Python | método os.WTERMSIG()

El módulo OS en Python proporciona funciones para interactuar con el sistema operativo. OS viene bajo los módulos de utilidad estándar de Python. Este módulo proporciona una forma portátil de usar la funcionalidad dependiente del sistema operativo.
El método os.WTERMSIG() en Python se usa para obtener el número de señal que provocó la salida del proceso. Este método toma el código de estado del proceso devuelto por el método os.wait() , os.system() o os.waitpid() como parámetro.
 

Sintaxis: os.WTERMSIG(estado)
Parámetros:  
estado: este parámetro toma el código de estado del proceso (un valor entero) tal como lo devuelve el método os.system(), os.wait() o os.waitpid(). 
Tipo de devolución: este método devuelve un valor entero que representa el número de señal que provocó la salida del proceso. 
 

Código #1: Uso del método  os.WTERMSIG()
 

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()
Producción: 

In Child process
Process ID: 3421
Hello! Geeks

In parent process
Child process exited due to signal no: 6
Signal name: SIGABRT

 

Código #2: Uso del método  os.WTERMSIG()
 

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()
Producción: 

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

 

Referencias: https://docs.python.org/3/library/os.html#os.WTERMSIG
 

Publicación traducida automáticamente

Artículo escrito por ihritik y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA

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