[systemd-devel] Antw: Antw: [EXT] Re: Q on serial-getty

[Ulrich Windl]

>>> "Ulrich Windl" <Ulrich.Windl at rz.uni-regensburg.de> schrieb am 08.10.2020
um
08:07 in Nachricht <5F7EAC8B020000A10003BCEE at gwsmtp.uni-regensburg.de>:
>>>> Silvio Knizek <killermoehre at gmx.net> schrieb am 07.10.2020 um 21:17 in
> Nachricht <bd707b1b06e5b2f281c79ac2369ad24d9391b0e8.camel at gmx.net>:
>> Am Mittwoch, den 07.10.2020, 08:49 +0200 schrieb Ulrich Windl:
>>> Hi!
>>>
>>> I'm thinking of configuring a serial getty in SLES15 (systemd‑234). First
I
> 
>> found that there is no manual page describing the service, and second if I

>> use "systemctl show serial‑getty" ("systemctl show serial‑getty@" does not

>> work), I get some "funny" numbers:
>>>
>>> ...
>>> UID=4294967295
>>> GID=4294967295
>>> ...
>>> MemoryCurrent=18446744073709551615
>>> CPUUsageNSec=18446744073709551615
>>> TasksCurrent=18446744073709551615
>>> IPIngressBytes=18446744073709551615
>>> IPIngressPackets=18446744073709551615
>>> IPEgressBytes=18446744073709551615
>>> IPEgressPackets=18446744073709551615
>>> ...
>>> CPUWeight=18446744073709551615
>>> StartupCPUWeight=18446744073709551615
>>> CPUShares=18446744073709551615
>>> StartupCPUShares=18446744073709551615
>>> ...
>>>
>>> Obviously that number is the unsigned 64‑bit representation of ‑1, but 
>> considering that no such service is running, the output looks quite odd.
>>> If ‑1 means "unknown", why not use that string, or if it means
"unlimited",
> 
>> why not use that string?
>>>
>>> Regards,
>>> Ulrich
>> 
>> Hi Ulrich,
>> 
>> have you already tried `systemctl help serial‑getty at foo.service` (yes,
>> instanciatable units need a instance token, even if useless)? This
>> should open some documentation.
> 
> Hi!
> 
> (You never stop learning)
> I didn't know about that. Amazingly "systemctl help serial-getty@*" just
did
> not output anything (bit it set the exit code to 1), but "systemctl help

s/bit/but/

> serial-getty at x" did.
> 
> (My expecation would be that any program that is not a test program should
> output something to stderr when exiting with non-zero)
> 
>> Also, for the serial getty actually a generator is used to
>> automatically start it, if already requested by the boot loader and
>> kernel command line. See man:systemd‑getty‑generator(8) and
>> http://0pointer.de/blog/projects/serial‑console.html for more
>> information.
> 
> Thanks a lot for all that!
> 
> Regards,
> Ulrich
> 
>> 
>> BR
>> Silvio
>> 
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> 
> 
> 
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