Add core dump snapshot handler script
[lttng-tools.git] / extras / core-handler / handler.sh
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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.
21CAT_BIN="cat"
22PGREP_BIN="pgrep"
23MKDIR_BIN="mkdir"
24LTTNG_BIN="lttng"
25
26# Core file settings.
27CORE_PATH="/tmp/lttng/core"
28CORE_PREFIX="core"
29
30# Folder where to save snapshot output.
31# Can also be a remote URI.
32SNAPSHOT_PATH="/tmp/lttng/snapshot"
33SNAPSHOT_OUTPUT="file://${SNAPSHOT_PATH}"
34
35# Sessiond binary name.
36SESSIOND_BIN_NAME="lttng-sessiond"
37
38# Core specifiers, see man core(5)
39
40p=$1 # PID of dumped process
41u=$2 # (numeric) real UID of dumped process
42g=$3 # (numeric) real GID of dumped process
43s=$4 # number of signal causing dump
44t=$5 # time of dump, expressed as seconds since the Epoch,
45 # 1970-01-01 00:00:00 +0000 (UTC)
46h=$6 # hostname (same as nodename returned by uname(2))
47e=$7 # executable filename (without path prefix)
48E=$8 # pathname of executable, with slashes ('/') replaced
49 # by exclamation marks ('!').
50c=$9 # core file size soft resource limit of crashing process
51 # (since Linux 2.6.24)
52
53# Save core dump from stdin.
54$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.
61if $PGREP_BIN -u root "${SESSIOND_BIN_NAME}" > /dev/null 2>&1
62then
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
72fi
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