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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 | err = (*linesw[tp->t_line].l_close)(tp, flag); | |
332 | ptsstop(tp, FREAD|FWRITE); | |
333 | (void) ttyclose(tp); | |
334 | #ifdef FIX_VSX_HANG | |
335 | tp->t_timeout = save_timeout; | |
336 | #endif | |
337 | tty_unlock(tp); | |
338 | ||
339 | if ((flag & IO_REVOKE) == IO_REVOKE && driver->revoke) { | |
340 | driver->revoke(minor(dev), tp); | |
341 | } | |
342 | /* unconditional, just like ttyclose() */ | |
343 | pty_free_ioctl(dev, PF_OPEN_S); | |
344 | ||
345 | return (err); | |
346 | } | |
347 | ||
348 | __private_extern__ int | |
349 | ptsread(dev_t dev, struct uio *uio, int flag) | |
350 | { | |
351 | proc_t p = current_proc(); | |
352 | struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, NULL); | |
353 | struct tty *tp; | |
354 | int error = 0; | |
355 | struct uthread *ut; | |
356 | struct pgrp *pg; | |
357 | ||
358 | if (pti == NULL) | |
359 | return (ENXIO); | |
360 | tp = pti->pt_tty; | |
361 | tty_lock(tp); | |
362 | ||
363 | ut = (struct uthread *)get_bsdthread_info(current_thread()); | |
364 | again: | |
365 | if (pti->pt_flags & PF_REMOTE) { | |
366 | while (isbackground(p, tp)) { | |
367 | if ((p->p_sigignore & sigmask(SIGTTIN)) || | |
368 | (ut->uu_sigmask & sigmask(SIGTTIN)) || | |
369 | p->p_lflag & P_LPPWAIT) { | |
370 | error = EIO; | |
371 | goto out; | |
372 | } | |
373 | ||
374 | ||
375 | pg = proc_pgrp(p); | |
376 | if (pg == PGRP_NULL) { | |
377 | error = EIO; | |
378 | goto out; | |
379 | } | |
380 | /* | |
381 | * SAFE: We about to drop the lock ourselves by | |
382 | * SAFE: erroring out or sleeping anyway. | |
383 | */ | |
384 | tty_unlock(tp); | |
385 | if (pg->pg_jobc == 0) { | |
386 | pg_rele(pg); | |
387 | tty_lock(tp); | |
388 | error = EIO; | |
389 | goto out; | |
390 | } | |
391 | pgsignal(pg, SIGTTIN, 1); | |
392 | pg_rele(pg); | |
393 | tty_lock(tp); | |
394 | ||
395 | error = ttysleep(tp, &ptsread, TTIPRI | PCATCH | PTTYBLOCK, __FUNCTION__, hz); | |
396 | if (error) | |
397 | goto out; | |
398 | } | |
399 | if (tp->t_canq.c_cc == 0) { | |
400 | if (flag & IO_NDELAY) { | |
401 | error = EWOULDBLOCK; | |
402 | goto out; | |
403 | } | |
404 | error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, __FUNCTION__, 0); | |
405 | if (error) | |
406 | goto out; | |
407 | goto again; | |
408 | } | |
409 | while (tp->t_canq.c_cc > 1 && uio_resid(uio) > 0) { | |
410 | int cc; | |
411 | char buf[BUFSIZ]; | |
412 | ||
413 | cc = MIN((int)uio_resid(uio), BUFSIZ); | |
414 | // Don't copy the very last byte | |
415 | cc = MIN(cc, tp->t_canq.c_cc - 1); | |
416 | cc = q_to_b(&tp->t_canq, (u_char *)buf, cc); | |
417 | error = uiomove(buf, cc, uio); | |
418 | if (error) | |
419 | break; | |
420 | } | |
421 | if (tp->t_canq.c_cc == 1) | |
422 | (void) getc(&tp->t_canq); | |
423 | if (tp->t_canq.c_cc) | |
424 | goto out; | |
425 | } else | |
426 | if (tp->t_oproc) | |
427 | error = (*linesw[tp->t_line].l_read)(tp, uio, flag); | |
428 | ptcwakeup(tp, FWRITE); | |
429 | out: | |
430 | tty_unlock(tp); | |
431 | return (error); | |
432 | } | |
433 | ||
434 | /* | |
435 | * Write to pseudo-tty. | |
436 | * Wakeups of controlling tty will happen | |
437 | * indirectly, when tty driver calls ptsstart. | |
438 | */ | |
