Python os.WTERMSIG()用法及代码示例

# 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()

# 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 
        # represnts 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()