[ruby-core:93904] [Ruby master Bug#12230] Wrong exception raised when IO.read from a pipe is passed an offset on Windows

Issue #12230 has been updated by jeremyevans0 (Jeremy Evans).

File win32-seek-espipe.patch added

I think we should fix this to make the behavior on Windows consistent with other operating systems.  Attached is a patch that attempts to do so.  I'm not sure if the approach the patch takes is the best way to fix this.  I also don't have a compilation environment on Windows, so a committer that does should probably check that the patch works.

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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#change-79975

* Author: vais (Vais Salikhov)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* 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>'
```

---Files--------------------------------
win32-seek-espipe.patch (1.17 KB)


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