libftdi Archives

Subject: Re: Claiming devices has no effect under Linux

From: Thomas Jarosch <thomas.jarosch@xxxxxxxxxxxxx>
To: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
Date: Tue, 5 Oct 2010 15:20:29 +0200
On Tuesday, 5. October 2010 14:35:25 Thomas Klose wrote:
> If I open a ftdi device in an instance of our application it seems not
> to be claimed for exclusive access. A second instance of the application
> can "steal" the device later.
> I found in the sources of libftdi that the libusb function
> usb_claim_interface() is called correctly by ftdi_usb_open_dev(). It was
> my understanding that usb_claim_interface() marks the device to be "in
> use" and a second call would result in an appropriate error.

Well, the function does what it's named after: Claim the device, no matter 
who is currently using it: Kernel driver or another libftdi instance.


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