Re: A signal fairy tale

From: Christopher Smith (
Date: Wed Jun 27 2001 - 13:16:08 EST

--On Wednesday, June 27, 2001 11:18:28 +0200 Jamie Lokier
<> 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. :-(

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This archive was generated by hypermail 2b29 : Sat Jun 30 2001 - 21:00:17 EST