1 | /* |
2 | * Copyright (c) 1997-2013 Apple Inc. All rights reserved. |
3 | * |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
5 | * |
6 | * This file contains Original Code and/or Modifications of Original Code |
7 | * as defined in and that are subject to the Apple Public Source License |
8 | * Version 2.0 (the 'License'). You may not use this file except in |
9 | * compliance with the License. The rights granted to you under the License |
10 | * may not be used to create, or enable the creation or redistribution of, |
11 | * unlawful or unlicensed copies of an Apple operating system, or to |
12 | * circumvent, violate, or enable the circumvention or violation of, any |
13 | * terms of an Apple operating system software license agreement. |
14 | * |
15 | * Please obtain a copy of the License at |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. |
17 | * |
18 | * The Original Code and all software distributed under the License are |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
23 | * Please see the License for the specific language governing rights and |
24 | * limitations under the License. |
25 | * |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
27 | */ |
28 | /* |
29 | * Copyright (c) 1982, 1986, 1989, 1993 |
30 | * The Regents of the University of California. All rights reserved. |
31 | * |
32 | * Redistribution and use in source and binary forms, with or without |
33 | * modification, are permitted provided that the following conditions |
34 | * are met: |
35 | * 1. Redistributions of source code must retain the above copyright |
36 | * notice, this list of conditions and the following disclaimer. |
37 | * 2. Redistributions in binary form must reproduce the above copyright |
38 | * notice, this list of conditions and the following disclaimer in the |
39 | * documentation and/or other materials provided with the distribution. |
40 | * 3. All advertising materials mentioning features or use of this software |
41 | * must display the following acknowledgement: |
42 | * This product includes software developed by the University of |
43 | * California, Berkeley and its contributors. |
44 | * 4. Neither the name of the University nor the names of its contributors |
45 | * may be used to endorse or promote products derived from this software |
46 | * without specific prior written permission. |
47 | * |
48 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
49 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
50 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
51 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
52 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
53 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
54 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
55 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
56 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
57 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
58 | * SUCH DAMAGE. |
59 | * |
60 | * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95 |
61 | */ |
62 | |
63 | /* Common callbacks for the pseudo-teletype driver (pty/tty) |
64 | * and cloning pseudo-teletype driver (ptmx/pts). |
65 | */ |
66 | |
67 | #include <sys/param.h> |
68 | #include <sys/systm.h> |
69 | #include <sys/ioctl.h> |
70 | #include <sys/proc_internal.h> |
71 | #include <sys/kauth.h> |
72 | #include <sys/tty.h> |
73 | #include <sys/conf.h> |
74 | #include <sys/file_internal.h> |
75 | #include <sys/uio_internal.h> |
76 | #include <sys/kernel.h> |
77 | #include <sys/vnode.h> |
78 | #include <sys/vnode_internal.h> /* _devfs_setattr() */ |
79 | #include <sys/stat.h> /* _devfs_setattr() */ |
80 | #include <sys/user.h> |
81 | #include <sys/signalvar.h> |
82 | #include <sys/sysctl.h> |
83 | #include <miscfs/devfs/devfs.h> |
84 | #include <miscfs/devfs/devfsdefs.h> /* DEVFS_LOCK()/DEVFS_UNLOCK() */ |
85 | |
86 | #if CONFIG_MACF |
87 | #include <security/mac_framework.h> |
88 | #endif |
89 | |
90 | #include "tty_dev.h" |
91 | |
92 | /* XXX belongs in devfs somewhere - LATER */ |
93 | static int _devfs_setattr(void *, unsigned short, uid_t, gid_t); |
94 | |
95 | /* |
96 | * Forward declarations |
97 | */ |
98 | static void ptcwakeup(struct tty *tp, int flag); |
99 | __XNU_PRIVATE_EXTERN d_open_t ptsopen; |
100 | __XNU_PRIVATE_EXTERN d_close_t ptsclose; |
101 | __XNU_PRIVATE_EXTERN d_read_t ptsread; |
102 | __XNU_PRIVATE_EXTERN d_write_t ptswrite; |
103 | __XNU_PRIVATE_EXTERN d_ioctl_t ptyioctl; /* common ioctl */ |
104 | __XNU_PRIVATE_EXTERN d_stop_t ptsstop; |
105 | __XNU_PRIVATE_EXTERN d_reset_t ptsreset; |
106 | __XNU_PRIVATE_EXTERN d_select_t ptsselect; |
107 | __XNU_PRIVATE_EXTERN d_open_t ptcopen; |
