kernel - Major signal path adjustments to fix races, tsleep race fixes, +more
[dragonfly.git] / sys / kern / tty_pty.c
CommitLineData
984263bc 1/*
22ff886e
AH
2 * (MPSAFE)
3 *
984263bc
MD
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. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95
36 * $FreeBSD: src/sys/kern/tty_pty.c,v 1.74.2.4 2002/02/20 19:58:13 dillon Exp $
37 */
38
39/*
22ff886e
AH
40 * MPSAFE NOTE:
41 * Most functions here could use a separate lock to deal with concurrent
42 * access to the 'pt's.
43 *
44 * Right now the tty_token must be held for all this.
45 */
46
47/*
984263bc 48 * Pseudo-teletype Driver
fef8985e 49 * (Actually two drivers, requiring two dev_ops structures)
984263bc 50 */
5ff2eacd 51
984263bc 52#include "opt_compat.h"
1f2de5d4 53
984263bc
MD
54#include <sys/param.h>
55#include <sys/systm.h>
56#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
57#include <sys/ioctl_compat.h>
58#endif
59#include <sys/proc.h>
895c1f85 60#include <sys/priv.h>
984263bc
MD
61#include <sys/tty.h>
62#include <sys/conf.h>
63#include <sys/fcntl.h>
984263bc
MD
64#include <sys/kernel.h>
65#include <sys/vnode.h>
66#include <sys/signalvar.h>
67#include <sys/malloc.h>
335dda38 68#include <sys/device.h>
e43a034f 69#include <sys/thread2.h>
2c1e28dd 70#include <sys/devfs.h>
c578a286
AH
71#include <sys/stat.h>
72#include <sys/sysctl.h>
cd29885a 73
c578a286 74#define UNIX98_PTYS 1
984263bc
MD
75
76MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
77
402ed7e1
RG
78static void ptsstart (struct tty *tp);
79static void ptsstop (struct tty *tp, int rw);
f5f1bbd4 80static void ptsunhold (struct tty *tp);
402ed7e1
RG
81static void ptcwakeup (struct tty *tp, int flag);
82static void ptyinit (int n);
8acdf1cf
MD
83static int filt_ptcread (struct knote *kn, long hint);
84static void filt_ptcrdetach (struct knote *kn);
85static int filt_ptcwrite (struct knote *kn, long hint);
86static void filt_ptcwdetach (struct knote *kn);
984263bc
MD
87
88static d_open_t ptsopen;
89static d_close_t ptsclose;
90static d_read_t ptsread;
91static d_write_t ptswrite;
92static d_ioctl_t ptyioctl;
93static d_open_t ptcopen;
94static d_close_t ptcclose;
95static d_read_t ptcread;
96static d_write_t ptcwrite;
8acdf1cf 97static d_kqfilter_t ptckqfilter;
c578a286
AH
98
99#ifdef UNIX98_PTYS
100DEVFS_DECLARE_CLONE_BITMAP(pty);
101
cd29885a 102static d_clone_t ptyclone;
c578a286
AH
103
104static int pty_debug_level = 0;
530c8749
AH
105
106static struct dev_ops pts98_ops = {
b14aaf07 107 { "pts98", 0, D_TTY | D_MPSAFE },
530c8749
AH
108 .d_open = ptsopen,
109 .d_close = ptsclose,
110 .d_read = ptsread,
111 .d_write = ptswrite,
112 .d_ioctl = ptyioctl,
530c8749
AH
113 .d_kqfilter = ttykqfilter,
114 .d_revoke = ttyrevoke
115};
116
117static struct dev_ops ptc98_ops = {
b14aaf07 118 { "ptc98", 0, D_TTY | D_MASTER | D_MPSAFE },
530c8749
AH
119 .d_open = ptcopen,
120 .d_close = ptcclose,
121 .d_read = ptcread,
122 .d_write = ptcwrite,
123 .d_ioctl = ptyioctl,
8acdf1cf 124 .d_kqfilter = ptckqfilter,
530c8749
AH
125 .d_revoke = ttyrevoke
126};
5d40c1cd 127#endif
984263bc 128
fef8985e 129static struct dev_ops pts_ops = {
b14aaf07 130 { "pts", 0, D_TTY | D_MPSAFE },
fef8985e
MD
131 .d_open = ptsopen,
132 .d_close = ptsclose,
133 .d_read = ptsread,
134 .d_write = ptswrite,
135 .d_ioctl = ptyioctl,
a32446b7
MD
136 .d_kqfilter = ttykqfilter,
137 .d_revoke = ttyrevoke
984263bc
MD
138};
139
140#define CDEV_MAJOR_C 6
fef8985e 141static struct dev_ops ptc_ops = {
b14aaf07 142 { "ptc", 0, D_TTY | D_MASTER | D_MPSAFE },
fef8985e
MD
143 .d_open = ptcopen,
144 .d_close = ptcclose,
145 .d_read = ptcread,
146 .d_write = ptcwrite,
147 .d_ioctl = ptyioctl,
8acdf1cf 148 .d_kqfilter = ptckqfilter,
a32446b7 149 .d_revoke = ttyrevoke
984263bc
MD
150};
151
152#define BUFSIZ 100 /* Chunk size iomoved to/from user */
153
154struct pt_ioctl {
155 int pt_flags;
2281ff2e
MD
156 int pt_refs; /* Structural references interlock S/MOPEN */
157 int pt_uminor;
5b22f1a7 158 struct kqinfo pt_kqr, pt_kqw;
984263bc
MD
159 u_char pt_send;
160 u_char pt_ucntl;
161 struct tty pt_tty;
b13267a5 162 cdev_t devs, devc;
984263bc
MD
163 struct prison *pt_prison;
164};
165
f5f1bbd4
MD
166/*
167 * pt_flags ptc state
168 */
169#define PF_PKT 0x0008 /* packet mode */
170#define PF_STOPPED 0x0010 /* user told stopped */
171#define PF_REMOTE 0x0020 /* remote and flow controlled input */
172#define PF_NOSTOP 0x0040
173#define PF_UCNTL 0x0080 /* user control mode */
984263bc 174
f5f1bbd4
MD
175#define PF_PTCSTATEMASK 0x00FF
176
177/*
178 * pt_flags open state. Note that PF_SCLOSED is used to activate
179 * read EOF on the ptc so it is only set after the slave has been
180 * opened and then closed, and cleared again if the slave is opened
181 * again.
