客户端代码
#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<arpa/inet.h>
#include<string.h>
#include<unistd.h>
#include<sys/select.h>
#include<netinet/in.h>
#define MSG_ERR(msg) do{fprintf(stderr,"_%d_",__LINE__);perror(msg);return -1;}while(0)
#define PORT 8888
#define IP "192.168.31.21"
int main()
{
int sfd = socket(AF_INET,SOCK_STREAM,0);
if(sfd < 0)
{
MSG_ERR("socket");
}
int reuse = 1;
if(setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse)) < 0)
{
MSG_ERR("setsockopt");
}
struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(PORT);
sin.sin_addr.s_addr = inet_addr(IP);
if(connect(sfd,(struct sockaddr*)&sin,sizeof(sin)) < 0)
{
MSG_ERR("connect");
}
printf("connect success\n");
fd_set readfds,tempfds;
FD_ZERO(&readfds);
FD_ZERO(&tempfds);
FD_SET(0,&readfds);
FD_SET(sfd,&readfds);
char buf[128] = "";
int maxfd = sfd;
int select_res = 0;
int i = 0;
int res = 0;
while(1)
{
tempfds = readfds;
select_res = select(maxfd+1,&tempfds,NULL,NULL,NULL);
if(select_res < 0)
{
MSG_ERR("select");
}
else if(0 == select_res)
{
fprintf(stderr,"select time out\n");
break;
}
if(FD_ISSET(0,&tempfds))
{
bzero(buf,sizeof(buf));
fgets(buf,sizeof(buf),stdin);
buf[strlen(buf)-1] = 0;
if(send(sfd,buf,sizeof(buf),0) < 0)
{
MSG_ERR("send");
}
printf("send message success\n");
}
if(FD_ISSET(sfd,&tempfds))
{
bzero(buf,sizeof(buf));
res = recv(sfd,buf,sizeof(buf),0);
if(res < 0)
{
MSG_ERR("recv");
}
else if(res == 0)
{
printf("server is off_line\n");
break;
}
printf("%d : %s\n",sfd,buf);
}
}
close(sfd);
return 0;
}
服务器代码
#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<arpa/inet.h>
#include<string.h>
#include<unistd.h>
#include<sys/select.h>
#include<netinet/in.h>
#define MSG_ERR(msg) do{fprintf(stderr,"_%d_",__LINE__);perror(msg);return -1;}while(0)
#define PORT 8888
#define IP "192.168.31.21"
int update_maxfd(int maxfd,fd_set readfds);
int main()
{
int sfd = socket(AF_INET,SOCK_STREAM,0);
if(sfd < 0)
{
MSG_ERR("socket");
}
int reuse = 1;
if(setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse)) < 0)
{
MSG_ERR("setsockopt");
}
struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(PORT);
sin.sin_addr.s_addr = inet_addr(IP);
if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin)) < 0)
{
MSG_ERR("bind");
}
printf("bind success\n");
if(listen(sfd,10) < 0)
{
MSG_ERR("listen");
}
printf("listen success\n");
struct sockaddr_in cin;
socklen_t addrlen = sizeof(cin);
fd_set readfds,tempfds;
FD_ZERO(&readfds);
FD_ZERO(&tempfds);
FD_SET(0,&readfds);
FD_SET(sfd,&readfds);
int maxfd = sfd;
int select_res = 0;
char buf[128] = "";
int newfd = -1;
int i = 0;
ssize_t res = 0;
struct sockaddr_in save_addr[1024-4];
while(1)
{
tempfds = readfds;
struct timeval tm;
tm.tv_sec = 5;
tm.tv_usec = 0;
select_res = select(maxfd+1,&tempfds,NULL,NULL,&tm);
if(select_res < 0)
{
MSG_ERR("select");
}
else if(0 == select_res)
{
fprintf(stderr,"select time out\n");
break;
}
for(i=0;i<=maxfd;i++)
{
if(FD_ISSET(i,&tempfds) == 0)
{
continue;
}
if(0 == i)
{
printf("click enter\n");
fflush(stdout);
bzero(buf,sizeof(buf));
int sendfd;
int res = scanf("%d %s",&sendfd,buf);
while(getchar() != 10);
if(res != 2)
{
fprintf(stderr,"enter the correct content\n");
continue;
}
if(FD_ISSET(sendfd,&readfds) == 0)
{
fprintf(stderr,"sendfd=%d fd not in the clooection\n",sendfd);
continue;
}
if(send(sendfd,buf,sizeof(buf),0) < 0)
{
MSG_ERR("send");
return -1;
}
printf("send message success\n");
}
else if(sfd == i)
{
printf("click client\n");
fflush(stdout);
newfd = accept(sfd,(struct sockaddr*)&cin,&addrlen);
if(newfd < 0)
{
MSG_ERR("accept");
}
printf("[%s : %d] newfd = %d\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd);
save_addr[newfd-4] = cin;
FD_SET(newfd,&readfds);
maxfd = maxfd>newfd?maxfd:newfd;
}
else
{
bzero(buf,sizeof(buf));
res = recv(i,buf,sizeof(buf),0);
if(res < 0)
{
MSG_ERR("recv");
}
else if(0 == res)
{
printf("[%s : %d] newfd = %d client off-line\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),i);
close(i);
FD_CLR(i,&readfds);
maxfd = update_maxfd(maxfd,readfds);
}
else
{
printf("[%s : %d] newfd = %d : %s\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),i,buf);
}
}
}
}
}
int update_maxfd(int maxfd,fd_set readfds)
{
int i = maxfd;
for( ;i>0;i--)
{
if(FD_ISSET(i,&readfds))
{
return i;
}
}
return 0;
}
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