Path: utzoo!mnetor!uunet!husc6!cmcl2!nrl-cmf!ames!pasteur!ucbvax!CORY.BERKELEY.EDU!dillon
From: dillon@CORY.BERKELEY.EDU (Matt Dillon)
Newsgroups: comp.sys.amiga
Subject: Re: DeciGel (was Re: UNIX on the Amiga)
Message-ID: <8803110314.AA15538@cory.Berkeley.EDU>
Date: 11 Mar 88 03:14:32 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Lines: 20

:> >> >Is there a DeciGel-like program to trap and ignore divide-by-zero errors?
:
:> Let's see if the second time it works :-) GET MANX 3.60a.
:
:> 3.60a includes a UNIX-like signal call that can trap the following:
:
:> divide by zero and overflow (SIGFPE)
:> illegal instruction (SIGILL)
:> illegal address or bus error (SIGSEGV)
:
:Wot, no SIGINT or SIGQUIT? Be real easy to redirect _abort() to handle that
:case...

	SIGFPE, SIGILL, and SIGSEGV are synchronous exceptions.  SIGINT
and SIGQUIT are asynchronous interrupts.  The problem with having traps
for SIGINT and SIGQUIT (lets say you defined them as ^C and ^E) is that
you could be interrupting a critical library call.  Exceptions, on the 
otherhand, (usually) occur within a user program.

					-Matt