文章目录
- 1.半关闭shutdown
- 2.端口复用setsockopt
- 2.1 程序中遇到的问题
- 2.2 端口复用
- 3.多路I/O转接
- 3.1 什么是多路I/O转接服务器？
- 3.2 select
- 3.3 poll
- 3.4 epoll
- 3.4.1 epoll API
1.半关闭shutdown
2.端口复用setsockopt
2.1 程序中遇到的问题
2.2 端口复用
#include<stdio.h>
#include<unistd.h>
#include<sys/socket.h>
#include<stdlib.h>
#include<ctype.h>
#include<arpa/inet.h>#define SERV_PORT 6666
int main()
{int lfd,cfd;struct sockaddr_in serv_addr,clie_addr;socklen_t clie_addr_len,clie_IP_len;char buf[BUFSIZ],clie_IP[BUFSIZ];int n,ret;lfd = socket(AF_INET,SOCK_STREAM,0);//端口6666复用int opt = 1;setsockopt(lfd,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt));if(lfd==-1){perror("socket error");exit(1);}serv_addr.sin_family = AF_INET;serv_addr.sin_port = htons(SERV_PORT);serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);ret = bind(lfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr));if(ret==-1){perror("bind error");exit(1);}ret = listen(lfd,128);if(ret==-1){perror("listen error");exit(1);}clie_addr_len = sizeof(clie_addr);cfd = accept(lfd,(struct sockaddr *)&clie_addr,&clie_addr_len);if(cfd==-1){perror("accept error");exit(1);}printf("client IP:%s,client port:%d\n",inet_ntop(AF_INET,&clie_addr.sin_addr.s_addr,clie_IP,sizeof(clie_IP)),ntohs(clie_addr.sin_port));while(1){n = read(cfd,buf,sizeof(buf));for(int i=0;i<n;i++){buf[i] = toupper(buf[i]);}write(cfd,buf,n);}close(lfd);close(cfd);return 0;
}
3.多路I/O转接
3.1 什么是多路I/O转接服务器？
3.2 select
3.3 poll
3.4 epoll
3.4.1 epoll API
