Python | os.WIFSTOPPED () method

Michael Zippo

os.WIFSTOPPED() in Python is used to check if a process has stopped. This method accepts the process status code returned by os.wait() , os.system () or os.waitpid() as a parameter and returns True if the process was stopped , otherwise it returns False.

Syntax: os.WIFSTOPPED (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 stopped, otherwise returns False.

Code: using the os.WIFSTOPPED ( )

# Python program to explain the os.WIFSTOPPED () method

# OS and signal module import

import os, signal

# Create a child process
# using the os.fork () method

pid = os.fork ()

# pid large e 0
# refers to the parent process

if pid:

# Send signal & # 39; SIGSTOP & # 39;

# child process

# using the os.kill () method

# the signal will call the child

# stop the process

os. kill (pid, signal.SIGSTOP)

# Get the child’s pid and

# status code using

    # os. waitpid () method  
    info   =   os.waitpid (pid, os.WSTOPPED) 
   
    # info is a tuple  
    # info [0] represents the child’s pid  
    # info [1] represents the exit status code  
   
    print   (  "In parent process"  ) 
   
     # Checking the child process  
     # was stopped or not  
     # using the os.WIFSTOPPED () method  
    isStopped   =   os.WIFSTOPPED (info [  1  ]) 
   
    print   (  "Has child process been stopped?"  ) 
    print   (isStopped) 
   
   
   else < / code> : 
    print   (  "In Child process"  ) 
    print   (  "Process ID: " , os.getpid ()) 
     print   ( " Hello! Geeks " )

Exit :

 In Child process Process ID: 10224 Hello! Geeks In parent process Has child process been stopped ? True

Links: https://docs.python.org/3/library/os.html#os.WIFSTOPPED

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Python | os.WIFSTOPPED () method

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