108 | __XNU_PRIVATE_EXTERN d_close_t ptcclose; |
109 | __XNU_PRIVATE_EXTERN d_read_t ptcread; |
110 | __XNU_PRIVATE_EXTERN d_write_t ptcwrite; |
111 | __XNU_PRIVATE_EXTERN d_stop_t ptcstop; /* NO-OP */ |
112 | __XNU_PRIVATE_EXTERN d_reset_t ptcreset; |
113 | __XNU_PRIVATE_EXTERN d_select_t ptcselect; |
114 | |
115 | /* |
116 | * XXX Should be devfs function... and use VATTR mechanisms, per |
117 | * XXX vnode_setattr2(); only we maybe can't really get back to the |
118 | * XXX vnode here for cloning devices (but it works for *cloned* devices |
119 | * XXX that are not themselves cloning). |
120 | * |
121 | * Returns: 0 Success |
122 | * namei:??? |
123 | * vnode_setattr:??? |
124 | */ |
125 | static int |
126 | _devfs_setattr(void * handle, unsigned short mode, uid_t uid, gid_t gid) |
127 | { |
128 | devdirent_t *direntp = (devdirent_t *)handle; |
129 | devnode_t *devnodep; |
130 | int error = EACCES; |
131 | vfs_context_t ctx = vfs_context_current();; |
132 | struct vnode_attr va; |
133 | |
134 | VATTR_INIT(&va); |
135 | VATTR_SET(&va, va_uid, uid); |
136 | VATTR_SET(&va, va_gid, gid); |
137 | VATTR_SET(&va, va_mode, mode & ALLPERMS); |
138 | |
139 | /* |
140 | * If the TIOCPTYGRANT loses the race with the clone operation because |
141 | * this function is not part of devfs, and therefore can't take the |
142 | * devfs lock to protect the direntp update, then force user space to |
143 | * redrive the grant request. |
144 | */ |
145 | if (direntp == NULL || (devnodep = direntp->de_dnp) == NULL) { |
146 | error = ERESTART; |
147 | goto out; |
148 | } |
149 | |
150 | /* |
151 | * Only do this if we are operating on device that doesn't clone |
152 | * each time it's referenced. We perform a lookup on the device |
153 | * to insure we get the right instance. We can't just use the call |
154 | * to devfs_dntovn() to get the vp for the operation, because |
155 | * dn_dvm may not have been initialized. |
156 | */ |
157 | if (devnodep->dn_clone == NULL) { |
158 | struct nameidata nd; |
159 | char name[128]; |
160 | |
161 | snprintf(name, sizeof(name), "/dev/%s" , direntp->de_name); |
162 | NDINIT(&nd, LOOKUP, OP_SETATTR, FOLLOW, UIO_SYSSPACE, CAST_USER_ADDR_T(name), ctx); |
163 | error = namei(&nd); |
164 | if (error) |
165 | goto out; |
166 | error = vnode_setattr(nd.ni_vp, &va, ctx); |
167 | vnode_put(nd.ni_vp); |
168 | nameidone(&nd); |
169 | goto out; |
170 | } |
171 | |
172 | out: |
173 | return(error); |
174 | } |
175 | |
176 | #define BUFSIZ 100 /* Chunk size iomoved to/from user */ |
177 | |
178 | static struct tty_dev_t *tty_dev_head; |
179 | |
180 | __private_extern__ void |
181 | tty_dev_register(struct tty_dev_t *driver) |
182 | { |
183 | if (driver) { |
184 | driver->next = tty_dev_head; |
185 | tty_dev_head = driver; |
186 | } |
187 | } |
188 | |
189 | /* |
190 | * Given a minor number, return the corresponding structure for that minor |
191 | * number. If there isn't one, and the create flag is specified, we create |
192 | * one if possible. |
193 | * |
194 | * Parameters: minor Minor number of ptmx device |
195 | * open_flag PF_OPEN_M First open of master |
196 | * PF_OPEN_S First open of slave |
197 | * 0 Just want ioctl struct |
198 | * |
199 | * Returns: NULL Did not exist/could not create |
200 | * !NULL structure corresponding minor number |
201 | * |
202 | * Locks: tty_lock() on ptmx_ioctl->pt_tty NOT held on entry or exit. |
203 | */ |
204 | |
205 | static struct tty_dev_t * |
206 | pty_get_driver(dev_t dev) |
207 | { |
208 | int major = major(dev); |
209 | struct tty_dev_t *driver; |
210 | for (driver = tty_dev_head; driver != NULL; driver = driver->next) { |
211 | if ((driver->master == major || driver->slave == major)) { |
212 | break; |
213 | } |
214 | } |
215 | return driver; |
216 | } |
217 | |
218 | static struct ptmx_ioctl * |
219 | pty_get_ioctl(dev_t dev, int open_flag, struct tty_dev_t **out_driver) |
220 | { |
221 | struct tty_dev_t *driver = pty_get_driver(dev); |
222 | if (out_driver) { |
223 | *out_driver = driver; |
224 | } |
225 | if (driver && driver->open) { |
226 | return driver->open(minor(dev), open_flag); |
227 | } |
228 | return NULL; |
229 | } |
230 | |
231 | /* |
232 | * Locks: tty_lock() of old_ptmx_ioctl->pt_tty NOT held for this call. |
233 | */ |
234 | static int |
235 | pty_free_ioctl(dev_t dev, int open_flag) |
236 | { |
237 | struct tty_dev_t *driver = pty_get_driver(dev); |
238 | if (driver && driver->free) { |
239 | return driver->free(minor(dev), open_flag); |
240 | } |
241 | return 0; |
242 | } |
243 | |
244 | static int |
245 | pty_get_name(dev_t dev, char *buffer, size_t size) |
246 | { |
247 | struct tty_dev_t *driver = pty_get_driver(dev); |
