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Manual page for ZERO(4S)

zero - source of zeroes


None; included with standard system.


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.




fork.2v getpagesize.2 mmap.2

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Created by unroff & hp-tools. © by Hans-Peter Bischof. All Rights Reserved (1997).

Last modified 21/April/97