Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 551 insertions, 0 deletions

diff --git a/drivers/char/tty_ioctl.c b/drivers/char/tty_ioctl.c
new file mode 100644
index 000000000000..58597993954f
--- /dev/null
+++ b/drivers/char/tty_ioctl.c
@@ -0,0 +1,551 @@
+/*
+ *  linux/drivers/char/tty_ioctl.c
+ *
+ *  Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
+ *
+ * Modified by Fred N. van Kempen, 01/29/93, to add line disciplines
+ * which can be dynamically activated and de-activated by the line
+ * discipline handling modules (like SLIP).
+ */
+
+#include <linux/types.h>
+#include <linux/termios.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/tty.h>
+#include <linux/fcntl.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/bitops.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+#undef TTY_DEBUG_WAIT_UNTIL_SENT
+
+#undef	DEBUG
+
+/*
+ * Internal flag options for termios setting behavior
+ */
+#define TERMIOS_FLUSH	1
+#define TERMIOS_WAIT	2
+#define TERMIOS_TERMIO	4
+
+void tty_wait_until_sent(struct tty_struct * tty, long timeout)
+{
+	DECLARE_WAITQUEUE(wait, current);
+
+#ifdef TTY_DEBUG_WAIT_UNTIL_SENT
+	char buf[64];
+	
+	printk(KERN_DEBUG "%s wait until sent...\n", tty_name(tty, buf));
+#endif
+	if (!tty->driver->chars_in_buffer)
+		return;
+	add_wait_queue(&tty->write_wait, &wait);
+	if (!timeout)
+		timeout = MAX_SCHEDULE_TIMEOUT;
+	do {
+#ifdef TTY_DEBUG_WAIT_UNTIL_SENT
+		printk(KERN_DEBUG "waiting %s...(%d)\n", tty_name(tty, buf),
+		       tty->driver->chars_in_buffer(tty));
+#endif
+		set_current_state(TASK_INTERRUPTIBLE);
+		if (signal_pending(current))
+			goto stop_waiting;
+		if (!tty->driver->chars_in_buffer(tty))
+			break;
+		timeout = schedule_timeout(timeout);
+	} while (timeout);
+	if (tty->driver->wait_until_sent)
+		tty->driver->wait_until_sent(tty, timeout);
+stop_waiting:
+	set_current_state(TASK_RUNNING);
+	remove_wait_queue(&tty->write_wait, &wait);
+}
+
+EXPORT_SYMBOL(tty_wait_until_sent);
+
+static void unset_locked_termios(struct termios *termios,
+				 struct termios *old,
+				 struct termios *locked)
+{
+	int	i;
+	
+#define NOSET_MASK(x,y,z) (x = ((x) & ~(z)) | ((y) & (z)))
+
+	if (!locked) {
+		printk(KERN_WARNING "Warning?!? termios_locked is NULL.\n");
+		return;
+	}
+
+	NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag);
+	NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag);
+	NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag);
+	NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag);
+	termios->c_line = locked->c_line ? old->c_line : termios->c_line;
+	for (i=0; i < NCCS; i++)
+		termios->c_cc[i] = locked->c_cc[i] ?
+			old->c_cc[i] : termios->c_cc[i];
+}
+
+static void change_termios(struct tty_struct * tty, struct termios * new_termios)
+{
+	int canon_change;
+	struct termios old_termios = *tty->termios;
+	struct tty_ldisc *ld;
+	
+	/*
+	 *	Perform the actual termios internal changes under lock.
