使用PHP脚本来写Daemon程序(4)

                $signal_flag = TRUE;

            }

            break;

        case SIGALRM:

            print date('y-m-d H:i:s', time() ) . " Caught Signal : SIGALRM - No : $signal \n";

            //pcntl_exec( '/bin/ls' );

            pcntl_alarm( 5 );

            break;

        default:

            break;

    }

}

function AutoStart( $signal = FALSE, $filename = 'config.php' ){

    global $init_md5;

    if( $signal || md5_file( $filename ) != $init_md5 ){

        print "The config file has been changed, we are going to restart. \n";

        $pid = pcntl_fork();

        if( $pid == -1 ){

            print "Fork error \n";

        }else if( $pid > 0 ){

            print "Parent exit \n";

            exit(0);

        }else{

            $init_md5 = md5_file( $filename );

            print "Child continue to run \n";

        }

    }

}