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#include<stdio.h>
#include<string.h> //strlen
#include<sys/socket.h>
#include <unistd.h>
#include<arpa/inet.h> //inet_addr
#include "com.h"
void rcvIPFromMaster()
{
int socketID;
struct sockaddr_in SockAddr;
int allowBC=1;
socketID=socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
setsockopt(socketID,SOL_SOCKET,SO_BROADCAST,(void*) &allowBC,sizeof(allowBC));
SockAddr.sin_family=AF_INET;
SockAddr.sin_port=htons(DATA_PORT);
SockAddr.sin_addr.s_addr=htonl(INADDR_BROADCAST);
int binded=bind(socketID,(struct sockaddr *) &SockAddr,sizeof(SockAddr));
if(binded<0){
puts("Failed to bind socket for receiving IP from master.");
close(socketID);
}
else{
listen(socketID,3);
socklen_t src_addr_len=sizeof(SockAddr);
char buffer[MASTER_IP_SIZE];
memset(buffer, 0x0,MASTER_IP_SIZE);
recvfrom(socketID,buffer,sizeof(buffer),0,(struct sockaddr*)&SockAddr,&src_addr_len);
close(socketID);
puts(buffer);
pthread_mutex_lock(&mutex_master_ip);
memset(MASTER_IP, 0x0,MASTER_IP_SIZE);
memcpy(MASTER_IP, buffer,MASTER_IP_SIZE);
pthread_mutex_unlock(&mutex_master_ip);
}
}
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