zero man page on DigitalUNIX

zero man page on DigitalUNIX

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zero(7)								       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 remap‐
       ping of currently mapped pages.

FILES
       /dev/zero

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

								       zero(7)

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