2 * Copyright (C) 1991, 1992 Linus Torvalds
4 * Added support for a Unix98-style ptmx device.
5 * -- C. Scott Ananian <cananian@alumni.princeton.edu>, 14-Jan-1998
9 #include <linux/module.h>
11 #include <linux/errno.h>
12 #include <linux/interrupt.h>
13 #include <linux/tty.h>
14 #include <linux/tty_flip.h>
15 #include <linux/fcntl.h>
16 #include <linux/sched.h>
17 #include <linux/string.h>
18 #include <linux/major.h>
20 #include <linux/init.h>
21 #include <linux/device.h>
22 #include <linux/uaccess.h>
23 #include <linux/bitops.h>
24 #include <linux/devpts_fs.h>
25 #include <linux/slab.h>
26 #include <linux/mutex.h>
27 #include <linux/poll.h>
30 #ifdef CONFIG_UNIX98_PTYS
31 static struct tty_driver
*ptm_driver
;
32 static struct tty_driver
*pts_driver
;
33 static DEFINE_MUTEX(devpts_mutex
);
36 static void pty_close(struct tty_struct
*tty
, struct file
*filp
)
39 if (tty
->driver
->subtype
== PTY_TYPE_MASTER
)
40 WARN_ON(tty
->count
> 1);
42 if (test_bit(TTY_IO_ERROR
, &tty
->flags
))
47 set_bit(TTY_IO_ERROR
, &tty
->flags
);
48 wake_up_interruptible(&tty
->read_wait
);
49 wake_up_interruptible(&tty
->write_wait
);
51 /* Review - krefs on tty_link ?? */
54 set_bit(TTY_OTHER_CLOSED
, &tty
->link
->flags
);
55 wake_up_interruptible(&tty
->link
->read_wait
);
56 wake_up_interruptible(&tty
->link
->write_wait
);
57 if (tty
->driver
->subtype
== PTY_TYPE_MASTER
) {
58 set_bit(TTY_OTHER_CLOSED
, &tty
->flags
);
59 #ifdef CONFIG_UNIX98_PTYS
60 if (tty
->driver
== ptm_driver
) {
61 mutex_lock(&devpts_mutex
);
62 if (tty
->link
->driver_data
)
63 devpts_pty_kill(tty
->link
->driver_data
);
64 mutex_unlock(&devpts_mutex
);
68 tty_vhangup(tty
->link
);
74 * The unthrottle routine is called by the line discipline to signal
75 * that it can receive more characters. For PTY's, the TTY_THROTTLED
76 * flag is always set, to force the line discipline to always call the
77 * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE
78 * characters in the queue. This is necessary since each time this
79 * happens, we need to wake up any sleeping processes that could be
80 * (1) trying to send data to the pty, or (2) waiting in wait_until_sent()
81 * for the pty buffer to be drained.
83 static void pty_unthrottle(struct tty_struct
*tty
)
85 tty_wakeup(tty
->link
);
86 set_bit(TTY_THROTTLED
, &tty
->flags
);
90 * pty_space - report space left for writing
91 * @to: tty we are writing into
93 * Limit the buffer space used by ptys to 8k.
96 static int pty_space(struct tty_struct
*to
)
98 int n
= tty_buffer_space_avail(to
->port
);
103 * pty_write - write to a pty
104 * @tty: the tty we write from
105 * @buf: kernel buffer of data
106 * @count: bytes to write
108 * Our "hardware" write method. Data is coming from the ldisc which
109 * may be in a non sleeping state. We simply throw this at the other
110 * end of the link as if we were an IRQ handler receiving stuff for
111 * the other side of the pty/tty pair.
