dragonfly/etc/rc.subr

# $NetBSD: rc.subr,v 1.49 2002/05/21 12:31:01 lukem Exp $
# $FreeBSD: head/etc/rc.subr 275359 2014-12-01 12:17:42Z des $
#
# Copyright (c) 1997-2002 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Luke Mewburn.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
#        This product includes software developed by the NetBSD
#        Foundation, Inc. and its contributors.
# 4. Neither the name of The NetBSD Foundation nor the names of its
#    contributors may be used to endorse or promote products derived
#    from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# rc.subr
#	functions used by various rc scripts
#

#
#	Operating System dependent/independent variables
#

if [ -z "$_file" ]; then
	_file="$0"
fi
provide_list=`rcorder -p $_file`

if [ -n "${_rc_subr_loaded}" ]; then
	return
fi

_rc_subr_loaded="YES"

SYSCTL="/sbin/sysctl"
SYSCTL_N="${SYSCTL} -n"
CMD_OSTYPE="${SYSCTL_N} kern.ostype"
OSTYPE=`${CMD_OSTYPE}`

RC_RUNNING=0
RC_FAILED=1
RC_DISABLED=2
RC_IRRELEVANT=3
RC_CONFIGURED=4
RC_STOPPED=5
SYSCTL_W="${SYSCTL}"

#
#	functions
#	---------

# list_vars pattern
#	List vars matching pattern.
#
list_vars()
{
	set | { while read LINE; do
		var="${LINE%%=*}"
		case "$var" in
		"$LINE"|*[!a-zA-Z0-9_]*) continue ;;
		$1) echo $var
		esac
	done; }
}

# set_rcvar base_var
#	Set the variable name enabling a specific service.
#	FreeBSD uses ${service}_enable, while NetBSD uses
#	just the name of the service. For example:
#	FreeBSD: sendmail_enable="YES"
#	NetBSD : sendmail="YES"
#	$1 - if $name is not the base to work of off, specify
#	     a different one
#
set_rcvar()
{
	if [ -z "$1" ]; then
		base_var=${name}
	else
		base_var="$1"
	fi

	echo ${base_var}
}

# set_provide_list
#
#	$1	should be $rc_arg (start, stop, restart, reload, etc)
#	$2	return value $RC_*
#
#	Set the rcng_* variables associated with elements in provide_list
#	based on $1 and $2.
#
#	Returns non-zero when early termination should occur, in which
#	case the caller should return with a value of $? - 1
#
set_provide_list()
{
    # Remember, plret is set to the early termination return code + 1,
    # or 0 if we want to continue the operation.
    #
    for i in $provide_list; do
	case $1$2 in
	start$RC_RUNNING|restart$RC_RUNNING)
	    varsym -s rcng_$i=running
	    ;;
	start$RC_FAILED|restart$RC_FAILED)
	    varsym -s rcng_$i=failed
	    ;;
	start$RC_DISABLED|restart$RC_DISABLED|reload$RC_DISABLED)
	    varsym -s rcng_$i=disabled
	    ;;
	start$RC_IRRELEVANT|restart$RC_IRRELEVANT|reload$RC_IRRELEVANT)
	    varsym -s rcng_$i=irrelevant
	    ;;
	start$RC_CONFIGURED|restart$RC_CONFIGURED)
	    varsym -s rcng_$i=configured
	    ;;
	stop$RC_DISABLED)
	    varsym -s rcng_$i=disabled
	    ;;
	stop$RC_IRRELEVANT)
	    varsym -s rcng_$i=irrelevant
	    ;;
	stop*)
	    varsym -s rcng_$i=stopped
	    ;;
	*)
	    ;;
	esac
    done
}

# check_early_term
#	$1	should be $rc_arg (start, stop, restart, reload, etc)
#	$2	return value $RC_*
#	$3	$rc_force	"" not to force, "anything" to force.
#
# The return code is 0 if early termination is not to occur, non-zero if
# it is to occur.  When early termination is to occur the caller should
# return check_early_term()'s return code - 1.    That is, early termination
# can occur with or without an error.
#
# The provide list will be adjusted when early termination occurs.
#
check_early_term()
{
    case $2 in
    $RC_RUNNING)
	return 0
	;;
    $RC_FAILED)
	set_provide_list $1 $2
	[ -z "$3" ] || return 0
	return 2
	;;
    $RC_DISABLED)
	set_provide_list $1 $2
	[ -z "$3" ] || return 0
	return 1
	;;
    $RC_IRRELEVANT)
	set_provide_list $1 $2
	[ -z "$3" ] || return 0
	return 1
	;;
    $RC_CONFIGURED)
	return 0
	;;
    $RC_STOPPED)
	return 0
	;;
    esac
    set_provide_list $1 $2
    [ -z "$3" ] || return 0
    return 2
}

# adjust_return_code $1
#
#	Convert the return code to an exit code of 0 (success) or 1 (failure)
#
adjust_return_code()
{
    if [ $1 = $RC_FAILED ]; then
	return 1
    fi
    return 0
}

