On Wed, 17 Aug 2016 10:58:09 +0300
Oskari Saarenmaa <o...@ohmu.fi> wrote:

> The attached patch replaces FileWrite and FileRead with FileWriteAt
> and FileReadAt and removes most FileSeek calls.  FileSeek is still
> around so we can find the end of a file, but it's not used for
> anything else.

It seems that configure test for availability of pread/pwrite functions
and corresponding #define is needed.
I don't think that all platforms, supported by PostgreSQL support this
API. Especially, I cannot find any mention of pread/pwrite in the Win32 
except this thread on stackoverflow:


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