Python os.WIFCONTINUED()用法及代碼示例

Python中的OS模塊提供了與操作係統進行交互的函數。操作係統屬於Python的標準實用程序模塊。該模塊提供了使用依賴於操作係統的函數的便攜式方法。

os.WIFCONTINUED()Python中的方法用於檢查從作業控製停止是否繼續執行某個過程。此方法采用流程狀態代碼，由os.wait()，os.system()或者os.waitpid()方法作為參數，如果進程已停止，則返回True，否則返回False。

用法： os.WIFCONTINUED(status)

參數：
status:此參數采用os.system()，os.wait()方法或os.waitpid()方法返回的過程狀態代碼(整數值)。

返回類型：此方法返回“布爾”類的布爾值。如果從作業控製停止處繼續執行該過程，則此方法返回True，否則返回False。

代碼:用於os.WIFCONTINUED()方法

# Python program to explain os.WIFCONTINUED() 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:
      
    # Send signal 'SIGSTOP' 
    # to child process 
    # using os.kill() method 
    # signal 'SIGCONT' will cause 
    # the child process to stop 
    os.kill(pid, signal.SIGSTOP) 
  
    # Send signal 'SIGCONT' 
    # to child process 
    # using os.kill() method 
    # SIGCONT signal will cause 
    # the child process to continue 
    os.kill(pid, signal.SIGCONT) 
  
    # Get the child's pid and  
    # status code using 
    # os.waitpid() method 
    info = os.waitpid(pid, os.WCONTINUED) 
  
    # info is a tuple 
    # info[0] represents child's pid 
    # info[1] represents exit status code 
  
    print("\nIn parent process") 
      
    # Check whether the child process 
    # has been continued  
    # from a job control stop or not     
    # using os.WIFCONTINUED() method 
    continued = os.WIFCONTINUED(info[1])  
  
    print("Has child process been continued from a job control stop?") 
    print(continued) 
  
  
else :
  
    print("In Child process") 
    print("Process ID:", os.getpid()) 
    print("Hello ! Geeks")

輸出：

In Child process
Process ID:12371
Hello! Geeks

In parent process
Has child process been continued from a job control stop?
True

參考文獻： https://docs.python.org/3/library/os.html#os.WIFCONTINUED

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注：本文由純淨天空篩選整理自ihritik大神的英文原創作品 Python | os.WIFCONTINUED() method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。