From: Kay Sievers <kay.sievers@vrfy.org>
To: linux-hotplug@vger.kernel.org
Subject: Re: Accessing usb devices with USBDEVFS
Date: Mon, 01 May 2006 19:09:19 +0000 [thread overview]
Message-ID: <20060501190919.GC8038@vrfy.org> (raw)
In-Reply-To: <44525468.5030106@ist-traffic.com>
On Mon, May 01, 2006 at 03:00:17PM -0400, Danny Budik wrote:
>
> >>So is there a way then to read from the /dev/bus/usb? Like I
> >>mentioned
> >>in the parent post, I am just using fopen, and the functions
> >>provided in
> >>usbdevice_fs.h and usb.h to read data from the usb device. The
> >>device is
> >>a proprietary sensor that my company makes. Is there a
> >>manual/documentation about how to do this the more "modern" way?
> >
> >No, that's still the correct way. If you use libusb, none of your
> >code
> >changes at all. If you are using "raw" usbfs, then just open a
> >different file.
> >
> >Hope this helps,
> >
> >greg k-h
> >
> So that brings me to my next question. I guess I didn't know that
> libusb existed and wrote my own interface functions. Is it because of
> this that whenever I access the USB device, I must be root? Obviously
> that's a security issue. In other words, can I read/write to my USB
> device as a user using libusb?
That has nothing to do with the way you access the device it's not
different for libusb or a simple open(). The usual way is to change
the owner/group of the device node or add an user ACL to the
node when it appears and grant access that way to normal users.
There are several solutions out there like pam_console, resmgr, or just
putting the users in a special group.
Kay
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next prev parent reply other threads:[~2006-05-01 19:09 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-28 17:44 Accessing usb devices with USBDEVFS Danny Budik
2006-04-28 21:14 ` Greg KH
2006-04-29 13:06 ` Kay Sievers
2006-05-01 15:39 ` Danny Budik
2006-05-01 16:57 ` Greg KH
2006-05-01 19:00 ` Danny Budik
2006-05-01 19:06 ` Greg KH
2006-05-01 19:09 ` Kay Sievers [this message]
2006-05-05 20:45 ` Danny Budik
2006-05-05 21:02 ` Greg KH
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