Question with the difference in shm_info between Linux and Cygwin

[Kun Yang]

Greetings,

I attempted to get the information about shared memory. Then I noticed some
difference in shm_info. I have some question about it.

Firstly, I would like to know is there any reason why shm_rss and shm_swp
doesn't exist? And how to get them? Additionally, is shm_atts the same as
shm_rss?

I would also like to inquire if swap_attempts and swap_successes the same in
Linux and Cygwin, always being zero and unused?

I would appreciate it if you could offer some related information.

Best Regards,
Yang Kun