Date: Tue, 14 Aug 2001 18:22:12 +0300
From: "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>
Sender: halo1 AT zahav DOT net DOT il
To: "Mario Deilmann" <rio_41 AT hotmail DOT com>
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CC: djgpp AT delorie DOT com
In-reply-to: <9lb68u$8j710$1@ID-75293.news.dfncis.de> (rio_41@hotmail.com)
Subject: Re: unwind programs stack !
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> From: "Mario Deilmann" <rio_41 AT hotmail DOT com>
> Newsgroups: comp.os.msdos.djgpp
> Date: Tue, 14 Aug 2001 14:04:34 +0200
> 
> I need the struct member
> 
> __jmp_buf __jmpbuf;         /* Calling environment.  */
> 
> in the defintion of  jmp_buf[1];
> 
> e.g.:
> #include <setjmp.h>
> static jmp_buf  env;
> 
> /*extract the FP from env */
> fp=(void *)env->__jmp_buf[JMPBUF_FP];
> 
> this doesn't work with djgpp's setjmp.h or do I understand something wrong ?

Is FP the so-called ``frame pointer''?  If so, this is the EBP
register, and in DJGPP you need to say simply this:

  fp = (void *)env->__ebp;

That's it!

(A program which uses such intimate details of data structures
internal to the library is highly non-portable, so you shouldn't be
surprised it doesn't work on anything but GNU/Linux.  In fact, I won't
be surprised if it will break on some future Linux system as well.)