NULL(7D) Devices NULL(7D)
null - the null file, also called the null device
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
SEE ALSO mmap(2)
April 4, 2001 NULL(7D)