Pour compléter ces exemples

En utilisant une socket de type AF_INET c’est un peu différent.

#!/usr/bin/env python3
import sys
import subprocess
import socket
import signal
import os
pidFilename = '/tmp/'+sys.argv[0]+'.pid'
def graceful_exit(signum, frame):
 print('I terminate, my PID is '+str(os.getpid())+' and I received signal '+str(signum)+'', file=sys.stderr, flush=True)
 sys.exit(0)
try:
 if sys.argv[1] == 'start':
 sleeper = subprocess.Popen([sys.argv[0], 'run'], stdin=subprocess.PIPE, shell=False)
 pidfile = open(pidFilename,'w')
 _pid = str(sleeper.pid)
 pidfile.write(_pid)
 pidfile.close()
 elif sys.argv[1] == 'run':
 signal.signal(signal.SIGTERM, graceful_exit)
 signal.signal(signal.SIGINT, graceful_exit)
 server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 server.bind(('127.0.0.1', 1234))
 server.listen(3)
 while True:
 client, addr = server.accept()
 message = client.recv(65535).decode('UTF-8')
 if message:
 print('I’m alive, my PID is '+str(os.getpid())+' and I’ve been told to say : « '+message+' »', file=sys.stderr, flush=True)
 elif sys.argv[1] == 'stop': 
 try:
 pidfile = open(pidFilename,'r')
 os.kill(int(pidfile.read()), signal.SIGTERM)
 pidfile.close()
 os.unlink(pidFilename)
 except (FileNotFoundError, ProcessLookupError):
 pass
 elif sys.argv[1] == 'say' and len(sys.argv) > 1:
 client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 client.connect(('127.0.0.1', 1234))
 client.send(bytes(sys.argv[2],'utf8'))
except IndexError as e:
 print(str(e), file=sys.stderr)