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 <alfie@dcs.warwick.ac.uk>, 27th May 1993.
36 * -- julian@uhunix.uhcc.hawaii.edu (J. Cowley), 13Jan94
39 * -- ctm@ardi.com, 9Sep95
42 * -- mj@k332.feld.cvut.cz, 19-Nov-95
45 * -- grif@cs.ucr.edu, 5-Dec-95
49 * -- Marko Kohtala <Marko.Kohtala@hut.fi>, March 97
52 * -- Bill Hawes <whawes@star.net>, June 97
55 * -- C. Scott Ananian <cananian@alumni.princeton.edu>, 13-Jan-1998
57 * Added support for a Unix98-style ptmx device.
58 * -- C. Scott Ananian <cananian@alumni.princeton.edu>, 14-Jan-1998
61 * -- Russell King <rmk@arm.linux.org.uk>
65 * -- Andrew Morton <andrewm@uow.edu.eu> 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()
356 if (prefix_length == strlen(p->name) && strncmp(name, in tty_dev_name_to_number()
357 p->name, prefix_length) == 0) { in tty_dev_name_to_number()
358 if (index < p->num) { in tty_dev_name_to_number()
359 *number = MKDEV(p->major, p->minor_start + index); in tty_dev_name_to_number()
365 ret = -ENODEV; in tty_dev_name_to_number()
375 * tty_find_polling_driver - find device of a polled tty
395 len = str - name; in tty_find_polling_driver()
401 if (!len || strncmp(name, p->name, len) != 0) in tty_find_polling_driver()
409 if (tty_line >= 0 && tty_line < p->num && p->ops && in tty_find_polling_driver()
410 p->ops->poll_init && !p->ops->poll_init(p, tty_line, stp)) { in tty_find_polling_driver()
430 return -EIO; in hung_up_tty_write()
433 /* No kernel lock held - none needed ;) */
442 return cmd == TIOCSPGRP ? -ENOTTY : -EIO; in hung_up_tty_ioctl()
448 return cmd == TIOCSPGRP ? -ENOTTY : -EIO; in hung_up_tty_compat_ioctl()
453 return -ENOTTY; in hung_up_tty_fasync()
460 if (tty && tty->ops && tty->ops->show_fdinfo) in tty_show_fdinfo()
461 tty->ops->show_fdinfo(tty, m); in tty_show_fdinfo()
508 * tty_wakeup - request more data
519 if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags)) { in tty_wakeup()
522 if (ld->ops->write_wakeup) in tty_wakeup()
523 ld->ops->write_wakeup(tty); in tty_wakeup()
527 wake_up_interruptible_poll(&tty->write_wait, EPOLLOUT); in tty_wakeup()
532 * tty_release_redirect - Release a redirect on a pty if present
553 * __tty_hangup - actual handler for hangup events
555 * @exit_session: if non-zero, signal all foreground group processes
574 * * ->siglock to protect ->signal/->sighand
592 if (test_bit(TTY_HUPPED, &tty->flags)) { in __tty_hangup()
603 set_bit(TTY_HUPPING, &tty->flags); in __tty_hangup()
611 spin_lock(&tty->files_lock); in __tty_hangup()
613 list_for_each_entry(priv, &tty->tty_files, list) { in __tty_hangup()
614 filp = priv->file; in __tty_hangup()
615 if (filp->f_op->write_iter == redirected_tty_write) in __tty_hangup()
617 if (filp->f_op->write_iter != tty_write) in __tty_hangup()
620 __tty_fasync(-1, filp, 0); /* can't block */ in __tty_hangup()
621 filp->f_op = &hung_up_tty_fops; in __tty_hangup()
623 spin_unlock(&tty->files_lock); in __tty_hangup()
626 /* Account for the p->signal references we killed */ in __tty_hangup()
627 while (refs--) in __tty_hangup()
632 spin_lock_irq(&tty->ctrl.lock); in __tty_hangup()
633 clear_bit(TTY_THROTTLED, &tty->flags); in __tty_hangup()
634 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); in __tty_hangup()
635 put_pid(tty->ctrl.session); in __tty_hangup()
636 put_pid(tty->ctrl.pgrp); in __tty_hangup()
637 tty->ctrl.session = NULL; in __tty_hangup()
638 tty->ctrl.pgrp = NULL; in __tty_hangup()
639 tty->ctrl.pktstatus = 0; in __tty_hangup()
640 spin_unlock_irq(&tty->ctrl.lock); in __tty_hangup()
645 * tty->count and state->count to go out of sync. in __tty_hangup()
649 if (tty->ops->close) in __tty_hangup()
651 tty->ops->close(tty, cons_filp); in __tty_hangup()
652 } else if (tty->ops->hangup) in __tty_hangup()
653 tty->ops->hangup(tty); in __tty_hangup()
656 * we did here. The driver layer expects no calls after ->hangup() in __tty_hangup()
659 set_bit(TTY_HUPPED, &tty->flags); in __tty_hangup()
660 clear_bit(TTY_HUPPING, &tty->flags); in __tty_hangup()
676 * tty_hangup - trigger a hangup event
685 schedule_work(&tty->hangup_work); in tty_hangup()
690 * tty_vhangup - process vhangup
706 * tty_vhangup_self - process vhangup for own ctty
722 * tty_vhangup_session - hangup session leader exit
738 * tty_hung_up_p - was tty hung up
745 return (filp && filp->f_op == &hung_up_tty_fops); in tty_hung_up_p()
751 if (tty->flow.stopped) in __stop_tty()
753 tty->flow.stopped = true; in __stop_tty()
754 if (tty->ops->stop) in __stop_tty()
755 tty->ops->stop(tty); in __stop_tty()
759 * stop_tty - propagate flow control
763 * device and will not re-call the &tty_driver->stop() method.
