Runs mednafen server, restarts it if it fails, and catch output to log file

mednafen-server-run-and-log.py

#!/usr/bin/env python3
#Runs mednafen server, restarts it if it fails, and catch output to log file

import subprocess
import time
import sys
import pty
import os

def reader(fd):
    try:
        while True:
            buffer = os.read(fd, 1024)
            if not buffer:
                return
            yield buffer
    except:
        pass


log = os.open('/var/log/mednafen', os.O_RDWR|os.O_CREAT|os.O_APPEND)
cmd = ['/usr/bin/mednafen-server' , '/root/standard.conf']

while True:
    master, slave = pty.openpty()
    p = subprocess.Popen(cmd, stdout=slave, stderr=slave, universal_newlines=True )
    os.close(slave)
    while p.poll() is None:
        for i in reader(master):
            os.write(log, i)
        time.sleep(3)