kbhit() for Linux

/*
Well I would just use ncurses, but you could possibly use below? Chances are you problly don't need either unless you're making a crappy console game, or a password program.
*/

#include stdio.h>
#include termios.h>
#include unistd.h>
#include sys/types.h>
#include sys/time.h>

/* This id to hide the character we type and suspend any
prints after dir 1 , displayed ony when dir 0 */
void changemode ( int dir )
{
static struct termios oldt, newt;
if ( dir == 1 )
{
tcgetattr ( STDIN_FILENO, &oldt );
newt = oldt;
newt.c_lflag &= ~ ( ICANON | ECHO );
tcsetattr ( STDIN_FILENO, TCSANOW, &newt );
}
else
tcsetattr ( STDIN_FILENO, TCSANOW, &oldt );
}
int kbhit ( void )
{
struct timeval tv;
fd_set rdfs;

tv.tv_sec = 0;
tv.tv_usec = 0;

FD_ZERO ( &rdfs );
FD_SET ( STDIN_FILENO, &rdfs );
// select ( STDIN_FILENO + 1, &rdfs, NULL, NULL, &tv );
select ( STDIN_FILENO + 1, &rdfs, NULL, NULL, NULL );
printf(" After ");
return FD_ISSET ( STDIN_FILENO, &rdfs );

}

int main ( void )
{
int ch;
printf(" Press any Key to continue\n ");
changemode ( 1 );

while ( !kbhit() )
{
// putchar ( '.' );
}
ch = getchar();
printf ( "\nGot %c\n", ch );
changemode ( 0 );
return 0;
}