uengine-runner/updatekiller.py

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#!/usr/bin/env python3
import sys
import os
import atexit
PIDFILE = '/tmp/uengine-runner.pid'
#程序结束时清理pid
@atexit.register
def remove_pid():
with open(PIDFILE) as pidfile:
pidlst = pidfile.readlines()
pidlst.remove(str(PID)+'\n')
with open(PIDFILE,'w') as pidfile:
pidfile.writelines(pidlst)
#更新时结束进程
def main():
for i in open(PIDFILE):
try:
os.kill(int(i),15)
except ProcessLookupError:
pass
os.remove(PIDFILE)
#当该程序被直接执行时执行结束进程操作。如果是导入的形式则只是记录pid
if __name__ == '__main__':
sys.exit(main())
else:
#获取进程pid用于更新时结束进程
PID = os.getpid()
with open(PIDFILE,'a') as pidfile:
print(PID,file=pidfile) #使用print可以在行末输出换行符而且可以省去类型转换