Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:110372
MIME-Version: 1.0
References: <CA+p1FabH1rL48z=QNP8324WNmaJvAN=skfWi7b9NCnpU5MVHag@mail.gmail.com>
 <CAF+90c_+q4kQf31BHE-48ggZH4kUMRtZXsE99QOY96wjUFxDrg@mail.gmail.com>
In-Reply-To: <CAF+90c_+q4kQf31BHE-48ggZH4kUMRtZXsE99QOY96wjUFxDrg@mail.gmail.com>
Date: Thu, 4 Jun 2020 15:19:01 +0100
Message-ID: <CA+p1FaZPn4_KwUW9pZaTS1D0y-qH9zuMnj7KJE52-mBxDX4HGA@mail.gmail.com>
To: Nikita Popov <nikita.ppv@gmail.com>
Cc: PHP internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary="00000000000067f63405a742d419"
Subject: Re: [PHP-DEV] RFC proposal: fsync support for file resources
From: davidgebler@gmail.com (David Gebler)

--00000000000067f63405a742d419
Content-Type: text/plain; charset="UTF-8"

It's interesting that you mention fdatasync - perhaps a better C programmer
than I am can correct me, but I don't think it has an equivalent on
Windows, where _commit() is a wrap on FlushFileBuffers API. So in respect
of PHP implementation, the options would be:

fdatasync() is not available on Windows, but fsync() is. fdatasync() is
available on UNIX builds.

fdatasync() on Windows is an alias of fsync(), on UNIX fdatasync() is as
expected.

Only fsync() is implemented for both Windows and Unix.

-Dave

On Wed, 3 Jun 2020, 11:16 Nikita Popov, <nikita.ppv@gmail.com> wrote:

> On Mon, Jun 1, 2020 at 6:57 PM David Gebler <davidgebler@gmail.com> wrote:
>
>> Exactly as the subject says, I would like to propose an RFC for adding an
>> fsync() function for file resources, which would in essence be a thin
>> wrapper around C's fsync on UNIX systems and _commit on Windows.
>>
>> It seems to me an odd oversight that this has never been implemented in
>> PHP
>> and means PHP has no way to perform durable file write operations, making
>> it inherently unsuitable for any systems requiring more intensive I/O,
>> mission critical logs, auditing, etc.
>>
>> I am not really a C programmer and I have been able to implement a simple
>> working prototype of this as a compiled extension in merely a few hours,
>> so
>> I'm sure it wouldn't be difficult to bring in to the language core where
>> the functionality really belongs.
>>
>> Every other major programming language otherwise comparable to PHP in
>> features supports a way of providing durability.
>>
>> Thanks.
>>
>
> No objections from my side. I assume you'd want to add both fsync() and
> fdatasync()?
>
> I think all it takes for this one is a PR...
>
> Regards,
> Nikita
>

--00000000000067f63405a742d419--