Devices                                                  zero(7D)



NAME
     zero - source of zeroes

DESCRIPTION
     A zero special file is a source of zeroed unnamed memory.


     Reads from a zero special file always return a  buffer  full
     of zeroes. The file is of infinite length.


     Writes to a zero special file are always successful, but the
     data written is ignored.


     Mapping a  zero  special  file  creates  a  zero-initialized
     unnamed memory object of a length equal to the length of the
     mapping and rounded up to the nearest page size as  returned
     by sysconf. Multiple processes can share such a zero special
     file object provided a common  ancestor  mapped  the  object
     MAPSHARED.

FILES
     /dev/zero


SEE ALSO
     fork(2), mmap(2), sysconf(3C)



























SunOS 5.11           Last change: 3 Jul 1990                    1