Hi everyone,
I write programs for multicasting but its giving some kind of error. Can anyone help with these?
MulticastClient.cpp
Code:
#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <string.h>
int main(int argc, char *argv[]) {
struct sockaddr_in sa;
int s, n = sizeof(struct sockaddr), on = 1, len = strlen(argv[1]);
if ( (s = socket(AF_INET,SOCK_DGRAM,0)) < 0 ) return(1);
if ( setsockopt(s, SOL_SOCKET, SO_BROADCAST, // broadcast option
(void *)&on, sizeof(on)) != 0) return(1);
sa.sin_family = AF_INET;
sa.sin_addr.s_addr = htonl(INADDR_BROADCAST); // 255.255.255.255
sa.sin_port = htons(1111);
sendto(s, argv[1], len, 0, (const struct sockaddr *)&sa, n);
}
And MulticastServer.cpp
Code:
#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <string.h>
int main(int argc, char *argv[]) {
struct sockaddr_in sa;
int s, n = sizeof(struct sockaddr), on = 1, len = strlen(argv[1]);
if ( (s = socket(AF_INET,SOCK_DGRAM,0)) < 0 ) return(1);
if ( setsockopt(s, SOL_SOCKET, SO_BROADCAST, // broadcast option
(void *)&on, sizeof(on)) != 0) return(1);
sa.sin_family = AF_INET;
sa.sin_addr.s_addr = htonl(INADDR_BROADCAST); // 255.255.255.255
sa.sin_port = htons(1111);
sendto(s, argv[1], len, 0, (const struct sockaddr *)&sa, n);
}
when i try to comile it it giving following error:
Code:
bash-3.00$ CC MulticastClient.cpp -o MulticastClient
Undefined first referenced
symbol in file
sendto MulticastClient.o
socket MulticastClient.o
setsockopt MulticastClient.o
ld: fatal: Symbol referencing errors. No output written to MulticastClient
bash-3.00$
can anyone tell me how to fix it??
