Re: file changes content but ContentModificationDate not changing
Re: file changes content but ContentModificationDate not changing
- Subject: Re: file changes content but ContentModificationDate not changing
- From: "Gerriet M. Denkmann" <email@hidden>
- Date: Thu, 06 Nov 2014 17:37:14 +0700
> On 6 Nov 2014, at 16:23, Quinn The Eskimo! <email@hidden> wrote:
>
> On 6 Nov 2014, at 04:20, Gerriet M. Denkmann <email@hidden> wrote:
>
>> Following your advice I found a way to change a file without DISPATCH_SOURCE_TYPE_VNODE noticing it (same way save_drift_file() in ntp_util.c does it):
>
> As to whether it /should/ be this way, I'm not really qualified to say--given the way memory mapping works, it might be quite hard to change this behaviour--but, regardless, if the current behaviour is causing you problems, you should file a bug about it.
Not really a problem. This was just a sidetrack.
> Realistically though, it might be better asking for a dedicated notification for the drift change rather than trying to do this through the file system.
What I am currently doing is: polling by sending a packet to ntpd (same as ntpq does), asking for the current frequency.
This is probably efficient enough.
Getting a notification whenever the frequency changes would be nice, but how?
NSDistributedNotificationCenter? "Posting a distributed notification is an expensive operation."
Registering a block with ntpd to be executed in this case? (Looks dangerous, as ntpd runs as root).
Some other method?
Anyway, thanks a lot for your help! - I understand DISPATCH_SOURCE_TYPE_VNODE much better now.
Kind regards,
Gerriet.
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