1  /* Test backtrace and backtrace_symbols.
       2     Copyright (C) 2009-2023 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 f1, f2, f3, and do_test.  */
      28  #define NUM_FUNCTIONS 4
      29  
      30  NO_INLINE void
      31  fn1 (void)
      32  {
      33    void *addresses[NUM_FUNCTIONS];
      34    char **symbols;
      35    int n;
      36    int i;
      37  
      38    /* Get the backtrace addresses.  */
      39    n = backtrace (addresses, sizeof (addresses) / sizeof (addresses[0]));
      40    printf ("Obtained backtrace with %d functions\n", n);
      41    /*  Check that there are at least four functions.  */
      42    if (n < NUM_FUNCTIONS)
      43      {
      44        FAIL ();
      45        return;
      46      }
      47    /* Convert them to symbols.  */
      48    symbols = backtrace_symbols (addresses, n);
      49    /* Check that symbols were obtained.  */
      50    if (symbols == NULL)
      51      {
      52        FAIL ();
      53        return;
      54      }
      55    for (i = 0; i < n; ++i)
      56      printf ("Function %d: %s\n", i, symbols[i]);
      57    /* Check that the function names obtained are accurate.  */
      58    if (!match (symbols[0], "fn1"))
      59      {
      60        FAIL ();
      61        return;
      62      }
      63    /* Symbol names are not available for static functions, so we do not
      64       check f2.  */
      65    if (!match (symbols[2], "fn3"))
      66      {
      67        FAIL ();
      68        return;
      69      }
      70    /* Symbol names are not available for static functions, so we do not
      71       check do_test.  */
      72  }
      73  
      74  NO_INLINE int
      75  fn2 (void)
      76  {
      77    fn1 ();
      78    /* Prevent tail calls.  */
      79    return x;
      80  }
      81  
      82  NO_INLINE int
      83  fn3 (void)
      84  {
      85    fn2();
      86    /* Prevent tail calls.  */
      87    return x;
      88  }
      89  
      90  NO_INLINE int
      91  do_test (void)
      92  {
      93    /* Test BZ #18084.  */
      94    void *buffer[1];
      95  
      96    if (backtrace (buffer, 0) != 0)
      97      FAIL ();
      98  
      99    fn3 ();
     100    return ret;
     101  }
     102  
     103  #include <support/test-driver.c>