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#!/bin/bash
[ "$BASH" ] || { echo "Use bash >= 4"; exit 2; }
((BASH_VERSINFO[0] >= 4)) || { echo "Use bash >= 4"; exit 2; }
declare -A kill_time
declare -A exit_time
declare -a exit_seq
declare -A pid_comm
declare -A wait_time
declare -A killer
declare -A recv_sig
# ts, pid, signo
set_kill_time()
{
if [[ "${kill_time[$2]}" ]]; then
return
fi
case "$3" in
0 | 1 | 2 | 3 | 6 | 9 | 15)
kill_time[$2]=$1
;;
esac
}
# ts, pid
set_exit_time()
{
if [[ "${exit_time[$2]}" ]]; then
return
fi
exit_time[$2]=$1
exit_seq+=("$pid")
}
# pid, target_pid, signo
add_killer()
{
killer[$1]+=" $3>$target_pid"
}
#ts, pid, signo
add_signal()
{
recv_sig[$2]+=" $3($1)"
}
# https://kernel.org/doc/Documentation/trace/ftrace.txt
declare -i lineno=0
while read -r line; do
let lineno++
if [[ $line == '' || $line == '#'* ]]; then
continue
fi
read -r -a cols <<< "$line"
comm=${cols[0]%-*}
pid=${cols[0]#$comm-}
ts=${cols[3]%:}
ts=${ts//./}
func=${cols[4]%(*}
func=${func%:}
if [[ -z "$shut_time" ]]; then
shut_time=$ts
ts=0
else
zeros=000000
((ts-=shut_time))
if (( 6 >= ${#ts} )); then
ts=${zeros:0:7-${#ts}}$ts
fi
ts=${ts:0:${#ts}-6}.${ts:${#ts}-6}
fi
case "$func" in
sched_process_exit)
set_exit_time "$ts" "$pid"
comm="${cols[5]#comm=}"
;;
sys_kill | sys_tgkill)
if [[ '->' == "${cols[5]}" ]]; then
if [[ '0x0' != "${cols[6]}" ]]; then
target_pid=${killer[$pid]##*>}
if [[ "$target_pid" ]]; then
add_killer "$pid" "$target_pid" "$signo"
set_exit_time "$ts" "$target_pid"
fi
fi
else
let target_pid=0x${cols[5]%,}
if [[ 'sys_kill' == "$func" ]]; then
let signo=0x${cols[7]%)}
else
let signo=0x${cols[9]%)}
fi
set_kill_time "$ts" "$target_pid" "$signo"
add_killer "$pid" "$target_pid" "$signo"
fi
;;
signal_deliver)
let signo=${cols[5]#sig=}
add_signal "$ts" "$pid" "$signo"
;;
sys_exit)
set_kill_time "$ts" "$pid" -
;;
esac
if [[ -z "${pid_comm[$pid]}" || '<...>' == "${pid_comm[$pid]}" ]]; then
pid_comm[$pid]=$comm
fi
done
for pid in "${exit_seq[@]}"; do
printf "%15s(%4s) exited at %10ss, got signals: %s\n" "${pid_comm[$pid]}" "$pid" "${exit_time[$pid]}" "${recv_sig[$pid]}"
done
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