Return value for "impossible" situations
bernd at petrovitsch.priv.at
Sun Jul 25 14:59:30 EDT 2021
On 25/07/2021 20:07, Ian Pilcher wrote:
> For kernel code, I can use pr_err, dump_stack, WARN_ON, etc. to report
> the issue in the log, but I often also need to return some sort of error
> code (negative errno value).
This value goes up to userspace (otherwise it makes no real sense to use
> Is there any sort of convention around what to return in the case of an
> error in the logic of the code itself, something that will make it as
> obvious as possible that the problem is a bug.
That depends on the situation/sys-call/....
You habe to choose the value (the list and short explanation is in `man
errno`) which leads the userspace application and it's user in the best
And no, you can't invent new values.
Bernd Petrovitsch Email : bernd at petrovitsch.priv.at
There is NO CLOUD, just other people's computers. - FSFE
LUGA : http://www.luga.at
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