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Message-ID: <ZhL49ROBldneqCGV@voyager>
Date: Sun, 7 Apr 2024 21:50:13 +0200
From: Markus Wichmann <nullplan@....net>
To: Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Cc: Waldemar Brodkorb <wbx@...nadk.org>, musl@...ts.openwall.com
Subject: Re: Busybox hwclock failing to build with musl RISC-V 32-bit:
SYS_settimeofday undefined
Am Sun, Apr 07, 2024 at 07:37:03PM +0200 schrieb Markus Wichmann:
> Hi,
>
> this is a very much a Busybox problem. musl does provide settimeofday(),
> but it doesn't send the time zone to the kernel. This is because the
> kernel time zone has some hardcoded unexpected uses, to be nice about
> it.
>
> The Busybox maintainers don't like that musl doesn't do this, and so
> call the syscall directly. And this fails for RISC-V, which doesn't have
> a SYS_settimeofday. I mean, it also fails for all the 32-bit
> architectures which do have a SYS_settimeofday but with a different
> timeval structure. But maybe the timezone structure is correct there.
>
> Busybox is trying to do the wrong thing here, simple as. The reasoning
> for not doing the right thing I have read is spurious at best. If the
> hwclock time is in local time, then /etc/localtime should be the correct
> time zone, and mktime() will provide the closest you are going to get to
> a "right" system time.
>
> Note that we recently had a thread about the perils of local time, and
> it is simply a mess, and sometimes libc has no good choices.
>
> Ciao,
> Markus
On an unrelated note, you may need to quote the entire message I sent
before because the Busybox mailing list refused my message since I am
not subscribed to it. And nor do I want to be.
Ciao,
Markus
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