Message-Id:	<3.0.5.32.19980722153436.0099e970@hal.nt.tuwien.ac.at>
Date:	Wed, 22 Jul 1998 15:34:36 +0200
To:	djgpp AT delorie DOT com
From:	Anton Helm <tony AT nt DOT tuwien DOT ac DOT at>
Subject:	djgpp and WinNT 4.0 summary of problems
Mime-Version:	1.0

I've been using djgpp v2.01 with WinNT 4.0 for a while
and found some mysterious problems. None of them is really
critical, but they are annoying and maybe someone knows
how to deal with them. 

Here is a little summary:

1) * djgpp compiled program running
   * hit Ctrl-C
   
   The probability for normal djgpp behavior is about 10%.
   In 90% of the Ctrl-C hits WinNT catches a protection error,
   kills the DOS-Window and produces a Dr.Watson message.
   I haven't yet found out what causes the 10% of normal behavior.
   (Same behavior with your SIGQUIT test code, Eli.)

2) * runtime error in djgpp compiled programs (e.g. NULL pointer
   dereference)

   The program stops, prints the message "Abort!" in the next line
   and returns to the DOS prompt. No stack traceback etc., just "Abort!".

   (probably a "feature" of the WinNT DPMI service?)

3) * running gdb
   * debugged program has the above runtime error
   * run program
   
   Again "Abort!" is printed, and the gdb message is
   "Program exited normally" (!!!)


4) * running NC (norton commander, dos version) in a DOS-Window and gdb
   (from inside NC). 
   * run program as above

   behavior as in 3.
 
   * enter 'quit'

   gdb exits to DOS prompt (NOT to NC) and the working directory changes
   to the one before invoking NC.


BTW: gdb reads source files from the directories given with the 'dir'
command (defaults to compile-dir and cwd). Do djgpp executables
contain the compile-dir info? gdb never finds the sources for
programs without explicit 'dir' command. (I haven't tested this with plain DOS.)
I've tried strings on the *.exe file but did't find any directory info.


If you have any hints, questions etc. feel free to contact me by mail.

As I will be on holidays from friday july 24th 12.00 on, messages received
later will not be read until september. I will unsubscribe the mailing list 
during holidays to avoid overflowing my mailbox, so 
PLEASE MAIL A COPY TO MY PRIVATE MAIL ADDRESS.


Regards, and have a nice summer,

Tony







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Dipl.-Ing. Anton HELM   *T*  mailto:tony AT nt DOT tuwien DOT ac DOT at
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