Hello,
> I am not asking about the signals, I understand them,
> I am asking about the registration of the SIGNAL handler and how it knows
> that you are trying to register SIGKILL, you get an error like this.
>
> ./signal-catcher.py
> Traceback (most recent call last):
> File "./signal-catcher.py", line 22, in <module>
> signal.signal(signal.SIGKILL, signal_handler_kill)
> RuntimeError: (22, 'Invalid argument')
>>> import errno
>>> errno.errorcode[22]
'EINVAL'
EINVAL is the error returned by the standard POSIX signal() function
when trying to register a handler for SIGKILL. As the signal() man page
says:
[...]
The signals SIGKILL and SIGSTOP cannot be caught or ignored.
[...]
ERRORS
EINVAL signum is invalid.
So, in short, Python doesn't check SIGKILL by itself. It's just
forbidden by the underlying C standard library, and Python propagates
the error as a RuntimeError.
Regards
Antoine.
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