Windows Socket I/O模型之重叠I/O事件通知模式

# include < winsock2. h>
# include < ws2tcpip. h>
# include < mswsock. h>
# include < windows. h>
# include "resolve.h"
# include "public.h"
typedef SINGLE_LIST_HEADER SocketObjHeader;
typedef SINGLE_LIST SocketObj;
typedef SINGLE_LIST_HEADER ThreadObjHeader;
typedef SINGLE_LIST ThreadObj;
typedef DOUBLE_LIST_HEADER BufferObjHeader;
typedef DOUBLE_LIST BufferObj;
# define DEFAULT_OVERLAPPED_COUNT 5
struct _SOCKET_OBJ;
struct _THREAD_OBJ;
int gOverlappedCount = DEFAULT_OVERLAPPED_COUNT;
typedef struct _BUFFER_OBJ_EX {
WSAOVERLAPPED ol; // Overlapped structure
SOCKET sclient; // Used for AcceptEx client socket
char * buf; // Buffer for send/recv/AcceptEx
int buflen; // Length of the buffer
int operation; // Type of operation submitted
# define OP_ACCEPT 0 // AcceptEx
# define OP_READ 1 // WSARecv/WSARecvFrom
# define OP_WRITE 2 // WSASend?WSASendTo
struct _SOCKET_OBJ * Socket ; // SOCKET_OBJ that this I/O belongs to
struct _THREAD_OBJ * Thread; // THREAD_OBJ this I/O is assigned to
SOCKADDR_STORAGE addr; // Remote address (UDP)
int addrlen; // Remote address length
BufferObj bufDList;
} BUFFER_OBJ_EX;
typedef struct _SOCKET_OBJ
{
SOCKET s; // Socket handle for client connection
int af, // Address family of socket (AF_INET or AF_INET6)
bClosing; // Indicates socket is closing
volatile LONG OutstandingOps; // Number of outstanding overlapped ops
BUFFER_OBJ_EX * * PendingAccepts; // Array of pending AcceptEx calls (listening socket only)
// Pointers to Microsoft specific extensions (listening socket only)
LPFN_ACCEPTEX lpfnAcceptEx;
LPFN_GETACCEPTEXSOCKADDRS lpfnGetAcceptExSockaddrs;
CRITICAL_SECTION SockCritSec; // Synchronize access to this SOCKET_OBJ
SocketObj next; // Used to chain SOCKET_OBJ together
} SOCKET_OBJ;
typedef struct _THREAD_OBJ
{
DOUBLE_LIST_HEADER BufferList; // Linked list of all sockets allocated
int EventCount; // How many events are in the array to wait on?
HANDLE Event; // Used to signal new clients assigned
// to this thread
HANDLE Thread; // Handle to the curren thread
HANDLE Handles[ MAXIMUM_WAIT_OBJECTS] ; // Array of socket's event handles
CRITICAL_SECTION ThreadCritSec; // Protect access to SOCKET_OBJ lists
ThreadObj next; // Next thread object in list
} THREAD_OBJ;
CRITICAL_SECTION gThreadListCritSec;
ThreadObjHeader threadobjHeader;
void AssignIoToThread( BUFFER_OBJ_EX * buf) ;
SOCKET_OBJ * GetSocketObj( SOCKET s, int af) {
SOCKET_OBJ * sockobj = NULL ;
sockobj = ( SOCKET_OBJ * ) HeapAlloc( GetProcessHeap( ) , HEAP_ZERO_MEMORY, sizeof ( SOCKET_OBJ) ) ;
if ( sockobj = = NULL )
{
fprintf ( stderr , "GetSocketObj: HeapAlloc failed: %d/n" , GetLastError( ) ) ;
ExitProcess( - 1) ;
}
sockobj- > s = s;
sockobj- > af = af;
InitializeCriticalSection( & sockobj- > SockCritSec) ;
return sockobj;
}
void FreeSocketObj( SOCKET_OBJ * obj)
{
BUFFER_OBJ * ptr= NULL ,
* tmp= NULL ;
if ( obj- > OutstandingOps ! = 0)
