From: "nobu (Nobuyoshi Nakada)" <noreply@...>
Date: 2022-06-29T05:07:20+00:00
Subject: [ruby-core:109085] [Ruby master Bug#18881] IO#read_nonblock raises IOError when called following buffered character IO

Issue #18881 has been updated by nobu (Nobuyoshi Nakada).

Status changed from Open to Rejected

It is an expected behavior.
On Windows, text/binary conversion is used by default, and `ungetc` pushes back the character to the conversion buffer in that case.
The error message means this situation.

----------------------------------------
Bug #18881: IO#read_nonblock raises IOError when called following buffered character IO
https://bugs.ruby-lang.org/issues/18881#change-98230

* Author: javanthropus (Jeremy Bopp)
* Status: Rejected
* 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
----------------------------------------
The following example code works as expected on Linux but raises an `IOError` on Windows:

``` ruby
r, w = IO.pipe
w.write("foobar")
c = r.getc
r.ungetc(c)
r.read_nonblock(3)
```

  The error message is:
```
IOError: byte oriented read for character buffered IO
```



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