Python Linux signal programming signals, pythonsignals

Python Linux signal programming signals, pythonsignals
1. Signal Introduction

The Soft Interrupt signal (signal) is used to notify the process of an asynchronous event. Processes can call kill to send Soft Interrupt signals to each other. The kernel can also send a signal to the process due to internal events to notify the process of an event. Note that the signal is only used to notify a process of events and does not transmit any data to the process. Signal is a part of process control and a very important part in Linux programming.

• Signal allows asynchronous processing of events.
• The SIGKILL signal is being sent.Kill-9The signal generated.

• It is not difficult to use signal programming.

  EnterMan 7 signalView the type of signal:
  

2. programming example

The main steps for python programming are:
1) import the signal module.
2) Compile the signal processing function.
3) bind signals and signal processing functions.
4) processing signals

Use SIGINT as an example to compile sigtest. py. Then use "CTRL + C" to interrupt

#! /Usr/bin/env python #-*-coding: UTF-8-*-import signaldef ctrlc_handler (sig_num, frm): print "La la, you can't end my handler _^ "print" Init signal handler... "signal. signal (signal. SIGINT, ctrlc_handler) print "Done! "While True: pass

The result shows that our custom signal processing function is running.

Someone asked, What should I do if the program cannot end? Don't worry, usePsCommand to list the process list, find its PID, and Kill it.