Content-type: text/html Man page of null

null

Section: Devices (7D)
Updated: 4 April 2001
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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)


 

Index

NAME
SYNOPSIS
DESCRIPTION
FILES
SEE ALSO

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Time: 02:39:59 GMT, October 02, 2010