[net.unix] 4.2BSD Memory management primitives availability.

SFLEISCHMAN@USC-ECLB.ARPA (04/09/85)

We just installed a release of 4.2BSD on our VAX dated Nov 2, 1983. and 
were disappointed to find that the memory management primitives, apparently,
are not available for programmer use (mmap, mremap, munmap, mprotect, etc.).
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