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Old 06-12-2008, 03:05 AM   #1
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Talking to an I/O device


I'm trying to write an application in C that sends SCSI commands to a USB Mass Storage device in Linux. I know how to do this in Windows using devioctl library function calls, but I've no experience doing this in Linux. From what I've gathered the equivalent function call is ioctl, but I'm not sure how to use it. I've read the man pages and some online help/tutorials but the call seems to be quite different from the way it's used in Windows...or maybe I'm understanding it wrongly.

Are there any tutorials on device communication programming?

Old 06-12-2008, 07:44 AM   #2
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ioctl behaves differently for almost every driver, so you'll have to look at the scsi driver source to see the supported ioctls
Old 06-12-2008, 01:29 PM   #3
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IMHO, the biggest difference is that windows has separate input and output buffers whereas linux uses a common buffer. At a minumum, you'll need to determine what the equivalent linux IOCTL is for each windows IOCTL and switch to the corresponding common linux data structure. Even that may not be enough - I don't know enough about how the storage stack is implemented on linux to know if issuing the same stream of SCSI commands will do the same as it does on windows. You would think it should (SCSI is SCSI after all), but never assume anything when dealing with kernels.



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