debug/backtrace-tst.c

   1 #include <execinfo.h>
   2 #include <inttypes.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <stdint.h>
   6
   7
   8 static int
   9 compare (const void *p1, const void *p2)
  10 {
  11   void *ba[20];
  12   int n = backtrace (ba, sizeof (ba) / sizeof (ba[0]));
  13   if (n != 0)
  14     {
  15       char **names = backtrace_symbols (ba, n);
  16       if (names != NULL)
  17         {
  18           int i;
  19           printf ("called from %s\n", names[0]);
  20           for (i = 1; i < n; ++i)
  21             printf ("            %s\n", names[i]);
  22           free (names);
  23         }
  24     }
  25
  26   return *(const uint32_t *) p1 - *(const uint32_t *) p2;
  27 }
  28
  29
  30 int
  31 main (int argc, char *argv[])
  32 {
  33   uint32_t arr[20];
  34   size_t cnt;
  35
  36   for (cnt = 0; cnt < sizeof (arr) / sizeof (arr[0]); ++cnt)
  37     arr[cnt] = random ();
  38
  39   qsort (arr, sizeof (arr) / sizeof (arr[0]), sizeof (arr[0]), compare);
  40
  41   for (cnt = 0; cnt < sizeof (arr) / sizeof (arr[0]); ++cnt)
  42     printf ("%" PRIx32 "\n", arr[cnt]);
  43
  44   return 0;
  45 }