Lines Matching +full:num +full:- +full:ss +full:- +full:bits
1 // SPDX-License-Identifier: GPL-2.0
8 * or rs-channels. It also implements echoing, cooked mode etc.
10 * Kill-line thanks to John T Kohl, who also corrected VMIN = VTIME = 0.
19 * between the high-level tty routines (tty_io.c and tty_ioctl.c) and
20 * the low-level tty routines (serial.c, pty.c, console.c). This
21 * makes for cleaner and more compact code. -TYT, 9/17/92
24 * which can be dynamically activated and de-activated by the line
29 * -- TYT, 1/31/92
32 * other bits should be there.
33 * -- Nick Holloway <[email protected]>, 27th May 1993.
36 * -- [email protected] (J. Cowley), 13Jan94
39 * -- [email protected], 9Sep95
42 * -- [email protected], 19-Nov-95
45 * -- [email protected], 5-Dec-95
49 * -- Marko Kohtala <[email protected]>, March 97
52 * -- Bill Hawes <[email protected]>, June 97
55 * -- C. Scott Ananian <[email protected]>, 13-Jan-1998
57 * Added support for a Unix98-style ptmx device.
58 * -- C. Scott Ananian <[email protected]>, 14-Jan-1998
61 * -- Russell King <[email protected]>
65 * -- Andrew Morton <[email protected]> 17Mar01
90 #include <linux/ppp-ioctl.h>
137 /* This list gets poked at by procfs and various bits of boot up code. This
162 * free_tty_struct - free a disused tty
172 put_device(tty->dev); in free_tty_struct()
173 kvfree(tty->write_buf); in free_tty_struct()
179 return ((struct tty_file_private *)file->private_data)->tty; in file_tty()
188 return -ENOMEM; in tty_alloc_file()
190 file->private_data = priv; in tty_alloc_file()
198 struct tty_file_private *priv = file->private_data; in tty_add_file()
200 priv->tty = tty; in tty_add_file()
201 priv->file = file; in tty_add_file()
203 spin_lock(&tty->files_lock); in tty_add_file()
204 list_add(&priv->list, &tty->tty_files); in tty_add_file()
205 spin_unlock(&tty->files_lock); in tty_add_file()
209 * tty_free_file - free file->private_data
217 struct tty_file_private *priv = file->private_data; in tty_free_file()
219 file->private_data = NULL; in tty_free_file()
226 struct tty_file_private *priv = file->private_data; in tty_del_file()
227 struct tty_struct *tty = priv->tty; in tty_del_file()
229 spin_lock(&tty->files_lock); in tty_del_file()
230 list_del(&priv->list); in tty_del_file()
231 spin_unlock(&tty->files_lock); in tty_del_file()
236 * tty_name - return tty naming
248 return tty->name; in tty_name()
254 if (!tty || !tty->driver) in tty_driver_name()
256 return tty->driver->name; in tty_driver_name()
279 spin_lock(&tty->files_lock); in check_tty_count()
280 list_for_each(p, &tty->tty_files) { in check_tty_count()
283 spin_unlock(&tty->files_lock); in check_tty_count()
284 if (tty->driver->type == TTY_DRIVER_TYPE_PTY && in check_tty_count()
285 tty->driver->subtype == PTY_TYPE_SLAVE && in check_tty_count()
286 tty->link && tty->link->count) in check_tty_count()
288 if (tty_port_kopened(tty->port)) in check_tty_count()
290 if (tty->count != (count + kopen_count)) { in check_tty_count()
291 tty_warn(tty, "%s: tty->count(%d) != (#fd's(%d) + #kopen's(%d))\n", in check_tty_count()
292 routine, tty->count, count, kopen_count); in check_tty_count()
298 * get_tty_driver - find device of a tty
312 dev_t base = MKDEV(p->major, p->minor_start); in get_tty_driver()
314 if (device < base || device >= base + p->num) in get_tty_driver()
316 *index = device - base; in get_tty_driver()
323 * tty_dev_name_to_number - return dev_t for device name
329 * function returns -%ENODEV.
346 return -EINVAL; in tty_dev_name_to_number()
352 prefix_length = str - name; in tty_dev_name_to_number()
357 if (prefix_length == strlen(p->name) && strncmp(name, in tty_dev_name_to_number()
358 p->name, prefix_length) == 0) { in tty_dev_name_to_number()
359 if (index < p->num) { in tty_dev_name_to_number()
360 *number = MKDEV(p->major, p->minor_start + index); in tty_dev_name_to_number()
365 return -ENODEV; in tty_dev_name_to_number()
372 * tty_find_polling_driver - find device of a polled tty
392 len = str - name; in tty_find_polling_driver()
398 if (!len || strncmp(name, p->name, len) != 0) in tty_find_polling_driver()
406 if (tty_line >= 0 && tty_line < p->num && p->ops && in tty_find_polling_driver()
407 p->ops->poll_init && !p->ops->poll_init(p, tty_line, stp)) { in tty_find_polling_driver()
427 return -EIO; in hung_up_tty_write()
430 /* No kernel lock held - none needed ;) */
439 return cmd == TIOCSPGRP ? -ENOTTY : -EIO; in hung_up_tty_ioctl()
445 return cmd == TIOCSPGRP ? -ENOTTY : -EIO; in hung_up_tty_compat_ioctl()
450 return -ENOTTY; in hung_up_tty_fasync()
457 if (tty && tty->ops && tty->ops->show_fdinfo) in tty_show_fdinfo()
458 tty->ops->show_fdinfo(tty, m); in tty_show_fdinfo()
502 * tty_wakeup - request more data
513 if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags)) { in tty_wakeup()
516 if (ld->ops->write_wakeup) in tty_wakeup()
517 ld->ops->write_wakeup(tty); in tty_wakeup()
521 wake_up_interruptible_poll(&tty->write_wait, EPOLLOUT); in tty_wakeup()
526 * tty_release_redirect - Release a redirect on a pty if present
547 * __tty_hangup - actual handler for hangup events
549 * @exit_session: if non-zero, signal all foreground group processes
568 * * ->siglock to protect ->signal/->sighand
586 if (test_bit(TTY_HUPPED, &tty->flags)) { in __tty_hangup()
597 set_bit(TTY_HUPPING, &tty->flags); in __tty_hangup()
