Use of __kernel_timespec in userspace genetlink API
mdlayher at gmail.com
Thu Apr 18 16:06:17 CEST 2019
I recently received a bug report for
https://github.com/mdlayher/wireguardctrl which indicated that the
timespec structure being returned from the WireGuard genetlink API was
not of the expected size on a 32-bit machine.
It then occurred to us that the userspace-facing API is returning a
"__kernel_timespec"; something I did not realize before:
My C experience is very limited, and I have no experience working on C
within the kernel, but is exposing a "__kernel*" type to userspace a
normal procedure? I would have expected to see a regular timespec from
linux/time.h, or perhaps a timespec64 in its place.
I can do some slightly more intelligent checking to fix the current
issue with my library, but I wanted to check in and confirm that this
API contract is correct.
Thanks for your time!
- Matt Layher
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