Python | os.wait() 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.wait() method in Python is used by a process to wait for completion of a child process.
This method returns a tuple containing its PID and exit status indication. The exit status of child process is indicated by a 16 bit number whose lower byte is the signal number that killed the process and higher byte is the exit status (if the signal number is zero).

Syntax: os.wait()

Parameter: No parameter is required.

Return type: This method returns a tuple which contains terminated child’s PID and exit status indication.

Code: Use of os.wait() method

# Python program to explain os.wait() method  
  
# importing os module   
import os  
  
# Create a child process 
# using os.fork() method  
pid = os.fork() 
  
  
# a Non-zero process id (pid) 
# indicates the parent process  
if pid : 
      
    # Wait for the completion of 
    # child process using 
    # os.wait() method     
    status = os.wait() 
    print("\nIn parent process-") 
    print("Terminated child's process id:", status[0]) 
    print("Signal number that killed the child process:", status[1]) 
  
else : 
    print("In Child process-") 
    print("Process ID:", os.getpid()) 
    print("Hello ! Geeks") 
    print("Exiting") 
      
  
# using os.wait() method     
# Parent process will wait till  
# the completion of child process 
# and then only it will  
# begin its execution 

Output:

In Child process-
Process ID: 6276
Hello! Geeks
Exiting

In parent process-
Terminated child's process id: 6276
Signal number that killed the child process: 0

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