[tz] Re: 2025c zic.c calls fflush(3) on read only file pointer.

[Jonathan Wakely via tz]

On Thu, 18 Dec 2025 at 16:41, Christos Zoulas via tz <tz@iana.org> wrote:

> Looks like this changed recently:
> fflush
> <https://pubs.opengroup.org/onlinepubs/9799919799.2024edition/functions/fflush.html>
> pubs.opengroup.org
> <https://pubs.opengroup.org/onlinepubs/9799919799.2024edition/functions/fflush.html>
> [image: favicon.ico]
> <https://pubs.opengroup.org/onlinepubs/9799919799.2024edition/functions/fflush.html>
> <https://pubs.opengroup.org/onlinepubs/9799919799.2024edition/functions/fflush.html>
>
> So, I guess this is fine now and NetBSD is broken.
>

It was undefined in POSIX.1-2001:
https://pubs.opengroup.org/onlinepubs/000095399/functions/fflush.html

But well-defined in POSIX.1-2008:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/fflush.html

So "recently" is at least 17 years ago :-)

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