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)