## poll.lua

    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

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