ZERO(7)								       ZERO(7)

NAME    [Toc]    [Back]

     zero - source of zeroes

DESCRIPTION    [Toc]    [Back]

     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 getpagesize(2).  Multiple processes
     can share such a zero special file	object provided	a common ancestor
     mapped the	object MAP_SHARED.

FILES    [Toc]    [Back]

     /dev/zero

SEE ALSO    [Toc]    [Back]

     fork(2), mmap(2)


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