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Showing content from https://github.com/jruby/jruby/issues/7515 below:

Process.wait and Process.wait2 not behaving as expected on Windows with JDK

On Windows, Process.wait is not setting $? (or $CHILD_STATUS) and Process.wait2 is returning nil.

This is happening within my GitHub Actions. I created a simple test here that shows the behavior:
https://github.com/jcouball/process_spawn_test/actions/runs/3632082827

This workflow is a matrix build that runs the tests on two different JRuby and MRI versions on both Ubuntu and Windows. Only the JRuby builds on Windows fail.

The test code is very simple and can be found here:
https://github.com/jcouball/process_spawn_test/blob/main/spec/test_spec.rb

Duplicated here:

require 'English'

describe 'Process#wait' do
  it 'should set the global $CHILD_STATUS variable' do
    pid = Process.spawn('exit 0')
    Process.wait(pid)
    expect($CHILD_STATUS).not_to be_nil
    expect($CHILD_STATUS.pid).to eq(pid)
  end
end

describe 'Process#wait2' do
  it 'should return a non-nil status' do
    pid = Process.spawn('exit 0')
    exited_pid, status = Process.wait2(pid)
    expect(status).not_to be_nil
    expect(status.pid).to eq(pid)
  end
end

I suspect this might be a configuration error with the Windows image I am using. I don't have access to a Windows computer or virtual environment so can't debug it on my own. Also, my Windows experience is rusty.

Environment Information

The environment where I am seeing unexpected behavior:

• JRuby 9.3.9.0 and JRuby 9.4.0.0
• Windows Server 2022 (20221127 update) (see this page for more details of what is included in this Windows image)
• The following environment variables are included:
  • JAVA_OPTS: -Djdk.io.File.enableADS=true
  • JRUBY_OPTS: --debug -Xnative.verbose=true
• The Gemfile only includes the rspec gem

Environments where I see the expected behavior:

• JRuby 9.3.9.0 and JRuby 9.4.0.0 on Ubuntu
• MRI Rubys on both Ubuntu and Windows

Expected Behavior

• Process.wait should set $? / $CHILD_STATUS
• Process.wait2 should return [pid, status] instead of nil.

Actual Behavior

• After calling Process.wait, $? / $CHILD_STATUS is nil.
• Process.wait2 is returning nil instead of [pid, status].

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