site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com Importance: Normal User-agent: SquirrelMail/1.4.5 Chris, I am familiar with the ioctls in IOCDMediaBSDClient (READ, READ TOC, etc). I would like to use (primarily) the READ (10 or 12) command. I need to set the FUA bit- I don't believe this is possible with the DKIOCCDREAD ioctl.

Stephen --

What type of raw commands are you trying to send? Have you looked at the list of CD ioctls OS X supports?

-- Chris

On Jan 24, 2006, at 3:46 PM, me@sbooth.org wrote:

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Hi Chris,

Thanks for the response!

...

You might want to start out with what you are trying to achieve. Are you trying to send commands from kernel-level code or user-level code?

Preferably user-level.

...

If the latter, you might want to check out the sample code found in / Developer/Examples/IOKit/scsi/SCSITaskLib and consult Accessing Hardware From Applications (http://developer.apple.com/documentation/ DeviceDrivers/Conceptual/AccessingHardware/AH_Intro/ chapter_1_section_1.html).

I've read these now (thanks for the pointer), and also consulted the example code, but I'm still confused. The problem for me is that this all seems geared towards CD/DVD authoring and authoring-capable devices. For my application authoring doesn't matter. All I "need" to do is send a small subset of the MMC-2 commands to the drive to access an audio CD. I have had some success creating an MMCDeviceInterface, but that really doesn't help me because I can't obtain exclusive access from SCSITaskDeviceInterface. Even if I could, I'm not sure how that would help me because I really don't want to send raw SCSI tasks. I still don't understand enough about IOServiceGetMatchingServices to know which key to pass in to try and get an IOSCSIMultimediaCommandsDevice.

Stephen

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HTH,

-- Chris

On Jan 24, 2006, at 2:30 PM, me@sbooth.org wrote:

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I will start by saying the IOKit is pretty much a black box for me. I've done only basic tasks such as creating a dictionary and calling IOServiceGetMatchingServices for it. Unless I've missed something, the IOKit documentation is slightly less than stunning so I'm asking for help here.

I want to create an IOSCSIMultimediaCommandsDevice for accessing an audio CD using MMC-2 commands.

If I may rant for a moment, the superclass to IOSCSIMultimediaCommandsDevice is IOSCSIPrimaryCommandsDevice defined in "IOSCSIPrimaryCommandsDevice.h". I don't even have that header file in my 10.4u SDK! It's only in the 10.3.9 IOKit. To boot, that class' superclass is IOSCSIProtocolInterface which also appears only to exist in my 10.3.9 SDK.

Anyway, IOSCSIMultimediaCommandsDevice is a subclass of IOService. Can anyone step me through how I would go about obtaining an instance of this class?

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