182 */
183#define PF_UNIX98 0x0100
184#define PF_SOPEN 0x0200
185#define PF_MOPEN 0x0400
186#define PF_SCLOSED 0x0800
187#define PF_TERMINATED 0x8000
c578a286 188
984263bc
MD
189/*
190 * This function creates and initializes a pts/ptc pair
191 *
192 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
193 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
194 *
195 * XXX: define and add mapping of upper minor bits to allow more
196 * than 256 ptys.
197 */
198static void
c972a82f 199ptyinit(int n)
984263bc 200{
b13267a5 201 cdev_t devs, devc;
984263bc
MD
202 char *names = "pqrsPQRS";
203 struct pt_ioctl *pt;
204
205 /* For now we only map the lower 8 bits of the minor */
206 if (n & ~0xff)
207 return;
208
e7b4468c 209 pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
fef8985e 210 pt->devs = devs = make_dev(&pts_ops, n,
984263bc 211 0, 0, 0666, "tty%c%r", names[n / 32], n % 32);
fef8985e 212 pt->devc = devc = make_dev(&ptc_ops, n,
984263bc
MD
213 0, 0, 0666, "pty%c%r", names[n / 32], n % 32);
214
22ff886e
AH
215 pt->pt_tty.t_dev = devs;
216 pt->pt_uminor = n;
984263bc
MD
217 devs->si_drv1 = devc->si_drv1 = pt;
218 devs->si_tty = devc->si_tty = &pt->pt_tty;
4062d050
MD
219 devs->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
220 devc->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
984263bc
MD
221 ttyregister(&pt->pt_tty);
222}
223
c578a286 224#ifdef UNIX98_PTYS
cd29885a
MD
225static int
226ptyclone(struct dev_clone_args *ap)
227{
228 int unit;
229 struct pt_ioctl *pt;
230
c578a286
AH
231 /*
232 * Limit the number of unix98 pty (slave) devices to 1000, as
233 * the utmp(5) format only allows for 8 bytes for the tty,
234 * "pts/XXX".
235 * If this limit is reached, we don't clone and return error
236 * to devfs.
237 */
238 unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(pty), 1000);
cd29885a 239
c578a286
AH
240 if (unit < 0) {
241 ap->a_dev = NULL;
cd29885a 242 return 1;
c578a286 243 }
cd29885a
MD
244
245 pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
cd29885a 246
2281ff2e
MD
247 pt->devc = make_only_dev(&ptc98_ops, unit,
248 ap->a_cred->cr_ruid,
249 0, 0600, "ptm/%d", unit);
250 pt->devs = make_dev(&pts98_ops, unit,
251 ap->a_cred->cr_ruid,
252 GID_TTY, 0620, "pts/%d", unit);
253 ap->a_dev = pt->devc;
c578a286
AH
254
255 pt->devs->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
256 pt->devc->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
cd29885a 257
cd29885a 258 pt->pt_tty.t_dev = pt->devs;
f5f1bbd4 259 pt->pt_flags |= PF_UNIX98;
2281ff2e 260 pt->pt_uminor = unit;
22ff886e
AH
261 pt->devs->si_drv1 = pt->devc->si_drv1 = pt;
262 pt->devs->si_tty = pt->devc->si_tty = &pt->pt_tty;
c578a286 263
cd29885a
MD
264 ttyregister(&pt->pt_tty);
265
266 return 0;
267}
5d40c1cd 268#endif
cd29885a 269
2281ff2e
MD
270/*
271 * pti_hold() prevents the pti from being destroyed due to a termination
272 * while a pt*open() is blocked.
273 *
274 * This function returns non-zero if we cannot hold due to a termination
275 * interlock.
22ff886e
AH
276 *
277 * NOTE: Must be called with tty_token held
2281ff2e
MD
278 */
279static int
280pti_hold(struct pt_ioctl *pti)
281{
f5f1bbd4 282 if (pti->pt_flags & PF_TERMINATED)
2281ff2e
MD
283 return(ENXIO);
284 ++pti->pt_refs;
285 return(0);
286}
287
288/*
289 * pti_done() releases the reference and checks to see if both sides have
290 * been closed on a unix98 pty, allowing us to destroy the device and
291 * release resources.
292 *
293 * We do not release resources on non-unix98 ptys. Those are left
294 * statically allocated.
295 */
296static void
297pti_done(struct pt_ioctl *pti)
298{
22ff886e 299 lwkt_gettoken(&tty_token);
2281ff2e
MD
300 if (--pti->pt_refs == 0) {
301#ifdef UNIX98_PTYS
302 cdev_t dev;
303 int uminor_no;
304
305 /*
306 * Only unix09 ptys are freed up
307 */
f5f1bbd4 308 if ((pti->pt_flags & PF_UNIX98) == 0) {
22ff886e 309 lwkt_reltoken(&tty_token);
2281ff2e 310 return;
22ff886e 311 }
2281ff2e
MD
312
313 /*
314 * Interlock open attempts against termination by setting
315 * PF_TERMINATED. This allows us to block while cleaning
316 * out the device infrastructure.
