wait3, wait4 and EINTR on Darwin

ruby-talk
1

Hi,

ruby 2.6.5p114 (2019-10-01 revision 67812) [x86_64-darwin19]

Darwin Kernel Version 19.6.0: Thu Jun 18 20:49:00 PDT 2020;
root:xnu-6153.141.1~1/RELEASE_X86_64 x86_64

I wrote an extension for wait3 & wait4 for Ruby a while back:

At some point in the Ruby and/or Mac lifecycle...I'm not sure when....the
wait3 and wait4 methods started raising EINTR errors on my Mac:

# gem install proc-wait3
require 'proc-wait3'
pid = fork{ sleep 2 } # also tried exec "sleep 2"
puts "PID: #{pid}"
p Process.wait3 # boom, Errno::EINTR

This works as expected on my Linux VM. Anyone know what's happening on Mac?
Is there some kind of sigchld handling happening internally that I'm not
aware of?

Thanks,

Dan