248 | if (driver && driver->name) { |
249 | return driver->name(minor(dev), buffer, size); |
250 | } |
251 | return 0; |
252 | } |
253 | |
254 | __private_extern__ int |
255 | ptsopen(dev_t dev, int flag, __unused int devtype, __unused struct proc *p) |
256 | { |
257 | int error; |
258 | struct tty_dev_t *driver; |
259 | struct ptmx_ioctl *pti = pty_get_ioctl(dev, PF_OPEN_S, &driver); |
260 | if (pti == NULL) { |
261 | return ENXIO; |
262 | } |
263 | if (!(pti->pt_flags & PF_UNLOCKED)) { |
264 | return EAGAIN; |
265 | } |
266 | |
267 | struct tty *tp = pti->pt_tty; |
268 | tty_lock(tp); |
269 | |
270 | if ((tp->t_state & TS_ISOPEN) == 0) { |
271 | termioschars(&tp->t_termios); /* Set up default chars */ |
272 | tp->t_iflag = TTYDEF_IFLAG; |
273 | tp->t_oflag = TTYDEF_OFLAG; |
274 | tp->t_lflag = TTYDEF_LFLAG; |
275 | tp->t_cflag = TTYDEF_CFLAG; |
276 | tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; |
277 | ttsetwater(tp); /* would be done in xxparam() */ |
278 | } else if ((tp->t_state & TS_XCLUDE) && kauth_cred_issuser(kauth_cred_get())) { |
279 | error = EBUSY; |
280 | goto out; |
281 | } |
282 | if (tp->t_oproc) /* Ctrlr still around. */ |
283 | (void)(*linesw[tp->t_line].l_modem)(tp, 1); |
284 | while ((tp->t_state & TS_CARR_ON) == 0) { |
285 | if (flag&FNONBLOCK) |
286 | break; |
287 | error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, __FUNCTION__, 0); |
288 | if (error) |
289 | goto out; |
290 | } |
291 | error = (*linesw[tp->t_line].l_open)(dev, tp); |
292 | /* Successful open; mark as open by the slave */ |
293 | |
294 | pti->pt_flags |= PF_OPEN_S; |
295 | CLR(tp->t_state, TS_IOCTL_NOT_OK); |
296 | if (error == 0) |
297 | ptcwakeup(tp, FREAD|FWRITE); |
298 | |
299 | out: |
300 | tty_unlock(tp); |
301 | return (error); |
302 | } |
303 | |
304 | __private_extern__ int |
305 | ptsclose(dev_t dev, int flag, __unused int mode, __unused proc_t p) |
306 | { |
307 | int err; |
308 | |
309 | /* |
310 | * This is temporary until the VSX conformance tests |
311 | * are fixed. They are hanging with a deadlock |
312 | * where close() will not complete without t_timeout set |
313 | */ |
314 | #define FIX_VSX_HANG 1 |
315 | #ifdef FIX_VSX_HANG |
316 | int save_timeout; |
317 | #endif |
318 | struct tty_dev_t *driver; |
319 | struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, &driver); |
320 | struct tty *tp; |
321 | |
322 | if (pti == NULL) |
323 | return (ENXIO); |
324 | |
325 | tp = pti->pt_tty; |
326 | tty_lock(tp); |
327 | #ifdef FIX_VSX_HANG |
328 | save_timeout = tp->t_timeout; |
329 | tp->t_timeout = 60; |
330 | #endif |
331 | /* |
332 | * Close the line discipline and backing TTY structures. |
333 | */ |
334 | err = (*linesw[tp->t_line].l_close)(tp, flag); |
335 | (void)ttyclose(tp); |
336 | |
337 | /* |
338 | * Flush data and notify any waiters on the master side of this PTY. |
339 | */ |
340 | ptsstop(tp, FREAD | FWRITE); |
341 | #ifdef FIX_VSX_HANG |
342 | tp->t_timeout = save_timeout; |
343 | #endif |
344 | tty_unlock(tp); |
345 | |
346 | if ((flag & IO_REVOKE) == IO_REVOKE && driver->revoke) { |
347 | driver->revoke(minor(dev), tp); |
348 | } |
349 | /* unconditional, just like ttyclose() */ |
350 | pty_free_ioctl(dev, PF_OPEN_S); |
351 | |
352 | return (err); |
353 | } |
354 | |
355 | __private_extern__ int |
356 | ptsread(dev_t dev, struct uio *uio, int flag) |
357 | { |
358 | proc_t p = current_proc(); |
359 | struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, NULL); |
360 | struct tty *tp; |
361 | int error = 0; |
362 | struct uthread *ut; |
363 | struct pgrp *pg; |
364 | |
365 | if (pti == NULL) |
366 | return (ENXIO); |
367 | tp = pti->pt_tty; |
368 | tty_lock(tp); |
369 | |
370 | ut = (struct uthread *)get_bsdthread_info(current_thread()); |
371 | again: |
372 | if (pti->pt_flags & PF_REMOTE) { |
373 | while (isbackground(p, tp)) { |
374 | if ((p->p_sigignore & sigmask(SIGTTIN)) || |
375 | (ut->uu_sigmask & sigmask(SIGTTIN)) || |
376 | p->p_lflag & P_LPPWAIT) { |
377 | error = EIO; |
378 | goto out; |
379 | } |
380 | |
381 | |
382 | pg = proc_pgrp(p); |
383 | if (pg == PGRP_NULL) { |
384 | error = EIO; |
385 | goto out; |
386 | } |
387 | /* |
388 | * SAFE: We about to drop the lock ourselves by |
389 | * SAFE: erroring out or sleeping anyway. |
390 | */ |
391 | tty_unlock(tp); |
392 | if (pg->pg_jobc == 0) { |
393 | pg_rele(pg); |
394 | tty_lock(tp); |
395 | error = EIO; |
396 | goto out; |
397 | } |
398 | pgsignal(pg, SIGTTIN, 1); |
399 | pg_rele(pg); |
400 | tty_lock(tp); |
401 | |
402 | error = ttysleep(tp, &ptsread, TTIPRI | PCATCH | PTTYBLOCK, __FUNCTION__, hz); |
403 | if (error) |
404 | goto out; |
405 | } |
