#include <sys/mman.h>
#include <string.h>
int main() {
  char* null="(null)";
  void* addr;

  addr=mmap(0,strlen(null)+1, PROT_READ|PROT_WRITE,
    MAP_SHARED|MAP_FIXED|MAP_ANON, -1, 0);

  if (addr == MAP_FAILED) {
    perror("mmap");
    exit(1);
  }

  strcpy(0,null);

  printf("addr: %x\n", addr);
  printf("string: %s\n", 0);
}