bool

static VALUE
sockopt_bool(VALUE self)
{
    int i;
    VALUE data = sockopt_data(self);
    StringValue(data);
    if (RSTRING_LEN(data) != sizeof(int))
        rb_raise(rb_eTypeError, "size differ.  expected as sizeof(int)=%d but %ld",
                 (int)sizeof(int), (long)RSTRING_LEN(data));
    memcpy((char*)&i, RSTRING_PTR(data), sizeof(int));
    return i == 0 ? Qfalse : Qtrue;
}