439 | __private_extern__ int | |
440 | ptswrite(dev_t dev, struct uio *uio, int flag) | |
441 | { | |
442 | struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, NULL); | |
443 | struct tty *tp; | |
444 | int error; | |
445 | ||
446 | if (pti == NULL) | |
447 | return (ENXIO); | |
448 | tp = pti->pt_tty; | |
449 | tty_lock(tp); | |
450 | ||
451 | if (tp->t_oproc == 0) | |
452 | error = EIO; | |
453 | else | |
454 | error = (*linesw[tp->t_line].l_write)(tp, uio, flag); | |
455 | ||
456 | tty_unlock(tp); | |
457 | ||
458 | return (error); | |
459 | } | |
460 | ||
461 | /* | |
462 | * Start output on pseudo-tty. | |
463 | * Wake up process selecting or sleeping for input from controlling tty. | |
464 | * | |
465 | * t_oproc for this driver; called from within the line discipline | |
466 | * | |
467 | * Locks: Assumes tp is locked on entry, remains locked on exit | |
468 | */ | |
469 | static void | |
470 | ptsstart(struct tty *tp) | |
471 | { | |
472 | struct ptmx_ioctl *pti = pty_get_ioctl(tp->t_dev, 0, NULL); | |
473 | if (pti == NULL) | |
474 | goto out; | |
475 | if (tp->t_state & TS_TTSTOP) | |
476 | goto out; | |
477 | if (pti->pt_flags & PF_STOPPED) { | |
478 | pti->pt_flags &= ~PF_STOPPED; | |
479 | pti->pt_send = TIOCPKT_START; | |
480 | } | |
481 | ptcwakeup(tp, FREAD); | |
482 | out: | |
483 | return; | |
484 | } | |
485 | ||
486 | /* | |
487 | * Locks: Assumes tty_lock() is held over this call. | |
488 | */ | |
489 | static void | |
490 | ptcwakeup(struct tty *tp, int flag) | |
491 | { | |
492 | struct ptmx_ioctl *pti = pty_get_ioctl(tp->t_dev, 0, NULL); | |
493 | if (pti == NULL) | |
494 | return; | |
495 | ||
496 | if (flag & FREAD) { | |
497 | selwakeup(&pti->pt_selr); | |
498 | wakeup(TSA_PTC_READ(tp)); | |
499 | KNOTE(&pti->pt_selr.si_note, 1); | |
500 | } | |
501 | if (flag & FWRITE) { | |
502 | selwakeup(&pti->pt_selw); | |
503 | wakeup(TSA_PTC_WRITE(tp)); | |
504 | KNOTE(&pti->pt_selw.si_note, 1); | |
505 | } | |
506 | } | |
507 | ||
508 | __private_extern__ int | |
509 | ptcopen(dev_t dev, __unused int flag, __unused int devtype, __unused proc_t p) | |
510 | { | |
511 | struct tty_dev_t *driver; | |
512 | struct ptmx_ioctl *pti = pty_get_ioctl(dev, PF_OPEN_M, &driver); | |
513 | if (pti == NULL) { | |
514 | return (ENXIO); | |
515 | } else if (pti == (struct ptmx_ioctl*)-1) { | |
516 | return (EREDRIVEOPEN); | |
517 | } | |
518 | ||
519 | struct tty *tp = pti->pt_tty; | |
520 | tty_lock(tp); | |
521 | ||
522 | /* If master is open OR slave is still draining, pty is still busy */ | |
523 | if (tp->t_oproc || (tp->t_state & TS_ISOPEN)) { | |
524 | tty_unlock(tp); | |
525 | /* | |
526 | * If master is closed, we are the only reference, so we | |
527 | * need to clear the master open bit | |
528 | */ | |
529 | if (!tp->t_oproc) { | |
530 | pty_free_ioctl(dev, PF_OPEN_M); | |
531 | } | |
532 | return EBUSY; | |
533 | } | |
534 | tp->t_oproc = ptsstart; | |
535 | CLR(tp->t_state, TS_ZOMBIE); | |
536 | SET(tp->t_state, TS_IOCTL_NOT_OK); | |
537 | #ifdef sun4c | |
538 | tp->t_stop = ptsstop; | |
539 | #endif | |
540 | (void)(*linesw[tp->t_line].l_modem)(tp, 1); | |
541 | tp->t_lflag &= ~EXTPROC; | |
542 | ||
543 | if (driver->open_reset) { | |
544 | pti->pt_flags = PF_UNLOCKED; | |
545 | pti->pt_send = 0; | |
546 | pti->pt_ucntl = 0; | |