776 spin_lock_irqsave(&tty->flow.lock, flags); in stop_tty()
778 spin_unlock_irqrestore(&tty->flow.lock, flags); in stop_tty()
784 if (!tty->flow.stopped || tty->flow.tco_stopped) in __start_tty()
786 tty->flow.stopped = false; in __start_tty()
787 if (tty->ops->start) in __start_tty()
788 tty->ops->start(tty); in __start_tty()
793 * start_tty - propagate flow control
797 * stopped and is now being started, the &tty_driver->start() method is invoked
807 spin_lock_irqsave(&tty->flow.lock, flags); in start_tty()
809 spin_unlock_irqrestore(&tty->flow.lock, flags); in start_tty()
818 spin_lock(&tty->files_lock); in tty_update_time()
819 list_for_each_entry(priv, &tty->tty_files, list) { in tty_update_time()
820 struct inode *inode = file_inode(priv->file); in tty_update_time()
825 * lower three bits (i.e every 8 seconds). If so, then we can update in tty_update_time()
836 spin_unlock(&tty->files_lock); in tty_update_time()
840 * Iterate on the ldisc ->read() function until we've gotten all
862 size = ld->ops->read(tty, file, kernel_buf, size, &cookie, offset); in iterate_tty_read()
867 /* Did we have an earlier error (ie -EFAULT)? */ in iterate_tty_read()
873 * -EOVERFLOW means we didn't have enough space in iterate_tty_read()
877 if (retval == -EOVERFLOW) in iterate_tty_read()
884 count -= copied; in iterate_tty_read()
887 * If the user copy failed, we still need to do another ->read() in iterate_tty_read()
894 retval = -EFAULT; in iterate_tty_read()
905 * tty_read - read method for tty device files
918 struct file *file = iocb->ki_filp; in tty_read()
925 return -EIO; in tty_read()
927 return -EIO; in tty_read()
935 ret = -EIO; in tty_read()
936 if (ld->ops->read) in tty_read()
948 mutex_unlock(&tty->atomic_write_lock); in tty_write_unlock()
949 wake_up_interruptible_poll(&tty->write_wait, EPOLLOUT); in tty_write_unlock()
954 if (!mutex_trylock(&tty->atomic_write_lock)) { in tty_write_lock()
956 return -EAGAIN; in tty_write_lock()
957 if (mutex_lock_interruptible(&tty->atomic_write_lock)) in tty_write_lock()
958 return -ERESTARTSYS; in tty_write_lock()
965 * denial-of-service type attacks
973 ret = tty_write_lock(tty, file->f_flags & O_NDELAY); in iterate_tty_write()
979 * simplifies low-level drivers immensely, since they in iterate_tty_write()
983 * big chunk-size.. in iterate_tty_write()
985 * The default chunk-size is 2kB, because the NTTY in iterate_tty_write()
991 if (test_bit(TTY_NO_WRITE_SPLIT, &tty->flags)) in iterate_tty_write()
997 if (tty->write_cnt < chunk) { in iterate_tty_write()
1005 ret = -ENOMEM; in iterate_tty_write()
1008 kvfree(tty->write_buf); in iterate_tty_write()
1009 tty->write_cnt = chunk; in iterate_tty_write()
1010 tty->write_buf = buf_chunk; in iterate_tty_write()
1017 ret = -EFAULT; in iterate_tty_write()
1018 if (copy_from_iter(tty->write_buf, size, from) != size) in iterate_tty_write()
1021 ret = ld->ops->write(tty, file, tty->write_buf, size); in iterate_tty_write()
1031 iov_iter_revert(from, size-ret); in iterate_tty_write()
1033 count -= ret; in iterate_tty_write()
1036 ret = -ERESTARTSYS; in iterate_tty_write()
1052 * tty_write_message - write a message to a certain tty, not just the console.
