#include  
#include  
#include 
#include  
#include 
#include 

#define MAX_CLIENT_NUM  10

#define LOG_ERROR(module_id, format...) \
do{ \
	printf(format); \
}while(0)


int main(int argc, char *argv[])
{
	int server_sockfd, client_sockfd;
	int server_len, client_len;
	struct sockaddr_un server_sockaddr;
	struct sockaddr_un client_address;
	int i;
	int bytes;
	char ch_send,ch_recv;
	
	unlink ("/home/user/test/server");
	
	server_sockfd = socket(AF_UNIX, SOCK_DGRAM, 0); //建立 socket, 通訊協議為AF_UNIX, SOCK_DGRAM 資料方式
	if (server_sockfd < 0)
	{
		LOG_ERROR(SERVER_DAEMON_ID, "Socket create failed, error: %s\n",  strerror(errno));
		exit (EXIT_FAILURE);
	}

	bzero(&server_sockaddr, sizeof(server_sockaddr));
	server_sockaddr.sun_family = AF_UNIX ; //配置伺服器資訊(通訊協議)
	strcpy(server_sockaddr.sun_path, "/home/user/test/server");
	server_len = sizeof(server_sockaddr); //配置伺服器資訊(伺服器地址長度)
	
	if (bind(server_sockfd, (struct sockaddr *)&server_sockaddr, server_len) < 0)
	{
		LOG_ERROR(SERVER_DAEMON_ID, "Socket bind failed, error: %s\n", strerror(errno));
		exit (EXIT_FAILURE);
	}


	client_len = sizeof(client_address);

	for (i = 0, ch_send = '1'; i < 5; i++, ch_send++) 
	{
		if ((bytes = recvfrom(server_sockfd, &ch_recv, 1, 0, (struct sockaddr *)&client_address, (socklen_t *)&client_len)) == -1) 
		{
			perror ("recvfrom");
			exit (EXIT_FAILURE);
		}


		printf ("The character receiver from client[%s] is %c\n", client_address.sun_path, ch_recv);
		sleep (1);
		if ((bytes = sendto(server_sockfd, &ch_send, 1, 0, (struct sockaddr *)&client_address, client_len)) == -1) 
		{
			perror ("sendto");
			exit (EXIT_FAILURE);
		}
			
	}
	
	close (client_sockfd);
	unlink ("/home/user/test/server");

}