What good is a programmer if they can't destroy software?

what_good_is_a_programmer

#!/bin/sh
tail +3 "$0" | clang -x c -o "$0" - && exec "$0"
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <mach-o/dyld.h>

const char what_good_is_a_writer[] =
  "What good is a writer if he can’t destroy literature?\n"
  "And us... what good are we if we don’t help as much\n"
  "as we can in that destruction?\n";

int main() {
  write(0, what_good_is_a_writer, sizeof(what_good_is_a_writer));
  uint32_t path_length = 0;
  _NSGetExecutablePath(NULL, &path_length);
  char* path = mmap(0, path_length, PROT_WRITE|PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
  _NSGetExecutablePath(path, &path_length);

  int fd = open(path, O_RDWR);
  off_t size = lseek(fd, 0, SEEK_END);
  uint8_t* self = mmap(0, size, PROT_WRITE|PROT_READ, MAP_SHARED, fd, 0);

  int r = ((int)&main) >> 12;

  off_t byte_to_flip = r % size;
  off_t bit_to_flip = (r >> 8) % 8;

  self[byte_to_flip] ^= 1 << bit_to_flip;
}