lldb/test/API/macosx/ignore_exceptions/main.c

   1 #include <signal.h>
   2 #include <unistd.h>
   3 #include <stdlib.h>
   4 #include <sys/mman.h>
   5 #include <stdio.h>
   6 #include <mach/mach.h>
   7 #include <mach/mach_vm.h>
   8
   9 int *g_int_ptr = NULL;
  10 size_t g_size = 10*sizeof(int);
  11
  12 void
  13 saction_handler(int signo, siginfo_t info, void *baton) {
  14   printf("Got into handler.\n");   // stop here in the signal handler
  15   kern_return_t success
  16       = mach_vm_protect(mach_task_self(), (mach_vm_address_t) g_int_ptr,
  17                         g_size, 0, VM_PROT_READ|VM_PROT_WRITE);
  18   g_int_ptr[1] = 20;
  19 }
  20 int
  21 main()
  22 {
  23   kern_return_t vm_result = vm_allocate(mach_task_self(), &g_int_ptr, g_size, VM_FLAGS_ANYWHERE);
  24   for (int i = 0; i < 10; i++)
  25     g_int_ptr[i] = i * 10;
  26
  27   vm_result = mach_vm_protect(mach_task_self(), (mach_vm_address_t) g_int_ptr, g_size, 0, VM_PROT_NONE);
  28   struct sigaction my_action;
  29   sigemptyset(&my_action.sa_mask);
  30   my_action.sa_handler = (void (*)(int)) saction_handler;
  31   my_action.sa_flags = SA_SIGINFO;
  32
  33   sigaction(SIGBUS, &my_action, NULL); // Stop here to get things going.
  34   int local_value = g_int_ptr[1];
  35   return local_value; // Break here to make sure we got past the signal handler
  36 }