#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>

#define BLKCOPY _IO(0x12,129)

int main(int argc, char *argv[])
{
	int h, r;
	uint64_t arg[4];
	if (argc < 5) fprintf(stderr, "argc\n"), exit(1);
	h = open(argv[1], O_RDWR);
	if (h < 0) perror("open"), exit(1);
	arg[0] = strtoll(argv[2], NULL, 10);
	arg[1] = strtoll(argv[3], NULL, 10);
	arg[2] = strtoll(argv[4], NULL, 10);
	arg[3] = 0;
	r = ioctl(h, BLKCOPY, &arg);
	if (r) fprintf(stderr, "ioctl: %d, %s, %llx\n", r, strerror(errno), (unsigned long long)arg[3]), exit(1);
	if (arg[2] != arg[3]) {
		printf("short copy: %llx != %llx\n", (unsigned long long)arg[2], (unsigned long long)arg[3]);
		exit(1);
	}
	close(h);
	return 0;
}