## fork.lua

    -- Lua version of example from pipe(2)
    local p = require 'posix'
    local r,w = p.pipe()
    local cpid = p.fork()
    if cpid == 0 then -- child reads from pipe
        p.close(w)  -- close unused write end
        local b = p.read(r,1)
        while #b == 1 do
            io.write(b)
            b = p.read(r,1)
        end
        p.close(r)
        p._exit(0)
    else -- parent writes to pipe
        p.close(r)
        p.write(w,"hello dolly\n")
        p.close(w)
        -- wait for child to finish
        p.wait(cpid)
    end

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