114 static int pty_write(struct tty_struct
*tty
, const unsigned char *buf
, int c
)
116 struct tty_struct
*to
= tty
->link
;
122 /* Stuff the data into the input queue of the other end */
123 c
= tty_insert_flip_string(to
->port
, buf
, c
);
126 tty_flip_buffer_push(to
->port
);
132 * pty_write_room - write space
133 * @tty: tty we are writing from
135 * Report how many bytes the ldisc can send into the queue for
139 static int pty_write_room(struct tty_struct
*tty
)
143 return pty_space(tty
->link
);
147 * pty_chars_in_buffer - characters currently in our tx queue
150 * Report how much we have in the transmit queue. As everything is
151 * instantly at the other end this is easy to implement.
154 static int pty_chars_in_buffer(struct tty_struct
*tty
)
159 /* Set the lock flag on a pty */
160 static int pty_set_lock(struct tty_struct
*tty
, int __user
*arg
)
163 if (get_user(val
, arg
))
166 set_bit(TTY_PTY_LOCK
, &tty
->flags
);
168 clear_bit(TTY_PTY_LOCK
, &tty
->flags
);
172 static int pty_get_lock(struct tty_struct
*tty
, int __user
*arg
)
174 int locked
= test_bit(TTY_PTY_LOCK
, &tty
->flags
);
175 return put_user(locked
, arg
);
178 /* Set the packet mode on a pty */
179 static int pty_set_pktmode(struct tty_struct
*tty
, int __user
*arg
)
184 if (get_user(pktmode
, arg
))
187 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
191 tty
->link
->ctrl_status
= 0;
195 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
200 /* Get the packet mode of a pty */
201 static int pty_get_pktmode(struct tty_struct
*tty
, int __user
*arg
)
203 int pktmode
= tty
->packet
;
204 return put_user(pktmode
, arg
);
207 /* Send a signal to the slave */
208 static int pty_signal(struct tty_struct
*tty
, int sig
)
214 spin_lock_irqsave(&tty
->link
->ctrl_lock
, flags
);
215 pgrp
= get_pid(tty
->link
->pgrp
);
216 spin_unlock_irqrestore(&tty
->link
->ctrl_lock
, flags
);
218 kill_pgrp(pgrp
, sig
, 1);
224 static void pty_flush_buffer(struct tty_struct
*tty
)
226 struct tty_struct
*to
= tty
->link
;
231 /* tty_buffer_flush(to); FIXME */
233 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
234 tty
->ctrl_status
|= TIOCPKT_FLUSHWRITE
;
235 wake_up_interruptible(&to
->read_wait
);
236 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
240 static int pty_open(struct tty_struct
*tty
, struct file
*filp
)
242 if (!tty
|| !tty
->link
)
245 if (test_bit(TTY_OTHER_CLOSED
, &tty
->flags
))
247 if (test_bit(TTY_PTY_LOCK
, &tty
->link
->flags
))
249 if (tty
->driver
->subtype
== PTY_TYPE_SLAVE
&& tty
->link
->count
!= 1)
252 clear_bit(TTY_IO_ERROR
, &tty
->flags
);
253 clear_bit(TTY_OTHER_CLOSED
, &tty
->link
->flags
);
254 set_bit(TTY_THROTTLED
, &tty
->flags
);
258 set_bit(TTY_IO_ERROR
, &tty
->flags
);
262 static void pty_set_termios(struct tty_struct
*tty
,
263 struct ktermios
*old_termios
)
265 tty
->termios
.c_cflag
&= ~(CSIZE
| PARENB
);
266 tty
->termios
.c_cflag
|= (CS8
| CREAD
);
270 * pty_do_resize - resize event
271 * @tty: tty being resized
272 * @ws: window size being set.
274 * Update the termios variables and send the necessary signals to
275 * peform a terminal resize correctly
278 static int pty_resize(struct tty_struct
*tty
, struct winsize
*ws
)
280 struct pid
*pgrp
, *rpgrp
;
282 struct tty_struct
*pty
= tty
->link
;
284 /* For a PTY we need to lock the tty side */
285 mutex_lock(&tty
->winsize_mutex
);
286 if (!memcmp(ws
, &tty
->winsize
, sizeof(*ws
)))
289 /* Get the PID values and reference them so we can
290 avoid holding the tty ctrl lock while sending signals.
