Stop echo and consume all user input in Bash - bash

Question

TARGET
Until some sub-task in script completes its job:
stop echo;
disable cursor;
consume all user input;
do not block interrupts (Ctrl+C, etc.).
WHAT HAVE DONE
For now, using this answer, I create few functions for that, here they are:
function hide_input()
{
if [ -t 0 ]; then
stty -echo -icanon time 0 min 0
fi
}
function reset_input()
{
if [ -t 0 ]; then
stty sane
fi
}
function stop_interactive()
{
trap reset_input EXIT
trap hide_input CONT
hide_input
tput civis
}
function start_interactive()
{
tput cnorm
reset_input
}
function consume_input()
{
local line
while read line; do line=''; done
}
And here is the way they are used:
echo "Warn the user: the job will be started."
read -p "Continue? [yes/no] > "
if [ "$REPLY" == "yes" ]; then
stop_interactive # <== from here all input should be rejected
echo "Notify the user: job starting..."
# << ------ here goes some long job with output to terminal ------>
echo "Notify the user: job done!"
consume_input # <== here I trying to get all user input and put nowhere
start_interactive # <== from here restore normal operation
else
echo "Aborted!"
exit 0
fi
THE PROBLEM
The problem is: current 'solution' does not work. When I press keys during long running job they appears on the screen, and pressing 'Enter' ruins all output with cursor movements. Furthermore, after 'start_interactive' function call all input appears on the terminal screen.
What is the right solution for this task?
SOLUTION
Final working solution is:
function hide_input()
{
if [ -t 0 ]; then
stty -echo -icanon time 0 min 0
fi
}
function reset_input()
{
if [ -t 0 ]; then
stty sane
fi
}
function consume_input()
{
local line
while read line; do line=''; done
}
function stop_interactive()
{
trap reset_input EXIT
trap hide_input CONT
hide_input
tput civis
}
function start_interactive()
{
consume_input
trap - EXIT
trap - CONT
tput cnorm
reset_input
}
echo "Warn the user: the job will be started."
read -p "Continue? [yes/no] > "
if [ "$REPLY" == "yes" ]; then
stop_interactive
echo "Notify the user: job starting..."
do_the_job &
pid=$!
while ps $pid > /dev/null ; do
consume_input
done
echo "Notify the user: job done!"
start_interactive
else
echo "Aborted!"
exit 0
fi

Answer 1

Based in your question, there are many questions "why" if I look at your code. If you do not want to change the behavior of ^C etc., then don't use traps. All your functions test whether the file descriptor 0 is a terminal. Do you plan to use the script in a pipe? Also, your consuming of user input will continue until end-of-file, so the script may never end.
Based on your question, I would write something like this:
echo "Warn the user: the job will be started."
read -p "Continue? [yes/no] > "
if [ "$REPLY" == "yes" ]; then
stty -echo
echo "Notify the user: job starting..."
program_to_execute &
pid=$!
while ps $pid > /dev/null ; do
read -t 1 line
done
echo "Notify the user: job done!"
else
echo "Aborted!"
fi
stty sane