GNU readline / tty related questions

Hi,
I have to control a tool "A", that uses the GNU readline library for
it's command line, 'remotely' from another process "B". Currently I
send commands to and receive the output from the tool "A" via pipes.

The problem is that for example sending a <Tab> from "B" to "A"
doesn't start Tab-Completion and <Cursor-Up> doesn't read from the
history.

How can I have every key, that is typed in "B", sent to "A" so that it
is immediately interpreted as if it was typed in "A"s command line?

A problem that is probably related to this question is that, when
starting "A" via "execl(".../tool",...)" inside "B", the tool "A"
recognizes by calling isatty(), that it is not connected to a
terminal. Can I attach it to a tty before or after "execl()"? If not,
another option is to start "A" first on a terminal, if I can later
grab/send to that terminal from the control process "B" as mentioned
above.

Any clues how to do this?

Thanks
Edi

.

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