This is often not true. Like the signature size will be sizeof(int [2]) ... because those are the mandatory parameters in the ioctl C struct ... but the datatype will include a variable array. Someone missed a memo.
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Anyway, if you want to learn Rust really deeply and get into the murky parts; set yourself the goal of setting and getting some ioctl()s!
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My RUST expertise is still in, if I need to touch syscalls or hardware bits, do it in C and bind it back out to RUST.
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