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Data written on the null
special file, /dev/null, is discarded.
Reads from a null special file always return 0 bytes.
Mapping a null special file creates an address reservation of a length
equal to the length of the mapping, and rounded up to the nearest page size
as returned by sysconf(3C).
No resources are consumed by the reservation. Mappings can be placed in the
resulting address range via subsequent calls to mmap with
the -MAP_FIXED option set.
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