From: vsalikhov@...
Date: 2016-03-30T09:04:19+00:00
Subject: [ruby-core:74724] [Ruby trunk Bug#12230] Wrong exception raised when IO.read from a pipe is passed an offset on Windows

Issue #12230 has been reported by Vais Salikhov.

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Bug #12230: Wrong exception raised when IO.read from a pipe is passed an offset on Windows
https://bugs.ruby-lang.org/issues/12230

* Author: Vais Salikhov
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.2.4p230 (2015-12-16 revision 53155) [i386-mingw32]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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When IO.read from a pipe is passed an offset, the expected exception is Errno::ESPIPE, but on Windows Invalid argument (Errno::EINVAL) is raised instead:

```
C:\Users\Administrator\Desktop>C:\Ruby\ruby-2.2.4-i386-mingw32\bin\ruby.exe -ve "p IO.read('|cmd.exe /C echo hello', 1, 1)"
ruby 2.2.4p230 (2015-12-16 revision 53155) [i386-mingw32]
The process tried to write to a nonexistent pipe.
-e:1:in `read': Invalid argument (Errno::EINVAL)
        from -e:1:in `<main>'
```



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