{
return ;
}
if ( obj- > s ! = INVALID_SOCKET)
{
closesocket( obj- > s) ;
obj- > s = INVALID_SOCKET;
}
DeleteCriticalSection( & obj- > SockCritSec) ;
HeapFree( GetProcessHeap( ) , 0, obj) ;
}
BUFFER_OBJ_EX * GetBufferObjEx( SOCKET_OBJ * sock, int buflen) {
BUFFER_OBJ_EX * newobj = NULL ;
newobj = ( BUFFER_OBJ_EX * ) HeapAlloc( GetProcessHeap( ) , HEAP_ZERO_MEMORY, sizeof ( BUFFER_OBJ_EX) ) ;
if ( newobj = = NULL )
{
fprintf ( stderr , "GetBufferObj: HeapAlloc failed: %d/n" , GetLastError( ) ) ;
ExitProcess( - 1) ;
}
newobj- > buf = ( char * ) HeapAlloc( GetProcessHeap( ) , HEAP_ZERO_MEMORY, sizeof ( BYTE) * buflen) ;
if ( newobj- > buf = = NULL )
{
fprintf ( stderr , "GetBufferObj: HeapAlloc failed: %d/n" , GetLastError( ) ) ;
ExitProcess( - 1) ;
}
newobj- > buflen = buflen;
newobj- > addrlen = sizeof ( newobj- > addr) ;
newobj- > Socket = sock;
newobj- > ol. hEvent = WSACreateEvent( ) ;
if ( newobj- > ol. hEvent = = NULL ) {
fprintf ( stderr , "WSACreateEvent failed./n" ) ;
ExitProcess( - 1) ;
}
return newobj;
}
BUFFER_OBJ_EX * FindBufferObjEx( THREAD_OBJ * thread, WSAEVENT hEvent) {
BufferObj * ptr= NULL ;
BUFFER_OBJ_EX * bufobj = NULL ;
EnterCriticalSection( & thread- > ThreadCritSec) ;
ptr = ( BufferObj * ) GotoNextDoubleList( & ( thread- > BufferList) , & ( thread- > BufferList. head) ) ;
while ( ptr) {
bufobj = ( BUFFER_OBJ_EX * ) container_of( BUFFER_OBJ_EX, bufDList, ptr) ;
if ( bufobj- > ol. hEvent = = hEvent)
break ;
ptr = ( BufferObj * ) GotoNextDoubleList( & ( thread- > BufferList) , ptr) ;
}
LeaveCriticalSection( & thread- > ThreadCritSec) ;
return bufobj;
}
void FreeBufferObjEx( BUFFER_OBJ_EX * obj)
{
// Close the event
WSACloseEvent( obj- > ol. hEvent) ;
obj- > ol. hEvent = NULL ;
// Free the buffers
HeapFree( GetProcessHeap( ) , 0, obj- > buf) ;
HeapFree( GetProcessHeap( ) , 0, obj) ;
}
int InsertBufferObjExToThread( THREAD_OBJ * thread, BUFFER_OBJ_EX * buf) {
int ret;
EnterCriticalSection( & thread- > ThreadCritSec) ;
if ( thread- > EventCount < MAXIMUM_WAIT_OBJECTS - 1) {
EnqueueDoubleList( & ( thread- > BufferList) , & ( buf- > bufDList) ) ;
thread- > Handles[ thread- > EventCount+ + ] = buf- > ol. hEvent;
ret = NO_ERROR;
} else {
ret = SOCKET_ERROR;
}
LeaveCriticalSection( & thread- > ThreadCritSec) ;
return ret;
}
void RemoveBufferFromThread( SOCKET_OBJ * sock, BUFFER_OBJ_EX * buf)
{
EnterCriticalSection( & buf- > Thread- > ThreadCritSec) ;
// Remove buffer from the list
RemoveDoubleList( & buf- > Thread- > BufferList, & buf- > bufDList) ;
// Decrement the event count for the thread
buf- > Thread- > EventCount- - ;
// Set the thread's event
WSASetEvent( buf- > Thread- > Event) ;
LeaveCriticalSection( & buf- > Thread- > ThreadCritSec) ;
}
THREAD_OBJ * GetThreadObj( ) {
THREAD_OBJ * thread = NULL ;
thread = ( THREAD_OBJ * ) HeapAlloc( GetProcessHeap( ) , HEAP_ZERO_MEMORY, sizeof ( THREAD_OBJ) ) ;
if ( thread = = NULL ) {
