#include <fcntl.h>
#include <linux/dvb/ca.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <unistd.h>

int cam_status(int fd)
{
	ca_slot_info_t info;
	memset(&info, 0, sizeof(info));
	info.num = 0;

	if (ioctl(fd, CA_GET_SLOT_INFO, &info) != 0) {
		printf("error: couldn't get slot info\n");
		return -1;
	}

	return info.flags;
}

struct timeval start_time;

void print_status(int status)
{
	struct timeval time;
	gettimeofday(&time, NULL);

	int dsec = time.tv_sec - start_time.tv_sec;
	int dusec = time.tv_usec - start_time.tv_usec;

	if (dusec < 0) {
		dusec += 1000000;
		dsec -= 1;
	}

	printf("%i.%06i: %i\n", dsec, dusec, status);
}

int main()
{
	int fd = open("/dev/dvb/adapter0/ca0", O_RDWR);

	if (fd < 0) {
		printf("error: couldn't open ca handle\n");
		return 1;
	}

	gettimeofday(&start_time, NULL);

	int status = cam_status(fd);
	print_status(status);

	if (ioctl(fd, CA_RESET, (1 << 0)) != 0) {
		printf("error: couldn't reset cam\n");
		return 1;
	}

	int i;
	for (i = 0; i < 200; ++i) {
		int new_status = cam_status(fd);

		if (status != new_status) {
			status = new_status;
			print_status(status);
		}

		usleep(10000);
	}

	return 0;
}