简单的UDP回射程序

#include <stdio.h>
#include <string.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>
#define MAXSIZE 1024
#define SERVER_PORT 2000
void dg_client (FILE* fp,int sockfd, const struct sockaddr * pservaddr,socklen_t serverlen)
{
int n;
char sendline[MAXSIZE],recvline[MAXSIZE+1];
printf("From Client: ");
while(fgets(sendline,MAXSIZE,fp)!=NULL)
{
sendto(sockfd,sendline,strlen(sendline),0,pservaddr,serverlen);
n=recvfrom(sockfd,recvline,MAXSIZE,0,NULL,NULL);
recvline[n]='\0';
fputs(recvline,stdout);
printf("From Client: ");
}
}
int main (int args, char ** argv )
{
int sockfd;
struct sockaddr_in serveraddr;
bzero(&serveraddr,sizeof(serveraddr));

serveraddr.sin_family=AF_INET;
serveraddr.sin_port=htons(SERVER_PORT);
inet_pton(AF_INET,"10.3.1.215",&serveraddr.sin_addr);
sockfd=socket(AF_INET,SOCK_DGRAM,0);
dg_client(stdin,sockfd,(struct sockaddr * )&serveraddr,sizeof(serveraddr));
return 0;

}