Programming

while (1) {
	if ((numbytes = recv(sock2, buf, 100, 0)) == -1) {
		perror("recv");
	}
	printf("%s : %s", inet_ntoa(their_addr.sin_addr), buf);
}

while (1) {
	if ((numbytes = recv(sock2, buf, sizeof(buf), 0)) ==-1) {
		perror("recv");
                          break;
	}
	if (!numbytes) {
		printf("EOF\n");
                          break;
	}
	printf("%s : ", inet_ntoa(their_addr.sin_addr));
	fwrite(buf,numbytes,1,stdout);
             printf("\n");
}

memset(buf,0,sizeof(buf));