Package io.netty.channel.epoll

Class LinuxSocket

java.lang.Object

io.netty.channel.unix.FileDescriptor

io.netty.channel.unix.Socket

io.netty.channel.epoll.LinuxSocket

@UnstableApi
public final class LinuxSocket
extends Socket

A socket which provides access Linux native methods.

Field Summary

Fields

Modifier and Type	Field	Description
private static long	MAX_UINT32_T

Fields inherited from class io.netty.channel.unix.Socket

ipv6, UDS_SUN_PATH_SIZE

Constructor Summary

Constructors

Constructor	Description
LinuxSocket(int fd)

Method Summary

Modifier and Type	Method	Description
private static int	bindVSock(int fd, int cid, int port)
void	bindVSock(VSockAddress address)
private static int	connectVSock(int fd, int cid, int port)
boolean	connectVSock(VSockAddress address)
private static java.net.InetAddress	deriveInetAddress(java.net.NetworkInterface netInterface, boolean ipv6)
(package private) InternetProtocolFamily	family()
private static int	getIntAt(byte[] array, int startIndex)
(package private) java.net.InetAddress	getInterface()
private static int	getInterface(int fd, boolean ipv6)
private static int	getIpMulticastLoop(int fd, boolean ipv6)
(package private) java.net.NetworkInterface	getNetworkInterface()
(package private) PeerCredentials	getPeerCredentials()
private static PeerCredentials	getPeerCredentials(int fd)
(package private) int	getSoBusyPoll()
private static int	getSoBusyPoll(int fd)
(package private) int	getTcpDeferAccept()
private static int	getTcpDeferAccept(int fd)
private static void	getTcpInfo(int fd, long[] array)
(package private) void	getTcpInfo(EpollTcpInfo info)
(package private) int	getTcpKeepCnt()
private static int	getTcpKeepCnt(int fd)
(package private) int	getTcpKeepIdle()
private static int	getTcpKeepIdle(int fd)
(package private) int	getTcpKeepIntvl()
private static int	getTcpKeepIntvl(int fd)
(package private) long	getTcpNotSentLowAt()
private static int	getTcpNotSentLowAt(int fd)
(package private) int	getTcpUserTimeout()
private static int	getTcpUserTimeout(int fd)
(package private) int	getTimeToLive()
private static int	getTimeToLive(int fd)
private static java.net.InetAddress	inetAddress(int value)
private static int	interfaceIndex(java.net.InetAddress address)
private static int	interfaceIndex(java.net.NetworkInterface networkInterface)
(package private) boolean	isIpBindAddressNoPort()
private static int	isIpBindAddressNoPort(int fd)
(package private) boolean	isIpFreeBind()
private static int	isIpFreeBind(int fd)
(package private) boolean	isIpRecvOrigDestAddr()
private static int	isIpRecvOrigDestAddr(int fd)
(package private) boolean	isIpTransparent()
private static int	isIpTransparent(int fd)
(package private) boolean	isLoopbackModeDisabled()
(package private) boolean	isTcpCork()
private static int	isTcpCork(int fd)
(package private) boolean	isTcpQuickAck()
private static int	isTcpQuickAck(int fd)
(package private) boolean	isUdpGro()
private static int	isUdpGro(int fd)
private static void	joinGroup(int fd, boolean ipv6, byte[] group, byte[] interfaceAddress, int scopeId, int interfaceIndex)
(package private) void	joinGroup(java.net.InetAddress group, java.net.NetworkInterface netInterface, java.net.InetAddress source)
private static void	joinSsmGroup(int fd, boolean ipv6, byte[] group, byte[] interfaceAddress, int scopeId, int interfaceIndex, byte[] source)
private static void	leaveGroup(int fd, boolean ipv6, byte[] group, byte[] interfaceAddress, int scopeId, int interfaceIndex)
(package private) void	leaveGroup(java.net.InetAddress group, java.net.NetworkInterface netInterface, java.net.InetAddress source)
private static void	leaveSsmGroup(int fd, boolean ipv6, byte[] group, byte[] interfaceAddress, int scopeId, int interfaceIndex, byte[] source)
