Some questions about linux termios

["pei lin" <telent998@gmail.com>]

Hi,buddy
   I am puzzled by the linux termios.
    First Question about /dev/tty0 and /dev/tty,this two devices is
the same one?
    When i am in X terminal,as /dev/pts/0 , i do "echo hello >
/dev/pts/0 and echo hello > /dev/tty ", they return the same like that
"hello" on the screen .This means /dev/tty ->/dev/pts/0? But "echo
hello > /dev/tty0",there is nothing on the screen.And when i go to
Init 3 mode ,like /dev/tty1,when i do "echo hello > /dev/tty1 and echo
hello > .dev/tty and echo hello > /dev/tty0" ,They return the same all
print hello on the screen.Do they all point to the /dev/tty1?

    The second Question is that i write a small program to get
keyboard input like below.When i run it in X terminal ,when i press
keyboard it can return but can not get the press and release event.And
in the console,like tty1,it doesn't work .i don't know why.

file : get_keyboard.c

#include <stdio.h>
#include <linux/keyboard.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <linux/kd.h>
#include <termios.h>
#include <unistd.h>
int main()
{
	int fd,len,i;
	struct kbentry entry;
	unsigned char buf[64];
	struct termios  ts,old_ts;	
	char * path;
	path = ttyname(0);
	printf("%s!\n",path);
	fd = open(path, O_RDONLY|O_NOCTTY);
	if(fd < 0){
		printf("open the device error!\n");
	}
	
	printf("fd --- %d!\n",fd);
	
	if (ioctl( fd, KDSKBMODE, K_RAW ) < 0) {
			printf("set mode wrong!\n");
	}
	

	tcgetattr( fd, &old_ts );
	

	   ts = old_ts;
     ts.c_cc[VTIME] = 0;
     ts.c_cc[VMIN] = 1;
     ts.c_lflag &= ~(ICANON|ECHO|ISIG);
     ts.c_iflag = 0;
     tcsetattr( fd, TCSAFLUSH, &ts );

     tcsetpgrp( fd, getpgrp() );


	   entry.kb_table = K_NORMTAB;
     entry.kb_value = 0;
	
	while(1){
		len=read(fd,buf,64);
  	printf("len ========= %d!\n",len);
		for(i =0; i < len;i++){
			entry.kb_index = buf[i];
			if(ioctl(fd,KDGKBENT,&entry)){
			printf("struct entry :%d %d
%d\n",entry.kb_table,entry.kb_index,entry.kb_value);
			if('2' == entry.kb_index){
				tcsetattr( fd, TCSAFLUSH, &old_ts );
				exit(0);
			   }
			}
                                      }
		}
}