/*** $Id: kbd_tty.c,v 1.15 2003/09/04 03:38:26 weiym Exp $**** kbd_tty.c: /dev/tty TTY Keyboard Driver**** Copyright (C) 2003 Feynman Software.** Copyright (C) 2000 ~ 2002 Song Lixin and Wei Yongming.*//*** This program is free software; you can redistribute it and/or modify** it under the terms of the GNU General Public License as published by** the Free Software Foundation; either version 2 of the License, or** (at your option) any later version.**** This program is distributed in the hope that it will be useful,** but WITHOUT ANY WARRANTY; without even the implied warranty of** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the** GNU General Public License for more details.**** You should have received a copy of the GNU General Public License** along with this program; if not, write to the Free Software** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA*//*** TODO:*/#include <sys/types.h>#include <fcntl.h>#include <unistd.h>#include <errno.h>#include <termios.h>#include <fcntl.h>#include <sys/ioctl.h>#include <sys/stat.h>#include <linux/kd.h>#include "common.h"#include "misc.h"#include "ial.h"#include "gal.h"#include "native.h"static const char* tty_dev;static int  TTY_Open(void);static void TTY_Close(void);static void TTY_GetModifierInfo(int *modifiers);static int  TTY_Read(unsigned char *buf, int *modifiers);static void TTY_Suspend(void);static int  TTY_Resume(void);KBDDEVICE kbddev_tty = {	TTY_Open,	TTY_Close,	TTY_GetModifierInfo,	TTY_Read,	TTY_Suspend,	TTY_Resume};static int kbd_fd;		/* file descriptor for keyboard */static	struct termios	startup_termios;		/* original terminal modes */static	int	startup_kbdmode;struct termios	work_termios;	/* startup_termios terminal modes *//* * Open the keyboard. * This is real simple, we just use a special file handle * that allows blocking I/O, and put the terminal into * character mode. */static int TTY_Open (void){    if (geteuid() == 0) /* is a super user, try to open the active console */        tty_dev = "/dev/tty0";    else    /* not a super user, so try to open the control terminal */        tty_dev = "/dev/tty";	kbd_fd = open(tty_dev, O_RDONLY | O_NOCTTY);	if (kbd_fd < 0)		return -1;	if (tcgetattr(kbd_fd, &startup_termios) < 0)		goto err;	work_termios = startup_termios;	work_termios.c_lflag &= ~(ICANON | ECHO  | ISIG);	work_termios.c_iflag &= ~(ISTRIP | IGNCR | ICRNL | INLCR | IXOFF | IXON);	work_termios.c_iflag |= IGNBRK;	work_termios.c_cc[VMIN] = 0;	work_termios.c_cc[VTIME] = 0;	if(tcsetattr(kbd_fd, TCSAFLUSH, &work_termios) < 0)		goto err;	/* Put the keyboard into MEDIUMRAW mode.  Despite the name, this	 * is really "mostly raw", with the kernel just folding long	 * scancode sequences (e.g. E0 XX) onto single keycodes.	 */	ioctl (kbd_fd, KDGKBMODE, &startup_kbdmode);	if (ioctl(kbd_fd, KDSKBMODE, K_MEDIUMRAW) < 0) 		goto err;	return kbd_fd;err:	close(kbd_fd);	kbd_fd = 0;	return -1;}/* * Close the keyboard. * This resets the terminal modes. */static void TTY_Close(void){	ioctl(kbd_fd, KDSKBMODE, startup_kbdmode);	tcsetattr(kbd_fd, TCSANOW, &startup_termios);	close(kbd_fd);	kbd_fd = -1;}/* * Return the possible modifiers for the keyboard. */static  void TTY_GetModifierInfo(int *modifiers){	*modifiers = 0;			/* no modifiers available */}/* * This reads one keystroke from the keyboard, and the current state of * the mode keys (ALT, SHIFT, CTRL).  Returns -1 on error, 0 if no data * is ready, and 1 if data was read.  This is a non-blocking call. */static int TTY_Read(unsigned char *buf, int *modifiers){	int	cc;			/* characters read */	unsigned char buf1;	*modifiers = 0;			/* no modifiers yet */	cc = read(kbd_fd, &buf1, 1);	*buf = buf1;	if (cc > 0) {		return 1;	}	if ((cc < 0) && (errno != EINTR) && (errno != EAGAIN))		return -1;	return 0;}/* activate_keyboard: *  Put keyboard into the mode we want. */static void TTY_Suspend(void){	TTY_Close();}/* deactivate_keyboard: *  Restore the original keyboard settings. */static int TTY_Resume(void){	kbd_fd = open (tty_dev, O_NONBLOCK);	if (kbd_fd < 0)		return -1;	if(tcsetattr(kbd_fd, TCSANOW, &work_termios) < 0)		goto err;	/* Put the keyboard into MEDIUMRAW mode.  Despite the name, this	 * is really "mostly raw", with the kernel just folding long	 * scancode sequences (e.g. E0 XX) onto single keycodes.	 */	if (ioctl(kbd_fd, KDSKBMODE, K_MEDIUMRAW) < 0) 		goto err;	return kbd_fd;err:	close(kbd_fd);	kbd_fd = 0;	return -1;}