406 | if (tp->t_canq.c_cc == 0) { |
407 | if (flag & IO_NDELAY) { |
408 | error = EWOULDBLOCK; |
409 | goto out; |
410 | } |
411 | error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, __FUNCTION__, 0); |
412 | if (error) |
413 | goto out; |
414 | goto again; |
415 | } |
416 | while (tp->t_canq.c_cc > 1 && uio_resid(uio) > 0) { |
417 | int cc; |
418 | char buf[BUFSIZ]; |
419 | |
420 | cc = MIN((int)uio_resid(uio), BUFSIZ); |
421 | // Don't copy the very last byte |
422 | cc = MIN(cc, tp->t_canq.c_cc - 1); |
423 | cc = q_to_b(&tp->t_canq, (u_char *)buf, cc); |
424 | error = uiomove(buf, cc, uio); |
425 | if (error) |
426 | break; |
427 | } |
428 | if (tp->t_canq.c_cc == 1) |
429 | (void) getc(&tp->t_canq); |
430 | if (tp->t_canq.c_cc) |
431 | goto out; |
432 | } else |
433 | if (tp->t_oproc) |
434 | error = (*linesw[tp->t_line].l_read)(tp, uio, flag); |
435 | ptcwakeup(tp, FWRITE); |
436 | out: |
437 | tty_unlock(tp); |
438 | return (error); |
439 | } |
440 | |
441 | /* |
442 | * Write to pseudo-tty. |
443 | * Wakeups of controlling tty will happen |
444 | * indirectly, when tty driver calls ptsstart. |
445 | */ |
446 | __private_extern__ int |
447 | ptswrite(dev_t dev, struct uio *uio, int flag) |
448 | { |
449 | struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, NULL); |
450 | struct tty *tp; |
451 | int error; |
452 | |
453 | if (pti == NULL) |
454 | return (ENXIO); |
455 | tp = pti->pt_tty; |
456 | tty_lock(tp); |
457 | |
458 | if (tp->t_oproc == 0) |
459 | error = EIO; |
460 | else |
461 | error = (*linesw[tp->t_line].l_write)(tp, uio, flag); |
462 | |
463 | tty_unlock(tp); |
464 | |
465 | return (error); |
466 | } |
467 | |
468 | /* |
469 | * Start output on pseudo-tty. |
470 | * Wake up process selecting or sleeping for input from controlling tty. |
471 | * |
472 | * t_oproc for this driver; called from within the line discipline |
473 | * |
474 | * Locks: Assumes tp is locked on entry, remains locked on exit |
475 | */ |
476 | static void |
477 | ptsstart(struct tty *tp) |
478 | { |
479 | struct ptmx_ioctl *pti = pty_get_ioctl(tp->t_dev, 0, NULL); |
480 | if (pti == NULL) |
481 | goto out; |
482 | if (tp->t_state & TS_TTSTOP) |
483 | goto out; |
484 | if (pti->pt_flags & PF_STOPPED) { |
485 | pti->pt_flags &= ~PF_STOPPED; |
486 | pti->pt_send = TIOCPKT_START; |
487 | } |
488 | ptcwakeup(tp, FREAD); |
489 | out: |
490 | return; |
491 | } |
492 | |
493 | /* |
494 | * Locks: Assumes tty_lock() is held over this call. |
495 | */ |
496 | static void |
497 | ptcwakeup(struct tty *tp, int flag) |
498 | { |
499 | struct ptmx_ioctl *pti = pty_get_ioctl(tp->t_dev, 0, NULL); |
500 | if (pti == NULL) |
501 | return; |
502 | |
503 | if (flag & FREAD) { |
504 | selwakeup(&pti->pt_selr); |
505 | wakeup(TSA_PTC_READ(tp)); |
506 | KNOTE(&pti->pt_selr.si_note, 1); |
507 | } |
508 | if (flag & FWRITE) { |
509 | selwakeup(&pti->pt_selw); |
510 | wakeup(TSA_PTC_WRITE(tp)); |
511 | KNOTE(&pti->pt_selw.si_note, 1); |
512 | } |
513 | } |
514 | |
515 | __private_extern__ int |
516 | ptcopen(dev_t dev, __unused int flag, __unused int devtype, __unused proc_t p) |
517 | { |
518 | struct tty_dev_t *driver; |
519 | struct ptmx_ioctl *pti = pty_get_ioctl(dev, PF_OPEN_M, &driver); |
520 | if (pti == NULL) { |
521 | return (ENXIO); |
522 | } else if (pti == (struct ptmx_ioctl*)-1) { |
523 | return (EREDRIVEOPEN); |
524 | } |
525 | |
526 | struct tty *tp = pti->pt_tty; |
527 | tty_lock(tp); |
528 | |
529 | /* If master is open OR slave is still draining, pty is still busy */ |
530 | if (tp->t_oproc || (tp->t_state & TS_ISOPEN)) { |
531 | tty_unlock(tp); |
532 | /* |
533 | * If master is closed, we are the only reference, so we |
534 | * need to clear the master open bit |
535 | */ |
536 | if (!tp->t_oproc) { |
537 | pty_free_ioctl(dev, PF_OPEN_M); |
538 | } |
539 | return EBUSY; |
540 | } |
541 | tp->t_oproc = ptsstart; |
542 | CLR(tp->t_state, TS_ZOMBIE); |
543 | SET(tp->t_state, TS_IOCTL_NOT_OK); |
544 | #ifdef sun4c |
545 | tp->t_stop = ptsstop; |
546 | #endif |
547 | (void)(*linesw[tp->t_line].l_modem)(tp, 1); |
548 | tp->t_lflag &= ~EXTPROC; |
549 | |
550 | if (driver->open_reset) { |
551 | pti->pt_flags = PF_UNLOCKED; |
552 | pti->pt_send = 0; |
553 | pti->pt_ucntl = 0; |
554 | } |
555 | |
556 | tty_unlock(tp); |
557 | return 0; |
558 | } |
559 | |
560 | __private_extern__ int |
561 | ptcclose(dev_t dev, __unused int flags, __unused int fmt, __unused proc_t p) |
562 | { |
563 | struct tty_dev_t *driver; |
564 | struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, &driver); |
565 | struct tty *tp; |
566 | struct knote *kn; |
567 | |
568 | if (!pti) { |
569 | return ENXIO; |
570 | } |
571 | |
