struct tty_driver *p, *res = NULL;
int tty_line = 0;
int len;
- char *str;
+ char *str, *stp;
for (str = name; *str; str++)
if ((*str >= '0' && *str <= '9') || *str == ',')
list_for_each_entry(p, &tty_drivers, tty_drivers) {
if (strncmp(name, p->name, len) != 0)
continue;
- if (*str == ',')
- str++;
- if (*str == '\0')
- str = NULL;
+ stp = str;
+ if (*stp == ',')
+ stp++;
+ if (*stp == '\0')
+ stp = NULL;
if (tty_line >= 0 && tty_line <= p->num && p->ops &&
- p->ops->poll_init && !p->ops->poll_init(p, tty_line, str)) {
+ p->ops->poll_init && !p->ops->poll_init(p, tty_line, stp)) {
res = tty_driver_kref_get(p);
*line = tty_line;
break;
tty_ldisc_deref(ld);
}
}
- wake_up_interruptible(&tty->write_wait);
+ wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
}
EXPORT_SYMBOL_GPL(tty_wakeup);
/**
- * tty_ldisc_flush - flush line discipline queue
- * @tty: tty
- *
- * Flush the line discipline queue (if any) for this tty. If there
- * is no line discipline active this is a no-op.
- */
-
-void tty_ldisc_flush(struct tty_struct *tty)
-{
- struct tty_ldisc *ld = tty_ldisc_ref(tty);
- if (ld) {
- if (ld->ops->flush_buffer)
- ld->ops->flush_buffer(tty);
- tty_ldisc_deref(ld);
- }
- tty_buffer_flush(tty);
-}
-
-EXPORT_SYMBOL_GPL(tty_ldisc_flush);
-
-/**
- * tty_reset_termios - reset terminal state
- * @tty: tty to reset
- *
- * Restore a terminal to the driver default state
- */
-
-static void tty_reset_termios(struct tty_struct *tty)
-{
- mutex_lock(&tty->termios_mutex);
- *tty->termios = tty->driver->init_termios;
- tty->termios->c_ispeed = tty_termios_input_baud_rate(tty->termios);
- tty->termios->c_ospeed = tty_termios_baud_rate(tty->termios);
- mutex_unlock(&tty->termios_mutex);
-}
-
-/**
* do_tty_hangup - actual handler for hangup events
* @work: tty device
*
struct file *cons_filp = NULL;
struct file *filp, *f = NULL;
struct task_struct *p;
- struct tty_ldisc *ld;
int closecount = 0, n;
unsigned long flags;
int refs = 0;
filp->f_op = &hung_up_tty_fops;
}
file_list_unlock();
- /*
- * FIXME! What are the locking issues here? This may me overdoing
- * things... This question is especially important now that we've
- * removed the irqlock.
- */
- ld = tty_ldisc_ref(tty);
- if (ld != NULL) {
- /* We may have no line discipline at this point */
- if (ld->ops->flush_buffer)
- ld->ops->flush_buffer(tty);
- tty_driver_flush_buffer(tty);
- if ((test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags)) &&
- ld->ops->write_wakeup)
- ld->ops->write_wakeup(tty);
- if (ld->ops->hangup)
- ld->ops->hangup(tty);
- }
- /*
- * FIXME: Once we trust the LDISC code better we can wait here for
- * ldisc completion and fix the driver call race
- */
- wake_up_interruptible(&tty->write_wait);
- wake_up_interruptible(&tty->read_wait);
- /*
- * Shutdown the current line discipline, and reset it to
- * N_TTY.
- */
- if (tty->driver->flags & TTY_DRIVER_RESET_TERMIOS)
- tty_reset_termios(tty);
- /* Defer ldisc switch */
- /* tty_deferred_ldisc_switch(N_TTY);
- This should get done automatically when the port closes and
- tty_release is called */
+ tty_ldisc_hangup(tty);
read_lock(&tasklist_lock);
if (tty->session) {
read_unlock(&tasklist_lock);
spin_lock_irqsave(&tty->ctrl_lock, flags);
- tty->flags = 0;
+ clear_bit(TTY_THROTTLED, &tty->flags);
+ clear_bit(TTY_PUSH, &tty->flags);
+ clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
put_pid(tty->session);
put_pid(tty->pgrp);
tty->session = NULL;
tty->pgrp = NULL;
tty->ctrl_status = 0;
+ set_bit(TTY_HUPPED, &tty->flags);
spin_unlock_irqrestore(&tty->ctrl_lock, flags);
/* Account for the p->signal references we killed */
* can't yet guarantee all that.