449728b3
MD
317 *
318 * Do not terminate the tty if it still has a session
94a6eea8 319 * association (t_refs).
2281ff2e 320 */
f5f1bbd4 321 if ((pti->pt_flags & (PF_SOPEN|PF_MOPEN)) == 0 &&
94a6eea8 322 pti->pt_tty.t_refs == 0) {
f5f1bbd4 323 pti->pt_flags |= PF_TERMINATED;
2281ff2e
MD
324 uminor_no = pti->pt_uminor;
325
326 if ((dev = pti->devs) != NULL) {
327 dev->si_drv1 = NULL;
328 pti->devs = NULL;
329 destroy_dev(dev);
330 }
331 if ((dev = pti->devc) != NULL) {
332 dev->si_drv1 = NULL;
333 pti->devc = NULL;
334 destroy_dev(dev);
335 }
336 ttyunregister(&pti->pt_tty);
337 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(pty),
338 uminor_no);
339 kfree(pti, M_PTY);
340 }
341#endif
342 }
22ff886e 343 lwkt_reltoken(&tty_token);
2281ff2e
MD
344}
345
984263bc
MD
346/*ARGSUSED*/
347static int
fef8985e 348ptsopen(struct dev_open_args *ap)
984263bc 349{
b13267a5 350 cdev_t dev = ap->a_head.a_dev;
1fd87d54 351 struct tty *tp;
984263bc 352 int error;
984263bc
MD
353 struct pt_ioctl *pti;
354
2281ff2e
MD
355 /*
356 * The pti will already be assigned by the clone code or
357 * pre-created if a non-unix 98 pty. If si_drv1 is NULL
358 * we are somehow racing a unix98 termination.
359 */
360 if (dev->si_drv1 == NULL)
cd29885a 361 return(ENXIO);
984263bc 362 pti = dev->si_drv1;
22ff886e
AH
363
364 lwkt_gettoken(&tty_token);
365 if (pti_hold(pti)) {
366 lwkt_reltoken(&tty_token);
2281ff2e 367 return(ENXIO);
22ff886e 368 }
470b5de8 369
984263bc 370 tp = dev->si_tty;
470b5de8
MD
371
372 /*
373 * Reinit most of the tty state if it isn't open. Handle
374 * exclusive access.
375 */
984263bc
MD
376 if ((tp->t_state & TS_ISOPEN) == 0) {
377 ttychars(tp); /* Set up default chars */
378 tp->t_iflag = TTYDEF_IFLAG;
379 tp->t_oflag = TTYDEF_OFLAG;
380 tp->t_lflag = TTYDEF_LFLAG;
381 tp->t_cflag = TTYDEF_CFLAG;
382 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
470b5de8
MD
383 } else if ((tp->t_state & TS_XCLUDE) &&
384 priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) {
2281ff2e 385 pti_done(pti);
22ff886e 386 lwkt_reltoken(&tty_token);
984263bc 387 return (EBUSY);
fef8985e 388 } else if (pti->pt_prison != ap->a_cred->cr_prison) {
2281ff2e 389 pti_done(pti);
22ff886e 390 lwkt_reltoken(&tty_token);
984263bc
MD
391 return (EBUSY);
392 }
470b5de8
MD
393
394 /*
395 * If the ptc is already present this will connect us up. It
396 * is unclear if this is actually needed.
397 *
398 * If neither side is open be sure to clear any left over
399 * ZOMBIE state before continuing.
400 */
401 if (tp->t_oproc)
984263bc 402 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
f5f1bbd4 403 else if ((pti->pt_flags & PF_SOPEN) == 0)
470b5de8
MD
404 tp->t_state &= ~TS_ZOMBIE;
405
406 /*
407 * Wait for the carrier (ptc side)
408 */
984263bc 409 while ((tp->t_state & TS_CARR_ON) == 0) {
fef8985e 410 if (ap->a_oflags & FNONBLOCK)
984263bc 411 break;
377d4740 412 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ptsopn", 0);
2281ff2e
MD
413 if (error) {
414 pti_done(pti);
22ff886e 415 lwkt_reltoken(&tty_token);
984263bc 416 return (error);
2281ff2e 417 }
984263bc 418 }
cd29885a 419
c578a286 420 /*
470b5de8 421 * Mark the tty open and mark the slave side as being open.
c578a286 422 */
470b5de8 423 error = (*linesw[tp->t_line].l_open)(dev, tp);
c578a286 424
470b5de8 425 if (error == 0) {
f5f1bbd4
MD
426 pti->pt_flags |= PF_SOPEN;
427 pti->pt_flags &= ~PF_SCLOSED;
470b5de8 428 ptcwakeup(tp, FREAD|FWRITE);
cd29885a 429 }
2281ff2e 430 pti_done(pti);
cd29885a 431
22ff886e 432 lwkt_reltoken(&tty_token);
984263bc
MD
433 return (error);
434}
435
436static int
fef8985e 437ptsclose(struct dev_close_args *ap)
984263bc 438{
b13267a5 439 cdev_t dev = ap->a_head.a_dev;
1fd87d54 440 struct tty *tp;
c578a286 441 struct pt_ioctl *pti = dev->si_drv1;
984263bc 442 int err;
c578a286 443
22ff886e 444 lwkt_gettoken(&tty_token);
2281ff2e
MD
445 if (pti_hold(pti))
446 panic("ptsclose on terminated pti");
470b5de8
MD
447
448 /*
449 * Disconnect the slave side
450 */
c578a286
AH
451 tp = dev->si_tty;
452 err = (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
453 ptsstop(tp, FREAD|FWRITE);
470b5de8 454 ttyclose(tp); /* clears t_state */
c578a286 455
c578a286 456 /*
f5f1bbd4
MD
457 * Mark the pts side closed and signal the ptc. Do not mark the
458 * tty a zombie... that is, allow the tty to be re-opened as long
459 * as the ptc is still open. The ptc will read() EOFs until the
460 * pts side is reopened or the ptc is closed.
