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→/proc/$PID/map_files/
FIXME how
FIXME how
HOW: The same technique as with memfd is used, with two exceptions. First is that creator calls mmap()
not memfd_create() and creates the shared memory at once. Then it waits for the others to open its
/proc/pid/map_files/ link. After opening "the others" mmap() one to their address space just as if
they would have done it with memfd descriptor.
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