Dual cu sessions?

[Warner Losh]

On Sat, Oct 5, 2019, 8:08 PM bob prohaska <fbsd at www.zefox.net> wrote:

> Is it normal to see two cu sessions running on the same device?
>
> I happened to run ps -aux on a Pi2 running stable/12 and noticed
> root   1343   0.0  0.1   4372   1408  3  I+   16:19     0:00.02 cu -l
> cuaU0 -s 115200
> root   1344   0.0  0.1   4372   1384  3  I+   16:19     0:00.01 cu -l
> cuaU0 -s 115200
>
> One session is intentional; it provides serial access to the console of a
> second
> machine in my Pi cluster. That I might mistakenly _start_ two sessions
> isn't a
> huge surprise, that it persists does seem a little odd. I'd expect "device
> busy".
> This is a stable/12 machine, updated yesterday.
>
> Thanks for reading and any insights....
>

Totally normal. Cu forks so that IO doesn't stall it. This was a standard
plot before threads.

Warner

bob prohaska
>
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