D.2.
/lib/lsb/init-functions
#!/bin/sh
########################################################################
#
# Begin /lib/lsb/init-funtions
#
# Description : Run Level Control Functions
#
# Authors : Gerard Beekmans - [email protected]
# : DJ Lucas - [email protected]
# Update : Bruce Dubbs - [email protected]
#
# Version : LFS 7.0
#
# Notes : With code based on Matthias Benkmann's simpleinit-msb
# http://winterdrache.de/linux/newboot/index.html
#
# The file should be located in /lib/lsb
#
########################################################################
## Environmental setup
# Setup default values for environment
umask 022
export PATH="/bin:/usr/bin:/sbin:/usr/sbin"
## Screen Dimensions
# Find current screen size
if [ -z "${COLUMNS}" ]; then
COLUMNS=$(stty size)
COLUMNS=${COLUMNS##* }
fi
# When using remote connections, such as a serial port, stty size returns 0
if [ "${COLUMNS}" = "0" ]; then
COLUMNS=80
fi
## Measurements for positioning result messages
COL=$((${COLUMNS} - 8))
WCOL=$((${COL} - 2))
## Set Cursor Position Commands, used via echo
SET_COL="\\033[${COL}G" # at the $COL char
SET_WCOL="\\033[${WCOL}G" # at the $WCOL char
CURS_UP="\\033[1A\\033[0G" # Up one line, at the 0'th char
## Set color commands, used via echo
# Please consult `man console_codes for more information
# under the "ECMA-48 Set Graphics Rendition" section
#
# Warning: when switching from a 8bit to a 9bit font,
# the linux console will reinterpret the bold (1;) to
# the top 256 glyphs of the 9bit font. This does
# not affect framebuffer consoles
NORMAL="\\033[0;39m" # Standard console grey
SUCCESS="\\033[1;32m" # Success is green
WARNING="\\033[1;33m" # Warnings are yellow
FAILURE="\\033[1;31m" # Failures are red
INFO="\\033[1;36m" # Information is light cyan
BRACKET="\\033[1;34m" # Brackets are blue
BOOTLOG=/run/var/bootlog
KILLDELAY=3
# Set any user specified environment variables e.g. HEADLESS
[ -r /etc/sysconfig/rc.site ] && . /etc/sysconfig/rc.site
################################################################################
# start_daemon() #
# Usage: start_daemon [-f] [-n nicelevel] [-p pidfile] pathname [args...] #
# #
# Purpose: This runs the specified program as a daemon #
# #
# Inputs: -f: (force) run the program even if it is already running. #
# -n nicelevel: specify a nice level. See 'man nice(1)'. #
# -p pidfile: use the specified file to determine PIDs. #
# pathname: the complete path to the specified program #
# args: additional arguments passed to the program (pathname) #
# #
# Return values (as defined by LSB exit codes): #
# 0 - program is running or service is OK #
# 1 - generic or unspecified error #
# 2 - invalid or excessive argument(s) #
# 5 - program is not installed #
################################################################################
start_daemon()
{
local force=""
local nice="0"
local pidfile=""
local pidlist=""
local retval=""
# Process arguments
while true
do
case "${1}" in
-f)
force="1"
shift 1
;;
-n)
nice="${2}"
shift 2
;;
-p)
pidfile="${2}"
shift 2
;;
-*)
return 2
;;
*)
program="${1}"
break
;;
esac
done
# Check for a valid program
if [ ! -e "${program}" ]; then return 5; fi
# Execute
if [ -z "${force}" ]; then
if [ -z "${pidfile}" ]; then
# Determine the pid by discovery
pidlist=`pidofproc "${1}"`
retval="${?}"
else
# The PID file contains the needed PIDs
# Note that by LSB requirement, the path must be given to pidofproc,
# however, it is not used by the current implementation or standard.
pidlist=`pidofproc -p "${pidfile}" "${1}"`
retval="${?}"
fi
# Return a value ONLY
# It is the init script's (or distribution's functions) responsibilty
# to log messages!
case "${retval}" in
0)
# Program is already running correctly, this is a
# succesful start.
return 0
;;
1)
# Program is not running, but an invalid pid file exists
# remove the pid file and continue
rm -f "${pidfile}"
;;
3)
