#include <execinfo.h>

#include <inttypes.h>

#include <stdio.h>

#include <stdlib.h>

#include <stdint.h>

static int

compare (const void *p1, const void *p2)

{

  void *ba[20];

  int n = backtrace (ba, sizeof (ba) / sizeof (ba[0]));

  if (n != 0)

    {

      char **names = backtrace_symbols (ba, n);

      if (names != NULL)

	{

	  int i;

	  printf ("called from %s\n", names[0]);

	  for (i = 1; i < n; ++i)

	    printf ("            %s\n", names[i]);

	  free (names);

	}

    }

  return *(const uint32_t *) p1 - *(const uint32_t *) p2;

}

int

main (int argc, char *argv[])

{

  uint32_t arr[20];

  size_t cnt;

  for (cnt = 0; cnt < sizeof (arr) / sizeof (arr[0]); ++cnt)

    arr[cnt] = random ();

  qsort (arr, sizeof (arr) / sizeof (arr[0]), sizeof (arr[0]), compare);

  for (cnt = 0; cnt < sizeof (arr) / sizeof (arr[0]); ++cnt)

    printf ("%" PRIx32 "\n", arr[cnt]);

  return 0;

}