int
main(int argc, char **argv)
{
int listenfd, listenfd2, connfd, udpfd, nready, maxfdp1;
char mesg[MAXLINE];
pid_t childpid;
fd_set rset;
ssize_t n;
socklen_t len;
const int on = 1;
struct sockaddr_in cliaddr, servaddr;
void sig_chld(int);
/* create listening TCP socket : fingerprint packet recv */
listenfd = Socket(AF_INET, SOCK_STREAM, 0);
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(SERV_PORT+1);
Setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
Bind(listenfd, (SA *) &servaddr, sizeof(servaddr));
Listen(listenfd, LISTENQ);
/* create listening TCP socket : other packet */
listenfd2 = Socket(AF_INET, SOCK_STREAM, 0);
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(SERV_PORT);
Setsockopt(listenfd2, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
Bind(listenfd2, (SA *) &servaddr, sizeof(servaddr));
Listen(listenfd2, LISTENQ);
Signal(SIGCHLD, sig_chld); /* must call waitpid() */
FD_ZERO(&rset);
maxfdp1 = max(listenfd, listenfd2) + 1;
for ( ; ; ) {
FD_SET(listenfd, &rset);
FD_SET(listenfd2, &rset);
if ( (nready = select(maxfdp1, &rset, NULL, NULL, NULL)) < 0) {
if (errno == EINTR)
continue; /* back to for() */
else
err_sys("select error");
}
if (FD_ISSET(listenfd, &rset)) {
len = sizeof(cliaddr);
connfd = Accept(listenfd, (SA *) &cliaddr, &len);
if ( (childpid = Fork()) == 0) { /* child process */
Close(listenfd); /* close listening socket */
recv_fp(connfd); /* process the request : fp packet */
exit(0);
}
Close(connfd); /* parent closes connected socket */
}
if (FD_ISSET(listenfd2, &rset)) {
len = sizeof(cliaddr);
connfd = Accept(listenfd2, (SA *) &cliaddr, &len);
if ( (childpid = Fork()) == 0) { /* child process */
Close(listenfd2); /* close listening socket */
recv_chunk(connfd); /* process the request */
exit(0);
}
Close(connfd); /* parent closes connected socket */
}
}
}
int main(int argc, char **argv)
{
int listenfd, connfd, udpfd, nready, maxfdp1;
char mesg[MAXLINE];
pid_t childpid;
fd_set rset;
ssize_t n;
socklen_t len;
const int on =1;
struct sockaddr_in cliaddr, servaddr;
void sig_chld(int); //信号处理函数，防止产生僵尸进程
//创建TCP套接字
listenfd = Socket(AF_INET, SOCK_STREAM, 0);
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(SERV_PORT);
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
//允许TCP端口上可以绑定多个地址
Setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
Bind(listenfd, (struct sockaddr*) &servaddr, sizeof(servaddr));
Listen(listenfd, LISTENQ);
//创建UDP套接字
udpfd = Socket(AF_INET, SOCK_DGRAM, 0);
//经测试，此处绑定UDP时也可以直接使用上面TCP的地址值，但是一旦端口号或者IP地址变了之后还得重新加上
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(SERV_PORT); //TCP与UDP端口独立，不存在重复
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
Bind(udpfd, (struct sockaddr*)&servaddr, sizeof(servaddr));
Signal(SIGCHLD, sig_chld); //避免出现僵尸进程，在子进程退出后调用waitpid
FD_ZERO(&rset);
maxfdp1 = max(listenfd, udpfd) + 1;
for(; ;)
{
FD_SET(listenfd, &rset);
FD_SET(udpfd, &rset);
if((nready = select(maxfdp1, &rset, NULL, NULL, NULL)) < 0)
{
if(errno == EINTR)
continue; //被信号中断重新调用select
else
err_sys("select error");
}
if(FD_ISSET(listenfd, &rset))
{
//TCP套接字建立新的连接
len = sizeof(cliaddr);
connfd = Accept(listenfd, (struct sockaddr*)&cliaddr, &len);
if((childpid = Fork()) == 0)
{
//子进程
Close(listenfd);
str_echo(connfd);
exit(0);
}
Close(connfd);
}
if(FD_ISSET(udpfd, &rset))
{
//UDP套接字的连接
len = sizeof(cliaddr);
n = Recvfrom(udpfd, mesg, MAXLINE, 0, (struct sockaddr*)&cliaddr, &len);
Sendto(udpfd, mesg, n, 0, (struct sockaddr*)&cliaddr, len);
}
}
return 0;
}
int main()
{
int Listenfd,connfd;
socklen_t clilen;
struct sockaddr_in cliaddr, servaddr;
int val,len,i,last_in = 0,last_out = 0;
struct tcp_info_user info;
char writebuf[MAX_PKT_SIZE];
Listenfd = Socket(AF_INET,SOCK_STREAM,0);
memset(&servaddr,0,sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(SERV_PORT);
Bind(Listenfd,(SA*)&servaddr,sizeof(servaddr));
Listen(Listenfd,LISTENQ);
for( ; ;){
clilen = sizeof(cliaddr);
connfd = Accept(Listenfd,(SA*)&cliaddr,&clilen);
sleep(3);
val = 1;
len = sizeof(int);
Setsockopt(connfd, SOL_TCP, TCP_NODELAY,(void *)&val, len);
snprintf(writebuf,TRANSSIZE,"world01");
Write(connfd,writebuf,strlen(writebuf)+1);
sleep_ms(20);
snprintf(writebuf,TRANSSIZE,"world02");
Write(connfd,writebuf,strlen(writebuf)+1);
sleep_ms(20);
snprintf(writebuf,TRANSSIZE,"world03");
Write(connfd,writebuf,strlen(writebuf)+1);
sleep_ms(10);
snprintf(writebuf,TRANSSIZE,"world04");
Write(connfd,writebuf,strlen(writebuf)+1);
sleep_ms(10);
snprintf(writebuf,TRANSSIZE,"world05");
Write(connfd,writebuf,strlen(writebuf)+1);;
i = 0;
while(i < 100*200)
{
len = sizeof(info);
Getsockopt(connfd, SOL_TCP, TCP_INFO,(void *)&info, (socklen_t *)&len);
if( (last_in != info.tcpi_segs_in) || (last_out != info.tcpi_segs_out) )
{
sleep_ms(1);
len = sizeof(info);
Getsockopt(connfd, SOL_TCP, TCP_INFO,(void *)&info, (socklen_t *)&len);
printftcpinfo(&info);
printf("i=%d\n",i);
last_in = info.tcpi_segs_in;
last_out = info.tcpi_segs_out;
}
sleep_ms(10);
i++;
}
sleep(200);
printf("close\n");
Close(connfd);
}
return 0;
}