[antofic]

I have the file path of a CD driver or a DVD driver when a disk is inserted, i.e:
"/Volumes/DVD_Movie"
and I want to obtain the device path, i.e:
"/dev/disk2"

How to, using C, C++ or Objective-C?

[Chuckit]

The function statfs() in sys/mount.h is what you want. You pass in the path to the mount, and in the structure returned, the field you're interested in is f_mntfromname.

[antofic]

Thanks

[WJMoore]

I am looking to do the same thing as the original poster and tried using statfs, which does indeed return the device path as /dev/device. I am then wishing to look up the device in the IORegistry. The problem is the IORegistry just has the name, so /dev/disk6 is "BSD Name" => "disk6". Now one option would be to just remove _PATH_DEV (defined in paths.h) from the start of the string and use that, which would probably work fine.

I did however find the VolumeToBSDNode code sample which shows how get the BSD node for all mounted volumes. It uses FSGetVolumeInfo then PBHGetVolParmsSync to achieve this. However I don't want to iterate across all volumes, I already have the path to the volume I want. FSGetVolumeInfo requires the FSVolumeRefNum of the volume. From what I can find the only way to get this is via GetVRefNum which itself requires a fileRefNum to an open file on the volume - something I don't have.

Does anyone know of any other methods to get FSVolumeRefNum from a /Volumes/blah path?