fprintf ( stderr , "GetThreadObj:HeapAlloc failed./n" ) ;
ExitProcess( - 1) ;
}
thread- > Event = WSACreateEvent( ) ;
if ( thread- > Event = = NULL ) {
fprintf ( stderr , "GetThreadObj: WSACreateEvent failed./n" ) ;
ExitProcess( - 1) ;
}
thread- > Handles[ 0] = thread- > Event;
thread- > EventCount = 1;
InitializeDoubleHead( & thread- > BufferList) ;
InitializeCriticalSection( & thread- > ThreadCritSec) ;
return thread;
}
void RenumberEvents( THREAD_OBJ * thread) {
EnterCriticalSection( & thread- > ThreadCritSec) ;
BUFFER_OBJ_EX * obj = NULL ;
int i = 0;
BufferObj * sptr = NULL ;
sptr = ( BufferObj * ) GotoNextDoubleList( & ( thread- > BufferList) , & ( thread- > BufferList. head) ) ;
thread- > EventCount = 1;
while ( sptr) {
obj = ( BUFFER_OBJ_EX * ) container_of( BUFFER_OBJ_EX, bufDList, sptr) ;
thread- > Handles[ thread- > EventCount+ + ] = obj- > ol. hEvent;
sptr = ( BufferObj * ) GotoNextDoubleList( & ( thread- > BufferList) , sptr) ;
}
LeaveCriticalSection( & thread- > ThreadCritSec) ;
}
int PostRecv( BUFFER_OBJ_EX * recvobj) {
WSABUF wbuf;
DWORD bytes,
flags;
int rc= NO_ERROR;
EnterCriticalSection( & recvobj- > Socket - > SockCritSec) ;
recvobj- > operation = OP_READ;
wbuf. buf = recvobj- > buf;
wbuf. len = recvobj- > buflen;
flags = 0;
if ( gProtocol = = IPPROTO_TCP ) {
rc = WSARecv( recvobj- > Socket - > s, & wbuf, 1, & bytes, & flags, & recvobj- > ol, NULL ) ;
}
else {
ExitProcess( - 1) ;
}
if ( rc = = SOCKET_ERROR)
{
rc = NO_ERROR;
if ( WSAGetLastError( ) ! = WSA_IO_PENDING)
{
fprintf ( stderr , "PostRecv: WSARecv* failed: %d/n" , WSAGetLastError( ) ) ;
rc = SOCKET_ERROR;
}
}
// Increment outstanding overlapped operations
InterlockedIncrement( & recvobj- > Socket - > OutstandingOps) ;
LeaveCriticalSection( & recvobj- > Socket - > SockCritSec) ;
return NO_ERROR;
}
int PostSend( BUFFER_OBJ_EX * sendobj) {
WSABUF wbuf;
DWORD bytes;
int rc;
rc = NO_ERROR;
sendobj- > operation = OP_WRITE;
wbuf. buf = sendobj- > buf;
wbuf. len = sendobj- > buflen;
EnterCriticalSection( & sendobj- > Socket - > SockCritSec) ;
if ( gProtocol = = IPPROTO_TCP ) {
rc = WSASend( sendobj- > Socket - > s, & wbuf, 1, & bytes, 0, & sendobj- > ol, NULL ) ;
}
else {
ExitProcess( - 1) ;
}
if ( rc = = SOCKET_ERROR)
{
rc = NO_ERROR;
if ( WSAGetLastError( ) ! = WSA_IO_PENDING)
{
fprintf ( stderr , "PostSend: WSASend* failed: %d/n" , WSAGetLastError( ) ) ;
rc = SOCKET_ERROR;
}
}
// Increment the outstanding operation count
InterlockedIncrement( & sendobj- > Socket - > OutstandingOps) ;
LeaveCriticalSection( & sendobj- > Socket - > SockCritSec) ;
return rc;
}
int PostAccept( BUFFER_OBJ_EX * acceptobj) {
DWORD bytes;
int rc = NO_ERROR;
acceptobj- > operation = OP_ACCEPT;
EnterCriticalSection( & acceptobj- > Socket - > SockCritSec) ;
acceptobj- > sclient = socket ( acceptobj- > Socket - > af, SOCK_STREAM , IPPROTO_TCP ) ;
if ( acceptobj- > sclient = = INVALID_SOCKET) {
