Date: Sun, 27 Oct 2019 17:14:22 -0400 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: [PATCH] remaining steps for time64 switchover On Sun, Oct 27, 2019 at 05:12:59PM -0300, Matias Fonzo wrote: > Hello Laurent, > > Can utmps work without s6?. I mean, independently of the init > system or distribution... Laurent could answer in better detail, but as a quick answer, there's no requirement from having s6 installed that you use it as your init system. Rich > El 2019-10-27 05:32, Laurent Bercot escribió: > >>Or here. So, the story on utmpx: we can either > >> > >>1. match the current size on 32-bit archs, but move the timeval to > >> unused space at the end where a time64 version fits, or > >> > >>2. match the current size and layout of the 64-bit struct, making it > >> possible to share records between 32- and 64-bit processes on the > >> same machine. > >> > >>Keep in mind that this struct is not used anywhere in libc presently, > >>but normally it's used as a format for on-disk records. > >> > >>I'm kinda leaning towards option 2, but being that I don't use (and > >>hate) utmp, I'd rather hear opinions from people who do use it. Either > >>way time fields in existing data will break, so it's a question of > >>whether that one-time breakage is already sufficient to go a bit > >>further and get 32/64 compat afterwards. > > > >I don't use the libc's utmpx, but I maintain utmps, which is a secure > >implementation of utmp, including the definition of struct utmpx. > >I haven't been following the time64 thing closely. The current struct > >utmpx definition includes a struct timeval. Will it need to change, > >or will musl's struct timeval change be enough and naturally propagate > >so the struct utmpx will become time64-compatible? > > > >On-disk data is not a problem. On the distro that I know uses utmps > >(Adélie), the utmp/wtmp records, by design, do not survive a reboot, > >so a reboot will fix everything - and will be mandatory anyway on > >arches where the musl ABI changes. > > > >I'm not aware of any distribution that uses musl, doesn't use utmps, > >and still keeps on-disk utmpx records. > > > >-- > >Laurent
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