Differences with FreeBSDAs expected, OpenBSD implementation is very similar to FreeBSD's (which was already in place), that is why I decided to merge most of it in a single C file (_psutil_bsd.c) and use 2 separate C files for when the two implementations differed too much: freebsd.c and openbsd.c. In terms of functionality here's the differences with FreeBSD. Unless specified, these differences are due to the kernel which does not provide the information natively (meaning we can't do anything about it).
- Process.memory_maps() is not implemented. The kernel provides the necessary pieces but I didn't do this yet (hopefully later).
- Process.num_ctx_switches()'s involuntary field is always 0. kinfo_proc provides this info but it is always set to 0.
- Process.cpu_affinity() (get and set) is not supported.
- Process.exe() is determined by inspecting the command line so it may not always be available (return None).
- psutil.swap_memory() sin and sout (swap in and swap out) values are not available and hence are always set to 0.
- psutil.cpu_count(logical=False) always return None.
Similarly to FreeBSD, also OpenBSD implementation of Process.open_files() is problematic as it is not able to return file paths (FreeBSD can sometimes). Other than these differences the functionalities are all there and pretty much the same, so overall I'm pretty satisfied with the result.