Ian Campbell writes ("Re: [Xen-devel] [PATCH XEN v6 25/32] tools/libs/gnttab:
Extensive updates to API documentation."):
> So I think at least call, foreignmemory and gnttab need a
> restriction/caveat like the above, which is that on fork but not exec you
> can call close() and hope it does something, but unmap is off the table.
Hrm, right.
(This all seems rather unsatisfactory but I guess it's where we are.
ISTM that part of what's needed is a version of MADV_DONTFORK which
causes children to get a mapping of nothing, with PROT_NONE, for the
relevant ranges. Then you could safely munmap.)
Ian.
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