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>
136 /* This list gets poked at by procfs and various bits of boot up code. This
161 * free_tty_struct - free a disused tty
172 put_device(tty->dev); in free_tty_struct()
173 kfree(tty->write_buf); in free_tty_struct()
174 tty->magic = 0xDEADDEAD; in free_tty_struct()
180 return ((struct tty_file_private *)file->private_data)->tty; in file_tty()
189 return -ENOMEM; in tty_alloc_file()
191 file->private_data = priv; in tty_alloc_file()
199 struct tty_file_private *priv = file->private_data; in tty_add_file()
201 priv->tty = tty; in tty_add_file()
202 priv->file = file; in tty_add_file()
204 spin_lock(&tty->files_lock); in tty_add_file()
205 list_add(&priv->list, &tty->tty_files); in tty_add_file()
206 spin_unlock(&tty->files_lock); in tty_add_file()
210 * 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
249 return tty->name; in tty_name()
255 if (!tty || !tty->driver) in tty_driver_name()
257 return tty->driver->name; in tty_driver_name()
269 if (tty->magic != TTY_MAGIC) { in tty_paranoia_check()
285 spin_lock(&tty->files_lock); in check_tty_count()
286 list_for_each(p, &tty->tty_files) { in check_tty_count()
289 spin_unlock(&tty->files_lock); in check_tty_count()
290 if (tty->driver->type == TTY_DRIVER_TYPE_PTY && in check_tty_count()
291 tty->driver->subtype == PTY_TYPE_SLAVE && in check_tty_count()
292 tty->link && tty->link->count) in check_tty_count()
294 if (tty_port_kopened(tty->port)) in check_tty_count()
296 if (tty->count != (count + kopen_count)) { in check_tty_count()
297 tty_warn(tty, "%s: tty->count(%d) != (#fd's(%d) + #kopen's(%d))\n", in check_tty_count()
298 routine, tty->count, count, kopen_count); in check_tty_count()
306 * get_tty_driver - find device of a tty
321 dev_t base = MKDEV(p->major, p->minor_start); in get_tty_driver()
323 if (device < base || device >= base + p->num) in get_tty_driver()
325 *index = device - base; in get_tty_driver()
332 * tty_dev_name_to_number - return dev_t for device name
338 * the function returns -ENODEV.
355 return -EINVAL; in tty_dev_name_to_number()
361 prefix_length = str - name; in tty_dev_name_to_number()
365 if (prefix_length == strlen(p->name) && strncmp(name, in tty_dev_name_to_number()
366 p->name, prefix_length) == 0) { in tty_dev_name_to_number()
367 if (index < p->num) { in tty_dev_name_to_number()
368 *number = MKDEV(p->major, p->minor_start + index); in tty_dev_name_to_number()
374 ret = -ENODEV; in tty_dev_name_to_number()
384 * tty_find_polling_driver - find device of a polled tty
405 len = str - name; in tty_find_polling_driver()
411 if (!len || strncmp(name, p->name, len) != 0) in tty_find_polling_driver()
419 if (tty_line >= 0 && tty_line < p->num && p->ops && in tty_find_polling_driver()
420 p->ops->poll_init && !p->ops->poll_init(p, tty_line, stp)) { in tty_find_polling_driver()
440 return -EIO; in hung_up_tty_write()
443 /* No kernel lock held - none needed ;) */
452 return cmd == TIOCSPGRP ? -ENOTTY : -EIO; in hung_up_tty_ioctl()
458 return cmd == TIOCSPGRP ? -ENOTTY : -EIO; in hung_up_tty_compat_ioctl()
463 return -ENOTTY; in hung_up_tty_fasync()
470 if (tty && tty->ops && tty->ops->show_fdinfo) in tty_show_fdinfo()
471 tty->ops->show_fdinfo(tty, m); in tty_show_fdinfo()
518 * tty_wakeup - request more data
530 if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags)) { in tty_wakeup()
533 if (ld->ops->write_wakeup) in tty_wakeup()
534 ld->ops->write_wakeup(tty); in tty_wakeup()
538 wake_up_interruptible_poll(&tty->write_wait, EPOLLOUT); in tty_wakeup()
543 * tty_release_redirect - Release a redirect on a pty if present
564 * __tty_hangup - actual handler for hangup events
566 * @exit_session: if non-zero, signal all foreground group processes
584 * ->siglock to protect ->signal/->sighand
601 if (test_bit(TTY_HUPPED, &tty->flags)) { in __tty_hangup()
612 set_bit(TTY_HUPPING, &tty->flags); in __tty_hangup()
620 spin_lock(&tty->files_lock); in __tty_hangup()
622 list_for_each_entry(priv, &tty->tty_files, list) { in __tty_hangup()
623 filp = priv->file; in __tty_hangup()
624 if (filp->f_op->write_iter == redirected_tty_write) in __tty_hangup()
626 if (filp->f_op->write_iter != tty_write) in __tty_hangup()
629 __tty_fasync(-1, filp, 0); /* can't block */ in __tty_hangup()
630 filp->f_op = &hung_up_tty_fops; in __tty_hangup()
632 spin_unlock(&tty->files_lock); in __tty_hangup()
635 /* Account for the p->signal references we killed */ in __tty_hangup()
636 while (refs--) in __tty_hangup()
