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Script to switch console attached to a command (for Linux)
#!/bin/bash
# For example: switch-tty.sh `pidof vi` `tty`
target=$1
dest=$2
if [ -z "$target" -o -z "$dest" ]; then
echo "usage: $0 pid target"
exit 1
fi
current="$(readlink /proc/$target/fd/0)"
echo "Current stdin: $current"
if [ "$current" = "$dest" ]; then
echo "no switch is required."
exit 1
fi
tty>/dev/null < "$current" && srctty=1
tty>/dev/null < "$dest" && desttty=1
tty>/dev/null && istty=1
[ -n "$istty" -a "$(tty)" = "$dest" ] && thistty=1
fds=()
for x in /proc/$target/fd/*; do
if [ "$current" = "$(readlink $x)" ]; then
fd=${x##*/}
fds=(${fds[@]} $fd)
fi
done
echo "Target fds: ${fds[@]}"
leader=$( ps a | grep "${dest#/dev/}" | setsid grep Ss | cut -f 1 -d \ )
echo "session leader: $leader"
[ -n "$thistty" ] && echo "Switching to this TTY"
echo -n "Continue? (y/N) "
read
[ "$REPLY" != "y" -a "$REPLY" != "Y" ] && exit 2
( echo "p open(\"$dest\", 2)"; for x in ${fds[@]}; do echo "p dup2(\$1, $x)"; done; echo "p close(\$1)"; echo "detach"; echo "quit" ) | gdb -p $target
if [ -n "$srctty" -a -n "$desttty" ]; then
stty -F $dest "$( stty -g -F "$current" )"
[ -n "$thistty" ] && clear
kill -STOP $leader
kill -STOP $target
sleep 1
kill -CONT $target
kill -WINCH $target
fi
[ -n "$thistty" ] && while :; do sleep 60; kill -0 $target || break; done
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