291 We need to lock these individually however. */
293 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
294 pgrp
= get_pid(tty
->pgrp
);
295 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
297 spin_lock_irqsave(&pty
->ctrl_lock
, flags
);
298 rpgrp
= get_pid(pty
->pgrp
);
299 spin_unlock_irqrestore(&pty
->ctrl_lock
, flags
);
302 kill_pgrp(pgrp
, SIGWINCH
, 1);
303 if (rpgrp
!= pgrp
&& rpgrp
)
304 kill_pgrp(rpgrp
, SIGWINCH
, 1);
310 pty
->winsize
= *ws
; /* Never used so will go away soon */
312 mutex_unlock(&tty
->winsize_mutex
);
317 * pty_start - start() handler
318 * pty_stop - stop() handler
319 * @tty: tty being flow-controlled
321 * Propagates the TIOCPKT status to the master pty.
323 * NB: only the master pty can be in packet mode so only the slave
324 * needs start()/stop() handlers
326 static void pty_start(struct tty_struct
*tty
)
330 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
331 if (tty
->link
&& tty
->link
->packet
) {
332 tty
->ctrl_status
&= ~TIOCPKT_STOP
;
333 tty
->ctrl_status
|= TIOCPKT_START
;
334 wake_up_interruptible_poll(&tty
->link
->read_wait
, POLLIN
);
336 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
339 static void pty_stop(struct tty_struct
*tty
)
343 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
344 if (tty
->link
&& tty
->link
->packet
) {
345 tty
->ctrl_status
&= ~TIOCPKT_START
;
346 tty
->ctrl_status
|= TIOCPKT_STOP
;
347 wake_up_interruptible_poll(&tty
->link
->read_wait
, POLLIN
);
349 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
353 * pty_common_install - set up the pty pair
354 * @driver: the pty driver
355 * @tty: the tty being instantiated
356 * @legacy: true if this is BSD style
358 * Perform the initial set up for the tty/pty pair. Called from the
359 * tty layer when the port is first opened.
361 * Locking: the caller must hold the tty_mutex
363 static int pty_common_install(struct tty_driver
*driver
, struct tty_struct
*tty
,
366 struct tty_struct
*o_tty
;
367 struct tty_port
*ports
[2];
368 int idx
= tty
->index
;
369 int retval
= -ENOMEM
;
371 ports
[0] = kmalloc(sizeof **ports
, GFP_KERNEL
);
372 ports
[1] = kmalloc(sizeof **ports
, GFP_KERNEL
);
373 if (!ports
[0] || !ports
[1])
375 if (!try_module_get(driver
->other
->owner
)) {
376 /* This cannot in fact currently happen */
379 o_tty
= alloc_tty_struct(driver
->other
, idx
);
384 /* We always use new tty termios data so we can do this
386 retval
= tty_init_termios(tty
);
390 retval
= tty_init_termios(o_tty
);
392 goto err_free_termios
;
394 driver
->other
->ttys
[idx
] = o_tty
;
395 driver
->ttys
[idx
] = tty
;
397 memset(&tty
->termios_locked
, 0, sizeof(tty
->termios_locked
));
398 tty
->termios
= driver
->init_termios
;
399 memset(&o_tty
->termios_locked
, 0, sizeof(tty
->termios_locked
));
400 o_tty
->termios
= driver
->other
->init_termios
;
404 * Everything allocated ... set up the o_tty structure.
