1 /*
2 * (MPSAFE)
3 *
4 * Copyright (c) 1982, 1986, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95
32 * $FreeBSD: src/sys/kern/tty_pty.c,v 1.74.2.4 2002/02/20 19:58:13 dillon Exp $
33 */
34
35 /*
36 * Most functions here could use a separate lock to deal with concurrent
37 * access to the 'pt's.
38 */
39
40 /*
41 * Pseudo-teletype Driver
42 * (Actually two drivers, requiring two dev_ops structures)
43 */
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/uio.h>
48 #include <sys/proc.h>
49 #include <sys/caps.h>
50 #include <sys/tty.h>
51 #include <sys/ttydefaults.h> /* for TTYDEF_* */
52 #include <sys/conf.h>
53 #include <sys/fcntl.h>
54 #include <sys/kernel.h>
55 #include <sys/vnode.h>
56 #include <sys/signalvar.h>
57 #include <sys/malloc.h>
58 #include <sys/device.h>
59 #include <sys/devfs.h>
60 #include <sys/stat.h>
61 #include <sys/sysctl.h>
62
63 MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
64
65 static void ptsstart (struct tty *tp);
66 static void ptsstop (struct tty *tp, int rw);
67 static void ptsunhold (struct tty *tp);
68 static void ptcwakeup (struct tty *tp, int flag);
69 static void ptyinit (int n);
70 static int filt_ptcread (struct knote *kn, long hint);
71 static void filt_ptcrdetach (struct knote *kn);
72 static int filt_ptcwrite (struct knote *kn, long hint);
73 static void filt_ptcwdetach (struct knote *kn);
74
75 static d_open_t ptsopen;
76 static d_close_t ptsclose;
77 static d_read_t ptsread;
78 static d_write_t ptswrite;
79 static d_ioctl_t ptyioctl;
80 static d_open_t ptcopen;
81 static d_close_t ptcclose;
82 static d_read_t ptcread;
83 static d_write_t ptcwrite;
84 static d_kqfilter_t ptckqfilter;
85
86 DEVFS_DEFINE_CLONE_BITMAP(pty);
87 static struct pt_ioctl **ptis; /* keep pti's intact */
88
89 static d_clone_t ptyclone;
90
91 static int pty_debug_level = 0;
92
93 static struct dev_ops pts98_ops = {
94 { "pts98", 0, D_TTY | D_MPSAFE },
95 .d_open = ptsopen,
96 .d_close = ptsclose,
97 .d_read = ptsread,
98 .d_write = ptswrite,
99 .d_ioctl = ptyioctl,
100 .d_kqfilter = ttykqfilter,
101 .d_revoke = ttyrevoke
102 };
103
104 static struct dev_ops ptc98_ops = {
105 { "ptc98", 0, D_TTY | D_MASTER | D_MPSAFE },
106 .d_open = ptcopen,
107 .d_close = ptcclose,
108 .d_read = ptcread,
109 .d_write = ptcwrite,
110 .d_ioctl = ptyioctl,
111 .d_kqfilter = ptckqfilter,
112 .d_revoke = ttyrevoke
113 };
114
115 static struct dev_ops pts_ops = {
116 { "pts", 0, D_TTY | D_MPSAFE },
117 .d_open = ptsopen,
118 .d_close = ptsclose,
119 .d_read = ptsread,
120 .d_write = ptswrite,
121 .d_ioctl = ptyioctl,
122 .d_kqfilter = ttykqfilter,
123 .d_revoke = ttyrevoke
124 };
125
126 #define CDEV_MAJOR_C 6
127 static struct dev_ops ptc_ops = {
128 { "ptc", 0, D_TTY | D_MASTER | D_MPSAFE },
129 .d_open = ptcopen,
130 .d_close = ptcclose,
131 .d_read = ptcread,
132 .d_write = ptcwrite,
133 .d_ioctl = ptyioctl,
134 .d_kqfilter = ptckqfilter,
135 .d_revoke = ttyrevoke
136 };
137
138 #define BUFSIZ 100 /* Chunk size iomoved to/from user */
139
140 #define MAXPTYS 1000 /* Maximum cloneable ptys */
141
142 struct pt_ioctl {
143 int pt_flags;
144 int pt_refs; /* Structural references interlock S/MOPEN */
145 int pt_uminor;
146 struct kqinfo pt_kqr, pt_kqw;
147 u_char pt_send;
148 u_char pt_ucntl;
149 struct tty pt_tty;
150 cdev_t devs, devc;
151 struct prison *pt_prison;
152 };
153
154 /*
155 * pt_flags ptc state
156 */
157 #define PF_PKT 0x0008 /* packet mode */
158 #define PF_STOPPED 0x0010 /* user told stopped */
159 #define PF_REMOTE 0x0020 /* remote and flow controlled input */
160 #define PF_NOSTOP 0x0040
161 #define PF_UCNTL 0x0080 /* user control mode */
162
163 #define PF_PTCSTATEMASK 0x00FF
164
165 /*
166 * pt_flags open state. Note that PF_SCLOSED is used to activate
167 * read EOF on the ptc so it is only set after the slave has been
168 * opened and then closed, and cleared again if the slave is opened
169 * again.
170 */
171 #define PF_UNIX98 0x0100
172 #define PF_SOPEN 0x0200
173 #define PF_MOPEN 0x0400
174 #define PF_SCLOSED 0x0800
175 #define PF_TERMINATED 0x8000
176
177 /*
178 * This function creates and initializes a pts/ptc pair
179 *
180 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
181 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
182 *
183 * XXX: define and add mapping of upper minor bits to allow more
184 * than 256 ptys.
