import asyncio

import functools

import os

import signal

"""

信号值      符号      行为

2          SIGINT    进程终端，CTRL+C

9          SIGKILL   强制终端

15         SIGTEM    请求中断

20         SIGTOP    停止（挂起）进程 CRTL+D

"""

def exit(sign_name):

    print(f"获取信号{sign_name}: exit")

    loop.stop()

loop = asyncio.get_event_loop()

for sign_name in ('SIGINT', 'SIGTERM'):

    loop.add_signal_handler(getattr(signal, sign_name),

                            functools.partial(exit, sign_name))

print(" Ctrl+C 停止运行.")

print(f"pid {os.getpid()}: 发送 SIGINT 和 SIGTERM 信号退出循环")

try:

    loop.run_forever()

finally:

    loop.close()