# Program is not running and no pidfile exists
# do nothing here, let start_deamon continue.
;;
*)
# Others as returned by status values shall not be interpreted
# and returned as an unspecified error.
return 1
;;
esac
fi
# Do the start!
nice -n "${nice}" "${@}"
}
################################################################################
# killproc() #
# Usage: killproc [-p pidfile] pathname [signal] #
# #
# Purpose: Send control signals to running processes #
# #
# Inputs: -p pidfile, uses the specified pidfile #
# pathname, pathname to the specified program #
# signal, send this signal to pathname #
# #
# Return values (as defined by LSB exit codes): #
# 0 - program (pathname) has stopped/is already stopped or a #
# running program has been sent specified signal and stopped #
# successfully #
# 1 - generic or unspecified error #
# 2 - invalid or excessive argument(s) #
# 5 - program is not installed #
# 7 - program is not running and a signal was supplied #
################################################################################
killproc()
{
local pidfile
local program
local prefix
local progname
local signal="-TERM"
local fallback="-KILL"
local nosig
local pidlist
local retval
local pid
local delay="30"
local piddead
local dtime
# Process arguments
while true; do
case "${1}" in
-p)
pidfile="${2}"
shift 2
;;
*)
program="${1}"
if [ -n "${2}" ]; then
signal="${2}"
fallback=""
else
nosig=1
fi
# Error on additional arguments
if [ -n "${3}" ]; then
return 2
else
break
fi
;;
esac
done
# Check for a valid program
if [ ! -e "${program}" ]; then return 5; fi
# Check for a valid signal
check_signal "${signal}"
if [ "${?}" -ne "0" ]; then return 2; fi
# Get a list of pids
if [ -z "${pidfile}" ]; then
# determine the pid by discovery
pidlist=`pidofproc "${1}"`
retval="${?}"
else
# The PID file contains the needed PIDs
# Note that by LSB requirement, the path must be given to pidofproc,
# however, it is not used by the current implementation or standard.
pidlist=`pidofproc -p "${pidfile}" "${1}"`
retval="${?}"
fi
# Return a value ONLY
# It is the init script's (or distribution's functions) responsibilty
# to log messages!
case "${retval}" in
0)
# Program is running correctly
# Do nothing here, let killproc continue.
;;
1)
# Program is not running, but an invalid pid file exists
# Remove the pid file.
rm -f "${pidfile}"
# This is only a success if no signal was passed.
if [ -n "${nosig}" ]; then
return 0
else
return 7
fi
;;
3)
# Program is not running and no pidfile exists
# This is only a success if no signal was passed.
if [ -n "${nosig}" ]; then
return 0
else
return 7
fi
;;
*)
# Others as returned by status values shall not be interpreted
# and returned as an unspecified error.
return 1
;;
esac
# Perform different actions for exit signals and control signals
check_sig_type "${signal}"
if [ "${?}" -eq "0" ]; then # Signal is used to terminate the program
# Account for empty pidlist (pid file still exists and no
# signal was given)
if [ "${pidlist}" != "" ]; then
# Kill the list of pids
for pid in ${pidlist}; do
kill -0 "${pid}" 2> /dev/null
if [ "${?}" -ne "0" ]; then
# Process is dead, continue to next and assume all is well
continue
else
kill "${signal}" "${pid}" 2> /dev/null
# Wait up to ${delay}/10 seconds to for "${pid}" to
# terminate in 10ths of a second
while [ "${delay}" -ne "0" ]; do
kill -0 "${pid}" 2> /dev/null || piddead="1"
if [ "${piddead}" = "1" ]; then break; fi
sleep 0.1
delay="$(( ${delay} - 1 ))"
