From: "Paul Hooper" <unitech AT execpc DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: HELP! INT21 - 3D problem!!!!
Date: 8 Mar 1997 04:55:05 GMT
Organization: Exec-PC BBS Internet - Milwaukee, WI
Lines: 31
Message-ID: <01bc2b7c$ce3fad70$7229cfa9@p590>
NNTP-Posting-Host: delaware.execpc.com
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

Hello:

	HERE IS A GOOD ONE!  I have been racking of what little is left of my
brains over this problem.  Can someone tell me what is going on??  I cannot
get a simple Int21 function 3D  (open a file to work), using the CWSDPMI. 
I have simplified the problem down to the very simple piece of code below. 
You
will need to run it through a debugger (I used FSDB) to see the results. 
All this code does is try to open the file "ZZZ" in the current directory
for read access.  This code works (Carry flag is 0 after int 21)under QDPMI
but fails (Carry flag is 1 after int 21) with CWSDPMI.  Remember to create
a file named ZZZ before running the test.  

I really look forward to hearing from someone about this.  I feel like I am
missing.something really obvious.

Thanks
Paul Hooper
unitech AT execpc DOT com

char *filename = "ZZZ";
int main(int argc, char *argv[])
{
asm ("movb   $0x00,%al\n\t"
	"movb   $0x3d,%ah\n\t"
	"movl   _filename,%edx\n\t"
	"int    $0x21\n\t");

	return 0;
}