185 */
186 static void
ptyinit(int n)187 ptyinit(int n)
188 {
189 cdev_t devs, devc;
190 char *names = "pqrsPQRS";
191 struct pt_ioctl *pti;
192
193 /* For now we only map the lower 8 bits of the minor */
194 if (n & ~0xff)
195 return;
196
197 pti = kmalloc(sizeof(*pti), M_PTY, M_WAITOK | M_ZERO);
198 pti->devs = devs = make_dev(&pts_ops, n, 0, 0, 0666,
199 "tty%c%c",
200 names[n / 32], hex2ascii(n % 32));
201 pti->devc = devc = make_dev(&ptc_ops, n, 0, 0, 0666,
202 "pty%c%c",
203 names[n / 32], hex2ascii(n % 32));
204
205 pti->pt_tty.t_dev = devs;
206 pti->pt_uminor = n;
207 devs->si_drv1 = devc->si_drv1 = pti;
208 devs->si_tty = devc->si_tty = &pti->pt_tty;
209 devs->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
210 devc->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
211 ttyinit(&pti->pt_tty);
212 ttyregister(&pti->pt_tty);
213 }
214
215 static int
ptyclone(struct dev_clone_args * ap)216 ptyclone(struct dev_clone_args *ap)
217 {
218 int unit;
219 struct pt_ioctl *pti;
220
221 /*
222 * Limit the number of unix98 pty (slave) devices to 1000 for now.
223 *
224 * If this limit is reached, we don't clone and return an error
225 * to devfs.
226 */
227 unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(pty), MAXPTYS);
228
229 if (unit < 0) {
230 ap->a_dev = NULL;
231 return 1;
232 }
233
234 /*
235 * pti structures must be persistent once allocated.
236 */
237 if ((pti = ptis[unit]) == NULL) {
238 lwkt_gettoken(&tty_token);
239 pti = kmalloc(sizeof(*pti), M_PTY, M_WAITOK | M_ZERO);
240 if (ptis[unit] == NULL) {
241 ptis[unit] = pti;
242 ttyinit(&pti->pt_tty);
243 } else {
244 kfree(pti, M_PTY);
245 }
246 lwkt_reltoken(&tty_token);
247 }
248
249 /*
250 * The cloning bitmap should guarantee isolation during
251 * initialization.
252 */
253 pti->devc = make_only_dev(&ptc98_ops, unit,
254 ap->a_cred->cr_ruid,
255 0, 0600, "ptm/%d", unit);
256 pti->devs = make_dev(&pts98_ops, unit,
257 ap->a_cred->cr_ruid,
258 GID_TTY, 0620, "pts/%d", unit);
259 ap->a_dev = pti->devc;
260
261 pti->devs->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
262 pti->devc->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
263
264 pti->pt_tty.t_dev = pti->devs;
265 pti->pt_flags = PF_UNIX98;
266 pti->pt_uminor = unit;
267 pti->devs->si_drv1 = pti->devc->si_drv1 = pti;
268 pti->devs->si_tty = pti->devc->si_tty = &pti->pt_tty;
269 ttyregister(&pti->pt_tty);
270
271 return 0;
272 }
273
274 /*
275 * pti_hold() prevents the pti from being destroyed due to a termination
276 * while a pt*open() is blocked.
277 *
278 * This function returns non-zero if we cannot hold due to a termination
279 * interlock.
280 */
281 static int
pti_hold(struct pt_ioctl * pti)282 pti_hold(struct pt_ioctl *pti)
283 {
284 if (pti->pt_flags & PF_TERMINATED)
285 return(ENXIO);
286 ++pti->pt_refs;
287
288 return(0);
289 }
290
291 /*
292 * pti_done() releases the reference and checks to see if both sides have
293 * been closed on a unix98 pty, allowing us to destroy the device and
294 * release resources.
295 *
296 * We do not release resources on non-unix98 ptys. Those are left
297 * statically allocated.
298 */
299 static void
pti_done(struct pt_ioctl * pti)300 pti_done(struct pt_ioctl *pti)
301 {
302 lwkt_gettoken(&pti->pt_tty.t_token);
303 if (--pti->pt_refs == 0) {
304 cdev_t dev;
305 int uminor_no;
306
307 /*
308 * Only unix09 ptys are freed up (the pti structure itself
309 * is never freed, regardless).
310 */
311 if ((pti->pt_flags & PF_UNIX98) == 0) {
312 lwkt_reltoken(&pti->pt_tty.t_token);
313 return;
314 }
315
316 /*
317 * Interlock open attempts against termination by setting
318 * PF_TERMINATED. This allows us to block while cleaning
319 * out the device infrastructure.
320 *
321 * Do not terminate the tty if it still has a session
322 * association (t_refs).
323 */
324 if ((pti->pt_flags & (PF_SOPEN|PF_MOPEN)) == 0 &&
325 pti->pt_tty.t_refs == 0) {
326 pti->pt_flags |= PF_TERMINATED;
327 uminor_no = pti->pt_uminor;
328
329 if ((dev = pti->devs) != NULL) {
330 dev->si_drv1 = NULL;
331 pti->devs = NULL;
332 destroy_dev(dev);
333 }
334 if ((dev = pti->devc) != NULL) {
335 dev->si_drv1 = NULL;
336 pti->devc = NULL;
337 destroy_dev(dev);
338 }
339 ttyunregister(&pti->pt_tty);
340 pti->pt_tty.t_dev = NULL;
341
342 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(pty),
343 uminor_no);
344 /* pti structure remains intact */
345 }
346 }
347 lwkt_reltoken(&pti->pt_tty.t_token);
348 }
349
350 /*ARGSUSED*/
351 static int
ptsopen(struct dev_open_args * ap)352 ptsopen(struct dev_open_args *ap)
353 {
354 cdev_t dev = ap->a_head.a_dev;
355 struct tty *tp;
356 int error;
357 struct pt_ioctl *pti;
358
359 /*
360 * The pti will already be assigned by the clone code or
361 * pre-created if a non-unix 98 pty. If si_drv1 is NULL
362 * we are somehow racing a unix98 termination.
363 */
364 if (dev->si_drv1 == NULL)
365 return(ENXIO);
366 pti = dev->si_drv1;
367
368 lwkt_gettoken(&pti->pt_tty.t_token);
369 if (pti_hold(pti)) {
370 lwkt_reltoken(&pti->pt_tty.t_token);
371 return(ENXIO);
372 }
373
374 tp = dev->si_tty;
375
376 /*
377 * Reinit most of the tty state if it isn't open. Handle
378 * exclusive access.
