Fix: reset out_fd_offset when we rotate the trace file
[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
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26# Session name
27SESSION_NAME="coredump-handler"
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28
29# Sessiond binary name.
30SESSIOND_BIN_NAME="lttng-sessiond"
31
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32# Core file settings.
33CORE_PATH="/tmp/lttng/core"
34CORE_PREFIX="core"
35
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36# Core specifiers, see man core(5)
37
38p=$1 # PID of dumped process
39u=$2 # (numeric) real UID of dumped process
40g=$3 # (numeric) real GID of dumped process
41s=$4 # number of signal causing dump
42t=$5 # time of dump, expressed as seconds since the Epoch,
43 # 1970-01-01 00:00:00 +0000 (UTC)
44h=$6 # hostname (same as nodename returned by uname(2))
45e=$7 # executable filename (without path prefix)
46E=$8 # pathname of executable, with slashes ('/') replaced
47 # by exclamation marks ('!').
48c=$9 # core file size soft resource limit of crashing process
49 # (since Linux 2.6.24)
50
51# Save core dump from stdin.
52$MKDIR_BIN -p "${CORE_PATH}"
53$CAT_BIN - > "${CORE_PATH}/${CORE_PREFIX}.$p"
54
55# Optional, chain core dump handler with original systemd script.
56#$CAT_BIN - | /usr/lib/systemd/systemd-coredump $p $u $g $s $t $e
57
58# TODO: Checking for a sessiond lockfile would be more appropriate.
59if $PGREP_BIN -u root "${SESSIOND_BIN_NAME}" > /dev/null 2>&1
60then
c071ccd9 61 $LTTNG_BIN snapshot record -s ${SESSION_NAME} > /dev/null 2>&1
57f0bd0c 62fi
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