select的TCP服务器模型
服务器端
#include
#include
#include
#include
#include
#include
#include
#define PORT 6666
#define IP "192.168.122.120"
int main(int argc, const char *argv[])
{
int sfd = socket(AF_INET,SOCK_STREAM,0);
if(sfd < 0)
{
ERRO_MES("socket");
return -1;
}
printf("sfd = %d\n",sfd);
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)
{
ERRO_MES("bind");
return -1;
}
printf("bind success\n");
if(listen(sfd,10) < 0)
{
ERRO_MES("listen");
return -1;
}
printf("listen success\n");
int reuse = 1;
if(setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0)
{
ERRO_MES("setsockopt");
return -1;
}
printf("允许端口快速重用成功\n");
struct sockaddr_in cin;
socklen_t addrlen = sizeof(cin);
struct sockaddr_in saveCin[1024-3];
fd_set readfds,tempfds;
FD_ZERO(&readfds);
FD_ZERO(&tempfds);
FD_SET(sfd,&readfds);
FD_SET(0,&readfds);
int maxfd = sfd;
int s_res = -1;
char buf[128]="";
ssize_t res = 0;
int newfd = -1;
while(1)
{
tempfds = readfds;
s_res = select(maxfd+1, &tempfds, NULL, NULL, NULL);
if(s_res < 0)
{
ERRO_MES("select");
return -1;
}
else if(0 == s_res)
{
printf("超时操作\n");
break;
}
for(int i=0; i<=maxfd; i++)
{
if(FD_ISSET(i, &tempfds) == 0)
continue;
if(0 == i)
{
printf("触发键盘输入事件\n");
fgets(buf,sizeof(buf),stdin);
buf[strlen(buf)-1] = 0;
printf(": %s\n",buf);
}
else if(sfd == i)
{
printf("触发客户端连接事件\n");
newfd = accept(sfd,(struct sockaddr*)&cin,&addrlen);
if(newfd < 0)
{
ERRO_MES("accept");
return -1;
}
printf("[%s : %d] newfd = %d,客户端链接成功\n",\
inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd);
saveCin[newfd-3] = cin;
FD_SET(newfd, &readfds);
maxfd = newfd>sfd ? newfd : sfd;
}
else
{
printf("触发客户端交互事件\n");
bzero(buf,sizeof(buf));
res = recv(i,buf,sizeof(buf),0);
if(res < 0)
{
ERRO_MES("recv");
return -1;
}
else if(0 == res)
{
printf("[%s : %d] newfd = %d,客户下线\n",\
inet_ntoa(saveCin[i-3].sin_addr),ntohs(saveCin[i-3].sin_port),i);
close(i);
FD_CLR(i,&readfds);
while(FD_ISSET(maxfd,&readfds) == 0 && maxfd-- >=0);
continue;
}
printf("[%s : %d] newfd :%d\t buf = %s\n"\
,inet_ntoa(saveCin[i-3].sin_addr),ntohs(saveCin[i-3].sin_port),i,buf);
strcat(buf,"----");
if(send(newfd,buf,sizeof(buf),0) < 0)
{
ERRO_MES("send");
return -1;
}
printf("send success\n");
}
}
}
close(sfd);
close(newfd);
return 0;
}
客户端
#include
#include
#include
#include
#include
#include
#include
#define PORT 6666
#define IP "192.168.122.120"
int main(int argc, const char *argv[])
{
int cfd = socket(AF_INET,SOCK_STREAM,0);
if(cfd < 0)
{
ERRO_MES("socket");
return -1;
}
printf("cfd = %d\n",cfd);
struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(PORT);
sin.sin_addr.s_addr = inet_addr(IP);
if(connect(cfd,(struct sockaddr*)&sin,sizeof(sin)) < 0)
{
ERRO_MES("connect");
return -1;
}
printf("连接成功\n");
fd_set readfds,tempfds;
FD_ZERO(&readfds);
FD_ZERO(&tempfds);
FD_SET(0,&readfds);
FD_SET(cfd,&readfds);
char buf[128]="";
ssize_t res = 0;
int s_res = -1;
int maxfd = cfd;
while(1)
{
tempfds = readfds;
s_res = select(maxfd+1,&tempfds,NULL,NULL,NULL);
if(s_res < 0)
{
ERRO_MES("select");
return -1;
}
else if(0 == s_res)
{
printf("time out...\n");
break;
}
if(FD_ISSET(0,&tempfds))
{
printf("触发键盘输入事件\n");
bzero(buf,sizeof(buf));
fgets(buf,sizeof(buf),stdin);
buf[strlen(buf)-1] = 0;
printf(": %s\n",buf);
if(send(cfd,buf,sizeof(buf),0) < 0)
{
ERRO_MES("send");
return -1;
}
printf("send success\n");
}
if(FD_ISSET(cfd,&tempfds))
{
printf("触发服务器交互事件\n");
bzero(buf,sizeof(buf));
res = recv(cfd,buf,sizeof(buf),0);
if(res < 0)
{
ERRO_MES("recv");
return -1;
}
else if(0 == res)
{
printf("[%s : %d] cfd = %d,客户下线\n",IP,PORT,cfd);
break;
}
printf("[%s : %d] cfd :%d\t buf = %s\n",IP,PORT,cfd,buf);
}
}
close(cfd);
return 0;
}
poll客户端
#include
#include
#include
#include
#include
#include
#include
#define PORT 6666
#define IP "192.168.122.120"
int main(int argc, const char *argv[])
{
int cfd = socket(AF_INET,SOCK_STREAM,0);
if(cfd < 0)
{
ERRO_MES("socket");
return -1;
}
printf("cfd = %d\n",cfd);
struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(PORT);
sin.sin_addr.s_addr = inet_addr(IP);
if(connect(cfd,(struct sockaddr*)&sin,sizeof(sin)) < 0)
{
ERRO_MES("connect");
return -1;
}
printf("connect success\n");
struct pollfd fds[2];
fds[0].fd = 0;
fds[0].events = POLLIN;
fds[1].fd = cfd;
fds[1].events = POLLIN;
char buf[128] = "";
ssize_t res = 0;
int p_res = -1;
while(1)
{
p_res = poll(fds,2,-1);
if(p_res < 0)
{
ERRO_MES("poll");
return -1;
}
else if(0 == p_res)
{
printf("time out...\n");
break;
}
if((fds[0].revents & POLLIN) != 0)
{
printf("触发键盘输入事件\n");
bzero(buf,sizeof(buf));
fgets(buf,sizeof(buf),stdin);
buf[strlen(buf)-1] = 0;
if(send(cfd, buf,sizeof(buf),0) < 0)
{
ERRO_MES("send");
return -1;
}
printf("send success\n");
}
if(fds[1].revents & POLLIN)
{
printf("触发服务器交互事件\n");
bzero(buf,sizeof(buf));
res = recv(cfd,buf,sizeof(buf),0);
if(res < 0)
{
ERRO_MES("recv");
return -1;
}
else if(0 == res)
{
printf("[%s : %d] cfd= %d 服务器掉线\n",IP,PORT,cfd);
break;
}
printf("[%s : %d] cfd= %d : %s\n",IP,PORT,cfd,buf);
}
}
close(cfd);
return 0;
}