freebsd-dev/etc/defaults/devfs.rules

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#
# The following are some default rules for devfs(5) mounts.
# The format is very simple. Empty lines and lines begining
# with a hash '#' are ignored. If the hash mark occurs anywhere
# other than the beginning of a line, it and any subsequent
# characters will be ignored. A line in between brackets '[]'
# denotes the beginning of a ruleset. In the brackets should
# be a name for the rule and its ruleset number. Any other lines
# will be considered to be the 'action' part of a rule
# passed to the devfs(8) command. These will be passed
# "as-is" to the devfs(8) command with the exception that
# any references to other rulesets will be expanded first. These
# references must include a dollar sign '$' in-front of the
# name to be expanded properly.
#
# $FreeBSD$
#
# Very basic and secure ruleset: Hide everything.
# Used as a basis for other rules.
#
[devfsrules_hide_all=1]
add hide
# Basic devices typically necessary.
# Requires: devfsrules_hide_all
#
[devfsrules_unhide_basic=2]
add path null unhide
add path zero unhide
add path crypto unhide
add path random unhide
add path urandom unhide
# Devices typically needed to support logged-in users.
# Requires: devfsrules_hide_all
#
[devfsrules_unhide_login=3]
add path 'ptyp*' unhide
add path 'ptyq*' unhide
add path 'ptyr*' unhide
add path 'ptys*' unhide
add path 'ptyP*' unhide
add path 'ptyQ*' unhide
add path 'ptyR*' unhide
add path 'ptyS*' unhide
add path 'ttyp*' unhide
add path 'ttyq*' unhide
add path 'ttyr*' unhide
add path 'ttys*' unhide
add path 'ttyP*' unhide
add path 'ttyQ*' unhide
add path 'ttyR*' unhide
add path 'ttyS*' unhide
add path fd unhide
add path 'fd/*' unhide
add path stdin unhide
add path stdout unhide
add path stderr unhide
# Devices usually found in a jail.
#
[devfsrules_jail=4]
add include $devfsrules_hide_all
add include $devfsrules_unhide_basic
add include $devfsrules_unhide_login