udp_server.zip_udp server

#include <stdlib.h> #include <stdio.h> #include <errno.h> #include <string.h> #include <unistd.h> #include <netdb.h> #include <sys/socket.h> #include <netinet/in.h> #include <sys/types.h> #include <arpa/inet.h> #define SERVER_PORT 8888 #define MAX_MSG_SIZE 1024 void udps_respon(int sockfd) { struct sockaddr_in addr; int addrlen,n; char msg[MAX_MSG_SIZE]; while(1) { /* 从网络上读,并写到网络上 */ bzero(msg,sizeof(msg)); // 初始化,清零 addrlen = sizeof(struct sockaddr); n=recvfrom(sockfd,msg,MAX_MSG_SIZE,0,(struct sockaddr*)&addr,&addrlen); // 从客户端接收消息 msg[n]=0; /* 显示服务端已经收到了信息 */ fprintf(stdout,"Server have received %s",msg); // 显示消息 } } int main(void) { int sockfd; struct sockaddr_in addr; /* 服务器端开始建立socket描述符 */ sockfd=socket(AF_INET,SOCK_DGRAM,0); if(sockfd<0) { fprintf(stderr,"Socket Error:%s\n",strerror(errno)); exit(1); } /* 服务器端填充 sockaddr结构 */ bzero(&addr,sizeof(struct sockaddr_in)); addr.sin_family=AF_INET; addr.sin_addr.s_addr=htonl(INADDR_ANY); addr.sin_port=htons(SERVER_PORT); /* 捆绑sockfd描述符 */ if(bind(sockfd,(struct sockaddr *)&addr,sizeof(struct sockaddr_in))<0) { fprintf(stderr,"Bind Error:%s\n",strerror(errno)); exit(1); } udps_respon(sockfd); // 进行读写操作 close(sockfd); }