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Update to follow DCD

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The DCD signal can be used to detect remote connect attempt
This commit is contained in:
Jarrod Johnson 2019-03-14 13:05:59 -04:00
parent f1e83d938b
commit b0d2d44b75
1 changed files with 33 additions and 3 deletions
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36
misc/autocons.py
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@ -1,7 +1,10 @@
import fcntl
import os
import signal
import struct
import subprocess
import termios
import time
addrtoname = {
0x3f8: '/dev/ttyS0',
@ -49,12 +52,39 @@ def do_serial_config():
termios.tcsetattr(ttyf, termios.TCSANOW, currattr)
retval['connected'] = bool(struct.unpack('<I', fcntl.ioctl(
ttyf, termios.TIOCMGET, '\x00\x00\x00\x00'))[0] & termios.TIOCM_CAR)
os.close(ttyf)
return retval
def is_connected(tty):
ttyf = os.open(tty, os.O_RDWR | os.O_NOCTTY)
retval = bool(struct.unpack('<I', fcntl.ioctl(
ttyf, termios.TIOCMGET, '\x00\x00\x00\x00'))[0] & termios.TIOCM_CAR)
os.close(ttyf)
return retval
if __name__ == '__main__':
serialinfo = do_serial_config()
if serialinfo:
os.execl(
'/bin/setsid', 'setsid', 'sh', '-c',
'exec screen -x console <> {0} >&0 2>&1'.format(serialinfo['tty']))
running = False
while True:
if running and running.poll() is not None:
running = False
if running and not is_connected(serialinfo['tty']):
try:
running.terminate()
running.wait()
except Exception:
pass
time.sleep(0.5)
running = subprocess.Popen(['/bin/sh', '-c', 'exec screen -x console <> {0} >&0 2>&1'.format(serialinfo['tty'])])
time.sleep(0.5)
try:
running.terminate()
running.wait()
except Exception:
pass
running = False
elif not running and is_connected(serialinfo['tty']):
running = subprocess.Popen(['/bin/sh', '-c', 'exec screen -x console <> {0} >&0 2>&1'.format(serialinfo['tty'])])
time.sleep(0.5)