```
ByteBuffer buf = ByteBuffer.allocate(256);
IntBuffer len = IntBuffer.allocate(256);
int ret = SOCKOPT.getsockoptInt(fd.realFileno, intLevel, intOpt, buf, len);
if (ret != 0) {
    throw runtime.newErrnoEINVALError(SOCKOPT.strerror(ret));
}
len.flip();
buf.flip();
ByteList bytes = new ByteList(buf.array(), buf.position(), len.get());
return new Option(runtime, ProtocolFamily.PF_INET, level, opt, bytes);
```