linux-kernel - Re: [PATCH 03/29] modpost: add read_text_file() and get

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Message-ID: <20200520122920.GB325280@hirez.programming.kicks-ass.net>
Date:   Wed, 20 May 2020 14:29:20 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Jessica Yu <jeyu@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 03/29] modpost: add read_text_file() and get_line()
 helpers

On Wed, May 20, 2020 at 09:17:45PM +0900, Masahiro Yamada wrote:

> The specification [1] says this:
> 
> "The value returned may be less than nbyte if the number of bytes
> left in the file is less than nbyte, if the read() request was
> interrupted by a signal, or if the file is a pipe or FIFO or
> special file and has fewer than nbyte bytes immediately available
> for reading."
> 
> 
> This case does not meet any of 'if ...' parts.

So nobody ever ^Z's their build? I really don't think you can assume
that you'll never get a signal. That's just asking for trouble.

Doing the right thing here is 'trivial', there is absolutely no reason
to not do it.