641 spin_lock_irq(&tty->ctrl.lock); in __tty_hangup()
642 clear_bit(TTY_THROTTLED, &tty->flags); in __tty_hangup()
643 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); in __tty_hangup()
644 put_pid(tty->ctrl.session); in __tty_hangup()
645 put_pid(tty->ctrl.pgrp); in __tty_hangup()
646 tty->ctrl.session = NULL; in __tty_hangup()
647 tty->ctrl.pgrp = NULL; in __tty_hangup()
648 tty->ctrl.pktstatus = 0; in __tty_hangup()
649 spin_unlock_irq(&tty->ctrl.lock); in __tty_hangup()
654 * tty->count and state->count to go out of sync. in __tty_hangup()
658 if (tty->ops->close) in __tty_hangup()
660 tty->ops->close(tty, cons_filp); in __tty_hangup()
661 } else if (tty->ops->hangup) in __tty_hangup()
662 tty->ops->hangup(tty); in __tty_hangup()
665 * we did here. The driver layer expects no calls after ->hangup() in __tty_hangup()
668 set_bit(TTY_HUPPED, &tty->flags); in __tty_hangup()
669 clear_bit(TTY_HUPPING, &tty->flags); in __tty_hangup()
685 * tty_hangup - trigger a hangup event
695 schedule_work(&tty->hangup_work); in tty_hangup()
700 * tty_vhangup - process vhangup
717 * tty_vhangup_self - process vhangup for own ctty
734 * tty_vhangup_session - hangup session leader exit
751 * tty_hung_up_p - was tty hung up
760 return (filp && filp->f_op == &hung_up_tty_fops); in tty_hung_up_p()
766 if (tty->flow.stopped) in __stop_tty()
768 tty->flow.stopped = true; in __stop_tty()
769 if (tty->ops->stop) in __stop_tty()
770 tty->ops->stop(tty); in __stop_tty()
774 * stop_tty - propagate flow control
778 * on an already stopped device and will not re-call the driver
793 spin_lock_irqsave(&tty->flow.lock, flags); in stop_tty()
795 spin_unlock_irqrestore(&tty->flow.lock, flags); in stop_tty()
801 if (!tty->flow.stopped || tty->flow.tco_stopped) in __start_tty()
803 tty->flow.stopped = false; in __start_tty()
804 if (tty->ops->start) in __start_tty()
805 tty->ops->start(tty); in __start_tty()
810 * start_tty - propagate flow control
824 spin_lock_irqsave(&tty->flow.lock, flags); in start_tty()
826 spin_unlock_irqrestore(&tty->flow.lock, flags); in start_tty()
836 * lower three bits (i.e every 8 seconds). If so, then we can update in tty_update_time()
840 if ((sec ^ time->tv_sec) & ~7) in tty_update_time()
841 time->tv_sec = sec; in tty_update_time()
845 * Iterate on the ldisc ->read() function until we've gotten all
868 size = ld->ops->read(tty, file, kernel_buf, size, &cookie, offset); in iterate_tty_read()
873 /* Did we have an earlier error (ie -EFAULT)? */ in iterate_tty_read()
879 * -EOVERFLOW means we didn't have enough space in iterate_tty_read()
883 if (retval == -EOVERFLOW) in iterate_tty_read()
890 count -= copied; in iterate_tty_read()
893 * If the user copy failed, we still need to do another ->read() in iterate_tty_read()
900 retval = -EFAULT; in iterate_tty_read()
911 * tty_read - read method for tty device files
926 struct file *file = iocb->ki_filp; in tty_read()
932 return -EIO; in tty_read()
934 return -EIO; in tty_read()
942 i = -EIO; in tty_read()
943 if (ld->ops->read) in tty_read()
948 tty_update_time(&inode->i_atime); in tty_read()
955 mutex_unlock(&tty->atomic_write_lock); in tty_write_unlock()
956 wake_up_interruptible_poll(&tty->write_wait, EPOLLOUT); in tty_write_unlock()
961 if (!mutex_trylock(&tty->atomic_write_lock)) { in tty_write_lock()
963 return -EAGAIN; in tty_write_lock()
964 if (mutex_lock_interruptible(&tty->atomic_write_lock)) in tty_write_lock()
965 return -ERESTARTSYS; in tty_write_lock()
972 * denial-of-service type attacks
984 ret = tty_write_lock(tty, file->f_flags & O_NDELAY); in do_tty_write()
990 * simplifies low-level drivers immensely, since they in do_tty_write()
994 * big chunk-size.. in do_tty_write()
996 * The default chunk-size is 2kB, because the NTTY in do_tty_write()
1005 if (test_bit(TTY_NO_WRITE_SPLIT, &tty->flags)) in do_tty_write()
1011 if (tty->write_cnt < chunk) { in do_tty_write()
1019 ret = -ENOMEM; in do_tty_write()
1022 kfree(tty->write_buf); in do_tty_write()
1023 tty->write_cnt = chunk; in do_tty_write()
1024 tty->write_buf = buf_chunk; in do_tty_write()
1034 ret = -EFAULT; in do_tty_write()
1035 if (copy_from_iter(tty->write_buf, size, from) != size) in do_tty_write()
1038 ret = write(tty, file, tty->write_buf, size); in do_tty_write()
1048 iov_iter_revert(from, size-ret); in do_tty_write()
1050 count -= ret; in do_tty_write()
1053 ret = -ERESTARTSYS; in do_tty_write()
1059 tty_update_time(&file_inode(file)->i_mtime); in do_tty_write()
1068 * tty_write_message - write a message to a certain tty, not just the console.
