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From: hamilton@uxc.cso.uiuc.edu
Newsgroups: comp.sys.amiga
Subject: Re: Format of libraries on disk
Message-ID: <172200059@uxc.cso.uiuc.edu>
Date: Sun, 24-May-87 16:53:00 EDT
Article-I.D.: uxc.172200059
Posted: Sun May 24 16:53:00 1987
Date-Received: Tue, 26-May-87 01:40:09 EDT
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Nf-ID: #R:<8705231146.AA11986@ingres.Berke:-40:uxc.cso.uiuc.edu:172200059:000:1009
Nf-From: uxc.cso.uiuc.edu!hamilton    May 24 15:53:00 1987


hatcher@INGRES asks:
> I've been trying to figure out how you can look at the contents of a
> library file and determine that it is indeed a library, and not a
> "real" executable (they both start with magic number 0x000003f3).

    well, if the first thing in the first hunk looks like:

	MOVEQ	#0,D0
	RTS

it's a good bet you've got a library, not a program.  another thing
to look for is the magic number $4AFC, an illegal opcode that is used
to flag the presence of a Resident structure.

> Question two: although I have a list of info about gurus online, I was
> surprised that I couldn't seem to find that documented in the RKM (or
> anywhere else), either...

    your info probably came from the include file exec/alerts.[ih].

	wayne hamilton
	U of Il and US Army Corps of Engineers CERL
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