NAME    [Toc]    [Back]

       zero - source of zeroes

DESCRIPTION    [Toc]    [Back]

       This  is a special file that provides a means of obtaining
       zeroes.  A read from a zero special file returns a  buffer
       full  of zeroes.  This file is of infinite length.  Writes
       to a zero special file succeed at all times, but the  data
       written is ignored.

       If  you  choose to map to a zero special file, a zero-initialized
 unnamed memory  object  is  created  that  is  of
       length  equal to the mapping and rounded up to the nearest
       page size returned by the sysconf function.

       A zero special file object can be shared by  several  processes
  as long as a common ancestor has mapped the object
       as MAP_SHARED.

NOTES    [Toc]    [Back]

       Note that this version of the operating  system  does  not
       support remapping of currently mapped pages.

FILES    [Toc]    [Back]

       /dev/zero

SEE ALSO    [Toc]    [Back]

       Functions: fork(2), mmap(2), sysconf(3)



                                                          zero(7)