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 #include <stdlib.h>
  23
  24 enum tests {
  25   code_entry_point, code_descriptor, data_pointer
  26 };
  27
  28 static volatile enum tests test;
  29
  30 /* Some basic types and zero buffers.  */
  31
  32 typedef long data_t;
  33 typedef long code_t (void);
  34 static volatile data_t *data[10];
  35 static volatile code_t *code[10];
  36
  37 sigjmp_buf env;
  38
  39 extern void
  40 keeper (int sig)
  41 {
  42   siglongjmp (env, 0);
  43 }
  44
  45 extern long
  46 bowler (void)
  47 {
  48   switch (test)
  49     {
  50     case data_pointer:
  51       return *data[0];
  52     case code_entry_point:
  53       return code[0] ();
  54     case code_descriptor:
  55       return ((code_t *) &code) ();
  56     }
  57 }
  58
  59 int
  60 main ()
  61 {
  62   static volatile int i;
  63
  64   struct sigaction act;
  65   memset (&act, 0, sizeof act);
  66   act.sa_handler = keeper;
  67   sigaction (SIGSEGV, &act, NULL);
  68
  69   for (i = 0; i < 10; i++)
  70     {
  71       sigsetjmp (env, 1);
  72       bowler ();
  73     }
  74 }