605 spin_lock(&tty->files_lock); in __tty_hangup()
607 list_for_each_entry(priv, &tty->tty_files, list) { in __tty_hangup()
608 filp = priv->file; in __tty_hangup()
609 if (filp->f_op->write_iter == redirected_tty_write) in __tty_hangup()
611 if (filp->f_op->write_iter != tty_write) in __tty_hangup()
614 __tty_fasync(-1, filp, 0); /* can't block */ in __tty_hangup()
615 filp->f_op = &hung_up_tty_fops; in __tty_hangup()
617 spin_unlock(&tty->files_lock); in __tty_hangup()
620 /* Account for the p->signal references we killed */ in __tty_hangup()
621 while (refs--) in __tty_hangup()
626 spin_lock_irq(&tty->ctrl.lock); in __tty_hangup()
627 clear_bit(TTY_THROTTLED, &tty->flags); in __tty_hangup()
628 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); in __tty_hangup()
629 put_pid(tty->ctrl.session); in __tty_hangup()
630 put_pid(tty->ctrl.pgrp); in __tty_hangup()
631 tty->ctrl.session = NULL; in __tty_hangup()
632 tty->ctrl.pgrp = NULL; in __tty_hangup()
633 tty->ctrl.pktstatus = 0; in __tty_hangup()
634 spin_unlock_irq(&tty->ctrl.lock); in __tty_hangup()
639 * tty->count and state->count to go out of sync. in __tty_hangup()
643 if (tty->ops->close) in __tty_hangup()
645 tty->ops->close(tty, cons_filp); in __tty_hangup()
646 } else if (tty->ops->hangup) in __tty_hangup()
647 tty->ops->hangup(tty); in __tty_hangup()
650 * we did here. The driver layer expects no calls after ->hangup() in __tty_hangup()
653 set_bit(TTY_HUPPED, &tty->flags); in __tty_hangup()
654 clear_bit(TTY_HUPPING, &tty->flags); in __tty_hangup()
670 * tty_hangup - trigger a hangup event
679 schedule_work(&tty->hangup_work); in tty_hangup()
684 * tty_vhangup - process vhangup
700 * tty_vhangup_self - process vhangup for own ctty
716 * tty_vhangup_session - hangup session leader exit
732 * tty_hung_up_p - was tty hung up
739 return (filp && filp->f_op == &hung_up_tty_fops); in tty_hung_up_p()
745 if (tty->flow.stopped) in __stop_tty()
747 tty->flow.stopped = true; in __stop_tty()
748 if (tty->ops->stop) in __stop_tty()
749 tty->ops->stop(tty); in __stop_tty()
753 * stop_tty - propagate flow control
757 * device and will not re-call the &tty_driver->stop() method.
770 spin_lock_irqsave(&tty->flow.lock, flags); in stop_tty()
772 spin_unlock_irqrestore(&tty->flow.lock, flags); in stop_tty()
778 if (!tty->flow.stopped || tty->flow.tco_stopped) in __start_tty()
780 tty->flow.stopped = false; in __start_tty()
781 if (tty->ops->start) in __start_tty()
782 tty->ops->start(tty); in __start_tty()
787 * start_tty - propagate flow control
791 * stopped and is now being started, the &tty_driver->start() method is invoked
801 spin_lock_irqsave(&tty->flow.lock, flags); in start_tty()
803 spin_unlock_irqrestore(&tty->flow.lock, flags); in start_tty()
812 spin_lock(&tty->files_lock); in tty_update_time()
813 list_for_each_entry(priv, &tty->tty_files, list) { in tty_update_time()
814 struct inode *inode = file_inode(priv->file); in tty_update_time()
819 * lower three bits (i.e every 8 seconds). If so, then we can update in tty_update_time()
830 spin_unlock(&tty->files_lock); in tty_update_time()
834 * Iterate on the ldisc ->read() function until we've gotten all
856 size = ld->ops->read(tty, file, kernel_buf, size, &cookie, offset); in iterate_tty_read()
861 /* Did we have an earlier error (ie -EFAULT)? */ in iterate_tty_read()
867 * -EOVERFLOW means we didn't have enough space in iterate_tty_read()
871 if (retval == -EOVERFLOW) in iterate_tty_read()
878 count -= copied; in iterate_tty_read()
881 * If the user copy failed, we still need to do another ->read() in iterate_tty_read()
888 retval = -EFAULT; in iterate_tty_read()
899 * tty_read - read method for tty device files
912 struct file *file = iocb->ki_filp; in tty_read()
919 return -EIO; in tty_read()
921 return -EIO; in tty_read()
929 ret = -EIO; in tty_read()
930 if (ld->ops->read) in tty_read()
942 mutex_unlock(&tty->atomic_write_lock); in tty_write_unlock()
943 wake_up_interruptible_poll(&tty->write_wait, EPOLLOUT); in tty_write_unlock()
948 if (!mutex_trylock(&tty->atomic_write_lock)) { in tty_write_lock()
950 return -EAGAIN; in tty_write_lock()
951 if (mutex_lock_interruptible(&tty->atomic_write_lock)) in tty_write_lock()
952 return -ERESTARTSYS; in tty_write_lock()
959 * denial-of-service type attacks
967 ret = tty_write_lock(tty, file->f_flags & O_NDELAY); in iterate_tty_write()
973 * simplifies low-level drivers immensely, since they in iterate_tty_write()
977 * big chunk-size.. in iterate_tty_write()
979 * The default chunk-size is 2kB, because the NTTY in iterate_tty_write()
985 if (test_bit(TTY_NO_WRITE_SPLIT, &tty->flags)) in iterate_tty_write()
991 if (tty->write_cnt < chunk) { in iterate_tty_write()
999 ret = -ENOMEM; in iterate_tty_write()
1002 kvfree(tty->write_buf); in iterate_tty_write()
1003 tty->write_cnt = chunk; in iterate_tty_write()
1004 tty->write_buf = buf_chunk; in iterate_tty_write()
1011 ret = -EFAULT; in iterate_tty_write()
1012 if (copy_from_iter(tty->write_buf, size, from) != size) in iterate_tty_write()
1015 ret = ld->ops->write(tty, file, tty->write_buf, size); in iterate_tty_write()
1025 iov_iter_revert(from, size-ret); in iterate_tty_write()
1027 count -= ret; in iterate_tty_write()
1030 ret = -ERESTARTSYS; in iterate_tty_write()
1046 * tty_write_message - write a message to a certain tty, not just the console.
