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