*/
set_bit(TTY_HUPPED, &tty->flags);
- if (ld) {
- tty_ldisc_enable(tty);
- tty_ldisc_deref(ld);
- }
+ tty_ldisc_enable(tty);
unlock_kernel();
if (f)
fput(f);
if (tty->link && tty->link->packet) {
tty->ctrl_status &= ~TIOCPKT_START;
tty->ctrl_status |= TIOCPKT_STOP;
- wake_up_interruptible(&tty->link->read_wait);
+ wake_up_interruptible_poll(&tty->link->read_wait, POLLIN);
}
spin_unlock_irqrestore(&tty->ctrl_lock, flags);
if (tty->ops->stop)
if (tty->link && tty->link->packet) {
tty->ctrl_status &= ~TIOCPKT_STOP;
tty->ctrl_status |= TIOCPKT_START;
- wake_up_interruptible(&tty->link->read_wait);
+ wake_up_interruptible_poll(&tty->link->read_wait, POLLIN);
}
spin_unlock_irqrestore(&tty->ctrl_lock, flags);
if (tty->ops->start)
void tty_write_unlock(struct tty_struct *tty)
{
mutex_unlock(&tty->atomic_write_lock);
- wake_up_interruptible(&tty->write_wait);
+ wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
}
int tty_write_lock(struct tty_struct *tty, int ndelay)
* be held until the 'fast-open' is also done. Will change once we
* have refcounting in the driver and per driver locking
*/
-struct tty_struct *tty_driver_lookup_tty(struct tty_driver *driver,
+static struct tty_struct *tty_driver_lookup_tty(struct tty_driver *driver,
struct inode *inode, int idx)
{
struct tty_struct *tty;
tty->count++;
tty->driver = driver; /* N.B. why do this every time?? */
+ mutex_lock(&tty->ldisc_mutex);
WARN_ON(!test_bit(TTY_LDISC, &tty->flags));
+ mutex_unlock(&tty->ldisc_mutex);
return 0;
}
if (tty_closing) {
if (waitqueue_active(&tty->read_wait)) {
- wake_up(&tty->read_wait);
+ wake_up_poll(&tty->read_wait, POLLIN);
do_sleep++;
}
if (waitqueue_active(&tty->write_wait)) {
- wake_up(&tty->write_wait);
+ wake_up_poll(&tty->write_wait, POLLOUT);
do_sleep++;
}
}
if (o_tty_closing) {
if (waitqueue_active(&o_tty->read_wait)) {
- wake_up(&o_tty->read_wait);
+ wake_up_poll(&o_tty->read_wait, POLLIN);
do_sleep++;
}
if (waitqueue_active(&o_tty->write_wait)) {
- wake_up(&o_tty->write_wait);
+ wake_up_poll(&o_tty->write_wait, POLLOUT);
do_sleep++;
}
}
struct tty_driver *driver;
int index;
dev_t device = inode->i_rdev;
- unsigned short saved_flags = filp->f_flags;
+ unsigned saved_flags = filp->f_flags;
nonseekable_open(inode, filp);
/* check whether we're reopening an existing tty */
tty = tty_driver_lookup_tty(driver, inode, index);
- if (IS_ERR(tty))
+ if (IS_ERR(tty)) {
+ mutex_unlock(&tty_mutex);
return PTR_ERR(tty);
+ }
}
if (tty) {
/**
* tty_do_resize - resize event
* @tty: tty being resized
- * @real_tty: real tty (not the same as tty if using a pty/tty pair)
* @rows: rows (character)
* @cols: cols (character)
*
* peform a terminal resize correctly
*/
-int tty_do_resize(struct tty_struct *tty, struct tty_struct *real_tty,
- struct winsize *ws)
+int tty_do_resize(struct tty_struct *tty, struct winsize *ws)
{
- struct pid *pgrp, *rpgrp;
+ struct pid *pgrp;
unsigned long flags;
- /* For a PTY we need to lock the tty side */
- mutex_lock(&real_tty->termios_mutex);
- if (!memcmp(ws, &real_tty->winsize, sizeof(*ws)))
+ /* Lock the tty */
+ mutex_lock(&tty->termios_mutex);
+ if (!memcmp(ws, &tty->winsize, sizeof(*ws)))
goto done;
/* Get the PID values and reference them so we can
avoid holding the tty ctrl lock while sending signals */
spin_lock_irqsave(&tty->ctrl_lock, flags);
pgrp = get_pid(tty->pgrp);
- rpgrp = get_pid(real_tty->pgrp);
spin_unlock_irqrestore(&tty->ctrl_lock, flags);
if (pgrp)
kill_pgrp(pgrp, SIGWINCH, 1);
- if (rpgrp != pgrp && rpgrp)
- kill_pgrp(rpgrp, SIGWINCH, 1);
-
put_pid(pgrp);
- put_pid(rpgrp);
tty->winsize = *ws;
- real_tty->winsize = *ws;
done:
- mutex_unlock(&real_tty->termios_mutex);
+ mutex_unlock(&tty->termios_mutex);
return 0;
}
/**
* tiocswinsz - implement window size set ioctl
- * @tty; tty
+ * @tty; tty side of tty
* @arg: user buffer for result
*
* Copies the user idea of the window size to the kernel. Traditionally
* then calls into the default method.
