Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!watmath!orchid!jlee4
From: jlee4@orchid.waterloo.edu (jlee4)
Newsgroups: comp.sys.mac.programmer
Subject: FFlush problem in LSC Debugger
Message-ID: <113@orchid.waterloo.edu>
Date: 15 Jun 89 15:36:47 GMT
Reply-To: jlee4@orchid.waterloo.edu ()
Organization: U. of Waterloo, Ontario
Lines: 27


Hi people.  I just got my 4 Megs of RAM, so I started hacking
away on nethack. When suddenly, the LSC Debugger started barfing
(i.e. Bus Error) when fflush(stdout) was invoked.  This was the
first time it happened (i had used the Debugger before on the
same project 3 months ago with no problems) and now it won't stop.

Symptoms: Only happens in LSC Debugger, if in Finder, or
executing from within app (not Run command) or with
Use Debugger turned off in MultiFinder, it works fine.

System:	Mac II, 5MB, 40MB HD
	LSC and LSC Debugger partitions are set to 700K and 200K
         respectively. Project is set to 700K, use STRS,
	no multifinder flags set, MacsBug symbols only.

Looking at the source for fflush (in std_filepos.c) it seems as if
it doesn't check to see if the file is a Stdio file and gets
trashed when it calls GetVRefNum. When it does work it seemd, to
call the HFS routines, GetVRefNum and PBFlshVol even on stdout!

Should I just add in the patch to check for Stdio files, or what
am I doing wrong.

Johnny Lee
jlee4@orchid.waterloo.edu
watmath!orchid!jlee4