406 tty_driver_kref_get(driver
->other
);
407 if (driver
->subtype
== PTY_TYPE_MASTER
)
409 /* Establish the links in both directions */
412 tty_port_init(ports
[0]);
413 tty_port_init(ports
[1]);
414 o_tty
->port
= ports
[0];
415 tty
->port
= ports
[1];
416 o_tty
->port
->itty
= o_tty
;
418 tty_driver_kref_get(driver
);
423 tty_free_termios(tty
);
425 deinitialize_tty_struct(o_tty
);
426 free_tty_struct(o_tty
);
428 module_put(driver
->other
->owner
);
435 static void pty_cleanup(struct tty_struct
*tty
)
437 tty_port_put(tty
->port
);
440 /* Traditional BSD devices */
441 #ifdef CONFIG_LEGACY_PTYS
443 static int pty_install(struct tty_driver
*driver
, struct tty_struct
*tty
)
445 return pty_common_install(driver
, tty
, true);
448 static void pty_remove(struct tty_driver
*driver
, struct tty_struct
*tty
)
450 struct tty_struct
*pair
= tty
->link
;
451 driver
->ttys
[tty
->index
] = NULL
;
453 pair
->driver
->ttys
[pair
->index
] = NULL
;
456 static int pty_bsd_ioctl(struct tty_struct
*tty
,
457 unsigned int cmd
, unsigned long arg
)
460 case TIOCSPTLCK
: /* Set PT Lock (disallow slave open) */
461 return pty_set_lock(tty
, (int __user
*) arg
);
462 case TIOCGPTLCK
: /* Get PT Lock status */
463 return pty_get_lock(tty
, (int __user
*)arg
);
464 case TIOCPKT
: /* Set PT packet mode */
465 return pty_set_pktmode(tty
, (int __user
*)arg
);
466 case TIOCGPKT
: /* Get PT packet mode */
467 return pty_get_pktmode(tty
, (int __user
*)arg
);
468 case TIOCSIG
: /* Send signal to other side of pty */
469 return pty_signal(tty
, (int) arg
);
470 case TIOCGPTN
: /* TTY returns ENOTTY, but glibc expects EINVAL here */
476 static int legacy_count
= CONFIG_LEGACY_PTY_COUNT
;
477 module_param(legacy_count
, int, 0);
480 * The master side of a pty can do TIOCSPTLCK and thus
483 static const struct tty_operations master_pty_ops_bsd
= {
484 .install
= pty_install
,
488 .write_room
= pty_write_room
,
489 .flush_buffer
= pty_flush_buffer
,
490 .chars_in_buffer
= pty_chars_in_buffer
,
491 .unthrottle
= pty_unthrottle
,
492 .set_termios
= pty_set_termios
,
493 .ioctl
= pty_bsd_ioctl
,
494 .cleanup
= pty_cleanup
,
495 .resize
= pty_resize
,
499 static const struct tty_operations slave_pty_ops_bsd
= {
500 .install
= pty_install
,
504 .write_room
= pty_write_room
,
505 .flush_buffer
= pty_flush_buffer
,
506 .chars_in_buffer
= pty_chars_in_buffer
,
507 .unthrottle
= pty_unthrottle
,
508 .set_termios
= pty_set_termios
,
509 .cleanup
= pty_cleanup
,
510 .resize
= pty_resize
,
516 static void __init
legacy_pty_init(void)
518 struct tty_driver
*pty_driver
, *pty_slave_driver
;
520 if (legacy_count
<= 0)
523 pty_driver
= tty_alloc_driver(legacy_count
,
524 TTY_DRIVER_RESET_TERMIOS
|
525 TTY_DRIVER_REAL_RAW
|
526 TTY_DRIVER_DYNAMIC_ALLOC
);
527 if (IS_ERR(pty_driver
))
528 panic("Couldn't allocate pty driver");
530 pty_slave_driver
= tty_alloc_driver(legacy_count
,
531 TTY_DRIVER_RESET_TERMIOS
|
532 TTY_DRIVER_REAL_RAW
|
533 TTY_DRIVER_DYNAMIC_ALLOC
