xref: /titanic_52/usr/src/man/man7d/null.7d (revision 88b44bf4e73233af70877930178dbff7f1c2992b)
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Copyright 1989 AT&T
Copyright (C) 2001, Sun Microsystems, Inc.
All Rights Reserved
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NULL 7D "Apr 4, 2001"
NAME
null - the null file, also called the null device
SYNOPSIS

/dev/null
DESCRIPTION

Data written on the null special file, /dev/null, is discarded.

Reads from a null special file always return 0 bytes.

Mapping a null special file creates an address reservation of a length equal to the length of the mapping, and rounded up to the nearest page size as returned by sysconf(3C). No resources are consumed by the reservation. Mappings can be placed in the resulting address range via subsequent calls to mmap with the -MAP_FIXED option set.

FILES
/dev/null

SEE ALSO

mmap(2), sysconf(3C)