Question

我有一个脚本在我的linux服务器的后台运行，我想捕获像重启或任何会杀死这个脚本的信号，而是在实际退出之前保存任何importante信息。

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

如何抓住任何这些信号并让它执行退出功能，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);
}

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来注册信号处理程序，如下所示：

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.

Answer 2

的Perl：

@SIG{qw( INT TERM HUP )} = \&safe_exit;

无法抓住

SIGKILL。它不会被发送到该过程。

perlvar中记录了

%SIG。另请参阅perlipc

Answer 3

对于perl版本，请参阅perldoc -q signal - 基本上，将$SIG{signal}设置为子参考。

如何捕获KILL或HUP或用户中止信号？

3 个答案: