So, tonight I didn’t sleep at all. This was planned and intended, but that is another story.
So, while I was passing the time, I decided it was the case to work a while more on unieject. First I decided to release a 5.3.1 version to fix a segmentation fault and to update translations.
Then after looking at the new
eject -h output, I decided to implement the traytoggle option, so I started adding the support inside unieject for that, but I had no idea how to check if I had to eject or close the tray, so I looked at original eject’s code, as usual. The code there is pretty experimental, I’d say: it measures the time needed for the tray to close, and if it’s lower than a given value, it then ejects the tray.
Not sure what you think, but I don’t like such a method 🙂
There had to be a way to tell if the tray is open or closed, so I started looking into raw MMC commands. Unfortunately I still don’t have a proper documentation for MMC commands, and that sucks, I should probably look for one, but anyway.
Googling, I was able to find from Apple’s OpenSource pages one of the headers for the SCSI interface, and in that I found some command that had an interesting name:
GET_EVENT_STATUS_NOTIFICATION. Googling again for that, I found the
IOSCSIMultimediaCommandsDevice::GetTrayState() function, that was exactly what I needed 🙂
After looking a bit also to libcdio sources, I was able to put that in a function that actually checks the status of the tray before deciding to open or close it, adding support for traytoggle to unieject in a saner way than original eject.
Now, who said that having access to the source, even under a restrictive license, is not a good thing? 🙂