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From: Michael Ellerman <mpe@ellerman.id.au>
To: Harshal Patil <harshal.patil@in.ibm.com>, linuxppc-dev@lists.ozlabs.org
Cc: Sudipto Ghosh <sudiptoghosh@in.ibm.com>
Subject: Re: ioctl structs differ from x86_64?
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Date: Thu, 16 Mar 2017 21:49:12 +1100
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Harshal Patil <harshal.patil@in.ibm.com> writes:

> Hello,
> I am looking into a bug, https://bugzilla.linux.ibm.com/show_bug.cgi?id=152493
> ( external mirror is at, https://github.com/opencontainers/runc/issues/1364) 
> Recently in runc code, they added this code
> https://github.com/opencontainers/runc/commit/eea28f480db435dbef4a275de9776b9934818b8c#diff-5f5c07d0cab3ce2086437d3d43c0d25fR155.
> As you can see they set -onlcr to get rid of \r (line no. 164). Golang, in which
> runc is written, doesn't have any bindings for ioctls. This means you have to
> invoke C code directly (that's what they are doing there).
> Our guess is the ioctls in ppc64le differ than x86_64, and thats why the code
> which is clearing onclr bit
> (https://github.com/opencontainers/runc/commit/eea28f480db435dbef4a275de9776b9934818b8c#diff-5f5c07d0cab3ce2086437d3d43c0d25fR164)
> is failing on ppc64le but works fine on x86_64. 

I think you've probably got enough replies, but the short answer is
"yes", IOCTL numbers do differ across architectures - including
potentially between 32-bit and 64-bit.

cheers