思维导图
使用IO多路复用实现并发
select实现TCP服务器端
#include <myhead.h>
#define SER_IP "192.168.125.112"
#define SER_PORT 8888
int main(int argc, const char *argv[])
{
int sfd=socket(AF_INET,SOCK_STREAM,0);
if(sfd == -1)
{
perror("socket error");
return -1;
}
struct sockaddr_in sin;
sin.sin_family=AF_INET;
sin.sin_addr.s_addr=inet_addr(SER_IP);
sin.sin_port=htons(SER_PORT);
if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin)) == -1)
{
perror("bind error");
return -1;
}
printf("bind success\n");
if(listen(sfd,128) == -1)
{
perror("listen error");
return -1;
}
printf("listen success");
struct sockaddr_in cin;
socklen_t addrlen=sizeof(cin);
fd_set readfds,tempfds;
FD_ZERO(&readfds);
FD_SET(sfd,&readfds);
FD_SET(0,&readfds);
struct sockaddr_in cin_arr[1024];
int newfd=0;
int maxfd=sfd;
while(1)
{
tempfds=readfds;
int res=select(maxfd+1,&tempfds,NULL,NULL,NULL);
if(res == -1)
{
perror("select error");
return -1;
}else if(res == 0)
{
printf("timeout\n");
return -1;
}
for(int i=0;i<=maxfd;i++)
{
if(!FD_ISSET(i,&tempfds))
continue;
if(i == sfd)
{
newfd=accept(i,(struct sockaddr*)&cin,&addrlen);
if(newfd == -1)
{
perror("accept error");
return -1;
}
printf("[%s:%d]发来请求\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port));
if(newfd>=maxfd)
maxfd=newfd;
FD_SET(newfd,&readfds);
cin_arr[newfd]=cin;
}else if(i == 0)
{
char buf[128]="";
bzero(buf,sizeof(buf));
fgets(buf,sizeof(buf),stdin);
buf[strlen(buf)-1]=0;
printf("输入的信息为：%s\n",buf);
for(int k=4;k<=maxfd;k++)
send(k,buf,strlen(buf),0);
}else
{
char rbuf[128]="";
int res=recv(i,rbuf,sizeof(rbuf),0);
if(res == 0)
{
printf("客户端已下线\n");
close(i);
FD_CLR(i,&readfds);
for(int j=maxfd;j>=sfd;j++)
{
if(FD_ISSET(j,&readfds))
{
maxfd=j;
break;
}
}
continue;
}
printf("[%s:%d]:%s\n",inet_ntoa(cin_arr[i].sin_addr),ntohs(cin_arr[i].sin_port),rbuf);
for(int k=4;k<=maxfd;k++)
{
if(k != i)
send(k,rbuf,strlen(rbuf),0);
}
}
}
}
close(sfd);
return 0;
}
poll实现TCP客户端
#include <myhead.h>
#define SER_IP "192.168.125.112"
#define SER_PORT 8888
#define CLI_IP "192.168.125.112"
#define CLI_PORT 7777
int main(int argc, const char *argv[])
{
int cfd=socket(AF_INET,SOCK_STREAM,0);
if(cfd == -1)
{
perror("socket error");
return -1;
}
struct sockaddr_in cin;
cin.sin_family=AF_INET;
cin.sin_addr.s_addr=inet_addr(CLI_IP);
cin.sin_port=htons(CLI_PORT);
if(bind(cfd,(struct sockaddr*)&cin,sizeof(cin)) == -1)
{
perror("bind error");
return -1;
}
printf("bind success\n");
struct sockaddr_in sin;
sin.sin_family=AF_INET;
sin.sin_addr.s_addr=inet_addr(SER_IP);;
sin.sin_port=htons(SER_PORT);
if(connect(cfd,(struct sockaddr*)&sin,sizeof(sin)) == -1)
{
perror("connect error");
return -1;
}
printf("connect success\n");
struct pollfd pfd[2];
pfd[0].fd=0;
pfd[0].events=POLLIN;
pfd[1].fd=cfd;
pfd[1].events=POLLIN;
char wbuf[128]="";
char rbuf[128]="";
while(1)
{
int res=poll(pfd,2,-1);
if(res == -1)
{
perror("poll error");
return -1;
}else if(res == 0)
{
printf("timeout");
return -1;
}
if(pfd[0].revents == POLLIN)
{
bzero(wbuf,sizeof(wbuf));
printf("请输入:");
fgets(wbuf,sizeof(wbuf),stdin);
wbuf[strlen(wbuf)-1]=0;
send(cfd,wbuf,strlen(wbuf),0);
printf("发送成功\n");
}
if(pfd[1].revents == POLLIN)
{
bzero(rbuf,sizeof(rbuf));
recv(cfd,rbuf,sizeof(rbuf),0);
printf("读取的内容为:%s\n",rbuf);
}
}
close(cfd);
return 0;
}
