The zero special file is a source of zeroed 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 memory object of length equal to the length of the mapping and rounded up to the nearest allocation boundary as returned by sysconf(_SC_NUTC_OS_ALLOCGRANULARITY). Multiple processes can share such a zero special file object provided a common ancestor mapped the object MAP_SHARED.
PTC MKS Toolkit for Professional Developers
PTC MKS Toolkit for Professional Developers 64-Bit Edition
PTC MKS Toolkit for Enterprise Developers
PTC MKS Toolkit for Enterprise Developers 64-Bit Edition
PTC MKS Toolkit 10.3 Documentation Build 39.