Python | os.WEXITSTATUS() 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.WEXITSTATUS() method in Python is used to get the integer parameter used by a process in exit(2) system call if os.WIFEXITED(status) is True. If os.WIFEXITED(status) is False then the method returns a meaningless value.

Syntax: os.WEXITSTATUS(status)

Parameter:
status: This parameter takes process status code (an integer value) as returned by os.system(), os.wait() or os.waitpid() method.

Return type: This method returns an integer value used by a process in exit(2) system call.

Code: Use of os.WEXITSTATUS() method

# Python program to explain os.WEXITSTATUS() 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 : 
  
    # Create one more child 
    pid2 = os.fork() 
      
    if pid2 : 
          
        print("\nIn parent process") 
        # Wait for the completion  
        # of first child process and     
        # get its pid and  
        # exit status indication using 
        # os.waitpid() method 
        info1 = os.waitpid(pid, 0) 
  
          
        # Wait for the completion  
        # of second child process and     
        # get its pid and  
        # exit status indication using 
        # os.waitpid() method 
        info2 = os.waitpid(pid2, 0) 
  
          
        # os.waitpid() method returns a tuple 
        # first attribute represents child's pid 
        # while second one represents 
        # exit status indication 
  
        # Get the integer parameter  
        # used first child process 
        # in exit(2) system call 
          
        # firstly check if 
        # os.WIFEXITED() is True or not 
        if os.WIFEXITED(info1[1]) : 
            code = os.WEXITSTATUS(info1[1]) 
            print("First child's exit code:", code) 
        else : 
            print("First child does not exited using exit(2) system call.") 
  
        # Get the integer parameter  
        # used second child process 
        # in exit(2) system call 
          
        # firstly check if 
        # os.WIFEXITED() is True or not 
        if os.WIFEXITED(info2[1]) : 
            code = os.WEXITSTATUS(info2[1]) 
            print("\nSecond child's exit code:", code) 
        else : 
            print("\nSecond child does not exited using exit(2) system call.") 
          
  
           
    else : 
        print("\nIn second child process") 
        print("Process ID:", os.getpid()) 
        print("Hey ! there") 
        print("Second child aborted") 
  
        # os.abort() method will 
        # generate a SIGABRT signal 
        # to the current process. 
        os.abort()     
  
else : 
    print("In first child process") 
    print("Process ID:", os.getpid()) 
    print("Hello ! Geeks") 
    print("First child exiting..") 
      
    # Exit with status code 5 
    # using os._exit() method         
    os._exit(5) 

Output:

In first child process
Process ID: 11614
Hello! Geeks
First child exiting..

In second child process
Process ID: 11615
Hey! there
Second child aborted

In parent process
First child's exit code: 5
Second child does not exited using exit(2) system call.

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

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