VSockAddress	localVSockAddress()
private static byte[]	localVSockAddress(int fd)
static LinuxSocket	newSocket(int fd)
static LinuxSocket	newSocketDgram()
static LinuxSocket	newSocketDgram(boolean ipv6)
static LinuxSocket	newSocketDgram(InternetProtocolFamily family)
static LinuxSocket	newSocketDomain()
static LinuxSocket	newSocketDomainDgram()
static LinuxSocket	newSocketStream()
static LinuxSocket	newSocketStream(boolean ipv6)
static LinuxSocket	newSocketStream(InternetProtocolFamily protocol)
static LinuxSocket	newVSockStream()
(package private) static int	newVSockStream0()
private static int	newVSockStreamFd()
(package private) int	recvmmsg(NativeDatagramPacketArray.NativeDatagramPacket[] msgs, int offset, int len)
(package private) int	recvmsg(NativeDatagramPacketArray.NativeDatagramPacket msg)
VSockAddress	remoteVSockAddress()
private static byte[]	remoteVSockAddress(int fd)
private static long	sendFile(int socketFd, DefaultFileRegion src, long baseOffset, long offset, long length)
(package private) long	sendFile(DefaultFileRegion src, long baseOffset, long offset, long length)
(package private) int	sendmmsg(NativeDatagramPacketArray.NativeDatagramPacket[] msgs, int offset, int len)
private static void	setInterface(int fd, boolean ipv6, byte[] interfaceAddress, int scopeId, int networkInterfaceIndex)
(package private) void	setInterface(java.net.InetAddress address)
(package private) void	setIpBindAddressNoPort(boolean enabled)
private static void	setIpBindAddressNoPort(int fd, int ipBindAddressNoPort)
(package private) void	setIpFreeBind(boolean enabled)
private static void	setIpFreeBind(int fd, int freeBind)
private static void	setIpMulticastLoop(int fd, boolean ipv6, int enabled)
(package private) void	setIpRecvOrigDestAddr(boolean enabled)
private static void	setIpRecvOrigDestAddr(int fd, int transparent)
(package private) void	setIpTransparent(boolean enabled)
private static void	setIpTransparent(int fd, int transparent)
(package private) void	setLoopbackModeDisabled(boolean loopbackModeDisabled)
(package private) void	setNetworkInterface(java.net.NetworkInterface netInterface)
(package private) void	setSoBusyPoll(int loopMicros)
private static void	setSoBusyPoll(int fd, int loopMicros)
(package private) void	setTcpCork(boolean tcpCork)
private static void	setTcpCork(int fd, int tcpCork)
(package private) void	setTcpDeferAccept(int deferAccept)
private static void	setTcpDeferAccept(int fd, int deferAccept)
(package private) void	setTcpFastOpen(int tcpFastopenBacklog)
private static void	setTcpFastOpen(int fd, int tcpFastopenBacklog)
(package private) void	setTcpKeepCnt(int probes)
private static void	setTcpKeepCnt(int fd, int probes)
(package private) void	setTcpKeepIdle(int seconds)
private static void	setTcpKeepIdle(int fd, int seconds)
(package private) void	setTcpKeepIntvl(int seconds)
private static void	setTcpKeepIntvl(int fd, int seconds)
private static void	setTcpMd5Sig(int fd, boolean ipv6, byte[] address, int scopeId, byte[] key)
(package private) void	setTcpMd5Sig(java.net.InetAddress address, byte[] key)
private static void	setTcpNotSentLowAt(int fd, int tcpNotSentLowAt)
(package private) void	setTcpNotSentLowAt(long tcpNotSentLowAt)
(package private) void	setTcpQuickAck(boolean quickAck)
private static void	setTcpQuickAck(int fd, int quickAck)
(package private) void	setTcpUserTimeout(int milliseconds)
private static void	setTcpUserTimeout(int fd, int milliseconds)
(package private) void	setTimeToLive(int ttl)
private static void	setTimeToLive(int fd, int ttl)
(package private) void	setUdpGro(boolean gro)
private static void	setUdpGro(int fd, int gro)

