* Adalbert Lazăr:
>>> - the control plane accepts three ioctls
>>>
>>> PIDFD_MEM_MAP takes a struct like
>>>
>>> struct pidfd_mem_map {
>>> uint64_t address;
>>> off_t offset;
>>> off_t size;
>>> int flags;
>>> int padding[7];
>>> }
>>>
>>> After this is done, the memory access fd can be mmap-ed at range
>>> [offset,
>>> offset+size), and it will read memory from range [address,
>>> address+size) of the target descriptor.
>>>
>>> PIDFD_MEM_UNMAP takes a struct like
>>>
>>> struct pidfd_mem_unmap {
>>> off_t offset;
>>> off_t size;
>>> }
>>>
>>> and unmaps the corresponding range of course.
off_t depends on preprocessor macros (_FILE_OFFSET_BITS), so these
types should be uint64_t, too.
I'm not sure what the advantage is of returning separate file
descriptors, and nit operating directly on the pidfd.
