luaposix 35.1 Reference

## fork2.lua

    #! /usr/bin/env lua

    local M = require 'posix.unistd'

    print ('parent: my pid is: ' .. M.getpid())

    local childpid, errmsg = M.fork ()

    if childpid == nil then
       print('parent: The fork failed: ' .. errmsg)
    elseif childpid == 0 then
       print('child: Hello World! I am pid: ' .. M.getpid())
       print("child: I'll sleep for 1 second ... ")
       M.sleep(1)
       print('child: Good bye');
    else
       print("parent: While the child sleeps, I'm still running.")
       print('parent: waiting for child (pid:' .. childpid .. ') to die...')
       require 'posix.sys.wait'.wait(childpid)
       print("parent: child died, but I'm still alive.")
       print('parent: Good bye')
    end

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