572 | tp = pti->pt_tty; |
573 | tty_lock(tp); |
574 | |
575 | /* |
576 | * XXX MDMBUF makes no sense for PTYs, but would inhibit an `l_modem`. |
577 | * CLOCAL makes sense but isn't supported. Special `l_modem`s that ignore |
578 | * carrier drop make no sense for PTYs but may be in use because other parts |
579 | * of the line discipline make sense for PTYs. Recover by doing everything |
580 | * that a normal `ttymodem` would have done except for sending SIGHUP. |
581 | */ |
582 | (void)(*linesw[tp->t_line].l_modem)(tp, 0); |
583 | if (tp->t_state & TS_ISOPEN) { |
584 | tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); |
585 | tp->t_state |= TS_ZOMBIE; |
586 | ttyflush(tp, FREAD | FWRITE); |
587 | } |
588 | |
589 | /* |
590 | * Null out the backing TTY struct's open procedure to prevent starting |
591 | * slaves through `ptsstart`. |
592 | */ |
593 | tp->t_oproc = NULL; |
594 | |
595 | /* |
596 | * Clear any select or kevent waiters under the lock. |
597 | */ |
598 | SLIST_FOREACH(kn, &pti->pt_selr.si_note, kn_selnext) { |
599 | KNOTE_DETACH(&pti->pt_selr.si_note, kn); |
600 | } |
601 | selthreadclear(&pti->pt_selr); |
602 | SLIST_FOREACH(kn, &pti->pt_selw.si_note, kn_selnext) { |
603 | KNOTE_DETACH(&pti->pt_selw.si_note, kn); |
604 | } |
605 | selthreadclear(&pti->pt_selw); |
606 | |
607 | tty_unlock(tp); |
608 | |
609 | pty_free_ioctl(dev, PF_OPEN_M); |
610 | #if CONFIG_MACF |
611 | if (driver->mac_notify) { |
612 | mac_pty_notify_close(p, tp, dev, NULL); |
613 | } |
614 | #endif |
615 | |
616 | return (0); |
617 | } |
618 | |
619 | __private_extern__ int |
620 | ptcread(dev_t dev, struct uio *uio, int flag) |
621 | { |
622 | struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, NULL); |
623 | struct tty *tp; |
624 | char buf[BUFSIZ]; |
625 | int error = 0, cc; |
626 | |
627 | if (pti == NULL) |
628 | return (ENXIO); |
629 | tp = pti->pt_tty; |
630 | tty_lock(tp); |
631 | |
632 | /* |
633 | * We want to block until the slave |
634 | * is open, and there's something to read; |
635 | * but if we lost the slave or we're NBIO, |
636 | * then return the appropriate error instead. |
637 | */ |
638 | for (;;) { |
639 | if (tp->t_state & TS_ISOPEN) { |
640 | if (pti->pt_flags & PF_PKT && pti->pt_send) { |
641 | error = ureadc((int)pti->pt_send, uio); |
642 | if (error) |
643 | goto out; |
644 | if (pti->pt_send & TIOCPKT_IOCTL) { |
645 | cc = MIN((int)uio_resid(uio), |
646 | (int)sizeof(tp->t_termios)); |
647 | uiomove((caddr_t)&tp->t_termios, cc, |
648 | uio); |
649 | } |
650 | pti->pt_send = 0; |
651 | goto out; |
652 | } |
653 | if (pti->pt_flags & PF_UCNTL && pti->pt_ucntl) { |
654 | error = ureadc((int)pti->pt_ucntl, uio); |
655 | if (error) |
656 | goto out; |
657 | pti->pt_ucntl = 0; |
658 | goto out; |
659 | } |
660 | if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) |
661 | break; |
662 | } |
663 | if ((tp->t_state & TS_CONNECTED) == 0) |
664 | goto out; /* EOF */ |
665 | if (flag & IO_NDELAY) { |
666 | error = EWOULDBLOCK; |
667 | goto out; |
668 | } |
669 | error = ttysleep(tp, TSA_PTC_READ(tp), TTIPRI | PCATCH, __FUNCTION__, 0); |
670 | if (error) |
671 | goto out; |
672 | } |
673 | if (pti->pt_flags & (PF_PKT|PF_UCNTL)) |
674 | error = ureadc(0, uio); |
675 | while (uio_resid(uio) > 0 && error == 0) { |
676 | cc = q_to_b(&tp->t_outq, (u_char *)buf, MIN((int)uio_resid(uio), BUFSIZ)); |
677 | if (cc <= 0) |
678 | break; |
679 | error = uiomove(buf, cc, uio); |
680 | } |
681 | (*linesw[tp->t_line].l_start)(tp); |
682 | |
683 | out: |
684 | tty_unlock(tp); |
685 | |
686 | return (error); |
687 | } |
688 | |
689 | /* |
690 | * Line discipline callback |
691 | * |
692 | * Locks: tty_lock() is assumed held on entry and exit. |
693 | */ |
694 | __private_extern__ int |
695 | ptsstop(struct tty* tp, int flush) |
696 | { |
697 | struct ptmx_ioctl *pti = pty_get_ioctl(tp->t_dev, 0, NULL); |
698 | int flag; |
699 | |
700 | if (pti == NULL) |
701 | return (ENXIO); |
702 | |
703 | /* note: FLUSHREAD and FLUSHWRITE already ok */ |
704 | if (flush == 0) { |
705 | flush = TIOCPKT_STOP; |
706 | pti->pt_flags |= PF_STOPPED; |
707 | } else |
708 | pti->pt_flags &= ~PF_STOPPED; |
709 | pti->pt_send |= flush; |
710 | /* change of perspective */ |
711 | flag = 0; |
712 | if (flush & FREAD) |
713 | flag |= FWRITE; |
714 | if (flush & FWRITE) |
715 | flag |= FREAD; |
716 | ptcwakeup(tp, flag); |
717 | return 0; |
718 | } |
719 | |
720 | __private_extern__ int |
721 | ptsreset(__unused int uban) |
722 | { |
723 | return (0); |
724 | } |
725 | |
726 | int |
727 | ptsselect(dev_t dev, int rw, void *wql, proc_t p) |
728 | { |
729 | struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, NULL); |