);
534 if (IS_ERR(pty_slave_driver
))
535 panic("Couldn't allocate pty slave driver");
537 pty_driver
->driver_name
= "pty_master";
538 pty_driver
->name
= "pty";
539 pty_driver
->major
= PTY_MASTER_MAJOR
;
540 pty_driver
->minor_start
= 0;
541 pty_driver
->type
= TTY_DRIVER_TYPE_PTY
;
542 pty_driver
->subtype
= PTY_TYPE_MASTER
;
543 pty_driver
->init_termios
= tty_std_termios
;
544 pty_driver
->init_termios
.c_iflag
= 0;
545 pty_driver
->init_termios
.c_oflag
= 0;
546 pty_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
547 pty_driver
->init_termios
.c_lflag
= 0;
548 pty_driver
->init_termios
.c_ispeed
= 38400;
549 pty_driver
->init_termios
.c_ospeed
= 38400;
550 pty_driver
->other
= pty_slave_driver
;
551 tty_set_operations(pty_driver
, &master_pty_ops_bsd
);
553 pty_slave_driver
->driver_name
= "pty_slave";
554 pty_slave_driver
->name
= "ttyp";
555 pty_slave_driver
->major
= PTY_SLAVE_MAJOR
;
556 pty_slave_driver
->minor_start
= 0;
557 pty_slave_driver
->type
= TTY_DRIVER_TYPE_PTY
;
558 pty_slave_driver
->subtype
= PTY_TYPE_SLAVE
;
559 pty_slave_driver
->init_termios
= tty_std_termios
;
560 pty_slave_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
561 pty_slave_driver
->init_termios
.c_ispeed
= 38400;
562 pty_slave_driver
->init_termios
.c_ospeed
= 38400;
563 pty_slave_driver
->other
= pty_driver
;
564 tty_set_operations(pty_slave_driver
, &slave_pty_ops_bsd
);
566 if (tty_register_driver(pty_driver
))
567 panic("Couldn't register pty driver");
568 if (tty_register_driver(pty_slave_driver
))
569 panic("Couldn't register pty slave driver");
572 static inline void legacy_pty_init(void) { }
576 #ifdef CONFIG_UNIX98_PTYS
578 static struct cdev ptmx_cdev
;
580 static int pty_unix98_ioctl(struct tty_struct
*tty
,
581 unsigned int cmd
, unsigned long arg
)
584 case TIOCSPTLCK
: /* Set PT Lock (disallow slave open) */
585 return pty_set_lock(tty
, (int __user
*)arg
);
586 case TIOCGPTLCK
: /* Get PT Lock status */
587 return pty_get_lock(tty
, (int __user
*)arg
);
588 case TIOCPKT
: /* Set PT packet mode */
589 return pty_set_pktmode(tty
, (int __user
*)arg
);
590 case TIOCGPKT
: /* Get PT packet mode */
591 return pty_get_pktmode(tty
, (int __user
*)arg
);
592 case TIOCGPTN
: /* Get PT Number */
593 return put_user(tty
->index
, (unsigned int __user
*)arg
);
594 case TIOCSIG
: /* Send signal to other side of pty */
595 return pty_signal(tty
, (int) arg
);
602 * ptm_unix98_lookup - find a pty master
603 * @driver: ptm driver
606 * Look up a pty master device. Called under the tty_mutex for now.
607 * This provides our locking.
610 static struct tty_struct
*ptm_unix98_lookup(struct tty_driver
*driver
,
611 struct inode
*ptm_inode
, int idx
)
613 /* Master must be open via /dev/ptmx */
614 return ERR_PTR(-EIO
);
618 * pts_unix98_lookup - find a pty slave
619 * @driver: pts driver
622 * Look up a pty master device. Called under the tty_mutex for now.
623 * This provides our locking for the tty pointer.
