To finish, the originating process calls munmap and shm_unlink , and then exits.
当使用完时，原来的进程调用munmap和shm_unlink，然后退出。
The munmap subroutine only unmaps regions created from calls to the mmap subroutine.
munmap子例程只是取消 对mmap 子例程的调用而创建的区域的映射。
The munmap subroutine only unmaps regions created from calls to the mmap subroutine.
munmap子例程只是取消 对mmap 子例程的调用而创建的区域的映射。
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