1  /* Test backtrace and backtrace_symbols for recursive calls.
       2     Copyright (C) 2010-2023 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>