fprintf ( stderr , "PostAccept: create socket failed./n" ) ;
return - 1;
}
rc = acceptobj- > Socket - > lpfnAcceptEx( acceptobj- > Socket - > s, acceptobj- > sclient, acceptobj- > buf,
acceptobj- > buflen - ( ( sizeof ( SOCKADDR_STORAGE) + 16) * 2) , sizeof ( SOCKADDR_STORAGE) + 16, sizeof ( SOCKADDR_STORAGE) + 16,
& bytes, & acceptobj- > ol) ;
if ( rc = = FALSE ) {
if ( WSAGetLastError( ) ! = WSA_IO_PENDING)
{
fprintf ( stderr , "PostAccept: AcceptEx failed: %d/n" , WSAGetLastError( ) ) ;
ExitProcess( - 1) ;
}
}
InterlockedIncrement( & acceptobj- > Socket - > OutstandingOps) ;
LeaveCriticalSection( & acceptobj- > Socket - > SockCritSec) ;
return rc;
}
void HandleIo( BUFFER_OBJ_EX * buf) {
SOCKET_OBJ * sock= NULL ,
* clientobj= NULL ; // New client object for accepted connections
BUFFER_OBJ_EX * recvobj= NULL , // Used to post new receives on accepted connections
* sendobj= NULL ; // Used to post sends for data received
DWORD bytes,
flags;
BOOL bFreeSocketObj;
int error ,
rc;
sock = buf- > Socket ;
error = NO_ERROR;
bFreeSocketObj = FALSE ;
InterlockedDecrement( & sock- > OutstandingOps) ;
rc = WSAGetOverlappedResult( sock- > s, & buf- > ol, & bytes, FALSE , & flags) ;
if ( rc = = FALSE ) {
fprintf ( stderr , "HandleIo: WSAGetOverlappedResult failed./n" ) ;
ExitProcess( - 1) ;
}
if ( buf- > operation = = OP_ACCEPT) {
SOCKADDR_STORAGE * LocalSockaddr= NULL ,
* RemoteSockaddr= NULL ;
int LocalSockaddrLen,
RemoteSockaddrLen;
sock- > lpfnGetAcceptExSockaddrs( buf- > buf, buf- > buflen - ( ( sizeof ( SOCKADDR_STORAGE) + 16) * 2) ,
sizeof ( SOCKADDR_STORAGE) + 16, sizeof ( SOCKADDR_STORAGE) + 16,
( SOCKADDR * * ) & LocalSockaddr, & LocalSockaddrLen,
( SOCKADDR * * ) & RemoteSockaddr, & RemoteSockaddrLen) ;
clientobj = GetSocketObj( buf- > sclient, buf- > Socket - > af) ;
sendobj = GetBufferObjEx( clientobj, gBufferSize) ;
sendobj- > buflen = bytes;
memcpy ( sendobj- > buf, buf- > buf, bytes) ;
AssignIoToThread( sendobj) ;
if ( PostSend( sendobj) ! = NO_ERROR) {
RemoveBufferFromThread( clientobj, sendobj) ;
FreeBufferObjEx( sendobj) ;
closesocket( clientobj- > s) ;
clientobj- > s = INVALID_SOCKET;
FreeSocketObj( clientobj) ;
}
PostAccept( buf) ;
} else if ( ( buf- > operation = = OP_READ) & & ( error = = NO_ERROR) ) {
if ( ( bytes > 0) | | ( gProtocol = = IPPROTO_UDP ) )
{
// Create a buffer to send
sendobj = buf;
sendobj- > buflen = bytes;
// Initiate the send
if ( PostSend( sendobj) ! = NO_ERROR)
{
// In the event of an error, clean up the socket object
RemoveBufferFromThread( sock, sendobj) ;
FreeBufferObjEx( sendobj) ;
closesocket( sock- > s) ;
sock- > s = INVALID_SOCKET;
bFreeSocketObj = TRUE ;
}
}
else
{
// Graceful close
sock- > bClosing = TRUE ;
// Free the completed operation
RemoveBufferFromThread( sock, buf) ;
FreeBufferObjEx( buf) ;
// Check to see if there are more outstanding operations. If so, wait
// for them to complete; otherwise, clean up the socket object.
