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Thank you.  That was exactly what I needed!

I did re-write the first function to not depend on your stuff (in case
anyone else wants it).

#!/usr/bin/env lua

local posix = require('posix')
local data  = string.rep("a",72) .. "\n"

for i = 1 , 5 do
   local my_time = posix.time()
   io.stdout:write(my_time .. data)
   posix.sleep(1) -- delay 1 second

Thanks again,

On Tue, Apr 5, 2016 at 7:31 PM, Sean Conner <> wrote:
> It was thus said that the Great Dan Christian once stated:
>> I want to run a sub-process that may or may-not generate output.  How
>> can I make sure I don't block trying to read it.  I'm happy to use
>> luaposix, but I'm trying not to use a big event framework like lua-ev
>> (because I'm memory limited and also don't want to cross compile it).