Daemon Failing Due to Buffering Policy

[connordavison]

Hello,

DaemonizingMixin.daemonize seems to be throwing errors in Python 3+:

File "/vagrant/cli/daemon.py", line 95, in daemonize
    se = open(self.null, 'a+', 0)
ValueError: can't have unbuffered text I/O

#!/usr/bin/env python
# daemon.py
import cli.daemon

@cli.daemon.DaemonizingApp
def daemon(app):
    app.daemonize()

if __name__ == "__main__":
    daemon.run()

As the error suggests, this is due to Python 3+ not allowing unbuffered text I/O. I believe this can be fixed by either opening the stream in binary (mode="a+b"), or just opening it as buffered (buffering=-1 should suffice).

Please correct me if I've made an error!

Thanks for your time.