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.WTERMSIG() method in Python is used to get the signal number which caused the process to exit. This method takes process status code as returned by os.wait(), os.system() or os.waitpid() method as a parameter.
Syntax: os.WTERMSIG(status)
Parameters:
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 an integer value which represent the signal number which caused the process to exit.
Code #1: Use of os.WTERMSIG() method
Python3
# Python program to explain os.WTERMSIG() 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 : # Wait for the completion of # the child process and get # its pid and # exit status indication info = os.wait() # info is a tuple # info[0] represents child's id # info[1] represents exit status code print("\nIn parent process") # Get the signal number which caused # the child process to exit sig_num = os.WTERMSIG(info[1]) print("Child process exited due to signal no:", sig_num ) # We can get the signal name # corresponding to the signal number # in following way print("Signal name:", signal.Signals(sig_num).name)else : print("In Child process") print("Process ID:", os.getpid()) print("Hello ! Geeks") # os.abort() method will # generate a SIGABRT signal # to the current process # and will produce core dump. os.abort() |
In Child process Process ID: 3421 Hello! Geeks In parent process Child process exited due to signal no: 6 Signal name: SIGABRT
Code #2: Use of os.WTERMSIG() method
Python3
# Python program to explain os.WTERMSIG() 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 : # Create one more child pid2 = os.fork() if pid2 : # Wait for the completion of # first child process and get # its pid and # exit status indication # using os.waitpid() method child1_info = os.waitpid(pid, 0) # Wait for the completion of # second child process and get # its pid and exit status indication # using os.waitpid() method child2_info = os.waitpid(pid2, 0) # os.waitpid() method # returns a tuple which # represents child's pid # and exit status code print("\nIn parent process") # Get the signal number which caused # first child process to exit sig_num = os.WTERMSIG(child1_info[1]) if sig_num != 0 : print("First child process exited due to signal no:", sig_num ) print("Signal name:", signal.Signals(sig_num).name) else: print("First child exited normally") # Get the signal number which caused # second child process to exit sig_num = os.WTERMSIG(child2_info[1]) if sig_num != 0 : print("Second child process exited due to signal no:", sig_num ) print("Signal name:", signal.Signals(sig_num).name) else: print("Second child exited normally") # sig_num equal to 0 represents # that no signal caused # the process to exit 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") # os.abort() method will # generate a SIGABRT signal # to the current process os.abort() |
In First child process Process ID: 3752 Hello! Geeks In second child process Process id: 3753 Hey! there Exiting.. In parent process First child process exited due to signal no: 6 Signal name: SIGABRT Second child exited normally
References: https://docs.python.org/3/library/os.html#os.WTERMSIG