379 */
380 if ((tp->t_state & TS_ISOPEN) == 0) {
381 ttychars(tp); /* Set up default chars */
382 tp->t_iflag = TTYDEF_IFLAG;
383 tp->t_oflag = TTYDEF_OFLAG;
384 tp->t_lflag = TTYDEF_LFLAG;
385 tp->t_cflag = TTYDEF_CFLAG;
386 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
387 } else if ((tp->t_state & TS_XCLUDE) &&
388 caps_priv_check(ap->a_cred, SYSCAP_RESTRICTEDROOT))
389 {
390 pti_done(pti);
391 lwkt_reltoken(&pti->pt_tty.t_token);
392 return (EBUSY);
393 } else if (pti->pt_prison != ap->a_cred->cr_prison) {
394 pti_done(pti);
395 lwkt_reltoken(&pti->pt_tty.t_token);
396 return (EBUSY);
397 }
398
399 /*
400 * If the ptc is already present this will connect us up. It
401 * is unclear if this is actually needed.
402 *
403 * If neither side is open be sure to clear any left over
404 * ZOMBIE state before continuing.
405 */
406 if (tp->t_oproc)
407 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
408 else if ((pti->pt_flags & PF_SOPEN) == 0)
409 tp->t_state &= ~TS_ZOMBIE;
410
411 /*
412 * Wait for the carrier (ptc side)
413 */
414 while ((tp->t_state & TS_CARR_ON) == 0) {
415 if (ap->a_oflags & FNONBLOCK)
416 break;
417 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ptsopn", 0);
418 if (error) {
419 pti_done(pti);
420 lwkt_reltoken(&pti->pt_tty.t_token);
421 return (error);
422 }
423 }
424
425 /*
426 * Mark the tty open and mark the slave side as being open.
427 */
428 error = (*linesw[tp->t_line].l_open)(dev, tp);
429
430 if (error == 0) {
431 pti->pt_flags |= PF_SOPEN;
432 pti->pt_flags &= ~PF_SCLOSED;
433 ptcwakeup(tp, FREAD|FWRITE);
434 }
435 pti_done(pti);
436 lwkt_reltoken(&pti->pt_tty.t_token);
437
438 return (error);
439 }
440
441 static int
ptsclose(struct dev_close_args * ap)442 ptsclose(struct dev_close_args *ap)
443 {
444 cdev_t dev = ap->a_head.a_dev;
445 struct tty *tp;
446 struct pt_ioctl *pti = dev->si_drv1;
447 int err;
448
449 lwkt_gettoken(&pti->pt_tty.t_token);
450 if (pti_hold(pti))
451 panic("ptsclose on terminated pti");
452
453 /*
454 * Disconnect the slave side
455 */
456 tp = dev->si_tty;
457 err = (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
458 ptsstop(tp, FREAD|FWRITE);
459 ttyclose(tp); /* clears t_state */
460
461 /*
462 * Mark the pts side closed and signal the ptc. Do not mark the
463 * tty a zombie... that is, allow the tty to be re-opened as long
464 * as the ptc is still open. The ptc will read() EOFs until the
465 * pts side is reopened or the ptc is closed.
466 *
467 * xterm() depends on this behavior as it will revoke() the pts
468 * and then reopen it after the (unnecessary old code) chmod.
469 */
470 pti->pt_flags &= ~PF_SOPEN;
471 pti->pt_flags |= PF_SCLOSED;
472 if (tp->t_oproc)
473 ptcwakeup(tp, FREAD);
474 pti_done(pti);
475 lwkt_reltoken(&pti->pt_tty.t_token);
476 return (err);
477 }
478
479 static int
ptsread(struct dev_read_args * ap)480 ptsread(struct dev_read_args *ap)
481 {
482 cdev_t dev = ap->a_head.a_dev;
483 struct proc *p = curproc;
484 struct tty *tp = dev->si_tty;
485 struct pt_ioctl *pti = dev->si_drv1;
486 struct lwp *lp;
487
488 int error = 0;
489
490 lp = curthread->td_lwp;
491
492 lwkt_gettoken(&pti->pt_tty.t_token);
493 again:
494 if (pti->pt_flags & PF_REMOTE) {
495 while (isbackground(p, tp)) {
496 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
497 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
498 p->p_pgrp->pg_jobc == 0 ||
499 (p->p_flags & P_PPWAIT)) {
500 lwkt_reltoken(&pti->pt_tty.t_token);
501 return (EIO);
502 }
503 pgsignal(p->p_pgrp, SIGTTIN, 1);
504 error = ttysleep(tp, &lbolt, PCATCH, "ptsbg", 0);
505 if (error) {
506 lwkt_reltoken(&pti->pt_tty.t_token);
507 return (error);
508 }
509 }
510 if (tp->t_canq.c_cc == 0) {
511 if (ap->a_ioflag & IO_NDELAY) {
512 lwkt_reltoken(&pti->pt_tty.t_token);
513 return (EWOULDBLOCK);
514 }
515 error = ttysleep(tp, TSA_PTS_READ(tp), PCATCH,
516 "ptsin", 0);
517 if (error) {
518 lwkt_reltoken(&pti->pt_tty.t_token);
519 return (error);
520 }
521 goto again;
522 }
523 while (tp->t_canq.c_cc > 1 && ap->a_uio->uio_resid > 0)
524 if (ureadc(clist_getc(&tp->t_canq), ap->a_uio) < 0) {
525 error = EFAULT;
526 break;
527 }
528 if (tp->t_canq.c_cc == 1)
529 clist_getc(&tp->t_canq);
530 if (tp->t_canq.c_cc) {
531 lwkt_reltoken(&pti->pt_tty.t_token);
532 return (error);
533 }
534 } else
535 if (tp->t_oproc)
536 error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
537 ptcwakeup(tp, FWRITE);
538 lwkt_reltoken(&pti->pt_tty.t_token);
539
540 return (error);
541 }
542
543 /*
544 * Write to pseudo-tty.
545 * Wakeups of controlling tty will happen
546 * indirectly, when tty driver calls ptsstart.
