To:	djgpp AT delorie DOT com
Date:	Thu, 27 Apr 2000 06:55:08 0000
From:	"nimrod a. abing" <synflood AT eudoramail DOT com>
Message-ID:	<HGDBJFBPCNDMAAAA@shared1-mail.whowhere.com>
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Subject:	Re: gdb problem or just silly me - please help
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Reply-To:	djgpp AT delorie DOT com

On Wed, 26 Apr 2000 01:18:45   Damian Yerrick wrote:

>Unless the printf() family function itself crashes the program.  This
>happens to me all the time when porting Allegro programs from DJGPP to
>Windows, as DirectX is somewhat finicky about when the screen can be
>drawn on.  However, fprintf() to a logfile works fine.
>


for those who are curious, here's how to do it (crash
the program using printf ;-)

step 1. create two c source files:

save as file1.c:
/* start of file1.c */
char *a_string_array[] = {
  "Now is the time for all good men",
  "To destroy the earth",
  "And have beer parties across the galaxy.",
  ""
};
/* end of file1.c */

save as file2.c:

/* start of file2.c */
#include <stdio.h>


/* should be:
extern char *a_string_array[]; 
*/
extern char **a_string_array;


int main(void)
{
  int i=0;
  char *a_string;
  

  a_string = a_string_array[i];
  while (a_string[0])
    {
      printf("%s\n", a_string);
      i++;
      a_string = a_string_array[i];
    }
  
  return 0;
}
/* end of file2.c */

step 2. compile:
$ gcc -o test.exe file1.c file2.c

step 3. execute:
$ ./test

step 4. start hair pulling

Exiting due to signal SIGSEGV
General Protection Fault at eip=00001629
eax=20776f4e ebx=00008318 ecx=00000000 edx=20776f4e esi=00000054 edi=0000f148
ebp=00683fe0 esp=00683fc8 program=D:\PROJECTS\DJGPP\QUICKIES\TEST.EXE
cs: sel=012f  base=8318a000  limit=00683fff
ds: sel=0137  base=8318a000  limit=00683fff
es: sel=0137  base=8318a000  limit=00683fff
fs: sel=010f  base=000121d0  limit=0000ffff
gs: sel=0147  base=00000000  limit=0010ffff
ss: sel=0137  base=8318a000  limit=00683fff
App stack: [00684000..00604000]  Exceptn stack: [0000f0a8..0000d168]

Call frame traceback EIPs:
  0x00001629 _main+37
  0x00002a02 ___crt1_startup+178

$ symify test.exe
$ (huh!)

ponder upon ye abstraction...


---
nimrod_a_abing

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