470b5de8 461 *
f5f1bbd4
MD
462 * xterm() depends on this behavior as it will revoke() the pts
463 * and then reopen it after the (unnecessary old code) chmod.
c578a286 464 */
f5f1bbd4
MD
465 pti->pt_flags &= ~PF_SOPEN;
466 pti->pt_flags |= PF_SCLOSED;
467 if (tp->t_oproc)
470b5de8 468 ptcwakeup(tp, FREAD);
2281ff2e 469 pti_done(pti);
22ff886e 470 lwkt_reltoken(&tty_token);
984263bc
MD
471 return (err);
472}
473
474static int
fef8985e 475ptsread(struct dev_read_args *ap)
984263bc 476{
b13267a5 477 cdev_t dev = ap->a_head.a_dev;
984263bc 478 struct proc *p = curproc;
1fd87d54
RG
479 struct tty *tp = dev->si_tty;
480 struct pt_ioctl *pti = dev->si_drv1;
08f2f1bb
SS
481 struct lwp *lp;
482
984263bc
MD
483 int error = 0;
484
08f2f1bb
SS
485 lp = curthread->td_lwp;
486
22ff886e 487 lwkt_gettoken(&tty_token);
984263bc
MD
488again:
489 if (pti->pt_flags & PF_REMOTE) {
490 while (isbackground(p, tp)) {
491 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
08f2f1bb 492 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
4643740a
MD
493 p->p_pgrp->pg_jobc == 0 ||
494 (p->p_flags & P_PPWAIT)) {
22ff886e 495 lwkt_reltoken(&tty_token);
984263bc 496 return (EIO);
22ff886e 497 }
984263bc 498 pgsignal(p->p_pgrp, SIGTTIN, 1);
377d4740 499 error = ttysleep(tp, &lbolt, PCATCH, "ptsbg", 0);
22ff886e
AH
500 if (error) {
501 lwkt_reltoken(&tty_token);
984263bc 502 return (error);
22ff886e 503 }
984263bc
MD
504 }
505 if (tp->t_canq.c_cc == 0) {
22ff886e
AH
506 if (ap->a_ioflag & IO_NDELAY) {
507 lwkt_reltoken(&tty_token);
984263bc 508 return (EWOULDBLOCK);
22ff886e 509 }
377d4740 510 error = ttysleep(tp, TSA_PTS_READ(tp), PCATCH,
984263bc 511 "ptsin", 0);
22ff886e
AH
512 if (error) {
513 lwkt_reltoken(&tty_token);
984263bc 514 return (error);
22ff886e 515 }
984263bc
MD
516 goto again;
517 }
fef8985e 518 while (tp->t_canq.c_cc > 1 && ap->a_uio->uio_resid > 0)
0ced1954 519 if (ureadc(clist_getc(&tp->t_canq), ap->a_uio) < 0) {
984263bc
MD
520 error = EFAULT;
521 break;
522 }
523 if (tp->t_canq.c_cc == 1)
0ced1954 524 clist_getc(&tp->t_canq);
22ff886e
AH
525 if (tp->t_canq.c_cc) {
526 lwkt_reltoken(&tty_token);
984263bc 527 return (error);
22ff886e 528 }
984263bc
MD
529 } else
530 if (tp->t_oproc)
fef8985e 531 error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
984263bc 532 ptcwakeup(tp, FWRITE);
22ff886e 533 lwkt_reltoken(&tty_token);
984263bc
MD
534 return (error);
535}
536
537/*
538 * Write to pseudo-tty.
539 * Wakeups of controlling tty will happen
540 * indirectly, when tty driver calls ptsstart.
541 */
542static int
fef8985e 543ptswrite(struct dev_write_args *ap)
984263bc 544{
b13267a5 545 cdev_t dev = ap->a_head.a_dev;
1fd87d54 546 struct tty *tp;
22ff886e 547 int ret;
984263bc 548
22ff886e 549 lwkt_gettoken(&tty_token);
984263bc 550 tp = dev->si_tty;
22ff886e
AH
551 if (tp->t_oproc == 0) {
552 lwkt_reltoken(&tty_token);
984263bc 553 return (EIO);
22ff886e
AH
554 }
555 ret = ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));
556 lwkt_reltoken(&tty_token);
557 return ret;
984263bc
MD
558}
559
560/*
561 * Start output on pseudo-tty.
562 * Wake up process selecting or sleeping for input from controlling tty.