1067 mutex_lock(&tty->atomic_write_lock); in tty_write_message()
1069 if (tty->ops->write && tty->count > 0) in tty_write_message()
1070 tty->ops->write(tty, msg, strlen(msg)); in tty_write_message()
1084 return -EIO; in file_tty_write()
1085 if (!tty || !tty->ops->write || tty_io_error(tty)) in file_tty_write()
1086 return -EIO; in file_tty_write()
1088 if (tty->ops->write_room == NULL) in file_tty_write()
1093 if (!ld->ops->write) in file_tty_write()
1094 ret = -EIO; in file_tty_write()
1102 * tty_write - write method for tty device file
1117 return file_tty_write(iocb->ki_filp, iocb, from); in tty_write()
1144 * tty_send_xchar - send priority character
1154 bool was_stopped = tty->flow.stopped; in tty_send_xchar()
1156 if (tty->ops->send_xchar) { in tty_send_xchar()
1157 down_read(&tty->termios_rwsem); in tty_send_xchar()
1158 tty->ops->send_xchar(tty, ch); in tty_send_xchar()
1159 up_read(&tty->termios_rwsem); in tty_send_xchar()
1164 return -ERESTARTSYS; in tty_send_xchar()
1166 down_read(&tty->termios_rwsem); in tty_send_xchar()
1169 tty->ops->write(tty, &ch, 1); in tty_send_xchar()
1172 up_read(&tty->termios_rwsem); in tty_send_xchar()
1178 * pty_line_name - generate name for a pty
1191 int i = index + driver->name_base; in pty_line_name()
1192 /* ->name is initialized to "ttyp", but "tty" is expected */ in pty_line_name()
1194 driver->subtype == PTY_TYPE_SLAVE ? "tty" : driver->name, in pty_line_name()
1199 * tty_line_name - generate name for a tty
1211 if (driver->flags & TTY_DRIVER_UNNUMBERED_NODE) in tty_line_name()
1212 return sprintf(p, "%s", driver->name); in tty_line_name()
1214 return sprintf(p, "%s%d", driver->name, in tty_line_name()
1215 index + driver->name_base); in tty_line_name()
1219 * tty_driver_lookup_tty() - find an existing tty, if any
1234 if (driver->ops->lookup) { in tty_driver_lookup_tty()
1236 tty = ERR_PTR(-EIO); in tty_driver_lookup_tty()
1238 tty = driver->ops->lookup(driver, file, idx); in tty_driver_lookup_tty()
1240 if (idx >= driver->num) in tty_driver_lookup_tty()
1241 return ERR_PTR(-EINVAL); in tty_driver_lookup_tty()
1242 tty = driver->ttys[idx]; in tty_driver_lookup_tty()
1250 * tty_init_termios - helper for termios setup
1259 int idx = tty->index; in tty_init_termios()
1261 if (tty->driver->flags & TTY_DRIVER_RESET_TERMIOS) in tty_init_termios()
1262 tty->termios = tty->driver->init_termios; in tty_init_termios()
1265 tp = tty->driver->termios[idx]; in tty_init_termios()
1267 tty->termios = *tp; in tty_init_termios()
1268 tty->termios.c_line = tty->driver->init_termios.c_line; in tty_init_termios()
1270 tty->termios = tty->driver->init_termios; in tty_init_termios()
1273 tty->termios.c_ispeed = tty_termios_input_baud_rate(&tty->termios); in tty_init_termios()
1274 tty->termios.c_ospeed = tty_termios_baud_rate(&tty->termios); in tty_init_termios()
1279 * tty_standard_install - usual tty->ops->install
1283 * If the @driver overrides @tty->ops->install, it still can call this function
1290 tty->count++; in tty_standard_install()
1291 driver->ttys[tty->index] = tty; in tty_standard_install()
1297 * tty_driver_install_tty() - install a tty entry in the driver
1301 * Install a tty object into the driver tables. The @tty->index field will be
1310 return driver->ops->install ? driver->ops->install(driver, tty) : in tty_driver_install_tty()
1315 * tty_driver_remove_tty() - remove a tty from the driver tables
1319 * Remove a tty object from the driver tables. The tty->index field will be set
1326 if (driver->ops->remove) in tty_driver_remove_tty()
1327 driver->ops->remove(driver, tty); in tty_driver_remove_tty()
1329 driver->ttys[tty->index] = NULL; in tty_driver_remove_tty()
1333 * tty_reopen() - fast re-open of an open tty
1336 * Re-opens on master ptys are not allowed and return -%EIO.
1339 * Return: 0 on success, -errno on error.
