python使用fork新建/杀掉子进程

在linux 系统中 使用os.fork 新建一个子进程，11秒后杀掉该子进程
新建的子进程不受父进程的影响，即使父进程结束了，子进程仍然继续
记得要在子进程中写退出命令 exit() , 否则会走父进程结束。

import os
import time
import signal
def child_process():
    a = 0
    for a in range(0,100):
        time.sleep(1)
        print ("I am the child process and my PID is: %d" % os.getpid())

    print ("the child is exiting.")
    exit()

def parent_process():

    print ("I am the parent process whit PID : %d" % os.getpid())

    childId = os.fork()

    if childId == 0:
        #在子进程中
        child_process()
    else:
        #在父进程中
        print ("inside the parent process")
        print ("my child's pid is : %d" % childId)

    print("exit parent function")
    return childId
    print('-------')

def kill_pr(childId):
    os.kill(childId,signal.SIGKILL)

执行结果是：

[root@webServer zjx]# python test.py 
I am the parent process whit PID : 5799
inside the parent process
my child's pid is : 5800
exit parent function
I am the child process and my PID is: 5800
I am the child process and my PID is: 5800
I am the child process and my PID is: 5800
I am the child process and my PID is: 5800
I am the child process and my PID is: 5800
I am the child process and my PID is: 5800
I am the child process and my PID is: 5800
I am the child process and my PID is: 5800
I am the child process and my PID is: 5800
I am the child process and my PID is: 5800
[root@webServer zjx]#