563 */
564static void
c972a82f 565ptsstart(struct tty *tp)
984263bc 566{
22ff886e 567 lwkt_gettoken(&tty_token);
1fd87d54 568 struct pt_ioctl *pti = tp->t_dev->si_drv1;
984263bc 569
adb56101
MD
570 if (tp->t_state & TS_TTSTOP) {
571 lwkt_reltoken(&tty_token);
984263bc 572 return;
adb56101 573 }
1c375cd1
MD
574 if (pti) {
575 if (pti->pt_flags & PF_STOPPED) {
576 pti->pt_flags &= ~PF_STOPPED;
577 pti->pt_send = TIOCPKT_START;
578 }
984263bc
MD
579 }
580 ptcwakeup(tp, FREAD);
22ff886e 581 lwkt_reltoken(&tty_token);
984263bc
MD
582}
583
22ff886e
AH
584/*
585 * NOTE: Must be called with tty_token held
586 */
984263bc 587static void
c972a82f 588ptcwakeup(struct tty *tp, int flag)
984263bc 589{
22ff886e
AH
590 ASSERT_LWKT_TOKEN_HELD(&tty_token);
591
984263bc 592 if (flag & FREAD) {
984263bc 593 wakeup(TSA_PTC_READ(tp));
5b22f1a7 594 KNOTE(&tp->t_rkq.ki_note, 0);
984263bc
MD
595 }
596 if (flag & FWRITE) {
984263bc 597 wakeup(TSA_PTC_WRITE(tp));
5b22f1a7 598 KNOTE(&tp->t_wkq.ki_note, 0);
984263bc
MD
599 }
600}
601
602static int
fef8985e 603ptcopen(struct dev_open_args *ap)
984263bc 604{
b13267a5 605 cdev_t dev = ap->a_head.a_dev;
1fd87d54 606 struct tty *tp;
984263bc
MD
607 struct pt_ioctl *pti;
608
2281ff2e
MD
609 /*
610 * The pti will already be assigned by the clone code or
611 * pre-created if a non-unix 98 pty. If si_drv1 is NULL
612 * we are somehow racing a unix98 termination.
613 */
614 if (dev->si_drv1 == NULL)
22ff886e
AH
615 return(ENXIO);
616
617 lwkt_gettoken(&tty_token);
4062d050 618 pti = dev->si_drv1;
22ff886e
AH
619 if (pti_hold(pti)) {
620 lwkt_reltoken(&tty_token);
2281ff2e 621 return(ENXIO);
22ff886e 622 }
2281ff2e
MD
623 if (pti->pt_prison && pti->pt_prison != ap->a_cred->cr_prison) {
624 pti_done(pti);
22ff886e 625 lwkt_reltoken(&tty_token);
4062d050 626 return(EBUSY);
2281ff2e 627 }
984263bc 628 tp = dev->si_tty;
2281ff2e
MD
629 if (tp->t_oproc) {
630 pti_done(pti);
22ff886e 631 lwkt_reltoken(&tty_token);
984263bc 632 return (EIO);
2281ff2e 633 }
470b5de8
MD
634
635 /*
636 * If the slave side is not yet open clear any left over zombie
637 * state before doing our modem control.
638 */
f5f1bbd4 639 if ((pti->pt_flags & PF_SOPEN) == 0)
470b5de8
MD
640 tp->t_state &= ~TS_ZOMBIE;
641
984263bc
MD
642 tp->t_oproc = ptsstart;
643 tp->t_stop = ptsstop;
f5f1bbd4 644 tp->t_unhold = ptsunhold;
470b5de8
MD
645
646 /*
647 * Carrier on!
648 */
984263bc 649 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
470b5de8 650
984263bc 651 tp->t_lflag &= ~EXTPROC;
fef8985e 652 pti->pt_prison = ap->a_cred->cr_prison;
f5f1bbd4 653 pti->pt_flags &= ~PF_PTCSTATEMASK;
984263bc
MD
654 pti->pt_send = 0;
655 pti->pt_ucntl = 0;
4062d050 656
cd65363e 657 pti->devs->si_uid = ap->a_cred->cr_uid;
4062d050
MD
658 pti->devs->si_gid = 0;
659 pti->devs->si_perms = 0600;
660 pti->devc->si_uid = ap->a_cred->cr_uid;
661 pti->devc->si_gid = 0;
662 pti->devc->si_perms = 0600;
663
c578a286 664 /*
470b5de8
MD
665 * Mark master side open. This does not cause any events
666 * on the slave side.
c578a286 667 */
f5f1bbd4 668 pti->pt_flags |= PF_MOPEN;
2281ff2e 669 pti_done(pti);
c578a286 670
22ff886e 671 lwkt_reltoken(&tty_token);
984263bc
MD
672 return (0);
673}
674
675static int
fef8985e 676ptcclose(struct dev_close_args *ap)
984263bc 677{
b13267a5 678 cdev_t dev = ap->a_head.a_dev;
1fd87d54 679 struct tty *tp;
c578a286 680 struct pt_ioctl *pti = dev->si_drv1;
2281ff2e 681
22ff886e 682 lwkt_gettoken(&tty_token);
2281ff2e
MD
683 if (pti_hold(pti))
684 panic("ptcclose on terminated pti");
984263bc
MD
685
686 tp = dev->si_tty;
687 (void)(*linesw[tp->t_line].l_modem)(tp, 0);
688
689 /*
470b5de8
MD
690 * Mark the master side closed. If the slave is still open
691 * mark the tty ZOMBIE, preventing any new action until both
692 * sides have closed.
693 *
694 * NOTE: The ttyflush() will wake up the slave once we've
695 * set appropriate flags. The ZOMBIE flag will be
696 * cleared when the slave side is closed.
984263bc 697 */
f5f1bbd4
MD
698 pti->pt_flags &= ~PF_MOPEN;
699 if (pti->pt_flags & PF_SOPEN)
984263bc 700 tp->t_state |= TS_ZOMBIE;
4062d050 701
2281ff2e 702 /*
470b5de8
MD
703 * Turn off the carrier and disconnect. This will notify the slave
704 * side.
