bug#64937: "who" reports funny dates

[Paul Eggert]

On 2023-07-31 00:08, Thorsten Kukuk wrote:
> 1. you need to extend ut_tv from 32bit time_t to 64bit time_t, or your
> patch will not survive 2038.

Yes, that's the plan. Gnulib's readutmp module already does this, in 
apps that also use the year2038 or year2038-recommended modules (which 
most do).

> 2. the string entries are size limited in struct utmp, but are not with
> libsystemd. So could be that you need to truncate device names, user
> names and host names.

This suggests that Gnulib needs to redo the readutmp API so that it's 
not tied to struct utmpx's fixed string lengths. That's a bit of a 
hassle but should be doable (change char array to char *). An advantage 
is that Gnulib is a source-code library and so we can make binary- (and 
even source-) incompatible changes to the API without too much trouble.

Thanks for the advice.