Python | os.WIFCONTINUED() method

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