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From: okellogg@freenet.de (Oliver Kellogg)
Newsgroups: comp.lang.ada
Subject: Re: GNAT bending signal handlers
Date: 13 May 2003 04:05:59 -0700
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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

(BTW, this is with RedHat 8.0 and its standard gcc suite, i.e.
gnat-3.2.)

--Oliver