Python | os._exit() method

Last Updated : 26 Aug, 2019

OS module in Python provides functions for interacting with the operating system. OS comes under Python’s standard utility modules. This module provides a portable way of using operating system dependent functionality.

os._exit() method in Python is used to exit the process with specified status without without calling cleanup handlers, flushing stdio buffers, etc.

Note: This method is normally used in child process after os.fork() system call. The standard way to exit the process is sys.exit(n) method.

Syntax: os._exit(status)
Parameter:
status: An integer value or above defined values representing the exit status.

Return type: This method does not return any value in the calling process.

Code: Use of os._exit() method

# 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)

Output:

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


In parent process
Child's exit code: 0

References: https://docs.python.org/3/library/os.html#os._exit

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Python | os._exit() method