1061 mutex_lock(&tty->atomic_write_lock); in tty_write_message()
1063 if (tty->ops->write && tty->count > 0) in tty_write_message()
1064 tty->ops->write(tty, msg, strlen(msg)); in tty_write_message()
1078 return -EIO; in file_tty_write()
1079 if (!tty || !tty->ops->write || tty_io_error(tty)) in file_tty_write()
1080 return -EIO; in file_tty_write()
1082 if (tty->ops->write_room == NULL) in file_tty_write()
1087 if (!ld->ops->write) in file_tty_write()
1088 ret = -EIO; in file_tty_write()
1096 * tty_write - write method for tty device file
1111 return file_tty_write(iocb->ki_filp, iocb, from); in tty_write()
1138 * tty_send_xchar - send priority character
1148 bool was_stopped = tty->flow.stopped; in tty_send_xchar()
1150 if (tty->ops->send_xchar) { in tty_send_xchar()
1151 down_read(&tty->termios_rwsem); in tty_send_xchar()
1152 tty->ops->send_xchar(tty, ch); in tty_send_xchar()
1153 up_read(&tty->termios_rwsem); in tty_send_xchar()
1158 return -ERESTARTSYS; in tty_send_xchar()
1160 down_read(&tty->termios_rwsem); in tty_send_xchar()
1163 tty->ops->write(tty, &ch, 1); in tty_send_xchar()
1166 up_read(&tty->termios_rwsem); in tty_send_xchar()
1172 * pty_line_name - generate name for a pty
1185 int i = index + driver->name_base; in pty_line_name()
1186 /* ->name is initialized to "ttyp", but "tty" is expected */ in pty_line_name()
1188 driver->subtype == PTY_TYPE_SLAVE ? "tty" : driver->name, in pty_line_name()
1193 * tty_line_name - generate name for a tty
1205 if (driver->flags & TTY_DRIVER_UNNUMBERED_NODE) in tty_line_name()
1206 return sprintf(p, "%s", driver->name); in tty_line_name()
1208 return sprintf(p, "%s%d", driver->name, in tty_line_name()
1209 index + driver->name_base); in tty_line_name()
1213 * tty_driver_lookup_tty() - find an existing tty, if any
1228 if (driver->ops->lookup) { in tty_driver_lookup_tty()
1230 tty = ERR_PTR(-EIO); in tty_driver_lookup_tty()
1232 tty = driver->ops->lookup(driver, file, idx); in tty_driver_lookup_tty()
1234 if (idx >= driver->num) in tty_driver_lookup_tty()
1235 return ERR_PTR(-EINVAL); in tty_driver_lookup_tty()
1236 tty = driver->ttys[idx]; in tty_driver_lookup_tty()
1244 * tty_init_termios - helper for termios setup
1253 int idx = tty->index; in tty_init_termios()
1255 if (tty->driver->flags & TTY_DRIVER_RESET_TERMIOS) in tty_init_termios()
1256 tty->termios = tty->driver->init_termios; in tty_init_termios()
1259 tp = tty->driver->termios[idx]; in tty_init_termios()
1261 tty->termios = *tp; in tty_init_termios()
1262 tty->termios.c_line = tty->driver->init_termios.c_line; in tty_init_termios()
1264 tty->termios = tty->driver->init_termios; in tty_init_termios()
1267 tty->termios.c_ispeed = tty_termios_input_baud_rate(&tty->termios); in tty_init_termios()
1268 tty->termios.c_ospeed = tty_termios_baud_rate(&tty->termios); in tty_init_termios()
1273 * tty_standard_install - usual tty->ops->install
1277 * If the @driver overrides @tty->ops->install, it still can call this function
1284 tty->count++; in tty_standard_install()
1285 driver->ttys[tty->index] = tty; in tty_standard_install()
1291 * tty_driver_install_tty() - install a tty entry in the driver
1295 * Install a tty object into the driver tables. The @tty->index field will be
1304 return driver->ops->install ? driver->ops->install(driver, tty) : in tty_driver_install_tty()
1309 * tty_driver_remove_tty() - remove a tty from the driver tables
1313 * Remove a tty object from the driver tables. The tty->index field will be set
1320 if (driver->ops->remove) in tty_driver_remove_tty()
1321 driver->ops->remove(driver, tty); in tty_driver_remove_tty()
1323 driver->ttys[tty->index] = NULL; in tty_driver_remove_tty()
1327 * tty_reopen() - fast re-open of an open tty
1330 * Re-opens on master ptys are not allowed and return -%EIO.
1333 * Return: 0 on success, -errno on error.
