PHP進程訊號處理

不言原創: 2018-05-02 09:10:252056瀏覽

這篇文章主要介紹了關於PHP進程訊號處理，有著一定的參考價值，現在分享給大家，有需要的朋友可以參考一下

<?php
while (1)
 {
     echo "I am doing something important\n";    
     echo "If i am interruptted, the data will be corrupted\n";    
     echo "Be careful\n";    
     echo "\n\n";
    sleep(5);
}

假設現在有以上這麼一個PHP腳本，我們想要腳本在收到SIGINT、SIGTERM等進程訊號時，輸出一段訊息並結束腳本，該如何實現？

使用pcntl_signal和pcntl_signal_dispatch函數即可（注意PHP需要安裝pcntl擴充功能才能使用這兩個函數），請參閱程式碼：

<?php/**
 * 信号ID和信号名称对应关系，没注释掉的信号都是可以通过pcntl_signal函数注册的
 */
 $GLOBALS[&#39;G_SIG_MAP&#39;] = array(
     1 => &#39;SIGHUP&#39;,    
     2 => &#39;SIGINT&#39;,    
     3 => &#39;SIGQUIT&#39;,    
     4 => &#39;SIGILL&#39;,    
     5 => &#39;SIGTRAP&#39;,    
     6 => &#39;SIGABRT&#39;,    
     7 => &#39;SIGEMT&#39;,    
     8 => &#39;SIGFPE&#39;,    
     //9 => &#39;SIGKILL&#39;,
    10 => &#39;SIGBUS&#39;,    
    11 => &#39;SIGSEGV&#39;,    
    12 => &#39;SIGSYS&#39;,    
    13 => &#39;SIGPIPE&#39;,    
    14 => &#39;SIGALRM&#39;,    
    15 => &#39;SIGTERM&#39;,    
    16 => &#39;SIGURG&#39;,    
    //17 => &#39;SIGSTOP&#39;,
    18 => &#39;SIGTSTP&#39;,    
    19 => &#39;SIGCONT&#39;,    
    20 => &#39;SIGCHLD&#39;,    
    21 => &#39;SIGTTIN&#39;,    
    22 => &#39;SIGTTOU&#39;,    
    23 => &#39;SIGIO&#39;,    
    24 => &#39;SIGXCPU&#39;,    
    25 => &#39;SIGXFSZ&#39;,    
    26 => &#39;SIGVTALRM&#39;,    
    27 => &#39;SIGPROF&#39;,    
    28 => &#39;SIGWINCH&#39;,    
    29 => &#39;SIGINFO&#39;,    
    30 => &#39;SIGUSR1&#39;,    
    31 => &#39;SIGUSR2&#39;,
);
/**
 * 进程信号处理函数
 * @param int $signo 信号ID
 */function signalHandler($signo) {
    if (isset($GLOBALS[&#39;G_SIG_MAP&#39;][$signo])) {  
    echo "Caught signal {$GLOBALS[&#39;G_SIG_MAP&#39;][$signo]}, exit\n";
    } else {      
              echo "Caught unknown signal:$signo";
    }    
    exit();
}foreach ($GLOBALS[&#39;G_SIG_MAP&#39;] as $id => $name) {
    pcntl_signal($id, &#39;signalHandler&#39;);
}while (1) {
                echo "I am doing something important\n";    
                echo "If i am interruptted, the data will be corrupted\n";    
                echo "Be careful\n";    echo "\n\n";
    pcntl_signal_dispatch(); // 此函数调用必须放在循环体内
    sleep(5);
}

PHP進程訊號處理
#在linux shell中執行該功能腳本，然後使用kill -2 腳本進程ID命令向進程發送訊號，腳本正常輸出訊息並退出。

PHP進程訊號處理

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