[ruby-core:109846] [Ruby master Bug#18880] IO#sysread on Windows does not validate arguments

Issue #18880 has been updated by nobu (Nobuyoshi Nakada).


The `ArgumentError` is correct.
Even on Windows, `sysread(-2)` raises an `ArgumentError` too.

At rounding up `len` in io.c:io_setstrbuf(), negative values are not considered.

----------------------------------------
Bug #18880: IO#sysread on Windows does not validate arguments
https://bugs.ruby-lang.org/issues/18880#change-99083

* 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
----------------------------------------
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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