37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
#include <signal.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <stdio.h>
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#include <mach/mach.h>
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#include <mach/mach_vm.h>
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int *g_int_ptr = NULL;
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size_t g_size = 10*sizeof(int);
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void
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saction_handler(int signo, siginfo_t info, void *baton) {
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printf("Got into handler.\n"); // stop here in the signal handler
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kern_return_t success
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= mach_vm_protect(mach_task_self(), (mach_vm_address_t) g_int_ptr,
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g_size, 0, VM_PROT_READ|VM_PROT_WRITE);
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g_int_ptr[1] = 20;
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}
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int
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main()
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{
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kern_return_t vm_result = vm_allocate(mach_task_self(), &g_int_ptr, g_size, VM_FLAGS_ANYWHERE);
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for (int i = 0; i < 10; i++)
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g_int_ptr[i] = i * 10;
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vm_result = mach_vm_protect(mach_task_self(), (mach_vm_address_t) g_int_ptr, g_size, 0, VM_PROT_NONE);
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struct sigaction my_action;
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sigemptyset(&my_action.sa_mask);
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my_action.sa_handler = (void (*)(int)) saction_handler;
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my_action.sa_flags = SA_SIGINFO;
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sigaction(SIGBUS, &my_action, NULL); // Stop here to get things going.
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int local_value = g_int_ptr[1];
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return local_value; // Break here to make sure we got past the signal handler
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}
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