usttrace

   1 #!/bin/bash
   2
   3 # usttrace  by Pierre-Marc Fournier 2009
   4 # Distributed under the GPLv2.
   5
   6 USTD="./ustd/ustd"
   7 LIBINTERFORK="./libinterfork/.libs/libinterfork.so"
   8
   9 BASE_TRACE_DIR="$HOME/.usttraces"
  10
  11 function usage () {
  12         echo "usage:  $0 COMMAND" 2>/dev/stderr
  13 }
  14
  15 function error() {
  16         echo "$0: error: $1" 2>/dev/stderr
  17 }
  18
  19 # Prepare vars
  20 CMD=$1
  21
  22 # Validate input
  23 if [ -z "$HOME" ];
  24 then
  25         error "no home specified"
  26 fi
  27
  28 if [ -z "$CMD" ];
  29 then
  30         error "no command specified"
  31         usage;
  32         exit 1
  33 fi
  34
  35 # Create directory for trace output
  36 DATESTRING="$(hostname)-$(date +%Y%m%d%H%M%S)"
  37 OUTDIR="$BASE_TRACE_DIR/$DATESTRING"
  38 mkdir -p "$OUTDIR"
  39
  40 # Choose socket path
  41 SOCKPATH="/tmp/ust-sock-$$"
  42
  43 # Start daemon
  44 $USTD -s "$SOCKPATH" -o "$OUTDIR" >"$OUTDIR/ustd.log" 2>&1 &
  45 USTDPID=$!
  46
  47 # Establish the environment for the command
  48 export UST_TRACE=1
  49 export UST_AUTOPROBE=1
  50 export UST_DAEMON_SOCKET="$SOCKPATH"
  51
  52 # Execute the command
  53 bash -c "$CMD"
  54
  55 ## Because of the keepalive mechanism, we're sure that by the time
  56 ## we get here, the daemon is connected to all the buffers that still exist.
  57 ## Therefore we can politely ask it to die when it's done.
  58
  59 kill -SIGTERM "$USTDPID"
  60
  61 # Tell the daemon to die
  62 echo "Waiting for ustd to shutdown..."
  63 wait "$USTDPID"