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PHP. Руководство по PHP. 2005

shmop_openПред. След.

shmop_open

Description

shmop_open() can create or open a shared memory block.

shmop_open() takes 4 parameters: key, which is the system's id for the shared memory block, this parameter can be passed as a decimal or hex. The second parameter are the flags that you can use:

• "a" for access (sets SHM_RDONLY for shmat) use this flag when you need to open an existing shared memory segment for read only

• "c" for create (sets IPC_CREATE) use this flag when you need to create a new shared memory segment or if a segment with the same key exists, try to open it for read and write

• "w" for read & write access use this flag when you need to read and write to a shared memory segment, use this flag in most cases.

• "n" create a new memory segment (sets IPC_CREATE|IPC_EXCL) use this flag when you want to create a new shared memory segment but if one already exists with the same flag, fail. This is useful for security purposes, using this you can prevent race condition exploits.

Замечание: Note: the 3rd and 4th should be entered as 0 if you are opening an existing memory segment. On success shmop_open() will return an id that you can use to access the shared memory segment you've created.

Пример 1. Create a new shared memory block <?php $shm_key = ftok(__FILE__, 't'); $shm_id = shmop_open($shm_key, "c", 0644, 100); ?>

This example opened a shared memory block with a system id returned by ftok().

Пред. Начало След. shmop_delete Уровень выше shmop_read

Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.