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Re: Controlling buffer alignment in file.read()

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  Re: Controlling buffer alignment in file.read() Dan Stromberg <drsalists@gmail.com> - 2014-03-18 18:01 -0700

#68528 — Re: Controlling buffer alignment in file.read()

On Tue, Mar 18, 2014 at 1:23 PM, Haralanov, Mitko
<mitko.haralanov@intel.com> wrote:
> Hi all,
>
> I am using Python to read from a binary device file which requires that all read sizes are in 8byte multiples and the user's buffer is 8byte aligned.
>
> I am currently using a file object and the file.read() method. However, the issue is that the file.read() method allocates the buffer passed to C function under the covers and, therefore, the alignment is arbitrary.
>
> Is there a way that I can get file.read() to use an 8byte aligned buffer?

This is a lot like what my odirect project does:
http://stromberg.dnsalias.org/~strombrg/odirect/

It does buffer alignment, because O_DIRECT requires buffer alignment.
It's a Python-callable SWIG wrapper for some C code.

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