Re: io.popen() equivalent in nixio?

[Jo-Philipp Wich <xm@...>]

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Hi,

I once implemented a popen-ish ltn12 source function on top of nixio, it
reads like this:

- -- >8 --

function ltn12_popen(command)

	local fdi, fdo = nixio.pipe()
	local pid = nixio.fork()

	if pid > 0 then
		fdo:close()
		local close
		return function()
			local buffer = fdi:read(2048)
			local wpid, stat = nixio.waitpid(pid, "nohang")
			if not close and wpid and stat == "exited" then
				close = true
			end

			if buffer and #buffer > 0 then
				return buffer
			elseif close then
				fdi:close()
				return nil
			end
		end
	elseif pid == 0 then
		nixio.dup(fdo, nixio.stdout)
		fdi:close()
		fdo:close()
		nixio.exec("/bin/sh", "-c", command)
	end
end

- -- 8< --

I think you can easily adapt it to return the file descriptor instead of
a reader iterator closure.

~ Jow
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