730 | struct tty *tp; |
731 | int retval = 0; |
732 | |
733 | if (pti == NULL) |
734 | return (ENXIO); |
735 | tp = pti->pt_tty; |
736 | if (tp == NULL) |
737 | return (ENXIO); |
738 | |
739 | tty_lock(tp); |
740 | |
741 | switch (rw) { |
742 | case FREAD: |
743 | if (ISSET(tp->t_state, TS_ZOMBIE)) { |
744 | retval = 1; |
745 | break; |
746 | } |
747 | |
748 | retval = ttnread(tp); |
749 | if (retval > 0) { |
750 | break; |
751 | } |
752 | |
753 | selrecord(p, &tp->t_rsel, wql); |
754 | break; |
755 | case FWRITE: |
756 | if (ISSET(tp->t_state, TS_ZOMBIE)) { |
757 | retval = 1; |
758 | break; |
759 | } |
760 | |
761 | if ((tp->t_outq.c_cc <= tp->t_lowat) && |
762 | ISSET(tp->t_state, TS_CONNECTED)) { |
763 | retval = tp->t_hiwat - tp->t_outq.c_cc; |
764 | break; |
765 | } |
766 | |
767 | selrecord(p, &tp->t_wsel, wql); |
768 | break; |
769 | } |
770 | |
771 | tty_unlock(tp); |
772 | return (retval); |
773 | } |
774 | |
775 | __private_extern__ int |
776 | ptcselect(dev_t dev, int rw, void *wql, proc_t p) |
777 | { |
778 | struct tty_dev_t *driver; |
779 | struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, &driver); |
780 | struct tty *tp; |
781 | int retval = 0; |
782 | |
783 | if (pti == NULL) |
784 | return (ENXIO); |
785 | tp = pti->pt_tty; |
786 | tty_lock(tp); |
787 | |
788 | if ((tp->t_state & TS_CONNECTED) == 0) { |
789 | retval = 1; |
790 | goto out; |
791 | } |
792 | switch (rw) { |
793 | |
794 | case FREAD: |
795 | /* |
796 | * Need to block timeouts (ttrstart). |
797 | */ |
798 | if ((tp->t_state&TS_ISOPEN) && |
799 | tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) { |
800 | retval = (driver->fix_7828447) ? tp->t_outq.c_cc : 1; |
801 | break; |
802 | } |
803 | /* FALLTHROUGH */ |
804 | |
805 | case 0: /* exceptional */ |
806 | if ((tp->t_state&TS_ISOPEN) && |
807 | (((pti->pt_flags & PF_PKT) && pti->pt_send) || |
808 | ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) { |
809 | retval = 1; |
810 | break; |
811 | } |
812 | selrecord(p, &pti->pt_selr, wql); |
813 | break; |
814 | |
815 | |
816 | case FWRITE: |
817 | if (tp->t_state&TS_ISOPEN) { |
818 | if (pti->pt_flags & PF_REMOTE) { |
819 | if (tp->t_canq.c_cc == 0) { |
820 | retval = (driver->fix_7828447) ? (TTYHOG - 1) : 1; |
821 | break; |
822 | } |
823 | } else { |
824 | retval = (TTYHOG - 2) - (tp->t_rawq.c_cc + tp->t_canq.c_cc); |
825 | if (retval > 0) { |
826 | retval = (driver->fix_7828447) ? retval : 1; |
827 | break; |
828 | } |
829 | if (tp->t_canq.c_cc == 0 && (tp->t_lflag&ICANON)) { |
830 | retval = 1; |
831 | break; |
832 | } |
833 | retval = 0; |
834 | } |
835 | } |
836 | selrecord(p, &pti->pt_selw, wql); |
837 | break; |
838 | |
839 | } |
840 | out: |
841 | tty_unlock(tp); |
842 | |
843 | return (retval); |
844 | } |
845 | |
846 | __private_extern__ int |
847 | ptcstop(__unused struct tty *tp, __unused int flush) |
848 | { |
849 | return (0); |
850 | } |
851 | |
852 | __private_extern__ int |
853 | ptcreset(__unused int uban) |
854 | { |
855 | return (0); |
856 | } |
857 | |
858 | __private_extern__ int |
859 | ptcwrite(dev_t dev, struct uio *uio, int flag) |
860 | { |
861 | struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, NULL); |
862 | struct tty *tp; |
863 | u_char *cp = NULL; |
864 | int cc = 0; |
865 | u_char locbuf[BUFSIZ]; |
866 | int wcnt = 0; |
867 | int error = 0; |
868 | |
869 | if (pti == NULL) |
870 | return (ENXIO); |
871 | tp = pti->pt_tty; |
872 | tty_lock(tp); |
873 | |
874 | again: |
875 | if ((tp->t_state & TS_ISOPEN) == 0) |
876 | goto block; |
877 | if (pti->pt_flags & PF_REMOTE) { |
878 | if (tp->t_canq.c_cc) |
879 | goto block; |
880 | while ((uio_resid(uio) > 0 || cc > 0) && |
881 | tp->t_canq.c_cc < TTYHOG - 1) { |
882 | if (cc == 0) { |
883 | cc = MIN((int)uio_resid(uio), BUFSIZ); |
884 | cc = MIN(cc, TTYHOG - 1 - tp->t_canq.c_cc); |
885 | cp = locbuf; |
886 | error = uiomove((caddr_t)cp, cc, uio); |
887 | if (error) |
888 | goto out; |
889 | /* check again for safety */ |
890 | if ((tp->t_state & TS_ISOPEN) == 0) { |
891 | /* adjust as usual */ |
892 | uio_setresid(uio, (uio_resid(uio) + cc)); |
893 | error = EIO; |
894 | goto out; |
895 | } |
896 | } |
897 | if (cc > 0) { |
898 | cc = b_to_q((u_char *)cp, cc, &tp->t_canq); |
899 | /* |
900 | * XXX we don't guarantee that the canq size |
901 | * is >= TTYHOG, so the above b_to_q() may |
902 | * leave some bytes uncopied. However, space |
903 | * is guaranteed for the null terminator if |
904 | * we don't fail here since (TTYHOG - 1) is |
905 | * not a multiple of CBSIZE. |
906 | */ |
907 | if (cc > 0) |
908 | break; |
909 | } |
910 | } |
911 | /* adjust for data copied in but not written */ |
