Re: A signal fairy tale

Christopher Smith
2001-06-27T18:18:33Z

--On Wednesday, June 27, 2001 11:18:28 +0200 Jamie Lokier
<lk@tantalophile.demon.co.uk> wrote:
> Btw, this functionality is already available using sigaction(). Just
> search for a signal whose handler is SIG_DFL. If you then block that
> signal before changing, checking the result, and unblocking the signal,
> you can avoid race conditions too. (This is what my programs do).

It's more than whether a signal is blocked or not, unfortunately. Lots of
applications will invoke sigwaitinfo() on whatever the current signal mask
is, which means you can't rely on sigaction to solve your problems. :-(

--Chris