elf/tst-unwind-ctor-lib.c

   1 /* Unit test for _Unwind_Backtrace in a shared object constructor.
   2    Copyright (C) 2018-2021 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
  22 static _Unwind_Reason_Code
  23 callback (struct _Unwind_Context *ctx, void *arg)
  24 {
  25   return _URC_NO_REASON;
  26 }
  27
  28 static void
  29 __attribute__ ((constructor))
  30 do_unwind (void)
  31 {
  32   /* Arrange for this test to be killed if _Unwind_Backtrace runs into an
  33      endless loop.  We cannot use the test driver since the test needs to
  34      run in a constructor.  */
  35   alarm (20);
  36   _Unwind_Backtrace (callback, 0);
  37 }
  38
  39 void
  40 dummy (void)
  41 {
  42 }