Re: [RFC PATCH Mach] Add a mach host operation which returns elapsed time since bootup

[Zhaoming Luo]

On 12/19/24 6:31 PM, Samuel Thibault wrote:
> Zhaoming Luo, le jeu. 19 déc. 2024 09:23:57 +0800, a ecrit:
> > On 12/19/24 4:18 AM, Luca wrote:
> > To be honest I came across /dev/time several times but I'm still quite
> > confused about it. I tried to read the documentation and the code of storeio
> > translator (`showtrans /dev/time` gave me /hurd/storeio ...) but I didn't
> > find something useful. May I have a detail explanation about the "time"
> > device? (purpose and mechanism). Or any documentation that's worth to read?
>
> See mach's device table i386/i386at/conf.c, which leads to timemmap(),
> which maps mtime from mach_clock.c. It could be useful to extend it too.
Do you have any idea about the meaning of 'uncorrected' in [0]? And 
strictly speaking, `time` can be modified using `host_set_time64` [1], 
maybe we can have a comment better than 'time since bootup'.

[0]:https://git.savannah.gnu.org/cgit/hurd/gnumach.git/tree/kern 
mach_clock.c#n71
[1]: 
https://git.savannah.gnu.org/cgit/hurd/gnumach.git/tree/kern/mach_clock.c#n467
--
Zhaoming Luo