Paul Eggert <egg...@cs.ucla.edu> writes: > [For those cc'ed, the thread's at <https://bugs.gnu.org/64937#142>.] > > On 2023-08-09 07:29, Bruno Haible wrote: > >> And on Alpine Linux, while /var/run/utmp is empty, its time stamp is >> essentially the boot time. >> The approach used by Emacs, namely to look at the time stamp of >> /var/run/random-seed, is therefore essentially one of the best >> approaches. >> It just needs to also look at /var/lib/systemd/random-seed and - on >> Alpine >> Linux - /var/run/utmp . > > Thanks for looking into this. Clearly Emacs had some catching up to > do, since it was using a location for the random-seed file that > current GNU/Linux distros no longer use. To try to fix this I > installed the attached patch to Emacs master on Savannah. > > This patch does not address the problem for Alpine, nor I suspect for > Android. I suppose Alpine could use the timestamp of /var/run/utmp (or > is that /run/utmp?) but I don't know how 'configure' would reliably > detect it's being built or cross-built for Alpine. I'll cc this to > Natanael Copa, who does the Alpine ports for Emacs, to see whether he > can give advice. > > Also, I don't know how Android records boot time so I'll cc this to Po > Lu, the main developer for Emacs on Android.
The boot time is off limits to user programs on Android, for security reasons. It should suffice to undefine BOOT_TIME_FILE there.
