debug/tst-backtrace3.c

   1 /* Test backtrace and backtrace_symbols for recursive calls.
   2    Copyright (C) 2010-2020 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <execinfo.h>
  20 #include <search.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include "tst-backtrace.h"
  26
  27 /* The backtrace should include at least 3 * fn, and do_test.  */
  28 #define NUM_FUNCTIONS 4
  29
  30 NO_INLINE int
  31 fn (int c)
  32 {
  33   void *addresses[NUM_FUNCTIONS];
  34   char **symbols;
  35   int n;
  36   int i;
  37
  38   if (c > 0)
  39     {
  40       fn (c - 1);
  41       return x;
  42     }
  43   /* Get the backtrace addresses.  */
  44   n = backtrace (addresses, sizeof (addresses) / sizeof (addresses[0]));
  45   printf ("Obtained backtrace with %d functions\n", n);
  46   /*  Check that there are at least four functions.  */
  47   if (n < NUM_FUNCTIONS)
  48     {
  49       FAIL ();
  50       return 1;
  51     }
  52   /* Convert them to symbols.  */
  53   symbols = backtrace_symbols (addresses, n);
  54   /* Check that symbols were obtained.  */
  55   if (symbols == NULL)
  56     {
  57       FAIL ();
  58       return 1;
  59     }
  60   for (i = 0; i < n; ++i)
  61     printf ("Function %d: %s\n", i, symbols[i]);
  62   /* Check that the function names obtained are accurate.  */
  63   for (i = 0; i < n - 1; ++i)
  64     if (!match (symbols[i], "fn"))
  65       {
  66         FAIL ();
  67         return 1;
  68       }
  69   /* Symbol names are not available for static functions, so we do not
  70      check do_test.  */
  71   return x;
  72 }
  73
  74 NO_INLINE int
  75 do_test (void)
  76 {
  77   fn (2);
  78   return ret;
  79 }
  80
  81 #include <support/test-driver.c>