Issue #10181 has been updated by Shugo Maeda.


Technorama Ltd. wrote:
> The proposed Dir api must provide a way to open both files and directories in order to be useful.
> 
> New proposal:
> 
> d1 = Dir.open('d1') => aDir
> d2 = d1.open('subdir') => aDir relative to d1
> file = d2.open_file('file') => aFile relative to d2

I prefer the following style:

    d1 = Dir.open("d1") #=> a Dir
    d2 = Dir.openat(d1, "subdir") #=> a Dir relative to d1
    file = File.openat(d2, "file") #=> a File relative to d2

Because it is clear that these methods call openat(2), and `at` is a preposition.
Other *at functions such as renameat() can be consistently implemented as singleton methods of File.


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Feature #10181: New method File.openat()
https://bugs.ruby-lang.org/issues/10181#change-54525

* Author: Technorama Ltd.
* Status: Open
* Priority: Normal
* Assignee: 
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The purpose of the openat() function is to enable opening files in directories other than the current working directory without exposure to race conditions. Any part of the path of a file could be changed in parallel to a call to open(), resulting in unspecified behavior. By opening a file descriptor for the target directory and using the openat() function it can be guaranteed that the opened file is located relative to the desired directory.

openat() is part of POSIX.1-2008.

Compatibility:
  Linux kernel >= 2.6.16
  FreeBSD >= 7.0
  OpenBSD >= 5.0
  NetBSD >= 6.1.4
  MacOS/X no

Pull request: https://github.com/ruby/ruby/pull/706



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