RE: [Linux-ia64] platform detection at run-time

[Sane_Purushottam@emc.com]

The reason, I have to detect the architecture at run time has to do with the
interface with (sg) driver. Since the driver is natively compiled for
64-bit, it expects the data structure handed over to it, to be 64-bit wide.
Thus my 32-bit application cannot issue ioctl calls successfully.

So, in my application, based on the platform, I fill the appropriate
structure before ioctl call.

Nitin Sane
sane_purushottam@emc.com
(508) 382-7319


-----Original Message-----
From: Van Maren, Kevin [mailto:kevin.vanmaren@unisys.com]
Sent: Wednesday, September 25, 2002 3:28 PM
To: 'Sane_Purushottam@emc.com '; 'linux-ia64@linuxia64.org '
Subject: RE: [Linux-ia64] platform detection at run-time


Nitin,

Have you decided what you want to do about AMD's x86-64?
That is another 64-bit platform that will run your 32-bit binary.

Ideally all three platforms would be enough alike you don't
have to worry about it: is there a problem with Linux that is
causing you to perform this check?

Kevin

-----Original Message-----
From: Sane_Purushottam@emc.com
To: linux-ia64@linuxia64.org
Cc: Sane_Purushottam@emc.com
Sent: 9/25/02 2:18 PM
Subject: [Linux-ia64] platform detection at run-time

I have a linux application running on 32-bit machines. Due to some
third-party limitations, we cannot build this application on 64-bit
machines
natively. Thus we'll be using the '32-bit compatibility mode'.

For some application specific reasons, I need to be able to determine at
run-time whether the application is running on a 32-bit or a 64-bit
platform.

What I have found is that there's no reliable way for the application to
determine whether it's running on a 64-bit machine. I use info obtained
from
/proc/cpuinfo (more specifically family field) to determine the
platform.
However this is not standard. On Redhat 7.1 (lk 2.4.3-12) family value
is
set to IA-64 while on Redhat 7.2 (lk 2.4.9-34) this field is set to
'Itanium'.

What is the preferred method to determine the platform at run time ??
Are
these values likely to change (after I change my code to handle this)
????

Nitin Sane
sane_purushottam@emc.com
(508) 382-7319


_______________________________________________
Linux-IA64 mailing list
Linux-IA64@linuxia64.org
http://lists.linuxia64.org/lists/listinfo/linux-ia64