udp_server

/*****************************************************
copyright (C), 2014-2015, Lighting Studio. Co.,     Ltd. 
File name：
Author：Jerey_Jobs    Version:0.1    Date: 
Description：
Funcion List: 
*****************************************************/


#include <stdio.h>
#include <sys/socket.h>
#include <string.h>
#include <stdlib.h>
#include <netinet/in.h>


int main()
{
int sockfd;
int n;
struct sockaddr_in servaddr,cliaddr;
socklen_t clilen;
char msg[1000];
int i;


sockfd = socket(AF_INET,SOCK_DGRAM,0);
bzero(&servaddr,sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(3000);


bind(sockfd,(struct sockaddr *)&servaddr,sizeof(servaddr));
for(;;)
{
clilen = sizeof(cliaddr);
for(;;)
{
n = recvfrom(sockfd,msg,1000,0,(struct sockaddr*)&cliaddr,&clilen);
printf("--------------\n");
msg[n] = '\0';
printf("%s\n",msg);
printf("--------------\n");
for(i = 0;i < n;i++)
{
if(msg[i] >= 'a' && msg[i] <= 'z')
msg[i] -= 32;
}
sendto(sockfd,msg,strlen(msg),0,(struct sockaddr*)&cliaddr,clilen);
}
close(sockfd);
}
    return 0;
}