1343 struct tty_driver *driver = tty->driver; in tty_reopen()
1347 if (driver->type == TTY_DRIVER_TYPE_PTY && in tty_reopen()
1348 driver->subtype == PTY_TYPE_MASTER) in tty_reopen()
1349 return -EIO; in tty_reopen()
1351 if (!tty->count) in tty_reopen()
1352 return -EAGAIN; in tty_reopen()
1354 if (test_bit(TTY_EXCLUSIVE, &tty->flags) && !capable(CAP_SYS_ADMIN)) in tty_reopen()
1355 return -EBUSY; in tty_reopen()
1365 if (!tty->ldisc) in tty_reopen()
1366 retval = tty_ldisc_reinit(tty, tty->termios.c_line); in tty_reopen()
1371 tty->count++; in tty_reopen()
1377 * tty_init_dev - initialise a tty device
1412 if (!try_module_get(driver->owner)) in tty_init_dev()
1413 return ERR_PTR(-ENODEV); in tty_init_dev()
1417 retval = -ENOMEM; in tty_init_dev()
1426 if (!tty->port) in tty_init_dev()
1427 tty->port = driver->ports[idx]; in tty_init_dev()
1429 if (WARN_RATELIMIT(!tty->port, in tty_init_dev()
1430 "%s: %s driver does not set tty->port. This would crash the kernel. Fix the driver!\n", in tty_init_dev()
1431 __func__, tty->driver->name)) { in tty_init_dev()
1432 retval = -EINVAL; in tty_init_dev()
1439 tty->port->itty = tty; in tty_init_dev()
1446 retval = tty_ldisc_setup(tty, tty->link); in tty_init_dev()
1457 module_put(driver->owner); in tty_init_dev()
1472 * tty_save_termios() - save tty termios data in driver table
1480 int idx = tty->index; in tty_save_termios()
1483 if (tty->driver->flags & TTY_DRIVER_RESET_TERMIOS) in tty_save_termios()
1487 tp = tty->driver->termios[idx]; in tty_save_termios()
1492 tty->driver->termios[idx] = tp; in tty_save_termios()
1494 *tp = tty->termios; in tty_save_termios()
1499 * tty_flush_works - flush all works of a tty/pty pair
1506 flush_work(&tty->SAK_work); in tty_flush_works()
1507 flush_work(&tty->hangup_work); in tty_flush_works()
1508 if (tty->link) { in tty_flush_works()
1509 flush_work(&tty->link->SAK_work); in tty_flush_works()
1510 flush_work(&tty->link->hangup_work); in tty_flush_works()
1515 * release_one_tty - release tty structure memory
1533 struct tty_driver *driver = tty->driver; in release_one_tty()
1534 struct module *owner = driver->owner; in release_one_tty()
1536 if (tty->ops->cleanup) in release_one_tty()
1537 tty->ops->cleanup(tty); in release_one_tty()
1542 spin_lock(&tty->files_lock); in release_one_tty()
1543 list_del_init(&tty->tty_files); in release_one_tty()
1544 spin_unlock(&tty->files_lock); in release_one_tty()
1546 put_pid(tty->ctrl.pgrp); in release_one_tty()
1547 put_pid(tty->ctrl.session); in release_one_tty()
1558 INIT_WORK(&tty->hangup_work, release_one_tty); in queue_release_one_tty()
1559 schedule_work(&tty->hangup_work); in queue_release_one_tty()
1563 * tty_kref_put - release a tty kref
1572 kref_put(&tty->kref, queue_release_one_tty); in tty_kref_put()
1577 * release_tty - release tty structure memory
1592 WARN_ON(tty->index != idx); in release_tty()
1594 if (tty->ops->shutdown) in release_tty()
1595 tty->ops->shutdown(tty); in release_tty()
1597 tty_driver_remove_tty(tty->driver, tty); in release_tty()
1598 if (tty->port) in release_tty()
1599 tty->port->itty = NULL; in release_tty()
1600 if (tty->link) in release_tty()
1601 tty->link->port->itty = NULL; in release_tty()
1602 if (tty->port) in release_tty()
1603 tty_buffer_cancel_work(tty->port); in release_tty()
1604 if (tty->link) in release_tty()
1605 tty_buffer_cancel_work(tty->link->port); in release_tty()
1607 tty_kref_put(tty->link); in release_tty()
1612 * tty_release_checks - check a tty before real release
1617 * no-op unless %TTY_PARANOIA_CHECK is defined.
1622 if (idx < 0 || idx >= tty->driver->num) { in tty_release_checks()
1624 return -1; in tty_release_checks()
1628 if (tty->driver->flags & TTY_DRIVER_DEVPTS_MEM) in tty_release_checks()
1631 if (tty != tty->driver->ttys[idx]) { in tty_release_checks()
1633 idx, tty->driver->ttys[idx]); in tty_release_checks()
1634 return -1; in tty_release_checks()
1636 if (tty->driver->other) { in tty_release_checks()
1637 struct tty_struct *o_tty = tty->link; in tty_release_checks()
1639 if (o_tty != tty->driver->other->ttys[idx]) { in tty_release_checks()
1641 idx, tty->driver->other->ttys[idx]); in tty_release_checks()
1642 return -1; in tty_release_checks()
1644 if (o_tty->link != tty) { in tty_release_checks()
1645 tty_debug(tty, "bad link = %p\n", o_tty->link); in tty_release_checks()
1646 return -1; in tty_release_checks()
1654 * tty_kclose - closes tty opened by tty_kopen
1659 * @tty->port.
