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发布时间：2006-06-28 03:36     点击：

close(mainsock);

return(-3);

}

if (listen(mainsock, 5) == -1) { /* 将主动套接字变为被动套接字，准备好接收连接 */

close(mainsock);

return(-4);

}

/* Set this socket as a Non-blocking socket. */

if (ioctl(mainsock, FIONBIO, &flag) == -1) {

close(mainsock);

return(-5);

}

Mysock.DaemonSock = mainsock;

FD_SET(mainsock, &Mysock.readfds); /* 申明对主套接字"可读"感兴趣 */

FD_SET(mainsock, &Mysock.exceptfds); /* 申明对主套接字上例外事件感兴趣 */

return(1); 

}

void CloseMainSock()

/* 关闭主套接字，并清除对它上面事件的申明。在程序结束前关闭主套接字是一个好习惯 */

{

close(Mysock.DaemonSock);

FD_CLR(Mysock.DaemonSock, &Mysock.readfds);

FD_CLR(Mysock.DaemonSock, &Mysock.exceptfds);

}

int CreateConnection(struct in_addr *sin_addr)

/* Create a Connection to remote host which IP address is in sin_addr. 

Param: sin_addr indicates the IP address in Network Byte Order. 

if succeed return the socket number which indicates this connection,

else return error code (<0) */

{

struct sockaddr_in server; /* server address */

int tmpsock, flag=1, i;

if ((tmpsock = socket(AF_INET, SOCK_STREAM, 0)) < 0)

return(-1);

server.sin_family = AF_INET;

server.sin_port = Mysock.Port;

server.sin_addr.s_addr = sin_addr->s_addr;

/* Set this socket as a Non-blocking socket. */

if (ioctl(tmpsock, FIONBIO, &flag) == -1) {

close(tmpsock);

return(-2);

}

/* Connect to the server. */

if (connect(tmpsock, (struct sockaddr *)&server, sizeof(server)) < 0) {

if ((errno != EWOULDBLOCK) && (errno != EINPROGRESS)) {

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