怎么捕捉KILL、HUP或USER ABORT信号?

本教程将介绍如何捕捉KILL、HUP或USER ABORT信号?的处理方法,这篇教程是从别的地方看到的,然后加了一些国外程序员的疑问与解答,希望能对你有所帮助,好了,下面开始学习吧。

怎么捕捉KILL、HUP或USER ABORT信号? 教程 第1张

问题描述

我在Linux服务器的后台运行了一个脚本,我希望捕获诸如重新启动之类的信号或任何会杀死此脚本的信号,而不是在实际退出之前保存任何重要信息。

我想我需要捕捉的大部分是SIGINT、SIGTERM、SIGHUP、SIGKILL。

怎么捕获这些信号中的任何一个并使其执行退出函数,否则继续执行它正在执行的任何操作?

伪Perl代码:

#!/usr/bin/perl

use stricts;
use warnings;

while (true)
{
 #my happy code is running
 #my happy code will sleep for a few until its breath is back to keep running.
}

#ops I have detected an evil force trying to kill me
#let's call the safe exit.
sub safe_exit() 
{
 # save stuff
 exit(1);
}

php代码:

<?php

while (1)
{
 #my happy code is running
 #my happy code will sleep for a few until its breath is back to keep running.
}

#ops I have detected an evil force trying to kill me
#let's call the safe exit.

function safe_exit()
{
 # save stuff
 exit(1);
}
?>

推荐答案

PHP使用pcntl_signal注册信号处理程序,因此类似于:

declare(ticks = 1);

function sig_handler($sig) {
 switch($sig) {
  case SIGINT:
  # one branch for signal...
 }
}

pcntl_signal(SIGINT,  "sig_handler");
pcntl_signal(SIGTERM, "sig_handler");
pcntl_signal(SIGHUP,  "sig_handler");
# Nothing for SIGKILL as it won't work and trying to will give you a warning.

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