547 | } | |
548 | ||
549 | tty_unlock(tp); | |
550 | return 0; | |
551 | } | |
552 | ||
553 | __private_extern__ int | |
554 | ptcclose(dev_t dev, __unused int flags, __unused int fmt, __unused proc_t p) | |
555 | { | |
556 | struct tty_dev_t *driver; | |
557 | struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, &driver); | |
558 | struct tty *tp; | |
559 | ||
560 | if (pti == NULL) | |
561 | return (ENXIO); | |
562 | tp = pti->pt_tty; | |
563 | tty_lock(tp); | |
564 | ||
565 | (void)(*linesw[tp->t_line].l_modem)(tp, 0); | |
566 | ||
567 | /* | |
568 | * XXX MDMBUF makes no sense for ptys but would inhibit the above | |
569 | * l_modem(). CLOCAL makes sense but isn't supported. Special | |
570 | * l_modem()s that ignore carrier drop make no sense for ptys but | |
571 | * may be in use because other parts of the line discipline make | |
572 | * sense for ptys. Recover by doing everything that a normal | |
573 | * ttymodem() would have done except for sending a SIGHUP. | |
574 | */ | |
575 | if (tp->t_state & TS_ISOPEN) { | |
576 | tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); | |
577 | tp->t_state |= TS_ZOMBIE; | |
578 | ttyflush(tp, FREAD | FWRITE); | |
579 | } | |
580 | ||
581 | tp->t_oproc = 0; /* mark closed */ | |
582 | ||
583 | tty_unlock(tp); | |
584 | ||
585 | pty_free_ioctl(dev, PF_OPEN_M); | |
586 | #if CONFIG_MACF | |
587 | if (driver->mac_notify) { | |
588 | mac_pty_notify_close(p, tp, dev, NULL); | |
589 | } | |
590 | #endif | |
591 | ||
592 | return (0); | |
593 | } | |
594 | ||
595 | __private_extern__ int | |
596 | ptcread(dev_t dev, struct uio *uio, int flag) | |
597 | { | |
598 | struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, NULL); | |
599 | struct tty *tp; | |
600 | char buf[BUFSIZ]; | |
601 | int error = 0, cc; | |
602 | ||
603 | if (pti == NULL) | |
604 | return (ENXIO); | |
605 | tp = pti->pt_tty; | |
606 | tty_lock(tp); | |
607 | ||
608 | /* | |
609 | * We want to block until the slave | |
610 | * is open, and there's something to read; | |
611 | * but if we lost the slave or we're NBIO, | |
612 | * then return the appropriate error instead. | |
613 | */ | |
614 | for (;;) { | |
615 | if (tp->t_state & TS_ISOPEN) { | |
616 | if (pti->pt_flags & PF_PKT && pti->pt_send) { | |
617 | error = ureadc((int)pti->pt_send, uio); | |
618 | if (error) | |
619 | goto out; | |
620 | if (pti->pt_send & TIOCPKT_IOCTL) { | |
621 | cc = MIN((int)uio_resid(uio), | |
622 | (int)sizeof(tp->t_termios)); | |
623 | uiomove((caddr_t)&tp->t_termios, cc, | |
624 | uio); | |
625 | } | |
626 | pti->pt_send = 0; | |
627 | goto out; | |
628 | } | |
629 | if (pti->pt_flags & PF_UCNTL && pti->pt_ucntl) { | |
630 | error = ureadc((int)pti->pt_ucntl, uio); | |
631 | if (error) | |
632 | goto out; | |
633 | pti->pt_ucntl = 0; | |
634 | goto out; | |
635 | } | |
636 | if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) | |
637 | break; | |
638 | } | |
639 | if ((tp->t_state & TS_CONNECTED) == 0) | |
640 | goto out; /* EOF */ | |
641 | if (flag & IO_NDELAY) { | |
642 | error = EWOULDBLOCK; | |
643 | goto out; | |
644 | } | |
645 | error = ttysleep(tp, TSA_PTC_READ(tp), TTIPRI | PCATCH, __FUNCTION__, 0); | |
646 | if (error) | |
647 | goto out; | |
648 | } | |
649 | if (pti->pt_flags & (PF_PKT|PF_UCNTL)) | |
