Re: [Libusb-devel] libusb-1.0

[Michael W. <mic...@gm...>]

On 12/11/08, Daniel Drake <ds...@ge...> wrote:
> Michael Williamson wrote:
>> I notice that, if I do this:
>>
>>  linux-oayh:/home/t9/src/labjack # ls -l /dev/bus/usb/003
>>  total 0
>>  crw-r--r-- 1 root root 189, 256 Nov 11 20:34 001
>>  crw-r--r-- 1 root root 189, 257 Nov 11 20:34 002
>>  linux-oayh:/home/t9/src/labjack #
>>
>> These two device files behave differently. If I try
>>
>>  # cat /dev/bus/usb/003/001
>>
>> I get short garbage output, as expected. But look,
>>
>>  # cat /dev/bus/usb/003/002
>>  cat: /dev/bus/usb/003/002: No such file or directory
>>
>> So, I guess it's not a problem with libusb-1.0.
>
> Strange, sounds like a possible udev problem. libusb could be more
> resilient against this kind of thing though, so I'll add it to the list
> of future improvements.

Well, I deleted that file, that was causing the problem. But
now I get an error -6 (in use?) in my program when attempting
to claim interface 0. Do I need to 'rmmod' some USB module
perhaps? I should also add that the 'openusb' library succeeds at
claiming interface 0, but crashes later.

...
libusb:debug [libusb_get_configuration]
libusb:debug [libusb_get_configuration] falling back to control message
libusb:debug [libusb_get_next_timeout] next timeout in 0.999886s
libusb:debug [handle_events] poll() 1 fds with timeout in 1000ms
libusb:debug [handle_events] poll() returned 1
libusb:debug [reap_for_handle] urb type=2 status=0 transferred=1
libusb:debug [handle_control_completion] handling completion status 0
libusb:debug [ctrl_transfer_cb] actual_length=1
libusb:debug [libusb_get_configuration] active config 1
got configuration
libusb:debug [libusb_claim_interface] interface 0
usb_claim_interface error -6
libusb:debug [libusb_close]
libusb:debug [usbi_remove_pollfd] remove fd 3
libusb:debug [libusb_unref_device] destroy device 3.37
libusb:debug [libusb_exit]
libusb:debug [libusb_exit] freeing default context
l


-Mike