linux-kernel - Re: [PATCH] printk: Export log_buf

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Message-ID: <87wnb9pk8k.fsf@jogness.linutronix.de>
Date:   Mon, 15 Aug 2022 18:09:23 +0206
From:   John Ogness <john.ogness@...utronix.de>
To:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        Marc Aurèle La France 
        <tsi@...oix.net>
Cc:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH] printk: Export log_buf_len to userland

On 2022-08-15, Sergey Senozhatsky <senozhatsky@...omium.org> wrote:
> On (22/08/10 14:25), Marc Aurèle La France wrote:
>> 
>> Make the kernel log's buffer size available to userland so it can be
>> used with `dmesg -s`.

This information is already available via:

    klogctl(SYSLOG_ACTION_SIZE_BUFFER, NULL, 0)

And dmesg already uses this with "dmesg -S".

John Ogness