我之前写过一个 PHP 版守护进程，但在使用的过程中，始终不如意，就使用Python 重构了。

其实守护进程的基础逻辑都差不了太多~~

#!/usr/bin/python
# -*- coding: utf-8 -*-

import time
import sys
import os
import subprocess

RUN = ‘work.run’

# 重启进程
def restart_program():
python = sys.executable
setRunPID(os.getpid())
os.execl(python, python, * sys.argv)

# 写进程 PID 至运行文件
def setRunPID(pid):
f = open(RUN, ‘w’)
f.write(str(pid))
f.close()
return True

# 获取进程
def getRunPID():
return open(RUN,’r’).read()
# 开始任务
def start():
# 判断任务是否存在
if os.path.exists(RUN):

oldPid = getRunPID()
runpid = str(os.getpid())
print(oldPid)
print(runpid)
if oldPid != runpid :
restart_program()

setRunPID(os.getpid())
num = 1
while(True):
print(num)
num += 1
time.sleep(5)

def stop():
pid = open(RUN).readline()
if pid:
if subprocess.call([“kill ” + pid], shell=True) == 0:
print ” | “.join([“Stop OK”, “PID:%s” % pid])
if subprocess.call([“rm ” + RUN], shell=True) != 0:
print “Delete Permission Denied”
else:
print “Stop Error”

def restart():
print “Restart….”

if __name__ == ‘__main__':
try:
arg = sys.argv[1]
except Exception:
print ” start | stop | restart ”
arg = ”
if(arg == ‘start’):
print “Start…”
start()
if(arg == ‘stop’):
if not os.path.exists(RUN):
print “Task does not start”
sys.exit(0)

print “Stopping…”
stop()
if(arg == ‘restart’):
if not os.path.exists(RUN):
print “Task does not start”
sys.exit(0)

print “Restart…”
stop()
time.sleep(1)
start()

GIT 地址：https://github.com/khlipeng/daemon

具体的使用逻辑，自行完善开发~