源碼 signal_fun.php

<?php  
// 設(shè)置信號(hào)處理函數(shù)  
function signal_handler($signo) {  
    switch ($signo) {  
         case SIGTERM:  
             // 處理SIGTERM信號(hào)  
             tlog("Caught SIGTERM...exit...\n");  
             exit;  
             break;  
         case SIGHUP:  
             //處理SIGHUP信號(hào)  
             tlog("Caught SIGHUP...\n");  
             break;  
         case SIGUSR1:  
             tlog("Caught SIGUSR1...\n");  
             break;  
         default:  
             // 處理所有其他信號(hào)  
     }  
}  

// 寫日志  
function tlog($message, $print=1) {  
    $message = posix_getpid() . '_' . $message . "\n";  
    if ($print) {  
        echo $message;  
    } else {  
        error_log(posix_getpid() . '_' . $message . "\n", 3, '/var/www/log.log');  
    }  
}  

function _system($script) {  
    return system("/usr/local/php/bin/php /var/www/{$script} >> /var/www/system.log");  
}

源碼 main.php

<?php  
include_once './signal_fun.php';  
tlog('im start run');  
declare(ticks=1);  

// 開啟一個(gè)信號(hào)監(jiān)控  
pcntl_signal(SIGTERM, 'signal_handler');  

$myids = array();  
while(1) {  
    for ($i = 0; $i < 5; ++$i) {  
        $mypid =pcntl_fork();       // 開啟一個(gè)子進(jìn)程，子進(jìn)程和父進(jìn)程同時(shí)從此處向下執(zhí)行  
        if ($mypid < 0) {            // 子進(jìn)程啟動(dòng)失敗  
            tlog('fork error!');  
        } elseif ($mypid == 0) {    // 子進(jìn)程中，讀到的進(jìn)程id為0  
            tlog('im child!');  
            sleep(1000);            // 子進(jìn)程掛起   
            exit;  
        } else {                    // 父進(jìn)程讀到子進(jìn)程的pid  
            $myids[] = $mypid;  
            sleep(1);  
        }  
    }  

    sleep(10);  
    if ($myids) {  
        foreach ($myids as $key => $pid) {  
            tlog('kill '. $pid);  

            posix_kill($pid, SIGTERM);          // 傳遞信號(hào)，kill 子進(jìn)程  

            unset($myids);  

            sleep(2);  
        }  
    }  
}

完整的執(zhí)行結(jié)果是這樣

30834_im start run
30835_im child!
30836_im child!
30837_im child!
30838_im child!
30839_im child!
30834_kill 30835
30835_Caught SIGTERM...exit...

30834_kill 30836
30836_Caught SIGTERM...exit...

30834_kill 30837
30837_Caught SIGTERM...exit...

30834_kill 30838
30838_Caught SIGTERM...exit...

30834_kill 30839
30839_Caught SIGTERM...exit...

30860_im child!
30863_im child!
30866_im child!
30869_im child!
30872_im child!

先開啟5個(gè)子進(jìn)程，再殺死5個(gè)子進(jìn)程，再開啟...以此循環(huán)。

我想驗(yàn)證一下父進(jìn)程關(guān)閉后,因?yàn)樵趍ain.php中聲明了declare(ticks=1); 所以應(yīng)該子進(jìn)程時(shí)間到了之后關(guān)閉后,會(huì)自動(dòng)去產(chǎn)生信號(hào)SIGTERM,由此也可以出現(xiàn) 30839_Caught SIGTERM...exit...這種提示,但是現(xiàn)在出現(xiàn)的問題是這樣

# php main.php
2356_im start run
2357_im child!
2358_im child!
2359_im child!
2360_im child!
2361_im child!
^C
# kill -9 2357
-bash: kill: (2357) - 沒有那個(gè)進(jìn)程
# kill -9 2358
-bash: kill: (2358) - 沒有那個(gè)進(jìn)程
# kill -9 2359
-bash: kill: (2359) - 沒有那個(gè)進(jìn)程
# kill -9 2360
-bash: kill: (2360) - 沒有那個(gè)進(jìn)程
# kill -9 2361
-bash: kill: (2361) - 沒有那個(gè)進(jìn)程

ctrl+c關(guān)閉父進(jìn)程之后,子進(jìn)程沒有了...