl is embedded with another application, like Apache and mod_perl,
can I catch a signal in Perl and then still run the initail signal handler
Apache set?

On a "graceful stop" the Apache parent process sends a USR1 signal to its
children when it wants them to shut down.  The handler sets flags telling
the process to finish.  In mod_perl I'd also like to catch this signal.

I can indeed setup a signal handler in Perl and catch the signal, but then
the Apache handler is not run -- which is what I'd expect.    I tried
looking at the third parameter to POSIX::sigaction, but Perl just returns
"DEFAULT" for the previous handler.  I also tried setting SA_RESETHAND with
the remote hope that it would reset back to the apache handler and I'd just
"re-throw" the signal via kill.  No luck there.

Is it possible in XS to capture the original handler and then either call it
directly on the signal or re-instate the Apache handler  and call "kill $sig
$$"?  And if so, can you point me to an XS example (or perhaps a better
approach)?

My goal is to alter a response from Apache when a graceful stop has been
requested.

Thanks,

-- 
Bill Moseley
[email protected]