1677 tty_port_set_kopened(tty->port, 0); in tty_kclose()
1678 release_tty(tty, tty->index); in tty_kclose()
1684 * tty_release_struct - release a tty struct
1713 * tty_release - vfs callback for close
1745 __tty_fasync(-1, filp, 0); in tty_release()
1747 idx = tty->index; in tty_release()
1748 if (tty->driver->type == TTY_DRIVER_TYPE_PTY && in tty_release()
1749 tty->driver->subtype == PTY_TYPE_MASTER) in tty_release()
1750 o_tty = tty->link; in tty_release()
1757 tty_debug_hangup(tty, "releasing (count=%d)\n", tty->count); in tty_release()
1759 if (tty->ops->close) in tty_release()
1760 tty->ops->close(tty, filp); in tty_release()
1766 * Sanity check: if tty->count is going to zero, there shouldn't be in tty_release()
1767 * any waiters on tty->read_wait or tty->write_wait. We test the in tty_release()
1781 if (tty->count <= 1) { in tty_release()
1782 if (waitqueue_active(&tty->read_wait)) { in tty_release()
1783 wake_up_poll(&tty->read_wait, EPOLLIN); in tty_release()
1786 if (waitqueue_active(&tty->write_wait)) { in tty_release()
1787 wake_up_poll(&tty->write_wait, EPOLLOUT); in tty_release()
1791 if (o_tty && o_tty->count <= 1) { in tty_release()
1792 if (waitqueue_active(&o_tty->read_wait)) { in tty_release()
1793 wake_up_poll(&o_tty->read_wait, EPOLLIN); in tty_release()
1796 if (waitqueue_active(&o_tty->write_wait)) { in tty_release()
1797 wake_up_poll(&o_tty->write_wait, EPOLLOUT); in tty_release()
1816 if (--o_tty->count < 0) { in tty_release()
1817 tty_warn(tty, "bad slave count (%d)\n", o_tty->count); in tty_release()
1818 o_tty->count = 0; in tty_release()
1821 if (--tty->count < 0) { in tty_release()
1822 tty_warn(tty, "bad tty->count (%d)\n", tty->count); in tty_release()
1823 tty->count = 0; in tty_release()
1827 * We've decremented tty->count, so we need to remove this file in tty_release()
1828 * descriptor off the tty->tty_files list; this serves two in tty_release()
1830 * - check_tty_count sees the correct number of file descriptors in tty_release()
1832 * - do_tty_hangup no longer sees this file descriptor as in tty_release()
1844 if (!tty->count) { in tty_release()
1846 session_clear_tty(tty->ctrl.session); in tty_release()
1848 session_clear_tty(o_tty->ctrl.session); in tty_release()
1853 final = !tty->count && !(o_tty && o_tty->count); in tty_release()
1858 /* At this point, the tty->count == 0 should ensure a dead tty in tty_release()
1859 * cannot be re-opened by a racing opener. in tty_release()
1872 * tty_open_current_tty - get locked tty of current task
1877 * Performs a re-open of the current task's controlling tty.
1892 return ERR_PTR(-ENXIO); in tty_open_current_tty()
1894 filp->f_flags |= O_NONBLOCK; /* Don't let /dev/tty block */ in tty_open_current_tty()
1908 * tty_lookup_driver - lookup a tty driver for a given device file
1942 filp->f_flags |= O_NONBLOCK; in tty_lookup_driver()
1948 return ERR_PTR(-ENODEV); in tty_lookup_driver()
1953 return ERR_PTR(-ENODEV); in tty_lookup_driver()
1963 int index = -1; in tty_kopen()
1980 tty = ERR_PTR(-EBUSY); in tty_kopen()
1985 tty_port_set_kopened(tty->port, 1); in tty_kopen()
1994 * tty_kopen_exclusive - open a tty device for kernel
1998 * it's not already opened and performs the first-time tty initialization.
2001 * * concurrent first-time tty initialization
2014 * tty_kopen_shared - open a tty device for shared in-kernel use
2017 * Opens an already existing tty for in-kernel use. Compared to
2029 * tty_open_by_driver - open a tty device
2034 * first-time tty initialization.
2038 * * concurrent first-time tty initialization
2042 * Return: the locked initialized or re-opened &tty_struct
2049 int index = -1; in tty_open_by_driver()
2067 if (tty_port_kopened(tty->port)) { in tty_open_by_driver()
2070 tty = ERR_PTR(-EBUSY); in tty_open_by_driver()
2077 if (retval == -EINTR) in tty_open_by_driver()
2078 retval = -ERESTARTSYS; in tty_open_by_driver()
2097 * tty_open - open a tty device
2102 * of opens done on a tty. We cannot use the inode-count, as different inodes
2105 * Open-counting is needed for pty masters, as well as for keeping track of
2107 * (This is not done solely through tty->count, now. - Ted 1/27/92)
2114 * * @tty->count should protect the rest.
2115 * * ->siglock protects ->signal/->sighand
2123 dev_t device = inode->i_rdev; in tty_open()
2124 unsigned saved_flags = filp->f_flags; in tty_open()
2131 return -ENOMEM; in tty_open()
2140 if (retval != -EAGAIN || signal_pending(current)) in tty_open()
2149 tty_debug_hangup(tty, "opening (count=%d)\n", tty->count); in tty_open()
2151 if (tty->ops->open) in tty_open()
2152 retval = tty->ops->open(tty, filp); in tty_open()
2154 retval = -ENODEV; in tty_open()
2155 filp->f_flags = saved_flags; in tty_open()
2162 if (retval != -ERESTARTSYS) in tty_open()
2173 filp->f_op = &tty_fops; in tty_open()
2176 clear_bit(TTY_HUPPED, &tty->flags); in tty_open()
2178 noctty = (filp->f_flags & O_NOCTTY) || in tty_open()
2181 (tty->driver->type == TTY_DRIVER_TYPE_PTY && in tty_open()
2182 tty->driver->subtype == PTY_TYPE_MASTER); in tty_open()
2191 * tty_poll - check tty status
2199 * re-entered freely by other callers.
