12 volatile sig_atomic_t signaled = 0;
17 if (munmap(address, kMmapSize) != 0)
23 void* newaddr = mmap(address, kMmapSize, PROT_READ | PROT_WRITE,
24 MAP_ANON | MAP_FIXED | MAP_PRIVATE, -1, 0);
25 if (newaddr != address)
27 fprintf(stderr, "Newly mmaped address (%p) does not equal old address (%p).\n",
31 *(int*)newaddr = kMagicValue;
36 if (signal(SIGSEGV, handler) == SIG_ERR)
42 address = mmap(NULL, kMmapSize, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0);
43 if (address == MAP_FAILED)
49 // This should first trigger a segfault. Our handler will make the memory readable and write
50 // the magic value into memory.
51 if (*(int*)address != kMagicValue)