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news_sender.c: In function ‘main’:
news_sender.c:42:8: warning: passing argument 1 of ‘close’ makes integer from pointer without a cast [-Wint-conversion]
  close((FILE*)fp);
        ^
In file included from news_sender.c:4:0:
/usr/include/unistd.h:356:12: note: expected ‘int’ but argument is of type ‘FILE * {aka struct _IO_FILE *}’
 extern int close (int __fd);
            ^~~~~
mes@ubuntu:~/TcpCom

공부좀 더해야겟음 

 

news_sender.c  보내는애

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define TTL 64
#define BUF_SIZE 30
void error_handling(char *message);

int main(int argc, char *argv[])
{
	int send_sock;
	struct sockaddr_in mul_adr;
	int time_live=TTL;
	FILE *fp;
	char buf[BUF_SIZE];
	if(argc!=3) {
	printf("Usage : %s <GroupIP> <PORT>\n", argv[0]);
	exit(1);
	}

	send_sock=socket(PF_INET, SOCK_DGRAM, 0);
	memset(&mul_adr, 0, sizeof(mul_adr));
	mul_adr.sin_family=AF_INET;
	mul_adr.sin_addr.s_addr=inet_addr(argv[1]);
	mul_adr.sin_port=htons(atoi(argv[2]));

	setsockopt(send_sock, IPPROTO_IP,
		IP_MULTICAST_TTL, (void*)&time_live, sizeof(time_live));
	if((fp=fopen("news.txt", "r"))==NULL)
		error_handling("fopen() error");

	while(!feof(fp))  /* Broadcasting */
	{
		fgets(buf, BUF_SIZE, fp);
		sendto(send_sock, buf, strlen(buf),
			0, (struct sockaddr*)&mul_adr, sizeof(mul_adr));
		sleep(2);
	}
	close((FILE*)fp);
	close(send_sock);
	return 0;
}

void error_handling(char *message)
{
	fputs(message, stderr);
	fputc('\n', stderr);
	exit(1);
}

 

이애러 뜨는데 알아봐야할듯

 

 

 

news_receiver.c 받는에 

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define BUF_SIZE 30
void error_handling(char *message);

int main(int argc, char *argv[])
{
	int recv_sock;
	int str_len;
	char buf[BUF_SIZE];
	struct sockaddr_in adr;
	struct ip_mreq join_adr;
	if(argc!=3) {
		printf("Uszge : %s <GroupIP> <PORT>\n", argv[0]);
		exit(1);
	}

	recv_sock=socket(PF_INET, SOCK_DGRAM, 0);
	memset(&adr, 0, sizeof(adr));
	adr.sin_family=AF_INET;
	adr.sin_addr.s_addr=htonl(INADDR_ANY);
	adr.sin_port=htons(atoi(argv[2]));

	if(bind(recv_sock, (struct sockaddr*) &adr, sizeof(adr))==-1)
		error_handling("bind() error");

	join_adr.imr_multiaddr.s_addr=inet_addr(argv[1]);
	join_adr.imr_interface.s_addr=htonl(INADDR_ANY);

	setsockopt(recv_sock, IPPROTO_IP,
		IP_ADD_MEMBERSHIP, (void*)&join_adr, sizeof(join_adr));

	while(1)
	{
		str_len=recvfrom(recv_sock, buf, BUF_SIZE-1, 0, NULL, 0);
		if(str_len<0)
			break;
		
		buf[str_len]=0;
		fputs(buf, stdout);
	}
	close(recv_sock);
	return 0;
}

void error_handling(char *message)
{
	fputs(message, stderr);
	fputc('\n', stderr);
	exit(1);
}