[Bug 232878] File sealing

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232878

--- Comment #3 from contact at emersion.fr ---
Some more information on the flag from Mark Kettenis:

> The flag is called __MAP_NOFAULT.  It is somewhat deliberately
> undocumented as we didn't want to encourage people too much to use it.
> 
> The flag gets translated into UVM_ET_NOFAULT in OpenBSD's vm
> subsystem.  The idea is that if the pages backing the mapping are not
> available (i.e. if a file got truncated) it will be replaced with
> anonymous zero-filled memory.  In other words, if the mapped data for
> a specific memory page isn't available it would behave as if the page
> was mapped with the MAP_ANON flag.

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