systems without pread?

Green, Paul Paul.Green at
Tue Dec 16 02:48:47 GMT 2003

James Peach [mailto:jpeach at] writes:
> I have been testing a patch which adds pread/pwrite oerations 
> to the Samba VFS layer and makes exclusive use of them in the 
> file I/O path. The current version emulates p{read,write} 
> using lseek/lseek/{read,write}/lseek if they are absent. So 
> while it is a big performance win for the lucky platforms 
> _with_ those APIs, it does introduce suckage for those without.


> So, are there any systems that Samba runs on without 
> p{read,write}, and should I propagate my #ifdef-age to 
> restore the original behaviour for these?

Yes.  These are new in POSIX-2001; they are not present in POSIX-96.  Some
of us are still on POSIX-96.

Paul Green, Senior Technical Consultant,
Stratus Technologies, Maynard, MA USA
Voice: +1 978-461-7557; FAX: +1 978-461-3610

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