[ruby-core:103600] [Ruby master Bug#17820] `Errno::EINVAL` from `Process.kill` with available signal on Windows

Issue #17820 has been updated by jeremyevans0 (Jeremy Evans).

Status changed from Open to Rejected

I tested every signal from `Signal.list` on Windows 10, and all signals work in some fashion, assuming you send the signal to the current process.  For `Process.kill`:

* INT raises a standard Interrupt exception
* ILL/SEGV simulates a crash and generates a backtrace (does not run ensure blocks)
* ABRT/FPE/KILL exits immediately (does not run ensure blocks)
* TERM exits immediately (runs ensure blocks)
* EXIT doesn't work

However, EXIT works for `Signal.trap`.  This code prints `1` and then `2`:

```
Signal.trap('EXIT'){p 2}
begin
  Process.kill('TERM', $$)
ensure
  p 1
end
```

So all signals listed in `Signal.list` are valid in some context.  The documentation for `Signal` itself states:

```
The list of available signal names and their interpretation is
system dependent.
```

So Ruby makes no guarantee that signal handling behavior will be consistent across systems.

Considering all this, I don't think the current behavior is a bug.  If you think the behavior or documentation could be improved, please submit a pull request.

----------------------------------------
Bug #17820: `Errno::EINVAL` from `Process.kill` with available signal on Windows
https://bugs.ruby-lang.org/issues/17820#change-91691

* Author: AlexWayfer (Alexander Popov)
* Status: Rejected
* Priority: Normal
* ruby -v: ruby 3.0.1p64 (2021-04-05 revision 0fb782ee38) [x64-mingw32] 
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
Hello.

I've installed Ruby on Windows via [Chocolatey](https://community.chocolatey.org/packages/ruby).

I receive `Errno::EINVAL` from `Process.kill` with almost every signal. Only `0` seems working. `TERM` (`15`), `INT` (`2`) — don't. Although they're in `Signal.list` output:

![](clipboard-202104222051-b64xq.png)


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clipboard-202104222051-b64xq.png (63.9 KB)
clipboard-202104222318-tbufr.png (96.8 KB)


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