EnterCriticalSection( & sock- > SockCritSec) ;
if ( sock- > OutstandingOps = = 0)
{
closesocket( sock- > s) ;
bFreeSocketObj = TRUE ;
}
LeaveCriticalSection( & sock- > SockCritSec) ;
}
} else if ( buf- > operation = = OP_WRITE) {
EnterCriticalSection( & sock- > SockCritSec) ;
if ( sock- > bClosing & & ( sock- > OutstandingOps = = 0) )
{
RemoveBufferFromThread( sock, buf) ;
closesocket( sock- > s) ;
FreeBufferObjEx( buf) ;
bFreeSocketObj = TRUE ;
}
else
{
buf- > buflen = gBufferSize;
// Free the send op that just completed
if ( PostRecv( buf) ! = NO_ERROR)
{
RemoveBufferFromThread( sock, buf) ;
FreeBufferObjEx( buf) ;
}
}
LeaveCriticalSection( & sock- > SockCritSec) ;
}
}
DWORD WINAPI IoThread( LPVOID lpParam) {
THREAD_OBJ * thread= NULL ;
int index,
count ,
rc,
i;
thread = ( THREAD_OBJ * ) lpParam;
RenumberEvents( thread) ;
while ( true ) {
rc = WaitForMultipleObjects( thread- > EventCount, thread- > Handles, FALSE , INFINITE) ;
if ( rc = = WAIT_FAILED | | rc = = WAIT_TIMEOUT) {
if ( GetLastError( ) = = ERROR_INVALID_HANDLE)
{
RenumberEvents( thread) ;
continue ;
}
else
{
fprintf ( stderr , "IoThread: WaitForMultipleObjects failed: %d/n" ,
GetLastError( ) ) ;
break ;
}
}
count = thread- > EventCount;
for ( i = 0; i < count ; + + i) {
rc = WaitForSingleObject( thread- > Handles[ i] , 0) ;
if ( rc = = WAIT_TIMEOUT)
continue ;
index = i;
WSAResetEvent( thread- > Handles[ index] ) ;
if ( index = = 0) {
RenumberEvents( thread) ;
break ;
} else {
HandleIo( FindBufferObjEx( thread, thread- > Handles[ index] ) ) ;
}
}
}
ExitThread( 0) ;
return 0;
}
void AssignIoToThread( BUFFER_OBJ_EX * buf) {
ThreadObj * threadObj;
THREAD_OBJ * thread;
EnterCriticalSection( & gThreadListCritSec) ;
threadObj = ( ThreadObj * ) GotoNextSingleList( & threadobjHeader, threadobjHeader. head) ;
while ( threadObj) {
thread = ( THREAD_OBJ * ) container_of( THREAD_OBJ, next, threadObj) ;
if ( InsertBufferObjExToThread( thread, buf) = = NO_ERROR) {
break ;
}
threadObj = ( ThreadObj * ) GotoNextSingleList( & threadobjHeader, threadObj) ;
}
if ( threadObj = = NULL ) {
thread = GetThreadObj( ) ;
thread- > Thread = CreateThread( NULL , 0, IoThread, ( LPVOID) thread, 0, NULL ) ;
if ( thread- > Thread = = NULL ) {
fprintf ( stderr , "AssignIoToThread: CreateThread failed./n" ) ;
ExitProcess( - 1) ;
}
InsertBufferObjExToThread( thread, buf) ;
EnqueueSingleListHead( & threadobjHeader, & ( thread- > next) ) ;
}
buf- > Thread = thread;
WSASetEvent( thread- > Event) ;
LeaveCriticalSection( & gThreadListCritSec) ;
}
int _tmain( int argc, _TCHAR* argv[ ] )
{
WSADATA wsd;
THREAD_OBJ * thread= NULL ;
SOCKET_OBJ * sockobj= NULL ;
SocketObjHeader ListenSockets;
int endpointcount= 0,
interval = 0,
rc,
i;
struct addrinfo * res= NULL ,
* ptr= NULL ;
if ( WSAStartup( MAKEWORD( 2, 2) , & wsd) ! = 0)
{
fprintf ( stderr , "unable to load Winsock!/n" ) ;
return - 1;
}
InitializeCriticalSection( & gThreadListCritSec) ;
InitializeSingleHead( & ListenSockets) ;
InitializeSingleHead( & threadobjHeader) ;
res = ResolveAddress( gSrvAddr, gPort, gAddressFamily, gSocketType, gProtocol) ;
if ( res = = NULL )
{
fprintf ( stderr , "ResolveAddress failed to return any addresses!/n" ) ;
