int recv_thd::qt_metacall(QMetaObject::Call _c, int _id, void **_a)
{
_id = QThread::qt_metacall(_c, _id, _a);
if (_id < 0)
return _id;
if (_c == QMetaObject::InvokeMetaMethod) {
switch (_id) {
case 0: recv_msg_signal((*reinterpret_cast< QString(*)>(_a[1]))); break;
case 1: err_msg_signal((*reinterpret_cast< QString(*)>(_a[1]))); break;
}
_id -= 2;
}
return _id;
}
int main(void)
{
int sock_fd, new_fd; // listen on sock_fd, new connection on new_fd
struct sockaddr_in server_addr; // server address information
struct sockaddr_in client_addr; // connector's address information
socklen_t sin_size;
int yes = 1;
char buf[BUF_SIZE];
int ret;
int i;
if ((sock_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
}
if (setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) {
perror("setsockopt");
exit(1);
}
server_addr.sin_family = AF_INET; // host byte order
server_addr.sin_port = htons(MYPORT); // short, network byte order
server_addr.sin_addr.s_addr = INADDR_ANY; // automatically fill with my IP
memset(server_addr.sin_zero, '\0', sizeof(server_addr.sin_zero));
if (bind(sock_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) {
perror("bind");
exit(1);
}
if (listen(sock_fd, BACKLOG) == -1) {
perror("listen");
exit(1);
}
printf("listen port %d\n", MYPORT);
fd_set fdsr;
int maxsock;
struct timeval tv;
conn_amount = 0;
sin_size = sizeof(client_addr);
maxsock = sock_fd;
while (1)
{
FD_ZERO(&fdsr); //每次进入循环都重建描述符集
FD_SET(Listen_socket, &fdsr);
for (i = 0; i < MAXCLIENT; i++) //将存在的套接字加入描述符集
{
if (fd[i] != 0)
{
FD_SET(fd[i], &fdsr);
if(flag_minutechange == 1)
{
con_time[i]--;
if(con_time[i] <= 0)
{
close(fd[i]);
FD_CLR(fd[i], &fdsr);
fd[i] = 0;
conn_amount--;
}
}
}
}
flag_minutechange = 0;
tv.tv_sec = 1;
tv.tv_usec = 0;
ret = select(maxsock + 1, &fdsr, NULL, NULL,&tv); //关键的select()函数，用来探测各套接字的异常
//如果在文件描述符集中有连接请求或发送请求，会作相应处理，
//从而成功的解决了单线程情况下阻塞进程的情况，实现多用户连接与通信
if (ret < 0) //<0表示探测失败
{
qDebug()<<"failed select\n";
break;
}
else if (ret == 0) //=0表示超时，下一轮循环
{
//qDebug()<<"timeout\n";
continue;
}
// 如果select发现有异常，循环判断各活跃连接是否有数据到来
for (i = 0; i < conn_amount; i++)
{
if (FD_ISSET(fd[i], &fdsr))
{
ret = recv(fd[i], msg, BUF_SIZE, 0);
if (ret <= 0) // recv<=0,表明客户端关闭连接，服务器也关闭相应连接，并把连接套接子从文件描述符集中清除
{
qDebug("client[%d] close\n", i);
close(fd[i]);
FD_CLR(fd[i], &fdsr);
fd[i] = 0;
conn_amount--;
}
else //否则表明客户端有数据发送过来，作相应接受处理
{
con_time[i] = MAX_IDLECONNCTIME; //重新写入fd[i]的超时数，再此之后如果MAX_IDLECONNCTIME分钟内此连接无反应，服务器会关闭该连接
if (ret < BUF_SIZE)
emit err_msg_signal("client ip: " + QString::fromLatin1(inet_ntoa(client_addr.sin_addr)) +
" port: " + QString::number(ntohs(client_addr.sin_port))+" coming data");
qDebug("client[%d] send:%s\n", i, msg);
msg[ret] = '\0';
emit recv_msg_signal(QString::fromLatin1(msg),fd[i]);
//send(fd[i],msg,ret,0);
}
}
}
// 以下说明异常有来自客户端的连接请求
if (FD_ISSET(Listen_socket, &fdsr))
{
new_fd = accept(Listen_socket, (struct sockaddr *)&client_addr, &addr_size);
if (new_fd <= 0)
{
qDebug("failed accept");
continue;
}
// 判断活跃连接数时候是否小于最大连接数，如果是，添加新连接到文件描述符集中
if (conn_amount < MAXCLIENT)
{
for(i = 0;i < MAXCLIENT;i++)
{
if(fd[i] == 0)
{
fd[i] = new_fd;
con_time[i] = MAX_IDLECONNCTIME; //每次新建立连接，设置该连接的超时数，如果此连接此后MAX_IDLECONNCTIME分钟内无反应，关闭该连接
break;
}
}
conn_amount++;
//fd[conn_amount++] = new_fd;
qDebug("new connection client[%d] %s:%d\n", conn_amount,
inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
emit err_msg_signal("client ip: " + QString::fromLatin1(inet_ntoa(client_addr.sin_addr)) +
" port: " + QString::number(ntohs(client_addr.sin_port)));
if (new_fd > maxsock)
maxsock = new_fd;
}
else
{
qDebug("MAXCLIENT arrive, exit\n");
send(new_fd, "over MAXCLIENT\n", 25, 0);
close(new_fd);
continue;
}
}
}
exit(0);
}