[lttng-tools.git] / extras / core-handler / handler.sh

#!/bin/sh
#
# Copyright (C) 2013 - Christian Babeux <christian.babeux@efficios.com>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; only version 2
# of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#

# System binaries paths.
CAT_BIN="cat"
PGREP_BIN="pgrep"
MKDIR_BIN="mkdir"
LTTNG_BIN="lttng"

# Core file settings.
CORE_PATH="/tmp/lttng/core"
CORE_PREFIX="core"

# Folder where to save snapshot output.
# Can also be a remote URI.
SNAPSHOT_PATH="/tmp/lttng/snapshot"
SNAPSHOT_OUTPUT="file://${SNAPSHOT_PATH}"

# Sessiond binary name.
SESSIOND_BIN_NAME="lttng-sessiond"

# Core specifiers, see man core(5)

p=$1 # PID of dumped process
u=$2 # (numeric) real UID of dumped process
g=$3 # (numeric) real GID of dumped process
s=$4 # number of signal causing dump
t=$5 # time of dump, expressed as seconds since the Epoch,
     # 1970-01-01 00:00:00 +0000 (UTC)
h=$6 # hostname (same as nodename returned by uname(2))
e=$7 # executable filename (without path prefix)
E=$8 # pathname of executable, with slashes ('/') replaced
     # by exclamation marks ('!').
c=$9 # core file size soft resource limit of crashing process
     # (since Linux 2.6.24)

# Save core dump from stdin.
$MKDIR_BIN -p "${CORE_PATH}"
$CAT_BIN - > "${CORE_PATH}/${CORE_PREFIX}.$p"

# Optional, chain core dump handler with original systemd script.
#$CAT_BIN - | /usr/lib/systemd/systemd-coredump $p $u $g $s $t $e

# TODO: Checking for a sessiond lockfile would be more appropriate.
if $PGREP_BIN -u root "${SESSIOND_BIN_NAME}" > /dev/null 2>&1
then
    # Since we are called via the kernel coredump mechanism, we need to
    # setup our environment manually.
    #
    # The lttng command line tool lookup $HOME to adjust the .lttngrc
    # path. This is useful to have automatic session name lookup.
    export HOME="/root"
    $MKDIR_BIN -p "${SNAPSHOT_PATH}"
    $LTTNG_BIN snapshot add-output "${SNAPSHOT_OUTPUT}" > /dev/null 2>&1
    $LTTNG_BIN snapshot record > /dev/null 2>&1
fi
Commit	Line	Data
	1	#!/bin/sh
	2	#
	3	# Copyright (C) 2013 - Christian Babeux <christian.babeux@efficios.com>
	4	#
	5	# This program is free software; you can redistribute it and/or
	6	# modify it under the terms of the GNU General Public License
	7	# as published by the Free Software Foundation; only version 2
	8	# of the License.
	9	#
	10	# This program is distributed in the hope that it will be useful,
	11	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	# GNU General Public License for more details.
	14	#
	15	# You should have received a copy of the GNU General Public License
	16	# along with this program; if not, write to the Free Software
	17	# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	18	#
	19
	20	# System binaries paths.
	21	CAT_BIN="cat"
	22	PGREP_BIN="pgrep"
	23	MKDIR_BIN="mkdir"
	24	LTTNG_BIN="lttng"
	25
	26	# Core file settings.
	27	CORE_PATH="/tmp/lttng/core"
	28	CORE_PREFIX="core"
	29
	30	# Folder where to save snapshot output.
	31	# Can also be a remote URI.
	32	SNAPSHOT_PATH="/tmp/lttng/snapshot"
	33	SNAPSHOT_OUTPUT="file://${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