done
# If a fallback is set, and program is still running, then
# use the fallback
if [ -n "${fallback}" -a "${piddead}" != "1" ]; then
kill "${fallback}" "${pid}" 2> /dev/null
sleep 1
# Check again, and fail if still running
kill -0 "${pid}" 2> /dev/null && return 1
else
# just check one last time and if still alive, fail
sleep 1
kill -0 "${pid}" 2> /dev/null && return 1
fi
fi
done
fi
# Check for and remove stale PID files.
if [ -z "${pidfile}" ]; then
# Find the basename of $program
prefix=`echo "${program}" | sed 's/[^/]*$//'`
progname=`echo "${program}" | sed "s@${prefix}@@"`
if [ -e "/var/run/${progname}.pid" ]; then
rm -f "/var/run/${progname}.pid" 2> /dev/null
fi
else
if [ -e "${pidfile}" ]; then rm -f "${pidfile}" 2> /dev/null; fi
fi
# For signals that do not expect a program to exit, simply
# let kill do it's job, and evaluate kills return for value
else # check_sig_type - signal is not used to terminate program
for pid in ${pidlist}; do
kill "${signal}" "${pid}"
if [ "${?}" -ne "0" ]; then return 1; fi
done
fi
}
################################################################################
# pidofproc() #
# Usage: pidofproc [-p pidfile] pathname #
# #
# Purpose: This function returns one or more pid(s) for a particular daemon #
# #
# Inputs: -p pidfile, use the specified pidfile instead of pidof #
# pathname, path to the specified program #
# #
# Return values (as defined by LSB status codes): #
# 0 - Success (PIDs to stdout) #
# 1 - Program is dead, PID file still exists (remaining PIDs output) #
# 3 - Program is not running (no output) #
################################################################################
pidofproc()
{
local pidfile
local program
local prefix
local progname
local pidlist
local lpids
local exitstatus="0"
# Process arguments
while true; do
case "${1}" in
-p)
pidfile="${2}"
shift 2
;;
*)
program="${1}"
if [ -n "${2}" ]; then
# Too many arguments
# Since this is status, return unknown
return 4
else
break
fi
;;
esac
done
# If a PID file is not specified, try and find one.
if [ -z "${pidfile}" ]; then
# Get the program's basename
prefix=`echo "${program}" | sed 's/[^/]*$//'`
progname=`echo "${program}" | sed "s@${prefix}@@"`
# If a PID file exists with that name, assume that is it.
if [ -e "/var/run/${progname}.pid" ]; then
pidfile="/var/run/${progname}.pid"
fi
fi
# If a PID file is set and exists, use it.
if [ -n "${pidfile}" -a -e "${pidfile}" ]; then
# Use the value in the first line of the pidfile
pidlist=`/bin/head -n1 "${pidfile}"`
# This can optionally be written as 'sed 1q' to repalce 'head -n1'
# should LFS move /bin/head to /usr/bin/head
else
# Use pidof
pidlist=`pidof "${program}"`
fi
# Figure out if all listed PIDs are running.
for pid in ${pidlist}; do
kill -0 ${pid} 2> /dev/null
if [ "${?}" -eq "0" ]; then
lpids="${pids}${pid} "
else
exitstatus="1"
fi
done
if [ -z "${lpids}" -a ! -f "${pidfile}" ]; then
return 3
else
echo "${lpids}"
return "${exitstatus}"
fi
}
################################################################################
# timespec() #
# #
# Purpose: An internal utility function to format a timestamp #
# a boot log file. Sets the STAMP variable. #
# #
# Return value: Not used #
################################################################################
timespec()
{
STAMP="$(echo `date +"%b %d %T %:z"` `hostname`) "
return 0
}
################################################################################
# log_success_msg() #
# Usage: log_success_msg ["message"] #
# #
# Purpose: Print a successful status message to the screen and #
# a boot log file. #
# #
# Inputs: $@ - Message #
# #
# Return values: Not used #
################################################################################
log_success_msg()
{
echo -n -e "${@}"
echo -e "${SET_COL}${BRACKET}[${SUCCESS} OK ${BRACKET}]${NORMAL}"
timespec
echo -e "${STAMP} ${@} OK" >> ${BOOTLOG}
return 0
}
log_success_msg2()
{
echo -n -e "${@}"
echo -e "${SET_COL}${BRACKET}[${SUCCESS} OK ${BRACKET}]${NORMAL}"
echo " OK" >> ${BOOTLOG}
return 0
}
################################################################################
# log_failure_msg() #
# Usage: log_failure_msg ["message"] #
# #
# Purpose: Print a failure status message to the screen and #
# a boot log file. #
# #
# Inputs: $@ - Message #
# #
# Return values: Not used #
################################################################################
