local P = require 'posix'

local fd1 = P.open(arg[1], P.O_RDONLY)

local fd2 = P.open(arg[2], P.O_RDONLY)

local fds = {

  [fd1] = { events = {IN=true} },

  [fd2] = { events = {IN=true} }

}

while true do

  P.poll(fds,-1)

  for fd in pairs(fds) do

    if  fds[fd].revents.IN then

      local res = P.read(fd,1024)

      P.write(1,res);

    end

    if  fds[fd].revents.HUP then

      P.close(fd)

      fds[fd] = nil

      if not next(fds) then return end

    end

  end

end