Fix handling of closed IO objects in IO::Event::Selector::Select.

[ioquatix]

IO.pipe do |input, output|
	Thread.new do
		sleep(0.1)
		input.close
	end

	pp IO.select([input], [], [], 1.0)
end

This program can raise both IOError or Errno::EBADF depending on the system. We need to handle that on Ruby 4+ which has better support for IO#close w.r.t. the fiber scheduler.

Types of Changes

• Bug fix.

Contribution

• I added tests for my changes.
• I tested my changes locally.
• I agree to the Developer's Certificate of Origin 1.1.