1082 mutex_lock(&tty->atomic_write_lock); in tty_write_message()
1084 if (tty->ops->write && tty->count > 0) in tty_write_message()
1085 tty->ops->write(tty, msg, strlen(msg)); in tty_write_message()
1098 return -EIO; in file_tty_write()
1099 if (!tty || !tty->ops->write || tty_io_error(tty)) in file_tty_write()
1100 return -EIO; in file_tty_write()
1102 if (tty->ops->write_room == NULL) in file_tty_write()
1107 if (!ld->ops->write) in file_tty_write()
1108 ret = -EIO; in file_tty_write()
1110 ret = do_tty_write(ld->ops->write, tty, file, from); in file_tty_write()
1116 * tty_write - write method for tty device file
1131 return file_tty_write(iocb->ki_filp, iocb, from); in tty_write()
1158 * tty_send_xchar - send priority character
1167 bool was_stopped = tty->flow.stopped; in tty_send_xchar()
1169 if (tty->ops->send_xchar) { in tty_send_xchar()
1170 down_read(&tty->termios_rwsem); in tty_send_xchar()
1171 tty->ops->send_xchar(tty, ch); in tty_send_xchar()
1172 up_read(&tty->termios_rwsem); in tty_send_xchar()
1177 return -ERESTARTSYS; in tty_send_xchar()
1179 down_read(&tty->termios_rwsem); in tty_send_xchar()
1182 tty->ops->write(tty, &ch, 1); in tty_send_xchar()
1185 up_read(&tty->termios_rwsem); in tty_send_xchar()
1191 * pty_line_name - generate name for a pty
1204 int i = index + driver->name_base; in pty_line_name()
1205 /* ->name is initialized to "ttyp", but "tty" is expected */ in pty_line_name()
1207 driver->subtype == PTY_TYPE_SLAVE ? "tty" : driver->name, in pty_line_name()
1212 * tty_line_name - generate name for a tty
1224 if (driver->flags & TTY_DRIVER_UNNUMBERED_NODE) in tty_line_name()
1225 return sprintf(p, "%s", driver->name); in tty_line_name()
1227 return sprintf(p, "%s%d", driver->name, in tty_line_name()
1228 index + driver->name_base); in tty_line_name()
1232 * tty_driver_lookup_tty() - find an existing tty, if any
1247 if (driver->ops->lookup) in tty_driver_lookup_tty()
1249 tty = ERR_PTR(-EIO); in tty_driver_lookup_tty()
1251 tty = driver->ops->lookup(driver, file, idx); in tty_driver_lookup_tty()
1253 tty = driver->ttys[idx]; in tty_driver_lookup_tty()
1261 * tty_init_termios - helper for termios setup
1271 int idx = tty->index; in tty_init_termios()
1273 if (tty->driver->flags & TTY_DRIVER_RESET_TERMIOS) in tty_init_termios()
1274 tty->termios = tty->driver->init_termios; in tty_init_termios()
1277 tp = tty->driver->termios[idx]; in tty_init_termios()
1279 tty->termios = *tp; in tty_init_termios()
1280 tty->termios.c_line = tty->driver->init_termios.c_line; in tty_init_termios()
1282 tty->termios = tty->driver->init_termios; in tty_init_termios()
1285 tty->termios.c_ispeed = tty_termios_input_baud_rate(&tty->termios); in tty_init_termios()
1286 tty->termios.c_ospeed = tty_termios_baud_rate(&tty->termios); in tty_init_termios()
1294 tty->count++; in tty_standard_install()
1295 driver->ttys[tty->index] = tty; in tty_standard_install()
1301 * tty_driver_install_tty() - install a tty entry in the driver
1305 * Install a tty object into the driver tables. The tty->index field
1315 return driver->ops->install ? driver->ops->install(driver, tty) : in tty_driver_install_tty()
1320 * tty_driver_remove_tty() - remove a tty from the driver tables
1324 * Remvoe a tty object from the driver tables. The tty->index field
1331 if (driver->ops->remove) in tty_driver_remove_tty()
1332 driver->ops->remove(driver, tty); in tty_driver_remove_tty()
1334 driver->ttys[tty->index] = NULL; in tty_driver_remove_tty()
1338 * tty_reopen() - fast re-open of an open tty
1341 * Return 0 on success, -errno on error.
1342 * Re-opens on master ptys are not allowed and return -EIO.
1348 struct tty_driver *driver = tty->driver; in tty_reopen()
1352 if (driver->type == TTY_DRIVER_TYPE_PTY && in tty_reopen()
1353 driver->subtype == PTY_TYPE_MASTER) in tty_reopen()
1354 return -EIO; in tty_reopen()
1356 if (!tty->count) in tty_reopen()
1357 return -EAGAIN; in tty_reopen()
1359 if (test_bit(TTY_EXCLUSIVE, &tty->flags) && !capable(CAP_SYS_ADMIN)) in tty_reopen()
1360 return -EBUSY; in tty_reopen()
1370 if (!tty->ldisc) in tty_reopen()
1371 retval = tty_ldisc_reinit(tty, tty->termios.c_line); in tty_reopen()
1376 tty->count++; in tty_reopen()
1382 * tty_init_dev - initialise a tty device
1419 if (!try_module_get(driver->owner)) in tty_init_dev()
1420 return ERR_PTR(-ENODEV); in tty_init_dev()
1424 retval = -ENOMEM; in tty_init_dev()
1433 if (!tty->port) in tty_init_dev()
1434 tty->port = driver->ports[idx]; in tty_init_dev()
1436 if (WARN_RATELIMIT(!tty->port, in tty_init_dev()
1437 "%s: %s driver does not set tty->port. This would crash the kernel. Fix the driver!\n", in tty_init_dev()
1438 __func__, tty->driver->name)) { in tty_init_dev()
1439 retval = -EINVAL; in tty_init_dev()
1446 tty->port->itty = tty; in tty_init_dev()
1453 retval = tty_ldisc_setup(tty, tty->link); in tty_init_dev()
1464 module_put(driver->owner); in tty_init_dev()
1479 * tty_save_termios() - save tty termios data in driver table
1487 int idx = tty->index; in tty_save_termios()
1490 if (tty->driver->flags & TTY_DRIVER_RESET_TERMIOS) in tty_save_termios()
1494 tp = tty->driver->termios[idx]; in tty_save_termios()
1499 tty->driver->termios[idx] = tp; in tty_save_termios()
1501 *tp = tty->termios; in tty_save_termios()
1506 * tty_flush_works - flush all works of a tty/pty pair
1513 flush_work(&tty->SAK_work); in tty_flush_works()
1514 flush_work(&tty->hangup_work); in tty_flush_works()
1515 if (tty->link) { in tty_flush_works()
1516 flush_work(&tty->link->SAK_work); in tty_flush_works()
1517 flush_work(&tty->link->hangup_work); in tty_flush_works()
1522 * release_one_tty - release tty structure memory
1540 struct tty_driver *driver = tty->driver; in release_one_tty()
1541 struct module *owner = driver->owner; in release_one_tty()
1543 if (tty->ops->cleanup) in release_one_tty()
1544 tty->ops->cleanup(tty); in release_one_tty()
1546 tty->magic = 0; in release_one_tty()
1550 spin_lock(&tty->files_lock); in release_one_tty()
1551 list_del_init(&tty->tty_files); in release_one_tty()
1552 spin_unlock(&tty->files_lock); in release_one_tty()
1554 put_pid(tty->ctrl.pgrp); in release_one_tty()
1555 put_pid(tty->ctrl.session); in release_one_tty()
1566 INIT_WORK(&tty->hangup_work, release_one_tty); in queue_release_one_tty()
1567 schedule_work(&tty->hangup_work); in queue_release_one_tty()
1571 * tty_kref_put - release a tty kref
1581 kref_put(&tty->kref, queue_release_one_tty); in tty_kref_put()
1586 * release_tty - release tty structure memory
1602 WARN_ON(tty->index != idx); in release_tty()
1604 if (tty->ops->shutdown) in release_tty()
1605 tty->ops->shutdown(tty); in release_tty()
1607 tty_driver_remove_tty(tty->driver, tty); in release_tty()
1608 if (tty->port) in release_tty()
1609 tty->port->itty = NULL; in release_tty()
1610 if (tty->link) in release_tty()
1611 tty->link->port->itty = NULL; in release_tty()
1612 if (tty->port) in release_tty()
1613 tty_buffer_cancel_work(tty->port); in release_tty()
1614 if (tty->link) in release_tty()
1615 tty_buffer_cancel_work(tty->link->port); in release_tty()
1617 tty_kref_put(tty->link); in release_tty()
1622 * tty_release_checks - check a tty before real release
1627 * This is a no-op unless TTY_PARANOIA_CHECK is defined.
