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Top Forums Programming Terminal emulator from scratch. Post 302452915 by Corona688 on Monday 13th of September 2010 11:28:41 AM
Old 09-13-2010
Quote:
Originally Posted by howdini
I have tried to wrap my mind around this particular statement. Does this mean that no terminal based programs can be run successfully from a GUI based application without some special work on the calling command e.g 'system()', or does 'system()' handle this trickery for us. Please enlighten me.
It's not a question of GUI vs non-GUI. The difference between a "window mode" application and a "console mode" application is that the "window mode" application has extra code to talk to an X11 server. It doesn't lack anything a "console" app has.

The dilemma is terminal vs non-terminal. Commands can tell whether their stdin/stdout/stderr is attached to a terminal device or not via the isatty() system call. Nothing but a real or virtual terminal will qualify.

system() doesn't help you arrange a terminal. system() can't even capture the command's output.
 

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console(7D)							      Devices							       console(7D)

NAME
console - STREAMS-based console interface SYNOPSIS
/dev/console DESCRIPTION
The file /dev/console refers to the system console device. /dev/console should be used for interactive purposes only. Use of /dev/console for logging purposes is discouraged; syslog(3C) or msglog(7D) should be used instead. The identity of this device depends on the EEPROM or NVRAM settings in effect at the most recent system reboot; by default, it is the ``workstation console'' device consisting of the workstation keyboard and frame buffer acting in concert to emulate an ASCII terminal (see wscons(7D)). Regardless of the system configuration, the console device provides asynchronous serial driver semantics so that, in conjunction with the STREAMS line discipline module ldterm(7M), it supports the termio(7I) terminal interface. SEE ALSO
syslog(3C), termios(3C), ldterm(7M), termio(7I), msglog(7D), wscons(7D) NOTES
In contrast to pre-SunOS 5.0 releases, it is no longer possible to redirect I/O intended for /dev/console to some other device. Instead, redirection now applies to the workstation console device using a revised programming interface (see wscons(7D)). Since the system console is normally configured to be the work station console, the overall effect is largely unchanged from previous releases. See wscons(7D) for detailed descriptions of control sequence syntax, ANSI control functions, control character functions and escape sequence functions. SunOS 5.11 23 Apr 1999 console(7D)
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