Add core dump snapshot handler script
[lttng-tools.git] / 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
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