Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.os.linux.misc
Subject: Re: Shutdown - 25 Years Later
Date: Sat, 19 Apr 2025 22:22:51 -0000 (UTC)
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On Sat, 19 Apr 2025 21:10:58 -0000 (UTC), Jim Jackson wrote:

> On 2025-04-19, Charlie Gibbs <cgibbs@kltpzyxm.invalid> wrote:
>>
>> On 2025-04-18, Lawrence D'Oliveiro <ldo@nz.invalid> wrote:
>>
>>> On Fri, 18 Apr 2025 08:53:05 +0100, Andy Burns wrote:
>>>
>>>> I don't remember if I ever used  sync; sync; halt
>>>> 
>>>> on linux, but certainly on older *nixes
>>>
>>> The need for multiple “sync” calls was a bit of voodoo black magic
>>> leftover from a bug/misfeature in early Unix kernels.
>>>
>>> I don’t think it’s ever been necessary on Linux.
>>
>> The story I heard was that typing "sync" three times takes long enough
>> that the system has time to flush all its buffers before you do
>> anything else.
> 
> But sync shouldn't return until the buffers have flushed.
> So repeats are not needed.

Correct. That was the bug.