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0 Command: zero | Section: 7 | Source: Digital UNIX | File: zero.7.gz
zero(7) Miscellaneous Information Manual 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). delim off zero(7)

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