extras/core-handler/handler.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (C) 2013 - Christian Babeux <christian.babeux@efficios.com>
   4 #
   5 # This program is free software; you can redistribute it and/or
   6 # modify it under the terms of the GNU General Public License
   7 # as published by the Free Software Foundation; only version 2
   8 # of the License.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program; if not, write to the Free Software
  17 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18 #
  19
  20 # System binaries paths.
  21 CAT_BIN="cat"
  22 PGREP_BIN="pgrep"
  23 MKDIR_BIN="mkdir"
  24 LTTNG_BIN="lttng"
  25
  26 # Core file settings.
  27 CORE_PATH="/tmp/lttng/core"
  28 CORE_PREFIX="core"
  29
  30 # Folder where to save snapshot output.
  31 # Can also be a remote URI.
  32 SNAPSHOT_PATH="/tmp/lttng/snapshot"
  33 SNAPSHOT_OUTPUT="file://${SNAPSHOT_PATH}"
  34
  35 # Sessiond binary name.
  36 SESSIOND_BIN_NAME="lttng-sessiond"
  37
  38 # Core specifiers, see man core(5)
  39
  40 p=$1 # PID of dumped process
  41 u=$2 # (numeric) real UID of dumped process
  42 g=$3 # (numeric) real GID of dumped process
  43 s=$4 # number of signal causing dump
  44 t=$5 # time of dump, expressed as seconds since the Epoch,
  45      # 1970-01-01 00:00:00 +0000 (UTC)
  46 h=$6 # hostname (same as nodename returned by uname(2))
  47 e=$7 # executable filename (without path prefix)
  48 E=$8 # pathname of executable, with slashes ('/') replaced
  49      # by exclamation marks ('!').
  50 c=$9 # core file size soft resource limit of crashing process
  51      # (since Linux 2.6.24)
  52
  53 # Save core dump from stdin.
  54 $MKDIR_BIN -p "${CORE_PATH}"
  55 $CAT_BIN - > "${CORE_PATH}/${CORE_PREFIX}.$p"
  56
  57 # Optional, chain core dump handler with original systemd script.
  58 #$CAT_BIN - | /usr/lib/systemd/systemd-coredump $p $u $g $s $t $e
  59
  60 # TODO: Checking for a sessiond lockfile would be more appropriate.
  61 if $PGREP_BIN -u root "${SESSIOND_BIN_NAME}" > /dev/null 2>&1
  62 then
  63     # Since we are called via the kernel coredump mechanism, we need to
  64     # setup our environment manually.
  65     #
  66     # The lttng command line tool lookup $HOME to adjust the .lttngrc
  67     # path. This is useful to have automatic session name lookup.
  68     export HOME="/root"
  69     $MKDIR_BIN -p "${SNAPSHOT_PATH}"
  70     $LTTNG_BIN snapshot add-output "${SNAPSHOT_OUTPUT}" > /dev/null 2>&1
  71     $LTTNG_BIN snapshot record > /dev/null 2>&1
  72 fi