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.waitid() method in Python is used by a process to wait for completion of one or more child processes.
Syntax: os.waitid(idtype, id, options)
Parameters:
id: An integer value representing the process id of child to wait on.
idtype: The idtype and id parameter specify which child the method waits for.Return type: This method returns an object which represents the data contained in siginfo_t structure.
Code #1: Use of os.waitid() method
# Python program to explain os.waitid() 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.waitid() method
# Specify idtype
idtype = os.P_PID
# Specify id
id = pid
# Specify option
option = os.WEXITED
status = os.waitid(idtype, id, option)
print("\nIn parent process-")
# Print status
print("Status of child process:")
print(status)
else :
print("In Child process-")
print("Process ID:", os.getpid())
print("Hello ! Geeks")
print("Exiting..")
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Output:
In Child process- Process ID: 10309 Hello! Geeks Exiting.. In parent process- Status of child process: posix.waitid_result(si_pid=10309, si_uid=1000, si_signo=17, si_status=0, si_code=1)
Code #2: Use of os.waitid() method
# Python program to explain os.waitid() 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 :
# Create one more child process
pid2 = os.fork()
if pid2 :
# Wait for the completion of
# any child processes using
# os.waitid() method
# Specify idtype
idtype = os.P_ALL
# Specify id
# As idtype is os.P_ALL
# method will wait for
# any children and specified id
# is ignored.
id = pid
# Specify option
option = os.WSTOPPED | os.WEXITED
status = os.waitid(idtype, id, option)
print("\nIn parent process-")
# Print status
print("Status of completed child process:")
print(status)
else :
print("\nIn Second Child process-")
print("Process ID:", os.getpid())
print("Hey ! There ")
print("Exiting")
else :
print("In First Child process-")
print("Process ID:", os.getpid())
print("Hello ! Geeks")
print("Exiting")
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Output:
In First Child process- Process ID: 11524 Hello! Geeks Exiting In Second Child process- Process ID: 11525 Hey! There Exiting In parent process- Status of completed child process: posix.waitid_result(si_pid=11524, si_uid=1000, si_signo=17, si_status=0, si_code=1)
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