Date: Sat, 12 Mar 94 17:12:43 EST
From: peprbv AT cfa0 DOT harvard DOT edu (Bob Babcock)
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: How do you debug a debugger?
Reply-To: babcock AT cfa DOT harvard DOT edu

I've been trying to use either the standard djgpp debugger or sally to debug
under os/2.  I find that I get a "segmentation violation in pointer" message
as soon as I step into _main.  Symify indicates that the error with sally
occurs in add_file; the standard debugger doesn't seem to have debug info
included, but I think it's the same problem in both.  Both debuggers work
under DOS (VCPI mode), and I am using the dpmi versions under os/2.  I have
installed the maint1,2,3 patches.  The program being debugged has a fair
amount of debug info.  The file is 150K without debug info, 760K with debug
info.  Any suggestions?

I also found two problems in sally (fsdb090.zip):
1. The call to sleep(1) in fullscr.c crashes under dpmi.  I don't know why so
   I just commented out that call.  I think it just holds the "about" message
   on screen for 1 second at startup and isn't used again.
2. Only the gray keypad keys work on my keyboard, the white keypad is ignored.