Methods inherited from class io.netty.channel.unix.Socket

accept, bind, connect, disconnect, finishConnect, getIntOpt, getRawOpt, getReceiveBufferSize, getSendBufferSize, getSoError, getSoLinger, getTrafficClass, initialize, isBroadcast, isInputShutdown, isIPv6Preferred, isKeepAlive, isOutputShutdown, isReuseAddress, isReusePort, isShutdown, isTcpNoDelay, listen, localAddress, localDomainSocketAddress, newSocketDgram0, newSocketDgram0, newSocketDgram0, newSocketDomain0, newSocketDomainDgram0, newSocketStream0, newSocketStream0, newSocketStream0, recv, recvAddress, recvFd, recvFrom, recvFromAddress, recvFromAddressDomainSocket, recvFromDomainSocket, remoteAddress, remoteDomainSocketAddress, send, sendAddress, sendFd, sendTo, sendTo, sendToAddress, sendToAddress, sendToAddressDomainSocket, sendToAddresses, sendToAddresses, sendToAddressesDomainSocket, sendToDomainSocket, setBroadcast, setIntOpt, setKeepAlive, setRawOpt, setReceiveBufferSize, setReuseAddress, setReusePort, setSendBufferSize, setSoLinger, setTcpNoDelay, setTrafficClass, shouldUseIpv6, shutdown, shutdown, toString, useIpv6

Methods inherited from class io.netty.channel.unix.FileDescriptor

close, equals, from, from, hashCode, intValue, isOpen, markClosed, pipe, read, readAddress, write, writeAddress, writev, writevAddresses

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

MAX_UINT32_T

private static final long MAX_UINT32_T

See Also:

Constant Field Values

Constructor Detail

LinuxSocket

LinuxSocket(int fd)

Method Detail

family

InternetProtocolFamily family()

sendmmsg

int sendmmsg(NativeDatagramPacketArray.NativeDatagramPacket[] msgs,
             int offset,
             int len)
      throws java.io.IOException

Throws:

java.io.IOException

recvmmsg

int recvmmsg(NativeDatagramPacketArray.NativeDatagramPacket[] msgs,
             int offset,
             int len)
      throws java.io.IOException

Throws:

java.io.IOException

recvmsg

int recvmsg(NativeDatagramPacketArray.NativeDatagramPacket msg)
     throws java.io.IOException

Throws:

java.io.IOException

setTimeToLive

void setTimeToLive(int ttl)
            throws java.io.IOException

Throws:

java.io.IOException

setInterface

void setInterface(java.net.InetAddress address)
           throws java.io.IOException

Throws:

java.io.IOException

setNetworkInterface

void setNetworkInterface(java.net.NetworkInterface netInterface)
                  throws java.io.IOException

Throws:

java.io.IOException

getInterface

java.net.InetAddress getInterface()
                           throws java.io.IOException

Throws:

java.io.IOException

getNetworkInterface

java.net.NetworkInterface getNetworkInterface()
                                       throws java.io.IOException

Throws:

java.io.IOException

inetAddress

private static java.net.InetAddress inetAddress(int value)

joinGroup

void joinGroup(java.net.InetAddress group,
               java.net.NetworkInterface netInterface,
               java.net.InetAddress source)
        throws java.io.IOException

Throws:

java.io.IOException

leaveGroup

void leaveGroup(java.net.InetAddress group,
                java.net.NetworkInterface netInterface,
                java.net.InetAddress source)
         throws java.io.IOException

Throws:

java.io.IOException

interfaceIndex

private static int interfaceIndex(java.net.NetworkInterface networkInterface)

interfaceIndex

private static int interfaceIndex(java.net.InetAddress address)
                           throws java.io.IOException

Throws:

java.io.IOException

setTcpDeferAccept

void setTcpDeferAccept(int deferAccept)
                throws java.io.IOException

Throws:

java.io.IOException

setTcpQuickAck

void setTcpQuickAck(boolean quickAck)
             throws java.io.IOException

Throws:

java.io.IOException

setTcpCork

void setTcpCork(boolean tcpCork)
         throws java.io.IOException

Throws:

java.io.IOException

setSoBusyPoll

void setSoBusyPoll(int loopMicros)
            throws java.io.IOException

Throws:

java.io.IOException

setTcpNotSentLowAt

void setTcpNotSentLowAt(long tcpNotSentLowAt)
                 throws java.io.IOException

Throws:

java.io.IOException

setTcpFastOpen

void setTcpFastOpen(int tcpFastopenBacklog)
             throws java.io.IOException

