Re: [Denemo-devel] Help with File modification time???

[Josue Abarca]

On Thu, Sep 27, 2012 at 09:37:59AM +0100, Richard Shann wrote:
> On Wed, 2012-09-26 at 14:56 -0600, Josue Abarca wrote:
> > On Wed, Sep 26, 2012 at 06:46:16PM +0100, Richard Shann wrote:
...
> > st_mtim.tv_nsec <- to see the nano seconds.
> > 
> > (of course the file system must support nanoseconds time stamps)
> Thanks - it seems I have been on the right track - I was looking at
> tv_nsec in the debugger and it is always 0. IIRC Debian stable uses ext2
> filesystem - could it be that it doesn't record nano-second
> timestamps?

Ext2 does not support, nano-second timestamps :(.

Debian stable (squeeze) uses ext3 by default, but AFAIK time
nano-second timestamps were introduced in ext4 [0].

Debian stable also supports ext4, but you need to select the option in
the partitioning step (I always choose ext4 :P).

> Even if it didn't have the precision to give accurate information it
> could always increment tv_nsec by 1 every time it modified a file with
> the same value of tv_sec. 
> If this is really the situation I guess I should find another way - I
> need to do something for the Windows system anyway as that doesn't do
> file locking the same way as unix. So I will maybe need to keep changing
> the filename that LilyPond stores to, though it is nice to keep the old
> one for viewing...
> 
> Richard

Maybe inotify could be used, but this would be only for GNU/Linux, so
I guess that maybe changing the file name is a better approach.

[0] http://en.wikipedia.org/wiki/Ext4
[1] https://www.ibm.com/developerworks/linux/library/l-inotify/

-- 
Josué M. Abarca S.
Vos mereces Software Libre.
PGP key 4096R/70D8FB2A 2009-06-17
Huella de clave = B3ED 4984 F65A 9AE0 6511  DAF4 756B EB4B 70D8 FB2A