Re: Q: device(file) permissions for USB

Jonathan Hudson (jonathan@daria.co.uk)
Thu, 06 Dec 2001 20:14:47 GMT


In article <fa.ljcupnv.1ghotjk@ifi.uio.no>,
kees <kees@schoen.nl> writes:
k> This message is in MIME format. The first part should be readable text,
k> while the remaining parts are likely unreadable without MIME-aware tools.
k> Send mail to mime@docserver.cac.washington.edu for more info.
k>
k> ---1463801846-915869288-1007668919=:13843
k> Content-Type: TEXT/PLAIN; charset=US-ASCII
k>
k> Hi,
k>
k> I have been playing with an USB camera. I've run into the following
k> problem:
k> The (default?) permissions for /proc/bus/usb/001/011 (and others) are
k> 0644. This makes the ioctl (see attached trace to fail). So I have to:
k> either chmod the usb device file each time I unplug and replug the camera
k> OR make the pencam program SUID root, which is neither comfortable.
k> Is there a way to affect the default permissions for the USB devices?

Use hotplug to run a script to change the permissions when the device
is connected. Mail me off list for an example.
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