gdb/testsuite/gdb.base/signest.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2011-2019 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program 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
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include <signal.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <unistd.h>
  22
  23 volatile char *p = NULL;
  24
  25 extern long
  26 bowler (void)
  27 {
  28   return *p;
  29 }
  30
  31 extern void
  32 keeper (int sig)
  33 {
  34   static int recurse = 0;
  35   if (++recurse < 3)
  36     bowler ();
  37
  38   _exit (0);
  39 }
  40
  41 int
  42 main (void)
  43 {
  44   struct sigaction act;
  45   memset (&act, 0, sizeof act);
  46   act.sa_handler = keeper;
  47   act.sa_flags = SA_NODEFER;
  48   sigaction (SIGSEGV, &act, NULL);
  49   sigaction (SIGBUS, &act, NULL);
  50
  51   bowler ();
  52   return 0;
  53 }