Re: [SYSTEM]Problems with Linux GDB

From: George (
Date: 01/18/99

On Mon, 18 Jan 1999, Angus Mezick wrote:

>you missed the point of the message that I sent, the backtrace
>will not show the level at which the mud crashed, just the function
>that called the function that crashed and the signal handler that
>catches the crash.  the REALLY important data is missing. :(

I was thinking:

  /* special in room? */
  if (GET_ROOM_SPEC(ch->in_room) != NULL)
    if (GET_ROOM_SPEC(ch->in_room) (ch, world + ch->in_room, cmd, arg))
      return 1;
log("not room");
  /* special in equipment list? */
  for (j = 0; j < NUM_WEARS; j++)
    if (GET_EQ(ch, j) && GET_OBJ_SPEC(GET_EQ(ch, j)) != NULL)
      if (GET_OBJ_SPEC(GET_EQ(ch, j)) (ch, GET_EQ(ch, j), cmd, arg))
        return 1;
log("not equip");


Another cute thing to do is use this as your signal 11 handler:

void sigsegv(int x)
  fprintf(stderr, "%ld:%d: ", pthread_self(), x);

  fprintf(stderr, "<%p> ", __builtin_return_address(0));
  fprintf(stderr, "<%p> ", __builtin_return_address(1));
  fprintf(stderr, "<%p> ", __builtin_return_address(2));
  fprintf(stderr, "<%p> ", __builtin_return_address(3));
  fprintf(stderr, "<%p>\n", __builtin_return_address(4));

  signal(SIGSEGV, SIG_DFL);

It may work better... may not.  Probably want to remove the pthread_self()
call up there unless you're threaded. (And the argument _must_ be a
constant above.)

George Greer

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