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server.c
166 lines (153 loc) · 3.82 KB
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server.c
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/* server.c */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/time.h>
#include "common.h"
int main(void)
{
struct sockaddr_in servaddr, cliaddr;
struct timeval tv, start;
socklen_t cliaddr_len;
int listenfd, new_fd;
char buf[MAXLINE], buf_client[MAXLINE];
int i, j, n, x, on,ret;
fd_set clientfd;
int maxsock, timeuse[FDCOUNT];
/* ===========socket============== */
listenfd = Socket(AF_INET, SOCK_STREAM, 0);
/* ==========允许地址立即使用======== */
on = 1;
setsockopt( listenfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(SERV_PORT);
/* ==============bind============= */
Bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
/* ============listen============= */
Listen(listenfd, 20);
printf("~~~listen connections:\n");
int conn_amount = 0;
int fd_a[FDCOUNT];
maxsock = listenfd;
for(i=0;i<FDCOUNT;i++) {
gettimeofday(&start, NULL);
fd_a[i] = -1;
timeuse[i] = start.tv_sec;
}
while(1) {
FD_ZERO(&clientfd);
FD_SET(listenfd, &clientfd);
tv.tv_sec = TIME_SEC;
tv.tv_usec = TIME_USEC;
for(i=0;i<FDCOUNT;i++) {
if(fd_a[i] != -1)
FD_SET(fd_a[i], &clientfd);
}
cliaddr_len = sizeof(cliaddr);
ret = select(maxsock+1, &clientfd, NULL, NULL, &tv);
/* check timeout */
for(i=0;i<FDCOUNT;i++) {
gettimeofday(&start, NULL);
timeuse[i] = start.tv_sec - timeuse[i];
if(fd_a[i] !=-1 && timeuse[i] > TIME_SEC) {
printf("***Client Timeout, id = %d\n", fd_a[i]);
close(fd_a[i]);
FD_CLR(fd_a[i], &clientfd);
fd_a[i] = -1;
timeuse[i] = 0;
}
}
if(ret<0) {
perror("select:");
break;
}
else if(ret == 0) {
for(i=0;i<FDCOUNT;i++) {
if(fd_a[i] != -1) {
printf("***Timeout, connection canceled, id = %d***\n", fd_a[i]);
close(fd_a[i]);
FD_CLR(fd_a[i], &clientfd);
fd_a[i] = -1;
}
}
conn_amount = 0;
continue;
}
else if(FD_ISSET(listenfd, &clientfd)){
new_fd=Accept(listenfd,(struct sockaddr*)&cliaddr, cliaddr_len) ;
if(new_fd>0) {
for(i=0;i<FDCOUNT;i++) {
if(fd_a[i] != -1)
continue;
gettimeofday(&start, NULL); /* Record the time when connect. */
timeuse[i] = start.tv_sec;
fd_a[i] = new_fd;
break;
}
if(conn_amount<FDCOUNT) {
FD_SET(new_fd, &clientfd);
printf("new connection client %d\n", new_fd);
if(new_fd>maxsock)
maxsock = new_fd;
conn_amount++;
}
else {
printf("***max connections arrive, disconnect***\n");
close(new_fd);
continue;
}
}
}
else {
for(i=0;i<FDCOUNT;i++) {
if(fd_a[i] == -1)
continue;
if(!FD_ISSET(fd_a[i], &clientfd))
continue;
memset(buf, 0, MAXLINE);
n = read(fd_a[i], buf, MAXLINE);
if(n<=0 || !strcmp(buf, EXIT_MSG)) {
printf("client exit.id = %d\n", fd_a[i]);
close(fd_a[i]);
FD_CLR(fd_a[i], &clientfd);
fd_a[i] = -1;
conn_amount--;
continue;
}
printf("\n---message from client---%d\n%s\n", fd_a[i], buf);
gettimeofday(&start, NULL); /* get active time for client */
timeuse[i] = start.tv_sec - timeuse[i];
/*
if(timeuse[i] > TIME_SEC) {
printf("***Client Timeout, id = %d\n", fd_a[i]);
close(fd_a[i]);
FD_CLR(fd_a[i], &clientfd);
fd_a[i] = -1;
timeuse[i] = 0;
break;
}
else
timeuse[i] = start.tv_sec;
*/
x = strlen(buf);
memset(buf_client, 0, MAXLINE);
for (j = 0; x>=0; x--, j++)
buf_client[j] = buf[x];
if((write(fd_a[i], buf_client, n)) == -1) {
perror("write_1:");
exit(1);
}
memset(buf, 0, MAXLINE);
memset(buf_client, 0, MAXLINE);
}
}
}
close(listenfd);
exit(0);
}