#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/ioctl.h>
#include <scsi/sg.h>

void hexdump(unsigned char *b, int len)
{
	int i;
	for (i = 0; i < len; i++)
		printf("%02x", b[i]);

	printf("\n");
}

int do_getev(int fd)
{
	unsigned char cdb[10] = { 0x4a, 1, 0, 0, 16, 0, 0, 0, 8, };
	unsigned char buffer[8];
	struct sg_io_hdr h;
	int ret;

	memset(buffer, 0, sizeof(buffer));
	memset(&h, 0, sizeof(h));

	h.interface_id = 'S';
	h.cmd_len = sizeof(cdb);
	h.dxfer_direction = SG_DXFER_FROM_DEV;
	h.dxfer_len = sizeof(buffer);
	h.dxferp = buffer;
	h.cmdp = cdb;
	h.timeout = 5000;

	ret = ioctl(fd, SG_IO, &h);
	if (ret) {
		printf("SG_IO failed\n");
		return -1;
	}

	printf("status %d\n", h.status);
	if (!h.status)
		hexdump(buffer, sizeof(buffer));
	return h.status;
}

int main(int argc, char *argv[])
{
	int fd;

	if (argc < 2) {
		fprintf(stderr, "%s: device\n", argv[0]);
		return 1;
	}

	fd = open(argv[1], O_RDONLY | O_NONBLOCK);
	if (fd == -1) {
		perror("open");
		return 1;
	}

	do_getev(fd);

	close(fd);
	return 0;
}