547 */
548 static int
ptswrite(struct dev_write_args * ap)549 ptswrite(struct dev_write_args *ap)
550 {
551 cdev_t dev = ap->a_head.a_dev;
552 struct tty *tp;
553 int ret;
554
555 tp = dev->si_tty;
556 lwkt_gettoken(&tp->t_token);
557 if (tp->t_oproc == NULL) {
558 lwkt_reltoken(&tp->t_token);
559 return (EIO);
560 }
561 ret = ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));
562 lwkt_reltoken(&tp->t_token);
563
564 return ret;
565 }
566
567 /*
568 * Start output on pseudo-tty.
569 * Wake up process selecting or sleeping for input from controlling tty.
570 */
571 static void
ptsstart(struct tty * tp)572 ptsstart(struct tty *tp)
573 {
574 struct pt_ioctl *pti = tp->t_dev->si_drv1;
575
576 lwkt_gettoken(&pti->pt_tty.t_token);
577 lwkt_gettoken(&tp->t_token);
578 if (tp->t_state & TS_TTSTOP) {
579 lwkt_reltoken(&tp->t_token);
580 lwkt_reltoken(&pti->pt_tty.t_token);
581 return;
582 }
583 if (pti) {
584 if (pti->pt_flags & PF_STOPPED) {
585 pti->pt_flags &= ~PF_STOPPED;
586 pti->pt_send = TIOCPKT_START;
587 }
588 }
589 ptcwakeup(tp, FREAD);
590 lwkt_reltoken(&tp->t_token);
591 lwkt_reltoken(&pti->pt_tty.t_token);
592 }
593
594 /*
595 * NOTE: Must be called with tp->t_token held
596 */
597 static void
ptcwakeup(struct tty * tp,int flag)598 ptcwakeup(struct tty *tp, int flag)
599 {
600 if (flag & FREAD) {
601 wakeup(TSA_PTC_READ(tp));
602 KNOTE(&tp->t_rkq.ki_note, 0);
603 }
604 if (flag & FWRITE) {
605 wakeup(TSA_PTC_WRITE(tp));
606 KNOTE(&tp->t_wkq.ki_note, 0);
607 }
608 }
609
610 static int
ptcopen(struct dev_open_args * ap)611 ptcopen(struct dev_open_args *ap)
612 {
613 cdev_t dev = ap->a_head.a_dev;
614 struct tty *tp;
615 struct pt_ioctl *pti;
616
617 /*
618 * The pti will already be assigned by the clone code or
619 * pre-created if a non-unix 98 pty. If si_drv1 is NULL
620 * we are somehow racing a unix98 termination.
621 */
622 pti = dev->si_drv1;
623 if (pti == NULL)
624 return(ENXIO);
625
626 lwkt_gettoken(&pti->pt_tty.t_token);
627 if (pti_hold(pti)) {
628 lwkt_reltoken(&pti->pt_tty.t_token);
629 return(ENXIO);
630 }
631 if (pti->pt_prison && pti->pt_prison != ap->a_cred->cr_prison) {
632 pti_done(pti);
633 lwkt_reltoken(&pti->pt_tty.t_token);
634 return(EBUSY);
635 }
636 tp = dev->si_tty;
637 lwkt_gettoken(&tp->t_token);
638 if (tp->t_oproc) {
639 pti_done(pti);
640 lwkt_reltoken(&tp->t_token);
641 lwkt_reltoken(&pti->pt_tty.t_token);
642 return (EIO);
643 }
644
645 /*
646 * If the slave side is not yet open clear any left over zombie
647 * state before doing our modem control.
648 */
649 if ((pti->pt_flags & PF_SOPEN) == 0)
650 tp->t_state &= ~TS_ZOMBIE;
651
652 tp->t_oproc = ptsstart;
653 tp->t_stop = ptsstop;
654 tp->t_unhold = ptsunhold;
655
656 /*
657 * Carrier on!
658 */
659 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
660
661 tp->t_lflag &= ~EXTPROC;
662 pti->pt_prison = ap->a_cred->cr_prison;
663 pti->pt_flags &= ~PF_PTCSTATEMASK;
664 pti->pt_send = 0;
665 pti->pt_ucntl = 0;
666
667 pti->devs->si_uid = ap->a_cred->cr_uid;
668 pti->devs->si_gid = ap->a_cred->cr_uid ? GID_TTY : 0;
669 pti->devs->si_perms = 0600;
670 pti->devc->si_uid = ap->a_cred->cr_uid;
671 pti->devc->si_gid = 0;
672 pti->devc->si_perms = 0600;
673
674 /*
675 * Mark master side open. This does not cause any events
676 * on the slave side.
677 */
678 pti->pt_flags |= PF_MOPEN;
679 pti_done(pti);
680
681 lwkt_reltoken(&tp->t_token);
682 lwkt_reltoken(&pti->pt_tty.t_token);
683
684 return (0);
685 }
686
687 static int
ptcclose(struct dev_close_args * ap)688 ptcclose(struct dev_close_args *ap)
689 {
690 cdev_t dev = ap->a_head.a_dev;
691 struct tty *tp;
692 struct pt_ioctl *pti = dev->si_drv1;
693
694 lwkt_gettoken(&pti->pt_tty.t_token);
695 if (pti_hold(pti)) {
696 lwkt_reltoken(&pti->pt_tty.t_token);
697 panic("ptcclose on terminated pti");
698 }
699 tp = dev->si_tty;
700 lwkt_gettoken(&tp->t_token);
701
702 (void)(*linesw[tp->t_line].l_modem)(tp, 0);
703
704 /*
705 * Mark the master side closed. If the slave is still open
706 * mark the tty ZOMBIE, preventing any new action until both
707 * sides have closed.
708 *
709 * NOTE: The ttyflush() will wake up the slave once we've
710 * set appropriate flags. The ZOMBIE flag will be
711 * cleared when the slave side is closed.
712 */
713 pti->pt_flags &= ~PF_MOPEN;
714 if (pti->pt_flags & PF_SOPEN)
715 tp->t_state |= TS_ZOMBIE;
716
717 /*
718 * Turn off the carrier and disconnect. This will notify the slave
719 * side.
