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

[John A. N. <jr...@fe...>]

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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