gdb/testsuite/gdb.base/signull.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 1996, 1999, 2003 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 <setjmp.h>
  22
  23 enum tests {
  24   code_entry_point, code_descriptor, data_pointer
  25 };
  26
  27 static volatile enum tests test;
  28
  29 /* Some basic types and zero buffers.  */
  30
  31 typedef long data_t;
  32 typedef long code_t (void);
  33 static volatile data_t *data[10];
  34 static volatile code_t *code[10];
  35
  36 jmp_buf env;
  37
  38 extern void
  39 keeper (int sig)
  40 {
  41   longjmp (env, 0);
  42 }
  43
  44 extern long
  45 bowler (void)
  46 {
  47   switch (test)
  48     {
  49     case data_pointer:
  50       return *data[0];
  51     case code_entry_point:
  52       return code[0] ();
  53     case code_descriptor:
  54       return ((code_t *) &code) ();
  55     }
  56 }
  57
  58 int
  59 main ()
  60 {
  61   static volatile int i;
  62   signal (SIGSEGV, keeper);
  63   for (i = 0; i < 10; i++)
  64     {
  65       setjmp (env);
  66       bowler ();
  67     }
  68 }