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tcpechotimesrv.c
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tcpechotimesrv.c
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#include "unp.h"
#include "unpthread.h"
#include <time.h>
//deal with the SIG_PIPE signal-------------------------------------------------------------
void sig_pipe(int signo){
printf("***Client termination: EPIPE error detected***\n");
return;
}
//time thread method-------------------------------------------------------------------------
static void time_s(int sockfd){
int maxfdp1, sfd;
time_t ticks;
ssize_t nread;
char buff[MAXLINE], recvline[MAXLINE];
fd_set rset;
struct timeval timeout;
FD_ZERO(&rset);
//initial report the time
ticks = time (NULL);
snprintf(buff, sizeof(buff), "%.24s\r\n", ctime(&ticks) ) ;
if(write(sockfd, buff, strlen(buff)) < 0)
perror("time_s: write fails...");
//loop to report time every 5 sec
while(1){
FD_SET(sockfd, &rset);
timeout.tv_sec = 5;
timeout.tv_usec = 0;
if((sfd = select(sockfd+1, &rset, NULL, NULL, &timeout)) < 0){
perror("time_s: select error...");
break;
}
if(sfd == 0){
ticks = time (NULL);
snprintf(buff, sizeof(buff), "%.24s\r\n", ctime(&ticks) ) ;
if(write(sockfd, buff, strlen(buff)) < 0){
perror("time_s: write error...");
break;
}
}
if(FD_ISSET(sockfd, &rset)){
if((nread = read(sockfd, recvline, MAXLINE)) == 0){
printf("***Client termination: socket read returned with value 0***\n");
printf("***[DAYTIME] service connection terminates***\n");
break;
}
else if(nread < 0 && errno == EINTR)
continue;
else if(nread < 0)
err_sys("time_s: read error");
}
}
}
//-------------------------------------------------------------------------------------------
//time thread pointer------------------------------------------------------------------------
static void *time_serv(void *arg){
int connfd;
signal(SIGPIPE, sig_pipe);
connfd = *((int *)arg);
free(arg);
pthread_detach(pthread_self());
time_s(connfd);
close (connfd);
return(NULL);
}
//echo thread method-------------------------------------------------------------------------
static void echo_s(int sockfd){
ssize_t nread;
char recvline[MAXLINE];
//loop to echo
while(1){
if((nread = readline(sockfd, recvline, MAXLINE)) == 0){
printf("***Client termination: socket read returned with value 0***\n");
printf("***[ECHO] service connection terminates***\n");
break;
}
else if(nread > 0)
if(writen(sockfd, recvline, nread) <= 0)
perror("echo_s: write failed");
else if(nread < 0 && errno == EINTR){
perror("Client termination: socket read returned with value -1, errno = EINTR");
continue;
}
else if(nread < 0)
err_sys("echo_s: readline error");
}
}
//-------------------------------------------------------------------------------------------
//echo thread pointer------------------------------------------------------------------------
static void *echo_serv(void *arg){
int connfd;
signal(SIGPIPE, sig_pipe);
connfd = *((int *)arg);
free(arg);
pthread_detach(pthread_self());
echo_s(connfd);
close (connfd);
return(NULL);
}
//-------------------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------------
int main(int argc, char **argv)
{
int listenecho, listentime, *iptr_time, *iptr_echo, maxfdp1;
pthread_t tid;
socklen_t addrlen, len;
fd_set rset;
struct sockaddr *cliaddr;
const int on = 1;
//since the server of well-known ports needs to run in root permission, so here I use the self-defined ports
listentime = tcp_listen(NULL, "9500", &addrlen);
listenecho = tcp_listen(NULL, "9501", &addrlen);
//set up the socket option
if(setsockopt(listentime, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
perror("setsockopt error...");
if(setsockopt(listenecho, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
perror("setsockopt error...");
cliaddr = malloc(addrlen);
FD_ZERO(&rset);
while(1){
len = addrlen;
FD_SET(listentime, &rset);
FD_SET(listenecho, &rset);
maxfdp1 = max(listentime, listenecho) + 1;
select(maxfdp1, &rset, NULL, NULL, NULL);
iptr_time = malloc(sizeof(int));
iptr_echo = malloc(sizeof(int));
//deal with the daytime application-----------------------------------------------------------
if(FD_ISSET(listentime, &rset)){
if((*iptr_time = accept (listentime, cliaddr, &len)) < 0){
perror("main: accept error...");
continue;
}
else{
printf("connection from %s provided service of [DAYTIME]\n", sock_ntop (cliaddr, len) );
pthread_create(&tid, NULL, &time_serv, iptr_time);
continue;
}
}
//deal with the echo application--------------------------------------------------------------
if(FD_ISSET(listenecho, &rset)){
if((*iptr_echo = accept (listenecho, cliaddr, &len)) < 0){
perror("main: accept error...");
continue;
}
else{
printf("connection from %s provided service of [ECHO]\n", sock_ntop (cliaddr, len) );
pthread_create(&tid, NULL, &echo_serv, iptr_echo);
continue;
}
}
}
}