Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!purdue!tut.cis.ohio-state.edu!zaphod.mps.ohio-state.edu!sdd.hp.com!hplabs!nsc!taux01!amos
From: amos@taux01.nsc.com (Amos Shapir)
Newsgroups: comp.sys.tahoe
Subject: Re: HCX-9:  "df" dumps core w/ "Illegal instruction"
Message-ID: <4029@taux01.nsc.com>
Date: 12 Jun 90 10:14:47 GMT
References: <23515@uflorida.cis.ufl.EDU>
Organization: National Semiconductor (IC) Ltd, Israel, Home of the 32532
Lines: 23

In article <23515@uflorida.cis.ufl.EDU> dkf@helios.iec.ufl.edu (Dan FitzPatrick) writes:
>	
1)  Is only physically removing the FPP hardware all that is 
>required?  i.e., the installation manual indicates no additional steps
>for the installation of these optional products, so removal should
>be just as easy, correct?

Since not all Tahoes have FPP, the system catches any attempt to execute
an illegal instruction, and if it is a FPP instruction it is emulated;
otherwise, a SIGILL signal is generated, which usually causes the process
to die.

>	3)  Where is the actual source of the message "Illegal Instruction"
>I have run strings on the OS and did not find it here.  However, the
>System Level tests did identify it as a SIGILL signal.

This string is not in the OS but in the shell (your command interpreter,
usually /bin/sh or /bin/csh).  It receives the SIGILL indication through
the system call 'wait' (see man 2) and prints the appropriate error message.

-- 
	Amos Shapir		amos@taux01.nsc.com, amos@nsc.nsc.com
National Semiconductor (Israel) P.O.B. 3007, Herzlia 46104, Israel
Tel. +972 52 522408  TWX: 33691, fax: +972-52-558322 GEO: 34 48 E / 32 10 N