libftdi Archives

Subject: RE: Design decisions, was: Re: Claiming devices...

From: "Michael Plante" <michael.plante@xxxxxxxxx>
To: <libftdi@xxxxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 6 Oct 2010 09:14:24 -0500
Xiaofan Chen wrote:
>> My vote is to unload. If not, the user should not use libftdi in the
>> first place.

Agreed, though see the post in libusb-devel just now.  Checking active and
then unloading may be racy, if I understand the original thread from a year
and half ago right.  Between when you decided to unload and when you
actually unload ftdi_sio, another program may have already unloaded ftdi_sio
itself.  We need a way to check after detaching just what we detached, and,
even then, it's not good.

>> > -- some other application has claimed the device via usbfs, should we
>> > claiming and continue or should we exit
>> Either way. I would more inclined to exit and I tend to think it is a
>> libusb bug so that you can force claiming.

I would certainly not blindly detach usbfs.  Either give the option via an
argument or exit.

>> > -- If we unloaded ftdi_sio, should we attach it again on exit
>> Either way.

Not sure.


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