return - 1;
}
ptr = res;
while ( ptr) {
sockobj = GetSocketObj( INVALID_SOCKET, ptr- > ai_family) ;
sockobj- > s = socket ( ptr- > ai_family, ptr- > ai_socktype, ptr- > ai_protocol) ;
if ( sockobj- > s = = INVALID_SOCKET)
{
fprintf ( stderr , "socket failed: %d/n" , WSAGetLastError( ) ) ;
return - 1;
}
rc = bind ( sockobj- > s, ptr- > ai_addr, ptr- > ai_addrlen) ;
if ( rc = = SOCKET_ERROR)
{
fprintf ( stderr , "bind failed: %d/n" , WSAGetLastError( ) ) ;
return - 1;
}
if ( gProtocol = = IPPROTO_TCP ) {
BUFFER_OBJ_EX * acceptobj = NULL ;
GUID guidAcceptEx = WSAID_ACCEPTEX,
guidGetAcceptExSockaddrs = WSAID_GETACCEPTEXSOCKADDRS;
DWORD bytes;
rc = WSAIoctl( sockobj- > s, SIO_GET_EXTENSION_FUNCTION_POINTER, & guidAcceptEx, sizeof ( guidAcceptEx) ,
& sockobj- > lpfnAcceptEx, sizeof ( sockobj- > lpfnAcceptEx) , & bytes, NULL , NULL ) ;
if ( rc = = SOCKET_ERROR)
{
fprintf ( stderr , "WSAIoctl: SIO_GET_EXTENSION_FUNCTION_POINTER failed: %d/n" ,
WSAGetLastError( ) ) ;
return - 1;
}
rc = WSAIoctl( sockobj- > s, SIO_GET_EXTENSION_FUNCTION_POINTER, & guidGetAcceptExSockaddrs, sizeof ( guidGetAcceptExSockaddrs) ,
& sockobj- > lpfnGetAcceptExSockaddrs, sizeof ( sockobj- > lpfnGetAcceptExSockaddrs) , & bytes, NULL , NULL ) ;
if ( rc = = SOCKET_ERROR)
{
fprintf ( stderr , "WSAIoctl: SIO_GET_EXTENSION_FUNCTION_POINTER failed: %d/n" ,
WSAGetLastError( ) ) ;
return - 1;
}
rc = listen ( sockobj- > s, 200) ;
if ( rc = = SOCKET_ERROR)
{
fprintf ( stderr , "listen failed: %d/n" , WSAGetLastError( ) ) ;
return - 1;
}
sockobj- > PendingAccepts = ( BUFFER_OBJ_EX * * ) HeapAlloc( GetProcessHeap( ) , HEAP_ZERO_MEMORY, ( sizeof ( BUFFER_OBJ * ) * gOverlappedCount) ) ;
if ( sockobj- > PendingAccepts = = NULL )
{
fprintf ( stderr , "PendingAccepts HeapAlloc failed: %d/n" , GetLastError( ) ) ;
ExitProcess( - 1) ;
}
for ( i = 0; i < gOverlappedCount; + + i) {
sockobj- > PendingAccepts[ i] = acceptobj = GetBufferObjEx( sockobj, gBufferSize) ;
AssignIoToThread( acceptobj) ;
if ( PostAccept( acceptobj) ! = NO_ERROR) {
ExitProcess( - 1) ;
}
}
EnqueueSingleList( & ListenSockets, & ( sockobj- > next) ) ;
}
ptr = ptr- > ai_next;
}
freeaddrinfo ( res) ;
while ( true ) {
Sleep ( 5000) ;
interval+ + ;
if ( interval = = 12) {
SocketObj * listenptr= NULL ;
int optval,
optlen;
// Walk the list of outstanding accepts
listenptr = ( SocketObj * ) GotoNextSingleList( & ListenSockets, ListenSockets. head) ;
while ( listenptr)
{
sockobj = ( SOCKET_OBJ * ) container_of( SOCKET_OBJ, next, listenptr) ;
for ( i= 0; i < gOverlappedCount ; i+ + )
{
optlen = sizeof ( optval) ;
rc = getsockopt (
sockobj- > PendingAccepts[ i] - > sclient,
SOL_SOCKET,
SO_CONNECT_TIME,
( char * ) & optval,
& optlen
) ;
if ( rc = = SOCKET_ERROR)
{
fprintf ( stderr , "getsockopt: SO_CONNECT_TIME failed: %d/n" , WSAGetLastError( ) ) ;
return - 1;
}
if ( ( optval ! = 0xFFFFFFFF) & & ( optval > 300) )
{
closesocket( sockobj- > PendingAccepts[ i] - > sclient) ;
}
}
listenptr = ( SocketObj * ) GotoNextSingleList( & ListenSockets, listenptr) ;
}
interval = 0;
}
}
WSACleanup( ) ;
return 0;
}

Windows Socket I/O模型之 重叠I/O事件通知模式

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