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Duck wrote:
Forgive my ignorance, but why do you need two other words,

each pipe is an unidireccional channel between two ends; so you have to give two endpoints (one of each pipe) to the process, and use the other two to read and write.

what you're asking for could (in theory, i guess) would need sockets (which are bidirectional). you creae a socket pair (using socketpair(), of course), give one to the process creator and use the other to read/write

like this:

local sktA, sktB = socketpair()
local proc, err = os.spawn (stdio=sktB, ...)
-- use sktA to communicate

i don't know how hard would it be to make os.spawn accept a socket and use it for both stdin and stdout...