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From: Georg <dosusb AT googlemail DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: argv[0]
Date: Thu, 8 Dec 2011 13:04:04 -0800 (PST)
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Hi Rod,

thank you for looking into this. I was so happy that I got it working
(on my PC at least) that I did not follow your suggestion.

When I run your code I see that it finds and prints the master
environment block, i.e. the environment of command.com and that does
not contain the absolute path to the running program I am looking for.

>dosmemget(the_psp+0x16, 2, &the_psp);

reads the psp of the parent process and that is command.com. I do not
fully understand the loop but it exits with the psp of command.com and
then reads the environment from there. I can check that with the "mem /
d |more" command.

Georg

By the way this is the output of my program on my PC:

E:\myprogs\djtest>mcb4

MCB:21B0        M PSP:8         Blocksize:1ED
MCB:4090        M PSP:40A       Blocksize:BA    ENV:4CD
Program:COMMAND
MCB:4C40        M PSP:0         Blocksize:7
MCB:4CC0        M PSP:40A       Blocksize:7D
MCB:54A0        M PSP:54B       Blocksize:87A   ENV:D312  Program:DOSX
MCB:DC50        M PSP:FB5       Blocksize:70    Path:E:\MYPROGS\DJTEST
\MCB4.EXE
MCB:E360        M PSP:E37       Blocksize:17D   ENV:DC6  Program:KB16
MCB:FB40        M PSP:FB5       Blocksize:410   ENV:187  Program:MCB4
MCB:13C50       M PSP:0         Blocksize:F00
MCB:22C60       Z PSP:0         Blocksize:7D38
E:\myprogs\djtest>