+	 */
+	 
+
+	/* FIXME: we need to decide on some locking/ordering semantics
+	   for the set_termios notification eventually */
+	down(&tty->termios_sem);
+
+	*tty->termios = *new_termios;
+	unset_locked_termios(tty->termios, &old_termios, tty->termios_locked);
+	canon_change = (old_termios.c_lflag ^ tty->termios->c_lflag) & ICANON;
+	if (canon_change) {
+		memset(&tty->read_flags, 0, sizeof tty->read_flags);
+		tty->canon_head = tty->read_tail;
+		tty->canon_data = 0;
+		tty->erasing = 0;
+	}
+	
+	
+	if (canon_change && !L_ICANON(tty) && tty->read_cnt)
+		/* Get characters left over from canonical mode. */
+		wake_up_interruptible(&tty->read_wait);
+
+	/* See if packet mode change of state. */
+
+	if (tty->link && tty->link->packet) {
+		int old_flow = ((old_termios.c_iflag & IXON) &&
+				(old_termios.c_cc[VSTOP] == '\023') &&
+				(old_termios.c_cc[VSTART] == '\021'));
+		int new_flow = (I_IXON(tty) &&
+				STOP_CHAR(tty) == '\023' &&
+				START_CHAR(tty) == '\021');
+		if (old_flow != new_flow) {
+			tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP);
+			if (new_flow)
+				tty->ctrl_status |= TIOCPKT_DOSTOP;
+			else
+				tty->ctrl_status |= TIOCPKT_NOSTOP;
+			wake_up_interruptible(&tty->link->read_wait);
+		}
+	}
+	   
+	if (tty->driver->set_termios)
+		(*tty->driver->set_termios)(tty, &old_termios);
+
+	ld = tty_ldisc_ref(tty);
+	if (ld != NULL) {
+		if (ld->set_termios)
+			(ld->set_termios)(tty, &old_termios);
+		tty_ldisc_deref(ld);
+	}
+	up(&tty->termios_sem);
+}
+
+static int set_termios(struct tty_struct * tty, void __user *arg, int opt)
+{
+	struct termios tmp_termios;
+	struct tty_ldisc *ld;
+	int retval = tty_check_change(tty);
+
+	if (retval)
+		return retval;
+
+	if (opt & TERMIOS_TERMIO) {
+		memcpy(&tmp_termios, tty->termios, sizeof(struct termios));
+		if (user_termio_to_kernel_termios(&tmp_termios,
+						(struct termio __user *)arg))
+			return -EFAULT;
+	} else {
+		if (user_termios_to_kernel_termios(&tmp_termios,
+						(struct termios __user *)arg))
+			return -EFAULT;
+	}
+
+	ld = tty_ldisc_ref(tty);
+	
+	if (ld != NULL) {
+		if ((opt & TERMIOS_FLUSH) && ld->flush_buffer)
+			ld->flush_buffer(tty);
+		tty_ldisc_deref(ld);
+	}
+	
+	if (opt & TERMIOS_WAIT) {
+		tty_wait_until_sent(tty, 0);
+		if (signal_pending(current))
+			return -EINTR;
+	}
+
+	change_termios(tty, &tmp_termios);
+	return 0;
+}
+
+static int get_termio(struct tty_struct * tty, struct termio __user * termio)
+{
+	if (kernel_termios_to_user_termio(termio, tty->termios))
+		return -EFAULT;
+	return 0;
+}
+
+static unsigned long inq_canon(struct tty_struct * tty)
+{
+	int nr, head, tail;
+
+	if (!tty->canon_data || !tty->read_buf)
+		return 0;
+	head = tty->canon_head;
+	tail = tty->read_tail;
+	nr = (head - tail) & (N_TTY_BUF_SIZE-1);
+	/* Skip EOF-chars.. */
+	while (head != tail) {
+		if (test_bit(tail, tty->read_flags) &&
+		    tty->read_buf[tail] == __DISABLED_CHAR)
+			nr--;
+		tail = (tail+1) & (N_TTY_BUF_SIZE-1);
+	}
+	return nr;
+}
+
+#ifdef TIOCGETP
+/*
+ * These are deprecated, but there is limited support..
+ *
+ * The "sg_flags" translation is a joke..