Throws:

java.io.IOException

setTcpKeepIdle

void setTcpKeepIdle(int seconds)
             throws java.io.IOException

Throws:

java.io.IOException

setTcpKeepIntvl

void setTcpKeepIntvl(int seconds)
              throws java.io.IOException

Throws:

java.io.IOException

setTcpKeepCnt

void setTcpKeepCnt(int probes)
            throws java.io.IOException

Throws:

java.io.IOException

setTcpUserTimeout

void setTcpUserTimeout(int milliseconds)
                throws java.io.IOException

Throws:

java.io.IOException

setIpBindAddressNoPort

void setIpBindAddressNoPort(boolean enabled)
                     throws java.io.IOException

Throws:

java.io.IOException

setIpFreeBind

void setIpFreeBind(boolean enabled)
            throws java.io.IOException

Throws:

java.io.IOException

setIpTransparent

void setIpTransparent(boolean enabled)
               throws java.io.IOException

Throws:

java.io.IOException

setIpRecvOrigDestAddr

void setIpRecvOrigDestAddr(boolean enabled)
                    throws java.io.IOException

Throws:

java.io.IOException

getTimeToLive

int getTimeToLive()
           throws java.io.IOException

Throws:

java.io.IOException

getTcpInfo

void getTcpInfo(EpollTcpInfo info)
         throws java.io.IOException

Throws:

java.io.IOException

setTcpMd5Sig

void setTcpMd5Sig(java.net.InetAddress address,
                  byte[] key)
           throws java.io.IOException

Throws:

java.io.IOException

isTcpCork

boolean isTcpCork()
           throws java.io.IOException

Throws:

java.io.IOException

getSoBusyPoll

int getSoBusyPoll()
           throws java.io.IOException

Throws:

java.io.IOException

getTcpDeferAccept

int getTcpDeferAccept()
               throws java.io.IOException

Throws:

java.io.IOException

isTcpQuickAck

boolean isTcpQuickAck()
               throws java.io.IOException

Throws:

java.io.IOException

getTcpNotSentLowAt

long getTcpNotSentLowAt()
                 throws java.io.IOException

Throws:

java.io.IOException

getTcpKeepIdle

int getTcpKeepIdle()
            throws java.io.IOException

Throws:

java.io.IOException

getTcpKeepIntvl

int getTcpKeepIntvl()
             throws java.io.IOException

Throws:

java.io.IOException

getTcpKeepCnt

int getTcpKeepCnt()
           throws java.io.IOException

Throws:

java.io.IOException

getTcpUserTimeout

int getTcpUserTimeout()
               throws java.io.IOException

Throws:

java.io.IOException

isIpBindAddressNoPort

boolean isIpBindAddressNoPort()
                       throws java.io.IOException

Throws:

java.io.IOException

isIpFreeBind

boolean isIpFreeBind()
              throws java.io.IOException

Throws:

java.io.IOException

isIpTransparent

boolean isIpTransparent()
                 throws java.io.IOException

Throws:

java.io.IOException

isIpRecvOrigDestAddr

boolean isIpRecvOrigDestAddr()
                      throws java.io.IOException

Throws:

java.io.IOException

getPeerCredentials

PeerCredentials getPeerCredentials()
                            throws java.io.IOException

Throws:

java.io.IOException

isLoopbackModeDisabled

boolean isLoopbackModeDisabled()
                        throws java.io.IOException

Throws:

java.io.IOException

setLoopbackModeDisabled

void setLoopbackModeDisabled(boolean loopbackModeDisabled)
                      throws java.io.IOException

Throws:

java.io.IOException

isUdpGro

boolean isUdpGro()
          throws java.io.IOException

Throws:

java.io.IOException

setUdpGro

void setUdpGro(boolean gro)
        throws java.io.IOException

Throws:

java.io.IOException

sendFile

long sendFile(DefaultFileRegion src,
              long baseOffset,
              long offset,
              long length)
       throws java.io.IOException

Throws:

java.io.IOException

bindVSock

public void bindVSock(VSockAddress address)
               throws java.io.IOException

Throws:

java.io.IOException

connectVSock

public boolean connectVSock(VSockAddress address)
                     throws java.io.IOException

