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Share a small example of signal processing in php

藏色散人

Release： 2023-04-10 20:00:01

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Our commonly used signals

kill sigterm sigkill【kill command】
ctrl c sigint [issued by keyboard]
reload sinhub [generally issued from terminal]
ctrl z sigstop [issued by keyboard]
Timer sigalarm [A process can only have one timing time, more will be overwritten by new values]

sigkill and sinstop are performing signal processing When, it cannot be ignored (signal processing can be ignored, and user-specified processing is executed by default)

php signal small example

<?php
        function sighandler($signo){
                echo 'just for sigint',"\n";

        }

        function sighandler2($signo){

                echo 'just for sigquit',"\n";
        }
        declare(ticks=1);

        pcntl_signal(SIGINT,"sighandler");

        pcntl_signal(SIGQUIT,"sighandler2");
        for($i=1;$i<30;$i++){
                file_put_contents('/home/tbtest/out.txt',"$i"."秒\n");
                sleep(1);
        }

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Execution result

root@lyh:/home/tbtest# php sigint.php 
^Cjust for sigint
^Cjust for sigint
^Cjust for sigint
just for sigquit
^Cjust for sigint
^Cjust for sigint
^Z
[1]+  Stopped                 php sigint.php
root@lyh:/home/tbtest# bg
[1]+ php sigint.php &
root@lyh:/home/tbtest# fg
php sigint.php
root@lyh:/home/tbtest# cat out.txt 
29秒
root@lyh:/home/tbtest#

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About capturing sigquit

I captured jsut for sigquit above because I set up another terminal,

root@lyh:~# ps -aux |grep php                                    
root     16385  0.5  1.9 377720 19468 pts/2    S+   15:09   0:00 php sigint.php
root     16390  0.0  0.0  11744   932 pts/0    S+   15:09   0:00 grep --color=auto php
root@lyh:~# kill -s sigquit 16385

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ps: pcntl_signal_dispatch is more efficient than ticks

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