linux-kernel - Device to write to all (serial) consoles

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Date:   Fri, 2 Aug 2019 15:23:08 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-serial@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Donald Buczek <buczek@...gen.mpg.de>
Subject: Device to write to all (serial) consoles

Dear Linux folks,

On a lot of devices, like servers, you have more than one serial console,
and you do not always know, how they are numbered. Therefore, we start a
console on ttyS0 and ttyS1.

In user space, we also would like to write to both consoles to not worry
about the numbering. Writing to `/dev/console` only write to the active
console.

    $ more /proc/consoles # I think
    tty0                 -WU (EC p  )    4:1
    ttyS0                -W- (E  p a)    4:65
    ttyS1                -W- (E  p a)    4:65

Does a device exist, or can a device be configured so you can write to
all (serial) consoles from user space?

Kind regards,

Paul

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