by jbw » Fri, 19 Mar 1999 04:00:00
I gave an answer to my question :
how does one use xterm in slave mode -SccN ?
however the terminal I get has cooked I/O,
so my next question is how does one change the tty modes (to raw, -echo)
for a terminal that is not stdin ? I have both name and file descriptor.
The best answer I have requires c, and the use of termios, but
I have not yet got it to work. Is there a standard unix command for this
that I am not seeing when I use man -k ?
cheers
beau webber
by Ken Pizzi » Fri, 19 Mar 1999 04:00:00
>The best answer I have requires c, and the use of termios, but
>I have not yet got it to work. Is there a standard unix command for this
>that I am not seeing when I use man -k ?
You may want to double-check the man page for stty; some
versions of stty do their work on stdout, though most (these
days) work on their stdin.
--Ken Pizzini
1. Why does STDIO buffer to a pipe, but not to a TTY?
I was trying to interactively control a program through a pipe (in the manner
of Expect), but I soon learned that any application that uses STDIO without
explicitely flushing will deadlock the pipe. The answer was to use a
pseudo-TTY. That also fixes the problem of talking to programs like SSH which
will try to read and write directly to the controlling TTY instead of to the
stdin/stdout.
The question is, how does the pseudo tty make a difference? If the application
under control does not know the difference, then how does the ptty help. As far
as I know there is no way to force the slave to flush its buffers.
I'm asking this for just my general knowledge. I got my application to work,
but my initial reasoning for why it works no longer makes sense to me. I think
that maybe I might be misunderstanding the original pipe problem and perhaps my
switching to a pty solved the problem, but not for the reason I explained above.
Yours,
Noah
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