extras/core-handler/handler.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (C) 2013 Christian Babeux <christian.babeux@efficios.com>
   4 #
   5 # SPDX-License-Identifier: GPL-2.0-only
   6 #
   7
   8 # System binaries paths.
   9 CAT_BIN="cat"
  10 PGREP_BIN="pgrep"
  11 MKDIR_BIN="mkdir"
  12
  13 # Session name
  14 SESSION_NAME="coredump-handler"
  15
  16 # Sessiond binary name.
  17 SESSIOND_BIN_NAME="lttng-sessiond"
  18
  19 # TODO: Checking for a sessiond lockfile would be more appropriate.
  20 if $PGREP_BIN -u root "${SESSIOND_BIN_NAME}" > /dev/null 2>&1
  21 then
  22     $LTTNG_BIN snapshot record -s ${SESSION_NAME} > /dev/null 2>&1
  23 fi
  24
  25 # Core file settings.
  26 CORE_PATH="/tmp/lttng/core"
  27 CORE_PREFIX="core"
  28
  29 # Core specifiers, see man core(5)
  30
  31 p=$1 # PID of dumped process
  32 u=$2 # (numeric) real UID of dumped process
  33 g=$3 # (numeric) real GID of dumped process
  34 s=$4 # number of signal causing dump
  35 t=$5 # time of dump, expressed as seconds since the Epoch,
  36      # 1970-01-01 00:00:00 +0000 (UTC)
  37 h=$6 # hostname (same as nodename returned by uname(2))
  38 e=$7 # executable filename (without path prefix)
  39 E=$8 # pathname of executable, with slashes ('/') replaced
  40      # by exclamation marks ('!').
  41 c=$9 # core file size soft resource limit of crashing process
  42      # (since Linux 2.6.24)
  43
  44 # Save core dump from stdin.
  45 $MKDIR_BIN -p "${CORE_PATH}"
  46 $CAT_BIN - > "${CORE_PATH}/${CORE_PREFIX}.$p"
  47
  48 # Optional, chain core dump handler with original systemd script.
  49 #$CAT_BIN - | /usr/lib/systemd/systemd-coredump $p $u $g $s $t $e