Udev : no "change" action for cd/dvd (optical) - helping tool

Question

i was writing udev rules for usb storage auto-mount and umount. it works great. no other tools than udev is needed.
BUT when it comes to optical drives, udev isn't that great.
on 2 out of my 3 optical drives udev does not perform any "change" action
so, there is no action at all when changing cd/dvd media and watching:
$ udevadm monitor
it seems that either udev or the optical drive is "asleep", not sending media change info
i found a solution.
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <linux/cdrom.h>
int
main(int argc, char *argv[])
if (argc < 2) {
printf("USAGE: %s DEVICE\n", argv[0]);
return 1;
int h;
for (;;) {
h = open(argv[1], O_RDONLY | O_NONBLOCK);
if (h < 0) {
perror("open");
return 1;
close(h);
sleep(1);
$ cdromkeepawake /dev/sr0
this tool opens and closes a handle to the optical drive every second.
it keeps the drive "awake" (i really don't know why this works at all)
with this tool running in the background udev "catches" all changes and sends "change" action like it should.
auto-mount and umount for optical drives using only udev rules is possible now.
i want to hear if this "solves" your udev-optical-drive-problem also?
it would be great if someone could tell the udev developers about that. their site on kernel.org isn't up...

Answer 1

Some new facts about my problem.
I tried this, as wine application was asking for a /dev/sg0 file which doesn't exist anymore:
ln -s /dev/sr0 /dev/sg0
chown root:disk /dev/sg0
Quite ugly, but if it works...
But it didn't. The new error message is:
err:aspi:SCSI_OpenDevice Failed to open device /dev/sg0: Système de fichiers accessible en lecture seulement
The french part means that the filesystem is accessible only in reading. The wine application is EAC (CD extractor to FLAC files); it does'nt write on disk, but I guess it needs to have more rights on /dev/sr0. I don't want to make more crazy things like changing rights on /dev/sr0 or starting a wine application on root.
Would anyone have an idea?