626 static struct tty_struct
*pts_unix98_lookup(struct tty_driver
*driver
,
627 struct inode
*pts_inode
, int idx
)
629 struct tty_struct
*tty
;
631 mutex_lock(&devpts_mutex
);
632 tty
= devpts_get_priv(pts_inode
);
633 mutex_unlock(&devpts_mutex
);
634 /* Master must be open before slave */
636 return ERR_PTR(-EIO
);
640 /* We have no need to install and remove our tty objects as devpts does all
643 static int pty_unix98_install(struct tty_driver
*driver
, struct tty_struct
*tty
)
645 return pty_common_install(driver
, tty
, false);
648 static void pty_unix98_remove(struct tty_driver
*driver
, struct tty_struct
*tty
)
652 /* this is called once with whichever end is closed last */
653 static void pty_unix98_shutdown(struct tty_struct
*tty
)
655 devpts_kill_index(tty
->driver_data
, tty
->index
);
658 static const struct tty_operations ptm_unix98_ops
= {
659 .lookup
= ptm_unix98_lookup
,
660 .install
= pty_unix98_install
,
661 .remove
= pty_unix98_remove
,
665 .write_room
= pty_write_room
,
666 .flush_buffer
= pty_flush_buffer
,
667 .chars_in_buffer
= pty_chars_in_buffer
,
668 .unthrottle
= pty_unthrottle
,
669 .set_termios
= pty_set_termios
,
670 .ioctl
= pty_unix98_ioctl
,
671 .resize
= pty_resize
,
672 .shutdown
= pty_unix98_shutdown
,
673 .cleanup
= pty_cleanup
676 static const struct tty_operations pty_unix98_ops
= {
677 .lookup
= pts_unix98_lookup
,
678 .install
= pty_unix98_install
,
679 .remove
= pty_unix98_remove
,
683 .write_room
= pty_write_room
,
684 .flush_buffer
= pty_flush_buffer
,
685 .chars_in_buffer
= pty_chars_in_buffer
,
686 .unthrottle
= pty_unthrottle
,
687 .set_termios
= pty_set_termios
,
690 .shutdown
= pty_unix98_shutdown
,
691 .cleanup
= pty_cleanup
,
695 * ptmx_open - open a unix 98 pty master
696 * @inode: inode of device file
697 * @filp: file pointer to tty
699 * Allocate a unix98 pty master device from the ptmx driver.
701 * Locking: tty_mutex protects the init_dev work. tty->count should
703 * allocated_ptys_lock handles the list of free pty numbers
706 static int ptmx_open(struct inode
*inode
, struct file
*filp
)
708 struct tty_struct
*tty
;
709 struct inode
*slave_inode
;
713 nonseekable_open(inode
, filp
);
715 /* We refuse fsnotify events on ptmx, since it's a shared resource */
716 filp
->f_mode
|= FMODE_NONOTIFY
;
718 retval
= tty_alloc_file(filp
);
722 /* find a device that is not in use. */
723 mutex_lock(&devpts_mutex
);
724 index
= devpts_new_index(inode
);
727 mutex_unlock(&devpts_mutex
);
731 mutex_unlock(&devpts_mutex
);
733 mutex_lock(&tty_mutex
);
734 tty
= tty_init_dev(ptm_driver
, index
);
737 retval
= PTR_ERR(tty
);
741 /* The tty returned here is locked so we can safely
743 mutex_unlock(&tty_mutex
);
745 set_bit(TTY_PTY_LOCK
, &tty
->flags
); /* LOCK THE SLAVE */
746 tty
->driver_data
= inode
;
748 tty_add_file(tty
, filp
);
750 slave_inode
= devpts_pty_new(inode
,
751 MKDEV(UNIX98_PTY_SLAVE_MAJOR
