0727，学什么学，周六就应该休息！！！！！

周六就应该休息，一天就忙了两小时也不是我的错喵

目录

UDP的小总结

01：使用select实现一个基于UDP的一对一即时聊天程序。 

1.0 复读机服务器和树洞客户端

2.0 byby不了一点的敬业服务器！！！

今天到此为止！！！！

UDP的小总结

client :  socket -->            sendto / recvfrom --> close
server :  socket --> bind   --> recvfrom /sendtoint sockect (int domain,int type,int protocol);
//domain      AF_INET       AF_INET6
//type        SOCK_STREAM   SOCK_DGAM
//protocol    IPPROTO_TCP   IPPRPTP_UDPssize_t sendto (int sockfd,const void* buff,size_t len,int flags,
const struct sockaddr*dest_addr,socklen_t addrlen);ssize_t recvfrom (int sockfd,const void* buff,size_t len,int flags,
const struct sockaddr*dest_addr,socklen_t addrlen);

01：使用select实现一个基于UDP的一对一即时聊天程序。 

1.0 复读机服务器和树洞客户端

#include <func.h>
//server.c
int main()
{//addrstruct sockaddr_in addr;memset(&addr,0,sizeof(addr));addr.sin_family=AF_INET;addr.sin_port=htons(8082);addr.sin_addr.s_addr=inet_addr("192.168.235.128");socklen_t len=sizeof(addr);//soekct int sofd=socket(AF_INET,SOCK_DGRAM,0);//bindint ret=bind(sofd,(struct sockaddr*)&addr,sizeof(addr));if(ret==-1){};//readfds  old_fds fd_max buff[]fd_set readfds;fd_set old_fds;FD_SET(sofd,&readfds);//stdin server加入监听FD_SET(STDIN_FILENO,&readfds);old_fds=readfds;char buff[4096]={0};int fd_max=sofd;while(1){readfds=old_fds;select(fd_max+1,&readfds,NULL,NULL,NULL);if(FD_ISSET(sofd,&readfds)){ret=recvfrom(sofd,buff,4096,0,NULL,NULL);if(ret<0){};if(strcmp(buff,"byby\n")==0){close(sofd);}printf("----%s\n",buff);}if(FD_ISSET(STDIN_FILENO,&readfds)){memset(buff,0,sizeof(buff));fgets(buff,4096,stdin);ret=sendto(sofd,buff,strlen(buff)+1,0,(struct sockaddr*)&addr,sizeof(struct sockaddr));if(ret<0){};}}return 0;
}

#include <func.h>
//client.c
int main()
{//addrstruct sockaddr_in addr;memset(&addr,0,sizeof(addr));addr.sin_family=AF_INET;addr.sin_port=htons(8082);addr.sin_addr.s_addr=inet_addr("192.168.235.128");socklen_t len=sizeof(addr);//soekct int sofd=socket(AF_INET,SOCK_DGRAM,0);//readfds  old_fds fd_max buff[]fd_set readfds;fd_set old_fds;FD_SET(sofd,&readfds);//stdin server加入监听FD_SET(STDIN_FILENO,&readfds);old_fds=readfds;char buff[4096]={0};int fd_max=sofd;while(1){readfds=old_fds;select(fd_max+1,&readfds,NULL,NULL,NULL);if(FD_ISSET(sofd,&readfds)){recvfrom(sofd,buff,4096,0,NULL,NULL);if(strcmp(buff,"byby\n")==0){close(sofd);}printf("----%s\n",buff);}if(FD_ISSET(STDIN_FILENO,&readfds)){memset(buff,0,sizeof(buff));fgets(buff,4096,stdin);sendto(sofd,buff,strlen(buff)+1,0,(struct sockaddr*)&addr,sizeof(struct sockaddr));}}return 0;
}

2.0 byby不了一点的敬业服务器！！！

#include <func.h>
//client.c
int main()
{//addrstruct sockaddr_in addr;memset(&addr,0,sizeof(addr));addr.sin_family=AF_INET;addr.sin_port=htons(8083);addr.sin_addr.s_addr=inet_addr("192.168.235.128");socklen_t len=sizeof(addr);//soekct int sofd=socket(AF_INET,SOCK_DGRAM,0);//bindint ret=bind(sofd,(struct sockaddr*)&addr,sizeof(addr));if(ret==-1){};//readfds  old_fds fd_max buff[]fd_set readfds;fd_set old_fds;FD_SET(sofd,&readfds);//stdin server加入监听FD_SET(STDIN_FILENO,&readfds);old_fds=readfds;char buff[4096]={0};int fd_max=sofd;struct sockaddr_in cline_addr;socklen_t addr_len;while(1){readfds=old_fds;select(fd_max+1,&readfds,NULL,NULL,NULL);if(FD_ISSET(sofd,&readfds)){ret=recvfrom(sofd,buff,4096,0,(struct sockaddr*)&cline_addr,&addr_len);if(ret<0){};if(strcmp(buff,"byby")==0){close(sofd);}printf("----%s\n",buff);}if(FD_ISSET(STDIN_FILENO,&readfds)){memset(buff,0,sizeof(buff));fgets(buff,4096,stdin);ret=sendto(sofd,buff,strlen(buff)+1,0,(struct sockaddr*)&cline_addr,sizeof(struct sockaddr));if(ret<0){};}}return 0;
}

开心！！！！！！开心！！！！！！！开心！！！！！！！ 
723的作业会写了喵！！！！！聪明小辉！！！

今天到此为止！！！！！