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SubjectRe: Device to write to all (serial) consoles
On Fri, Aug 02, 2019 at 03:23:08PM +0200, Paul Menzel wrote:
> 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.

So the same data to multiple console devices with just one userspace
call? Why?

> $ 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?

With one syscall, not that I know of, sorry.

greg k-h

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