Throws:

java.io.IOException

remoteVSockAddress

public VSockAddress remoteVSockAddress()

localVSockAddress

public VSockAddress localVSockAddress()

getIntAt

private static int getIntAt(byte[] array,
                            int startIndex)

deriveInetAddress

private static java.net.InetAddress deriveInetAddress(java.net.NetworkInterface netInterface,
                                                      boolean ipv6)

newSocket

public static LinuxSocket newSocket(int fd)

newVSockStream

public static LinuxSocket newVSockStream()

newVSockStream0

static int newVSockStream0()

newSocketStream

public static LinuxSocket newSocketStream(boolean ipv6)

newSocketStream

public static LinuxSocket newSocketStream(InternetProtocolFamily protocol)

newSocketStream

public static LinuxSocket newSocketStream()

newSocketDgram

public static LinuxSocket newSocketDgram(boolean ipv6)

newSocketDgram

public static LinuxSocket newSocketDgram(InternetProtocolFamily family)

newSocketDgram

public static LinuxSocket newSocketDgram()

newSocketDomain

public static LinuxSocket newSocketDomain()

newSocketDomainDgram

public static LinuxSocket newSocketDomainDgram()

newVSockStreamFd

private static int newVSockStreamFd()

bindVSock

private static int bindVSock(int fd,
                             int cid,
                             int port)

connectVSock

private static int connectVSock(int fd,
                                int cid,
                                int port)

remoteVSockAddress

private static byte[] remoteVSockAddress(int fd)

localVSockAddress

private static byte[] localVSockAddress(int fd)

joinGroup

private static void joinGroup(int fd,
                              boolean ipv6,
                              byte[] group,
                              byte[] interfaceAddress,
                              int scopeId,
                              int interfaceIndex)
                       throws java.io.IOException

Throws:

java.io.IOException

joinSsmGroup

private static void joinSsmGroup(int fd,
                                 boolean ipv6,
                                 byte[] group,
                                 byte[] interfaceAddress,
                                 int scopeId,
                                 int interfaceIndex,
                                 byte[] source)
                          throws java.io.IOException

Throws:

java.io.IOException

leaveGroup

private static void leaveGroup(int fd,
                               boolean ipv6,
                               byte[] group,
                               byte[] interfaceAddress,
                               int scopeId,
                               int interfaceIndex)
                        throws java.io.IOException

Throws:

java.io.IOException

leaveSsmGroup

private static void leaveSsmGroup(int fd,
                                  boolean ipv6,
                                  byte[] group,
                                  byte[] interfaceAddress,
                                  int scopeId,
                                  int interfaceIndex,
                                  byte[] source)
                           throws java.io.IOException

Throws:

java.io.IOException

sendFile

private static long sendFile(int socketFd,
                             DefaultFileRegion src,
                             long baseOffset,
                             long offset,
                             long length)
                      throws java.io.IOException

Throws:

java.io.IOException

getTcpDeferAccept

private static int getTcpDeferAccept(int fd)
                              throws java.io.IOException

Throws:

java.io.IOException

isTcpQuickAck

private static int isTcpQuickAck(int fd)
                          throws java.io.IOException

Throws:

java.io.IOException

isTcpCork

private static int isTcpCork(int fd)
                      throws java.io.IOException

Throws:

java.io.IOException

getSoBusyPoll

private static int getSoBusyPoll(int fd)
                          throws java.io.IOException

Throws:

java.io.IOException

getTcpNotSentLowAt

private static int getTcpNotSentLowAt(int fd)
                               throws java.io.IOException

Throws:

java.io.IOException

getTcpKeepIdle

private static int getTcpKeepIdle(int fd)
                           throws java.io.IOException

Throws:

java.io.IOException

getTcpKeepIntvl

private static int getTcpKeepIntvl(int fd)
                            throws java.io.IOException

Throws:

java.io.IOException

getTcpKeepCnt

private static int getTcpKeepCnt(int fd)
                          throws java.io.IOException

Throws:

java.io.IOException

getTcpUserTimeout

private static int getTcpUserTimeout(int fd)
                              throws java.io.IOException

Throws:

java.io.IOException

getTimeToLive

private static int getTimeToLive(int fd)
                          throws java.io.IOException

Throws:

java.io.IOException

isIpBindAddressNoPort

private static int isIpBindAddressNoPort(int fd)
                                  throws java.io.IOException

Throws:

java.io.IOException

isIpFreeBind

private static int isIpFreeBind(int fd)
                         throws java.io.IOException

