subprocess-usage-mockup.reb

REBOL []

p: make port! subprocess://foobar  ;; Would of course also need more ways to specify the subprocess to be created.
p/awake: func [event] [
    switch event/type [
        input [
            write event/port {Data sent to FOOBAR's stdin.}
        ]
        output [
            print [{Data received from FOOBAR's stdout:} copy event/port/data]
        ]
        error [
            print [{Data received from FOOBAR's stderr:} copy event/port/data]
        ]
        exit [
            print [{FOOBAR exited with return code:} event/port/state]
            return true
        ]
    ]
    false
]
open p