SOL_SOCKET, SO_PEERCRED in ruby

SOL_SOCKET-SO_PEERCRED.rb

#!/usr/bin/env ruby

require 'socket'
include Socket::Constants

UNIXServer.open("\0(abstract socket)") {|server|
  clinet = UNIXSocket.new("\0(abstract socket)")
  clinet.setsockopt(SOL_SOCKET, SO_PASSCRED, 1)

  sock = server.accept
  opt  = sock.getsockopt(SOL_SOCKET, SO_PEERCRED)

  pid, euid, egid = opt.unpack("i3")
  printf "pid: %d, euid: %d, egid: %s\n", pid, euid, egid
}