[英]If I have a Python script I started in PHP from a web server, how do I stop it?
I have an Apache Web server on my RaspberryPi 4 that has a program written in Python on it that will turn on an 8x8 matrix of red led's.我的 RaspberryPi 4 上有一个 Apache Web 服务器,上面有一个用 Python 编写的程序,它将打开一个 8x8 矩阵。 I have a HTML and PHP page on the web server so I can remotely execute that script.
我在 web 服务器上有一个 HTML 和 PHP 页面,因此我可以远程执行该脚本。 The HTML is just 2 buttons and on the press of the button it goes to this PHP program:
HTML 仅有 2 个按钮,按下按钮即可进入此 PHP 程序:
<?php
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);
if ($_SERVER['REQUEST_METHOD'] == "POST" and isset($_POST['on']))
{
lightOn();
} elseif ($_SERVER['REQUEST_METHOD'] == "POST" and isset($_POST['off']))
{
lightOff();
}
function lightOn()
{
$command = escapeshellcmd('sudo python3 led_display.py');
$output = shell_exec($command);
header('Location: index.html');
exit;
}
function lightOff()
{
$command = escapeshellcmd('');
$output = shell_exec($command);
header('Location: index.html');
exit;
}
?>
This PHP program just recognizes which of the 2 buttons was pressed and on the press executes a function.此 PHP 程序仅识别按下了 2 个按钮中的哪一个,并在按下时执行 function。 For the lightOn() function it is simple as I just execute the script that drives the 8x8 led matrix.
对于 lightOn() function 这很简单,因为我只需执行驱动 8x8 LED 矩阵的脚本。 However I want the user to be able to stop the script at any time by pressing the other button.
但是我希望用户能够通过按下另一个按钮随时停止脚本。 On a normal command line interface I would type 'Control + c' to stop any running script.
在普通的命令行界面上,我会键入“Control + c”来停止任何正在运行的脚本。 How would I achieve that in PHP through shell_exec, or any other method?
我将如何通过 shell_exec 或任何其他方法在 PHP 中实现这一点?
In your server, find out what's the process id (PID) via ps
, top
or even htop
commands.在您的服务器中,通过
ps
、 top
甚至htop
命令找出进程 ID (PID) 是什么。 Than you can kill it with the command kill {pid_number}
.比你可以用命令
kill {pid_number}
杀死它。
Something like:就像是:
$ ps aux | grep led_display # the first number that appears is the PID. let's assume it's 1234
$ kill 1234
Assuming that you have control over the sudoers
file and know how to make it so your web-server process can execute the command referenced in lightOff
without a password you should be able to do假设您可以控制
sudoers
文件并知道如何制作它,以便您的网络服务器进程可以执行lightOff
中引用的命令,而无需密码,您应该能够做到
$command = escapeshellcmd('sudo pkill -TERM led_display.py');
Of course that would terminate ANY process called led_display.py
, not just the one you started from the web-server process.当然,这会终止任何名为
led_display.py
的进程,而不仅仅是您从 Web 服务器进程启动的进程。
EDIT:编辑:
What happens if you background the process?如果你在后台处理这个过程会发生什么?
$command = escapeshellcmd('sudo python3 led_display.py > /dev/null 2>&1 &');
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