int main(int argc, char **argv)
{
int sockfd, rcvbuf, mss;
socklen_t len;
struct sockaddr_in servaddr;
if (argc != 2)
err_quit("usage: rcvbuf <IPaddrress>");
sockfd = Socket(AF_INET, SOCK_STREAM, 0);
len = sizeof(rcvbuf);
Getsockopt(sockfd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, &len);
len = sizeof(mss);
Getsockopt(sockfd, IPPROTO_TCP, TCP_MAXSEG, &mss, &len);
printf("defaults: SO_RCVBUF = %d, MSS = %d\n", rcvbuf, mss);
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(13);
Inet_pton(AF_INET, argv[1], &servaddr.sin_addr);
Connect(sockfd, (SA *)&servaddr, sizeof(servaddr));
len = sizeof(rcvbuf);
Getsockopt(sockfd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, &len);
len = sizeof(mss);
Getsockopt(sockfd, IPPROTO_TCP, TCP_MAXSEG, &mss, &len);
printf("alter connect: SO_RCVBUF = %d, MSS = %d\n", rcvbuf, mss);
exit(0);
}
/* show snd/rcv buffer sizes for sockfd */
static void show_buff_szs(int sockfd, const char *type)
{
int sz;
socklen_t len;
sz = 0;
len = (socklen_t)sizeof(int);
Getsockopt(sockfd, SOL_SOCKET, SO_RCVBUF, &sz, &len);
printf("%s socket receive buffer: %d\n", type, sz);
Getsockopt(sockfd, SOL_SOCKET, SO_SNDBUF, &sz, &len);
printf("%s socket send buffer: %d\n", type, sz);
}
void *get_info(void *arg)
{
int sockfd;
int len,i=0,last_in = 0,last_out = 0;;
struct tcp_info_user info;
FILE *stream = fopen("rst_server","w+");
//接收线程detach自己
pthread_detach(pthread_self());
sockfd = *( (int*)arg );
i = 0;
while(i < 100*200000 && openflag>0)
{
len = sizeof(info);
errno = 0;
Getsockopt(sockfd, SOL_TCP, TCP_INFO,(void *)&info, (socklen_t *)&len);
if(errno != 0)
{
//perror("get sock error\n");
break;
}
if( (last_in != info.tcpi_segs_in) || (last_out != info.tcpi_segs_out) )
{
sleep_ms(1);
len = sizeof(info);
Getsockopt(sockfd, SOL_TCP, TCP_INFO,(void *)&info, (socklen_t *)&len);
fprintftcpinfo(stream,&info);
//printf("i=%d\n",i);
last_in = info.tcpi_segs_in;
last_out = info.tcpi_segs_out;
i++;
continue;
}
sleep_ms(1);
i++;
}
fclose(stream);
return 0;
}
void
dg_echo(int sockfd, SA *pcliaddr, socklen_t clilen)
{
int n;
socklen_t len;
char mesg[MAXLINE];
Signal(SIGINT, recvfrom_int);
len = sizeof(n);
Getsockopt(sockfd, SOL_SOCKET, SO_RCVBUF, &n, &len);
if(len == sizeof(n))
printf("initial SO_RCVBUF size: %d\n", n);
else
printf("Error getting SO_RCVBUF size.\n");
n = 220 * 1024;
/* Set the socket recvbuf size. By default*/
/* it's 87380. */
Setsockopt(sockfd, SOL_SOCKET, SO_RCVBUF, &n, sizeof(n));
printf("Set new SO_RCVBUF: %d\n", n);
for ( ; ; ) {
len = clilen;
Recvfrom(sockfd, mesg, MAXLINE, 0, pcliaddr, &len);
count++;
}
}
void *recv_function(void *arg)
{
int sockfd,len,i=0;
struct tcp_info_user info;
char buffer[MAX_PKT_SIZE] = {"welcome to linux hello\0"}; //MAX_PKT_SIZE
//接收线程detach自己
pthread_detach(pthread_self());
sockfd = *( (int*)arg );
//sleep_ms(15*1000);
len = sizeof(info);
Getsockopt(sockfd, SOL_TCP, TCP_INFO,(void *)&info, (socklen_t *)&len);
