linux-kernel - RE: [PATCH] proc: give /proc/cmdline size

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Date:   Fri, 9 Sep 2022 07:37:37 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Alexey Dobriyan' <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: RE: [PATCH] proc: give /proc/cmdline size

From: Alexey Dobriyan
> Sent: 09 September 2022 06:07
> 
> On Thu, Sep 08, 2022 at 01:45:46PM -0700, Andrew Morton wrote:
> > On Thu, 8 Sep 2022 21:21:54 +0300 Alexey Dobriyan <adobriyan@...il.com> wrote:
> >
> > > Most /proc files don't have length (in fstat sense). This leads
> > > to inefficiencies when reading such files with APIs commonly found in
> > > modern programming languages. They open file, then fstat descriptor,
> > > get st_size == 0 and either assume file is empty or start reading
> > > without knowing target size.
> > >
> > > cat(1) does OK because it uses large enough buffer by default.
> > > But naive programs copy-pasted from SO aren't:
> >
> > What is "SO"?
> 
> StackOverflow, the source of all best programs in the world!

Anyone directly copying anything from there gets what
they deserve.

Useful for hints, but they are so often wrong.

	David

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