Date: Mon, 22 Feb 1999 13:34:57 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
X-Sender: eliz AT is
To: Laurynas Biveinis <lauras AT softhome DOT net>
cc: djgpp AT delorie DOT com
Subject: Re: Help : cannot switch screen mode
In-Reply-To: <199902212039.PAA00064@delorie.com>
Message-ID: <Pine.SUN.3.91.990222133218.15762I-100000@is>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Reply-To: djgpp AT delorie DOT com


On Sun, 21 Feb 1999, Laurynas Biveinis wrote:

> #include <conio.h>
> #include <dpmi.h>
> 
> int main(void)
> {
>   __dpmi_regs regs;
>   regs.x.ax = 0x0013;
>   _dpmi_int(0x10, &regs);
>   getch();
>   regs.x.ax = 0x0003;
>   _dpmi_int(0x10, &regs);
>   return 0;
> };

Is this the exact source you compiled?  I don't think so: there's no 
function _dpmi_int in the DJGPP's library, it's __dpmi_int (with two 
leading underscores).  So this source should not even compile.  Please 
post the *exact* source that you compiled, and the exact command line
you used to compile and link it.

> But it doesn't work: on first _dpmi_int call I get:
> 
> Exiting due to signal SIGSEGV
> General Protection Fault at eip=0000002d

This EIP does NOT point to __dpmi_int.  Please run `symify' on the
traceback (see section 9.2 of the DJGPP FAQ list) and post the
results.  Tracebacks without the symbols lack a lot of info that helps
to diagnose such problems.

> cs: sel=01f7  base=833ff000  limit=0005ffff
> ds: sel=01ff  base=833ff000  limit=0005ffff

This indicates that you probably ran your program from another DJGPP
program (like RHIDE), or from Windows.  Is that true?  If so, please try
running it from the DOS command prompt under plain DOS, and if it 
crashes, post the traceback printed by it.