bug#64937: boot time on Linux

[Bruno Haible]

I wrote:
> > No, it isn't. The attached file, when compiled and run under Termux (which
> > doesn't have particular permissions), prints e.g.:
> >
> > from clock  : 1691616762.476870660 = 2023-08-09 21:32:42.476870660
> > from sysinfo: 1691616762.329261637 = 2023-08-09 21:32:42.329261637
> >
> > Note that this uses the kernel's uptime counter, so it will not work well
> > when the user changes the current time manually. But this is rare on 
> > Android.

It works well enough, that I'm adding it to Gnulib, through the attached patch.

Po Lu wrote:
> This uses the uptime counter (which also results in an SELinux denial
> for me, but different Android distributions have SELinux policies of
> varying strictness)

How did you run the program, and which of the two calls (clock_gettime, sysinfo)
failed for you? Maybe it depends not only on the Android version and device,
but also on the permissions required by the app?

Bruno

0001-readutmp-Return-a-boot-time-also-on-Android.patch
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