/*
****************************************Copyright (c)**************************************************
** Guangzhou Zhiyuan Electronic Co.,LTD.
** graduate school
** http://www.zyinside.com
**
**------------------------------------- File Info ------------------------------------------------------
** File name: listener.c
** Last modified Date: 2005-12-30
** Last Version: 1.0
** Descriptions: listener of UDP.
**------------------------------------------------------------------------------------------------------
** Created by: Ganda
** Created date: 2005-12-27
** Version: 1.0
** Descriptions: Preliminary version.
**
**------------------------------------------------------------------------------------------------------
** Modified by: Chenxibing
** Modified date: 2005-12-30
** Version: 1.0.1
** Descriptions: modified for MagicARM2410.
**
********************************************************************************************************
*/
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/wait.h>
#include <sys/socket.h>
#define PORT 5000 // The port which is communicate with server
#define BACKLOG 10
#define LENGTH 512 // Buffer length
int main ()
{
int sockfd; // Socket file descriptor
int nsockfd; // New Socket file descriptor
int num;
int sin_size; // to store struct size
char revbuf[LENGTH]; // Send buffer
struct sockaddr_in addr_local;
struct sockaddr_in addr_remote;
/* Get the Socket file descriptor */
if( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1 )
{
printf ("ERROR: Failed to obtain Socket Despcritor.\n");
return (0);
}
else
{
printf ("OK: Obtain Socket Despcritor sucessfully.\n");
}
/* Fill the local socket address struct */
addr_local.sin_family = AF_INET; // Protocol Family
addr_local.sin_port = htons(PORT); // Port number
addr_local.sin_addr.s_addr = INADDR_ANY; // AutoFill local address
bzero(&(addr_local.sin_zero), 8); // Flush the rest of struct
/* Blind a special Port */
if( bind(sockfd, (struct sockaddr*)&addr_local, sizeof(struct sockaddr)) == -1 )
{
printf ("ERROR: Failed to bind Port %d.\n",PORT);
return (0);
}
else
{
printf("OK: Bind the Port %d sucessfully.\n",PORT);
}
sin_size = sizeof(struct sockaddr);
if(num = recvfrom(sockfd, revbuf, LENGTH, 0, (struct sockaddr *)&addr_remote, &sin_size) == -1)
{
printf("ERROR!\n");
}
else
{
printf("OK: %s.\n",revbuf);
}
close(sockfd);
return (0);
}
