#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/ioctl.h>
#include <linux/cdrom.h>

/* drives have capabilities (CDC*) like CDC_MEDIA_CHANGED.
   These done with CDROM_SET_OPTIONS ioctl. perhaps magicdev
   should turn this off as it doesn't use anyway? */

int main(void) {
    int cd = open("/dev/cdrom", O_RDONLY|O_NONBLOCK); /* This causes VFS: disk change ... */
    while(1) {
        //int cd = open("/dev/cdrom", O_RDONLY|O_NONBLOCK);
        printf ("media changed[%d]\n", ioctl(cd, CDROM_MEDIA_CHANGED, CDSL_CURRENT));
        /*
        switch (ioctl(cd, CDROM_DRIVE_STATUS, CDSL_CURRENT)) {
            case CDS_DISC_OK: printf("DISK_OK\n"); break;
            case CDS_TRAY_OPEN: printf("TRAY_OPEN\n"); break;
            case CDS_DRIVE_NOT_READY: printf("DRIVE_NOT_READY\n"); break;
            default: printf("default\n"); break;
        }
        */
        //close(cd);
        sleep(2);
    }
}