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void send_to_all(int sockfd,struct sockaddr_in* clientGroup,char* buff,int num)
{
int i = 0;
int rel;
printf("message is %s\n",buff);
printf("num == %d\n",num);
for(;i < num;i++)
{
printf("sendto %d\n",clientGroup[num].sin_addr.s_addr);
rel = sendto(sockfd,buff,30,0,(struct sockaddr *)&(clientGroup[i]),sizeof(struct sockaddr));
printf("rel == %d\n",rel);
if(rel == -1)
{
perror("sendto:");
}
}
}