720 */
721 if (tp->t_state & TS_ISOPEN) {
722 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
723 ttyflush(tp, FREAD | FWRITE);
724 }
725 tp->t_oproc = NULL; /* mark closed */
726
727 pti->pt_prison = NULL;
728 pti->devs->si_uid = 0;
729 pti->devs->si_gid = 0;
730 pti->devs->si_perms = 0666;
731 pti->devc->si_uid = 0;
732 pti->devc->si_gid = 0;
733 pti->devc->si_perms = 0666;
734
735 pti_done(pti);
736 lwkt_reltoken(&tp->t_token);
737 lwkt_reltoken(&pti->pt_tty.t_token);
738
739 return (0);
740 }
741
742 static int
ptcread(struct dev_read_args * ap)743 ptcread(struct dev_read_args *ap)
744 {
745 cdev_t dev = ap->a_head.a_dev;
746 struct tty *tp = dev->si_tty;
747 struct pt_ioctl *pti = dev->si_drv1;
748 char buf[BUFSIZ];
749 int error = 0, cc;
750
751 lwkt_gettoken(&pti->pt_tty.t_token);
752 lwkt_gettoken(&tp->t_token);
753
754 /*
755 * We want to block until the slave
756 * is open, and there's something to read;
757 * but if we lost the slave or we're NBIO,
758 * then return the appropriate error instead.
759 */
760 for (;;) {
761 if (tp->t_state&TS_ISOPEN) {
762 if ((pti->pt_flags & PF_PKT) && pti->pt_send) {
763 error = ureadc((int)pti->pt_send, ap->a_uio);
764 if (error) {
765 lwkt_reltoken(&tp->t_token);
766 lwkt_reltoken(&pti->pt_tty.t_token);
767 return (error);
768 }
769 if (pti->pt_send & TIOCPKT_IOCTL) {
770 cc = (int)szmin(ap->a_uio->uio_resid,
771 sizeof(tp->t_termios));
772 uiomove((caddr_t)&tp->t_termios, cc,
773 ap->a_uio);
774 }
775 pti->pt_send = 0;
776 lwkt_reltoken(&tp->t_token);
777 lwkt_reltoken(&pti->pt_tty.t_token);
778
779 return (0);
780 }
781 if ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl) {
782 error = ureadc((int)pti->pt_ucntl, ap->a_uio);
783 if (error) {
784 lwkt_reltoken(&tp->t_token);
785 lwkt_reltoken(&pti->pt_tty.t_token);
786 return (error);
787 }
788 pti->pt_ucntl = 0;
789 lwkt_reltoken(&tp->t_token);
790 lwkt_reltoken(&pti->pt_tty.t_token);
791
792 return (0);
793 }
794 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
795 break;
796 }
797 if ((tp->t_state & TS_CONNECTED) == 0) {
798 lwkt_reltoken(&tp->t_token);
799 lwkt_reltoken(&pti->pt_tty.t_token);
800 return (0); /* EOF */
801 }
802 if (ap->a_ioflag & IO_NDELAY) {
803 lwkt_reltoken(&tp->t_token);
804 lwkt_reltoken(&pti->pt_tty.t_token);
805 return (EWOULDBLOCK);
806 }
807 error = tsleep(TSA_PTC_READ(tp), PCATCH, "ptcin", 0);
808 if (error) {
809 lwkt_reltoken(&tp->t_token);
810 lwkt_reltoken(&pti->pt_tty.t_token);
811 return (error);
812 }
813 }
814 if (pti->pt_flags & (PF_PKT|PF_UCNTL))
815 error = ureadc(0, ap->a_uio);
816 while (ap->a_uio->uio_resid > 0 && error == 0) {
817 cc = clist_qtob(&tp->t_outq, buf,
818 (int)szmin(ap->a_uio->uio_resid, BUFSIZ));
819 if (cc <= 0)
820 break;
821 error = uiomove(buf, (size_t)cc, ap->a_uio);
822 }
823 ttwwakeup(tp);
824 lwkt_reltoken(&tp->t_token);
825 lwkt_reltoken(&pti->pt_tty.t_token);
826
827 return (error);
828 }
829
830 static void
ptsstop(struct tty * tp,int flush)831 ptsstop(struct tty *tp, int flush)
832 {
833 struct pt_ioctl *pti = tp->t_dev->si_drv1;
834 int flag;
835
836 lwkt_gettoken(&pti->pt_tty.t_token);
837 /* note: FLUSHREAD and FLUSHWRITE already ok */
838 if (pti) {
839 if (flush == 0) {
840 flush = TIOCPKT_STOP;
841 pti->pt_flags |= PF_STOPPED;
842 } else {
843 pti->pt_flags &= ~PF_STOPPED;
844 }
845 pti->pt_send |= flush;
846 /* change of perspective */
847 }
848 flag = 0;
849 if (flush & FREAD)
850 flag |= FWRITE;
851 if (flush & FWRITE)
852 flag |= FREAD;
853 ptcwakeup(tp, flag);
854
855 lwkt_reltoken(&pti->pt_tty.t_token);
856 }
857
858 /*
859 * ttyunhold() calls us instead of just decrementing tp->t_refs. This
860 * is needed because a session can hold onto a pts (half closed state)
861 * even if there are no live file descriptors. Without the callback
862 * we can't clean up.
863 */
864 static void
ptsunhold(struct tty * tp)865 ptsunhold(struct tty *tp)
866 {
867 struct pt_ioctl *pti = tp->t_dev->si_drv1;
868
869 lwkt_gettoken(&pti->pt_tty.t_token);
870 lwkt_gettoken(&tp->t_token);
871 pti_hold(pti);
872 --tp->t_refs;
873 pti_done(pti);
874 lwkt_reltoken(&tp->t_token);
875 lwkt_reltoken(&pti->pt_tty.t_token);
876 }
877
878 /*
879 * kqueue ops for pseudo-terminals.