650 | error = ureadc(0, uio); | |
651 | while (uio_resid(uio) > 0 && error == 0) { | |
652 | cc = q_to_b(&tp->t_outq, (u_char *)buf, MIN((int)uio_resid(uio), BUFSIZ)); | |
653 | if (cc <= 0) | |
654 | break; | |
655 | error = uiomove(buf, cc, uio); | |
656 | } | |
657 | (*linesw[tp->t_line].l_start)(tp); | |
658 | ||
659 | out: | |
660 | tty_unlock(tp); | |
661 | ||
662 | return (error); | |
663 | } | |
664 | ||
665 | /* | |
666 | * Line discipline callback | |
667 | * | |
668 | * Locks: tty_lock() is assumed held on entry and exit. | |
669 | */ | |
670 | __private_extern__ int | |
671 | ptsstop(struct tty* tp, int flush) | |
672 | { | |
673 | struct ptmx_ioctl *pti = pty_get_ioctl(tp->t_dev, 0, NULL); | |
674 | int flag; | |
675 | ||
676 | if (pti == NULL) | |
677 | return (ENXIO); | |
678 | ||
679 | /* note: FLUSHREAD and FLUSHWRITE already ok */ | |
680 | if (flush == 0) { | |
681 | flush = TIOCPKT_STOP; | |
682 | pti->pt_flags |= PF_STOPPED; | |
683 | } else | |
684 | pti->pt_flags &= ~PF_STOPPED; | |
685 | pti->pt_send |= flush; | |
686 | /* change of perspective */ | |
687 | flag = 0; | |
688 | if (flush & FREAD) | |
689 | flag |= FWRITE; | |
690 | if (flush & FWRITE) | |
691 | flag |= FREAD; | |
692 | ptcwakeup(tp, flag); | |
693 | return 0; | |
694 | } | |
695 | ||
696 | __private_extern__ int | |
697 | ptsreset(__unused int uban) | |
698 | { | |
699 | return (0); | |
700 | } | |
701 | ||
702 | int | |
703 | ptsselect(dev_t dev, int rw, void *wql, proc_t p) | |
704 | { | |
705 | struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, NULL); | |
706 | struct tty *tp; | |
707 | int retval = 0; | |
708 | ||
709 | if (pti == NULL) | |
710 | return (ENXIO); | |
711 | tp = pti->pt_tty; | |
712 | if (tp == NULL) | |
713 | return (ENXIO); | |
714 | ||
715 | tty_lock(tp); | |
716 | ||
717 | switch (rw) { | |
718 | case FREAD: | |
719 | if (ISSET(tp->t_state, TS_ZOMBIE)) { | |
720 | retval = 1; | |
721 | break; | |
722 | } | |
723 | ||
724 | retval = ttnread(tp); | |
725 | if (retval > 0) { | |
726 | break; | |
727 | } | |
728 | ||
729 | selrecord(p, &tp->t_rsel, wql); | |
730 | break; | |
731 | case FWRITE: | |
732 | if (ISSET(tp->t_state, TS_ZOMBIE)) { | |
733 | retval = 1; | |
734 | break; | |
735 | } | |
736 | ||
737 | if ((tp->t_outq.c_cc <= tp->t_lowat) && | |
738 | ISSET(tp->t_state, TS_CONNECTED)) { | |
739 | retval = tp->t_hiwat - tp->t_outq.c_cc; | |
740 | break; | |
741 | } | |
742 | ||
743 | selrecord(p, &tp->t_wsel, wql); | |
744 | break; | |
745 | } | |
746 | ||
747 | tty_unlock(tp); | |
748 | return (retval); | |
749 | } | |
750 | ||
751 | __private_extern__ int | |
752 | ptcselect(dev_t dev, int rw, void *wql, proc_t p) | |
753 | { | |
754 | struct tty_dev_t *driver; | |
755 | struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, &driver); | |
756 | struct tty *tp; | |
757 | int retval = 0; | |
758 | ||
759 | if (pti == NULL) | |
760 | return (ENXIO); | |
761 | tp = pti->pt_tty; | |
762 | tty_lock(tp); | |
763 | ||
764 | if ((tp->t_state & TS_CONNECTED) == 0) { | |
765 | retval = 1; | |
766 | goto out; | |
767 | } | |
768 | switch (rw) { | |
769 | ||
770 | case FREAD: | |
771 | /* | |
772 | * Need to block timeouts (ttrstart). | |
773 | */ | |
774 | if ((tp->t_state&TS_ISOPEN) && | |
775 | tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) { | |
