[TUHS] Off topic: BSD timezone function vs. POSIX timezone variable
Leah Neukirchen
leah at vuxu.org
Fri Dec 15 01:14:16 AEST 2023
Aharon Robbins <arnold at skeeve.com> writes:
> Hi All.
>
> This is a bit off-topic, but people here are likely to know the answer.
>
> V7 had a timzone function:
>
> char *timezone(int zone, int dst);
>
> that returned a timezone name. POSIX has a timezone variable which is
> the offset in seconds from UTC.
>
> The man pages for all of {Net,Free,Open}BSD seem to indicate that both
> are available on those systems.
>
> My question is, how? The declarations for both are given as being in <time.h>.
> But don't the symbols in libc.a conflict with each other? How does a programmer
> on *BSD choose which version of timezone they will get?
OpenBSD 7.3 only has "extern long timezone" and no timezone(3) function.
FreeBSD 14.0 only has the timezone(3) function (under _BSD_VISIBLE),
and doesn't set any variables.
--
Leah Neukirchen <leah at vuxu.org> https://leahneukirchen.org/
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