In some cases, you can also map a file descriptor to a plain file or another device into memory.

在某些情况下，还可以把一般文件或另一个设备的文件描述符映射到内存。

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This system call requires the file descriptor from shm_open and returns a pointer to memory.

这个系统调用需要shm_open返回的文件描述符，它返回指向内存的指针。

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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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