1  /* ttest.c -- Test for libbacktrace library
       2     Copyright (C) 2017-2023 Free Software Foundation, Inc.
       3     Written by Ian Lance Taylor, Google.
       4  
       5  Redistribution and use in source and binary forms, with or without
       6  modification, are permitted provided that the following conditions are
       7  met:
       8  
       9      (1) Redistributions of source code must retain the above copyright
      10      notice, this list of conditions and the following disclaimer.
      11  
      12      (2) Redistributions in binary form must reproduce the above copyright
      13      notice, this list of conditions and the following disclaimer in
      14      the documentation and/or other materials provided with the
      15      distribution.
      16  
      17      (3) The name of the author may not be used to
      18      endorse or promote products derived from this software without
      19      specific prior written permission.
      20  
      21  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
      22  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
      23  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
      24  DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
      25  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
      26  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
      27  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      28  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
      29  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
      30  IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
      31  POSSIBILITY OF SUCH DAMAGE.  */
      32  
      33  /* Test using the libbacktrace library from multiple threads.  */
      34  
      35  #include <assert.h>
      36  #include <stdio.h>
      37  #include <stdlib.h>
      38  #include <string.h>
      39  
      40  #include <pthread.h>
      41  
      42  #include "filenames.h"
      43  
      44  #include "backtrace.h"
      45  #include "backtrace-supported.h"
      46  
      47  #include "testlib.h"
      48  
      49  static int f2 (int) __attribute__ ((noinline));
      50  static int f3 (int, int) __attribute__ ((noinline));
      51  
      52  /* Test that a simple backtrace works.  This is called via
      53     pthread_create.  It returns the number of failures, as void *.  */
      54  
      55  static void *
      56  test1_thread (void *arg ATTRIBUTE_UNUSED)
      57  {
      58    /* Returning a value here and elsewhere avoids a tailcall which
      59       would mess up the backtrace.  */
      60    return (void *) (uintptr_t) (f2 (__LINE__) - 2);
      61  }
      62  
      63  static int
      64  f2 (int f1line)
      65  {
      66    return f3 (f1line, __LINE__) + 2;
      67  }
      68  
      69  static int
      70  f3 (int f1line, int f2line)
      71  {
      72    struct info all[20];
      73    struct bdata data;
      74    int f3line;
      75    int i;
      76  
      77    data.all = &all[0];
      78    data.index = 0;
      79    data.max = 20;
      80    data.failed = 0;
      81  
      82    f3line = __LINE__ + 1;
      83    i = backtrace_full (state, 0, callback_one, error_callback_one, &data);
      84  
      85    if (i != 0)
      86      {
      87        fprintf (stderr, "test1: unexpected return value %d\n", i);
      88        data.failed = 1;
      89      }
      90  
      91    if (data.index < 3)
      92      {
      93        fprintf (stderr,
      94  	       "test1: not enough frames; got %zu, expected at least 3\n",
      95  	       data.index);
      96        data.failed = 1;
      97      }
      98  
      99    check ("test1", 0, all, f3line, "f3", "ttest.c", &data.failed);
     100    check ("test1", 1, all, f2line, "f2", "ttest.c", &data.failed);
     101    check ("test1", 2, all, f1line, "test1_thread", "ttest.c", &data.failed);
     102  
     103    return data.failed;
     104  }
     105  
     106  /* Run the test with 10 threads simultaneously.  */
     107  
     108  #define THREAD_COUNT 10
     109  
     110  static void test1 (void) __attribute__ ((unused));
     111  
     112  static void
     113  test1 (void)
     114  {
     115    pthread_t atid[THREAD_COUNT];
     116    int i;
     117    int errnum;
     118    int this_fail;
     119    void *ret;
     120  
     121    for (i = 0; i < THREAD_COUNT; i++)
     122      {
     123        errnum = pthread_create (&atid[i], NULL, test1_thread, NULL);
     124        if (errnum != 0)
     125  	{
     126  	  fprintf (stderr, "pthread_create %d: %s\n", i, strerror (errnum));
     127  	  exit (EXIT_FAILURE);
     128  	}
     129      }
     130  
     131    this_fail = 0;
     132    for (i = 0; i < THREAD_COUNT; i++)
     133      {
     134        errnum = pthread_join (atid[i], &ret);
     135        if (errnum != 0)
     136  	{
     137  	  fprintf (stderr, "pthread_join %d: %s\n", i, strerror (errnum));
     138  	  exit (EXIT_FAILURE);
     139  	}
     140        this_fail += (int) (uintptr_t) ret;
     141      }
     142  
     143    printf ("%s: threaded backtrace_full noinline\n", this_fail > 0 ? "FAIL" : "PASS");
     144  
     145    failures += this_fail;
     146  }
     147  
     148  int
     149  main (int argc ATTRIBUTE_UNUSED, char **argv)
     150  {
     151    state = backtrace_create_state (argv[0], BACKTRACE_SUPPORTS_THREADS,
     152  				  error_callback_create, NULL);
     153  
     154  #if BACKTRACE_SUPPORTED
     155  #if BACKTRACE_SUPPORTS_THREADS
     156    test1 ();
     157  #endif
     158  #endif
     159  
     160    exit (failures ? EXIT_FAILURE : EXIT_SUCCESS);
     161  }