1632 if (idx < 0 || idx >= tty->driver->num) { in tty_release_checks()
1634 return -1; in tty_release_checks()
1638 if (tty->driver->flags & TTY_DRIVER_DEVPTS_MEM) in tty_release_checks()
1641 if (tty != tty->driver->ttys[idx]) { in tty_release_checks()
1643 idx, tty->driver->ttys[idx]); in tty_release_checks()
1644 return -1; in tty_release_checks()
1646 if (tty->driver->other) { in tty_release_checks()
1647 struct tty_struct *o_tty = tty->link; in tty_release_checks()
1649 if (o_tty != tty->driver->other->ttys[idx]) { in tty_release_checks()
1651 idx, tty->driver->other->ttys[idx]); in tty_release_checks()
1652 return -1; in tty_release_checks()
1654 if (o_tty->link != tty) { in tty_release_checks()
1655 tty_debug(tty, "bad link = %p\n", o_tty->link); in tty_release_checks()
1656 return -1; in tty_release_checks()
1664 * tty_kclose - closes tty opened by tty_kopen
1669 * flag on tty->port.
1687 tty_port_set_kopened(tty->port, 0); in tty_kclose()
1688 release_tty(tty, tty->index); in tty_kclose()
1694 * tty_release_struct - release a tty struct
1723 * tty_release - vfs callback for close
1756 __tty_fasync(-1, filp, 0); in tty_release()
1758 idx = tty->index; in tty_release()
1759 if (tty->driver->type == TTY_DRIVER_TYPE_PTY && in tty_release()
1760 tty->driver->subtype == PTY_TYPE_MASTER) in tty_release()
1761 o_tty = tty->link; in tty_release()
1768 tty_debug_hangup(tty, "releasing (count=%d)\n", tty->count); in tty_release()
1770 if (tty->ops->close) in tty_release()
1771 tty->ops->close(tty, filp); in tty_release()
1777 * Sanity check: if tty->count is going to zero, there shouldn't be in tty_release()
1778 * any waiters on tty->read_wait or tty->write_wait. We test the in tty_release()
1792 if (tty->count <= 1) { in tty_release()
1793 if (waitqueue_active(&tty->read_wait)) { in tty_release()
1794 wake_up_poll(&tty->read_wait, EPOLLIN); in tty_release()
1797 if (waitqueue_active(&tty->write_wait)) { in tty_release()
1798 wake_up_poll(&tty->write_wait, EPOLLOUT); in tty_release()
1802 if (o_tty && o_tty->count <= 1) { in tty_release()
1803 if (waitqueue_active(&o_tty->read_wait)) { in tty_release()
1804 wake_up_poll(&o_tty->read_wait, EPOLLIN); in tty_release()
1807 if (waitqueue_active(&o_tty->write_wait)) { in tty_release()
1808 wake_up_poll(&o_tty->write_wait, EPOLLOUT); in tty_release()
1827 if (--o_tty->count < 0) { in tty_release()
1828 tty_warn(tty, "bad slave count (%d)\n", o_tty->count); in tty_release()
1829 o_tty->count = 0; in tty_release()
1832 if (--tty->count < 0) { in tty_release()
1833 tty_warn(tty, "bad tty->count (%d)\n", tty->count); in tty_release()
1834 tty->count = 0; in tty_release()
1838 * We've decremented tty->count, so we need to remove this file in tty_release()
1839 * descriptor off the tty->tty_files list; this serves two in tty_release()
1841 * - check_tty_count sees the correct number of file descriptors in tty_release()
1843 * - do_tty_hangup no longer sees this file descriptor as in tty_release()
1855 if (!tty->count) { in tty_release()
1857 session_clear_tty(tty->ctrl.session); in tty_release()
1859 session_clear_tty(o_tty->ctrl.session); in tty_release()
1864 final = !tty->count && !(o_tty && o_tty->count); in tty_release()
1869 /* At this point, the tty->count == 0 should ensure a dead tty in tty_release()
1870 * cannot be re-opened by a racing opener. in tty_release()
1883 * tty_open_current_tty - get locked tty of current task
1888 * Performs a re-open of the current task's controlling tty.