printf("----------------start read--------------\n");
printftcpinfo(&info);
while(i < 200)
{
Read(sockfd,buffer,MAX_PKT_SIZE);
//sleep_ms(2*1000);
//len = sizeof(info);
//Getsockopt(sockfd, SOL_TCP, TCP_INFO,(void *)&info, (socklen_t *)&len);
//printf("\n----------read %d bytes--------------\n",(i+1)*num);
//printftcpinfo(&info);
i++;
}
return 0;
}
/* use nonblock for connect */
int connect_nob(int sockfd, const struct sockaddr *servaddr, socklen_t addrlen, int nsec)
{
int flags, n, error;
socklen_t len;
struct timeval tval;
fd_set rset, wset;
flags = Fcntl(sockfd, F_GETFL, 0);
Fcntl(sockfd, F_SETFL, flags | O_NONBLOCK);
error = 0;
/* when socket is nonblock connect return EINPROGRESS and three ways hand shake is still running */
if ((n = connect(sockfd, servaddr, addrlen)) < 0)
{
if (errno != EINPROGRESS) /* ignore the mistake */
return (-1);
} /* nonbalck state the socket is connected now */
/* this might happen some times */
if (n == 0)
goto done;
FD_ZERO(&rset);
FD_SET(sockfd, &rset);
wset = rset;
tval.tv_sec = nsec;
tval.tv_usec = 0;
if ((n = select(sockfd+1, &rset, &wset, NULL, nsec ? &tval : NULL)) < 0)
err_sys("select error");
else if (n == 0) /* select time out */
{
Close(sockfd);
errno = ETIMEDOUT;
err_sys("select timeout");
}
if (FD_ISSET(sockfd, &rset) || FD_ISSET(sockfd, &wset))
{
len = sizeof(error);
Getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &error, &len);
}
else
err_quit("select error: sockfd not set");
done: /* wether n==0 or not bellow will excuted */
Fcntl(sockfd, F_SETFL, flags); /* set back to block */
if (error) /* connect error */
{
Close(sockfd);
errno = error;
return (-1);
}
return (0);
}
int main(int argc, char **argv)
{
int sockfd, n;
char recvline[MAXLINE + 1];
struct sockaddr_in servaddr;
int rcv_sz, mss_sz;
socklen_t len;
if (argc != 2)
err_quit("usage: a.out <IPaddress>");
len = sizeof(int);
rcv_sz = mss_sz = 0;
if ( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
err_sys("socket error");
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(13); /* daytime server */
if (inet_pton(AF_INET, argv[1], &servaddr.sin_addr) <= 0)
err_quit("inet_pton error for %s", argv[1]);
Getsockopt(sockfd, SOL_SOCKET, SO_RCVBUF, &rcv_sz, &len);
Getsockopt(sockfd, IPPROTO_TCP, TCP_MAXSEG, &mss_sz, &len);
printf("RCVBUF: %d MSS: %d\n", rcv_sz, mss_sz);
if (connect(sockfd, (SA *) &servaddr, sizeof(servaddr)) < 0)
err_sys("connect error");
Getsockopt(sockfd, SOL_SOCKET, SO_RCVBUF, &rcv_sz, &len);
Getsockopt(sockfd, IPPROTO_TCP, TCP_MAXSEG, &mss_sz, &len);
printf("RCVBUF: %d MSS: %d\n", rcv_sz, mss_sz);
while ( (n = read(sockfd, recvline, MAXLINE)) > 0) {
recvline[n] = 0; /* null terminate */
if (fputs(recvline, stdout) == EOF)
err_sys("fputs error");
}
if (n < 0)
err_sys("read error");
exit(0);
}
static int
handle_kqueue_error(const struct pollfd_state *state){
socklen_t slen;
int err;
slen = sizeof(err);
if(Getsockopt(state->pfd.fd,SOL_SOCKET,SO_ERROR,&err,&slen)){
return -1;