1337 struct tty_driver *driver = tty->driver; in tty_reopen()
1341 if (driver->type == TTY_DRIVER_TYPE_PTY && in tty_reopen()
1342 driver->subtype == PTY_TYPE_MASTER) in tty_reopen()
1343 return -EIO; in tty_reopen()
1345 if (!tty->count) in tty_reopen()
1346 return -EAGAIN; in tty_reopen()
1348 if (test_bit(TTY_EXCLUSIVE, &tty->flags) && !capable(CAP_SYS_ADMIN)) in tty_reopen()
1349 return -EBUSY; in tty_reopen()
1359 if (!tty->ldisc) in tty_reopen()
1360 retval = tty_ldisc_reinit(tty, tty->termios.c_line); in tty_reopen()
1365 tty->count++; in tty_reopen()
1371 * tty_init_dev - initialise a tty device
1406 if (!try_module_get(driver->owner)) in tty_init_dev()
1407 return ERR_PTR(-ENODEV); in tty_init_dev()
1411 retval = -ENOMEM; in tty_init_dev()
1420 if (!tty->port) in tty_init_dev()
1421 tty->port = driver->ports[idx]; in tty_init_dev()
1423 if (WARN_RATELIMIT(!tty->port, in tty_init_dev()
1424 "%s: %s driver does not set tty->port. This would crash the kernel. Fix the driver!\n", in tty_init_dev()
1425 __func__, tty->driver->name)) { in tty_init_dev()
1426 retval = -EINVAL; in tty_init_dev()
1433 tty->port->itty = tty; in tty_init_dev()
1440 retval = tty_ldisc_setup(tty, tty->link); in tty_init_dev()
1451 module_put(driver->owner); in tty_init_dev()
1466 * tty_save_termios() - save tty termios data in driver table
1474 int idx = tty->index; in tty_save_termios()
1477 if (tty->driver->flags & TTY_DRIVER_RESET_TERMIOS) in tty_save_termios()
1481 tp = tty->driver->termios[idx]; in tty_save_termios()
1486 tty->driver->termios[idx] = tp; in tty_save_termios()
1488 *tp = tty->termios; in tty_save_termios()
1493 * tty_flush_works - flush all works of a tty/pty pair
1500 flush_work(&tty->SAK_work); in tty_flush_works()
1501 flush_work(&tty->hangup_work); in tty_flush_works()
1502 if (tty->link) { in tty_flush_works()
1503 flush_work(&tty->link->SAK_work); in tty_flush_works()
1504 flush_work(&tty->link->hangup_work); in tty_flush_works()
1509 * release_one_tty - release tty structure memory
1527 struct tty_driver *driver = tty->driver; in release_one_tty()
1528 struct module *owner = driver->owner; in release_one_tty()
1530 if (tty->ops->cleanup) in release_one_tty()
1531 tty->ops->cleanup(tty); in release_one_tty()
1536 spin_lock(&tty->files_lock); in release_one_tty()
1537 list_del_init(&tty->tty_files); in release_one_tty()
1538 spin_unlock(&tty->files_lock); in release_one_tty()
1540 put_pid(tty->ctrl.pgrp); in release_one_tty()
1541 put_pid(tty->ctrl.session); in release_one_tty()
1552 INIT_WORK(&tty->hangup_work, release_one_tty); in queue_release_one_tty()
1553 schedule_work(&tty->hangup_work); in queue_release_one_tty()
1557 * tty_kref_put - release a tty kref
1566 kref_put(&tty->kref, queue_release_one_tty); in tty_kref_put()
1571 * release_tty - release tty structure memory
1586 WARN_ON(tty->index != idx); in release_tty()
1588 if (tty->ops->shutdown) in release_tty()
1589 tty->ops->shutdown(tty); in release_tty()
1591 tty_driver_remove_tty(tty->driver, tty); in release_tty()
1592 if (tty->port) in release_tty()
1593 tty->port->itty = NULL; in release_tty()
1594 if (tty->link) in release_tty()
1595 tty->link->port->itty = NULL; in release_tty()
1596 if (tty->port) in release_tty()
1597 tty_buffer_cancel_work(tty->port); in release_tty()
1598 if (tty->link) in release_tty()
1599 tty_buffer_cancel_work(tty->link->port); in release_tty()
1601 tty_kref_put(tty->link); in release_tty()
1606 * tty_release_checks - check a tty before real release
1611 * no-op unless %TTY_PARANOIA_CHECK is defined.
1616 if (idx < 0 || idx >= tty->driver->num) { in tty_release_checks()
1618 return -1; in tty_release_checks()
1622 if (tty->driver->flags & TTY_DRIVER_DEVPTS_MEM) in tty_release_checks()
1625 if (tty != tty->driver->ttys[idx]) { in tty_release_checks()
1627 idx, tty->driver->ttys[idx]); in tty_release_checks()
1628 return -1; in tty_release_checks()
1630 if (tty->driver->other) { in tty_release_checks()
1631 struct tty_struct *o_tty = tty->link; in tty_release_checks()
1633 if (o_tty != tty->driver->other->ttys[idx]) { in tty_release_checks()
1635 idx, tty->driver->other->ttys[idx]); in tty_release_checks()
1636 return -1; in tty_release_checks()
1638 if (o_tty->link != tty) { in tty_release_checks()
1639 tty_debug(tty, "bad link = %p\n", o_tty->link); in tty_release_checks()
1640 return -1; in tty_release_checks()
1648 * tty_kclose - closes tty opened by tty_kopen
1653 * @tty->port.
1671 tty_port_set_kopened(tty->port, 0); in tty_kclose()
1672 release_tty(tty, tty->index); in tty_kclose()
1678 * tty_release_struct - release a tty struct
1707 * tty_release - vfs callback for close
1739 __tty_fasync(-1, filp, 0); in tty_release()
1741 idx = tty->index; in tty_release()
1742 if (tty->driver->type == TTY_DRIVER_TYPE_PTY && in tty_release()
1743 tty->driver->subtype == PTY_TYPE_MASTER) in tty_release()
1744 o_tty = tty->link; in tty_release()
1751 tty_debug_hangup(tty, "releasing (count=%d)\n", tty->count); in tty_release()
1753 if (tty->ops->close) in tty_release()
1754 tty->ops->close(tty, filp); in tty_release()
1760 * Sanity check: if tty->count is going to zero, there shouldn't be in tty_release()
1761 * any waiters on tty->read_wait or tty->write_wait. We test the in tty_release()
1775 if (tty->count <= 1) { in tty_release()
1776 if (waitqueue_active(&tty->read_wait)) { in tty_release()
1777 wake_up_poll(&tty->read_wait, EPOLLIN); in tty_release()
1780 if (waitqueue_active(&tty->write_wait)) { in tty_release()
1781 wake_up_poll(&tty->write_wait, EPOLLOUT); in tty_release()
1785 if (o_tty && o_tty->count <= 1) { in tty_release()
1786 if (waitqueue_active(&o_tty->read_wait)) { in tty_release()
1787 wake_up_poll(&o_tty->read_wait, EPOLLIN); in tty_release()
1790 if (waitqueue_active(&o_tty->write_wait)) { in tty_release()
1791 wake_up_poll(&o_tty->write_wait, EPOLLOUT); in tty_release()
1810 if (--o_tty->count < 0) { in tty_release()
1811 tty_warn(tty, "bad slave count (%d)\n", o_tty->count); in tty_release()
1812 o_tty->count = 0; in tty_release()
1815 if (--tty->count < 0) { in tty_release()
1816 tty_warn(tty, "bad tty->count (%d)\n", tty->count); in tty_release()
1817 tty->count = 0; in tty_release()
1821 * We've decremented tty->count, so we need to remove this file in tty_release()
1822 * descriptor off the tty->tty_files list; this serves two in tty_release()
1824 * - check_tty_count sees the correct number of file descriptors in tty_release()
1826 * - do_tty_hangup no longer sees this file descriptor as in tty_release()
1838 if (!tty->count) { in tty_release()
1840 session_clear_tty(tty->ctrl.session); in tty_release()
1842 session_clear_tty(o_tty->ctrl.session); in tty_release()
1847 final = !tty->count && !(o_tty && o_tty->count); in tty_release()
1852 /* At this point, the tty->count == 0 should ensure a dead tty in tty_release()
1853 * cannot be re-opened by a racing opener. in tty_release()
1866 * tty_open_current_tty - get locked tty of current task
1871 * Performs a re-open of the current task's controlling tty.