2281ff2e 705 */
470b5de8
MD
706 if (tp->t_state & TS_ISOPEN) {
707 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
708 ttyflush(tp, FREAD | FWRITE);
709 }
710 tp->t_oproc = NULL; /* mark closed */
2281ff2e 711
4062d050
MD
712 pti->pt_prison = NULL;
713 pti->devs->si_uid = 0;
714 pti->devs->si_gid = 0;
715 pti->devs->si_perms = 0666;
716 pti->devc->si_uid = 0;
717 pti->devc->si_gid = 0;
718 pti->devc->si_perms = 0666;
719
2281ff2e 720 pti_done(pti);
22ff886e
AH
721
722 lwkt_reltoken(&tty_token);
984263bc
MD
723 return (0);
724}
725
726static int
fef8985e 727ptcread(struct dev_read_args *ap)
984263bc 728{
b13267a5 729 cdev_t dev = ap->a_head.a_dev;
1fd87d54 730 struct tty *tp = dev->si_tty;
984263bc
MD
731 struct pt_ioctl *pti = dev->si_drv1;
732 char buf[BUFSIZ];
733 int error = 0, cc;
734
22ff886e 735 lwkt_gettoken(&tty_token);
984263bc
MD
736 /*
737 * We want to block until the slave
738 * is open, and there's something to read;
739 * but if we lost the slave or we're NBIO,
740 * then return the appropriate error instead.
741 */
742 for (;;) {
743 if (tp->t_state&TS_ISOPEN) {
f5f1bbd4 744 if ((pti->pt_flags & PF_PKT) && pti->pt_send) {
fef8985e 745 error = ureadc((int)pti->pt_send, ap->a_uio);
22ff886e
AH
746 if (error) {
747 lwkt_reltoken(&tty_token);
984263bc 748 return (error);
22ff886e 749 }
984263bc 750 if (pti->pt_send & TIOCPKT_IOCTL) {
e54488bb
MD
751 cc = (int)szmin(ap->a_uio->uio_resid,
752 sizeof(tp->t_termios));
984263bc 753 uiomove((caddr_t)&tp->t_termios, cc,
fef8985e 754 ap->a_uio);
984263bc
MD
755 }
756 pti->pt_send = 0;
22ff886e 757 lwkt_reltoken(&tty_token);
984263bc
MD
758 return (0);
759 }
f5f1bbd4 760 if ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl) {
fef8985e 761 error = ureadc((int)pti->pt_ucntl, ap->a_uio);
22ff886e
AH
762 if (error) {
763 lwkt_reltoken(&tty_token);
984263bc 764 return (error);
22ff886e 765 }
984263bc 766 pti->pt_ucntl = 0;
22ff886e 767 lwkt_reltoken(&tty_token);
984263bc
MD
768 return (0);
769 }
770 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
771 break;
772 }
22ff886e
AH
773 if ((tp->t_state & TS_CONNECTED) == 0) {
774 lwkt_reltoken(&tty_token);
984263bc 775 return (0); /* EOF */
22ff886e
AH
776 }
777 if (ap->a_ioflag & IO_NDELAY) {
778 lwkt_reltoken(&tty_token);
984263bc 779 return (EWOULDBLOCK);
22ff886e 780 }
377d4740 781 error = tsleep(TSA_PTC_READ(tp), PCATCH, "ptcin", 0);
22ff886e
AH
782 if (error) {
783 lwkt_reltoken(&tty_token);
984263bc 784 return (error);
22ff886e 785 }
984263bc
MD
786 }
787 if (pti->pt_flags & (PF_PKT|PF_UCNTL))
fef8985e
MD
788 error = ureadc(0, ap->a_uio);
789 while (ap->a_uio->uio_resid > 0 && error == 0) {
e54488bb
MD
790 cc = q_to_b(&tp->t_outq, buf,
791 (int)szmin(ap->a_uio->uio_resid, BUFSIZ));
984263bc
MD
792 if (cc <= 0)
793 break;
e54488bb 794 error = uiomove(buf, (size_t)cc, ap->a_uio);
984263bc
MD
795 }
796 ttwwakeup(tp);
22ff886e 797 lwkt_reltoken(&tty_token);
984263bc
MD
798 return (error);
799}
800
801static void
c972a82f 802ptsstop(struct tty *tp, int flush)
984263bc
MD
803{
804 struct pt_ioctl *pti = tp->t_dev->si_drv1;
805 int flag;
806
22ff886e 807 lwkt_gettoken(&tty_token);
984263bc 808 /* note: FLUSHREAD and FLUSHWRITE already ok */
1c375cd1
MD
809 if (pti) {
810 if (flush == 0) {
811 flush = TIOCPKT_STOP;
812 pti->pt_flags |= PF_STOPPED;
813 } else {
814 pti->pt_flags &= ~PF_STOPPED;
815 }
816 pti->pt_send |= flush;
817 /* change of perspective */
818 }
984263bc
MD
819 flag = 0;
820 if (flush & FREAD)
821 flag |= FWRITE;
822 if (flush & FWRITE)
823 flag |= FREAD;
824 ptcwakeup(tp, flag);
22ff886e
AH
825
826 lwkt_reltoken(&tty_token);
984263bc
MD
827}
828
8acdf1cf 829/*
f5f1bbd4
MD
830 * ttyunhold() calls us instead of just decrementing tp->t_refs. This
831 * is needed because a session can hold onto a pts (half closed state)
832 * even if there are no live file descriptors. Without the callback
833 * we can't clean up.
