#include <asm/uaccess.h>
#include <asm/system.h>
-#include <asm/bitops.h>
+#include <linux/bitops.h>
#include <linux/devpts_fs.h>
-#if defined(CONFIG_LEGACY_PTYS) || defined(CONFIG_UNIX98_PTYS)
-
-#ifdef CONFIG_LEGACY_PTYS
-static struct tty_driver *pty_driver, *pty_slave_driver;
-#endif
-
/* These are global because they are accessed in tty_io.c */
#ifdef CONFIG_UNIX98_PTYS
struct tty_driver *ptm_driver;
-struct tty_driver *pts_driver;
+static struct tty_driver *pts_driver;
#endif
static void pty_close(struct tty_struct * tty, struct file * filp)
if (!tty->link)
return;
tty->link->packet = 0;
+ set_bit(TTY_OTHER_CLOSED, &tty->link->flags);
wake_up_interruptible(&tty->link->read_wait);
wake_up_interruptible(&tty->link->write_wait);
- set_bit(TTY_OTHER_CLOSED, &tty->link->flags);
if (tty->driver->subtype == PTY_TYPE_MASTER) {
set_bit(TTY_OTHER_CLOSED, &tty->flags);
#ifdef CONFIG_UNIX98_PTYS
if (!o_tty)
return;
- if ((o_tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
- o_tty->ldisc.write_wakeup)
- (o_tty->ldisc.write_wakeup)(o_tty);
- wake_up_interruptible(&o_tty->write_wait);
+ tty_wakeup(o_tty);
set_bit(TTY_THROTTLED, &tty->flags);
}
* (2) avoid redundant copying for cases where count >> receive_room
* N.B. Calls from user space may now return an error code instead of
* a count.
+ *
+ * FIXME: Our pty_write method is called with our ldisc lock held but
+ * not our partners. We can't just take the other one blindly without
+ * risking deadlocks. There is also the small matter of TTY_DONT_FLIP
*/
-static int pty_write(struct tty_struct * tty, int from_user,
- const unsigned char *buf, int count)
+static int pty_write(struct tty_struct * tty, const unsigned char *buf, int count)
{
struct tty_struct *to = tty->link;
- int c=0, n, room;
- char *temp_buffer;
+ int c;
if (!to || tty->stopped)
return 0;
- if (from_user) {
- down(&tty->flip.pty_sem);
- temp_buffer = &tty->flip.char_buf[0];
- while (count > 0) {
- /* check space so we don't copy needlessly */
- n = to->ldisc.receive_room(to);
- if (n > count)
- n = count;
- if (!n) break;
-
- n = min(n, PTY_BUF_SIZE);
- n -= copy_from_user(temp_buffer, buf, n);
- if (!n) {
- if (!c)
- c = -EFAULT;
- break;
- }
-
- /* check again in case the buffer filled up */
- room = to->ldisc.receive_room(to);
- if (n > room)
- n = room;
- if (!n) break;
- buf += n;
- c += n;
- count -= n;
- to->ldisc.receive_buf(to, temp_buffer, 0, n);
- }
- up(&tty->flip.pty_sem);
- } else {
- c = to->ldisc.receive_room(to);
- if (c > count)
- c = count;
- to->ldisc.receive_buf(to, buf, 0, c);
- }
+ c = to->receive_room;
+ if (c > count)
+ c = count;
+ to->ldisc.receive_buf(to, buf, NULL, c);
return c;
}
if (!to || tty->stopped)
return 0;
- return to->ldisc.receive_room(to);
+ return to->receive_room;
}
/*
struct tty_struct *to = tty->link;
int count;
+ /* We should get the line discipline lock for "tty->link" */
if (!to || !to->ldisc.chars_in_buffer)
return 0;
return ((count < N_TTY_BUF_SIZE/2) ? 0 : count);
}
-/*
- * Return the device number of a Unix98 PTY (only!). This lets us open a
- * master pty with the multi-headed ptmx device, then find out which
- * one we got after it is open, with an ioctl.