1886 return ERR_PTR(-ENXIO); in tty_open_current_tty()
1888 filp->f_flags |= O_NONBLOCK; /* Don't let /dev/tty block */ in tty_open_current_tty()
1902 * tty_lookup_driver - lookup a tty driver for a given device file
1936 filp->f_flags |= O_NONBLOCK; in tty_lookup_driver()
1942 return ERR_PTR(-ENODEV); in tty_lookup_driver()
1947 return ERR_PTR(-ENODEV); in tty_lookup_driver()
1957 int index = -1; in tty_kopen()
1974 tty = ERR_PTR(-EBUSY); in tty_kopen()
1979 tty_port_set_kopened(tty->port, 1); in tty_kopen()
1988 * tty_kopen_exclusive - open a tty device for kernel
1992 * it's not already opened and performs the first-time tty initialization.
1995 * * concurrent first-time tty initialization
2008 * tty_kopen_shared - open a tty device for shared in-kernel use
2011 * Opens an already existing tty for in-kernel use. Compared to
2023 * tty_open_by_driver - open a tty device
2028 * first-time tty initialization.
2032 * * concurrent first-time tty initialization
2036 * Return: the locked initialized or re-opened &tty_struct
2043 int index = -1; in tty_open_by_driver()
2061 if (tty_port_kopened(tty->port)) { in tty_open_by_driver()
2064 tty = ERR_PTR(-EBUSY); in tty_open_by_driver()
2071 if (retval == -EINTR) in tty_open_by_driver()
2072 retval = -ERESTARTSYS; in tty_open_by_driver()
2091 * tty_open - open a tty device
2096 * of opens done on a tty. We cannot use the inode-count, as different inodes
2099 * Open-counting is needed for pty masters, as well as for keeping track of
2101 * (This is not done solely through tty->count, now. - Ted 1/27/92)
2108 * * @tty->count should protect the rest.
2109 * * ->siglock protects ->signal/->sighand
2117 dev_t device = inode->i_rdev; in tty_open()
2118 unsigned saved_flags = filp->f_flags; in tty_open()
2125 return -ENOMEM; in tty_open()
2134 if (retval != -EAGAIN || signal_pending(current)) in tty_open()
2143 tty_debug_hangup(tty, "opening (count=%d)\n", tty->count); in tty_open()
2145 if (tty->ops->open) in tty_open()
2146 retval = tty->ops->open(tty, filp); in tty_open()
2148 retval = -ENODEV; in tty_open()
2149 filp->f_flags = saved_flags; in tty_open()
2156 if (retval != -ERESTARTSYS) in tty_open()
2167 filp->f_op = &tty_fops; in tty_open()
2170 clear_bit(TTY_HUPPED, &tty->flags); in tty_open()
2172 noctty = (filp->f_flags & O_NOCTTY) || in tty_open()
2175 (tty->driver->type == TTY_DRIVER_TYPE_PTY && in tty_open()
2176 tty->driver->subtype == PTY_TYPE_MASTER); in tty_open()
2185 * tty_poll - check tty status
2193 * re-entered freely by other callers.
2207 if (ld->ops->poll) in tty_poll()
2208 ret = ld->ops->poll(tty, filp, wait); in tty_poll()
2228 retval = fasync_helper(fd, filp, on, &tty->fasync); in __tty_fasync()
2236 spin_lock_irqsave(&tty->ctrl.lock, flags); in __tty_fasync()
2237 if (tty->ctrl.pgrp) { in __tty_fasync()
2238 pid = tty->ctrl.pgrp; in __tty_fasync()
2245 spin_unlock_irqrestore(&tty->ctrl.lock, flags); in __tty_fasync()
2257 int retval = -ENOTTY; in tty_fasync()
2269 * tiocsti - fake input character
2279 * * current->signal->tty check is safe without locks
2287 return -EIO; in tiocsti()
2289 if ((current->signal->tty != tty) && !capable(CAP_SYS_ADMIN)) in tiocsti()
2290 return -EPERM; in tiocsti()
2292 return -EFAULT; in tiocsti()
2296 return -EIO; in tiocsti()
2297 tty_buffer_lock_exclusive(tty->port); in tiocsti()
2298 if (ld->ops->receive_buf) in tiocsti()
2299 ld->ops->receive_buf(tty, &ch, NULL, 1); in tiocsti()
2300 tty_buffer_unlock_exclusive(tty->port); in tiocsti()
2306 * tiocgwinsz - implement window query ioctl
2312 * Locking: @tty->winsize_mutex is taken to ensure the winsize data is
2319 mutex_lock(&tty->winsize_mutex); in tiocgwinsz()
2320 err = copy_to_user(arg, &tty->winsize, sizeof(*arg)); in tiocgwinsz()
2321 mutex_unlock(&tty->winsize_mutex); in tiocgwinsz()
2323 return err ? -EFAULT : 0; in tiocgwinsz()
2327 * tty_do_resize - resize event
2339 mutex_lock(&tty->winsize_mutex); in tty_do_resize()
2340 if (!memcmp(ws, &tty->winsize, sizeof(*ws))) in tty_do_resize()
2349 tty->winsize = *ws; in tty_do_resize()
2351 mutex_unlock(&tty->winsize_mutex); in tty_do_resize()
2357 * tiocswinsz - implement window size set ioctl
2375 return -EFAULT; in tiocswinsz()
2377 if (tty->ops->resize) in tiocswinsz()
2378 return tty->ops->resize(tty, &tmp_ws); in tiocswinsz()
2384 * tioccons - allow admin to move logical console
2394 return -EPERM; in tioccons()
2395 if (file->f_op->write_iter == redirected_tty_write) { in tioccons()
2406 if (file->f_op->write_iter != tty_write) in tioccons()
2407 return -ENOTTY; in tioccons()
2408 if (!(file->f_mode & FMODE_WRITE)) in tioccons()
2409 return -EBADF; in tioccons()
2410 if (!(file->f_mode & FMODE_CAN_WRITE)) in tioccons()
2411 return -EINVAL; in tioccons()
2415 return -EBUSY; in tioccons()
2423 * tiocsetd - set line discipline
2437 return -EFAULT; in tiocsetd()
2445 * tiocgetd - get line discipline
2461 return -EIO; in tiocgetd()
2462 ret = put_user(ld->ops->num, p); in tiocgetd()
2468 * send_break - performed time break
2476 * @tty->atomic_write_lock serializes
2482 if (tty->ops->break_ctl == NULL) in send_break()
2485 if (tty->driver->flags & TTY_DRIVER_HARDWARE_BREAK) in send_break()
2486 return tty->ops->break_ctl(tty, duration); in send_break()
2490 return -EINTR; in send_break()
2492 retval = tty->ops->break_ctl(tty, -1); in send_break()
2495 retval = tty->ops->break_ctl(tty, 0); in send_break()
2496 } else if (retval == -EOPNOTSUPP) { in send_break()
2503 retval = -EINTR; in send_break()
2509 * tty_get_tiocm - get tiocm status register
2512 * Obtain the modem status bits from the tty driver if the feature
2517 int retval = -ENOTTY; in tty_get_tiocm()
2519 if (tty->ops->tiocmget) in tty_get_tiocm()
2520 retval = tty->ops->tiocmget(tty); in tty_get_tiocm()
2527 * tty_tiocmget - get modem status
2531 * Obtain the modem status bits from the tty driver if the feature is
2532 * supported. Return -%ENOTTY if it is not available.
