sane-project-website/old-archive/2001-04/0022.html

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<TITLE>sane-devel: Re: sm3600 SANE backend in the beam</TITLE>
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<H1>Re: sm3600 SANE backend in the beam</H1>
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<STRONG>From:</STRONG> Oliver Neukum (<A HREF="mailto:Oliver.Neukum@lrz.uni-muenchen.de?Subject=Re:%20sm3600%20SANE%20backend%20in%20the%20beam&In-Reply-To=&lt;01040407043001.01575@idun&gt;"><EM>Oliver.Neukum@lrz.uni-muenchen.de</EM></A>)<BR>
<STRONG>Date:</STRONG> Tue Apr 03 2001 - 22:04:30 PDT
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Am Dienstag 03 April 2001 20:42 schrieben Sie:
<BR>
<EM>&gt; On Tuesday 03 April 2001 16:25, you wrote:
</EM><BR>
<EM>&gt; &gt; &gt; This is a general problem.
</EM><BR>
<EM>&gt; &gt; &gt; You can either live with it and use saned over TCP/IP loopback, which
</EM><BR>
<EM>&gt; &gt; &gt; I wouldn't recommend.
</EM><BR>
<EM>&gt; &gt; &gt; Or you change the permissions and ownership on the usbdevfs entry.
</EM><BR>
<EM>&gt; &gt; &gt; Or write a small kernel module.
</EM><BR>
<EM>&gt;
</EM><BR>
<EM>&gt; Check out <A HREF="http://www.xena.uklinux.net/Linux/usb_perms.html">http://www.xena.uklinux.net/Linux/usb_perms.html</A> for a quick and
</EM><BR>
<EM>&gt; dirty daemon to fix the file permissions. I think that under 2.4, the
</EM><BR>
<EM>&gt; hotplug capability will provide similar functionality.
</EM><BR>
<P>Hi,
<BR>
<P>this shows an admirable spirit, but the approach has an inherent race
<BR>
condition. You cannot know whether the device nodes whose permissions you set
<BR>
are still the correct ones. The risk, however, is small.
<BR>
<P>Hotplug should somewhen in the future provide this functionality. At present
<BR>
it has race conditions similar to those mentioned above.
<BR>
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Regards
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Oliver Neukum
<BR>
<P><PRE>
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