package/ltt/S27tracer

   1 #!/bin/sh
   2 #
   3 # Load tracer module and create tracer device node.
   4 #
   5
   6 MODULE="tracer"
   7 MAIN_DEVICE="tracer"
   8 USER_DEVICE="tracerU"
   9 GROUP="root"
  10 MODE="664"
  11
  12 start() {
  13         if [ -e /dev/${MAIN_DEVICE} -o -e /dev/${USER_DEVICE} ]
  14         then
  15             # tell the user about what we are doing
  16             echo "Deleting old tracer nodes: /dev/tracer and /dev/tracerU"
  17
  18             # remove stale nodes
  19             rm -f /dev/${MAIN_DEVICE}
  20             rm -f /dev/${USER_DEVICE}
  21         fi
  22
  23         # look for the major number
  24         MAJOR=`/bin/grep " ${MODULE}$" /proc/devices | cut -d" " -f1`
  25
  26         # does the device exist?
  27         if [ ${MAJOR} ]
  28         then
  29             echo "Found tracer device with major number:" ${MAJOR}
  30         else
  31             echo "Loading tracer kernel module: "
  32             # invoke modprobe
  33             /sbin/modprobe ${MODULE}
  34             MAJOR=`/bin/grep " ${MODULE}$" /proc/devices | cut -d" " -f1`
  35             if [ ${MAJOR} ]
  36             then
  37                 echo "Found tracer device with major number:" ${MAJOR}
  38             else
  39                 echo "Did not find tracer device ... /dev entries not created ..."
  40                 exit 1
  41             fi
  42         fi
  43
  44         # tell the user about what we are doing
  45         echo "Creating new tracer nodes: /dev/tracer and /dev/tracerU"
  46
  47         # create the character special file
  48         /bin/mknod /dev/${MAIN_DEVICE} c ${MAJOR} 0
  49         /bin/mknod /dev/${USER_DEVICE} c ${MAJOR} 1
  50
  51         # set permissions and ownership
  52         /bin/chgrp ${GROUP} /dev/${MAIN_DEVICE}
  53         /bin/chmod ${MODE}  /dev/${MAIN_DEVICE}
  54         /bin/chgrp ${GROUP} /dev/${USER_DEVICE}
  55         /bin/chmod ${MODE}  /dev/${USER_DEVICE}
  56 }
  57 stop() {
  58         # tell the user about what we are doing
  59         echo "Deleting tracer nodes: /dev/tracer and /dev/tracerU"
  60
  61         # remove nodes
  62         rm -f /dev/${MAIN_DEVICE}
  63         rm -f /dev/${USER_DEVICE}
  64
  65         if lsmod | /bin/grep "^${MODULE} "
  66         then
  67             echo -n "Removing tracer kernel module: "
  68             # invoke modprobe -r
  69             /sbin/modprobe -r ${MODULE}
  70             echo "OK"
  71         fi
  72 }
  73 restart() {
  74         stop
  75         start
  76 }
  77
  78 case "$1" in
  79   start)
  80         start
  81         ;;
  82   stop)
  83         stop
  84         ;;
  85   restart|reload)
  86         restart
  87         ;;
  88   *)
  89         echo $"Usage: $0 {start|stop|restart}"
  90         exit 1
  91 esac
  92
  93 exit $?