#! /bin/sh
# This code is Bourne Shell for maximal portability.
##
# SWISH++
# searchmonitor -- search daemon monitor
#
# Copyright (C) 2001 Paul J. Lucas
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
##
##
# What stuff is called and where it's located.
##
LOG="logger -t search -p daemon"
SEARCH_DEFAULT="/usr/bin/search++"
##
# You may need to set LD_LIBRARY_PATH to contain the directory of the C++
# run-time library, e.g. libstdc++.so if g++ was used to compile SWISH++.
##
#LD_LIBRARY_PATH=/usr/local/lib
#export LD_LIBRARY_PATH
########### You shouldn't have to change anything below this line. ############
ME=`basename $0`
USAGE="usage: $ME [-c conf_file] [-s search_path]"
##
# Parse command-line options.
##
while getopts Bc:s: opt
do
case $opt in
B) NO_BACKGROUND=true ;;
c) CONF_FILE="$OPTARG" ;;
s) SEARCH="$OPTARG" ;;
?) echo $USAGE >&2; exit 1 ;;
esac
done
shift `expr $OPTIND - 1`
##
# Check for existence of configuration file.
##
if [ -n "$CONF_FILE" ]
then
[ -f "$CONF_FILE" ] || { echo "$ME: $CONF_FILE not found" >&2; exit 3; }
else
CONF_FILE="swish++.conf"
if [ ! -f "$CONF_FILE" ]
then
CONF_FILE="/etc/$CONF_FILE"
[ -f "$CONF_FILE" ] ||
{ echo "$ME: no configuration file found" >&2; exit 3; }
fi
fi
##
# Check for existence of search.
##
[ -z "$SEARCH" ] && SEARCH="$SEARCH_DEFAULT"
[ -f "$SEARCH" ] || { echo "$ME: $SEARCH not found" >&2; exit 2; }
##
# Determine the numeric value for SIGUSR2 that we use to kill search. By using
# a user-generated signal, if search gets killed and it was killed by SIGUSR2,
# then it MUST have been done by manual request.
##
KILL=`which kill` # ensure shell built-in isn't used
USR2=`$KILL -l USR2 2>&1`
##
# If we haven't already put ourselves into the background, call ourselves in
# the background (the child process) and immediately exit (as the parent
# process). This is effectively how to fork(2) in shell.
##
[ -z "$NO_BACKGROUND" ] && { $0 -B -c "$CONF_FILE" -s "$SEARCH" & exit 0; }
##
# Start search as a daemon and wait for it to exit. If it exited because of a
# condition that restarting might cure, restart it.
##
while true
do
$SEARCH -B -c $CONF_FILE
exit_code=$?
if [ $exit_code -lt 128 ]
then # it exited by itself
case $exit_code in
1) $LOG.alert "configuration file error; NOT restarting"; exit 0 ;;
2) $LOG.alert "usage error; NOT restarting"; exit 0 ;;
40) $LOG.alert "can't read index file; NOT restarting"; exit 0 ;;
51) $LOG.alert "can't write PID file; NOT restarting"; exit 0 ;;
52) $LOG.alert "bad host/IP; NOT restarting"; exit 0 ;;
53) $LOG.err "can't create TCP socket; restarting ..." ;;
54) $LOG.err "can't create Unix socket; restarting ..." ;;
55) $LOG.alert "can't delete Unix socket; NOT restarting"; exit 0 ;;
56) $LOG.err "can't bind TCP socket; restarting ..." ;;
57) $LOG.err "can't bind Unix socket; restarting ..." ;;
58) $LOG.err "can't listen TCP socket; restarting ..." ;;
59) $LOG.err "can't listen Unix socket; restarting ..." ;;
60) $LOG.err "can't select; restarting ..." ;;
61) $LOG.err "can't accept; restarting ..." ;;
62) $LOG.err "can't fork; restarting ..." ;;
63) $LOG.alert "can't cd /; NOT restarting"; exit 0 ;;
64) $LOG.err "can't create thread; restarting ..." ;;
65) $LOG.err "can't detach thread; restarting ..." ;;
66) $LOG.err "can't init thread condition; restarting ..." ;;
67) $LOG.err "can't init thread mutex; restarting ..." ;;
68) $LOG.alert "No such user; NOT restarting"; exit 0 ;;
69) $LOG.alert "No such group; NOT restarting"; exit 0 ;;
*) $LOG.err "exited with code $exit_code; restarting..." ;;
esac
else # it received a signal
sig=`expr $exit_code - 128`
if [ $sig -eq $USR2 ]
then
$LOG.notice "shut down by manual request via signal USR2"
exit 0
else
$LOG.err "died on signal $sig; restarting..."
fi
fi
sleep 5
done 2>/dev/null
# vim:set et sw=4 ts=4:
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