terminate background sudo

01-sudo.sh

#!/usr/bin/env bash

psudo() {
  sudo --validate
  dir=$(mktemp -d)
  mkfifo ${dir}/pipe
  sudo sh -c "echo \$\$ >${dir}/pipe; exec $*" &
  pid=$(cat ${dir}/pipe)
  rm -rf ${dir}
}

sudo --validate

echo "start"
sudo sleep 100 &
echo $!
pstree -pT $!
ps $!

for signal in SIGTERM; do
  echo ${signal}
  kill -${signal} $!
  echo $?
  pstree -pT $!
  if ! ps $!; then
    break
  fi
done

echo "wait"
time wait $!
echo $?
pstree -pT $!
ps $!

02-output

start
3479154
sudo(3479154)───sudo(3479156)───sleep(3479157)
    PID TTY      STAT   TIME COMMAND
3479154 pts/12   S+     0:00 sudo sleep 100
SIGTERM
0
    PID TTY      STAT   TIME COMMAND
wait

real    0m0.000s
user    0m0.000s
sys     0m0.000s
143
    PID TTY      STAT   TIME COMMAND