ssize_t redirected_tty_write(struct file *, const char __user *, size_t, loff_t *);
static unsigned int tty_poll(struct file *, poll_table *);
static int tty_open(struct inode *, struct file *);
-static int ptmx_open(struct inode *, struct file *);
static int tty_release(struct inode *, struct file *);
int tty_ioctl(struct inode * inode, struct file * file,
unsigned int cmd, unsigned long arg);
static ssize_t hung_up_tty_read(struct file * file, char __user * buf,
size_t count, loff_t *ppos)
{
+ /* Can't seek (pread) on ttys. */
+ if (ppos != &file->f_pos)
+ return -ESPIPE;
return 0;
}
static ssize_t hung_up_tty_write(struct file * file, const char __user * buf,
size_t count, loff_t *ppos)
{
+ /* Can't seek (pwrite) on ttys. */
+ if (ppos != &file->f_pos)
+ return -ESPIPE;
return -EIO;
}
.fasync = tty_fasync,
};
-#ifdef CONFIG_UNIX98_PTYS
-static struct file_operations ptmx_fops = {
- .llseek = no_llseek,
- .read = tty_read,
- .write = tty_write,
- .poll = tty_poll,
- .ioctl = tty_ioctl,
- .open = ptmx_open,
- .release = tty_release,
- .fasync = tty_fasync,
-};
-#endif
-
static struct file_operations console_fops = {
.llseek = no_llseek,
.read = tty_read,
struct tty_struct * tty;
struct inode *inode;
+ /* Can't seek (pread) on ttys. */
+ if (ppos != &file->f_pos)
+ return -ESPIPE;
+
tty = (struct tty_struct *)file->private_data;
inode = file->f_dentry->d_inode;
if (tty_paranoia_check(tty, inode, "tty_read"))
struct tty_struct * tty;
struct inode *inode = file->f_dentry->d_inode;
+ /* Can't seek (pwrite) on ttys. */
+ if (ppos != &file->f_pos)
+ return -ESPIPE;
+
tty = (struct tty_struct *)file->private_data;
if (tty_paranoia_check(tty, inode, "tty_write"))
return -EIO;
if (p) {
ssize_t res;
+ /* Can't seek (pwrite) on ttys. */
+ if (ppos != &file->f_pos)
+ return -ESPIPE;
res = vfs_write(p, buf, count, &p->f_pos);
fput(p);
return res;
{
struct tty_struct *tty, *o_tty;
int pty_master, tty_closing, o_tty_closing, do_sleep;
- int devpts_master, devpts;
+ int devpts_master;
int idx;
char buf[64];
idx = tty->index;
pty_master = (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
tty->driver->subtype == PTY_TYPE_MASTER);
- devpts = (tty->driver->flags & TTY_DRIVER_DEVPTS_MEM) != 0;
- devpts_master = pty_master && devpts;
+ devpts_master = pty_master && (tty->driver->flags & TTY_DRIVER_DEVPTS_MEM);
o_tty = tty->link;
#ifdef TTY_PARANOIA_CHECK
#ifdef CONFIG_UNIX98_PTYS
/* Make this pty number available for reallocation */
- if (devpts) {
+ if (devpts_master) {
down(&allocated_ptys_lock);
idr_remove(&allocated_ptys, idx);
up(&allocated_ptys_lock);
dev_t device = inode->i_rdev;
unsigned short saved_flags = filp->f_flags;
- nonseekable_open(inode, filp);
retry_open:
noctty = filp->f_flags & O_NOCTTY;
index = -1;
return -ENODEV;
}
- driver = get_tty_driver(device, &index);
- if (!driver)
- return -ENODEV;
+#ifdef CONFIG_UNIX98_PTYS
+ if (device == MKDEV(TTYAUX_MAJOR,2)) {
+ int idr_ret;
+
+ /* find a device that is not in use. */
+ down(&allocated_ptys_lock);
