socket服务器端一个问题

亚细亚 2009-07-15 09:34:26
下面的代码是服务器端的一个socket代码,编译提示没有定义fork();我查了一下资料,fork()是unix系统的一个函数。我现在在windows测试,请问在windows下,这个应该怎么修改?谢谢!

void startSocket()
{
WSADATA wsaData;
int recvbytes;
int sockfd,client_fd;
struct sockaddr_in my_server;
struct sockaddr_in remote_addr;
unsigned char buf[MAXDATASIZE];
WSAStartup(MAKEWORD(2,0),&wsaData);
sockfd=socket(AF_INET,SOCK_STREAM,0);
if(sockfd<0)
{
ShowError();
}
my_server.sin_family=AF_INET;
my_server.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
my_server.sin_port=htons(5000);//htons(5000);
if (bind(sockfd, (struct sockaddr *)&my_server, sizeof(struct sockaddr)) == -1) {
ShowError();
}
if (listen(sockfd, BACKLOG) == -1) {
ShowError();
}
while(1) {
int sin_size = sizeof(struct sockaddr_in);
if ((client_fd = accept(sockfd, (struct sockaddr *)&remote_addr, &sin_size)) == -1) {
perror("accept Error");
continue;
}
printf("received a connection from %s\n", inet_ntoa(remote_addr.sin_addr)); //inet_ntoa(将网络二进制的数字转换成网络地址)
if (!fork()) {
unsigned char *msg="abc";
if ((recvbytes=recv(client_fd, buf, MAXDATASIZE, 0)) ==-1) {
perror("recv Error!");
exit(1);
}
buf[recvbytes] = '\0';
printf("Received: %s\n",buf);
//给客户端发送数据
if (send(client_fd, msg,strlen(msg), 0) == -1) {
perror("send Error");
/* 这个通讯已经结束 */
close(client_fd);
exit(0);
}
}

}
}

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NKLoveRene 2009-07-15
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fork是linux函数,开启一个子进程
windows上没有子进程,所以用多线程一样的
fork出来的子进程相当于windows上的一个线程 了
亚细亚 2009-07-15
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9楼赞一个,大家还有其它的方法,可以发表自己的看法。
亚细亚 2009-07-15
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这一块还要好好琢磨琢磨。
jamesjinyongming 2009-07-15
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BOOL CreateSocketInformation(SOCKET s);
void FreeSocketInformation(DWORD Index);
void SendData(LPSOCKET_INFORMATION SocketInfo,int i);
DWORD TotalSockets = 0;
LPSOCKET_INFORMATION SocketArray[FD_SETSIZE];



void main(void)
{
SOCKET ListenSocket;
SOCKET AcceptSocket;
SOCKADDR_IN InternetAddr;
WSADATA wsaData;
INT Ret;
FD_SET WriteSet;
FD_SET ReadSet;
DWORD i;
DWORD Total;
ULONG NonBlock;
DWORD Flags;
DWORD RecvBytes;


if ((Ret = WSAStartup(0x0202,&wsaData)) != 0)
{
printf("WSAStartup() failed with error %d\n", Ret);
WSACleanup();
return;
}

// Prepare a socket to listen for connections.

if ((ListenSocket = WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0,
WSA_FLAG_OVERLAPPED)) == INVALID_SOCKET)
{
printf("WSASocket() failed with error %d\n", WSAGetLastError());
return;
}

InternetAddr.sin_family = AF_INET;
InternetAddr.sin_addr.s_addr = htonl(INADDR_ANY);
InternetAddr.sin_port = htons(PORT);

if (bind(ListenSocket, (PSOCKADDR) &InternetAddr, sizeof(InternetAddr))
== SOCKET_ERROR)
{
printf("bind() failed with error %d\n", WSAGetLastError());
return;
}

if (listen(ListenSocket, 5))
{
printf("listen() failed with error %d\n", WSAGetLastError());
return;
}

// Change the socket mode on the listening socket from blocking to
// non-block so the application will not block waiting for requests.

NonBlock = 1;
if (ioctlsocket(ListenSocket, FIONBIO, &NonBlock) == SOCKET_ERROR)
{
printf("ioctlsocket() failed with error %d\n", WSAGetLastError());
return;
}

while(TRUE)
{
// Prepare the Read and Write socket sets for network I/O notification.
FD_ZERO(&ReadSet);
FD_ZERO(&WriteSet);

// Always look for connection attempts.

FD_SET(ListenSocket, &ReadSet);

// Set Read and Write notification for each socket based on the
// current state the buffer. If there is data remaining in the
// buffer then set the Write set otherwise the Read set.

for (i = 0; i < TotalSockets; i++)
FD_SET(SocketArray[i]->Socket, &ReadSet);

if ((Total = select(0, &ReadSet, NULL, NULL, NULL)) == SOCKET_ERROR)
{
printf("select() returned with error %d\n", WSAGetLastError());
return;
}

// Check for arriving connections on the listening socket.
if (FD_ISSET(ListenSocket, &ReadSet))
{
Total--;
if ((AcceptSocket = accept(ListenSocket, NULL, NULL)) != INVALID_SOCKET)
{

// Set the accepted socket to non-blocking mode so the server will
// not get caught in a blocked condition on WSASends

NonBlock = 1;
if (ioctlsocket(AcceptSocket, FIONBIO, &NonBlock) == SOCKET_ERROR)
{
printf("ioctlsocket() failed with error %d\n", WSAGetLastError());
return;
}

if (CreateSocketInformation(AcceptSocket) == FALSE)
return;

}
else
{
if (WSAGetLastError() != WSAEWOULDBLOCK)
{
printf("accept() failed with error %d\n", WSAGetLastError());
return;
}
}
}

