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# Common bash(1) procedures to be used in the Performance Co-Pilot
# Bash PMDA trace instrumentation mechanism
#
# Copyright (c) 2012 Nathan Scott. All Rights Reserved.
#
# 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; either version 2 of the License, or (at your
# option) any later version.
#
# 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.
pcp_trace()
{
command="$1"
shift
case "$command"
in
setup|init)
[ -z "${PCP_TMP_DIR}" ] && return 0 # incorrect call sequence
trap "pcp_trace off" 0
export PCP_TRACE_DIR="${PCP_TMP_DIR}/pmdabash"
export PCP_TRACE_HEADER="${PCP_TRACE_DIR}/.$$"
export PCP_TRACE_DATA="${PCP_TRACE_DIR}/$$"
;;
stop|off)
exec 99>/dev/null
# unlink is performed by pmdabash to resolve race conditions
unset BASH_XTRACEFD PCP_TRACE_DIR PCP_TRACE_HEADER PCP_TRACE_DATA
;;
start|on)
# series of sanity checks first
[ -n "${BASH_VERSION}" ] || return 0 # wrong shell
[ "${BASH_VERSINFO[0]}" -ge 4 ] || return 0 # no support
[ "${BASH_VERSINFO[0]}" -ne 4 -o "${BASH_VERSINFO[1]}" -ge 2 ] || \
return 0 # no support
[ -z "${PCP_TMP_DIR}" ] && return 0 # incorrect setup
[ -z "${PCP_TRACE_DIR}" ] && pcp_trace init $@ # not yet tracing
[ -d "${PCP_TRACE_DIR}" ] || return 0 # no pcp pmda yet
# is this the child of a traced shell?
[ -e /proc/self/fd/99 ] && pcp_trace init $@
trap "pcp_trace on" 13 # reset on sigpipe (consumer died)
printf -v PCP_START '%(%s)T' -2
mkfifo -m 600 "${PCP_TRACE_DATA}" 2>/dev/null || return 0
# header: version, command, parent, and start time
echo "version:1 ppid:${PPID} date:${PCP_START} + $@" \
> "${PCP_TRACE_HEADER}" || return 0
# setup link between xtrace & fifo
exec 99>"${PCP_TRACE_DATA}"
BASH_XTRACEFD=99 # magic bash environment variable
set -o xtrace # start tracing from here onward
# traces: time, line#, and (optionally) function
PS4='time:${SECONDS} line:${LINENO} func:${FUNCNAME[0]-} + '
;;
esac
}
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