+ */
+static int get_sgflags(struct tty_struct * tty)
+{
+	int flags = 0;
+
+	if (!(tty->termios->c_lflag & ICANON)) {
+		if (tty->termios->c_lflag & ISIG)
+			flags |= 0x02;		/* cbreak */
+		else
+			flags |= 0x20;		/* raw */
+	}
+	if (tty->termios->c_lflag & ECHO)
+		flags |= 0x08;			/* echo */
+	if (tty->termios->c_oflag & OPOST)
+		if (tty->termios->c_oflag & ONLCR)
+			flags |= 0x10;		/* crmod */
+	return flags;
+}
+
+static int get_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb)
+{
+	struct sgttyb tmp;
+
+	down(&tty->termios_sem);
+	tmp.sg_ispeed = 0;
+	tmp.sg_ospeed = 0;
+	tmp.sg_erase = tty->termios->c_cc[VERASE];
+	tmp.sg_kill = tty->termios->c_cc[VKILL];
+	tmp.sg_flags = get_sgflags(tty);
+	up(&tty->termios_sem);
+	
+	return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0;
+}
+
+static void set_sgflags(struct termios * termios, int flags)
+{
+	termios->c_iflag = ICRNL | IXON;
+	termios->c_oflag = 0;
+	termios->c_lflag = ISIG | ICANON;
+	if (flags & 0x02) {	/* cbreak */
+		termios->c_iflag = 0;
+		termios->c_lflag &= ~ICANON;
+	}
+	if (flags & 0x08) {		/* echo */
+		termios->c_lflag |= ECHO | ECHOE | ECHOK |
+				    ECHOCTL | ECHOKE | IEXTEN;
+	}
+	if (flags & 0x10) {		/* crmod */
+		termios->c_oflag |= OPOST | ONLCR;
+	}
+	if (flags & 0x20) {	/* raw */
+		termios->c_iflag = 0;
+		termios->c_lflag &= ~(ISIG | ICANON);
+	}
+	if (!(termios->c_lflag & ICANON)) {
+		termios->c_cc[VMIN] = 1;
+		termios->c_cc[VTIME] = 0;
+	}
+}
+
+static int set_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb)
+{
+	int retval;
+	struct sgttyb tmp;
+	struct termios termios;
+
+	retval = tty_check_change(tty);
+	if (retval)
+		return retval;
+	
+	if (copy_from_user(&tmp, sgttyb, sizeof(tmp)))
+		return -EFAULT;
+
+	down(&tty->termios_sem);		
+	termios =  *tty->termios;
+	termios.c_cc[VERASE] = tmp.sg_erase;
+	termios.c_cc[VKILL] = tmp.sg_kill;
+	set_sgflags(&termios, tmp.sg_flags);
+	up(&tty->termios_sem);
+	change_termios(tty, &termios);
+	return 0;
+}
+#endif
+
+#ifdef TIOCGETC
+static int get_tchars(struct tty_struct * tty, struct tchars __user * tchars)
+{
+	struct tchars tmp;
+
+	tmp.t_intrc = tty->termios->c_cc[VINTR];
+	tmp.t_quitc = tty->termios->c_cc[VQUIT];
+	tmp.t_startc = tty->termios->c_cc[VSTART];
+	tmp.t_stopc = tty->termios->c_cc[VSTOP];
+	tmp.t_eofc = tty->termios->c_cc[VEOF];
+	tmp.t_brkc = tty->termios->c_cc[VEOL2];	/* what is brkc anyway? */
+	return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0;
+}
+
+static int set_tchars(struct tty_struct * tty, struct tchars __user * tchars)
+{
+	struct tchars tmp;
+
+	if (copy_from_user(&tmp, tchars, sizeof(tmp)))
+		return -EFAULT;
+	tty->termios->c_cc[VINTR] = tmp.t_intrc;
+	tty->termios->c_cc[VQUIT] = tmp.t_quitc;
+	tty->termios->c_cc[VSTART] = tmp.t_startc;
+	tty->termios->c_cc[VSTOP] = tmp.t_stopc;
