Tvheadend

I was doing some system updates that required stopping TVHeadEnd so I went into Webmin's "Bootup and Shutdown" section (yes that is the correct place to access startup scripts in Webmin) and stopped TVHeadEnd, and did what I needed to do, but after rebooting I found it would not start automatically at bootup, even if I specifically enabled that in Webmin. However I then applied an update to TVHeadEnd (I am running the unstable branch) and now it does start at boot again, but today the system crashed when I attempted to tune a "problem" channel (insufficient signal strength) and TVHeadEnd did not restart itself. I will include the startup script that Webmin thinks should be used at bootup and shutdown at the end of this post.

I can't imagine that Webmin did anything to alter the startup, it basically just takes what it thinks is the standard init script and uses that, but maybe when I disabled it temporarily it didn't get re-enabled correctly or something, but I don't know how to tell. Is there some Linux command I can use to check this? It seems to me as though in the past I have always seen two processes associated with TVHeadEnd, but now when I run ps -ax I see only this one:

/usr/bin/tvheadend -f -u hts -g video

Is there another "watchdog" type process that should be running (I always thought there was one called just tvh or hts or something like that, I thought it had a shorter name but maybe I'm imagining things), and if so how can I get it to start again?

I am running TVHeadEnd under Debian Wheezy, and before anyone gives me grief about using Webmin, I use it because it helps me with a lot of Linux-y stuff that I don't really understand otherwise, and I have never had a problem with stopping or starting processes in Webmin prior to this. This is the startup/shutdown script that Webmin thinks it should use. As I understand it, when you stop a process in Webmin all it does is call this script with the "stop" option, however I don't know how it removes it from or adds it to the list of startup items. Also Webmin doesn't even show a tvh or hts process in its list of available processes (normally it shows even disabled processes in the list).

#! /bin/sh
### BEGIN INIT INFO
# Provides:          tvheadend
# Required-Start:    $local_fs $remote_fs udev
# Required-Stop:     $local_fs $remote_fs
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
### END INIT INFO

# Author: Andreas Öman

# Do NOT "set -e" 

# PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=/usr/sbin:/usr/bin:/sbin:/bin
DESC="Tvheadend" 
NAME=tvheadend
DAEMON=/usr/bin/$NAME
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME

# Exit if the package is not installed
[ -x "$DAEMON" ] || exit 0

# Read configuration variable file if it is present
[ -r /etc/default/$NAME ] && . /etc/default/$NAME

# Configure command line options
[ "$TVH_ENABLED" = "1" ] || exit 0

ARGS="-f" 
[ -z "$TVH_USER"      ] || ARGS="$ARGS -u $TVH_USER" 
[ -z "$TVH_GROUP"     ] || ARGS="$ARGS -g $TVH_GROUP" 
[ -z "$TVH_CONF_DIR"  ] || ARGS="$ARGS -c $TVH_CONF_DIR" 
[ -z "$TVH_ADAPTERS"  ] || ARGS="$ARGS -a $TVH_ADAPTERS" 
[ "$TVH_IPV6" = "1"   ] && ARGS="$ARGS -6" 
[ -z "$TVH_HTTP_PORT" ] || ARGS="$ARGS --http_port $TVH_HTTP_PORT" 
[ -z "$TVH_HTTP_ROOT" ] || ARGS="$ARGS --http_root $TVH_HTTP_ROOT" 
[ -z "$TVH_HTSP_PORT" ] || ARGS="$ARGS --htsp_port $TVH_HTSP_PORT" 
[ -z "$TVH_ARGS"      ] || ARGS="$ARGS $TVH_ARGS" 
[ "$TVH_DEBUG" = "1"  ] && ARGS="$ARGS -s" 

# Load the VERBOSE setting and other rcS variables
[ -f /etc/default/rcS ] && . /etc/default/rcS

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
. /lib/lsb/init-functions

#
# Function that starts the daemon/service
#
do_start()
{
    # Return
    #   0 if daemon has been started
    #   1 if daemon was already running
    #   2 if daemon could not be started
        udevadm settle
    start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON --test > /dev/null \
        || return 1
    start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON -- \
        $ARGS \
        || return 2
}

#
# Function that stops the daemon/service
#
do_stop()
{
    # Return
    #   0 if daemon has been stopped
    #   1 if daemon was already stopped
    #   2 if daemon could not be stopped
    #   other if a failure occurred
    start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE --name $NAME
    RETVAL="$?" 
    [ "$RETVAL" = 2 ] && return 2
    # Many daemons don't delete their pidfiles when they exit.
    rm -f $PIDFILE
    return "$RETVAL" 
}

case "$1" in
  start)
    [ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME" 
    do_start
    case "$?" in
        0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
        2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
    esac
    ;;
  stop)
    [ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME" 
    do_stop
    case "$?" in
        0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
        2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
    esac
    ;;
  restart|force-reload)
    #
    # If the "reload" option is implemented then remove the
    # 'force-reload' alias
    #
    log_daemon_msg "Restarting $DESC" "$NAME" 
    do_stop
    case "$?" in
      0|1)
        do_start
        case "$?" in
            0) log_end_msg 0 ;;
            1) log_end_msg 1 ;; # Old process is still running
            *) log_end_msg 1 ;; # Failed to start
        esac
        ;;
      *)
          # Failed to stop
        log_end_msg 1
        ;;
    esac
    ;;
  *)
    echo "Usage: $SCRIPTNAME {start|stop|restart|force-reload}" >&2
    exit 3
    ;;
esac

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