912 | uio_setresid(uio, (uio_resid(uio) + cc)); |
913 | (void) putc(0, &tp->t_canq); |
914 | ttwakeup(tp); |
915 | wakeup(TSA_PTS_READ(tp)); |
916 | goto out; |
917 | } |
918 | while (uio_resid(uio) > 0 || cc > 0) { |
919 | if (cc == 0) { |
920 | cc = MIN((int)uio_resid(uio), BUFSIZ); |
921 | cp = locbuf; |
922 | error = uiomove((caddr_t)cp, cc, uio); |
923 | if (error) |
924 | goto out; |
925 | /* check again for safety */ |
926 | if ((tp->t_state & TS_ISOPEN) == 0) { |
927 | /* adjust for data copied in but not written */ |
928 | uio_setresid(uio, (uio_resid(uio) + cc)); |
929 | error = EIO; |
930 | goto out; |
931 | } |
932 | } |
933 | while (cc > 0) { |
934 | if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && |
935 | (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) { |
936 | wakeup(TSA_HUP_OR_INPUT(tp)); |
937 | goto block; |
938 | } |
939 | (*linesw[tp->t_line].l_rint)(*cp++, tp); |
940 | wcnt++; |
941 | cc--; |
942 | } |
943 | cc = 0; |
944 | } |
945 | out: |
946 | tty_unlock(tp); |
947 | |
948 | return (error); |
949 | |
950 | block: |
951 | /* |
952 | * Come here to wait for slave to open, for space |
953 | * in outq, or space in rawq, or an empty canq. |
954 | */ |
955 | if ((tp->t_state & TS_CONNECTED) == 0) { |
956 | /* adjust for data copied in but not written */ |
957 | uio_setresid(uio, (uio_resid(uio) + cc)); |
958 | error = EIO; |
959 | goto out; |
960 | } |
961 | if (flag & IO_NDELAY) { |
962 | /* adjust for data copied in but not written */ |
963 | uio_setresid(uio, (uio_resid(uio) + cc)); |
964 | if (wcnt == 0) |
965 | error = EWOULDBLOCK; |
966 | goto out; |
967 | } |
968 | error = ttysleep(tp, TSA_PTC_WRITE(tp), TTOPRI | PCATCH, __FUNCTION__, 0); |
969 | if (error) { |
970 | /* adjust for data copied in but not written */ |
971 | uio_setresid(uio, (uio_resid(uio) + cc)); |
972 | goto out; |
973 | } |
974 | goto again; |
975 | } |
976 | |
977 | __private_extern__ int |
978 | ptyioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p) |
979 | { |
980 | struct tty_dev_t *driver; |
981 | struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, &driver); |
982 | struct tty *tp; |
983 | int stop, error = 0; |
984 | int allow_ext_ioctl = 1; |
985 | |
986 | if (pti == NULL) |
987 | return (ENXIO); |
988 | tp = pti->pt_tty; |
989 | tty_lock(tp); |
990 | |
991 | u_char *cc = tp->t_cc; |
992 | |
993 | /* |
994 | * Do not permit extended ioctls on the master side of the pty unless |
995 | * the slave side has been successfully opened and initialized. |
996 | */ |
997 | if (major(dev) == driver->master && |
998 | driver->fix_7070978 && |
999 | ISSET(tp->t_state, TS_IOCTL_NOT_OK)) { |
1000 | allow_ext_ioctl = 0; |
1001 | } |
1002 | |
1003 | /* |
1004 | * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. |
1005 | * ttywflush(tp) will hang if there are characters in the outq. |
1006 | */ |
1007 | if (cmd == TIOCEXT && allow_ext_ioctl) { |
1008 | /* |
1009 | * When the EXTPROC bit is being toggled, we need |
1010 | * to send an TIOCPKT_IOCTL if the packet driver |
1011 | * is turned on. |
1012 | */ |
1013 | if (*(int *)data) { |
1014 | if (pti->pt_flags & PF_PKT) { |
1015 | pti->pt_send |= TIOCPKT_IOCTL; |
1016 | ptcwakeup(tp, FREAD); |
1017 | } |
1018 | tp->t_lflag |= EXTPROC; |
1019 | } else { |
1020 | if ((tp->t_lflag & EXTPROC) && |
1021 | (pti->pt_flags & PF_PKT)) { |
1022 | pti->pt_send |= TIOCPKT_IOCTL; |
1023 | ptcwakeup(tp, FREAD); |
1024 | } |
1025 | tp->t_lflag &= ~EXTPROC; |
1026 | } |
1027 | goto out; |
1028 | } else |
1029 | if (cdevsw[major(dev)].d_open == ptcopen) { |
1030 | switch (cmd) { |
1031 | |
1032 | case TIOCGPGRP: |
1033 | /* |
1034 | * We aviod calling ttioctl on the controller since, |
1035 | * in that case, tp must be the controlling terminal. |
1036 | */ |
1037 | *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; |
1038 | goto out; |
1039 | |
1040 | case TIOCPKT: |
1041 | if (*(int *)data) { |
1042 | if (pti->pt_flags & PF_UCNTL) { |
1043 | error = EINVAL; |
1044 | goto out; |
1045 | } |
1046 | pti->pt_flags |= PF_PKT; |
1047 | } else |
1048 | pti->pt_flags &= ~PF_PKT; |
1049 | goto out; |
1050 | |
1051 | case TIOCUCNTL: |
1052 | if (*(int *)data) { |
1053 | if (pti->pt_flags & PF_PKT) { |
1054 | error = EINVAL; |
1055 | goto out; |
1056 | } |
1057 | pti->pt_flags |= PF_UCNTL; |
1058 | } else |
1059 | pti->pt_flags &= ~PF_UCNTL; |
1060 | goto out; |
1061 | |
1062 | case TIOCREMOTE: |
1063 | if (*(int *)data) |
1064 | pti->pt_flags |= PF_REMOTE; |
1065 | else |
1066 | pti->pt_flags &= ~PF_REMOTE; |
1067 | ttyflush(tp, FREAD|FWRITE); |
1068 | goto out; |
1069 | |
1070 | case TIOCSETP: |
1071 | case TIOCSETN: |
1072 | case TIOCSETD: |