+	tty->termios->c_cc[VEOF] = tmp.t_eofc;
+	tty->termios->c_cc[VEOL2] = tmp.t_brkc;	/* what is brkc anyway? */
+	return 0;
+}
+#endif
+
+#ifdef TIOCGLTC
+static int get_ltchars(struct tty_struct * tty, struct ltchars __user * ltchars)
+{
+	struct ltchars tmp;
+
+	tmp.t_suspc = tty->termios->c_cc[VSUSP];
+	tmp.t_dsuspc = tty->termios->c_cc[VSUSP];	/* what is dsuspc anyway? */
+	tmp.t_rprntc = tty->termios->c_cc[VREPRINT];
+	tmp.t_flushc = tty->termios->c_cc[VEOL2];	/* what is flushc anyway? */
+	tmp.t_werasc = tty->termios->c_cc[VWERASE];
+	tmp.t_lnextc = tty->termios->c_cc[VLNEXT];
+	return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0;
+}
+
+static int set_ltchars(struct tty_struct * tty, struct ltchars __user * ltchars)
+{
+	struct ltchars tmp;
+
+	if (copy_from_user(&tmp, ltchars, sizeof(tmp)))
+		return -EFAULT;
+
+	tty->termios->c_cc[VSUSP] = tmp.t_suspc;
+	tty->termios->c_cc[VEOL2] = tmp.t_dsuspc;	/* what is dsuspc anyway? */
+	tty->termios->c_cc[VREPRINT] = tmp.t_rprntc;
+	tty->termios->c_cc[VEOL2] = tmp.t_flushc;	/* what is flushc anyway? */
+	tty->termios->c_cc[VWERASE] = tmp.t_werasc;
+	tty->termios->c_cc[VLNEXT] = tmp.t_lnextc;
+	return 0;
+}
+#endif
+
+/*
+ * Send a high priority character to the tty.
+ */
+static void send_prio_char(struct tty_struct *tty, char ch)
+{
+	int	was_stopped = tty->stopped;
+
+	if (tty->driver->send_xchar) {
+		tty->driver->send_xchar(tty, ch);
+		return;
+	}
+	if (was_stopped)
+		start_tty(tty);
+	tty->driver->write(tty, &ch, 1);
+	if (was_stopped)
+		stop_tty(tty);
+}
+
+int n_tty_ioctl(struct tty_struct * tty, struct file * file,
+		       unsigned int cmd, unsigned long arg)
+{
+	struct tty_struct * real_tty;
+	void __user *p = (void __user *)arg;
+	int retval;
+	struct tty_ldisc *ld;
+
+	if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
+	    tty->driver->subtype == PTY_TYPE_MASTER)
+		real_tty = tty->link;
+	else
+		real_tty = tty;
+
+	switch (cmd) {
+#ifdef TIOCGETP
+		case TIOCGETP:
+			return get_sgttyb(real_tty, (struct sgttyb __user *) arg);
+		case TIOCSETP:
+		case TIOCSETN:
+			return set_sgttyb(real_tty, (struct sgttyb __user *) arg);
+#endif
+#ifdef TIOCGETC
+		case TIOCGETC:
+			return get_tchars(real_tty, p);
+		case TIOCSETC:
+			return set_tchars(real_tty, p);
+#endif
+#ifdef TIOCGLTC
+		case TIOCGLTC:
+			return get_ltchars(real_tty, p);
+		case TIOCSLTC:
+			return set_ltchars(real_tty, p);
+#endif
+		case TCGETS:
+			if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios))
+				return -EFAULT;
+			return 0;
+		case TCSETSF:
+			return set_termios(real_tty, p,  TERMIOS_FLUSH | TERMIOS_WAIT);
+		case TCSETSW:
+			return set_termios(real_tty, p, TERMIOS_WAIT);
+		case TCSETS:
+			return set_termios(real_tty, p, 0);
+		case TCGETA:
+			return get_termio(real_tty, p);
+		case TCSETAF:
+			return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_TERMIO);
+		case TCSETAW:
+			return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO);
+		case TCSETA:
+			return set_termios(real_tty, p, TERMIOS_TERMIO);
+		case TCXONC:
+			retval = tty_check_change(tty);
+			if (retval)
+				return retval;
+			switch (arg) {
+			case TCOOFF:
+				if (!tty->flow_stopped) {
+					tty->flow_stopped = 1;
+					stop_tty(tty);
+				}
+				break;
+			case TCOON:
+				if (tty->flow_stopped) {
+					tty->flow_stopped = 0;
+					start_tty(tty);
+				}
+				break;
+			case TCIOFF:
+				if (STOP_CHAR(tty) != __DISABLED_CHAR)
+					send_prio_char(tty, STOP_CHAR(tty));
+				break;
+			case TCION:
+				if (START_CHAR(tty) != __DISABLED_CHAR)
+					send_prio_char(tty, START_CHAR(tty));
+				break;
+			default:
+				return -EINVAL;
+			}
+			return 0;
+		case TCFLSH:
+			retval = tty_check_change(tty);
+			if (retval)
+				return retval;
+				
+			ld = tty_ldisc_ref(tty);
+			switch (arg) {
+			case TCIFLUSH:
+				if (ld->flush_buffer)
+					ld->flush_buffer(tty);
+				break;
+			case TCIOFLUSH:
+				if (ld->flush_buffer)
+					ld->flush_buffer(tty);
+				/* fall through */
+			case TCOFLUSH:
+				if (tty->driver->flush_buffer)
+					tty->driver->flush_buffer(tty);
+				break;
+			default:
+				tty_ldisc_deref(ld);
+				return -EINVAL;
+			}
+			tty_ldisc_deref(ld);
+			return 0;
+		case TIOCOUTQ:
+			return put_user(tty->driver->chars_in_buffer ?
+					tty->driver->chars_in_buffer(tty) : 0,
+					(int __user *) arg);
+		case TIOCINQ:
+			retval = tty->read_cnt;
+			if (L_ICANON(tty))
+				retval = inq_canon(tty);
+			return put_user(retval, (unsigned int __user *) arg);
+		case TIOCGLCKTRMIOS:
+			if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios_locked))
+				return -EFAULT;
+			return 0;
+
+		case TIOCSLCKTRMIOS:
+			if (!capable(CAP_SYS_ADMIN))
+				return -EPERM;
+			if (user_termios_to_kernel_termios(real_tty->termios_locked, (struct termios __user *) arg))
+				return -EFAULT;
+			return 0;
+
+		case TIOCPKT:
+		{
+			int pktmode;
+
+			if (tty->driver->type != TTY_DRIVER_TYPE_PTY ||
+			    tty->driver->subtype != PTY_TYPE_MASTER)
+				return -ENOTTY;
+			if (get_user(pktmode, (int __user *) arg))
+				return -EFAULT;
+			if (pktmode) {
+				if (!tty->packet) {
+					tty->packet = 1;
+					tty->link->ctrl_status = 0;
+				}
+			} else
+				tty->packet = 0;
+			return 0;
+		}
+		case TIOCGSOFTCAR:
+			return put_user(C_CLOCAL(tty) ? 1 : 0, (int __user *)arg);
+		case TIOCSSOFTCAR:
+			if (get_user(arg, (unsigned int __user *) arg))
+				return -EFAULT;
+			down(&tty->termios_sem);
+			tty->termios->c_cflag =
+				((tty->termios->c_cflag & ~CLOCAL) |
+				 (arg ? CLOCAL : 0));
+			up(&tty->termios_sem);
+			return 0;
+		default:
+			return -ENOIOCTLCMD;
+		}
+}
+
+EXPORT_SYMBOL(n_tty_ioctl);