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From: deen@utopia.rutgers.edu (Cinnamon Raisin)
Newsgroups: comp.lang.c,comp.unix.questions
Subject: Catching ^C and ^Z
Message-ID: <Sep.4.20.08.17.1990.1216@utopia.rutgers.edu>
Date: 5 Sep 90 00:08:20 GMT
Followup-To: comp.lang.c
Organization: The Diamond Z
Lines: 52


Hi boys and girls,

	I am trying to write a quick programme to lock a terminal(TTY)
	when I leave it.  Essentially I want to capture all the 
	interrupts that can be sent from the keyboard, such as
	SIG_INT,SIG_QUIT and so on.  The only reasonable thing I've 
	found that lets me do this is ioctl().

	Essentially I need to get all the characters from the keyboard
	in the RAW mode, sos I can process them myself.  How can I do
	this.  The unix ref is a bit hazy on the topic and the mann page
	makes no mention of the RAW mode.

		I know I need to capture the current mode, 
		push my mode onto the system
		deal with the passwords and junk from keyboard
		and restore the captured mode.

	The following is a short programme I wrote to test this out, 
	but it dumps on me, and I don't know why.


------------

#include <stdio.h>
#include <sys/ioctl.h>
#include <sgtty.h>
char TMP;			/* to hold keyboard entry */
struct sgttyb *TTY;		/* From unix ref	  */

int main(void)
{
  ioctl(0,TIOCGETP,TTY);	/* Get current status	  */
  TTY->sg_flags = RAW | ECHO;   /* Unprocessed and echoed */
  ioctl(0,TIOCSETN,TTY);	/* to the screen	  */
  while(1 == 1) {TMP = getchar();} 
  exit(0);
}

------------

	Do I have the calling parameters typed wrongly or somethin?

					...Tanx in Advanz...

					-Z Raisin
-- 
---
"May The Prezent Tenz Be With You."
-The Super Amazin Cinnamon Raisin
 deen@police.rutgers.edu