gnu/dist/gdb6/gdb/testsuite/gdb.base/sigbpt.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2004 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 2 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, write to the Free Software
  17    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18    02111-1307, USA.  */
  19
  20 #include <signal.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23
  24 extern void
  25 keeper (int sig)
  26 {
  27 }
  28
  29 volatile long v1 = 0;
  30 volatile long v2 = 0;
  31 volatile long v3 = 0;
  32
  33 extern long
  34 bowler (void)
  35 {
  36   /* Try to read address zero.  Do it in a slightly convoluted way so
  37      that more than one instruction is used.  */
  38   return *(char *) (v1 + v2 + v3);
  39 }
  40
  41 int
  42 main ()
  43 {
  44   static volatile int i;
  45
  46   struct sigaction act;
  47   memset (&act, 0, sizeof act);
  48   act.sa_handler = keeper;
  49   sigaction (SIGSEGV, &act, NULL);
  50
  51   bowler ();
  52   return 0;
  53 }