mitmdump stdout never reaches parent process about mitmproxy

[Prinzhorn]

It's also interesting that the Python docs regarding PYTHONUNBUFFERED say

Changed in version 3.7: The text layer of the stdout and stderr streams now is unbuffered.

Aren't we using "the text layer"?

[Prinzhorn]

It behaves the same with the this ChatGTP Python parent process (just to rule out funny Node.js things):

import subprocess


def run_command(command):
    try:
        process = subprocess.Popen(
            command,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            shell=True,
            env=dict(PYTHONUNBUFFERED="1"),
        )

        while True:
            stdout_line = process.stdout.readline().decode().strip()

            if stdout_line:
                print("stdout:", stdout_line)

            # Check if both pipes are closed and process has terminated
            if not stdout_line and process.poll() is not None:
                break

    except Exception as e:
        print("Error:", e)


command = "/home/alex/Downloads/mitmproxy-10.2.4-linux-x86_64/mitmdump"
# command = "/home/alex/Downloads/mitmproxy-9.0.1-linux/mitmdump"
# command = "/home/alex/Downloads/mitmproxy-8.1.1-linux/mitmdump"
# command = "/home/alex/Downloads/mitmproxy-7.0.4-linux/mitmdump"
# command = "/home/alex/Downloads/mitmproxy-6.0.2-linux/mitmdump"
# command = "/home/alex/forks/mitmproxy/venv/bin/mitmdump"

run_command(command)