776 | retval = (driver->fix_7828447) ? tp->t_outq.c_cc : 1; | |
777 | break; | |
778 | } | |
779 | /* FALLTHROUGH */ | |
780 | ||
781 | case 0: /* exceptional */ | |
782 | if ((tp->t_state&TS_ISOPEN) && | |
783 | (((pti->pt_flags & PF_PKT) && pti->pt_send) || | |
784 | ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) { | |
785 | retval = 1; | |
786 | break; | |
787 | } | |
788 | selrecord(p, &pti->pt_selr, wql); | |
789 | break; | |
790 | ||
791 | ||
792 | case FWRITE: | |
793 | if (tp->t_state&TS_ISOPEN) { | |
794 | if (pti->pt_flags & PF_REMOTE) { | |
795 | if (tp->t_canq.c_cc == 0) { | |
796 | retval = (driver->fix_7828447) ? (TTYHOG - 1) : 1; | |
797 | break; | |
798 | } | |
799 | } else { | |
800 | retval = (TTYHOG - 2) - (tp->t_rawq.c_cc + tp->t_canq.c_cc); | |
801 | if (retval > 0) { | |
802 | retval = (driver->fix_7828447) ? retval : 1; | |
803 | break; | |
804 | } | |
805 | if (tp->t_canq.c_cc == 0 && (tp->t_lflag&ICANON)) { | |
806 | retval = 1; | |
807 | break; | |
808 | } | |
809 | retval = 0; | |
810 | } | |
811 | } | |
812 | selrecord(p, &pti->pt_selw, wql); | |
813 | break; | |
814 | ||
815 | } | |
816 | out: | |
817 | tty_unlock(tp); | |
818 | ||
819 | return (retval); | |
820 | } | |
821 | ||
822 | __private_extern__ int | |
823 | ptcstop(__unused struct tty *tp, __unused int flush) | |
824 | { | |
825 | return (0); | |
826 | } | |
827 | ||
828 | __private_extern__ int | |
829 | ptcreset(__unused int uban) | |
830 | { | |
831 | return (0); | |
832 | } | |
833 | ||
834 | __private_extern__ int | |
835 | ptcwrite(dev_t dev, struct uio *uio, int flag) | |
836 | { | |
837 | struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, NULL); | |
838 | struct tty *tp; | |
839 | u_char *cp = NULL; | |
840 | int cc = 0; | |
841 | u_char locbuf[BUFSIZ]; | |
842 | int wcnt = 0; | |
843 | int error = 0; | |
844 | ||
845 | if (pti == NULL) | |
846 | return (ENXIO); | |
847 | tp = pti->pt_tty; | |
848 | tty_lock(tp); | |
849 | ||
850 | again: | |
851 | if ((tp->t_state & TS_ISOPEN) == 0) | |
852 | goto block; | |
853 | if (pti->pt_flags & PF_REMOTE) { | |
854 | if (tp->t_canq.c_cc) | |
855 | goto block; | |
856 | while ((uio_resid(uio) > 0 || cc > 0) && | |
857 | tp->t_canq.c_cc < TTYHOG - 1) { | |
858 | if (cc == 0) { | |
859 | cc = MIN((int)uio_resid(uio), BUFSIZ); | |
860 | cc = MIN(cc, TTYHOG - 1 - tp->t_canq.c_cc); | |
861 | cp = locbuf; | |
862 | error = uiomove((caddr_t)cp, cc, uio); | |
863 | if (error) | |
864 | goto out; | |
865 | /* check again for safety */ | |
866 | if ((tp->t_state & TS_ISOPEN) == 0) { | |
867 | /* adjust as usual */ | |
868 | uio_setresid(uio, (uio_resid(uio) + cc)); | |
869 | error = EIO; | |
870 | goto out; | |
871 | } | |
872 | } | |
873 | if (cc > 0) { | |
874 | cc = b_to_q((u_char *)cp, cc, &tp->t_canq); | |
875 | /* | |
876 | * XXX we don't guarantee that the canq size | |
877 | * is >= TTYHOG, so the above b_to_q() may | |
878 | * leave some bytes uncopied. However, space | |
879 | * is guaranteed for the null terminator if | |
880 | * we don't fail here since (TTYHOG - 1) is | |
881 | * not a multiple of CBSIZE. | |
882 | */ | |
883 | if (cc > 0) | |
884 | break; | |
885 | } | |
886 | } | |
887 | /* adjust for data copied in but not written */ | |
888 | uio_setresid(uio, (uio_resid(uio) + cc)); | |
