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#!/bin/env php
<?php
/** A example denoted muti-process application in php
* @filename fork.php
* @touch date Wed 10 Jun 2009 10:25:51 PM CST
* @author Laruence<laruence@baidu.com>
* @license http://www.zend.com/license/3_0.txt   PHP License 3.0
* @version 1.0.0
*/
/** 确保这个函数只能运行在SHELL中 */
if (substr(php_sapi_name(), 0, 3) !== 'cli') {
    die("This Programe can only be run in CLI mode");
}
/**  关闭最大执行时间限制, 在CLI模式下, 这个语句其实不必要 */
set_time_limit(0);
$pid  = posix_getpid(); //取得主进程ID
$user = posix_getlogin(); //取得用户名
echo <<<EOD
USAGE: [command | expression]
input php code to execute by fork a new process
input quit to exit
        Shell Executor version 1.0.0 by laruence
EOD;
while (true) {
        $prompt = "\n{$user}$ ";
        $input  = readline($prompt);
        readline_add_history($input);
        if ($input == 'quit') {
      break;
    }
        process_execute($input . ';');
}
exit(0);
function process_execute($input) {
        $pid = pcntl_fork(); //创建子进程
        if ($pid == 0) {//子进程
                $pid = posix_getpid();
                echo "* Process {$pid} was created, and Executed:\n\n";
                eval($input); //解析命令
                exit;
        } else {//主进程
                $pid = pcntl_wait($status, WUNTRACED); //取得子进程结束状态
                if (pcntl_wifexited($status)) {
                        echo "\n\n* Sub process: {$return['pid']} exited with {$status}";
                }
        }
}