From: Ron Fox <fox@...>
Date: 2008-10-14T20:25:09+09:00
Subject: Re: Unable to trap C-z, C-y, C-s and C-q

probbably best to set the terminal to raw mode if this is unix as I 
suspect. http://www.rubyquiz.com/quiz5.html
shows an example of this.  Search for the read_char method or just
for the string 'raw'.

Ron.
Nit Khair wrote:
> I need to trap ^Y, ^Z, ^S, ^Q etc in my app. Have googled a lot but
> unable to find anything.
> 
> Finally, I wrote a program and trapped all the signals.
> 
> 1. Both C-z and C-y are trapped by SIGTSTP, but there is no key in
> getch() that they seem to trigger. Regardless of whether I use "SIG_IGN"
> or print, my curses program aborts.
> 
> 
> 2. I am still not getting C-s and C-q. They are not caught by any
> signal.
> 
> My code inside a ncurses program is like this:
> 
> %w[ TSTP CONT ABRT HUP STOP PIPE IO IOT CHLD CLD ILL INFO QUIT SYS TRAP
> TTOU  URG USR1 USR2 ].each { | alrm |
>   #Signal.trap("SIG#{alrm}") { stdscr.mvprintw(17, 2, "%-40s" % "#{alrm}
> ");
> 
>  stdscr.refresh; }        Signal.trap("SIG#{alrm}") { "SIG_IGN" }
> 
> }
> 
> The commented line prints TSTP for both C-y and c-z and exits.
> The second exits.
> 
> Its not a terminal setting since I use Vim and alpine and they use these
> keys.


-- 
Ron Fox
NSCL
Michigan State University
East Lansing, MI 48824-1321