Re: GNU readline / tty related questions

In article <1180103675.094305.230600@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
emiller_news@xxxxxxxxx wrote:

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.

The readline library probably only processes control characters
specially when its input is a tty, not a pipe.


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?

Use a pseudo-tty (pty) rather than a pipe. You might want to make use
of Expect, a scripting language specifically designed for controlling
interactive programs.

--
Barry Margolin, barmar@xxxxxxxxxxxx
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
*** PLEASE don't copy me on replies, I'll read them in the group ***
.

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