From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Cc: linux-kernel@vger.kernel.org,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
Jiri Slaby <jslaby@suse.com>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
linux-input@vger.kernel.org, dri-devel@lists.freedesktop.org,
kernel@collabora.com
Subject: Re: [PATCH v3 2/2] tty/sysrq: Add configurable handler to execute a compound action
Date: Fri, 2 Oct 2020 14:54:29 +0200 [thread overview]
Message-ID: <20201002125429.GA3350322@kroah.com> (raw)
In-Reply-To: <20200818112825.6445-3-andrzej.p@collabora.com>
On Tue, Aug 18, 2020 at 01:28:25PM +0200, Andrzej Pietrasiewicz wrote:
> Userland might want to execute e.g. 'w' (show blocked tasks), followed
> by 's' (sync), followed by 1000 ms delay and then followed by 'c' (crash)
> upon a single magic SysRq. Or one might want to execute the famous "Raising
> Elephants Is So Utterly Boring" action. This patch adds a configurable
> handler, triggered with 'C', for this exact purpose. The user specifies the
> composition of the compound action using syntax similar to getopt, where
> each letter corresponds to an individual action and a colon followed by a
> number corresponds to a delay of that many milliseconds, e.g.:
>
> ws:1000c
>
> or
>
> r:100eis:1000ub
A macro language for sysrq commands, who would have thought...
Anyway, _why_ would userland want to do something so crazy as this?
What is the use-case here?
thanks,
greg k-h
next prev parent reply other threads:[~2020-10-02 12:54 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-18 11:28 [PATCH v3 0/2] Add configurable handler to execute a compound action Andrzej Pietrasiewicz
2020-08-18 11:28 ` [PATCH v3 1/2] tty/sysrq: Extend the sysrq_key_table to cover capital letters Andrzej Pietrasiewicz
2020-08-18 11:28 ` [PATCH v3 2/2] tty/sysrq: Add configurable handler to execute a compound action Andrzej Pietrasiewicz
2020-10-02 12:54 ` Greg Kroah-Hartman [this message]
2020-10-02 13:42 ` Andrzej Pietrasiewicz
2020-10-02 14:02 ` Greg Kroah-Hartman
2020-10-02 15:06 ` Andrzej Pietrasiewicz
2020-10-03 8:26 ` Greg Kroah-Hartman
2020-10-02 12:31 ` [PATCH v3 0/2] " Greg Kroah-Hartman
2020-10-02 12:33 ` Andrzej Pietrasiewicz
2020-10-02 12:36 ` Andrzej Pietrasiewicz
2020-10-02 12:45 ` Daniel Vetter
2020-10-02 12:55 ` Greg Kroah-Hartman
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