Re: [Linux-gpib-general] GPIB libs on 64-Bit machine

[Martin O. <mar...@de...>]

Ups. So it should work also on a 64-Bit machine. (Thanks :) ) And I'm 
sorry. I don't want to bother someone. I only want to understand what I am 
doing wrong.

Then the question stays: When I installed (i.e. configured, maked, make 
installed) the library without problems, when all hotplug-stuff and 
ld.so.conf and permissions are set correctly, when hardware is ok -> what 
could be the reason for the error message on 'ibtest':
trying to open board named 'gpib-usb-hs'
libgpib: IBOPENDEV ioctl failed
libgpib: ibfind failed to get descriptor
failed to open board
?

I get the same message when I boot up my 32-Bit and try 'ibtest'. I have to 
replug the gpib-usb-hs first before it is accessible. Did I forget 
something concerning permission settings?? usb-hotplugging and /dev/gpib* 
are set. Kernel modules are running - also directly after the booting.

But at least after replugging I get it running on the 32-Bit machine. This 
is unfortunatelly not the case for the 64-Bit system. And as I wrote 
before: I did exectly the same steps on both systems - which are both 
Scientific Linux 4 distributions. The only (really only) difference is 
that one system is 32-Bit the other 64-Bit. I've not idea about the 
differences of the system interna - but as you confirmed this shouldn't be 
an issue.

I just don't understand it.

Cheers,
Martin



On Wed, 28 Nov 2007, John Ackermann N8UR wrote:

> For what it's worth, I built the current gpib stuff (from sourceforge)
> on an AMD 64 bit machine, and at least for the limited application I
> used (screen dumps from an HP 8566 spec an, using an NI GPIB-PCI card),
> it all worked.
>
> John
> ----
>
> Martin Ohlerich wrote:
>> Hello Frank,
>>
>> thanks for this fast answer. However I'm not sure whether I understand it.
>> I was compiling the gpib-library on the 64-Bit machine. This was without
>> any problem. Why there should be afterwards trouble?
>> Of cource, calls from 32-Bit programm into 64-bit libraries won't work.
>> This is the reason why I cannot use labview with these gpib-libraries.
>> (labview=32-Bit application, gpib=64-Bit library)
>>
>> But if I compiled gpiblib on the 64-machine and hence have a 64-Bit
>> gpib library then I should be able to access the gpib boards or devices
>> via the 'ibtest' test programm. Or do I see this wrong?
>> If there is no compalibility in the ioctl structs between 32 and 64 Bit
>> why does the compiler not complaint?
>>
>> Cheers,
>> Martin
>>
>>
>> On Tue, 27 Nov 2007, Frank Mori Hess wrote:
>>
>>> On Tuesday 27 November 2007 12:39, Martin Ohlerich wrote:
>>>> Hello all,
>>>>
>>>> I want to write gpib-DAQ software for a Keithley, which is accessed via
>>>> gpib-usb-hs from National Instruments. For this I took the gpib-library
>>>> from sourceforge : linux-gpib-3.2.09. The OS of my PC is Scientific
>>>> Linux 4. I successfully installed libgpib on a 32-Bit machine.
>>>> When I did the same steps on a 64-Bit machine I failed. The installation
>>>> itself worked without problems. Also the modules are loaded (I checked
>>>> this with help of lsmod). All permissions are set correctly (I even
>>>> tried as root). By 'cat /proc/bus/usb/devices' I saw that the
>>>> gpib-usb-hs was detected correctly. So everything looks fine.
>>>>
>>>> The result on the 64-Bit machine is, however, when starting 'ibtest' and
>>> calls from a 32 bit libgpib user space library into a 64 bit kernel won't
>>> work, as the ioctl structs are not 32/64 bit agnostic, and the gpib kernel
>>> driver doesn't implement compat_ioctl.
>>>
>>> --
>>> Frank
>>>
>>>
>>
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