On Mar 26, 2020, at 3:36 AM, Zhang Qian（张倩） <[email protected]> wrote:
>
> If user modifies the system time for device, seems it will impact A/V sync
> for client. How can I avoid this problem?
Have your user switch to calling adjtimex(2) instead:
http://man7.org/linux/man-pages/man2/adjtimex.2.html
Yes, it’s more complicated than doing a blind settimeofday(2) or similar, but
it’s more complicated specifically in order to deal with problems like the one
you bring up.
Better, stop allowing direct time edits and set up a proper NTP client. Most
of them will use adjtimex(2) or similar APIs unless you configure them not to.
There are a few “simple” NTP clients that do single-step time adjustment; avoid
them in this case.
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