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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: GNAT bending signal handlers
Date: 13 May 2003 09:34:48 -0400
Organization: The World Public Access UNIX, Brookline, MA
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okellogg@freenet.de (Oliver Kellogg) writes:

> Mark Johnson <mark_h_johnson@raytheon.com> wrote in message news:<3EBFDAB9.441F858D@raytheon.com>...
> > 
> > I suggest a look at the "super secret" GNAT Reference Manual for this
> > answer. Look for Pragma Interrupt_State (or simply search for "signal")
> > to see why various signals are required to implement Ada exceptions.
> 
> Hm, I can't find anything on a pragma Interrupt_State
> (looked in gnat-3.15p-unx-docs as well as
> http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ada/gnat_rm.texi?rev=1.12&content-type=text/x-cvsweb-markup
> , also searched for "signal".)
> 
> Anyway, I tried adding the following at the start of the main program:
> 
>  System.Interrupt_Management.Operations.Install_Default_Action
>    (System.Interrupt_Management.Interrupt_ID
> (System.OS_Interface.SIGSEGV));
> 
> but it doesn't change the behavior, apparently because
> 
>  System.Interrupt_Management.Reserve (System.OS_Interface.SIGSEGV) =
> True

GNAT supports a pragma Unreserve_All_Interrupts, which I found to be
necessary when I wanted to handle SIGINT.  I don't know if that's
related to your problem...

- Bob