1  /* Test unwinding through main.
       2     Copyright (C) 2018-2023 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 <unwind.h>
      20  #include <unistd.h>
      21  #include <support/test-driver.h>
      22  
      23  #if USE_PTHREADS
      24  # include <pthread.h>
      25  # include <error.h>
      26  #endif
      27  
      28  static _Unwind_Reason_Code
      29  callback (struct _Unwind_Context *ctx, void *arg)
      30  {
      31    return _URC_NO_REASON;
      32  }
      33  
      34  static void *
      35  func (void *a)
      36  {
      37    /* Arrange for this test to be killed if _Unwind_Backtrace runs into an
      38       endless loop.  We cannot use the test driver because the complete
      39       call chain needs to be compiled with -funwind-tables so that
      40       _Unwind_Backtrace is able to reach the start routine.  */
      41    alarm (DEFAULT_TIMEOUT);
      42    _Unwind_Backtrace (callback, 0);
      43    return a;
      44  }
      45  
      46  int
      47  main (void)
      48  {
      49  #if USE_PTHREADS
      50    pthread_t thr;
      51    int rc = pthread_create (&thr, NULL, &func, NULL);
      52    if (rc)
      53      error (1, rc, "pthread_create");
      54    rc = pthread_join (thr, NULL);
      55    if (rc)
      56      error (1, rc, "pthread_join");
      57  #else
      58    func (NULL);
      59  #endif
      60  }