Can you fool isatty AND log stdout and stderr separately?

Question

Problem

So you want to log the stdout and stderr (separately) of a process or subprocess, without the output being different from what you\'d see in the terminal i

Answer 1

You can always allocate Pseudo-TTY, that's what screen does.

In Python you'd access it using pty.openpty()

This "master" code passes your test:

import subprocess, pty, os

m, s = pty.openpty()
fm = os.fdopen(m, "rw")
p = subprocess.Popen(["python2", "test.py"], stdin=s, stdout=s, stderr=s)
p.communicate()
os.close(s)
print fm.read()

Of course if you want to distinguish between stdin/out/err, your "slave" process will see different PYT names:

inp = pty.openpty()
oup = pty.openpty()
erp = pty.openpty()

subprocess.Popen([command, args], stdin=inp[1], stdout=uop[1], stderr=erp[1])