889 | (void) putc(0, &tp->t_canq); | |
890 | ttwakeup(tp); | |
891 | wakeup(TSA_PTS_READ(tp)); | |
892 | goto out; | |
893 | } | |
894 | while (uio_resid(uio) > 0 || cc > 0) { | |
895 | if (cc == 0) { | |
896 | cc = MIN((int)uio_resid(uio), BUFSIZ); | |
897 | cp = locbuf; | |
898 | error = uiomove((caddr_t)cp, cc, uio); | |
899 | if (error) | |
900 | goto out; | |
901 | /* check again for safety */ | |
902 | if ((tp->t_state & TS_ISOPEN) == 0) { | |
903 | /* adjust for data copied in but not written */ | |
904 | uio_setresid(uio, (uio_resid(uio) + cc)); | |
905 | error = EIO; | |
906 | goto out; | |
907 | } | |
908 | } | |
909 | while (cc > 0) { | |
910 | if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && | |
911 | (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) { | |
912 | wakeup(TSA_HUP_OR_INPUT(tp)); | |
913 | goto block; | |
914 | } | |
915 | (*linesw[tp->t_line].l_rint)(*cp++, tp); | |
916 | wcnt++; | |
917 | cc--; | |
918 | } | |
919 | cc = 0; | |
920 | } | |
921 | out: | |
922 | tty_unlock(tp); | |
923 | ||
924 | return (error); | |
925 | ||
926 | block: | |
927 | /* | |
928 | * Come here to wait for slave to open, for space | |
929 | * in outq, or space in rawq, or an empty canq. | |
930 | */ | |
931 | if ((tp->t_state & TS_CONNECTED) == 0) { | |
932 | /* adjust for data copied in but not written */ | |
933 | uio_setresid(uio, (uio_resid(uio) + cc)); | |
934 | error = EIO; | |
935 | goto out; | |
936 | } | |
937 | if (flag & IO_NDELAY) { | |
938 | /* adjust for data copied in but not written */ | |
939 | uio_setresid(uio, (uio_resid(uio) + cc)); | |
940 | if (wcnt == 0) | |
941 | error = EWOULDBLOCK; | |
942 | goto out; | |
943 | } | |
944 | error = ttysleep(tp, TSA_PTC_WRITE(tp), TTOPRI | PCATCH, __FUNCTION__, 0); | |
945 | if (error) { | |
946 | /* adjust for data copied in but not written */ | |
947 | uio_setresid(uio, (uio_resid(uio) + cc)); | |
948 | goto out; | |
949 | } | |
950 | goto again; | |
951 | } | |
952 | ||
953 | __private_extern__ int | |
954 | ptyioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p) | |
955 | { | |
956 | struct tty_dev_t *driver; | |
957 | struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, &driver); | |
958 | struct tty *tp; | |
959 | int stop, error = 0; | |
960 | int allow_ext_ioctl = 1; | |
961 | ||
962 | if (pti == NULL) | |
963 | return (ENXIO); | |
964 | tp = pti->pt_tty; | |
965 | tty_lock(tp); | |
966 | ||
967 | u_char *cc = tp->t_cc; | |
968 | ||
969 | /* | |
970 | * Do not permit extended ioctls on the master side of the pty unless | |
971 | * the slave side has been successfully opened and initialized. | |
972 | */ | |
973 | if (major(dev) == driver->master && | |
974 | driver->fix_7070978 && | |
975 | ISSET(tp->t_state, TS_IOCTL_NOT_OK)) { | |
976 | allow_ext_ioctl = 0; | |
977 | } | |
978 | ||
979 | /* | |
980 | * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. | |
981 | * ttywflush(tp) will hang if there are characters in the outq. | |
982 | */ | |
983 | if (cmd == TIOCEXT && allow_ext_ioctl) { | |
984 | /* | |
985 | * When the EXTPROC bit is being toggled, we need | |
986 | * to send an TIOCPKT_IOCTL if the packet driver | |
987 | * is turned on. | |
988 | */ | |
989 | if (*(int *)data) { | |
990 | if (pti->pt_flags & PF_PKT) { | |