2213 if (ld->ops->poll) in tty_poll()
2214 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
2628 flags = ss->flags & ASYNC_DEPRECATED; in tty_set_serial()
2634 if (!tty->ops->set_serial) in tty_set_serial()
2635 return -ENOTTY; in tty_set_serial()
2637 return tty->ops->set_serial(tty, ss); in tty_set_serial()
2640 static int tty_tiocsserial(struct tty_struct *tty, struct serial_struct __user *ss) in tty_tiocsserial() argument
2644 if (copy_from_user(&v, ss, sizeof(*ss))) in tty_tiocsserial()
2645 return -EFAULT; in tty_tiocsserial()
2650 static int tty_tiocgserial(struct tty_struct *tty, struct serial_struct __user *ss) in tty_tiocgserial() argument
2656 if (!tty->ops->get_serial) in tty_tiocgserial()
2657 return -ENOTTY; in tty_tiocgserial()
2658 err = tty->ops->get_serial(tty, &v); in tty_tiocgserial()
2659 if (!err && copy_to_user(ss, &v, sizeof(v))) in tty_tiocgserial()
2660 err = -EFAULT; in tty_tiocgserial()
2670 if (tty->driver->type == TTY_DRIVER_TYPE_PTY && in tty_pair_get_tty()
2671 tty->driver->subtype == PTY_TYPE_MASTER) in tty_pair_get_tty()
2672 tty = tty->link; in tty_pair_get_tty()
2688 return -EINVAL; in tty_ioctl()
2707 return -EINTR; in tty_ioctl()
2723 return real_tty != tty ? -EINVAL : tioccons(file); in tty_ioctl()
2725 set_bit(TTY_EXCLUSIVE, &tty->flags); in tty_ioctl()
2728 clear_bit(TTY_EXCLUSIVE, &tty->flags); in tty_ioctl()
2732 int excl = test_bit(TTY_EXCLUSIVE, &tty->flags); in tty_ioctl()
2742 return -EPERM; in tty_ioctl()
2755 if (tty->ops->break_ctl) in tty_ioctl()
2756 return tty->ops->break_ctl(tty, -1); in tty_ioctl()
2759 if (tty->ops->break_ctl) in tty_ioctl()
2760 return tty->ops->break_ctl(tty, 0); in tty_ioctl()
2762 case TCSBRK: /* SVID version: non-zero arg --> no break */ in tty_ioctl()
2763 /* non-zero arg means wait for all output data in tty_ioctl()
2799 if (retval != -ENOIOCTLCMD) in tty_ioctl()
2802 if (tty->ops->ioctl) { in tty_ioctl()
2803 retval = tty->ops->ioctl(tty, cmd, arg); in tty_ioctl()
2804 if (retval != -ENOIOCTLCMD) in tty_ioctl()
2810 retval = -EINVAL; in tty_ioctl()
2811 if (ld->ops->ioctl) { in tty_ioctl()
2812 retval = ld->ops->ioctl(tty, cmd, arg); in tty_ioctl()
2813 if (retval == -ENOIOCTLCMD) in tty_ioctl()
2814 retval = -ENOTTY; in tty_ioctl()
2845 struct serial_struct32 __user *ss) in compat_tty_tiocsserial() argument
2850 if (copy_from_user(&v32, ss, sizeof(*ss))) in compat_tty_tiocsserial()
2851 return -EFAULT; in compat_tty_tiocsserial()
2863 struct serial_struct32 __user *ss) in compat_tty_tiocgserial() argument
2872 if (!tty->ops->get_serial) in compat_tty_tiocgserial()
2873 return -ENOTTY; in compat_tty_tiocgserial()
2874 err = tty->ops->get_serial(tty, &v); in compat_tty_tiocgserial()
2881 if (copy_to_user(ss, &v32, sizeof(v32))) in compat_tty_tiocgserial()
2882 err = -EFAULT; in compat_tty_tiocgserial()
2891 int retval = -ENOIOCTLCMD; in tty_compat_ioctl()
2973 return -EINVAL; in tty_compat_ioctl()
2981 if (tty->ops->compat_ioctl) { in tty_compat_ioctl()
2982 retval = tty->ops->compat_ioctl(tty, cmd, arg); in tty_compat_ioctl()
2983 if (retval != -ENOIOCTLCMD) in tty_compat_ioctl()
2990 if (ld->ops->compat_ioctl) in tty_compat_ioctl()
2991 retval = ld->ops->compat_ioctl(tty, cmd, arg); in tty_compat_ioctl()
2992 if (retval == -ENOIOCTLCMD && ld->ops->ioctl) in tty_compat_ioctl()
2993 retval = ld->ops->ioctl(tty, (unsigned long)compat_ptr(cmd), in tty_compat_ioctl()
3003 if (likely(file->f_op->read_iter != tty_read)) in this_tty()
3009 * This implements the "Secure Attention Key" --- the idea is to
3012 * super-paranoid applications --- see the Orange Book for more details.
3020 * Now, if it would be correct ;-/ The current code has a nasty hole -
3025 * deadlock. We punt it up to process context. AKPM - 16Mar2001
3034 spin_lock_irqsave(&tty->ctrl.lock, flags); in __do_SAK()
3035 session = get_pid(tty->ctrl.session); in __do_SAK()
3036 spin_unlock_irqrestore(&tty->ctrl.lock, flags); in __do_SAK()
3046 task_pid_nr(p), p->comm); in __do_SAK()
3052 if (p->signal->tty == tty) { in __do_SAK()
3054 task_pid_nr(p), p->comm); in __do_SAK()
3060 i = iterate_fd(p->files, 0, this_tty, tty); in __do_SAK()
3063 task_pid_nr(p), p->comm, i - 1); in __do_SAK()
3081 * The tq handling here is a little racy - tty->SAK_work may already be queued.