2548 * tty_tiocmset - set modem status
2550 * @cmd: command - clear bits, set bits or set all
2551 * @p: pointer to desired bits
2553 * Set the modem status bits from the tty driver if the feature
2554 * is supported. Return -%ENOTTY if it is not available.
2564 if (tty->ops->tiocmset == NULL) in tty_tiocmset()
2565 return -ENOTTY; in tty_tiocmset()
2585 return tty->ops->tiocmset(tty, set, clear); in tty_tiocmset()
2589 * tty_get_icount - get tty statistics
2602 if (tty->ops->get_icount) in tty_get_icount()
2603 return tty->ops->get_icount(tty, icount); in tty_get_icount()
2605 return -ENOTTY; in tty_get_icount()
2619 return -EFAULT; in tty_tiocgicount()
2623 static int tty_set_serial(struct tty_struct *tty, struct serial_struct *ss) in tty_set_serial() argument
2627 flags = ss->flags & ASYNC_DEPRECATED; in tty_set_serial()
2631 __func__, current->comm, flags); in tty_set_serial()
2633 if (!tty->ops->set_serial) in tty_set_serial()
2634 return -ENOTTY; in tty_set_serial()
2636 return tty->ops->set_serial(tty, ss); in tty_set_serial()
2639 static int tty_tiocsserial(struct tty_struct *tty, struct serial_struct __user *ss) in tty_tiocsserial() argument
2643 if (copy_from_user(&v, ss, sizeof(*ss))) in tty_tiocsserial()
2644 return -EFAULT; in tty_tiocsserial()
2649 static int tty_tiocgserial(struct tty_struct *tty, struct serial_struct __user *ss) in tty_tiocgserial() argument
2655 if (!tty->ops->get_serial) in tty_tiocgserial()
2656 return -ENOTTY; in tty_tiocgserial()
2657 err = tty->ops->get_serial(tty, &v); in tty_tiocgserial()
2658 if (!err && copy_to_user(ss, &v, sizeof(v))) in tty_tiocgserial()
2659 err = -EFAULT; in tty_tiocgserial()
2669 if (tty->driver->type == TTY_DRIVER_TYPE_PTY && in tty_pair_get_tty()
2670 tty->driver->subtype == PTY_TYPE_MASTER) in tty_pair_get_tty()
2671 tty = tty->link; in tty_pair_get_tty()
2687 return -EINVAL; in tty_ioctl()
2706 return -EINTR; in tty_ioctl()
2722 return real_tty != tty ? -EINVAL : tioccons(file); in tty_ioctl()
2724 set_bit(TTY_EXCLUSIVE, &tty->flags); in tty_ioctl()
2727 clear_bit(TTY_EXCLUSIVE, &tty->flags); in tty_ioctl()
2731 int excl = test_bit(TTY_EXCLUSIVE, &tty->flags); in tty_ioctl()
2741 return -EPERM; in tty_ioctl()
2754 if (tty->ops->break_ctl) in tty_ioctl()
2755 return tty->ops->break_ctl(tty, -1); in tty_ioctl()
2758 if (tty->ops->break_ctl) in tty_ioctl()
2759 return tty->ops->break_ctl(tty, 0); in tty_ioctl()
2761 case TCSBRK: /* SVID version: non-zero arg --> no break */ in tty_ioctl()
2762 /* non-zero arg means wait for all output data in tty_ioctl()
2798 if (retval != -ENOIOCTLCMD) in tty_ioctl()
2801 if (tty->ops->ioctl) { in tty_ioctl()
2802 retval = tty->ops->ioctl(tty, cmd, arg); in tty_ioctl()
2803 if (retval != -ENOIOCTLCMD) in tty_ioctl()
2809 retval = -EINVAL; in tty_ioctl()
2810 if (ld->ops->ioctl) { in tty_ioctl()
2811 retval = ld->ops->ioctl(tty, cmd, arg); in tty_ioctl()
2812 if (retval == -ENOIOCTLCMD) in tty_ioctl()
2813 retval = -ENOTTY; in tty_ioctl()
2844 struct serial_struct32 __user *ss) in compat_tty_tiocsserial() argument
2849 if (copy_from_user(&v32, ss, sizeof(*ss))) in compat_tty_tiocsserial()
2850 return -EFAULT; in compat_tty_tiocsserial()
2862 struct serial_struct32 __user *ss) in compat_tty_tiocgserial() argument
2871 if (!tty->ops->get_serial) in compat_tty_tiocgserial()
2872 return -ENOTTY; in compat_tty_tiocgserial()
2873 err = tty->ops->get_serial(tty, &v); in compat_tty_tiocgserial()
2880 if (copy_to_user(ss, &v32, sizeof(v32))) in compat_tty_tiocgserial()
2881 err = -EFAULT; in compat_tty_tiocgserial()
2890 int retval = -ENOIOCTLCMD; in tty_compat_ioctl()
2972 return -EINVAL; in tty_compat_ioctl()
2980 if (tty->ops->compat_ioctl) { in tty_compat_ioctl()
2981 retval = tty->ops->compat_ioctl(tty, cmd, arg); in tty_compat_ioctl()
2982 if (retval != -ENOIOCTLCMD) in tty_compat_ioctl()
2989 if (ld->ops->compat_ioctl) in tty_compat_ioctl()
2990 retval = ld->ops->compat_ioctl(tty, cmd, arg); in tty_compat_ioctl()
2991 if (retval == -ENOIOCTLCMD && ld->ops->ioctl) in tty_compat_ioctl()
2992 retval = ld->ops->ioctl(tty, (unsigned long)compat_ptr(cmd), in tty_compat_ioctl()
3002 if (likely(file->f_op->read_iter != tty_read)) in this_tty()
3008 * This implements the "Secure Attention Key" --- the idea is to
3011 * super-paranoid applications --- see the Orange Book for more details.