+ if (!idr_pre_get(&allocated_ptys, GFP_KERNEL)) {
+ up(&allocated_ptys_lock);
+ return -ENOMEM;
+ }
+ idr_ret = idr_get_new(&allocated_ptys, NULL, &index);
+ if (idr_ret < 0) {
+ up(&allocated_ptys_lock);
+ if (idr_ret == -EAGAIN)
+ return -ENOMEM;
+ return -EIO;
+ }
+ if (index >= pty_limit) {
+ idr_remove(&allocated_ptys, index);
+ up(&allocated_ptys_lock);
+ return -EIO;
+ }
+ up(&allocated_ptys_lock);
+
+ driver = ptm_driver;
+ retval = init_dev(driver, index, &tty);
+ if (retval) {
+ down(&allocated_ptys_lock);
+ idr_remove(&allocated_ptys, index);
+ up(&allocated_ptys_lock);
+ return retval;
+ }
+
+ set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
+ if (devpts_pty_new(tty->link))
+ retval = -ENOMEM;
+ } else
+#endif
+ {
+ driver = get_tty_driver(device, &index);
+ if (!driver)
+ return -ENODEV;
got_driver:
- retval = init_dev(driver, index, &tty);
- if (retval)
- return retval;
+ retval = init_dev(driver, index, &tty);
+ if (retval)
+ return retval;
+ }
filp->private_data = tty;
file_move(filp, &tty->tty_files);
printk(KERN_DEBUG "error %d in opening %s...", retval,
tty->name);
#endif
+
+#ifdef CONFIG_UNIX98_PTYS
+ if (index != -1) {
+ down(&allocated_ptys_lock);
+ idr_remove(&allocated_ptys, index);
+ up(&allocated_ptys_lock);
+ }
+#endif
+
release_dev(filp);
if (retval != -ERESTARTSYS)
return retval;
return 0;
}
-#ifdef CONFIG_UNIX98_PTYS
-static int ptmx_open(struct inode * inode, struct file * filp)
-{
- struct tty_struct *tty;
- int retval;
- int index;
- int idr_ret;
-
- nonseekable_open(inode, filp);
-
- /* find a device that is not in use. */
- down(&allocated_ptys_lock);
- if (!idr_pre_get(&allocated_ptys, GFP_KERNEL)) {
- up(&allocated_ptys_lock);
- return -ENOMEM;
- }
- idr_ret = idr_get_new(&allocated_ptys, NULL, &index);
- if (idr_ret < 0) {
- up(&allocated_ptys_lock);
- if (idr_ret == -EAGAIN)
- return -ENOMEM;
- return -EIO;
- }
- if (index >= pty_limit) {
- idr_remove(&allocated_ptys, index);
- up(&allocated_ptys_lock);
- return -EIO;
- }
- up(&allocated_ptys_lock);
-
- retval = init_dev(ptm_driver, index, &tty);
- if (retval)
- goto out;
-
- set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
- filp->private_data = tty;
- file_move(filp, &tty->tty_files);
-
- retval = -ENOMEM;
- if (devpts_pty_new(tty->link))
- goto out1;
-
- check_tty_count(tty, "tty_open");
- retval = ptm_driver->open(tty, filp);
- if (!retval)
- return 0;
-out1:
- release_dev(filp);
-out:
- down(&allocated_ptys_lock);
- idr_remove(&allocated_ptys, index);
- up(&allocated_ptys_lock);
- return retval;
-}
-#endif
-
static int tty_release(struct inode * inode, struct file * filp)
{
lock_kernel();
class_simple_device_add(tty_class, MKDEV(TTYAUX_MAJOR, 1), NULL, "console");
#ifdef CONFIG_UNIX98_PTYS
- cdev_init(&ptmx_cdev, &ptmx_fops);
+ cdev_init(&ptmx_cdev, &tty_fops);
if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) ||
register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0)
panic("Couldn't register /dev/ptmx driver\n");
git://git.onelab.eu / linux-2.6.git / blobdiff