zero(7)                DEVICES AND MODULES                zero(7)



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 writ-
     ten 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), sysconf(3C), mmap(2)



































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