880 */
881 static struct filterops ptcread_filtops =
882 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_ptcrdetach, filt_ptcread };
883 static struct filterops ptcwrite_filtops =
884 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_ptcwdetach, filt_ptcwrite };
885
886 static int
ptckqfilter(struct dev_kqfilter_args * ap)887 ptckqfilter(struct dev_kqfilter_args *ap)
888 {
889 cdev_t dev = ap->a_head.a_dev;
890 struct knote *kn = ap->a_kn;
891 struct tty *tp = dev->si_tty;
892 struct klist *klist;
893
894 ap->a_result = 0;
895 switch (kn->kn_filter) {
896 case EVFILT_READ:
897 klist = &tp->t_rkq.ki_note;
898 kn->kn_fop = &ptcread_filtops;
899 break;
900 case EVFILT_WRITE:
901 klist = &tp->t_wkq.ki_note;
902 kn->kn_fop = &ptcwrite_filtops;
903 break;
904 default:
905 ap->a_result = EOPNOTSUPP;
906 return (0);
907 }
908
909 kn->kn_hook = (caddr_t)dev;
910 knote_insert(klist, kn);
911 return (0);
912 }
913
914 static int
filt_ptcread(struct knote * kn,long hint)915 filt_ptcread (struct knote *kn, long hint)
916 {
917 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
918 struct pt_ioctl *pti = ((cdev_t)kn->kn_hook)->si_drv1;
919
920 lwkt_gettoken(&pti->pt_tty.t_token);
921 lwkt_gettoken(&tp->t_token);
922
923 if ((tp->t_state & TS_ZOMBIE) || (pti->pt_flags & PF_SCLOSED)) {
924 kn->kn_flags |= (EV_EOF | EV_NODATA);
925 lwkt_reltoken(&tp->t_token);
926 lwkt_reltoken(&pti->pt_tty.t_token);
927 return (1);
928 }
929
930 if ((tp->t_state & TS_ISOPEN) &&
931 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
932 ((pti->pt_flags & PF_PKT) && pti->pt_send) ||
933 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) {
934 kn->kn_data = tp->t_outq.c_cc;
935 lwkt_reltoken(&tp->t_token);
936 lwkt_reltoken(&pti->pt_tty.t_token);
937 return(1);
938 } else {
939 lwkt_reltoken(&tp->t_token);
940 lwkt_reltoken(&pti->pt_tty.t_token);
941 return(0);
942 }
943 }
944
945 static int
filt_ptcwrite(struct knote * kn,long hint)946 filt_ptcwrite (struct knote *kn, long hint)
947 {
948 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
949 struct pt_ioctl *pti = ((cdev_t)kn->kn_hook)->si_drv1;
950
951 lwkt_gettoken(&pti->pt_tty.t_token);
952 lwkt_gettoken(&tp->t_token);
953 if (tp->t_state & TS_ZOMBIE) {
954 lwkt_reltoken(&tp->t_token);
955 lwkt_reltoken(&pti->pt_tty.t_token);
956 kn->kn_flags |= (EV_EOF | EV_NODATA);
957 return (1);
958 }
959
960 if (tp->t_state & TS_ISOPEN &&
961 ((pti->pt_flags & PF_REMOTE) ?
962 (tp->t_canq.c_cc == 0) :
963 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
964 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) {
965 kn->kn_data = tp->t_canq.c_cc + tp->t_rawq.c_cc;
966 lwkt_reltoken(&tp->t_token);
967 lwkt_reltoken(&pti->pt_tty.t_token);
968 return(1);
969 } else {
970 lwkt_reltoken(&tp->t_token);
971 lwkt_reltoken(&pti->pt_tty.t_token);
972 return(0);
973 }
974 /* NOTREACHED */
975 }
976
977 static void
filt_ptcrdetach(struct knote * kn)978 filt_ptcrdetach (struct knote *kn)
979 {
980 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
981
982 knote_remove(&tp->t_rkq.ki_note, kn);
983 }
984
985 static void
filt_ptcwdetach(struct knote * kn)986 filt_ptcwdetach (struct knote *kn)
987 {
988 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
989
990 knote_remove(&tp->t_wkq.ki_note, kn);
991 }
992
993 /*
994 * I/O ops
995 */
996 static int
ptcwrite(struct dev_write_args * ap)997 ptcwrite(struct dev_write_args *ap)
998 {
999 cdev_t dev = ap->a_head.a_dev;
1000 struct tty *tp = dev->si_tty;
1001 u_char *cp = NULL;
1002 int cc = 0;
1003 u_char locbuf[BUFSIZ];
1004 int cnt = 0;
1005 struct pt_ioctl *pti = dev->si_drv1;
1006 int error = 0;
1007
1008 lwkt_gettoken(&pti->pt_tty.t_token);
1009 lwkt_gettoken(&tp->t_token);
1010 again:
1011 if ((tp->t_state&TS_ISOPEN) == 0)
1012 goto block;
1013 if (pti->pt_flags & PF_REMOTE) {
1014 if (tp->t_canq.c_cc)
1015 goto block;
1016 while ((ap->a_uio->uio_resid > 0 || cc > 0) &&
1017 tp->t_canq.c_cc < TTYHOG - 1) {
1018 if (cc == 0) {
1019 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
1020 cc = imin(cc, TTYHOG - 1 - tp->t_canq.c_cc);
1021 cp = locbuf;
1022 error = uiomove(cp, (size_t)cc, ap->a_uio);
1023 if (error) {
1024 lwkt_reltoken(&tp->t_token);
1025 lwkt_reltoken(&pti->pt_tty.t_token);
1026 return (error);
1027 }
1028 /* check again for safety */
1029 if ((tp->t_state & TS_ISOPEN) == 0) {
1030 /* adjust as usual */
1031 ap->a_uio->uio_resid += cc;
1032 lwkt_reltoken(&tp->t_token);
1033 lwkt_reltoken(&pti->pt_tty.t_token);
1034 return (EIO);
1035 }
1036 }
1037 if (cc > 0) {
1038 cc = clist_btoq((char *)cp, cc, &tp->t_canq);
1039 /*
1040 * XXX we don't guarantee that the canq size
1041 * is >= TTYHOG, so the above btoq() may
1042 * leave some bytes uncopied. However, space
1043 * is guaranteed for the null terminator if
1044 * we don't fail here since (TTYHOG - 1) is
1045 * not a multiple of CBSIZE.