1073 | case TIOCSETA_32: |
1074 | case TIOCSETAW_32: |
1075 | case TIOCSETAF_32: |
1076 | case TIOCSETA_64: |
1077 | case TIOCSETAW_64: |
1078 | case TIOCSETAF_64: |
1079 | ndflush(&tp->t_outq, tp->t_outq.c_cc); |
1080 | break; |
1081 | |
1082 | case TIOCSIG: |
1083 | if (*(unsigned int *)data >= NSIG || |
1084 | *(unsigned int *)data == 0) { |
1085 | error = EINVAL; |
1086 | goto out; |
1087 | } |
1088 | if ((tp->t_lflag&NOFLSH) == 0) |
1089 | ttyflush(tp, FREAD|FWRITE); |
1090 | if ((*(unsigned int *)data == SIGINFO) && |
1091 | ((tp->t_lflag&NOKERNINFO) == 0)) |
1092 | ttyinfo_locked(tp); |
1093 | /* |
1094 | * SAFE: All callers drop the lock on return and |
1095 | * SAFE: the linesw[] will short circut this call |
1096 | * SAFE: if the ioctl() is eaten before the lower |
1097 | * SAFE: level code gets to see it. |
1098 | */ |
1099 | tty_unlock(tp); |
1100 | tty_pgsignal(tp, *(unsigned int *)data, 1); |
1101 | tty_lock(tp); |
1102 | goto out; |
1103 | |
1104 | case TIOCPTYGRANT: /* grantpt(3) */ |
1105 | /* |
1106 | * Change the uid of the slave to that of the calling |
1107 | * thread, change the gid of the slave to GID_TTY, |
1108 | * change the mode to 0620 (rw--w----). |
1109 | */ |
1110 | { |
1111 | error = _devfs_setattr(pti->pt_devhandle, 0620, kauth_getuid(), GID_TTY); |
1112 | if (major(dev) == driver->master) { |
1113 | if (driver->mac_notify) { |
1114 | #if CONFIG_MACF |
1115 | if (!error) { |
1116 | tty_unlock(tp); |
1117 | mac_pty_notify_grant(p, tp, dev, NULL); |
1118 | tty_lock(tp); |
1119 | } |
1120 | #endif |
1121 | } else { |
1122 | error = 0; |
1123 | } |
1124 | } |
1125 | goto out; |
1126 | } |
1127 | |
1128 | case TIOCPTYGNAME: /* ptsname(3) */ |
1129 | /* |
1130 | * Report the name of the slave device in *data |
1131 | * (128 bytes max.). Use the same template string |
1132 | * used for calling devfs_make_node() to create it. |
1133 | */ |
1134 | pty_get_name(dev, data, 128); |
1135 | error = 0; |
1136 | goto out; |
1137 | |
1138 | case TIOCPTYUNLK: /* unlockpt(3) */ |
1139 | /* |
1140 | * Unlock the slave device so that it can be opened. |
1141 | */ |
1142 | if (major(dev) == driver->master) { |
1143 | pti->pt_flags |= PF_UNLOCKED; |
1144 | } |
1145 | error = 0; |
1146 | goto out; |
1147 | } |
1148 | |
1149 | /* |
1150 | * Fail all other calls; pty masters are not serial devices; |
1151 | * we only pretend they are when the slave side of the pty is |
1152 | * already open. |
1153 | */ |
1154 | if (!allow_ext_ioctl) { |
1155 | error = ENOTTY; |
1156 | goto out; |
1157 | } |
1158 | } |
1159 | error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); |
1160 | if (error == ENOTTY) { |
1161 | error = ttioctl_locked(tp, cmd, data, flag, p); |
1162 | if (error == ENOTTY) { |
1163 | if (pti->pt_flags & PF_UCNTL && (cmd & ~0xff) == UIOCCMD(0)) { |
1164 | /* Process the UIOCMD ioctl group */ |
1165 | if (cmd & 0xff) { |
1166 | pti->pt_ucntl = (u_char)cmd; |
1167 | ptcwakeup(tp, FREAD); |
1168 | } |
1169 | error = 0; |
1170 | goto out; |
1171 | } else if (cmd == TIOCSBRK || cmd == TIOCCBRK) { |
1172 | /* |
1173 | * POSIX conformance; rdar://3936338 |
1174 | * |
1175 | * Clear ENOTTY in the case of setting or |
1176 | * clearing a break failing because pty's |
1177 | * don't support break like real serial |
1178 | * ports. |
1179 | */ |
1180 | error = 0; |
1181 | goto out; |
1182 | } |
1183 | } |
1184 | } |
1185 | |
1186 | /* |
1187 | * If external processing and packet mode send ioctl packet. |
1188 | */ |
1189 | if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { |
1190 | switch(cmd) { |
1191 | case TIOCSETA_32: |
1192 | case TIOCSETAW_32: |
1193 | case TIOCSETAF_32: |
1194 | case TIOCSETA_64: |
1195 | case TIOCSETAW_64: |
1196 | case TIOCSETAF_64: |
1197 | case TIOCSETP: |
1198 | case TIOCSETN: |
1199 | case TIOCSETC: |
1200 | case TIOCSLTC: |
1201 | case TIOCLBIS: |
1202 | case TIOCLBIC: |
1203 | case TIOCLSET: |
1204 | pti->pt_send |= TIOCPKT_IOCTL; |
1205 | ptcwakeup(tp, FREAD); |
1206 | default: |
1207 | break; |
1208 | } |
1209 | } |
1210 | stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) |
1211 | && CCEQ(cc[VSTART], CTRL('q')); |
1212 | if (pti->pt_flags & PF_NOSTOP) { |
1213 | if (stop) { |
1214 | pti->pt_send &= ~TIOCPKT_NOSTOP; |
1215 | pti->pt_send |= TIOCPKT_DOSTOP; |
1216 | pti->pt_flags &= ~PF_NOSTOP; |
1217 | ptcwakeup(tp, FREAD); |
1218 | } |
1219 | } else { |
1220 | if (!stop) { |
1221 | pti->pt_send &= ~TIOCPKT_DOSTOP; |
1222 | pti->pt_send |= TIOCPKT_NOSTOP; |
1223 | pti->pt_flags |= PF_NOSTOP; |
1224 | ptcwakeup(tp, FREAD); |
1225 | } |
1226 | } |
1227 | out: |
1228 | tty_unlock(tp); |
1229 | |
1230 | return (error); |
1231 | } |
1232 | |