hpux man page for zero

zero(7) 						 Miscellaneous Information Manual						   zero(7)

NAME
       zero - /dev/zero special file

DESCRIPTION
       is a zero special file.	Reads from a zero special file always return characters whose value is 0 ( characters).

       Data written on a zero special file is discarded or ignored.

       Seeks on a zero special file always succeed.

       When  is  memory  mapped  by calling the associated memory object behaves as a object. It is initialized to all zeros. Writes to the object
       modify the contents of the object which are observed by subsequent reads to this object.

       Both and are allowed.

       When it is mapped shared, the memory object can be shared only with the descendants of the  current  process.  Modifications  made  to  the
       object are visible only to the process and its descendants.

       When it is mapped private, any modifications done after are visible only to the process.

EXAMPLES
       In the following example, the buffer is filled with  characters.

       In the following example, the process now has a range of  characters at memory location

FILES
SEE ALSO
       mmap(2), null(7).

																	   zero(7)