manual/examples/execinfo.c

   1 /* Obtain a backtrace and print it.
   2    Copyright (C) 1991-2020 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU General Public License
   6    as published by the Free Software Foundation; either version 2
   7    of the License, or (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, see <https://www.gnu.org/licenses/>.
  16 */
  17
  18 #include <execinfo.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21
  22 /* Obtain a backtrace and print it to @code{stdout}. */
  23 void
  24 print_trace (void)
  25 {
  26   void *array[10];
  27   char **strings;
  28   int size, i;
  29
  30   size = backtrace (array, 10);
  31   strings = backtrace_symbols (array, size);
  32   if (strings != NULL)
  33   {
  34
  35     printf ("Obtained %d stack frames.\n", size);
  36     for (i = 0; i < size; i++)
  37       printf ("%s\n", strings[i]);
  38   }
  39
  40   free (strings);
  41 }
  42
  43 /* A dummy function to make the backtrace more interesting. */
  44 void
  45 dummy_function (void)
  46 {
  47   print_trace ();
  48 }
  49
  50 int
  51 main (void)
  52 {
  53   dummy_function ();
  54   return 0;
  55 }