#
# force_depend script
#	Force a service to start. Intended for use by services
#	to resolve dependency issues. It is assumed the caller
#	has check to make sure this call is necessary
#	$1 - filename of script, in /etc/rc.d, to run
#
force_depend()
{
	_depend="$1"

	info "${name} depends on ${_depend}, which will be forced to start."
	if ! /etc/rc.d/${_depend} forcestart ; then
		warn "Unable to force ${_depend}. It may already be running."
		return 1
	fi
	return 0
}

#
# checkyesno var
#	Test $1 variable, and warn if not set to YES or NO.
#	Return 0 if it's "yes" (et al), nonzero otherwise.
#
checkyesno()
{
	# try foo
	eval _value=\$${1%_enable}
	# try foo_enable
	if [ -z $_value ]
	then
		eval _value=\$${1%_enable}_enable;
	fi
	debug "checkyesno: $1 is set to $_value."
	case $_value in

		#	"yes", "true", "on", or "1"
	[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
		return 0
		;;

		#	"no", "false", "off", or "0"
	[Nn][Oo]|[Ff][Aa][Ll][Ss][Ee]|[Oo][Ff][Ff]|0)
		return 1
		;;
	*)
		warn "\$${1} is not set properly - see rc.conf(5)."
		return 1
		;;
	esac
}

# reverse_list list
#	print the list in reverse order
#
reverse_list()
{
	_revlist=
	for _revfile in $*; do
		_revlist="$_revfile $_revlist"
	done
	echo $_revlist
}

#
# mount_critical_filesystems type
#	Go through the list of critical filesystems as provided in
#	the rc.conf(5) variable $critical_filesystems_${type}, checking
#	each one to see if it is mounted, and if it is not, mounting it.
#
mount_critical_filesystems()
{
	eval _fslist=\$critical_filesystems_${1}
	for _fs in $_fslist; do
		mount | (
			_ismounted=no
			while read what _on on _type type; do
				if [ $on = $_fs ]; then
					_ismounted=yes
				fi
			done
			if [ $_ismounted = no ]; then
				mount $_fs >/dev/null 2>&1
			fi
		)
	done
}

#
# check_pidfile pidfile procname [interpreter]
#	Parses the first line of pidfile for a PID, and ensures
#	that the process is running and matches procname.
#	Prints the matching PID upon success, nothing otherwise.
#	interpreter is optional; see _find_processes() for details.
#
check_pidfile()
{
	_pidfile=$1
	_procname=$2
	_interpreter=$3
	if [ -z "$_pidfile" -o -z "$_procname" ]; then
		err 3 'USAGE: check_pidfile pidfile procname [interpreter]'
	fi
	if [ ! -f $_pidfile ]; then
		debug "pid file {$_pidfile): not readable."
		return
	fi
	read _pid _junk < $_pidfile
	if [ -z "$_pid" ]; then
		debug "pid file {$_pidfile): no pid in file."
		return
	fi
	_find_processes $_procname ${_interpreter:-.} '-p '"$_pid"
}

#
# check_process procname [interpreter]
#	Ensures that a process (or processes) named procname is running.
#	Prints a list of matching PIDs.
#	interpreter is optional; see _find_processes() for details.
#
check_process()
{
	_procname=$1
	_interpreter=$2
	if [ -z "$_procname" ]; then
		err 3 'USAGE: check_process procname [interpreter]'
	fi
	_find_processes $_procname ${_interpreter:-.} '-ax'
}

#
# _find_processes procname interpreter psargs
#	Search for procname in the output of ps generated by psargs.
#	Prints the PIDs of any matching processes, space separated.
#
#	If interpreter == ".", check the following variations of procname
#	against the first word of each command:
#		procname
#		`basename procname`
#		`basename procname` + ":"
#		"(" + `basename procname` + ")"
#
#	If interpreter != ".", read the first line of procname, remove the
#	leading #!, normalise whitespace, append procname, and attempt to
#	match that against each command, either as is, or with extra words
#	at the end.
#
_find_processes()
{
	if [ $# -ne 3 ]; then
		err 3 'USAGE: _find_processes procname interpreter psargs'
	fi
	_procname=$1
	_interpreter=$2
	_psargs=$3

	_pref=
	if [ $_interpreter != "." ]; then	# an interpreted script
		read _interp < $_procname	# read interpreter name
		_interp=${_interp#\#!}		# strip #!
		set -- $_interp
		if [ $_interpreter != $1 ]; then
			warn "\$command_interpreter $_interpreter != $1"
		fi
		_interp="$* $_procname"		# cleanup spaces, add _procname
		_interpbn="$1"			# the interpreter binary
		_fp_args='_argv'
		_fp_match='case "$_argv" in
		    "${_interpbn##*/}: "$_procname*|${_interp}|"${_interp} "*)'
	else					# a normal daemon
		_procnamebn=${_procname##*/}
		_fp_args='_arg0 _argv'
		_fp_match='case "$_arg0" in
		    $_procname|$_procnamebn|${_procnamebn}:|"(${_procnamebn})")'
	fi

	_proccheck='
		ps -o "pid,command" '"$_psargs"' |
		while read _npid '"$_fp_args"'; do
			case "$_npid" in
			    PID)
				continue ;;
			esac ; '"$_fp_match"'
				echo -n "$_pref$_npid" ;
				_pref=" "
				;;
			esac
		done'