1046 */
1047 if (cc > 0)
1048 break;
1049 }
1050 }
1051 /* adjust for data copied in but not written */
1052 ap->a_uio->uio_resid += cc;
1053 clist_putc(0, &tp->t_canq);
1054 ttwakeup(tp);
1055 wakeup(TSA_PTS_READ(tp));
1056 lwkt_reltoken(&tp->t_token);
1057 lwkt_reltoken(&pti->pt_tty.t_token);
1058
1059 return (0);
1060 }
1061 while (ap->a_uio->uio_resid > 0 || cc > 0) {
1062 if (cc == 0) {
1063 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
1064 cp = locbuf;
1065 error = uiomove(cp, (size_t)cc, ap->a_uio);
1066 if (error) {
1067 lwkt_reltoken(&tp->t_token);
1068 lwkt_reltoken(&pti->pt_tty.t_token);
1069 return (error);
1070 }
1071 /* check again for safety */
1072 if ((tp->t_state & TS_ISOPEN) == 0) {
1073 /* adjust for data copied in but not written */
1074 ap->a_uio->uio_resid += cc;
1075 lwkt_reltoken(&tp->t_token);
1076 lwkt_reltoken(&pti->pt_tty.t_token);
1077 return (EIO);
1078 }
1079 }
1080 while (cc > 0) {
1081 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
1082 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
1083 wakeup(TSA_HUP_OR_INPUT(tp));
1084 goto block;
1085 }
1086 (*linesw[tp->t_line].l_rint)(*cp++, tp);
1087 cnt++;
1088 cc--;
1089 }
1090 cc = 0;
1091 }
1092 lwkt_reltoken(&tp->t_token);
1093 lwkt_reltoken(&pti->pt_tty.t_token);
1094 return (0);
1095 block:
1096 /*
1097 * Come here to wait for slave to open, for space
1098 * in outq, or space in rawq, or an empty canq.
1099 */
1100 if ((tp->t_state & TS_CONNECTED) == 0) {
1101 /* adjust for data copied in but not written */
1102 ap->a_uio->uio_resid += cc;
1103 lwkt_reltoken(&tp->t_token);
1104 lwkt_reltoken(&pti->pt_tty.t_token);
1105 return (EIO);
1106 }
1107 if (ap->a_ioflag & IO_NDELAY) {
1108 /* adjust for data copied in but not written */
1109 ap->a_uio->uio_resid += cc;
1110 if (cnt == 0) {
1111 lwkt_reltoken(&tp->t_token);
1112 lwkt_reltoken(&pti->pt_tty.t_token);
1113 return (EWOULDBLOCK);
1114 }
1115 lwkt_reltoken(&tp->t_token);
1116 lwkt_reltoken(&pti->pt_tty.t_token);
1117 return (0);
1118 }
1119 error = tsleep(TSA_PTC_WRITE(tp), PCATCH, "ptcout", 0);
1120 if (error) {
1121 /* adjust for data copied in but not written */
1122 ap->a_uio->uio_resid += cc;
1123 lwkt_reltoken(&tp->t_token);
1124 lwkt_reltoken(&pti->pt_tty.t_token);
1125 return (error);
1126 }
1127 goto again;
1128 }
1129
1130 /*ARGSUSED*/
1131 static int
ptyioctl(struct dev_ioctl_args * ap)1132 ptyioctl(struct dev_ioctl_args *ap)
1133 {
1134 cdev_t dev = ap->a_head.a_dev;
1135 struct tty *tp = dev->si_tty;
1136 struct pt_ioctl *pti = dev->si_drv1;
1137 u_char *cc = tp->t_cc;
1138 int stop, error;
1139
1140 lwkt_gettoken(&pti->pt_tty.t_token);
1141 lwkt_gettoken(&tp->t_token);
1142
1143 if (dev_dflags(dev) & D_MASTER) {
1144 switch (ap->a_cmd) {
1145
1146 case TIOCGPGRP:
1147 /*
1148 * We avoid calling ttioctl on the controller since,
1149 * in that case, tp must be the controlling terminal.
1150 */
1151 *(int *)ap->a_data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
1152 lwkt_reltoken(&tp->t_token);
1153 lwkt_reltoken(&pti->pt_tty.t_token);
1154 return (0);
1155
1156 case TIOCPKT:
1157 if (*(int *)ap->a_data) {
1158 if (pti->pt_flags & PF_UCNTL) {
1159 lwkt_reltoken(&tp->t_token);
1160 lwkt_reltoken(&pti->pt_tty.t_token);
1161 return (EINVAL);
1162 }
1163 pti->pt_flags |= PF_PKT;
1164 } else {
1165 pti->pt_flags &= ~PF_PKT;
1166 }
1167 lwkt_reltoken(&tp->t_token);
1168 lwkt_reltoken(&pti->pt_tty.t_token);
1169 return (0);
1170
1171 case TIOCUCNTL:
1172 if (*(int *)ap->a_data) {
1173 if (pti->pt_flags & PF_PKT) {
1174 lwkt_reltoken(&tp->t_token);
1175 lwkt_reltoken(&pti->pt_tty.t_token);
1176 return (EINVAL);
1177 }
1178 pti->pt_flags |= PF_UCNTL;
1179 } else {
1180 pti->pt_flags &= ~PF_UCNTL;
1181 }
1182 lwkt_reltoken(&tp->t_token);
1183 lwkt_reltoken(&pti->pt_tty.t_token);
1184 return (0);
1185
1186 case TIOCREMOTE:
1187 if (*(int *)ap->a_data)
1188 pti->pt_flags |= PF_REMOTE;
1189 else
1190 pti->pt_flags &= ~PF_REMOTE;
1191 ttyflush(tp, FREAD|FWRITE);
1192 lwkt_reltoken(&tp->t_token);
1193 lwkt_reltoken(&pti->pt_tty.t_token);
1194 return (0);
1195
1196 case TIOCISPTMASTER:
1197 if ((pti->pt_flags & PF_UNIX98) &&
1198 (pti->devc == dev)) {
1199 lwkt_reltoken(&tp->t_token);
1200 lwkt_reltoken(&pti->pt_tty.t_token);
1201 return (0);
1202 } else {
1203 lwkt_reltoken(&tp->t_token);
1204 lwkt_reltoken(&pti->pt_tty.t_token);
1205 return (EINVAL);
1206 }
1207 }
1208
1209 /*
1210 * The rest of the ioctls shouldn't be called until
1211 * the slave is open.
