/usr/lib/ruby/vendor_ruby/io_extensions.rb is in ruby-ffi-rzmq 2.0.4-1.
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 10 11 12 13 14 15 16 17 18 19 | class IO
if defined? JRUBY_VERSION
require 'jruby'
def posix_fileno
case self
when STDIN, $stdin
0
when STDOUT, $stdout
1
when STDERR, $stderr
2
else
JRuby.reference(self).getOpenFile.getMainStream.getDescriptor.getChannel.getFDVal
end
end
else
alias :posix_fileno :fileno
end
end
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