1903 return ERR_PTR(-ENXIO); in tty_open_current_tty()
1905 filp->f_flags |= O_NONBLOCK; /* Don't let /dev/tty block */ in tty_open_current_tty()
1919 * tty_lookup_driver - lookup a tty driver for a given device file
1952 filp->f_flags |= O_NONBLOCK; in tty_lookup_driver()
1958 return ERR_PTR(-ENODEV); in tty_lookup_driver()
1963 return ERR_PTR(-ENODEV); in tty_lookup_driver()
1973 int index = -1; in tty_kopen()
1990 tty = ERR_PTR(-EBUSY); in tty_kopen()
1995 tty_port_set_kopened(tty->port, 1); in tty_kopen()
2004 * tty_kopen_exclusive - open a tty device for kernel
2008 * makes sure it's not already opened and performs the first-time
2014 * - concurrent first-time tty initialization
2015 * - concurrent tty driver removal w/ lookup
2016 * - concurrent tty removal from driver table
2025 * tty_kopen_shared - open a tty device for shared in-kernel use
2028 * Opens an already existing tty for in-kernel use. Compared to
2040 * tty_open_by_driver - open a tty device
2045 * performs the first-time tty initialization.
2047 * Returns the locked initialized or re-opened &tty_struct
2050 * - concurrent first-time tty initialization
2051 * - concurrent tty driver removal w/ lookup
2052 * - concurrent tty removal from driver table
2059 int index = -1; in tty_open_by_driver()
2077 if (tty_port_kopened(tty->port)) { in tty_open_by_driver()
2080 tty = ERR_PTR(-EBUSY); in tty_open_by_driver()
2087 if (retval == -EINTR) in tty_open_by_driver()
2088 retval = -ERESTARTSYS; in tty_open_by_driver()
2107 * tty_open - open a tty device
2112 * number of opens done on a tty. We cannot use the inode-count, as
2115 * Open-counting is needed for pty masters, as well as for keeping
2117 * (This is not done solely through tty->count, now. - Ted 1/27/92)
2123 * tty->count should protect the rest.
2124 * ->siglock protects ->signal/->sighand
2134 dev_t device = inode->i_rdev; in tty_open()
2135 unsigned saved_flags = filp->f_flags; in tty_open()
2142 return -ENOMEM; in tty_open()
2151 if (retval != -EAGAIN || signal_pending(current)) in tty_open()
2160 tty_debug_hangup(tty, "opening (count=%d)\n", tty->count); in tty_open()
2162 if (tty->ops->open) in tty_open()
2163 retval = tty->ops->open(tty, filp); in tty_open()
2165 retval = -ENODEV; in tty_open()
2166 filp->f_flags = saved_flags; in tty_open()
2173 if (retval != -ERESTARTSYS) in tty_open()
2184 filp->f_op = &tty_fops; in tty_open()
2187 clear_bit(TTY_HUPPED, &tty->flags); in tty_open()
2189 noctty = (filp->f_flags & O_NOCTTY) || in tty_open()
2192 (tty->driver->type == TTY_DRIVER_TYPE_PTY && in tty_open()
2193 tty->driver->subtype == PTY_TYPE_MASTER); in tty_open()
2203 * tty_poll - check tty status
2211 * may be re-entered freely by other callers.
2226 if (ld->ops->poll) in tty_poll()
2227 ret = ld->ops->poll(tty, filp, wait); in tty_poll()
2241 retval = fasync_helper(fd, filp, on, &tty->fasync); in __tty_fasync()
2249 spin_lock_irqsave(&tty->ctrl.lock, flags); in __tty_fasync()
2250 if (tty->ctrl.pgrp) { in __tty_fasync()
2251 pid = tty->ctrl.pgrp; in __tty_fasync()
2258 spin_unlock_irqrestore(&tty->ctrl.lock, flags); in __tty_fasync()
2270 int retval = -ENOTTY; in tty_fasync()
2281 * tiocsti - fake input character
2292 * current->signal->tty check is safe without locks
2300 if ((current->signal->tty != tty) && !capable(CAP_SYS_ADMIN)) in tiocsti()
2301 return -EPERM; in tiocsti()
2303 return -EFAULT; in tiocsti()
2307 return -EIO; in tiocsti()
2308 tty_buffer_lock_exclusive(tty->port); in tiocsti()
2309 if (ld->ops->receive_buf) in tiocsti()
2310 ld->ops->receive_buf(tty, &ch, &mbz, 1); in tiocsti()
2311 tty_buffer_unlock_exclusive(tty->port); in tiocsti()
2317 * tiocgwinsz - implement window query ioctl
2323 * Locking: tty->winsize_mutex is taken to ensure the winsize data
2331 mutex_lock(&tty->winsize_mutex); in tiocgwinsz()
2332 err = copy_to_user(arg, &tty->winsize, sizeof(*arg)); in tiocgwinsz()
2333 mutex_unlock(&tty->winsize_mutex); in tiocgwinsz()
2335 return err ? -EFAULT : 0; in tiocgwinsz()
2339 * tty_do_resize - resize event
2352 mutex_lock(&tty->winsize_mutex); in tty_do_resize()
2353 if (!memcmp(ws, &tty->winsize, sizeof(*ws))) in tty_do_resize()
2362 tty->winsize = *ws; in tty_do_resize()
2364 mutex_unlock(&tty->winsize_mutex); in tty_do_resize()
2370 * tiocswinsz - implement window size set ioctl
2389 return -EFAULT; in tiocswinsz()
2391 if (tty->ops->resize) in tiocswinsz()
2392 return tty->ops->resize(tty, &tmp_ws); in tiocswinsz()
2398 * tioccons - allow admin to move logical console
2409 return -EPERM; in tioccons()
2410 if (file->f_op->write_iter == redirected_tty_write) { in tioccons()
2421 if (file->f_op->write_iter != tty_write) in tioccons()
2422 return -ENOTTY; in tioccons()
2423 if (!(file->f_mode & FMODE_WRITE)) in tioccons()
2424 return -EBADF; in tioccons()
2425 if (!(file->f_mode & FMODE_CAN_WRITE)) in tioccons()
2426 return -EINVAL; in tioccons()
2430 return -EBUSY; in tioccons()
2438 * tiocsetd - set line discipline
2453 return -EFAULT; in tiocsetd()
2461 * tiocgetd - get line discipline
2478 return -EIO; in tiocgetd()
2479 ret = put_user(ld->ops->num, p); in tiocgetd()
2485 * send_break - performed time break
2501 if (tty->ops->break_ctl == NULL) in send_break()
2504 if (tty->driver->flags & TTY_DRIVER_HARDWARE_BREAK) in send_break()
2505 retval = tty->ops->break_ctl(tty, duration); in send_break()
2509 return -EINTR; in send_break()
2510 retval = tty->ops->break_ctl(tty, -1); in send_break()
2515 retval = tty->ops->break_ctl(tty, 0); in send_break()
2519 retval = -EINTR; in send_break()
2525 * tty_tiocmget - get modem status
2529 * Obtain the modem status bits from the tty driver if the feature
2530 * is supported. Return -ENOTTY if it is not available.
