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zero(7)
NAME
  zero - source of zeroes

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

FILES
  /dev/zero

SEE ALSO
  Functions: fork(2), mmap(2), sysconf(3).