I am developing user level driver for "USB BULK device" on Mac OS X 10.4.5 using IOKitFramework, CoreFoundation, XCode 2.2.
The primary requirement is that Multiple applications can have access to the device at a time. I am encountering following situation when run with multiple applications:
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The driver works fine with the single app but when I start 2nd application, and return back to first application, the driver is able to
1. Open the device, but fails to Open the Interface i.e
USBInterfaceOpen returns 2c0 error which means "No such device"
2. And when I revert back to first application , the driver fails to Open the device, i.e
USBDeviceOpen returns error 2c5 which means "exclusive access and device already open"
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I am using USBDeviceOpen to open the device and USBInterfaceOpen to open the interface.
Thinking that there may be problem of synchronization, i also applied lock and unlock but still the problem remains the same.
also, i tried with USBDeviceOpenSeize and USBInterfaceOpenSeize, but still the problem remains the same.
What can be the issue ? All suggestions / comments are welcome.
Thanks and Regards,
Rohit Dhamija
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