Python os._exit()方法

Python中的OS模块提供了与操作系统交互的函数。OS属于Python的标准实用模块。此模块提供了一种使用操作系统相关功能的可移植方式。 os._exit() 方法用于退出具有指定状态的进程，而不调用清理处理程序、刷新stdio缓冲区等。注意:此方法通常用于os.fork()系统调用后的子进程。退出进程的标准方法是 sys.exit (n) 方法.

os._exit 语法

os._exit(status) 

os._exit 参数

status:一个整数值或以上的定义值，表示退出状态。

返回类型:该方法在调用进程中不返回任何值。

os._exit 示例1

使用 os._exit()方法

# Python program to explain os._exit() method
 
# importing os module 
import os
 
# Create a child process
# using os.fork() method
pid = os.fork()
 
 
# pid greater than 0
# indicates the parent process
if pid > 0:
 
    print("\nIn parent process")
    # Wait for the completion
    # of child process and   
    # get its pid and
    # exit status indication using
    # os.wait() method
    info = os.waitpid(pid, 0)
 
     
    # os.waitpid() method returns a tuple
    # first attribute represents child's pid
    # while second one represents
    # exit status indication
 
    # Get the Exit code
    # used by the child process
    # in os._exit() method
     
    # firstly check if
    # os.WIFEXITED() is True or not
    if os.WIFEXITED(info[1]) :
        code = os.WEXITSTATUS(info[1])
        print("Child's exit code:", code)
 
else :
    print("In child process")
    print("Process ID:", os.getpid())
    print("Hello ! Geeks")
    print("Child exiting..")
     
    # Exit with status os.EX_OK
    # using os._exit() method
    # The value of os.EX_OK is 0       
    os._exit(os.EX_OK)

输出:

In child process
Process ID: 15240
Hello! Geeks
Child exiting..


In parent process
Child's exit code: 0