zero - source of zeroes
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.
Note that this version of the operating system does not support remapping of currently mapped pages.
Functions: fork(2), mmap(2), sysconf(3). delim off