> } > > The problem is, I'm not sure if I can just read and > output bytes from a port. Any alternate way would be > appreciated! Sample code attached. Mainly based on the Linux Programmer's Guide. Runs as suid root. Depends on ncurses. Press q-i buttons for various tones.
// Simple harmonium - needs root's privilege to run .
#include<sys/ioctl.h>
#include<sys/kd.h>
#include<sys/types.h>
#include<fcntl.h>
#include<unistd.h>
#include<cerrno>
#include<cstdlib>
#include<curses.h>
#include<iostream>
void
main ( )
{
char ch ;
int freq, fd = open ("/dev/console", O_WRONLY);
initscr() ;
while( 1 ){
ch = getch() ;
switch( ch ){
case 'u' :
freq = 46 ;
break ;
case 'y' :
freq = 48 ;
break ;
case 't' :
freq = 53 ;
break ;
case 'r' :
freq = 59 ;
break ;
case 'e' :
freq = 65 ;
break ;
case 'w' :
freq = 70 ;
break ;
case 'q' :
freq = 80 ;
break ;
case 'i' :
freq = 90 ;
break ;
default:
freq = -1 ;
}
if( freq == -1 )break ;
freq *=10 ;
ioctl (fd, KIOCSOUND, freq );
usleep ( 200000 );
ioctl( fd, KIOCSOUND, 0 ) ;
}
close (fd);
endwin() ;
}
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