3019 * Now, if it would be correct ;-/ The current code has a nasty hole -
3024 * deadlock. We punt it up to process context. AKPM - 16Mar2001
3033 spin_lock_irqsave(&tty->ctrl.lock, flags); in __do_SAK()
3034 session = get_pid(tty->ctrl.session); in __do_SAK()
3035 spin_unlock_irqrestore(&tty->ctrl.lock, flags); in __do_SAK()
3045 task_pid_nr(p), p->comm); in __do_SAK()
3051 if (p->signal->tty == tty) { in __do_SAK()
3053 task_pid_nr(p), p->comm); in __do_SAK()
3059 i = iterate_fd(p->files, 0, this_tty, tty); in __do_SAK()
3062 task_pid_nr(p), p->comm, i - 1); in __do_SAK()
3080 * The tq handling here is a little racy - tty->SAK_work may already be queued.
3081 * Fortunately we don't need to worry, because if ->SAK_work is already queued,
3083 * already has. --akpm
3089 schedule_work(&tty->SAK_work); in do_SAK()
3103 * alloc_tty_struct - allocate a new tty
3109 * Locking: none - @tty in question is not exposed at this point
3119 kref_init(&tty->kref); in alloc_tty_struct()
3124 tty->ctrl.session = NULL; in alloc_tty_struct()
3125 tty->ctrl.pgrp = NULL; in alloc_tty_struct()
3126 mutex_init(&tty->legacy_mutex); in alloc_tty_struct()
3127 mutex_init(&tty->throttle_mutex); in alloc_tty_struct()
3128 init_rwsem(&tty->termios_rwsem); in alloc_tty_struct()
3129 mutex_init(&tty->winsize_mutex); in alloc_tty_struct()
3130 init_ldsem(&tty->ldisc_sem); in alloc_tty_struct()
3131 init_waitqueue_head(&tty->write_wait); in alloc_tty_struct()
3132 init_waitqueue_head(&tty->read_wait); in alloc_tty_struct()
3133 INIT_WORK(&tty->hangup_work, do_tty_hangup); in alloc_tty_struct()
3134 mutex_init(&tty->atomic_write_lock); in alloc_tty_struct()
3135 spin_lock_init(&tty->ctrl.lock); in alloc_tty_struct()
3136 spin_lock_init(&tty->flow.lock); in alloc_tty_struct()
3137 spin_lock_init(&tty->files_lock); in alloc_tty_struct()
3138 INIT_LIST_HEAD(&tty->tty_files); in alloc_tty_struct()
3139 INIT_WORK(&tty->SAK_work, do_SAK_work); in alloc_tty_struct()
3141 tty->driver = driver; in alloc_tty_struct()
3142 tty->ops = driver->ops; in alloc_tty_struct()
3143 tty->index = idx; in alloc_tty_struct()
3144 tty_line_name(driver, idx, tty->name); in alloc_tty_struct()
3145 tty->dev = tty_get_device(tty); in alloc_tty_struct()
3151 * tty_put_char - write one character to a tty
3155 * Write one byte to the @tty using the provided @tty->ops->put_char() method
3165 if (tty->ops->put_char) in tty_put_char()
3166 return tty->ops->put_char(tty, ch); in tty_put_char()
3167 return tty->ops->write(tty, &ch, 1); in tty_put_char()
3177 driver->cdevs[index] = cdev_alloc(); in tty_cdev_add()
3178 if (!driver->cdevs[index]) in tty_cdev_add()
3179 return -ENOMEM; in tty_cdev_add()
3180 driver->cdevs[index]->ops = &tty_fops; in tty_cdev_add()
3181 driver->cdevs[index]->owner = driver->owner; in tty_cdev_add()
3182 err = cdev_add(driver->cdevs[index], dev, count); in tty_cdev_add()
3184 kobject_put(&driver->cdevs[index]->kobj); in tty_cdev_add()
3189 * tty_register_device - register a tty device
3204 * ERR_PTR(-EFOO) on error).
3220 * tty_register_device_attr - register a tty device
3236 * ERR_PTR(-EFOO) on error).