2537 int retval = -ENOTTY; in tty_tiocmget()
2539 if (tty->ops->tiocmget) { in tty_tiocmget()
2540 retval = tty->ops->tiocmget(tty); in tty_tiocmget()
2549 * tty_tiocmset - set modem status
2551 * @cmd: command - clear bits, set bits or set all
2552 * @p: pointer to desired bits
2554 * Set the modem status bits from the tty driver if the feature
2555 * is supported. Return -ENOTTY if it is not available.
2566 if (tty->ops->tiocmset == NULL) in tty_tiocmset()
2567 return -ENOTTY; in tty_tiocmset()
2587 return tty->ops->tiocmset(tty, set, clear); in tty_tiocmset()
2591 * tty_get_icount - get tty statistics
2604 if (tty->ops->get_icount) in tty_get_icount()
2605 return tty->ops->get_icount(tty, icount); in tty_get_icount()
2607 return -ENOTTY; in tty_get_icount()
2621 return -EFAULT; in tty_tiocgicount()
2625 static int tty_set_serial(struct tty_struct *tty, struct serial_struct *ss) in tty_set_serial() argument
2630 flags = ss->flags & ASYNC_DEPRECATED; in tty_set_serial()
2636 if (!tty->ops->set_serial) in tty_set_serial()
2637 return -ENOTTY; in tty_set_serial()
2639 return tty->ops->set_serial(tty, ss); in tty_set_serial()
2642 static int tty_tiocsserial(struct tty_struct *tty, struct serial_struct __user *ss) in tty_tiocsserial() argument
2646 if (copy_from_user(&v, ss, sizeof(*ss))) in tty_tiocsserial()
2647 return -EFAULT; in tty_tiocsserial()
2652 static int tty_tiocgserial(struct tty_struct *tty, struct serial_struct __user *ss) in tty_tiocgserial() argument
2658 if (!tty->ops->get_serial) in tty_tiocgserial()
2659 return -ENOTTY; in tty_tiocgserial()
2660 err = tty->ops->get_serial(tty, &v); in tty_tiocgserial()
2661 if (!err && copy_to_user(ss, &v, sizeof(v))) in tty_tiocgserial()
2662 err = -EFAULT; in tty_tiocgserial()
2672 if (tty->driver->type == TTY_DRIVER_TYPE_PTY && in tty_pair_get_tty()
2673 tty->driver->subtype == PTY_TYPE_MASTER) in tty_pair_get_tty()
2674 tty = tty->link; in tty_pair_get_tty()
2690 return -EINVAL; in tty_ioctl()
2709 return -EINTR; in tty_ioctl()
2725 return real_tty != tty ? -EINVAL : tioccons(file); in tty_ioctl()
2727 set_bit(TTY_EXCLUSIVE, &tty->flags); in tty_ioctl()
2730 clear_bit(TTY_EXCLUSIVE, &tty->flags); in tty_ioctl()
2734 int excl = test_bit(TTY_EXCLUSIVE, &tty->flags); in tty_ioctl()
2744 return -EPERM; in tty_ioctl()
2757 if (tty->ops->break_ctl) in tty_ioctl()
2758 return tty->ops->break_ctl(tty, -1); in tty_ioctl()
2761 if (tty->ops->break_ctl) in tty_ioctl()
2762 return tty->ops->break_ctl(tty, 0); in tty_ioctl()
2764 case TCSBRK: /* SVID version: non-zero arg --> no break */ in tty_ioctl()
2765 /* non-zero arg means wait for all output data in tty_ioctl()
2801 if (retval != -ENOIOCTLCMD) in tty_ioctl()
2804 if (tty->ops->ioctl) { in tty_ioctl()
2805 retval = tty->ops->ioctl(tty, cmd, arg); in tty_ioctl()
2806 if (retval != -ENOIOCTLCMD) in tty_ioctl()
2812 retval = -EINVAL; in tty_ioctl()
2813 if (ld->ops->ioctl) { in tty_ioctl()
2814 retval = ld->ops->ioctl(tty, file, cmd, arg); in tty_ioctl()
2815 if (retval == -ENOIOCTLCMD) in tty_ioctl()
2816 retval = -ENOTTY; in tty_ioctl()
2847 struct serial_struct32 __user *ss) in compat_tty_tiocsserial() argument
2852 if (copy_from_user(&v32, ss, sizeof(*ss))) in compat_tty_tiocsserial()
2853 return -EFAULT; in compat_tty_tiocsserial()
2865 struct serial_struct32 __user *ss) in compat_tty_tiocgserial() argument
2874 if (!tty->ops->get_serial) in compat_tty_tiocgserial()
2875 return -ENOTTY; in compat_tty_tiocgserial()
2876 err = tty->ops->get_serial(tty, &v); in compat_tty_tiocgserial()
2883 if (copy_to_user(ss, &v32, sizeof(v32))) in compat_tty_tiocgserial()
2884 err = -EFAULT; in compat_tty_tiocgserial()
2893 int retval = -ENOIOCTLCMD; in tty_compat_ioctl()
2975 return -EINVAL; in tty_compat_ioctl()
2983 if (tty->ops->compat_ioctl) { in tty_compat_ioctl()
2984 retval = tty->ops->compat_ioctl(tty, cmd, arg); in tty_compat_ioctl()
2985 if (retval != -ENOIOCTLCMD) in tty_compat_ioctl()
2992 if (ld->ops->compat_ioctl) in tty_compat_ioctl()
2993 retval = ld->ops->compat_ioctl(tty, file, cmd, arg); in tty_compat_ioctl()
2994 if (retval == -ENOIOCTLCMD && ld->ops->ioctl) in tty_compat_ioctl()
2995 retval = ld->ops->ioctl(tty, file, in tty_compat_ioctl()
3005 if (likely(file->f_op->read_iter != tty_read)) in this_tty()
3011 * This implements the "Secure Attention Key" --- the idea is to
3014 * super-paranoid applications --- see the Orange Book for more details.
