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[Caml-list] How to use both select and waitpid ?
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Date: 2001-08-25 (12:54)
From: Berke Durak <berke@a...>
Subject: [Caml-list] Re: How to use both select and waitpid ?
On Fri, Aug 24, 2001 at 03:32:45PM +0200, Gerd Stolpmann wrote:
> For operating systems with POSIX signals, it should work. You need an
> (empty) SIGCHLD signal handler.
> For other operating systems, things may be different. Historically, the BSD
> systems automatically restarted system calls instead of reporting EINTR, and
> you needed to set a flag to avoid that. However, current BSD systems base on
> POSIX signals, too, and restarting does not happen.
> The caml runtime tries to find out whether POSIX signals are available, and
> uses them if possible. If not, it falls back to ANSI-C signals which don't
> specify what to do.
> So your problem depends on the OS, and on whether the caml runtime thinks that
> POSIX signals are available or not. You can check the latter by looking into
> config/s.h (after calling "configure" on the caml sources) and
> checking whether POSIX_SIGNALS is defined.

Thanks ! I've checked config/s.h, POSIX_SIGNALS is indeed defined (I
use OpenBSD 2.9), it works (select raises Unix_error(EINTR,_,_)). I
don't know why it didn't work at work (I used Linux, but that's not
exactly an old BSD system).
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