3244 dev_t devt = MKDEV(driver->major, driver->minor_start) + index; in tty_register_device_attr()
3249 if (index >= driver->num) { in tty_register_device_attr()
3251 driver->name, index); in tty_register_device_attr()
3252 return ERR_PTR(-EINVAL); in tty_register_device_attr()
3255 if (driver->type == TTY_DRIVER_TYPE_PTY) in tty_register_device_attr()
3262 return ERR_PTR(-ENOMEM); in tty_register_device_attr()
3264 dev->devt = devt; in tty_register_device_attr()
3265 dev->class = &tty_class; in tty_register_device_attr()
3266 dev->parent = device; in tty_register_device_attr()
3267 dev->release = tty_device_create_release; in tty_register_device_attr()
3269 dev->groups = attr_grp; in tty_register_device_attr()
3278 if (!(driver->flags & TTY_DRIVER_DYNAMIC_ALLOC)) { in tty_register_device_attr()
3283 tp = driver->termios[index]; in tty_register_device_attr()
3285 driver->termios[index] = NULL; in tty_register_device_attr()
3295 kobject_uevent(&dev->kobj, KOBJ_ADD); in tty_register_device_attr()
3309 * tty_unregister_device - unregister a tty device
3320 device_destroy(&tty_class, MKDEV(driver->major, driver->minor_start) + index); in tty_unregister_device()
3321 if (!(driver->flags & TTY_DRIVER_DYNAMIC_ALLOC)) { in tty_unregister_device()
3322 cdev_del(driver->cdevs[index]); in tty_unregister_device()
3323 driver->cdevs[index] = NULL; in tty_unregister_device()
3329 * __tty_alloc_driver - allocate tty driver
3332 * @flags: some of %TTY_DRIVER_ flags, will be set in driver->flags
3345 return ERR_PTR(-EINVAL); in __tty_alloc_driver()
3349 return ERR_PTR(-ENOMEM); in __tty_alloc_driver()
3351 kref_init(&driver->kref); in __tty_alloc_driver()
3352 driver->num = lines; in __tty_alloc_driver()
3353 driver->owner = owner; in __tty_alloc_driver()
3354 driver->flags = flags; in __tty_alloc_driver()
3357 driver->ttys = kcalloc(lines, sizeof(*driver->ttys), in __tty_alloc_driver()
3359 driver->termios = kcalloc(lines, sizeof(*driver->termios), in __tty_alloc_driver()
3361 if (!driver->ttys || !driver->termios) { in __tty_alloc_driver()
3362 err = -ENOMEM; in __tty_alloc_driver()
3368 driver->ports = kcalloc(lines, sizeof(*driver->ports), in __tty_alloc_driver()
3370 if (!driver->ports) { in __tty_alloc_driver()
3371 err = -ENOMEM; in __tty_alloc_driver()
3377 driver->cdevs = kcalloc(cdevs, sizeof(*driver->cdevs), GFP_KERNEL); in __tty_alloc_driver()
3378 if (!driver->cdevs) { in __tty_alloc_driver()
3379 err = -ENOMEM; in __tty_alloc_driver()
3385 kfree(driver->ports); in __tty_alloc_driver()
3386 kfree(driver->ttys); in __tty_alloc_driver()
3387 kfree(driver->termios); in __tty_alloc_driver()
3388 kfree(driver->cdevs); in __tty_alloc_driver()
3400 if (driver->flags & TTY_DRIVER_INSTALLED) { in destruct_tty_driver()
3401 for (i = 0; i < driver->num; i++) { in destruct_tty_driver()
3402 tp = driver->termios[i]; in destruct_tty_driver()
3404 driver->termios[i] = NULL; in destruct_tty_driver()
3407 if (!(driver->flags & TTY_DRIVER_DYNAMIC_DEV)) in destruct_tty_driver()
3411 if (driver->flags & TTY_DRIVER_DYNAMIC_ALLOC) in destruct_tty_driver()
3412 cdev_del(driver->cdevs[0]); in destruct_tty_driver()
3414 kfree(driver->cdevs); in destruct_tty_driver()
3415 kfree(driver->ports); in destruct_tty_driver()
3416 kfree(driver->termios); in destruct_tty_driver()
3417 kfree(driver->ttys); in destruct_tty_driver()
3422 * tty_driver_kref_put - drop a reference to a tty driver
3429 kref_put(&driver->kref, destruct_tty_driver); in tty_driver_kref_put()
3434 * tty_register_driver - register a tty driver
3446 if (!driver->major) { in tty_register_driver()
3447 error = alloc_chrdev_region(&dev, driver->minor_start, in tty_register_driver()
3448 driver->num, driver->name); in tty_register_driver()
3450 driver->major = MAJOR(dev); in tty_register_driver()
3451 driver->minor_start = MINOR(dev); in tty_register_driver()
3454 dev = MKDEV(driver->major, driver->minor_start); in tty_register_driver()
3455 error = register_chrdev_region(dev, driver->num, driver->name); in tty_register_driver()
3460 if (driver->flags & TTY_DRIVER_DYNAMIC_ALLOC) { in tty_register_driver()
3461 error = tty_cdev_add(driver, dev, 0, driver->num); in tty_register_driver()
3467 list_add(&driver->tty_drivers, &tty_drivers); in tty_register_driver()
3470 if (!(driver->flags & TTY_DRIVER_DYNAMIC_DEV)) { in tty_register_driver()
3471 for (i = 0; i < driver->num; i++) { in tty_register_driver()
3480 driver->flags |= TTY_DRIVER_INSTALLED; in tty_register_driver()
3484 for (i--; i >= 0; i--) in tty_register_driver()
3488 list_del(&driver->tty_drivers); in tty_register_driver()
3492 unregister_chrdev_region(dev, driver->num); in tty_register_driver()
3499 * tty_unregister_driver - unregister a tty driver
3506 unregister_chrdev_region(MKDEV(driver->major, driver->minor_start), in tty_unregister_driver()
3507 driver->num); in tty_unregister_driver()
3509 list_del(&driver->tty_drivers); in tty_unregister_driver()
3516 return MKDEV(tty->driver->major, tty->driver->minor_start) + tty->index; in tty_devnum()
3529 if (dev->devt == MKDEV(TTYAUX_MAJOR, 0) || in tty_devnode()
3530 dev->devt == MKDEV(TTYAUX_MAJOR, 2)) in tty_devnode()
3562 * race-free reading of @flags. in show_cons_active()
3567 if (!c->device) in show_cons_active()
3569 if (!(c->flags & CON_NBCON) && !c->write) in show_cons_active()
3571 if ((c->flags & CON_ENABLED) == 0) in show_cons_active()
3584 while (i--) { in show_cons_active()
3585 int index = cs[i]->index; in show_cons_active()
3586 struct tty_driver *drv = cs[i]->device(cs[i], &index); in show_cons_active()
3589 if (drv && (cs[i]->index > 0 || drv->major != TTY_MAJOR)) in show_cons_active()
3593 cs[i]->name, cs[i]->index); in show_cons_active()
3617 sysfs_notify(&consdev->kobj, NULL, "active"); in console_sysfs_notify()