Manual Pages for UNIX Operating System command usage for man null

Devices                                                  null(7D)



NAME
     null - the null file, also called the null device

SYNOPSIS
     /dev/null


DESCRIPTION
     Data written on the null special file,  /dev/null,  is  dis-
     carded.


     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)



























SunOS 5.11          Last change: 4 April 2001                   1