Re: bug#64937: "who" reports funny dates

[Robert Pluim]

>>>>> On Tue, 08 Aug 2023 18:11:20 +0200, Bruno Haible <bruno@clisp.org> said:

    Bruno> Robert Pluim wrote:
    Thorsten> They don't record at all.
    Thorsten> Which means tools like who just don't show anything. And emacs 
will
    Thorsten> never find out the boot time with the current code.
    >> 
    >> What API do you suggest we use instead?

    Bruno> musl libc runs only on Linux. On Linux, you can use this approach 
from Gnulib:
    Bruno> 
https://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=blob;f=lib/readutmp.c;h=4e1d7ec26bef6cba4474433f72c9079b61794b97;hb=HEAD#l96
    Bruno> lines 96..150.

So either reading "/proc/uptime" or calling "sysinfo". Iʼm assuming
the former is just the latter written to a file as a string, which we
can then parse again and turn into an integer. How efficient :-)

    Bruno> Part of it may already be contained in emacs/src/filelock.c; I can't 
tell.

No, that currently uses either sysctl (probably only on *BSD and
macOS) or utmp/wtmp.

Robert
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