#	debug "in _find_processes: proccheck is ($_proccheck)."
	eval $_proccheck
}

#
# wait_for_pids pid [pid ...]
#	spins until none of the pids exist
#
wait_for_pids()
{
	_list=$*
	if [ -z "$_list" ]; then
		return
	fi
	_prefix=
	while true; do
		_nlist="";
		for _j in $_list; do
			if kill -0 $_j 2>/dev/null; then
				_nlist="${_nlist}${_nlist:+ }$_j"
			fi
		done
		if [ -z "$_nlist" ]; then
			break
		fi
		_list=$_nlist
		echo -n ${_prefix:-"Waiting for PIDS: "}$_list
		_prefix=", "
		sleep 2
	done
	if [ -n "$_prefix" ]; then
		echo "."
	fi
}

#
# get_pidfile_from_conf string file
#
#	Takes a string to search for in the specified file.
#	Ignores lines with traditional comment characters.
#
# Example:
#
# if get_pidfile_from_conf string file; then
#	pidfile="$_pidfile_from_conf"
# else
#	pidfile='appropriate default'
# fi
#
get_pidfile_from_conf()
{
	if [ -z "$1" -o -z "$2" ]; then
		err 3 "USAGE: get_pidfile_from_conf string file ($name)"
	fi

	local string file line

	string="$1" ; file="$2"

	if [ ! -s "$file" ]; then
		err 3 "get_pidfile_from_conf: $file does not exist ($name)"
	fi

	while read line; do
		case "$line" in
		*[#\;]*${string}*)	continue ;;
		*${string}*)		break ;;
		esac
	done < $file

	if [ -n "$line" ]; then
		line=${line#*/}
		_pidfile_from_conf="/${line%%[\"\;]*}"
	else
		return 1
	fi
}

#
# check_startmsgs
#	If rc_quiet is set (usually as a result of using faststart at
#	boot time) check if rc_startmsgs is enabled.
#
check_startmsgs()
{
	if [ -n "$rc_quiet" ]; then
		checkyesno rc_startmsgs
	else
		return 0
	fi
}

#
# run_rc_command argument
#	Search for argument in the list of supported commands, which is:
#		"start stop restart rcvar status poll ${extra_commands}"
#	If there's a match, run ${argument}_cmd or the default method
#	(see below).
#
#	If argument has a given prefix, then change the operation as follows:
#		Prefix	Operation
#		------	---------
#		fast	Skip the pid check, and set rc_fast=yes, rc_quiet=yes
#		force	Set ${rcvar} to YES, and set rc_force=yes
#		one	Set ${rcvar} to YES
#		quiet	Don't output some diagnostics, and set rc_quiet=yes
#
#	The following globals are used:
#
#	Name		Needed	Purpose
#	----		------	-------
#	provide_list	(gen)	list of keywords provided by current rcng file
#
#	name		y	Name of script.
#
#	command		n	Full path to command.
#				Not needed if ${rc_arg}_cmd is set for
#				each keyword.
#
#	command_args	n	Optional args/shell directives for command.
#
#	command_interpreter n	If not empty, command is interpreted, so
#				call check_{pidfile,process}() appropriately.
#
#	extra_commands	n	List of extra commands supported.
#
#	pidfile		n	If set, use check_pidfile $pidfile $command,
#				otherwise use check_process $command.
#				In either case, only check if $command is set.
#
#	procname	n	Process name to check for instead of $command.
#
#	rcvar		n	This is checked with checkyesno to determine
#				if the action should be run.
#
#	${name}_chroot	n	Directory to chroot to before running ${command}
#				Requires /usr to be mounted.
#
#	${name}_chdir	n	Directory to cd to before running ${command}
#				(if not using ${name}_chroot).
#
#	${name}_flags	n	Arguments to call ${command} with.
#				NOTE:	$flags from the parent environment
#					can be used to override this.
#
#	${name}_env	n	Environment variables to run ${command} with.
#
#	${name}_nice	n	Nice level to run ${command} at.
#
#	${name}_user	n	User to run ${command} as, using su(1) if not
#				using ${name}_chroot.
#				Requires /usr to be mounted.
#
#	${name}_group	n	Group to run chrooted ${command} as.
#				Requires /usr to be mounted.
#
#	${name}_groups	n	Comma separated list of supplementary groups
#				to run the chrooted ${command} with.
#				Requires /usr to be mounted.
#
#	${name}_prepend	n	Command added before ${command}.
#
#	${rc_arg}_cmd	n	If set, use this as the method when invoked;
#				Otherwise, use default command (see below)
#
#	${rc_arg}_precmd n	If set, run just before performing the
#				${rc_arg}_cmd method in the default
#				operation (i.e, after checking for required
#				bits and process (non)existence).
#				If this completes with a non-zero exit code,
#				don't run ${rc_arg}_cmd.
#
#	${rc_arg}_postcmd n	If set, run just after performing the
#				${rc_arg}_cmd method, if that method
#				returned a zero exit code.
#
#	required_dirs	n	If set, check for the existence of the given
#				directories before running the default
#				(re)start command.
#
#	required_files	n	If set, check for the readability of the given
#				files before running the default (re)start
#				command.
#
#	required_modules n	If set, ensure the given kernel modules are
#				loaded before running a (re)start command.
#				The check and possible loads are actually
#				done after start_precmd so that the modules
#				aren't loaded in vain, should the precmd
#				return a non-zero status to indicate a error.
#				If a word in the list looks like "foo:bar",
#				"foo" is the KLD file name and "bar" is the
#				module name.  If a word looks like "foo~bar",
#				"foo" is the KLD file name and "bar" is a
#				egrep(1) pattern matching the module name.
#				Otherwise the module name is assumed to be
#				the same as the KLD file name, which is most
#				common.  See load_kld().
#
#	required_vars	n	If set, perform checkyesno on each of the
#				listed variables before running the default
#				(re)start command.
#
#	Default behaviour for a given argument, if no override method is
#	provided:
#
#	Argument	Default behaviour
#	--------	-----------------
#	start		if !running && checkyesno ${rcvar}
#				${command}
#
#	stop		if ${pidfile}
#				rc_pid=$(check_pidfile $pidfile $command)
#			else
#				rc_pid=$(check_process $command)
#			kill $sig_stop $rc_pid
#			wait_for_pids $rc_pid
#			($sig_stop defaults to TERM.)
#
#	reload		Similar to stop, except use $sig_reload instead,
#			and doesn't wait_for_pids.
#			$sig_reload defaults to HUP.
#
#	restart		Run `stop' then `start'.
#
#	status		Show if ${command} is running, etc.
#
#	poll		Wait for ${command} to exit.
#
#	rcvar		Display what rc.conf variable is used (if any).
#
#	Variables available to methods, and after run_rc_command() has
#	completed:
#
#	Variable	Purpose
#	--------	-------
#	rc_arg		Argument to command, after fast/force/one processing
#			performed
#
#	rc_flags	Flags to start the default command with.
#			Defaults to ${name}_flags, unless overridden
#			by $flags from the environment.
#			This variable may be changed by the precmd method.
#
#	rc_pid		PID of command (if appropriate)
#
#	rc_fast		Not empty if "fast" was provided (q.v.)
#
#	rc_force	Not empty if "force" was provided (q.v.)
#
#	rc_quiet	Not empty if "quiet" was provided
#
#
dummy_rc_command()
{
	rc_arg=$1