*/
-static int tiocswinsz(struct tty_struct *tty, struct tty_struct *real_tty,
- struct winsize __user *arg)
+static int tiocswinsz(struct tty_struct *tty, struct winsize __user *arg)
{
struct winsize tmp_ws;
if (copy_from_user(&tmp_ws, arg, sizeof(*arg)))
return -EFAULT;
if (tty->ops->resize)
- return tty->ops->resize(tty, real_tty, &tmp_ws);
+ return tty->ops->resize(tty, &tmp_ws);
else
- return tty_do_resize(tty, real_tty, &tmp_ws);
+ return tty_do_resize(tty, &tmp_ws);
}
/**
* the generic functionality existed. This piece of history is preserved
* in the expected tty API of posix OS's.
*
- * Locking: none, the open fle handle ensures it won't go away.
+ * Locking: none, the open file handle ensures it won't go away.
*/
static int fionbio(struct file *file, int __user *p)
if (get_user(nonblock, p))
return -EFAULT;
- /* file->f_flags is still BKL protected in the fs layer - vomit */
- lock_kernel();
+ spin_lock(&file->f_lock);
if (nonblock)
file->f_flags |= O_NONBLOCK;
else
file->f_flags &= ~O_NONBLOCK;
- unlock_kernel();
+ spin_unlock(&file->f_lock);
return 0;
}
return tty->ops->tiocmset(tty, file, set, clear);
}
+struct tty_struct *tty_pair_get_tty(struct tty_struct *tty)
+{
+ if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
+ tty->driver->subtype == PTY_TYPE_MASTER)
+ tty = tty->link;
+ return tty;
+}
+EXPORT_SYMBOL(tty_pair_get_tty);
+
+struct tty_struct *tty_pair_get_pty(struct tty_struct *tty)
+{
+ if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
+ tty->driver->subtype == PTY_TYPE_MASTER)
+ return tty;
+ return tty->link;
+}
+EXPORT_SYMBOL(tty_pair_get_pty);
+
/*
* Split this up, as gcc can choke on it otherwise..
*/
if (tty_paranoia_check(tty, inode, "tty_ioctl"))
return -EINVAL;
- real_tty = tty;
- if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
- tty->driver->subtype == PTY_TYPE_MASTER)
- real_tty = tty->link;
-
+ real_tty = tty_pair_get_tty(tty);
/*
* Factor out some common prep work
case TIOCGWINSZ:
return tiocgwinsz(real_tty, p);
case TIOCSWINSZ:
- return tiocswinsz(tty, real_tty, p);
+ return tiocswinsz(real_tty, p);
case TIOCCONS:
return real_tty != tty ? -EINVAL : tioccons(file);
case FIONBIO:
case TIOCGSID:
return tiocgsid(tty, real_tty, p);
case TIOCGETD:
- return put_user(tty->ldisc.ops->num, (int __user *)p);
+ return put_user(tty->ldisc->ops->num, (int __user *)p);
case TIOCSETD:
return tiocsetd(tty, p);
/*
/* Kill the entire session */
do_each_pid_task(session, PIDTYPE_SID, p) {
printk(KERN_NOTICE "SAK: killed process %d"
- " (%s): task_session_nr(p)==tty->session\n",
+ " (%s): task_session(p)==tty->session\n",
task_pid_nr(p), p->comm);
send_sig(SIGKILL, p, 1);
} while_each_pid_task(session, PIDTYPE_SID, p);
do_each_thread(g, p) {
if (p->signal->tty == tty) {
printk(KERN_NOTICE "SAK: killed process %d"
- " (%s): task_session_nr(p)==tty->session\n",
+ " (%s): task_session(p)==tty->session\n",
task_pid_nr(p), p->comm);
send_sig(SIGKILL, p, 1);
continue;
tty->buf.head = tty->buf.tail = NULL;
tty_buffer_init(tty);
mutex_init(&tty->termios_mutex);
+ mutex_init(&tty->ldisc_mutex);
init_waitqueue_head(&tty->write_wait);
init_waitqueue_head(&tty->read_wait);
INIT_WORK(&tty->hangup_work, do_tty_hangup);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff