Subj : Debugging MakeNL
To   : All
From : andrew clarke
Date : Fri Jul 27 2018 01:25:02

This month I finally managed to get a usable installation of eComStation 
running under VirtualBox in Linux. It's amazing how many old installers want to 
modify CONFIG.SYS which causes OS/2 to become unbootable due to system DLL 
version mismatches, etc.

The VirtualBox Additions work well, so I can copy & paste between Linux and 
OS/2 using the shared clipboard. Very cool. Also I finally worked out how to 
connect OS/2 to a Samba share.

Anyway, I've ported MakeNL to IBM VisualAge for OS/2 and in the process managed 
to code a workaround for the crash in the Watcom OS/2 version. See the recent 
CVS commits. I suspect I've just hidden the problem though.

Probably related, I'm seeing segfaults with the EMX version:

[c:\src\makenl\src]del outfile\testnet.242
Deleting C:\src\makenl\src\outfile\testnet.242
     1 file deleted           1,024 bytes freed

[c:\src\makenl\src]makenl.exe
MakeNL 3.3.6 (EMX) compiled with GNU C on Aug 24 2013 01:04:51
MakeNL started
Cmdline: C:\src\makenl\src\makenl.exe
Using 'makenl.ctl' in 'C:\src\makenl\src'
Begin processing 'testnet.' -- 1:11, Saturday, August 24, 2013

Process terminated by SIGSEGV
core dumped

[c:\src\makenl\src]del outfile\testnet.242
Deleting C:\src\makenl\src\outfile\testnet.242
     1 file deleted           1,024 bytes freed

[c:\src\makenl\src]gdb makenl.exe
GDB is free software and you are welcome to distribute copies of it
 under certain conditions; type "show copying" to see the conditions.
There is absolutely no warranty for GDB; type "show warranty" for details.
GDB 4.16 (emx), Copyright 1996 Free Software Foundation, Inc...
Starting program: c:/src/makenl/src/makenl.exe
[New thread 1]

Program received signal SIGSEGV, Segmentation fault.
[Switching to thread 1]

Program received signal SIGSEGV, Segmentation fault.
0x1e989 in closedir ()
(gdb) bt
#0  0x1e989 in closedir ()
#1  0x19d93 in os_findfirst (pff=0x283f64c, path=0x36b58 "200",
    mask=0x283f54c "*.msg") at osgnufnd.c:36
#2  0x18c78 in SearchMaxMSG (path=0x36b58 "200") at msgtool.c:86
#3  0x1912c in OpenMSGFile (address=0x3600c,
    filename=0x335f0 "C:\\src\\makenl\\src\\outfile\\testnet.242")
    at msgtool.c:167
#4  0x16d14 in main (argc=1, argv=0x283ffd0) at makenl.c:329

[c:\src\makenl\src]grep -n SearchMaxMSG *.c | grep :167
msgtool.c:167:    MSGnum = SearchMaxMSG(MessageDir);

Clearly another part of the code is corrupting MessageDir.

I saw this bug in the Turbo C (DOS) version too a few weeks back, but there's 
obviously no memory protection there, so I wasn't sure how to begin to debug 
it.

Anyway, progress. :-)

--- GoldED+/BSD 1.1.5-b20110223-b20110223
 * Origin: Blizzard of Ozz, Melbourne, Victoria, Australia (3:633/267)

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