[ruby-core:87260] [Ruby trunk Misc#12474] Wishlist for Windows Unix compatibility features

Issue #12474 has been updated by emk (Masatoshi Kimura).


> Remove a file which is opened by another process

Fall Creators Update added FILE_DISPOSITION_POSIX_SEMANTICS.
https://docs.microsoft.com/en-us/windows-hardware/drivers/ddi/content/ntddk/ns-ntddk-_file_disposition_information_ex

> UNIXSocket

April 2018 Update added AF_UNIX sockets.
https://blogs.msdn.microsoft.com/commandline/2018/02/07/windowswsl-interop-with-af_unix/

Just FYI, I did not test them.

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Misc #12474: Wishlist for Windows Unix compatibility features
https://bugs.ruby-lang.org/issues/12474#change-72250

* Author: naruse (Yui NARUSE)
* Status: Third Party's Issue
* Priority: Normal
* Assignee: 
----------------------------------------
## fork(2)

Windows already has related features like `CreateProcess`, but for servers and workers fork is required for source code compatibility of existing scripts,
which are written for Unix.

## nonblocking IO

* To check socket's availability by `IO#read_nonblock` https://github.com/ruby/ruby/pull/1089
* `O_NONBLOCK`

## tz

Get IANA timezone name of current timezone from OS.

## Remove a file which is opened by another process

If the process opens the file with `CreateFile` with `FILE_SHARE_DELETE` flag, another process can remove the file.
But in that case processes can't remove its parent folder.
https://bugs.ruby-lang.org/issues/11218

## symlink

Windows has mklink and SeCreateSymbolicLinkPrivilege, but it has some limitations.
http://k-takata.o.oo7.jp/diary/2013-04.html#03
https://twitter.com/n0kada/status/570232516545638400

## fd
### Generic handling of file, pipe, socket by fd
### fd passing to child process other than 0,1,2
### Get access mode from fd/HANDLE
### System side append mode

### a high performance selector API
https://tonyarcieri.com/a-gentle-introduction-to-nio4r

## socket

`CloseHandle` should work with socket.

## writev(2)

https://twitter.com/okuoku/status/670212493134852097
https://msdn.microsoft.com/ja-jp/library/windows/desktop/aa365749%28v=vs.85%29.aspx

## ANSI color code

http://srad.jp/story/16/02/09/0639223/

## UNIXSocket

We can emuate UNIXSocket with named pipe?



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