[sane-devel] Permissions problem with Epson 1640 & Solaris

[Karl Heinz Kremer]

Henning is right, the EPSON backend does not fork off a reader process.
That the root user can scan is a sure sign that there is something
wrong with the permissions. From your directory listing it looks
like the scanimage process should do a set group ID to the "scanner"
group, which does have read and write access to the device. 

Are you sure that the user that is running this program is a member
of this group? 

Karl Heinz


On Wed, Mar 27, 2002 at 06:37:30PM +0100, Henning Meier-Geinitz wrote:
> Hi,
> 
> On Wed, Mar 27, 2002 at 01:54:47PM +0100, Johan Bengtsson wrote:
> > gorthaur:elijah 13:48 ~ > scanimage -L
> > device `epson:/dev/scsi/processor/c1t5d0' is a Epson Perfection1640 flatbed scanner
> 
> This means that access to the device is possible (inquiry was sent).
> 
> > gorthaur:elijah 13:40 ~ > ls -laL /dev/scsi/processor/c1t5d0 
> > crw-rw----   1 root     scanner  151,   5 Mar 27 12:14  /dev/scsi/processor/c1t5d0
> > 
> > gorthaur:elijah 13:48 ~ > ls -laL /opt/pd/bin/scanimage
> > -rwxr-sr-x   1 root     scanner    119412 Mar  5 12:01 /opt/pd/bin/scanimage
> > 
> > gorthaur:elijah 13:40 ~ > /opt/pd/bin/scanimage -d epson:/dev/scsi/processor/c1t5d0
> > scanimage: sane_start: Error during device I/O
> 
> Bye the way, this would output the image data on stdout.
> 
> > It works to scan as root. We have an Umax scanner that is set up with
> > exactly the config (not the same backend of course...) that works like it
> > should....
> 
> My dirst idea was that the epson backend uses fork() for the reader
> process and may lose its sgid permission and umax doesn't use fork().
> However, from a quick grep it looks like it's the other way round.
> 
> Anyway you could try to add your user to group scanner to check if
> that's the problem.
> 
> I'm a bit surprised that an IO error occurs and not an "access denied".
> You could try something like:
> 
> SANE_DEBUG_EPSON=255 scanimage -d epson:/dev/scsi/processor/c1t5d0 >pnm.out
> 
> to find out where exactly the error occurs. If you think it's related
> to the SCSI system you can also set SANE_DEBUG_SANEI_SCSI=255.
> 
> Bye,
>   Henning
> _______________________________________________
> Sane-devel mailing list
> Sane-devel at www.mostang.com
> http://www.mostang.com/mailman/listinfo/sane-devel

-- 
Karl Heinz Kremer                                  khk at khk.net
PGP Key at                 http://www.khk.net/download/khk.asc
EPSON Sane Backend:                         http://www.khk.net
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 232 bytes
Desc: not available
URL: <http://alioth-lists.debian.net/pipermail/sane-devel/attachments/20020327/8ed3a52a/attachment.sig>