	case "$rc_arg" in
	fast*)				# "fast" prefix; don't check pid
		rc_arg=${rc_arg#fast}
		;;
	force*)				# "force" prefix; always start
		rc_arg=${rc_arg#force}
		;;
	one*)				# "one" prefix; set ${rcvar}=yes
		rc_arg=${rc_arg#one}
		;;
	esac
	set_provide_list $rc_arg $RC_CONFIGURED
	return 0
}

run_rc_command()
{
	_return=0
	rc_arg=$1
	if [ -z "$name" ]; then
		err 3 'run_rc_command: $name is not set.'
	fi

	# Don't repeat the first argument when passing additional command-
	# line arguments to the command subroutines.
	#
	shift 1
	rc_extra_args="$*"

	case "$rc_arg" in
	fast*)				# "fast" prefix; don't check pid
		rc_arg=${rc_arg#fast}
		rc_fast=yes
		rc_quiet=yes
		;;
	force*)				# "force" prefix; always start
		rc_arg=${rc_arg#force}
		rc_force=yes
		if [ -n "${rcvar}" ]; then
			eval ${rcvar}=YES
		fi
		;;
	one*)				# "one" prefix; set ${rcvar}=yes
		rc_arg=${rc_arg#one}
		if [ -n "${rcvar}" ]; then
			eval ${rcvar}=YES
		fi
		;;
	quiet*)				# "quiet" prefix; omit some messages
		_rc_prefix=quiet
		rc_arg=${rc_arg#${_rc_prefix}}
		rc_quiet=yes
		;;
	esac

	eval _override_command=\$${name}_program
	if [ -n "$_override_command" ]; then
		command=$_override_command
	fi

	_keywords="start stop restart rcvar $extra_commands"
	rc_pid=
	_pidcmd=
	_procname=${procname:-${command}}

					# setup pid check command if not fast
	if [ -z "$rc_fast" -a -n "$_procname" ]; then
		if [ -n "$pidfile" ]; then
			_pidcmd='rc_pid=$(check_pidfile '"$pidfile $_procname $command_interpreter"')'
		else
			_pidcmd='rc_pid=$(check_process '"$_procname $command_interpreter"')'
		fi
		if [ -n "$_pidcmd" ]; then
			_keywords="${_keywords} status poll"
		fi
	fi

	if [ -z "$rc_arg" ]; then
		rc_usage "$_keywords"
	fi

	if [ -n "$flags" ]; then	# allow override from environment
		rc_flags=$flags
	else
		eval rc_flags=\$${name}_flags
	fi
	eval _chdir=\$${name}_chdir	_chroot=\$${name}_chroot \
	    _nice=\$${name}_nice	_user=\$${name}_user \
	    _group=\$${name}_group	_groups=\$${name}_groups \
	    _env=\$${name}_env 		_prepend=\$${name}_prepend

	if [ -n "$_user" ]; then	# unset $_user if running as that user
		if [ "$_user" = "$(id -un)" ]; then
			unset _user
		fi
	fi

