UDP-客户端简单快捷模板

/* client.c */
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include "error.h"
#define MAXLINE 80
#define SERV_PORT 8000
int main(int argc, char *argv[])
{
 struct sockaddr_in servaddr;
 int sockfd, n;
 char buf[MAXLINE];
 char str[INET_ADDRSTRLEN];
 socklen_t servaddr_len;
 //socket
 sockfd = Socket(AF_INET, SOCK_DGRAM, 0);
 //remote addr
 bzero(&servaddr, sizeof(servaddr));
 servaddr.sin_family = AF_INET;
 inet_pton(AF_INET, "127.0.0.1", &servaddr.sin_addr);
 servaddr.sin_port = htons(SERV_PORT);

 while (fgets(buf, MAXLINE, stdin) != NULL)
 {
  //write(sockfd,buf,strlen(buf));
  n = sendto(sockfd,buf,strlen(buf),0,(struct sockaddr*)&servaddr,sizeof(servaddr));
  if (n == -1)
   perr_exit("sendto error");
  //
  n = recvfrom(sockfd, buf, MAXLINE, 0, NULL, 0);
  if (n == -1)
   perr_exit("recvfrom error");
  Write(STDOUT_FILENO, buf, n);
 }
 Close(sockfd);
 return 0;
}
//write(sockfd,buf,count)
//send(sockfd,buf,count,flag)
//ssize_t send(int sockfd, const void *buf, size_t
 //nbytes, int flags);

//sendto(sockfd,buf,count,flag,struct
/*ssize_t sendto(int sockfd, const void *buf, size_t
 nbytes, int flags,
               const struct sockaddr *destaddr,
 socklen_t destlen);
*/
/*
read(sockfd,buf,count)
recv(sockfd,buf,count,flags)
recvfrom()

*/