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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 SUNOS

tty

tty(1)								   User Commands							    tty(1)

NAME

       tty - return user's terminal name

SYNOPSIS

       tty [-l] [-s]

DESCRIPTION

       The  tty utility writes to the standard output the name of the terminal that is open as standard input. The name that is used is equivalent
       to the string that would be returned by the ttyname(3C) function.

OPTIONS

       The following options are supported:

       -l	Prints the synchronous line number to which the user's terminal is connected, if it is on an active synchronous line.

       -s	Inhibits printing of the terminal path name, allowing one to test just the exit status.

ENVIRONMENT VARIABLES

       See environ(5) for descriptions of the following environment variables that affect the execution of  tty: LANG, LC_ALL, LC_CTYPE,   LC_MES-
       SAGES,  and NLSPATH.

EXIT STATUS

       The following exit values are returned:

       0	Standard input is a terminal.

       1	Standard input is not a terminal.

       >1	An error occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |enabled			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       isatty(3C), ttyname(3C), attributes(5), environ(5), standards(5)

DIAGNOSTICS

       not on an active synchronous line

	   The standard input is not a synchronous terminal and -l is specified.

       not a tty

	   The standard input is not a terminal and -s is not specified.

NOTES

       The -s option is useful only if the exit status is wanted. It does not rely on the ability to form a valid path name. Portable applications
       should use test -t.

SunOS 5.10							    1 Feb 1995								    tty(1)
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