Message-Id:	<3.0.16.19980112143358.2987cd9c@hem1.passagen.se>
Date:	Mon, 12 Jan 1998 14:34:07 -0500
To:	Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
From:	Peter Palotas <blizzar AT hem1 DOT passagen DOT se>
Subject:	Re: Call traceback.
Cc:	djgpp AT delorie DOT com
Mime-Version:	1.0

At 14.41 1998-01-11 +0200, you wrote:
>
>On Fri, 9 Jan 1998, Peter Palotas wrote:
>
>> I was wondering if it is somehow possible to get a call traceback, during
>> the execution of a program, i.e. *without* terminating the program or
>> causing a GPF! (Perhaps even the function names, although this would
>> probably be kind of hard I suppose).
>
>You need to call setjmp with the address of the exception structure
>and then call the equivalent of `do_faulting_finish_message' function
>from the library sources, but with the call to `exit' removed.  An
>untested fragment follows:
>
>	#include <setjmp.h>
>	#include <sys/exceptn.h>
>
>	jmp_buf fake_exception;
>
>	__djgpp_exception_state_ptr = &fake_exception;
>	if (setjmp(__djgpp_exception_state)
>	{
>	   /* Error action.  You shouldn't get here, ever.  */
>	}
>	else
>	  print_traceback();
>
>`print_traceback' should have the code in `do_faulting_finish_message'
>(defined on src/libc/go32/dpmiexcp.c which is in djlsr201.zip) that
>walks the stack frames.
>
>To have the function names printed also, you will need to add to
>`print_traceback' the necessary code from `symify' (also in
>djlsr201.zip).

Thanx a lot! =) Exactly what I was looking for. 

I guess there isn't a portable way of doing this, i.e. a way that would
work with GCC under Linux too??  (If not, do you know how to do this under
Linux?)

-- Peter Palotas alias Blizzar -- blizzar AT hem1 DOT passagen DOT se --

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