[sane-devel] Problem with network scanning Linux/win98

[Henning Meier-Geinitz]

Hi,

On Mon, May 06, 2002 at 06:18:20PM +0200, Edvard Rognlid wrote:
> The newst rpm for redhat 7.2 I could find vas for version 1.0.5-4.

I don't know if you can just use the RPMs of other distributions (e.g.
Mandrake) from http://www.mostang.com/sane/source.html . Maybe someone
with knowledge about RedHat can comment on this.

> And 
> since I'm a newbee to Linux I don't know how to install for other type of 
> files than RPM's. Thats the reason I use 1.0.5-4. Can you give me som 
> instructions on how to intall 1.0.7?

There should be some information about compiling and installing
software that's not in .tar.gz format in the documentation of your
distribution. Basicly, unpack sane-backends-1.0.7.tar.gz e.g. in /tmp,
and read the README file.

> >Nothing like the above mentioned lines about "saned"? Then saned isn't
> >running (or segfaults right after the start).
> When trying xsane for win98 when xinetd is runing I get this in 
> var/messages:
> May  6 17:54:29 barcelona saned[4168]: access by edvard@radich accepted
> May  6 17:54:30 barcelona saned[4168]: exiting

Looks ok in principle. However, I wonder why the modprobe message from
below doesn't occur here.

> When trying xsane using saned -d5 I get this in var/messages:
> May  6 18:02:01 barcelona saned[4194]: access by edvard@radich accepted
> May  6 18:02:01 barcelona modprobe: modprobe: Can't locate module 
> char-major-81

char-major-81 is video for linux, that's ok. You can disable v4l in
/etc/sane.d/dll.conf if you like to stop this message.

> May  6 18:02:01 barcelona last message repeated 3 times
> May  6 18:02:14 barcelona saned[4194]: exiting
 
> 
> >Try running
> >
> >SANE_DEBUG_NET=255 scanimage -L
> >
> >This should print some info about what the net backend is doing.
> 
> Just:
> [root@barcelona log]# SANE_DEBUG_NET=255 scanimage -L
> device `microtek:/dev/sge' is a Microtek ScanMaker E3 flatbed scanner
> device `microtek:/dev/sg4' is a Microtek ScanMaker E3 flatbed scanner
> [root@barcelona log]#

Something is badly wrong here. Maybe RedHat has disabled debug messages?
You should get something like this:

[sanei_debug] Setting debug level of net to 255.
[net] sane_init: SANE net backend version 1.0.3 from sane-backends-1.0.5
[net] add_device: adding backend localhost
[net] add_device: backend localhost added
[net] sane_get_devices: local_only = 0
[net] sane_get_devices: finished

Does "SANE_DEBUG_DLL=255 scanimage -L" print something useful? If it
doesn't, RedHat has modified the SANE package. In this case, I can't
help you with this package, you should ask RedHat instead.
 
> At http://www.penguin-breeder.org/Penguin-Breedersane.htm I found the 
> folowing:
> "Sometimes, saned starts only when debugging is enabled. To be able to use 
> saned with debugging enabled from inetd or xinetd, you have to use a little 
> wrapper.

That's a dirty trick to avoid one of the bugs mentioned by me. Even if
you are hit by this bug, this work-around may not work. It just
changes the timing.

> This is also handy, if you need debug output from the backend and 
> you don't want to start saned by hand all the time... rename saned to 
> something like saned.bin and create a shell script like this
> #!/bin/sh
> SANE_DEBUG_MUSTEK=128
> export SANE_DEBUG_MUSTEK

You should use MICROTEK instead of MUSTEK here.

> cd /tmp
> exec $0.bin 2> saned.$$.stderr | tee saned.$$.stdout

If I remember correctly, this didn't work for me. I simply used
something like

/usr/sbin/saned.bin 2>/tmp/saned.err

> This will make two files with stdout and stderr from the last session in 
> /tmp. The debug information will be in saned.*.stderr. "
> 
> This might my problem, or? If thats the case maby a new version will help.

I'm pretty sure that a new version will fix your problem.

Bye,
  Henning