[Bug 270810] munmap does not always sync the underlying file

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270810

--- Comment #2 from geoffrey@dommett.com ---
Well, most writes are updated on the server, (and all seem to be if the program
performs other activity before exiting) but pages get randomly missed if the
program exits soon after ther writes. Not guaranteeing the writes seems
completely against the posix standard which states:
The mmap() function adds an extra reference to the file associated with the
file descriptor fildes which is not removed by a subsequent close() on that
file descriptor. This reference is removed when there are no more mappings to
the file.

Also see this stackoverflow question 
https://stackoverflow.com/questions/17490033/do-i-need-to-keep-a-file-open-after-calling-mmap-on-it

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