Yes, devtmpfs. Linux Kernel is 2.6.32-358 (RHEL6).
Regards,
Chris
On Wed, Jun 26, 2013 at 8:23 AM, Hans de Goede <hdego...@redhat.com> wrote:
> Hi,
>
>
> On 06/25/2013 11:27 PM, Chris Dickens wrote:
>
>> Hi,
>>
>> I have discovered that the libusb process's file mask affects how
>> libusb_attach_kernel_driver() restores the driver. In my particular case, I
>> am dealing with usblp, so the kernel enumerates /dev/usb/lpX device files.
>> The /dev/usb folder is created and destroyed as necessary for the devices.
>>
>> When there is a single usblp device, the libusb_detach_kernel_driver()
>> will cause the folder to be removed. Upon reattaching the kernel driver,
>> the folder is restored, and the permissions are dictated by the process's
>> file mask. To clarify, the individual device files are not affected by the
>> umask; those permissions follow the udev rules. The permissions of the
>> folder containing the device files are affected.
>>
>> I was very surprised to see this behavior. I don't necessarily want my
>> application to set its own umask to deal with this issue.
>>
>> Does anyone have suggestions?
>>
>
> Sounds like a kernel bug to me. I guess you're using devtmpfs
> on /dev ?
>
> Regards,
>
> Hans
>
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