bug#64937: boot time on Linux

More info about this problem: I wrote > I have a VM running in VirtualBox, that I booted 6 days ago, then "saved" > it (i.e. all the state gets frozen) and resumed it today around 20:30 UTC. > ... > So, both programs show a "boot time" that is just 5 hours ago, at a moment > when > the VM was in f

bug#64937: boot time on Linux

[For those cc'ed, the thread's at .] 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

bug#64937: boot time on Linux

I wrote: > So, all approaches that compute the boot time through a subtraction are > going to be wrong in these scenarios. > > The better approach is really to read the boot time from a time stamp — > inside a file such as /var/run/utmp or /var/log/wtmp, or attached to > a file such as > /var/li

bug#64937: boot time on Linux

Paul Eggert wrote: > 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 t

bug#64937: boot time on Linux

Paul Eggert writes: > [For those cc'ed, the thread's at .] > > 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

bug#64937: boot time on Linux

Po Lu wrote: > > 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. No, it isn't. The attached file, when compiled and run under Termux (which

bug#64937: boot time on Linux

Bruno Haible writes: > Po Lu wrote: >> > 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. > > No, it isn't. The attached file, when comp

bug#64937: boot time on Linux

On 2023-08-09 19:14, 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), which cannot establish the precise time the system started Emacs doesn't need a precise boot time. Al