elf/tst-unwind-main.c

   1 /* Test unwinding through main.
   2    Copyright (C) 2018-2020 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 <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 }