}
pmoan(err,"Socket error on %d\n",state->pfd.fd);
return 0;
}
int
main(int argc, char **argv)
{
int listenfd, connfd;
u_char *opts;
pid_t childpid;
socklen_t clilen, len;
struct sockaddr_in cliaddr, servaddr;
void sig_chld(int);
opts = Malloc(44);
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);
Bind(listenfd, (SA *) &servaddr, sizeof(servaddr));
Listen(listenfd, LISTENQ);
Signal(SIGCHLD, sig_chld);
for ( ; ; )
{
clilen = sizeof(cliaddr);
if ( (connfd = accept(listenfd, (SA *) &cliaddr, &clilen)) < 0)
{
if (errno == EINTR)
continue; /* back to for() */
else
err_sys("accept error");
}
len = 44;
Getsockopt(connfd, IPPROTO_IP, IP_OPTIONS, opts, &len);
if (len > 0)
{
printf("received IP options, len = %d\n", len);
inet_srcrt_print(opts, len);
}
if ( (childpid = Fork()) == 0) /* child process */
{
Close(listenfd); /* close listening socket */
str_echo(connfd); /* process the request */
exit(0);
}
Close(connfd); /* parent closes connected socket */
}
}
void *get_info(void *arg)
{
int sockfd;
int len,i=0,last_in = 0,last_out = 0;;
struct tcp_info_user info;
//接收线程detach自己
pthread_detach(pthread_self());
sockfd = *( (int*)arg );
i = 0;
while(i < 100*200000)
{
len = sizeof(info);
Getsockopt(sockfd, 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(sockfd, 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(1);
i++;
}
return 0;
}
int
main(int argc, char **argv)
{
int sockfd, mss, sendbuff;
socklen_t optlen;
sockfd = Socket(AF_INET, SOCK_STREAM, 0);
/* Fetch and print the TCP maximum segment size. */
optlen = sizeof(mss);
Getsockopt(sockfd, IPPROTO_TCP, TCP_MAXSEG, &mss, &optlen);
printf("TCP mss = %d\n", mss);
/* Set the send buffer size, then fetch it and print its value. */
sendbuff = 65536;
Setsockopt(sockfd, SOL_SOCKET, SO_SNDBUF, &sendbuff, sizeof(sendbuff));
optlen = sizeof(sendbuff);
Getsockopt(sockfd, SOL_SOCKET, SO_SNDBUF, &sendbuff, &optlen);
printf("send buffer size = %d\n", sendbuff);
exit(0);
}
int
sctp_get_no_strms(int sock_fd,struct sockaddr *to, socklen_t tolen)
{
int retsz;
struct sctp_status status;
retsz = sizeof(status);
bzero(&status,sizeof(status));
status.sstat_assoc_id = sctp_address_to_associd(sock_fd,to,tolen);
Getsockopt(sock_fd,IPPROTO_SCTP, SCTP_STATUS,
&status, &retsz);
return(status.sstat_outstrms);
}
int main()
{
int Listenfd,connfd;
int len,val;
int last_in = 0,last_out = 0,i = 0;
struct tcp_info_user info;
socklen_t clilen;
struct sockaddr_in cliaddr, servaddr;
char writebuf[TRANSSIZE];
snprintf(writebuf,TRANSSIZE,"hello");
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(10);
snprintf(writebuf,TRANSSIZE,"world02");
Write(connfd,writebuf,strlen(writebuf)+1);
sleep_ms(10);
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(2);
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);
len = sizeof(info);
Getsockopt(connfd, SOL_TCP, TCP_INFO,(void *)&info, (socklen_t *)&len);
printftcpinfo(&info);
printf("close\n");
Close(connfd);
}
return 0;
}