3082 * Fortunately we don't need to worry, because if ->SAK_work is already queued,
3084 * already has. --akpm
3090 schedule_work(&tty->SAK_work); in do_SAK()
3104 * alloc_tty_struct - allocate a new tty
3110 * Locking: none - @tty in question is not exposed at this point
3120 kref_init(&tty->kref); in alloc_tty_struct()
3125 tty->ctrl.session = NULL; in alloc_tty_struct()
3126 tty->ctrl.pgrp = NULL; in alloc_tty_struct()
3127 mutex_init(&tty->legacy_mutex); in alloc_tty_struct()
3128 mutex_init(&tty->throttle_mutex); in alloc_tty_struct()
3129 init_rwsem(&tty->termios_rwsem); in alloc_tty_struct()
3130 mutex_init(&tty->winsize_mutex); in alloc_tty_struct()
3131 init_ldsem(&tty->ldisc_sem); in alloc_tty_struct()
3132 init_waitqueue_head(&tty->write_wait); in alloc_tty_struct()
3133 init_waitqueue_head(&tty->read_wait); in alloc_tty_struct()
3134 INIT_WORK(&tty->hangup_work, do_tty_hangup); in alloc_tty_struct()
3135 mutex_init(&tty->atomic_write_lock); in alloc_tty_struct()
3136 spin_lock_init(&tty->ctrl.lock); in alloc_tty_struct()
3137 spin_lock_init(&tty->flow.lock); in alloc_tty_struct()
3138 spin_lock_init(&tty->files_lock); in alloc_tty_struct()
3139 INIT_LIST_HEAD(&tty->tty_files); in alloc_tty_struct()
3140 INIT_WORK(&tty->SAK_work, do_SAK_work); in alloc_tty_struct()
3142 tty->driver = driver; in alloc_tty_struct()
3143 tty->ops = driver->ops; in alloc_tty_struct()
3144 tty->index = idx; in alloc_tty_struct()
3145 tty_line_name(driver, idx, tty->name); in alloc_tty_struct()
3146 tty->dev = tty_get_device(tty); in alloc_tty_struct()
3152 * tty_put_char - write one character to a tty
3156 * Write one byte to the @tty using the provided @tty->ops->put_char() method
3166 if (tty->ops->put_char) in tty_put_char()
3167 return tty->ops->put_char(tty, ch); in tty_put_char()
3168 return tty->ops->write(tty, &ch, 1); in tty_put_char()
3178 driver->cdevs[index] = cdev_alloc(); in tty_cdev_add()
3179 if (!driver->cdevs[index]) in tty_cdev_add()
3180 return -ENOMEM; in tty_cdev_add()
3181 driver->cdevs[index]->ops = &tty_fops; in tty_cdev_add()
3182 driver->cdevs[index]->owner = driver->owner; in tty_cdev_add()
3183 err = cdev_add(driver->cdevs[index], dev, count); in tty_cdev_add()
3185 kobject_put(&driver->cdevs[index]->kobj); in tty_cdev_add()
3190 * tty_register_device - register a tty device
3205 * ERR_PTR(-EFOO) on error).
3221 * tty_register_device_attr - register a tty device
3237 * ERR_PTR(-EFOO) on error).
3245 dev_t devt = MKDEV(driver->major, driver->minor_start) + index; in tty_register_device_attr()
3250 if (index >= driver->num) { in tty_register_device_attr()
3252 driver->name, index); in tty_register_device_attr()
3253 return ERR_PTR(-EINVAL); in tty_register_device_attr()
3256 if (driver->type == TTY_DRIVER_TYPE_PTY) in tty_register_device_attr()
3263 return ERR_PTR(-ENOMEM); in tty_register_device_attr()
3265 dev->devt = devt; in tty_register_device_attr()
3266 dev->class = &tty_class; in tty_register_device_attr()
3267 dev->parent = device; in tty_register_device_attr()
3268 dev->release = tty_device_create_release; in tty_register_device_attr()
3270 dev->groups = attr_grp; in tty_register_device_attr()
3279 if (!(driver->flags & TTY_DRIVER_DYNAMIC_ALLOC)) { in tty_register_device_attr()
3284 tp = driver->termios[index]; in tty_register_device_attr()
3286 driver->termios[index] = NULL; in tty_register_device_attr()
3296 kobject_uevent(&dev->kobj, KOBJ_ADD); in tty_register_device_attr()
3310 * tty_unregister_device - unregister a tty device
3321 device_destroy(&tty_class, MKDEV(driver->major, driver->minor_start) + index); in tty_unregister_device()
3322 if (!(driver->flags & TTY_DRIVER_DYNAMIC_ALLOC)) { in tty_unregister_device()
3323 cdev_del(driver->cdevs[index]); in tty_unregister_device()
3324 driver->cdevs[index] = NULL; in tty_unregister_device()
3330 * __tty_alloc_driver - allocate tty driver
3333 * @flags: some of %TTY_DRIVER_ flags, will be set in driver->flags
3346 return ERR_PTR(-EINVAL); in __tty_alloc_driver()
3350 return ERR_PTR(-ENOMEM); in __tty_alloc_driver()
3352 kref_init(&driver->kref); in __tty_alloc_driver()
