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//socket
socket_listen_fd = Socket(AF_INET, SOCK_STREAM, 0);
bzero(&server_addr,sizeof(struct sockaddr_in));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port = 0;
//listen a random port
Listen(socket_listen_fd, 20);//
//set for select read
maxfd = socket_listen_fd;
maxi = -1;
for(i = 0; i<FD_SETSIZE; i++)
{
client[i] = -1;
}
FD_ZERO(&allset);
FD_SET(socket_listen_fd, &allset);
while (1)
{
rset = allset;
nready = select(maxfd+1, &rset, NULL, NULL, NULL);
if(nready == -1)
{
perr_exit("select err");
}
//new client connection
if(FD_ISSET(socket_listen_fd, &rset))
{
connfd = Accept(socket_listen_fd, (struct sockaddr *)&client_addr, &client_addrlen);
//find an unused
for(i = 0; i < FD_SETSIZE; i++)
{
if(client[i] < 0)
{
client[i] = connfd;
break;
}
}
if(i == FD_SETSIZE)
{
perr_exit("too many clients");
}
//add new client's decriptor to set
FD_SET(connfd, &allset);
//max used file descriptor
if(connfd > maxfd)
maxfd = connfd;
//client index
if(i > maxi)
maxi = i;
//no more readable fd
if(--nready == 0)
continue;
}
//check all clients for data
for(client_index = 0; client_index <= maxi; client_index++)
{
if((sockfd = client[client_index]) == socket_listen_fd)
continue;
if(FD_ISSET(sockfd, &rset))
{
if((n = Read(sockfd, buf_in, MAXLINE)) == 0)
{
//connection closed by client
Close(sockfd);
FD_CLR(sockfd, &allset);
client[client_index] = -1;
}
else if(n == -1)
{
printf("Read err\n");
}
else
{
process_client();
}
//no more readable fd
if(--nready == 0)
break;
}
}
}
while (1)
{
FD_ZERO(&rset);
FD_SET(socket_listen_fd, &rset);
for(i = 0; i <= maxi; i++)
{
if(client[i])
{
FD_SET(client[i], &rset);
}
}
//new client connection
if(FD_ISSET(socket_listen_fd, &rset))
{
connfd = Accept(socket_listen_fd, (struct sockaddr *)&client_addr, &client_addrlen);
printf("client connected~~~~~~~~~~~~~~~~~~~~~~~\n");
//check all clients for data
for(client_index = 0; client_index <= maxi; client_index++)
{
printf("fd1 changing***************\n");
if((sockfd = client[client_index])<0)
//if((sockfd = client[client_index]) == socket_listen_fd)
continue;
if(FD_ISSET(sockfd, &rset))
{
printf("fd2 changing***************\n");