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

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

youdao

这些信息的集合构成了段描述符。

Together this information forms a segment descriptor.

youdao

更新段寄存器时，与其相应的段描述符必须在核心内存中修改，然后重新载入段寄存器。

In order to update a segment register, the corresponding segment descriptor must be modified in kernel memory and then reloaded into the segment register.

youdao