NULL(4D) Devices NULL(4D)

NAME

null - the null file, also called the null device

SYNOPSIS

/dev/null

DESCRIPTION

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.

FILES

/dev/null

SEE ALSO

mmap(2), sysconf(3C)

April 4, 2001 NULL(4D)