ctrl-c not working

[Thomas Schweikle]

Having following scripts:

bin/tc:
--- <snip>
#!/usr/bin/bash

host=""
loop=0
conf=default
port=22
user=$USERNAME
cssh=1
cping=1
recon=0

while [ -n "$1" ]; do
  case "$1" in
    -f)     conf="$2";      shift ;;
    -h)     host="$2";      shift ;;
    -l)     loop=1                ;;
    -nping) cping=0               ;;
    -nssh)  cssh=0                ;;
    -p)     port="$2";      shift ;;
    -u)     user="$2";      shift ;;
    *)      echo "$0: Error: Unknown option: \"$1\"!" ;;
  esac
  shift
done

if [ -e $conf ]; then
  conf="$PWD/$conf"
elif [ -e $HOME/.mintty/$conf ]; then
  conf="$HOME/.mintty/$conf"
else
  echo "$0: Error: Unknown config-file: \"$conf\" - not found in
\"$PWD\"; \"$HOME/.mintty\"!"
fi

mintty -s 132,43 -t "${user}@${host}" \
  -c "${conf}" \
  -e _ssh "$user" "$host" "$port" "$conf" "$loop" "$cssh" "$cping" &
--- <snap>

and bin/_ssh:
--- <snip>
#!/usr/bin/bash

user=$1
host=$2
port=$3
conf=$4
loop=$5
cssh=$6
cping=$7

while :; do
  printf '\x2d %s ssh connect ' ${host}
  if [ "$host" == "localhost" ]; then
    exec /usr/bin/bash -l
  else
    while :; do
      if [ $cping -ne 0 ]; then
        if ( ! ping -n 1 ${host} > /dev/null 2>&1 ); then
          printf '.'
 sleep 1
          continue
        fi
      fi
      if [ $cssh -ne 0 ]; then
        if ( ! nc -z ${host} ${port} > /dev/null 2>&1 ); then
          printf '/'
 sleep 1
          continue
        fi
      fi
      break
    done
    printf '\n'
    /usr/bin/ssh \
      -o UserKnownHostsFile=/dev/null \
      -o StrictHostKeyChecking=no -X -K \
      -p ${port} \
      -l ${user} ${host}
    [[ $loop -eq 0 ]] && break
    printf 'Reconnecting ...'; sleep 3
    printf '\n'
  fi
done
--- <snap>

started by:
C:\cygwin\bin\bash.exe -l -c "tc -f tpstest -l -u root -h fbsd12-64"

does what it is expected to do: starting mintty, then checking
reachability of the given host. If the host is reachable ssh is
started and connects to the host. If the host is gonig down
intentionally or not, it tries again to reach the host and if it is
reachable connects again to it.

Now if I type ctrl-c while trying to connect nothing happens. But I'd
like the script to bail out, terminating. But nothing works: ctrl-c
doesn't ctrl-z doesn't. I only can kill -9 the bash associated with
it.
How do I get ctrl-c to work?

-- 
Thomas

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