log_failure_msg()
{
echo -n -e "${@}"
echo -e "${SET_COL}${BRACKET}[${FAILURE} FAIL ${BRACKET}]${NORMAL}"
timespec
echo -e "${STAMP} ${@} FAIL" >> ${BOOTLOG}
return 0
}
log_failure_msg2()
{
echo -n -e "${@}"
echo -e "${SET_COL}${BRACKET}[${FAILURE} FAIL ${BRACKET}]${NORMAL}"
echo "FAIL" >> ${BOOTLOG}
return 0
}
################################################################################
# log_warning_msg() #
# Usage: log_warning_msg ["message"] #
# #
# Purpose: Print a warning status message to the screen and #
# a boot log file. #
# #
# Return values: Not used #
################################################################################
log_warning_msg()
{
echo -n -e "${@}"
echo -e "${SET_COL}${BRACKET}[${WARNING} WARN ${BRACKET}]${NORMAL}"
timespec
echo -e "${STAMP} ${@} WARN" >> ${BOOTLOG}
return 0
}
################################################################################
# log_info_msg() #
# Usage: log_info_msg message #
# #
# Purpose: Print an information message to the screen and #
# a boot log file. Does not print a trailing newline character. #
# #
# Return values: Not used #
################################################################################
log_info_msg()
{
echo -n -e "${@}"
timespec
echo -n -e "${STAMP} ${@}" >> ${BOOTLOG}
return 0
}
log_info_msg2()
{
echo -n -e "${@}"
echo -n -e "${@}" >> ${BOOTLOG}
return 0
}
################################################################################
# evaluate_retval() #
# Usage: Evaluate a return value and print success or failyure as appropriate #
# #
# Purpose: Convenience function to terminate an info message #
# #
# Return values: Not used #
################################################################################
evaluate_retval()
{
local error_value="${?}"
if [ ${error_value} = 0 ]; then
log_success_msg2
else
log_failure_msg2
fi
}
################################################################################
# check_signal() #
# Usage: check_signal [ -{signal} | {signal} ] #
# #
# Purpose: Check for a valid signal. This is not defined by any LSB draft, #
# however, it is required to check the signals to determine if the #
# signals chosen are invalid arguments to the other functions. #
# #
# Inputs: Accepts a single string value in the form or -{signal} or {signal} #
# #
# Return values: #
# 0 - Success (signal is valid #
# 1 - Signal is not valid #
################################################################################
check_signal()
{
local valsig
# Add error handling for invalid signals
valsig="-ALRM -HUP -INT -KILL -PIPE -POLL -PROF -TERM -USR1 -USR2"
valsig="${valsig} -VTALRM -STKFLT -PWR -WINCH -CHLD -URG -TSTP -TTIN"
valsig="${valsig} -TTOU -STOP -CONT -ABRT -FPE -ILL -QUIT -SEGV -TRAP"
valsig="${valsig} -SYS -EMT -BUS -XCPU -XFSZ -0 -1 -2 -3 -4 -5 -6 -8 -9"
valsig="${valsig} -11 -13 -14 -15"
echo "${valsig}" | grep -- " ${1} " > /dev/null
if [ "${?}" -eq "0" ]; then
return 0
else
return 1
fi
}
################################################################################
# check_sig_type() #
# Usage: check_signal [ -{signal} | {signal} ] #
# #
# Purpose: Check if signal is a program termination signal or a control signal #
# This is not defined by any LSB draft, however, it is required to #
# check the signals to determine if they are intended to end a #
# program or simply to control it. #
# #
# Inputs: Accepts a single string value in the form or -{signal} or {signal} #
# #
# Return values: #
# 0 - Signal is used for program termination #
# 1 - Signal is used for program control #
################################################################################
check_sig_type()
{
local valsig
# The list of termination signals (limited to generally used items)
valsig="-ALRM -INT -KILL -TERM -PWR -STOP -ABRT -QUIT -2 -3 -6 -9 -14 -15"
echo "${valsig}" | grep -- " ${1} " > /dev/null
if [ "${?}" -eq "0" ]; then
return 0
else
return 1
fi
}
################################################################################
# wait_for_user() #
# #
# Purpose: Wait for the user to respond if not a headless system #
# #
################################################################################
wait_for_user()
{
# Wait for the user by default
[ "${HEADLESS=0}" = "0" ] && read ENTER
return 0
}
# End /lib/lsb/init-functions