1212 */
1213 if ((tp->t_state & TS_ISOPEN) == 0) {
1214 lwkt_reltoken(&tp->t_token);
1215 lwkt_reltoken(&pti->pt_tty.t_token);
1216 return (EAGAIN);
1217 }
1218
1219 switch (ap->a_cmd) {
1220 case TIOCSETD:
1221 case TIOCSETA:
1222 case TIOCSETAW:
1223 case TIOCSETAF:
1224 /*
1225 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
1226 * ttywflush(tp) will hang if there are characters in
1227 * the outq.
1228 */
1229 ndflush(&tp->t_outq, tp->t_outq.c_cc);
1230 break;
1231
1232 case TIOCSIG:
1233 if (*(unsigned int *)ap->a_data >= NSIG ||
1234 *(unsigned int *)ap->a_data == 0) {
1235 lwkt_reltoken(&tp->t_token);
1236 lwkt_reltoken(&pti->pt_tty.t_token);
1237 return(EINVAL);
1238 }
1239 if ((tp->t_lflag&NOFLSH) == 0)
1240 ttyflush(tp, FREAD|FWRITE);
1241 pgsignal(tp->t_pgrp, *(unsigned int *)ap->a_data, 1);
1242 if ((*(unsigned int *)ap->a_data == SIGINFO) &&
1243 ((tp->t_lflag&NOKERNINFO) == 0))
1244 ttyinfo(tp);
1245 lwkt_reltoken(&tp->t_token);
1246 lwkt_reltoken(&pti->pt_tty.t_token);
1247 return(0);
1248 }
1249 }
1250 if (ap->a_cmd == TIOCEXT) {
1251 /*
1252 * When the EXTPROC bit is being toggled, we need
1253 * to send an TIOCPKT_IOCTL if the packet driver
1254 * is turned on.
1255 */
1256 if (*(int *)ap->a_data) {
1257 if (pti->pt_flags & PF_PKT) {
1258 pti->pt_send |= TIOCPKT_IOCTL;
1259 ptcwakeup(tp, FREAD);
1260 }
1261 tp->t_lflag |= EXTPROC;
1262 } else {
1263 if ((tp->t_lflag & EXTPROC) &&
1264 (pti->pt_flags & PF_PKT)) {
1265 pti->pt_send |= TIOCPKT_IOCTL;
1266 ptcwakeup(tp, FREAD);
1267 }
1268 tp->t_lflag &= ~EXTPROC;
1269 }
1270 lwkt_reltoken(&tp->t_token);
1271 lwkt_reltoken(&pti->pt_tty.t_token);
1272 return(0);
1273 }
1274 error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
1275 ap->a_fflag, ap->a_cred);
1276 if (error == ENOIOCTL)
1277 error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
1278 if (error == ENOIOCTL) {
1279 if (pti->pt_flags & PF_UCNTL &&
1280 (ap->a_cmd & ~0xff) == UIOCCMD(0)) {
1281 if (ap->a_cmd & 0xff) {
1282 pti->pt_ucntl = (u_char)ap->a_cmd;
1283 ptcwakeup(tp, FREAD);
1284 }
1285 lwkt_reltoken(&tp->t_token);
1286 lwkt_reltoken(&pti->pt_tty.t_token);
1287 return (0);
1288 }
1289 error = ENOTTY;
1290 }
1291 /*
1292 * If external processing and packet mode send ioctl packet.
1293 */
1294 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
1295 switch(ap->a_cmd) {
1296 case TIOCSETA:
1297 case TIOCSETAW:
1298 case TIOCSETAF:
1299 pti->pt_send |= TIOCPKT_IOCTL;
1300 ptcwakeup(tp, FREAD);
1301 default:
1302 break;
1303 }
1304 }
1305 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
1306 && CCEQ(cc[VSTART], CTRL('q'));
1307 if (pti->pt_flags & PF_NOSTOP) {
1308 if (stop) {
1309 pti->pt_send &= ~TIOCPKT_NOSTOP;
1310 pti->pt_send |= TIOCPKT_DOSTOP;
1311 pti->pt_flags &= ~PF_NOSTOP;
1312 ptcwakeup(tp, FREAD);
1313 }
1314 } else {
1315 if (!stop) {
1316 pti->pt_send &= ~TIOCPKT_DOSTOP;
1317 pti->pt_send |= TIOCPKT_NOSTOP;
1318 pti->pt_flags |= PF_NOSTOP;
1319 ptcwakeup(tp, FREAD);
1320 }
1321 }
1322 lwkt_reltoken(&tp->t_token);
1323 lwkt_reltoken(&pti->pt_tty.t_token);
1324
1325 return (error);
1326 }
1327
1328
1329 static void ptc_drvinit (void *unused);
1330
1331 SYSCTL_INT(_kern, OID_AUTO, pty_debug, CTLFLAG_RW, &pty_debug_level,
1332 0, "Change pty debug level");
1333
1334 static void
ptc_drvinit(void * unused)1335 ptc_drvinit(void *unused)
1336 {
1337 int i;
1338
1339 /*
1340 * Unix98 pty stuff.
1341 * Create the clonable base device.
1342 */
1343 make_autoclone_dev(&ptc_ops, &DEVFS_CLONE_BITMAP(pty), ptyclone,
1344 0, 0, 0666, "ptmx");
1345 ptis = kmalloc(sizeof(struct pt_ioctl *) * MAXPTYS, M_PTY,
1346 M_WAITOK | M_ZERO);
1347
1348 for (i = 0; i < 256; i++) {
1349 ptyinit(i);
1350 }
1351 }
1352
1353 SYSINIT(ptcdev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE + CDEV_MAJOR_C,
1354 ptc_drvinit, NULL);
1355