php - 我如何捕获 KILL 或 HUP 或用户中止信号？

Question

我有一个脚本在我的 Linux 服务器的后台运行，我想捕获诸如重启之类的信号或任何会终止该脚本的信号，而不是在实际退出之前保存任何重要信息。

我认为我需要捕获的大部分内容是 SIGINT、SIGTERM、SIGHUP、SIGKILL。

如何捕捉这些信号并让它执行退出函数，否则继续执行它正在做的事情？

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);
}

伪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);
}
?>

Answer 1

PHP 使用 pcntl_signal注册一个信号处理程序，所以像这样:

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.