- */
-#ifdef CONFIG_UNIX98_PTYS
-static int pty_get_device_number(struct tty_struct *tty, unsigned __user *value)
-{
- unsigned int result = tty->index;
- return put_user(result, value);
-}
-#endif
-
/* Set the lock flag on a pty */
static int pty_set_lock(struct tty_struct *tty, int __user * arg)
{
return 0;
}
-#ifdef CONFIG_LEGACY_PTYS
-static int pty_bsd_ioctl(struct tty_struct *tty, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- if (!tty) {
- printk("pty_ioctl called with NULL tty!\n");
- return -EIO;
- }
- switch(cmd) {
- case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
- return pty_set_lock(tty, (int __user *) arg);
- }
- return -ENOIOCTLCMD;
-}
-#endif
-
-#ifdef CONFIG_UNIX98_PTYS
-static int pty_unix98_ioctl(struct tty_struct *tty, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- if (!tty) {
- printk("pty_unix98_ioctl called with NULL tty!\n");
- return -EIO;
- }
- switch(cmd) {
- case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
- return pty_set_lock(tty, (int __user *)arg);
- case TIOCGPTN: /* Get PT Number */
- return pty_get_device_number(tty, (unsigned int __user *)arg);
- }
-
- return -ENOIOCTLCMD;
-}
-#endif
-
static void pty_flush_buffer(struct tty_struct *tty)
{
struct tty_struct *to = tty->link;
.set_termios = pty_set_termios,
};
-/* sysctl support for setting limits on the number of Unix98 ptys allocated.
- Otherwise one can eat up all kernel memory by opening /dev/ptmx repeatedly. */
-#ifdef CONFIG_UNIX98_PTYS
-int pty_limit = NR_UNIX98_PTY_DEFAULT;
-static int pty_limit_min = 0;
-static int pty_limit_max = NR_UNIX98_PTY_MAX;
+/* Traditional BSD devices */
+#ifdef CONFIG_LEGACY_PTYS
+static struct tty_driver *pty_driver, *pty_slave_driver;
-ctl_table pty_table[] = {
- {
- .ctl_name = PTY_MAX,
- .procname = "max",
- .maxlen = sizeof(int),
- .mode = 0644,
- .data = &pty_limit,
- .proc_handler = &proc_dointvec_minmax,
- .strategy = &sysctl_intvec,
- .extra1 = &pty_limit_min,
- .extra2 = &pty_limit_max,
- }, {
- .ctl_name = PTY_NR,
- .procname = "nr",
- .maxlen = sizeof(int),
- .mode = 0444,
- .proc_handler = &proc_dointvec,
- }, {
- .ctl_name = 0
+static int pty_bsd_ioctl(struct tty_struct *tty, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
+ return pty_set_lock(tty, (int __user *) arg);
}
-};
-#endif
-
-/* Initialization */
+ return -ENOIOCTLCMD;
+}
-static int __init pty_init(void)
+static void __init legacy_pty_init(void)
{
-#ifdef CONFIG_LEGACY_PTYS
- /* Traditional BSD devices */
pty_driver = alloc_tty_driver(NR_PTYS);
if (!pty_driver)
panic("Couldn't register pty driver");
if (tty_register_driver(pty_slave_driver))
panic("Couldn't register pty slave driver");
+}
+#else
+static inline void legacy_pty_init(void) { }
+#endif
-#endif /* CONFIG_LEGACY_PTYS */
-
+/* Unix98 devices */
#ifdef CONFIG_UNIX98_PTYS
- /* Unix98 devices */
+/*
+ * sysctl support for setting limits on the number of Unix98 ptys allocated.
+ * Otherwise one can eat up all kernel memory by opening /dev/ptmx repeatedly.
+ */
+int pty_limit = NR_UNIX98_PTY_DEFAULT;
+static int pty_limit_min = 0;
+static int pty_limit_max = NR_UNIX98_PTY_MAX;
+
+ctl_table pty_table[] = {
+ {
+ .ctl_name = PTY_MAX,
+ .procname = "max",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .data = &pty_limit,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &pty_limit_min,
+ .extra2 = &pty_limit_max,
+ }, {
+ .ctl_name = PTY_NR,
+ .procname = "nr",
+ .maxlen = sizeof(int),
+ .mode = 0444,
+ .proc_handler = &proc_dointvec,
+ }, {
+ .ctl_name = 0
+ }
+};
+
+static int pty_unix98_ioctl(struct tty_struct *tty, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
+ return pty_set_lock(tty, (int __user *)arg);
+ case TIOCGPTN: /* Get PT Number */
+ return put_user(tty->index, (unsigned int __user *)arg);
+ }
+
+ return -ENOIOCTLCMD;
+}
+
+static void __init unix98_pty_init(void)
+{
devfs_mk_dir("pts");
ptm_driver = alloc_tty_driver(NR_UNIX98_PTY_MAX);
if (!ptm_driver)
panic("Couldn't register Unix98 pts driver");
pty_table[1].data = &ptm_driver->refcount;
-#endif /* CONFIG_UNIX98_PTYS */
+}
+#else
+static inline void unix98_pty_init(void) { }
+#endif
+static int __init pty_init(void)
+{
+ legacy_pty_init();
+ unix98_pty_init();
return 0;
}
module_init(pty_init);
-
-#endif /* CONFIG_LEGACY_PTYS || CONFIG_UNIX98_PTYS */
git://git.onelab.eu / linux-2.6.git / blobdiff