991 | pti->pt_send |= TIOCPKT_IOCTL; | |
992 | ptcwakeup(tp, FREAD); | |
993 | } | |
994 | tp->t_lflag |= EXTPROC; | |
995 | } else { | |
996 | if ((tp->t_lflag & EXTPROC) && | |
997 | (pti->pt_flags & PF_PKT)) { | |
998 | pti->pt_send |= TIOCPKT_IOCTL; | |
999 | ptcwakeup(tp, FREAD); | |
1000 | } | |
1001 | tp->t_lflag &= ~EXTPROC; | |
1002 | } | |
1003 | goto out; | |
1004 | } else | |
1005 | if (cdevsw[major(dev)].d_open == ptcopen) { | |
1006 | switch (cmd) { | |
1007 | ||
1008 | case TIOCGPGRP: | |
1009 | /* | |
1010 | * We aviod calling ttioctl on the controller since, | |
1011 | * in that case, tp must be the controlling terminal. | |
1012 | */ | |
1013 | *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; | |
1014 | goto out; | |
1015 | ||
1016 | case TIOCPKT: | |
1017 | if (*(int *)data) { | |
1018 | if (pti->pt_flags & PF_UCNTL) { | |
1019 | error = EINVAL; | |
1020 | goto out; | |
1021 | } | |
1022 | pti->pt_flags |= PF_PKT; | |
1023 | } else | |
1024 | pti->pt_flags &= ~PF_PKT; | |
1025 | goto out; | |
1026 | ||
1027 | case TIOCUCNTL: | |
1028 | if (*(int *)data) { | |
1029 | if (pti->pt_flags & PF_PKT) { | |
1030 | error = EINVAL; | |
1031 | goto out; | |
1032 | } | |
1033 | pti->pt_flags |= PF_UCNTL; | |
1034 | } else | |
1035 | pti->pt_flags &= ~PF_UCNTL; | |
1036 | goto out; | |
1037 | ||
1038 | case TIOCREMOTE: | |
1039 | if (*(int *)data) | |
1040 | pti->pt_flags |= PF_REMOTE; | |
1041 | else | |
1042 | pti->pt_flags &= ~PF_REMOTE; | |
1043 | ttyflush(tp, FREAD|FWRITE); | |
1044 | goto out; | |
1045 | ||
1046 | case TIOCSETP: | |
1047 | case TIOCSETN: | |
1048 | case TIOCSETD: | |
1049 | case TIOCSETA_32: | |
1050 | case TIOCSETAW_32: | |
1051 | case TIOCSETAF_32: | |
1052 | case TIOCSETA_64: | |
1053 | case TIOCSETAW_64: | |
1054 | case TIOCSETAF_64: | |
1055 | ndflush(&tp->t_outq, tp->t_outq.c_cc); | |
1056 | break; | |
1057 | ||
1058 | case TIOCSIG: | |
1059 | if (*(unsigned int *)data >= NSIG || | |
1060 | *(unsigned int *)data == 0) { | |
1061 | error = EINVAL; | |
1062 | goto out; | |
1063 | } | |
1064 | if ((tp->t_lflag&NOFLSH) == 0) | |
1065 | ttyflush(tp, FREAD|FWRITE); | |
1066 | if ((*(unsigned int *)data == SIGINFO) && | |
1067 | ((tp->t_lflag&NOKERNINFO) == 0)) | |
1068 | ttyinfo_locked(tp); | |
1069 | /* | |
1070 | * SAFE: All callers drop the lock on return and | |
1071 | * SAFE: the linesw[] will short circut this call | |
1072 | * SAFE: if the ioctl() is eaten before the lower | |
1073 | * SAFE: level code gets to see it. | |
1074 | */ | |
1075 | tty_unlock(tp); | |
1076 | tty_pgsignal(tp, *(unsigned int *)data, 1); | |
1077 | tty_lock(tp); | |
1078 | goto out; | |
1079 | ||
1080 | case TIOCPTYGRANT: /* grantpt(3) */ | |
1081 | /* | |
1082 | * Change the uid of the slave to that of the calling | |
1083 | * thread, change the gid of the slave to GID_TTY, | |
1084 | * change the mode to 0620 (rw--w----). | |
1085 | */ | |
1086 | { | |
1087 | error = _devfs_setattr(pti->pt_devhandle, 0620, kauth_getuid(), GID_TTY); | |
1088 | if (major(dev) == driver->master) { | |
1089 | if (driver->mac_notify) { | |
1090 | #if CONFIG_MACF | |
1091 | if (!error) { | |
1092 | tty_unlock(tp); | |
1093 | mac_pty_notify_grant(p, tp, dev, NULL); | |
1094 | tty_lock(tp); | |
1095 | } | |
1096 | #endif | |
1097 | } else { | |
