[BRLTTY] gettimeofday

[Dave Mielke]

[quoted lines by Vladimir 'φ-coder/phcoder' Serbinenko on 2012/06/18 at 14:39 +0200]

>Previously it was discussed how to make an equivalent of gettimeofday to
>work on GRUB. 

Yes. You may wish to check timing:getCurrentTime() to see if we got it right 
for grub.

>Now, I've realized that the current code using gettimeofday is wrong since the 
>date gives no guaranty of being monotonic, and especially it isn't if someone 
>runs "date" or "ntpdate" which is common operation, especially on systems 
>where the RTC battery is failing. 

And during daylight saving time switches. :-)

>brltty should use time/gettimeofday only for timestamping logs and 
>CLOCK_MONOTONIC (probably with some wrapper to make other monotonic clock 
>sources easy to add) for all timing and timeout purposes. 

Yes, thanks, for timeouts that's an excellent point. I doubt CLOCK_MONOTONIC 
existed way back whenever, but, yes, we really should fix this. We can always 
code the current method as a fallback for builds on old systems.

What should we be using within the Grub environment for this?

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