, index
), index
,
753 if (IS_ERR(slave_inode
)) {
754 retval
= PTR_ERR(slave_inode
);
757 tty
->link
->driver_data
= slave_inode
;
759 retval
= ptm_driver
->ops
->open(tty
, filp
);
767 tty_release(inode
, filp
);
770 mutex_unlock(&tty_mutex
);
771 devpts_kill_index(inode
, index
);
777 static struct file_operations ptmx_fops
;
779 static void __init
unix98_pty_init(void)
781 ptm_driver
= tty_alloc_driver(NR_UNIX98_PTY_MAX
,
782 TTY_DRIVER_RESET_TERMIOS
|
783 TTY_DRIVER_REAL_RAW
|
784 TTY_DRIVER_DYNAMIC_DEV
|
785 TTY_DRIVER_DEVPTS_MEM
|
786 TTY_DRIVER_DYNAMIC_ALLOC
);
787 if (IS_ERR(ptm_driver
))
788 panic("Couldn't allocate Unix98 ptm driver");
789 pts_driver
= tty_alloc_driver(NR_UNIX98_PTY_MAX
,
790 TTY_DRIVER_RESET_TERMIOS
|
791 TTY_DRIVER_REAL_RAW
|
792 TTY_DRIVER_DYNAMIC_DEV
|
793 TTY_DRIVER_DEVPTS_MEM
|
794 TTY_DRIVER_DYNAMIC_ALLOC
);
795 if (IS_ERR(pts_driver
))
796 panic("Couldn't allocate Unix98 pts driver");
798 ptm_driver
->driver_name
= "pty_master";
799 ptm_driver
->name
= "ptm";
800 ptm_driver
->major
= UNIX98_PTY_MASTER_MAJOR
;
801 ptm_driver
->minor_start
= 0;
802 ptm_driver
->type
= TTY_DRIVER_TYPE_PTY
;
803 ptm_driver
->subtype
= PTY_TYPE_MASTER
;
804 ptm_driver
->init_termios
= tty_std_termios
;
805 ptm_driver
->init_termios
.c_iflag
= 0;
806 ptm_driver
->init_termios
.c_oflag
= 0;
807 ptm_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
808 ptm_driver
->init_termios
.c_lflag
= 0;
809 ptm_driver
->init_termios
.c_ispeed
= 38400;
810 ptm_driver
->init_termios
.c_ospeed
= 38400;
811 ptm_driver
->other
= pts_driver
;
812 tty_set_operations(ptm_driver
, &ptm_unix98_ops
);
814 pts_driver
->driver_name
= "pty_slave";
815 pts_driver
->name
= "pts";
816 pts_driver
->major
= UNIX98_PTY_SLAVE_MAJOR
;
817 pts_driver
->minor_start
= 0;
818 pts_driver
->type
= TTY_DRIVER_TYPE_PTY
;
819 pts_driver
->subtype
= PTY_TYPE_SLAVE
;
820 pts_driver
->init_termios
= tty_std_termios
;
821 pts_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
822 pts_driver
->init_termios
.c_ispeed
= 38400;
823 pts_driver
->init_termios
.c_ospeed
= 38400;
824 pts_driver
->other
= ptm_driver
;
825 tty_set_operations(pts_driver
, &pty_unix98_ops
);
827 if (tty_register_driver(ptm_driver
))
828 panic("Couldn't register Unix98 ptm driver");
829 if (tty_register_driver(pts_driver
))
830 panic("Couldn't register Unix98 pts driver");
832 /* Now create the /dev/ptmx special device */
833 tty_default_fops(&ptmx_fops
);
834 ptmx_fops
.open
= ptmx_open
;
836 cdev_init(&ptmx_cdev
, &ptmx_fops
);
837 if (cdev_add(&ptmx_cdev
, MKDEV(TTYAUX_MAJOR
, 2), 1) ||
838 register_chrdev_region(MKDEV(TTYAUX_MAJOR
, 2), 1, "/dev/ptmx") < 0)
839 panic("Couldn't register /dev/ptmx driver");
840 device_create(tty_class
, NULL
, MKDEV(TTYAUX_MAJOR
, 2), NULL
, "ptmx");
844 static inline void unix98_pty_init(void) { }
847 static int __init
pty_init(void)
853 module_init(pty_init
);