1098 | error = 0; | |
1099 | } | |
1100 | } | |
1101 | goto out; | |
1102 | } | |
1103 | ||
1104 | case TIOCPTYGNAME: /* ptsname(3) */ | |
1105 | /* | |
1106 | * Report the name of the slave device in *data | |
1107 | * (128 bytes max.). Use the same template string | |
1108 | * used for calling devfs_make_node() to create it. | |
1109 | */ | |
1110 | pty_get_name(dev, data, 128); | |
1111 | error = 0; | |
1112 | goto out; | |
1113 | ||
1114 | case TIOCPTYUNLK: /* unlockpt(3) */ | |
1115 | /* | |
1116 | * Unlock the slave device so that it can be opened. | |
1117 | */ | |
1118 | if (major(dev) == driver->master) { | |
1119 | pti->pt_flags |= PF_UNLOCKED; | |
1120 | } | |
1121 | error = 0; | |
1122 | goto out; | |
1123 | } | |
1124 | ||
1125 | /* | |
1126 | * Fail all other calls; pty masters are not serial devices; | |
1127 | * we only pretend they are when the slave side of the pty is | |
1128 | * already open. | |
1129 | */ | |
1130 | if (!allow_ext_ioctl) { | |
1131 | error = ENOTTY; | |
1132 | goto out; | |
1133 | } | |
1134 | } | |
1135 | error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); | |
1136 | if (error == ENOTTY) { | |
1137 | error = ttioctl_locked(tp, cmd, data, flag, p); | |
1138 | if (error == ENOTTY) { | |
1139 | if (pti->pt_flags & PF_UCNTL && (cmd & ~0xff) == UIOCCMD(0)) { | |
1140 | /* Process the UIOCMD ioctl group */ | |
1141 | if (cmd & 0xff) { | |
1142 | pti->pt_ucntl = (u_char)cmd; | |
1143 | ptcwakeup(tp, FREAD); | |
1144 | } | |
1145 | error = 0; | |
1146 | goto out; | |
1147 | } else if (cmd == TIOCSBRK || cmd == TIOCCBRK) { | |
1148 | /* | |
1149 | * POSIX conformance; rdar://3936338 | |
1150 | * | |
1151 | * Clear ENOTTY in the case of setting or | |
1152 | * clearing a break failing because pty's | |
1153 | * don't support break like real serial | |
1154 | * ports. | |
1155 | */ | |
1156 | error = 0; | |
1157 | goto out; | |
1158 | } | |
1159 | } | |
1160 | } | |
1161 | ||
1162 | /* | |
1163 | * If external processing and packet mode send ioctl packet. | |
1164 | */ | |
1165 | if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { | |
1166 | switch(cmd) { | |
1167 | case TIOCSETA_32: | |
1168 | case TIOCSETAW_32: | |
1169 | case TIOCSETAF_32: | |
1170 | case TIOCSETA_64: | |
1171 | case TIOCSETAW_64: | |
1172 | case TIOCSETAF_64: | |
1173 | case TIOCSETP: | |
1174 | case TIOCSETN: | |
1175 | case TIOCSETC: | |
1176 | case TIOCSLTC: | |
1177 | case TIOCLBIS: | |
1178 | case TIOCLBIC: | |
1179 | case TIOCLSET: | |
1180 | pti->pt_send |= TIOCPKT_IOCTL; | |
1181 | ptcwakeup(tp, FREAD); | |
1182 | default: | |
1183 | break; | |
1184 | } | |
1185 | } | |
1186 | stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) | |
1187 | && CCEQ(cc[VSTART], CTRL('q')); | |
1188 | if (pti->pt_flags & PF_NOSTOP) { | |
1189 | if (stop) { | |
1190 | pti->pt_send &= ~TIOCPKT_NOSTOP; | |
1191 | pti->pt_send |= TIOCPKT_DOSTOP; | |
1192 | pti->pt_flags &= ~PF_NOSTOP; | |
1193 | ptcwakeup(tp, FREAD); | |
1194 | } | |
1195 | } else { | |
1196 | if (!stop) { | |
1197 | pti->pt_send &= ~TIOCPKT_DOSTOP; | |
1198 | pti->pt_send |= TIOCPKT_NOSTOP; | |
1199 | pti->pt_flags |= PF_NOSTOP; | |
1200 | ptcwakeup(tp, FREAD); | |
1201 | } | |
1202 | } | |
1203 | out: | |
1204 | tty_unlock(tp); | |
1205 | ||
1206 | return (error); | |
1207 | } |