Throws:

java.io.IOException

isIpTransparent

private static int isIpTransparent(int fd)
                            throws java.io.IOException

Throws:

java.io.IOException

isIpRecvOrigDestAddr

private static int isIpRecvOrigDestAddr(int fd)
                                 throws java.io.IOException

Throws:

java.io.IOException

getTcpInfo

private static void getTcpInfo(int fd,
                               long[] array)
                        throws java.io.IOException

Throws:

java.io.IOException

getPeerCredentials

private static PeerCredentials getPeerCredentials(int fd)
                                           throws java.io.IOException

Throws:

java.io.IOException

setTcpDeferAccept

private static void setTcpDeferAccept(int fd,
                                      int deferAccept)
                               throws java.io.IOException

Throws:

java.io.IOException

setTcpQuickAck

private static void setTcpQuickAck(int fd,
                                   int quickAck)
                            throws java.io.IOException

Throws:

java.io.IOException

setTcpCork

private static void setTcpCork(int fd,
                               int tcpCork)
                        throws java.io.IOException

Throws:

java.io.IOException

setSoBusyPoll

private static void setSoBusyPoll(int fd,
                                  int loopMicros)
                           throws java.io.IOException

Throws:

java.io.IOException

setTcpNotSentLowAt

private static void setTcpNotSentLowAt(int fd,
                                       int tcpNotSentLowAt)
                                throws java.io.IOException

Throws:

java.io.IOException

setTcpFastOpen

private static void setTcpFastOpen(int fd,
                                   int tcpFastopenBacklog)
                            throws java.io.IOException

Throws:

java.io.IOException

setTcpKeepIdle

private static void setTcpKeepIdle(int fd,
                                   int seconds)
                            throws java.io.IOException

Throws:

java.io.IOException

setTcpKeepIntvl

private static void setTcpKeepIntvl(int fd,
                                    int seconds)
                             throws java.io.IOException

Throws:

java.io.IOException

setTcpKeepCnt

private static void setTcpKeepCnt(int fd,
                                  int probes)
                           throws java.io.IOException

Throws:

java.io.IOException

setTcpUserTimeout

private static void setTcpUserTimeout(int fd,
                                      int milliseconds)
                               throws java.io.IOException

Throws:

java.io.IOException

setIpBindAddressNoPort

private static void setIpBindAddressNoPort(int fd,
                                           int ipBindAddressNoPort)
                                    throws java.io.IOException

Throws:

java.io.IOException

setIpFreeBind

private static void setIpFreeBind(int fd,
                                  int freeBind)
                           throws java.io.IOException

Throws:

java.io.IOException

setIpTransparent

private static void setIpTransparent(int fd,
                                     int transparent)
                              throws java.io.IOException

Throws:

java.io.IOException

setIpRecvOrigDestAddr

private static void setIpRecvOrigDestAddr(int fd,
                                          int transparent)
                                   throws java.io.IOException

Throws:

java.io.IOException

setTcpMd5Sig

private static void setTcpMd5Sig(int fd,
                                 boolean ipv6,
                                 byte[] address,
                                 int scopeId,
                                 byte[] key)
                          throws java.io.IOException

Throws:

java.io.IOException

setInterface

private static void setInterface(int fd,
                                 boolean ipv6,
                                 byte[] interfaceAddress,
                                 int scopeId,
                                 int networkInterfaceIndex)
                          throws java.io.IOException

Throws:

java.io.IOException

getInterface

private static int getInterface(int fd,
                                boolean ipv6)

getIpMulticastLoop

private static int getIpMulticastLoop(int fd,
                                      boolean ipv6)
                               throws java.io.IOException

Throws:

java.io.IOException

setIpMulticastLoop

private static void setIpMulticastLoop(int fd,
                                       boolean ipv6,
                                       int enabled)
                                throws java.io.IOException

Throws:

java.io.IOException

setTimeToLive

private static void setTimeToLive(int fd,
                                  int ttl)
                           throws java.io.IOException

Throws:

java.io.IOException

isUdpGro

private static int isUdpGro(int fd)
                     throws java.io.IOException

Throws:

java.io.IOException

setUdpGro

private static void setUdpGro(int fd,
                              int gro)
                       throws java.io.IOException

Throws:

java.io.IOException