## limit.lua

    #! /usr/bin/env lua

    -- limit.lua
    -- Limiting the CPU time used by a child process;
    -- it will be killed and we don't get the final message

    local M = require 'posix.sys.resource'

    local times = require 'posix.sys.times'.times

    M.setrlimit (M.RLIMIT_CPU, {rlim_cur=1, rlim_max=1})

    local t = times().elapsed

    local pid = require 'posix.unistd'.fork ()
    if pid == 0 then -- child
       print 'start'
       for i = 1, 1e9 do
       end
       print 'finish'
    else
       print (require 'posix.sys.wait'.wait (pid))
       print (times().elapsed - t)
    end

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