3022 * Now, if it would be correct ;-/ The current code has a nasty hole -
3027 * deadlock. We punt it up to process context. AKPM - 16Mar2001
3042 spin_lock_irqsave(&tty->ctrl.lock, flags); in __do_SAK()
3043 session = get_pid(tty->ctrl.session); in __do_SAK()
3044 spin_unlock_irqrestore(&tty->ctrl.lock, flags); in __do_SAK()
3054 task_pid_nr(p), p->comm); in __do_SAK()
3060 if (p->signal->tty == tty) { in __do_SAK()
3062 task_pid_nr(p), p->comm); in __do_SAK()
3067 i = iterate_fd(p->files, 0, this_tty, tty); in __do_SAK()
3070 task_pid_nr(p), p->comm, i - 1); in __do_SAK()
3088 * The tq handling here is a little racy - tty->SAK_work may already be queued.
3089 * Fortunately we don't need to worry, because if ->SAK_work is already queued,
3091 * already has. --akpm
3097 schedule_work(&tty->SAK_work); in do_SAK()
3115 * Locking: none - tty in question is not exposed at this point
3126 kref_init(&tty->kref); in alloc_tty_struct()
3127 tty->magic = TTY_MAGIC; in alloc_tty_struct()
3132 tty->ctrl.session = NULL; in alloc_tty_struct()
3133 tty->ctrl.pgrp = NULL; in alloc_tty_struct()
3134 mutex_init(&tty->legacy_mutex); in alloc_tty_struct()
3135 mutex_init(&tty->throttle_mutex); in alloc_tty_struct()
3136 init_rwsem(&tty->termios_rwsem); in alloc_tty_struct()
3137 mutex_init(&tty->winsize_mutex); in alloc_tty_struct()
3138 init_ldsem(&tty->ldisc_sem); in alloc_tty_struct()
3139 init_waitqueue_head(&tty->write_wait); in alloc_tty_struct()
3140 init_waitqueue_head(&tty->read_wait); in alloc_tty_struct()
3141 INIT_WORK(&tty->hangup_work, do_tty_hangup); in alloc_tty_struct()
3142 mutex_init(&tty->atomic_write_lock); in alloc_tty_struct()
3143 spin_lock_init(&tty->ctrl.lock); in alloc_tty_struct()
3144 spin_lock_init(&tty->flow.lock); in alloc_tty_struct()
3145 spin_lock_init(&tty->files_lock); in alloc_tty_struct()
3146 INIT_LIST_HEAD(&tty->tty_files); in alloc_tty_struct()
3147 INIT_WORK(&tty->SAK_work, do_SAK_work); in alloc_tty_struct()
3149 tty->driver = driver; in alloc_tty_struct()
3150 tty->ops = driver->ops; in alloc_tty_struct()
3151 tty->index = idx; in alloc_tty_struct()
3152 tty_line_name(driver, idx, tty->name); in alloc_tty_struct()
3153 tty->dev = tty_get_device(tty); in alloc_tty_struct()
3159 * tty_put_char - write one character to a tty
3172 if (tty->ops->put_char) in tty_put_char()
3173 return tty->ops->put_char(tty, ch); in tty_put_char()
3174 return tty->ops->write(tty, &ch, 1); in tty_put_char()
3186 driver->cdevs[index] = cdev_alloc(); in tty_cdev_add()
3187 if (!driver->cdevs[index]) in tty_cdev_add()
3188 return -ENOMEM; in tty_cdev_add()
3189 driver->cdevs[index]->ops = &tty_fops; in tty_cdev_add()
3190 driver->cdevs[index]->owner = driver->owner; in tty_cdev_add()
3191 err = cdev_add(driver->cdevs[index], dev, count); in tty_cdev_add()
3193 kobject_put(&driver->cdevs[index]->kobj); in tty_cdev_add()
3198 * tty_register_device - register a tty device
3206 * (or ERR_PTR(-EFOO) on error).
3230 * tty_register_device_attr - register a tty device
3240 * (or ERR_PTR(-EFOO) on error).