// Check each socket for Read and Write notification until the number
// of sockets in Total is satisfied.

for (i = 0; Total > 0 && i < TotalSockets; i++)
{
LPSOCKET_INFORMATION SocketInfo = SocketArray[i];

// If the ReadSet is marked for this socket then this means data
// is available to be read on the socket.

if (FD_ISSET(SocketInfo->Socket, &ReadSet))
{
Total--;

SocketInfo->DataBuf.buf = SocketInfo->Buffer;
SocketInfo->DataBuf.len = DATA_BUFSIZE;

Flags = 0;
if (WSARecv(SocketInfo->Socket, &(SocketInfo->DataBuf), 1, &RecvBytes,
&Flags, NULL, NULL) == SOCKET_ERROR)
{
if (WSAGetLastError() != WSAEWOULDBLOCK)
{
printf("WSARecv() failed with error %d\n", WSAGetLastError());

FreeSocketInformation(i);
}

continue;
}
else
{
SocketInfo->BytesRECV = RecvBytes;
SocketInfo->DataBuf.len = RecvBytes;

//处理接收数据

// If zero bytes are received, this indicates the peer closed the
// connection.
if (RecvBytes == 0)
{
FreeSocketInformation(i);
continue;
}
}
}


}
}
}

BOOL CreateSocketInformation(SOCKET s)
{
LPSOCKET_INFORMATION SI;

printf("Accepted socket number %d\n", s);

if ((SI = (LPSOCKET_INFORMATION) GlobalAlloc(GPTR,
sizeof(SOCKET_INFORMATION))) == NULL)
{
printf("GlobalAlloc() failed with error %d\n", GetLastError());
return FALSE;
}

// Prepare SocketInfo structure for use.

SI->Socket = s;
SI->BytesSEND = 0;
SI->BytesRECV = 0;

SocketArray[TotalSockets] = SI;

TotalSockets++;

return(TRUE);
}

void FreeSocketInformation(DWORD Index)
{
LPSOCKET_INFORMATION SI = SocketArray[Index];
DWORD i;

closesocket(SI->Socket);

printf("Closing socket number %d\n", SI->Socket);

GlobalFree(SI);

// Squash the socket array

for (i = Index; i < TotalSockets; i++)
{
SocketArray[i] = SocketArray[i + 1];
}

TotalSockets--;
}


void SendData(LPSOCKET_INFORMATION SocketInfo,int i)
{
DWORD SendBytes;
if (WSASend(SocketInfo->Socket, &(SocketInfo->DataBuf), 1, &SendBytes, 0,
NULL, NULL) == SOCKET_ERROR)
{
if (WSAGetLastError() != WSAEWOULDBLOCK)
{
printf("WSASend() failed with error %d\n", WSAGetLastError());

FreeSocketInformation(i);
}


}
}


lemirymoo 2009-07-15
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CreateThread不是很好用,很容易出现发出创建新线程命令,但新线程还未真正地创建时再次发生请求,这时候新的调用会覆盖参数导致前一个CreateThread工作失败。

我说的的确有点表达不清楚,不过不要紧,你用CreateThread做一下就知道了,如果遇到问题了再考虑我说的情况就好。下面是一个程序片段,解决了我说的问题。



SOCKET rb[2000]; //滞留请求支持。
unsigned int rp = 0;
/** 监听 **/
while(running){
fdmain.fd_count = 1;
select(1,&fdmain,NULL,NULL,&_zt);
if(!FD_ISSET(sock, &fdmain)){
continue;
}

if(threadcount > THREAD_LIMIT){
continue;
}
rp++;
if(rp>1999){
rp = 0;
}
rb[rp] = accept(sock,(SOCKADDR*)&socket_addr,NULL);
//WaitForSingleObject(CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)thread_request,&rb[rp],0,&threadid),5000);
CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)thread_request,&rb[rp],0,&threadid);
if(threadcount == THREAD_LIMIT){
printf("警告:当前线程数己达到限制数目%d.\n",THREAD_LIMIT);
}
}
kondykuang 2009-07-15
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creatprocess()可以··
网上应该很多wondows的程序 找找看··
mengjfu 2009-07-15
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可以在cygwin下测试fork函数,它模拟Linux环境。很好的东东
亚细亚 2009-07-15
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[Quote=引用 2 楼 mengjfu 的回复:]
在window下没有一个函数可以实现UNIX下的fork()函数,其原因是历史造成的.对于UNIX来说它一出生就是多用户的系统,所以它的所有进程都共有一个最原始的父进程init.而windows生下来时是个单用户系统(DOS),不存在这样的概念.所以fork这个函数是UNIX下特有的.

如果硬要模似,在window下CreateProcess()略有相似之处.

楼主可以用cygwin模拟Linux,很好用的
[/Quote]
我现在不一定硬要模拟,如果有其他方法也行,关键是不知道如何用其他方法实现,还请大侠给予帮助,谢谢!
Nio96 2009-07-15
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createthread?
亚细亚 2009-07-15
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[Quote=引用 1 楼 codecola 的回复:]
windows下,建议使用线程
[/Quote]
能否具体说说,先谢谢!
mengjfu 2009-07-15
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在window下没有一个函数可以实现UNIX下的fork()函数,其原因是历史造成的.对于UNIX来说它一出生就是多用户的系统,所以它的所有进程都共有一个最原始的父进程init.而windows生下来时是个单用户系统(DOS),不存在这样的概念.所以fork这个函数是UNIX下特有的.

如果硬要模似,在window下CreateProcess()略有相似之处.

楼主可以用cygwin模拟Linux,很好用的
codecola 2009-07-15
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windows下,建议使用线程

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