					# if ${rcvar} is set, and $1 is not
					# "rcvar", then run
					#	checkyesno ${rcvar}
					# and return if that failed
					#
	if [ -n "${rcvar}" -a "$rc_arg" != "rcvar" ]; then
		if ! checkyesno ${rcvar}; then
			set_provide_list $rc_arg $RC_DISABLED
			return 0
		fi
	fi

	eval $_pidcmd			# determine the pid if necessary

	for _elem in $_keywords; do
		if [ "$_elem" != "$rc_arg" ]; then
			continue
		fi

					# if there's a custom ${XXX_cmd},
					# run that instead of the default
					#
		eval _cmd=\$${rc_arg}_cmd _precmd=\$${rc_arg}_precmd \
		    _postcmd=\$${rc_arg}_postcmd
		if [ -n "$_cmd" ]; then
					# if the precmd failed and force
					# isn't set, exit
					#
			if [ -n "$_precmd" ]; then
				debug "run_rc_command: evaluating ${_precmd}()."
				eval $_precmd $rc_extra_args

				_return=$?
				check_early_term $rc_arg $_return "$rc_force" || return $(($?-1))
			fi

			if [ -n "$_cmd" ]; then
				debug "run_rc_command: evaluating ${_cmd}()."
				eval $_cmd $rc_extra_args
				_return=$?
				check_early_term $rc_arg $_return "$rc_force" || return $(($?-1))
			fi

			if [ -n "$_postcmd" ]; then
				debug "run_rc_command: evaluating ${_postcmd}()."
				eval $_postcmd $rc_extra_args
				_return=$?
				check_early_term $rc_arg $_return "" || return $(($?-1))
			fi
			set_provide_list $rc_arg $_return
			adjust_return_code $_return
			return $?
		fi

		case "$rc_arg" in	# default operations...

		status)
			if [ -n "$rc_pid" ]; then
				echo "${name} is running as pid $rc_pid."
			else
				echo "${name} is not running."
				return 1
			fi
			;;

		start)
			if [ -n "$rc_pid" ]; then
				if [ -z "$rc_quiet" ]; then
					echo "${name} already running? (pid=$rc_pid)."
				fi
				exit 1
			fi

			if [ ! -x $command ]; then
				info "run_rc_command: cannot run ($command)."
				set_provide_list $rc_arg $RC_FAILED
				adjust_return_code $RC_FAILED
				return $?
			fi

					# check for required variables,
					# directories, and files
					#
			for _f in $required_vars; do
				if ! checkyesno $_f; then
					warn "\$${_f} is not set."
					if [ -z "$rc_force" ]; then
						set_provide_list $rc_arg $RC_FAILED
						adjust_return_code $RC_FAILED
						return $?
					fi
				fi
			done
			for _f in $required_dirs; do
				if [ ! -d "${_f}/." ]; then
					warn "${_f} is not a directory."
					if [ -z "$rc_force" ]; then
						set_provide_list $rc_arg $RC_FAILED
						adjust_return_code $RC_FAILED
						return $?
					fi
				fi
			done
			for _f in $required_files; do
				if [ ! -r "${_f}" ]; then
					warn "${_f} is not readable."
					if [ -z "$rc_force" ]; then
						set_provide_list $rc_arg $RC_FAILED
						adjust_return_code $RC_FAILED
						return $?
					fi
				fi
			done
			for _f in $required_modules; do
				case "${_f}" in
				*~*)	_args="-e ${_f#*~} ${_f%%~*}" ;;
				*:*)	_args="-m ${_f#*:} ${_f%%:*}" ;;
				*)	_args="${_f}" ;;
				esac
				if ! load_kld ${_args}; then
					if [ -z "$rc_force" ]; then
						set_provide_list $rc_arg $RC_FAILED
						adjust_return_code $RC_FAILED
						return $?
					fi
				fi
			done

					# if the precmd failed and force
					# isn't set, exit
					#
			if [ -n "${_precmd}" ]; then
				debug "run_rc_command: evaluating ${_precmd}()."
				eval $_precmd
				_return=$?
				check_early_term $rc_arg $_return "$rc_force" || return $(($?-1))
			fi

					# setup the command to run, and run it
					#
			echo "Starting ${name}."
			if [ -n "$_chroot" ]; then
				_doit="\
${_nice:+nice -n $_nice }\
${_env:+env $_env }\
chroot ${_user:+-u $_user }${_group:+-g $_group }${_groups:+-G $_groups }\
$_chroot $command $rc_flags $command_args"
			else
				_doit="\
${_chdir:+cd $_chdir; }\
${_nice:+nice -n $_nice }\
${_env:+env $_env }\
$command $rc_flags $command_args"
				if [ -n "$_user" ]; then
				    _doit="su -m $_user -c 'sh -c \"$_doit\"'"
				fi
				if [ -n "$_prepend" ]; then
					_doit="$_prepend $_doit"
				fi
			fi

