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Full Discussion: Terminal emulator from scratch.
Top Forums Programming Terminal emulator from scratch. Post 302504428 by Corona688 on Monday 14th of March 2011 02:41:30 PM
Old 03-14-2011
Quote:
Originally Posted by howdini
The only time I received an isatty related error was with a few interactive types of programs like top. It said that the tty check failed, just as you said some of them would. passwd on the other hand launches well and requests for some input.
If stdin isn't a terminal, it will open /dev/tty directly and talk to the terminal through that. This bypasses your pipes completely.
Quote:
getting it this input and retrieving the next output is proving to be the challenge. I hope you are not saying that this method completely cannot work with interactive programs.
I am; I tried to warn you about this from the beginning.

Not that this has been a waste of your time. There is a way to do this, closely related to what you've been doing -- instead of creating and duplicating pipes over things, create and duplicate a virtual terminal. It acts sort of like a pipe, with some important differences -- it's bidirectional, for one thing. And ctrl-c characters will cause the kernel to send SIGINT, etc, like you'd expect to happen in a terminal. here's an example I wrote back when I was playing with vterms and linked early in this thread. It'll be trickier than using pipes but related so it's a good thing to have gotten pipes working first.
 

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LEARN ABOUT DEBIAN

dict_lookup

DICT_LOOKUP(1)															    DICT_LOOKUP(1)

NAME

       dict_lookup - DICT Protocol Client

SYNOPSIS

       dict_lookuop [options]

DESCRIPTION

       dict_lookup  reads  X selection, then open terminal emulator and run dict client in it allowing user to view content using pager.  It makes
       sense to configure launching dict_lookup on a keyboard shortcut in the window manager.

OPTIONS

       -h     display help message.

       -x x   X coordinate of terminal emulator.

       -x Y   Y coordinate of terminal emulator.

       -s WxH width and height of terminal emulator separated by 'x'.

       -q query
	      query, if it is specified, X selection is not read.

ENVIRONMENT

       dict_lookup recognizes the following environment variables.  The default value is specified in square brackets.

       D_AWK_PROG
	      AWK interpreter to use.  [awk]

       D_XCLIP_PROG
	      xclip application.  [xclip]

       D_XTERM_PROG
	      xterm or equivalent terminal emulator.  [xterm]

       D_UTF8_LOCALE
	      UTF-8 locale.  [first available UTF-8 locale on system]

       D_DICT_PROG
	      Dictionary client program.  [dict]

       D_DICT_SERVER
	      Option for dictionary client specifying the server.  [-h dict.org]

       D_DICT_PORT
	      Option for dictionary client specifying the port.  [-p 2628]

       D_DICT_DB_OPT
	      Option for dictionary client specifying the database.  [-d foldoc]

       D_XTERM_CLASS
	      Option for terminal emulator specifying the class.  [-class XTerm]

       D_XTERM_NAME
	      Option for terminal emulator specifying the name.  [-name xterm_dict]

       D_XTERM_TITLE
	      Option for terminal emulator specifying the title.  [-title dict_lookup]

       D_TEXT_WIDTH
	      Program calculating text width for given text.  [cyrillic_text_width]
	      cyrillic_text_width doesn't work correctly for Japanese, Korean, Chinese and some other languages.

       D_TERM_X
	      Terminal emulator X coordinate.  [+200]

       D_TERM_Y
	      Terminal emulator Y coordinate.  [+200]

       D_TERM_H
	      Terminal emulator height.  [+40]

       D_PAGER
	      Pager.  [less -R]

SEE ALSO

       dict(1), less(1), xterm(1), dictd(8), http://www.dict.org, RFC 2229

								  9 January 2011						    DICT_LOOKUP(1)
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