Merge "Return not supported if no necessary socket option"

package com.android.server.connectivity;

import static android.net.SocketKeepalive.DATA_RECEIVED;

import static android.net.SocketKeepalive.ERROR_HARDWARE_UNSUPPORTED;

import static android.net.SocketKeepalive.ERROR_INVALID_SOCKET;

import static android.net.SocketKeepalive.ERROR_SOCKET_NOT_IDLE;

import static android.os.MessageQueue.OnFileDescriptorEventListener.EVENT_ERROR;

import static android.os.MessageQueue.OnFileDescriptorEventListener.EVENT_INPUT;

import static android.system.OsConstants.ENOPROTOOPT;

import static android.system.OsConstants.FIONREAD;

import static android.system.OsConstants.IPPROTO_TCP;

import static android.system.OsConstants.TIOCOUTQ;

            trw = NetworkUtils.getTcpRepairWindow(fd);

        } catch (ErrnoException e) {

            Log.e(TAG, "Exception reading TCP state from socket", e);

            try {

                Os.setsockoptInt(fd, IPPROTO_TCP, TCP_REPAIR, TCP_REPAIR_OFF);

            } catch (ErrnoException ex) {

                Log.e(TAG, "Exception while turning off repair mode due to exception", ex);

            }

            if (e.errno == ENOPROTOOPT) {

                // ENOPROTOOPT may happen in kernel version lower than 4.8.

                // Treat it as ERROR_HARDWARE_UNSUPPORTED.

                throw new InvalidSocketException(ERROR_HARDWARE_UNSUPPORTED, e);

            } else {

                throw new InvalidSocketException(ERROR_INVALID_SOCKET, e);

            }

        } finally {

            dropAllIncomingPackets(fd, false);

        }