					# if the cmd failed and force
					# isn't set, exit
					#
			debug "run_rc_command: _doit: $_doit"
			eval $_doit
			_return=$?
			check_early_term $rc_arg $_return "$rc_force" || return $(($?-1))
					# finally, run postcmd
					#
			if [ -n "${_postcmd}" ]; then
				debug "run_rc_command: evaluating ${_postcmd}()."
				eval $_postcmd
			fi
			;;

		stop)
			if [ -z "$rc_pid" ]; then
				if [ -n "$pidfile" ]; then
					echo \
				    "${name} not running? (check $pidfile)."
				else
					echo "${name} not running?"
				fi
				set_provide_list $rc_arg $RC_STOPPED
				exit 1
			fi

					# if the precmd failed and force
					# isn't set, exit
					#
			if [ -n "$_precmd" ]; then
				eval $_precmd
				_return=$?
				check_early_term $rc_arg $_return "$rc_force" || return $(($?-1))
			fi

					# send the signal to stop
					#
			echo "Stopping ${name}."
			_doit="kill -${sig_stop:-TERM} $rc_pid"
			if [ -n "$_user" ]; then
				_doit="su -m $_user -c 'sh -c \"$_doit\"'"
			fi

					# if the stop cmd failed and force
					# isn't set, exit
					#
			eval $_doit
			_return=$?
			check_early_term $rc_arg $_return "$rc_force" || return $(($?-1))
					# wait for the command to exit,
					# and run postcmd.
			sleep 0.1
			wait_for_pids $rc_pid
			if [ -n "$_postcmd" ]; then
				eval $_postcmd
				_return=$?
			fi
			;;

		reload)
			if [ -z "$rc_pid" ]; then
				if [ -n "$pidfile" ]; then
					echo \
				    "${name} not running? (check $pidfile)."
				else
					echo "${name} not running?"
				fi
				set_provide_list $rc_arg $RC_FAILED
				exit 1
			fi
			echo "Reloading ${name} config files."
			if [ -n "$_precmd" ]; then
				eval $_precmd
				_return=$?
				check_early_term $rc_arg $_return "$rc_force" || return $(($?-1))
			fi
			_doit="kill -${sig_reload:-HUP} $rc_pid"
			if [ -n "$_user" ]; then
				_doit="su -m $_user -c 'sh -c \"$_doit\"'"
			fi
			eval $_doit
			_return=$?
			check_early_term $rc_arg $_return "$rc_force" || return $(($?-1))
			if [ -n "$_postcmd" ]; then
				eval $_postcmd
				_return=$?
			fi
			;;

		restart)
			if [ -n "$_precmd" ]; then
				eval $_precmd $rc_extra_args
				_return=$?
				check_early_term $rc_arg $_return "$rc_force" || return $(($?-1))
			fi
					# prevent restart being called more
					# than once by any given script
					#
			if [ -n "$_rc_restart_done" ]; then
				return 0
			fi
			_rc_restart_done=YES

			( $0 ${rc_force:+force}stop $rc_extra_args )
			$0 ${rc_force:+force}start $rc_extra_args
			_return=$?

			if [ -n "$_postcmd" ]; then
				eval $_postcmd $rc_extra_args
				adjust_return_code $?
				_return=$?
			fi
			# Do not set_provide_list(), the start command above
			# will have done it for us and we do not know the
			# actual RC code to base a setting on here.
			#
			return $_return
			;;

		poll)
			if [ -n "$rc_pid" ]; then
				wait_for_pids $rc_pid
			fi
			;;

		rcvar)
			echo "# $name"
			if [ -n "$rcvar" ]; then
				if checkyesno ${rcvar}; then
					echo "\$${rcvar}=YES"
				else
					echo "\$${rcvar}=NO"
				fi
			fi
			;;

		*)
			rc_usage "$_keywords"
			;;

		esac
		set_provide_list $rc_arg $_return
		adjust_return_code $_return
		return $?
	done

	echo 1>&2 "$0: unknown directive '$rc_arg'."
	rc_usage "$_keywords"
	exit 1
}

#
# Helper functions for run_rc_command: common code.
# They use such global variables besides the exported rc_* ones:
#
#	name	       R/W
#	------------------
#	_precmd		R
#	_postcmd	R
#	_return		W
#
_run_rc_precmd()
{
	check_required_before "$rc_arg" || return 1

	if [ -n "$_precmd" ]; then
		debug "run_rc_command: ${rc_arg}_precmd: $_precmd $rc_extra_args"
		eval "$_precmd $rc_extra_args"
		_return=$?

		# If precmd failed and force isn't set, request exit.
		if [ $_return -ne 0 ] && [ -z "$rc_force" ]; then
			return 1
		fi
	fi

	check_required_after "$rc_arg" || return 1

	return 0
}

_run_rc_postcmd()
{
	if [ -n "$_postcmd" ]; then
		debug "run_rc_command: ${rc_arg}_postcmd: $_postcmd $rc_extra_args"
		eval "$_postcmd $rc_extra_args"
		_return=$?
	fi
	return 0
}

_run_rc_doit()
{
	debug "run_rc_command: doit: $*"
	eval "$@"
	_return=$?