3353 driver->num = lines; in __tty_alloc_driver()
3354 driver->owner = owner; in __tty_alloc_driver()
3355 driver->flags = flags; in __tty_alloc_driver()
3358 driver->ttys = kcalloc(lines, sizeof(*driver->ttys), in __tty_alloc_driver()
3360 driver->termios = kcalloc(lines, sizeof(*driver->termios), in __tty_alloc_driver()
3362 if (!driver->ttys || !driver->termios) { in __tty_alloc_driver()
3363 err = -ENOMEM; in __tty_alloc_driver()
3369 driver->ports = kcalloc(lines, sizeof(*driver->ports), in __tty_alloc_driver()
3371 if (!driver->ports) { in __tty_alloc_driver()
3372 err = -ENOMEM; in __tty_alloc_driver()
3378 driver->cdevs = kcalloc(cdevs, sizeof(*driver->cdevs), GFP_KERNEL); in __tty_alloc_driver()
3379 if (!driver->cdevs) { in __tty_alloc_driver()
3380 err = -ENOMEM; in __tty_alloc_driver()
3386 kfree(driver->ports); in __tty_alloc_driver()
3387 kfree(driver->ttys); in __tty_alloc_driver()
3388 kfree(driver->termios); in __tty_alloc_driver()
3389 kfree(driver->cdevs); in __tty_alloc_driver()
3401 if (driver->flags & TTY_DRIVER_INSTALLED) { in destruct_tty_driver()
3402 for (i = 0; i < driver->num; i++) { in destruct_tty_driver()
3403 tp = driver->termios[i]; in destruct_tty_driver()
3405 driver->termios[i] = NULL; in destruct_tty_driver()
3408 if (!(driver->flags & TTY_DRIVER_DYNAMIC_DEV)) in destruct_tty_driver()
3412 if (driver->flags & TTY_DRIVER_DYNAMIC_ALLOC) in destruct_tty_driver()
3413 cdev_del(driver->cdevs[0]); in destruct_tty_driver()
3415 kfree(driver->cdevs); in destruct_tty_driver()
3416 kfree(driver->ports); in destruct_tty_driver()
3417 kfree(driver->termios); in destruct_tty_driver()
3418 kfree(driver->ttys); in destruct_tty_driver()
3423 * tty_driver_kref_put - drop a reference to a tty driver
3430 kref_put(&driver->kref, destruct_tty_driver); in tty_driver_kref_put()
3435 * tty_register_driver - register a tty driver
3447 if (!driver->major) { in tty_register_driver()
3448 error = alloc_chrdev_region(&dev, driver->minor_start, in tty_register_driver()
3449 driver->num, driver->name); in tty_register_driver()
3451 driver->major = MAJOR(dev); in tty_register_driver()
3452 driver->minor_start = MINOR(dev); in tty_register_driver()
3455 dev = MKDEV(driver->major, driver->minor_start); in tty_register_driver()
3456 error = register_chrdev_region(dev, driver->num, driver->name); in tty_register_driver()
3461 if (driver->flags & TTY_DRIVER_DYNAMIC_ALLOC) { in tty_register_driver()
3462 error = tty_cdev_add(driver, dev, 0, driver->num); in tty_register_driver()
3468 list_add(&driver->tty_drivers, &tty_drivers); in tty_register_driver()
3471 if (!(driver->flags & TTY_DRIVER_DYNAMIC_DEV)) { in tty_register_driver()
3472 for (i = 0; i < driver->num; i++) { in tty_register_driver()
3481 driver->flags |= TTY_DRIVER_INSTALLED; in tty_register_driver()
3485 for (i--; i >= 0; i--) in tty_register_driver()
3489 list_del(&driver->tty_drivers); in tty_register_driver()
3493 unregister_chrdev_region(dev, driver->num); in tty_register_driver()
3500 * tty_unregister_driver - unregister a tty driver
3507 unregister_chrdev_region(MKDEV(driver->major, driver->minor_start), in tty_unregister_driver()
3508 driver->num); in tty_unregister_driver()
3510 list_del(&driver->tty_drivers); in tty_unregister_driver()
3517 return MKDEV(tty->driver->major, tty->driver->minor_start) + tty->index; in tty_devnum()
3530 if (dev->devt == MKDEV(TTYAUX_MAJOR, 0) || in tty_devnode()
3531 dev->devt == MKDEV(TTYAUX_MAJOR, 2)) in tty_devnode()
3563 * race-free reading of @flags. in show_cons_active()
3568 if (!c->device) in show_cons_active()
3570 if (!c->write) in show_cons_active()
3572 if ((c->flags & CON_ENABLED) == 0) in show_cons_active()
3585 while (i--) { in show_cons_active()
3586 int index = cs[i]->index; in show_cons_active()
3587 struct tty_driver *drv = cs[i]->device(cs[i], &index); in show_cons_active()
3590 if (drv && (cs[i]->index > 0 || drv->major != TTY_MAJOR)) in show_cons_active()
3594 cs[i]->name, cs[i]->index); in show_cons_active()
3618 sysfs_notify(&consdev->kobj, NULL, "active"); in console_sysfs_notify()