3255 dev_t devt = MKDEV(driver->major, driver->minor_start) + index; in tty_register_device_attr()
3260 if (index >= driver->num) { in tty_register_device_attr()
3262 driver->name, index); in tty_register_device_attr()
3263 return ERR_PTR(-EINVAL); in tty_register_device_attr()
3266 if (driver->type == TTY_DRIVER_TYPE_PTY) in tty_register_device_attr()
3273 return ERR_PTR(-ENOMEM); in tty_register_device_attr()
3275 dev->devt = devt; in tty_register_device_attr()
3276 dev->class = tty_class; in tty_register_device_attr()
3277 dev->parent = device; in tty_register_device_attr()
3278 dev->release = tty_device_create_release; in tty_register_device_attr()
3280 dev->groups = attr_grp; in tty_register_device_attr()
3289 if (!(driver->flags & TTY_DRIVER_DYNAMIC_ALLOC)) { in tty_register_device_attr()
3294 tp = driver->termios[index]; in tty_register_device_attr()
3296 driver->termios[index] = NULL; in tty_register_device_attr()
3306 kobject_uevent(&dev->kobj, KOBJ_ADD); in tty_register_device_attr()
3320 * tty_unregister_device - unregister a tty device
3333 MKDEV(driver->major, driver->minor_start) + index); in tty_unregister_device()
3334 if (!(driver->flags & TTY_DRIVER_DYNAMIC_ALLOC)) { in tty_unregister_device()
3335 cdev_del(driver->cdevs[index]); in tty_unregister_device()
3336 driver->cdevs[index] = NULL; in tty_unregister_device()
3342 * __tty_alloc_driver -- allocate tty driver
3345 * @flags: some of TTY_DRIVER_* flags, will be set in driver->flags
3358 return ERR_PTR(-EINVAL); in __tty_alloc_driver()
3362 return ERR_PTR(-ENOMEM); in __tty_alloc_driver()
3364 kref_init(&driver->kref); in __tty_alloc_driver()
3365 driver->magic = TTY_DRIVER_MAGIC; in __tty_alloc_driver()
3366 driver->num = lines; in __tty_alloc_driver()
3367 driver->owner = owner; in __tty_alloc_driver()
3368 driver->flags = flags; in __tty_alloc_driver()
3371 driver->ttys = kcalloc(lines, sizeof(*driver->ttys), in __tty_alloc_driver()
3373 driver->termios = kcalloc(lines, sizeof(*driver->termios), in __tty_alloc_driver()
3375 if (!driver->ttys || !driver->termios) { in __tty_alloc_driver()
3376 err = -ENOMEM; in __tty_alloc_driver()
3382 driver->ports = kcalloc(lines, sizeof(*driver->ports), in __tty_alloc_driver()
3384 if (!driver->ports) { in __tty_alloc_driver()
3385 err = -ENOMEM; in __tty_alloc_driver()
3391 driver->cdevs = kcalloc(cdevs, sizeof(*driver->cdevs), GFP_KERNEL); in __tty_alloc_driver()
3392 if (!driver->cdevs) { in __tty_alloc_driver()
3393 err = -ENOMEM; in __tty_alloc_driver()
3399 kfree(driver->ports); in __tty_alloc_driver()
3400 kfree(driver->ttys); in __tty_alloc_driver()
3401 kfree(driver->termios); in __tty_alloc_driver()
3402 kfree(driver->cdevs); in __tty_alloc_driver()
3414 if (driver->flags & TTY_DRIVER_INSTALLED) { in destruct_tty_driver()
3415 for (i = 0; i < driver->num; i++) { in destruct_tty_driver()
3416 tp = driver->termios[i]; in destruct_tty_driver()
3418 driver->termios[i] = NULL; in destruct_tty_driver()
3421 if (!(driver->flags & TTY_DRIVER_DYNAMIC_DEV)) in destruct_tty_driver()
3425 if (driver->flags & TTY_DRIVER_DYNAMIC_ALLOC) in destruct_tty_driver()
3426 cdev_del(driver->cdevs[0]); in destruct_tty_driver()
3428 kfree(driver->cdevs); in destruct_tty_driver()
3429 kfree(driver->ports); in destruct_tty_driver()
3430 kfree(driver->termios); in destruct_tty_driver()
3431 kfree(driver->ttys); in destruct_tty_driver()
3437 kref_put(&driver->kref, destruct_tty_driver); in tty_driver_kref_put()
3451 if (!driver->major) { in tty_register_driver()
3452 error = alloc_chrdev_region(&dev, driver->minor_start, in tty_register_driver()
3453 driver->num, driver->name); in tty_register_driver()
3455 driver->major = MAJOR(dev); in tty_register_driver()
3456 driver->minor_start = MINOR(dev); in tty_register_driver()
3459 dev = MKDEV(driver->major, driver->minor_start); in tty_register_driver()
3460 error = register_chrdev_region(dev, driver->num, driver->name); in tty_register_driver()
3465 if (driver->flags & TTY_DRIVER_DYNAMIC_ALLOC) { in tty_register_driver()
3466 error = tty_cdev_add(driver, dev, 0, driver->num); in tty_register_driver()
3472 list_add(&driver->tty_drivers, &tty_drivers); in tty_register_driver()
3475 if (!(driver->flags & TTY_DRIVER_DYNAMIC_DEV)) { in tty_register_driver()
3476 for (i = 0; i < driver->num; i++) { in tty_register_driver()
3485 driver->flags |= TTY_DRIVER_INSTALLED; in tty_register_driver()
3489 for (i--; i >= 0; i--) in tty_register_driver()
3493 list_del(&driver->tty_drivers); in tty_register_driver()
3497 unregister_chrdev_region(dev, driver->num); in tty_register_driver()
3508 unregister_chrdev_region(MKDEV(driver->major, driver->minor_start), in tty_unregister_driver()
3509 driver->num); in tty_unregister_driver()
3511 list_del(&driver->tty_drivers); in tty_unregister_driver()
3518 return MKDEV(tty->driver->major, tty->driver->minor_start) + tty->index; in tty_devnum()
3531 if (dev->devt == MKDEV(TTYAUX_MAJOR, 0) || in tty_devnode()
3532 dev->devt == MKDEV(TTYAUX_MAJOR, 2)) in tty_devnode()
3542 tty_class->devnode = tty_devnode; in tty_class_init()
3561 if (!c->device) in show_cons_active()
3563 if (!c->write) in show_cons_active()
3565 if ((c->flags & CON_ENABLED) == 0) in show_cons_active()
3571 while (i--) { in show_cons_active()
3572 int index = cs[i]->index; in show_cons_active()
3573 struct tty_driver *drv = cs[i]->device(cs[i], &index); in show_cons_active()
3576 if (drv && (cs[i]->index > 0 || drv->major != TTY_MAJOR)) in show_cons_active()
3580 cs[i]->name, cs[i]->index); in show_cons_active()
3602 sysfs_notify(&consdev->kobj, NULL, "active"); in console_sysfs_notify()