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void cleanup(void) {
  /* delete temporary files, restore consistent state, etc. */
}

int main(void) {
  if (atexit(cleanup); != 0) {
    /* Handle Error */
  }

  /* ... */

  assert(/* something bad didn't happen */);

  /* ... */
}

void cleanup(void) {
  /* delete temporary files, restore consistent state, etc */
}

int main(void) {
  if (atexit(cleanup); != 0) {
    /* Handle Error */
  }

  /* ... */

  if (/* something bad happened */) {
    exit(EXIT_FAILURE);
  }

  /* ... */
}