834 */
835static void
836ptsunhold(struct tty *tp)
837{
838 struct pt_ioctl *pti = tp->t_dev->si_drv1;
839
840 lwkt_gettoken(&tty_token);
841 pti_hold(pti);
842 --tp->t_refs;
843 pti_done(pti);
844 lwkt_reltoken(&tty_token);
845}
846
847/*
8acdf1cf
MD
848 * kqueue ops for pseudo-terminals.
849 */
850static struct filterops ptcread_filtops =
a081e067 851 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_ptcrdetach, filt_ptcread };
8acdf1cf 852static struct filterops ptcwrite_filtops =
a081e067 853 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_ptcwdetach, filt_ptcwrite };
8acdf1cf
MD
854
855static int
856ptckqfilter(struct dev_kqfilter_args *ap)
857{
858 cdev_t dev = ap->a_head.a_dev;
859 struct knote *kn = ap->a_kn;
860 struct tty *tp = dev->si_tty;
861 struct klist *klist;
862
22ff886e 863 lwkt_gettoken(&tty_token);
8acdf1cf
MD
864 ap->a_result = 0;
865 switch (kn->kn_filter) {
866 case EVFILT_READ:
5b22f1a7 867 klist = &tp->t_rkq.ki_note;
8acdf1cf
MD
868 kn->kn_fop = &ptcread_filtops;
869 break;
870 case EVFILT_WRITE:
5b22f1a7 871 klist = &tp->t_wkq.ki_note;
8acdf1cf
MD
872 kn->kn_fop = &ptcwrite_filtops;
873 break;
874 default:
b287d649 875 ap->a_result = EOPNOTSUPP;
22ff886e 876 lwkt_reltoken(&tty_token);
8acdf1cf
MD
877 return (0);
878 }
879
880 kn->kn_hook = (caddr_t)dev;
5b22f1a7 881 knote_insert(klist, kn);
22ff886e 882 lwkt_reltoken(&tty_token);
8acdf1cf
MD
883 return (0);
884}
885
886static int
887filt_ptcread (struct knote *kn, long hint)
888{
889 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
890 struct pt_ioctl *pti = ((cdev_t)kn->kn_hook)->si_drv1;
891
22ff886e 892 lwkt_gettoken(&tty_token);
f5f1bbd4 893 if ((tp->t_state & TS_ZOMBIE) || (pti->pt_flags & PF_SCLOSED)) {
3bcb6e5e 894 kn->kn_flags |= (EV_EOF | EV_NODATA);
22ff886e 895 lwkt_reltoken(&tty_token);
847ff8ce
SG
896 return (1);
897 }
898
8acdf1cf
MD
899 if ((tp->t_state & TS_ISOPEN) &&
900 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
901 ((pti->pt_flags & PF_PKT) && pti->pt_send) ||
902 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) {
903 kn->kn_data = tp->t_outq.c_cc;
22ff886e 904 lwkt_reltoken(&tty_token);
8acdf1cf
MD
905 return(1);
906 } else {
22ff886e 907 lwkt_reltoken(&tty_token);
8acdf1cf
MD
908 return(0);
909 }
910}
911
912static int
913filt_ptcwrite (struct knote *kn, long hint)
914{
915 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
916 struct pt_ioctl *pti = ((cdev_t)kn->kn_hook)->si_drv1;
917
22ff886e 918 lwkt_gettoken(&tty_token);
847ff8ce 919 if (tp->t_state & TS_ZOMBIE) {
3bcb6e5e 920 kn->kn_flags |= (EV_EOF | EV_NODATA);
22ff886e 921 lwkt_reltoken(&tty_token);
847ff8ce
SG
922 return (1);
923 }
924
8acdf1cf
MD
925 if (tp->t_state & TS_ISOPEN &&
926 ((pti->pt_flags & PF_REMOTE) ?
927 (tp->t_canq.c_cc == 0) :
928 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
929 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) {
930 kn->kn_data = tp->t_canq.c_cc + tp->t_rawq.c_cc;
22ff886e 931 lwkt_reltoken(&tty_token);
8acdf1cf
MD
932 return(1);
933 } else {
22ff886e 934 lwkt_reltoken(&tty_token);
8acdf1cf
MD
935 return(0);
936 }
22ff886e 937 /* NOTREACHED */
8acdf1cf
MD
938}
939
940static void
941filt_ptcrdetach (struct knote *kn)
942{
943 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
944
5b22f1a7 945 knote_remove(&tp->t_rkq.ki_note, kn);
8acdf1cf
MD
946}
947
948static void
949filt_ptcwdetach (struct knote *kn)
950{
951 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
952
5b22f1a7 953 knote_remove(&tp->t_wkq.ki_note, kn);
8acdf1cf
MD
954}
955
956/*
957 * I/O ops
958 */
984263bc 959static int
fef8985e 960ptcwrite(struct dev_write_args *ap)
984263bc 961{
b13267a5 962 cdev_t dev = ap->a_head.a_dev;
1fd87d54
RG
963 struct tty *tp = dev->si_tty;
964 u_char *cp = 0;
965 int cc = 0;
984263bc
MD
966 u_char locbuf[BUFSIZ];
967 int cnt = 0;
968 struct pt_ioctl *pti = dev->si_drv1;
969 int error = 0;
970
22ff886e 971 lwkt_gettoken(&tty_token);
984263bc
MD
972again:
973 if ((tp->t_state&TS_ISOPEN) == 0)
974 goto block;
975 if (pti->pt_flags & PF_REMOTE) {
976 if (tp->t_canq.c_cc)
977 goto block;
fef8985e 978 while ((ap->a_uio->uio_resid > 0 || cc > 0) &&
984263bc
MD
979 tp->t_canq.c_cc < TTYHOG - 1) {
980 if (cc == 0) {
e54488bb
MD
981 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
982 cc = imin(cc, TTYHOG - 1 - tp->t_canq.c_cc);
984263bc 983 cp = locbuf;
e54488bb 984 error = uiomove(cp, (size_t)cc, ap->a_uio);
22ff886e
AH
985 if (error) {
986 lwkt_reltoken(&tty_token);
984263bc 987 return (error);
22ff886e 988 }
984263bc
MD
989 /* check again for safety */
990 if ((tp->t_state & TS_ISOPEN) == 0) {
991 /* adjust as usual */
fef8985e 992 ap->a_uio->uio_resid += cc;
22ff886e 993 lwkt_reltoken(&tty_token);
984263bc
MD
994 return (EIO);
995 }
996 }
997 if (cc > 0) {
998 cc = b_to_q((char *)cp, cc, &tp->t_canq);
999 /*
1000 * XXX we don't guarantee that the canq size
1001 * is >= TTYHOG, so the above b_to_q() may
1002 * leave some bytes uncopied. However, space
1003 * is guaranteed for the null terminator if
1004 * we don't fail here since (TTYHOG - 1) is
1005 * not a multiple of CBSIZE.
