Re: pmlogger -u questions

[Ken McDonell <kenj@xxxxxxxxxxxxxxxx>]

On 15/04/14 07:25, Frank Ch. Eigler wrote:
> Hi -
>
> On Tue, Apr 15, 2014 at 07:15:32AM +1000, Ken McDonell wrote:
>
> > [...]  Can we agree that -u semantics and no stdio should be the
> > default behaviour going forward? [...]
> That would make sense to me ...
Having actually made the change now, I like this even more ... in the 
simplest implementation it is a one line change in __pmLogNewFile() to add
    setvbuf(f, NULL, _IONBF, 0);

and then everyone who creates an archive (pmlogger, pmlogrewite, 
pmlogextract, pmlogreduce, ...) gets unconditional unbuffered I/O.
To get the logical record semantics I need a little more hackery as the 
trailer 4 bytes is currently done in a separate fwrite().  And the 
metadata writes are all fragmented, so I may need to do something 
smarter there.