	# If command failed and force isn't set, request exit.
	if [ $_return -ne 0 ] && [ -z "$rc_force" ]; then
		return 1
	fi

	return 0
}

_run_rc_notrunning()
{
	local _pidmsg

	if [ -n "$pidfile" ]; then
		_pidmsg=" (check $pidfile)."
	else
		_pidmsg=
	fi
	echo 1>&2 "${name} not running?${_pidmsg}"
}

_run_rc_killcmd()
{
	local _cmd

	_cmd="kill -$1 $rc_pid"
	if [ -n "$_user" ]; then
		_cmd="su -m ${_user} -c 'sh -c \"${_cmd}\"'"
	fi
	echo "$_cmd"
}

#
# run_rc_script file arg
#	Start the script `file' with `arg', and correctly handle the
#	return value from the script.  If `file' ends with `.sh', it's
#	sourced into the current environment.  If `file' appears to be
#	a backup or scratch file, ignore it.  Otherwise if it's
#	executable run as a child process.
#
run_rc_script()
{
	_file=$1
	_arg=$2
	if [ -z "$_file" -o -z "$_arg" ]; then
		err 3 'USAGE: run_rc_script file arg'
	fi

	trap "echo 'Reboot interrupted'; exit 1" 3

	unset	name command command_args command_interpreter \
		extra_commands pidfile procname \
		rcvar required_dirs required_files required_vars
	eval unset ${_arg}_cmd ${_arg}_precmd ${_arg}_postcmd

	case "$_file" in
	*.sh)				# run in current shell
		set $_arg ; . $_file
		;;
	*[~#]|*.OLD|*.orig)		# scratch file; skip
		warn "Ignoring scratch file $_file"
		;;
	*)				# run in subshell
		if [ -x $_file ]; then
			if [ -n "$rc_fast_and_loose" ]; then
				set $_arg ; . $_file
			else
				( trap "echo 'Reboot interrupted'; exit 1" 3
				  set $_arg ; . $_file )
			fi
		fi
		;;
	esac
}

# Code common to scripts that need to load a kernel module
# if it isn't in the kernel yet. Syntax:
#   load_kld [-e regex] [-m module] file
# where -e or -m chooses the way to check if the module
# is already loaded:
#   regex is egrep'd in the output from `kldstat -v',
#   module is passed to `kldstat -m'.
# The default way is as though `-m file' were specified.
load_kld()
{
	local _loaded _mod _opt _re

	while getopts "e:m:" _opt; do
		case "$_opt" in
		e) _re="$OPTARG" ;;
		m) _mod="$OPTARG" ;;
		*) err 3 'USAGE: load_kld [-e regex] [-m module] file' ;;
		esac
	done
	shift $(($OPTIND - 1))
	if [ $# -ne 1 ]; then
		err 3 'USAGE: load_kld [-e regex] [-m module] file'
	fi
	_mod=${_mod:-$1}
	_loaded=false
	if [ -n "$_re" ]; then
		if kldstat -v | egrep -q -e "$_re"; then
			_loaded=true
		fi
	else
		if kldstat -q -m "$_mod"; then
			_loaded=true
		fi
	fi
	if ! $_loaded; then
		if ! kldload "$1"; then
			warn "Unable to load kernel module $1"
			return 1
		else
			info "$1 kernel module loaded."
		fi
	else
		debug "load_kld: $1 kernel module already loaded."
	fi
	return 0
}


# ltr str src dst
#	Change every $src in $str to $dst.
#	Useful when /usr is not yet mounted and we cannot use tr(1), sed(1) nor
#	awk(1).
ltr()
{
	local _str _src _dst _out _com
	_str=$1
	_src=$2
	_dst=$3
	_out=""

	IFS=${_src}
	for _com in ${_str}; do
		if [ -z "${_out}" ]; then
			_out="${_com}"
		else
			_out="${_out}${_dst}${_com}"
		fi
	done
	echo "${_out}"
}

#
# load_rc_config
#	Source in the configuration file for a given command.
#
load_rc_config()
{
	_command=$1
	if [ -z "$_command" ]; then
		err 3 'USAGE: load_rc_config command'
	fi

	if [ -z "$_rc_conf_loaded" ]; then
		if [ -r /etc/defaults/rc.conf ]; then
			debug "Sourcing /etc/defaults/rc.conf"
			. /etc/defaults/rc.conf
			source_rc_confs
		elif [ -r /etc/rc.conf ]; then
			debug "Sourcing /etc/rc.conf (/etc/defaults/rc.conf doesn't exist)."
			. /etc/rc.conf
		fi
		_rc_conf_loaded=YES
	fi
	if [ -f /etc/rc.conf.d/"$_command" ]; then
		debug "Sourcing /etc/rc.conf.d/${_command}"
		. /etc/rc.conf.d/"$_command"
	fi

	# XXX - Deprecated variable name support
	#
	[ -n "$portmap_enable" ] && rpcbind_enable="$portmap_enable"
	[ -n "$portmap_program" ] && rpcbind_program="$portmap_program"
	[ -n "$portmap_flags" ] && rpcbind_flags="$portmap_flags"
	[ -n "$single_mountd_enable" ] && mountd_enable="$single_mountd_enable"

}

#
# rc_usage commands
#	Print a usage string for $0, with `commands' being a list of
#	valid commands.
#
rc_usage()
{
	echo -n 1>&2 "Usage: $0 [fast|force|one|quiet]("

