Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Cc:     mtk.manpages@gmail.com,
        Christian Brauner <christian.brauner@ubuntu.com>,
        Giuseppe Scrivano <gscrivan@redhat.com>,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6] close_range.2: new page documenting close_range(2)
To:     Stephen Kitt <steve@sk2.org>, linux-man@vger.kernel.org,
        Alejandro Colomar <alx.manpages@gmail.com>
References: <20210123161154.29332-1-steve@sk2.org>
From:   "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
Message-ID: <e761f00d-751f-f782-9af1-c5f868d52df0@gmail.com>
Date:   Thu, 28 Jan 2021 21:50:23 +0100
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101
 Thunderbird/78.6.0
MIME-Version: 1.0
In-Reply-To: <20210123161154.29332-1-steve@sk2.org>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Precedence: bulk

Hello Stephen, (and CHristian, please!)


Thanks for your patch revision. I've merged it, and have
done some light editing, but I still have a question:

On 1/23/21 5:11 PM, Stephen Kitt wrote:

[...]

> +.SH ERRORS

> +.TP
> +.B EMFILE
> +The per-process limit on the number of open file descriptors has been reached
> +(see the description of
> +.B RLIMIT_NOFILE
> +in
> +.BR getrlimit (2)).

I think there was already a question about this error, but
I still have a doubt.

A glance at the code tells me that indeed EMFILE can occur.
But how can the reason be because the limit on the number
of open file descriptors has been reached? I mean: no new
FDs are being opened, so how can we go over the limit. I think
the cause of this error is something else, but what is it?

Thanks,

Michael


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/