A client can attach the Shared memory region created by the server.

某个客户机连接到服务器所创建的共享内存区域。

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Shm_open : Creates a Shared memory region or attaches to an existing, named region.

shm_open：创建共享内存段或连接到现有的已命名内存段。

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shm_unlink(): Deletes a shared memory region given a file descriptor (returned from shm_open()).

shm_unlink()：根据（shm_open() 返回的）文件描述符，删除共享内存段。

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