Python | os.WIFCONTINUED() 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.WIFCONTINUED() method in Python is used to check whether a process has been continued from a job control stop or not. This method takes process status code as returned by os.wait(), os.system() or os.waitpid() method as a parameter and returns True if the process has been stopped, otherwise returns False.

Syntax: os.WIFCONTINUED(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 a boolean value of class ‘bool’. This method returns True if the process has been continued from a job control stop, otherwise returns False.

Code: Use of os.WIFCONTINUED() method

   # Python program to explain os.WIFCONTINUED() method  
  
# importing os and signal module   
import os, signal 
  
# Create a child process 
# using os.fork() method  
pid = os.fork() 
  
  
# pid greater than 0 
# indicates the parent process  
if pid : 
      
    # Send signal 'SIGSTOP' 
    # to child process 
    # using os.kill() method 
    # signal 'SIGCONT' will cause 
    # the child process to stop 
    os.kill(pid, signal.SIGSTOP) 
  
    # Send signal 'SIGCONT' 
    # to child process 
    # using os.kill() method 
    # SIGCONT signal will cause 
    # the child process to continue 
    os.kill(pid, signal.SIGCONT) 
  
    # Get the child's pid and  
    # status code using 
    # os.waitpid() method 
    info = os.waitpid(pid, os.WCONTINUED) 
  
    # info is a tuple 
    # info[0] represents child's pid 
    # info[1] represents exit status code 
  
    print("\nIn parent process") 
      
    # Check whether the child process 
    # has been continued  
    # from a job control stop or not     
    # using os.WIFCONTINUED() method 
    continued = os.WIFCONTINUED(info[1])  
  
    print("Has child process been continued from a job control stop?") 
    print(continued) 
  
  
else : 
  
    print("In Child process") 
    print("Process ID:", os.getpid()) 
    print("Hello ! Geeks") 
         
 
  

Output:

  In Child process  Process ID: 12371  Hello! Geeks    In parent process  Has child process been continued from a job control stop?  True

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

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