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<TITLE>sane-devel: Re: Creating /dev/scanner</TITLE>
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<META NAME="Author" CONTENT="Douglas Gilbert (dgilbert@interlog.com)">
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<META NAME="Subject" CONTENT="Re: Creating /dev/scanner">
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<H1>Re: Creating /dev/scanner</H1>
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<STRONG>From:</STRONG> Douglas Gilbert (<A HREF="mailto:dgilbert@interlog.com?Subject=Re:%20Creating%20/dev/scanner&In-Reply-To=<39B85A49.3B3A5568@interlog.com>"><EM>dgilbert@interlog.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Thu Sep 07 2000 - 20:17:29 PDT
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0073.html">M. Peck Dickens: "Re: Creating /dev/scanner"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0071.html">mh: "Re: SANE Api question: SANE_INFO_RELOAD_OPTIONS"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0063.html">Randolph Bentson: "Re: Creating /dev/scanner"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0073.html">M. Peck Dickens: "Re: Creating /dev/scanner"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0073.html">M. Peck Dickens: "Re: Creating /dev/scanner"</A>
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<P>
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Randolph Bentson wrote:
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<BR>
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<EM>>
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</EM><BR>
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<EM>> On Fri, Sep 08, 2000 at 01:58:54AM -0400, M. Peck Dickens wrote:
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</EM><BR>
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<EM>> > Hi there,
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > OK, I've recieved my Fujitsu 600c and it works great under SANE!. Now, I want to
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</EM><BR>
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<EM>> > create /dev/scanner and soft link it to /dev/sgd. My question is how do I do
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</EM><BR>
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<EM>> > this properly and then give /dev/scanner the correct permissions so I can
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</EM><BR>
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<EM>> > use SANE as joe user instead of as root and still have security in place?
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> That's good news.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> You cannot use permissions on "/dev/scanner" to open access.
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</EM><BR>
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<P>Not if it's a symbolic link. However you could use mknod
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<BR>
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to make it point to the same device as /dev/sgd :
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<BR>
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mknod /dev/scanner c 21 3
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<BR>
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<P>and then set the permissions on it. Hopefully this wouldn't
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<BR>
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confuse SANE. Probably not a smart idea though.
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<BR>
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<P><EM>> Provided you've got a stable hardware environment, i.e., one
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</EM><BR>
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<EM>> which doesn't have SCSI devices added and removed on a whim,
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</EM><BR>
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<EM>> you can add a group "sane_oper", add whomever you want to that
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</EM><BR>
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<EM>> group, "chmod 660 /dev/sgd" and "chgrp sane_oper /dev/sgd".
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> At least that's what I do.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> If you have SCSI devices added and removed, the device used to
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</EM><BR>
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<EM>> access the scanner will change. You'll have to change which
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</EM><BR>
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<EM>> device has the appropriate permissions. I believe the device
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</EM><BR>
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<EM>> filesystem in 2.4 kernel will address this problem.
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</EM><BR>
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<P>There is also a user space utility called scsidev that could be
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<BR>
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useful in this regard (and it works on all versions of Linux). It
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<BR>
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allows aliases such as /dev/scanner to be created pointing at the
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<BR>
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(sg) device that matches a given set of parameters. For example,
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<BR>
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if you knew that your scanner has scsi id=5 then the following
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<BR>
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could be placed in the file /etc/scsi.alias :
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<BR>
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id=5, devtype=generic, alias=scanner
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<BR>
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<P>See <A HREF="http://www.garloff.de/kurt/linux/scsidev">http://www.garloff.de/kurt/linux/scsidev</A>
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<BR>
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What I have described above is documented in its manpage.
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<BR>
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<P><P>Doug Gilbert
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<BR>
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<P><PRE>
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--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20Creating%20/dev/scanner&In-Reply-To=<39B85A49.3B3A5568@interlog.com>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0073.html">M. Peck Dickens: "Re: Creating /dev/scanner"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0071.html">mh: "Re: SANE Api question: SANE_INFO_RELOAD_OPTIONS"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0063.html">Randolph Bentson: "Re: Creating /dev/scanner"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0073.html">M. Peck Dickens: "Re: Creating /dev/scanner"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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