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by remix2000 150 days ago
Ioctls are the single most complex example for API design, cause like, that's another opaque interface inside one opaque interface. Ioctls will be routed to the desired kernel module (driver) depending on the FD, after all.

Basically all I'm saying is that a syscall "ABI" is but a red herring for everyone but the [mainline] Linux devs themselves.