/usr/lib/ruby/vendor_ruby/childprocess/unix.rb is in ruby-childprocess 0.5.9-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | module ChildProcess
module Unix
end
end
require "childprocess/unix/io"
require "childprocess/unix/process"
require "childprocess/unix/fork_exec_process"
# PosixSpawnProcess + ffi is required on demand.
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