From: Charles Mills <cmills@...>
Date: 2005-06-23T05:05:43+09:00
Subject: Re: How I can find out on which platform I am running (32/64 bits)?

Daniel Berger wrote:
> WATANABE Hirofumi wrote:
> > Hi,
> >
> > "Joachim Just" <joachim.just@onlinehome.de> writes:
> >
> >
> >>I wonder whether within ruby there is a method to find out on which
> >>platform my application is running.
> >>
> >>Unfortunately, the application has to know if it is a 32-bit or 64-bit
> >>system.
> >>
> >>Any hints are highly appreciated.
> >
> >
> >
> > 64-bit % ruby -ve 'p [0].pack("l!").size'
> > ruby 1.9.0 (2005-05-31) [x86_64-netbsd]
> > 8
> >
> > 32-bit % ruby -ve 'p [0].pack("l!").size'
> > ruby 1.9.0 (2005-06-13) [i386-linux]
> > 4
>
> That doesn't tell me much on Solaris:
>
>  >ruby -ve 'p [0].pack("l!").size'
> ruby 1.8.2 (2004-12-25) [sparc-solaris2.10]
>
> Ara's approach should work fine, though.
>
> Finding the bitness of Ruby itself is easy.  Finding a cross platform
> way to find the bitness of the OS itself is another matter.  I'm not
> sure what the OP is after.
>
> If anyone knows of a good, cross-platform way of finding the bitness of
> the OS itself, I'd like to know that myself. :)
>
> Regards,
>
> Dan

irb(main):001:0> [1].pack('L')
=> "\001\000\000\000"
irb(main):002:0> [0x01020304].pack('L')
=> "\004\003\002\001"

So I'm on a little endian machine.

-Charlie