Callbacks in CMOD/C and error handling

[Marcus Comstedt (ACROSS) (Hail Ilpalazzo!) @ Pike (-) developers forum]

You need to do this:

  JMP_BUF recovery;
  if (SETJMP(recovery)) {
    /* Something was thrown, value in throw_value */
    UNSETJMP(recovery);
    /* If you're not going to rethrow, you need to free */
    free_svalue(&throw_value);
    mark_free_svalue (&throw_value);
  } else {
    /* Do stuff that can throw */

    UNSETJMP(recovery);
  }