linux网络编程UDP服务器和客户端代码

#include<stdio.h> #include<string.h> #include<stdlib.h> #include<sys/types.h> #include<sys/socket.h> #include<netinet/in.h> #include<netdb.h> #include<sys/poll.h> #include"PublicFunctions.h" #define oops(m,x) {perror(m);exit(x);} #define BUFSIZE 1024 //设置缓冲大小 #define SERV_PORT 8888 //端口号 void sad_who_called(struct sockaddr_in *addrp){ char host[BUFSIZE]; int port; get_internet_address(host,BUFSIZE,&port,addrp);//获取客户端IP地址 printf("from %s:%d\n",host,port); } int main(int ac,char *av[]){ int sock_fd; //套接子描述符号 int recv_num; int send_num; int client_len; char recv_buf[20]; struct sockaddr_in addr_serv; struct sockaddr_in addr_client;//服务器和客户端地址 int port=0; sock_fd = socket(AF_INET,SOCK_DGRAM,0); if(sock_fd < 0){ oops("socket",1); } else{ printf("sock sucessful\n"); } //初始化服务器断地址 memset(&addr_serv,0,sizeof(struct sockaddr_in)); addr_serv.sin_family = AF_INET; //协议族 addr_serv.sin_port = htons(SERV_PORT); //设置端口 addr_serv.sin_addr.s_addr = htonl(INADDR_ANY); //任意本地址 client_len = sizeof(struct sockaddr_in); if(bind(sock_fd,(struct sockaddr *)&addr_serv,sizeof( struct sockaddr_in ))<0)//绑定失败 { oops("bind",1); } while(1){ printf("begin recv:\n"); recv_num = recvfrom(sock_fd,recv_buf,sizeof(recv_buf),0,(struct sockaddr *)&addr_client,&client_len); if(recv_num < 0){ printf("bad\n"); oops("again recvfrom",1); } else{ recv_buf[recv_num]='\0'; sad_who_called( &addr_client); printf("recv sucess:%s\n",recv_buf); } } close(sock_fd); return 0; }