SIGTERM 不会在关机时被困

Question

我试图在 python 脚本中检测系统关闭，我需要优雅地停止一个线程，它只会在我杀死 -15 pid 时捕获它，但是当我关闭 -P 或关闭 -r 时它不会捕获信号

import time
import threading
import signal


class Job(threading.Thread):
    def __init__(self):
        threading.Thread.__init__(self)
        self.shutdown_flag = threading.Event()

    def run(self):
        while not self.shutdown_flag.is_set():
            time.sleep(0.5)

        f = open('threads.log', 'a')
        f.write('%s Thread #%s stopped\n' % self.ident)
        f.close()


class ServiceExit(Exception):
    pass


def service_shutdown(signum, frame):
    print('Caught signal %d' % signum)
    raise ServiceExit


def main():

    signal.signal(signal.SIGTERM, service_shutdown)
    signal.signal(signal.SIGINT, service_shutdown)

    try:
        j1 = Job()
        j2 = Job()
        j1.start()
        j2.start()

        while True:
            time.sleep(0.5)

    except ServiceExit:
        j1.shutdown_flag.set()
        j2.shutdown_flag.set()
        j1.join()
        j2.join()

    print('Exiting main program')

Answer 1

不是不捕获信号而是当时没有发送信号。 您必须配置 systemd 才能为您的程序执行此操作。