udp通信

int main()
{
	// 创建套接字
	int fd = socket(AF_INET, SOCK_DGRAM, 0);
	perror("socket");
	struct sockaddr_in addr;
	addr.sin_family = AF_INET;
	addr.sin_addr.s_addr = inet_addr("192.168.68.152");
	addr.sin_port = htons(8888);
	socklen_t l = sizeof(addr);
	bind(fd, (struct sockaddr*)&addr, l);
	perror("bind");

	char buf[1000];
	// while (1)
	{
		bzero(buf, 1000);
		recvfrom(fd, buf, 1000, 0, (struct sockaddr*)&addr, &l);
		perror("recvfrom");
		sendto(fd, buf, 1000, 0, (struct sockaddr*)&addr, l);
	}
	close(fd);

	return 0;	
}