	_sep=
	for _elem in $*; do
		echo -n 1>&2 "$_sep$_elem"
		_sep="|"
	done
	echo 1>&2 ")"
	exit 1
}

#
# err exitval message
#	Display message to stderr and log to the syslog, and exit with exitval.
#
err()
{
	exitval=$1
	shift

	if [ -x /usr/bin/logger ]; then
		logger "$0: ERROR: $*"
	fi
	echo 1>&2 "$0: ERROR: $*"
	exit $exitval
}

#
# warn message
#	Display message to stderr and log to the syslog.
#
warn()
{
	if [ -x /usr/bin/logger ]; then
		logger "$0: WARNING: $*"
	fi
	echo 1>&2 "$0: WARNING: $*"
}

#
# info message
#	Display informational message to stdout and log to syslog.
#
info()
{
	case ${rc_info} in
	[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
		if [ -x /usr/bin/logger ]; then
			logger "$0: INFO: $*"
		fi
		echo "$0: INFO: $*"
		;;
	esac
}

#
# debug message
#	If debugging is enabled in rc.conf output message to stderr.
#	BEWARE that you don't call any subroutine that itself calls this
#	function.
#
debug()
{
	case ${rc_debug} in
	[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
		if [ -x /usr/bin/logger ]; then
			logger "$0: INFO: $*"
		fi
        	echo 1>&2 "$0: DEBUG: $*"
		;;
	esac
}

#
# backup_file action file cur backup
#	Make a backup copy of `file' into `cur', and save the previous
#	version of `cur' as `backup' or use rcs for archiving.
#
#	This routine checks the value of the backup_uses_rcs variable,
#	which can be either YES or NO.
#
#	The `action' keyword can be one of the following:
#
#	add		`file' is now being backed up (and is possibly
#			being reentered into the backups system).  `cur'
#			is created and RCS files, if necessary, are
#			created as well.
#
#	update		`file' has changed and needs to be backed up.
#			If `cur' exists, it is copied to to `back' or
#			checked into RCS (if the repository file is old),
#			and then `file' is copied to `cur'.  Another RCS
#			check in done here if RCS is being used.
#
#	remove		`file' is no longer being tracked by the backups
#			system.  If RCS is not being used, `cur' is moved
#			to `back', otherwise an empty file is checked in,
#			and then `cur' is removed.
#
#
backup_file()
{
	_action=$1
	_cpfile=$2
	_cur=$3
	_back=$4

	if checkyesno backup_uses_rcs; then
		_msg0="backup archive"
		_msg1="update"

		# ensure that history file is not locked
		if [ -f $_cur,v ]; then
			rcs -q -u -U -M $_cur
		fi

		# ensure after switching to rcs that the
		# current backup is not lost
		if [ -f $_cur ]; then
			# no archive, or current newer than archive
			if [ ! -f $_cur,v -o $_cur -nt $_cur,v ]; then
				ci -q -f -u -t-"$_msg0" -m"$_msg1" $_cur
				rcs -q -kb -U $_cur
				co -q -f -u $_cur
			fi
		fi

		case $_action in
		add|update)
			cp -p $_cpfile $_cur
			ci -q -f -u -t-"$_msg0" -m"$_msg1" $_cur
			rcs -q -kb -U $_cur
			co -q -f -u $_cur
			chown root:wheel $_cur $_cur,v
			;;
		remove)
			cp /dev/null $_cur
			ci -q -f -u -t-"$_msg0" -m"$_msg1" $_cur
			rcs -q -kb -U $_cur
			chown root:wheel $_cur $_cur,v
			rm $_cur
			;;
		esac
	else
		case $_action in
		add|update)
			if [ -f $_cur ]; then
				cp -p $_cur $_back
			fi
			cp -p $_cpfile $_cur
			chown root:wheel $_cur
			;;
		remove)
			mv -f $_cur $_back
			;;
		esac
	fi
}

# devfs_mount_jail dir
# Mounts a devfs file system appropriate for jails
# on the directory dir.
# This function returns non-zero if an error occurs.
#
devfs_mount_jail()
{
	local jdev _me
	jdev="$1"
	_me="devfs_mount_jail"

	if ! devfs_domount "$jdev" $rs; then
		warn "$_me: devfs was not mounted on $jdev"
		return 1
	fi
	return 0
}

# devfs_domount dir
# Mount devfs on dir.
# Returns 0 on success.
#
devfs_domount()
{
	local devdir _me
	devdir="$1"
	_me="devfs_domount()"

	if [ -z "$devdir" ]; then
		warn "$_me: you must specify a mount-point"
		return 1
	fi

	debug "$_me: mount-point is ($devdir)"
	if ! mount -t devfs devfs "$devdir"; then
		warn "$_me: Unable to mount devfs on $devdir"
		return 1
	fi

return 0
}

# Find scripts in local_startup directories.
find_local_scripts() {
	local_rc=''
	for dir in ${local_startup}; do
		if [ -d "${dir}" ]; then
			for file in `grep -l '^# PROVIDE:' ${dir}/* 2>/dev/null`; do
				case "$file" in
				*.sample) ;;
				*)	if [ -x "$file" ]; then
						local_rc="${local_rc} ${file}"
					fi
					;;
				esac
			done
		fi
	done
}