[libvirt] PATCH: Fix build on Mingw32

[Daniel P. Berrange]

On Tue, Mar 03, 2009 at 11:38:58AM +0000, Daniel P. Berrange wrote:
> On Tue, Mar 03, 2009 at 11:18:45AM +0100, Jim Meyering wrote:
> > Daniel P. Berrange wrote:
> > > pread() and pwrite() do not exist on mingw, and the nodedevxml2xmltest
> > > was adding libvirt_driver_qemu.la for some unknown reason - probably a
> > > cut & paste error. This broke the test compile when qemu was turned off
> > > as it is on mingw32.
> > 
> > Although the new code doesn't have exactly the same semantics as
> > pread/pwrite (new code doesn't restore each file pointer to its
> > original position), it looks like no caller relied on the file
> > pointers remaining unchanged.
> 
> Yes, all the I/O is random access via the pciRead() or pciWrite()
> functions so the file pointer position is irrelvant for this usage
> 
> > On a related note, don't these need EAGAIN handling?
> > Maybe EINTR, too.
> 
> I queried whether this should ue saferead/write when the patches 
> were first reviewed, but Mark said it was not neccessary for use
> of sysfs and this code will be replaced by libpciaccess.so in the
> not too distant future

Of course now I changed pread to read(), the make syntax-check complains,
so I went all the way to saferead() and safewrite() here

Daniel
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