共享内存C ++ – PHP

我正在尝试在C ++应用程序中创build共享内存段。然后在网页上阅读。

C ++应用程序将是服务器。我的testing代码在这个页面上使用shm_client.c示例。

C ++代码：

key = 6565; if( (shmid = shmget( key, 27, IPC_CREAT | 0666 )) < 0 ) throw std::string( "shmget failed." ); if( (data = shmat( shmid, NULL, 0 )) < 0 ) throw std::string( "shmat failed" ); memset( data, 0, 27 ); strncpy( (char *)data, "Hello world", 27 );

我将shm_client.c中的密钥更改为6565.而且它工作正常。

问题出在我的PHP文件中。

 <html> <body> <p>Hej</p> <?php ini_set('display_errors',1); ini_set('display_startup_errors',1); error_reporting(-1); $shm_id = shmop_open( 6565, "a", 0, 0 ); echo "Id: " . $shm_id . "<br />"; echo "Size: " . shmop_size( $shm_id ) . "<br />"; $data = shmop_read( $shm_id, 0, 27 ); echo "Data: " . $data . "<br />"; ?> </body> </html>

这输出：

 Hej Warning: shmop_open(): unable to attach or create shared memory segment in /var/www/html/secure/ctrl.php on line 8 Id: Warning: shmop_size(): no shared memory segment with an id of [0] in /var/www/html/secure/ctrl.php on line 10 Size: Warning: shmop_read(): no shared memory segment with an id of [0] in /var/www/html/secure/ctrl.php on line 12 Data:

phpinfo（）告诉我，我已经安装了PHP 5.3.3版本。服务器正在运行centos 6。