我怎么能发送从Python程序的信号？(How can I send a signal from a

我有这样的代码，它会监听USR1信号

import signal
import os
import time

def receive_signal(signum, stack):
    print 'Received:', signum

signal.signal(signal.SIGUSR1, receive_signal)
signal.signal(signal.SIGUSR2, receive_signal)

print 'My PID is:', os.getpid()

while True:
    print 'Waiting...'
    time.sleep(3)

这工作当我发送的信号与kill -USR1 pid

但我怎么能发送从相同的信号上面的Python脚本中，这样10秒后它会自动发送USR1并且还接收它，而我需要打开两个终端来检查呢？

Answer 1:

您可以使用os.kill（） ：

os.kill(os.getpid(), signal.SIGUSR1)

把你的代码，这在任何地方，你想从发送信号。

Answer 2:

如果你愿意搭上SIGALRM而不是SIGUSR1 ，请尝试：

signal.alarm(10)

否则，你需要启动另一个线程：

import time, os, signal, threading
pid = os.getpid()
thread = threading.Thread(
  target=lambda: (
    time.sleep(10),
    os.kill(pid, signal.SIGUSR1)))
thread.start()

因此，该程序：

import signal
import os
import time

def receive_signal(signum, stack):
    print 'Received:', signum

signal.signal(signal.SIGUSR1, receive_signal)
signal.signal(signal.SIGUSR2, receive_signal)
signal.signal(signal.SIGALRM, receive_signal)  # <-- THIS LINE ADDED

print 'My PID is:', os.getpid()

signal.alarm(10)                               # <-- THIS LINE ADDED

while True:
    print 'Waiting...'
    time.sleep(3)

生成以下输出：

$ python /tmp/x.py 
My PID is: 3029
Waiting...
Waiting...
Waiting...
Waiting...
Received: 14
Waiting...
Waiting...

文章来源: How can I send a signal from a python program?