[linux-lvm] Writing forward compatible applications using /proc
Heinz J . Mauelshagen
mauelshagen at sistina.com
Tue Aug 14 13:36:24 UTC 2001
On Tue, Aug 14, 2001 at 01:49:51AM +0200, Ragnar Kjørstad wrote:
> On Mon, Aug 13, 2001 at 10:08:58AM +0100, Joe Thornber wrote:
> > > Why will liblvm disappear? To me using a library interface seems much
> > > nicer than wrapping applications.
> >
> > Because it's means there's yet another interface (along with the
> > command line tools, and ioctl's) to constrain any implementation
> > changes. Command line tool interface will not change. liblvm (if it
> > still existed as a shared library) will change drastically between 1.0
> > and 2.0 - not least because it in turn reflects the driver ioctl
> > interface.
>
> I'm not complaining if it's changing, but if it's going away, that's bad
> :(
>
> > The experimental branch has a single lvm tool, with liblvm statically
> > linked into it. There's no need for the outside world to know about
> > liblvm.
> >
> > It may be a good idea for Sistina to produce a tiny 'wrap the tools'
> > library for use by gui implementors.
>
> yach! An uncomplete list of uglyness:
> * Errorhandling
Not much of a difference to the existing library error handling anyway.
> * fork/exec
Well, that's what the UNIX tool box is all about.
No mass fork/execs necessary.
> * having to format input arguments as strings (and quote them)
printf doesn't seem to hard to use ;-)
> * having to parse output data from strings
No big deal with for eg. perl.
>
>
> --
> Ragnar Kjorstad
> Big Storage
> _______________________________________________
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> linux-lvm at sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
--
Regards,
Heinz -- The LVM Guy --
*** Software bugs are stupid.
Nevertheless it needs not so stupid people to solve them ***
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Heinz Mauelshagen Sistina Software Inc.
Senior Consultant/Developer Am Sonnenhang 11
56242 Marienrachdorf
Germany
Mauelshagen at Sistina.com +49 2626 141200
FAX 924446
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