[ruby-core:109880] [Ruby master Bug#18880] IO#sysread on Windows does not validate arguments

Issue #18880 has been updated by javanthropus (Jeremy Bopp).


I submitted PR https://github.com/ruby/ruby/pull/6354 with a simple fix.  I don't have a Windows system to test with though, so I couldn't verify that it works.

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Bug #18880: IO#sysread on Windows does not validate arguments
https://bugs.ruby-lang.org/issues/18880#change-99121

* Author: javanthropus (Jeremy Bopp)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
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When passing an invalid number of bytes to read, such as `-1` , to `IO#sysread` on Linux, an `ArgumentError` is raised.  On Windows `Errno::EINVAL` is raised instead.

``` ruby
r, w = IO.pipe
r.sysread(-1)
```

This raises `ArgumentError` on non-Windows and `Errno::EINVAL` on Windows.




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