从 python 启动和停止外部进程

Question

有没有办法从 python 启动和停止进程？我说的是一个持续的过程，我在通常运行ning 时用 ctrl+z 停止。我想启动这个过程，等待一段时间然后杀死它。我正在使用 linux.

this question 不像我的，因为在那里，用户只需要运行这个过程。我需要运行它并停止它。

Answer 1

也许你可以使用 Process 模块：

from multiprocessing import Process
import os
import time

def sleeper(name, seconds):
    print "Sub Process %s ID# %s" % (name, os.getpid())
    print "Parent Process ID# %s" % (os.getppid())
    print "%s will sleep for %s seconds" % (name, seconds)
    time.sleep(seconds)

if __name__ == "__main__":
    child_proc = Process(target=sleeper, args=('bob', 5)) 
    child_proc.start()
    time.sleep(2)
    child_proc.terminate()
    #child_proc.join()
    #time.sleep(2)
    #print "in parent process after child process join"
    #print "the parent's parent process: %s" % (os.getppid())

Answer 2

您可以使用os.kill函数发送-SIGSTOP（-19）和-SIGCONT（-18）

示例（未验证）：

import signal
from subprocess import check_output

def get_pid(name):
    return check_output(["pidof",name])

def stop_process(name):
    pid = get_pid(name)
    os.kill(pid, signal.SIGSTOP)

def restart_process(name):
    pid = get_pid(name)
    os.kill(pid, signal.SIGCONT)

Answer 3

I want to start the process, wait for some time and then kill it.

#!/usr/bin/env python3
import subprocess

try:
    subprocess.check_call(['command', 'arg 1', 'arg 2'],
                          timeout=some_time_in_seconds)
except subprocess.TimeoutExpired: 
    print('subprocess has been killed on timeout')
else:
    print('subprocess has exited before timeout')

见Using module 'subprocess' with timeout

从 python 启动和停止外部进程

Start and Stop external process from python

python

linux

subprocess

external-process