1006 */
1007 if (cc > 0)
1008 break;
1009 }
1010 }
1011 /* adjust for data copied in but not written */
fef8985e 1012 ap->a_uio->uio_resid += cc;
0ced1954 1013 clist_putc(0, &tp->t_canq);
984263bc
MD
1014 ttwakeup(tp);
1015 wakeup(TSA_PTS_READ(tp));
22ff886e 1016 lwkt_reltoken(&tty_token);
984263bc
MD
1017 return (0);
1018 }
fef8985e 1019 while (ap->a_uio->uio_resid > 0 || cc > 0) {
984263bc 1020 if (cc == 0) {
e54488bb 1021 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
984263bc 1022 cp = locbuf;
e54488bb 1023 error = uiomove(cp, (size_t)cc, ap->a_uio);
22ff886e
AH
1024 if (error) {
1025 lwkt_reltoken(&tty_token);
984263bc 1026 return (error);
22ff886e 1027 }
984263bc
MD
1028 /* check again for safety */
1029 if ((tp->t_state & TS_ISOPEN) == 0) {
1030 /* adjust for data copied in but not written */
fef8985e 1031 ap->a_uio->uio_resid += cc;
22ff886e 1032 lwkt_reltoken(&tty_token);
984263bc
MD
1033 return (EIO);
1034 }
1035 }
1036 while (cc > 0) {
1037 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
1038 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
1039 wakeup(TSA_HUP_OR_INPUT(tp));
1040 goto block;
1041 }
1042 (*linesw[tp->t_line].l_rint)(*cp++, tp);
1043 cnt++;
1044 cc--;
1045 }
1046 cc = 0;
1047 }
22ff886e 1048 lwkt_reltoken(&tty_token);
984263bc
MD
1049 return (0);
1050block:
1051 /*
1052 * Come here to wait for slave to open, for space
1053 * in outq, or space in rawq, or an empty canq.
1054 */
1055 if ((tp->t_state & TS_CONNECTED) == 0) {
1056 /* adjust for data copied in but not written */
fef8985e 1057 ap->a_uio->uio_resid += cc;
22ff886e 1058 lwkt_reltoken(&tty_token);
984263bc
MD
1059 return (EIO);
1060 }
fef8985e 1061 if (ap->a_ioflag & IO_NDELAY) {
984263bc 1062 /* adjust for data copied in but not written */
fef8985e 1063 ap->a_uio->uio_resid += cc;
22ff886e
AH
1064 if (cnt == 0) {
1065 lwkt_reltoken(&tty_token);
984263bc 1066 return (EWOULDBLOCK);
22ff886e
AH
1067 }
1068 lwkt_reltoken(&tty_token);
984263bc
MD
1069 return (0);
1070 }
377d4740 1071 error = tsleep(TSA_PTC_WRITE(tp), PCATCH, "ptcout", 0);
984263bc
MD
1072 if (error) {
1073 /* adjust for data copied in but not written */
fef8985e 1074 ap->a_uio->uio_resid += cc;
22ff886e 1075 lwkt_reltoken(&tty_token);
984263bc
MD
1076 return (error);
1077 }
1078 goto again;
1079}
1080
1081/*ARGSUSED*/
1082static int
fef8985e 1083ptyioctl(struct dev_ioctl_args *ap)
984263bc 1084{
b13267a5 1085 cdev_t dev = ap->a_head.a_dev;
1fd87d54
RG
1086 struct tty *tp = dev->si_tty;
1087 struct pt_ioctl *pti = dev->si_drv1;
1088 u_char *cc = tp->t_cc;
984263bc
MD
1089 int stop, error;
1090
22ff886e 1091 lwkt_gettoken(&tty_token);
335dda38 1092 if (dev_dflags(dev) & D_MASTER) {
fef8985e 1093 switch (ap->a_cmd) {
984263bc
MD
1094
1095 case TIOCGPGRP:
1096 /*
1097 * We avoid calling ttioctl on the controller since,
1098 * in that case, tp must be the controlling terminal.
1099 */
fef8985e 1100 *(int *)ap->a_data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
22ff886e 1101 lwkt_reltoken(&tty_token);
984263bc
MD
1102 return (0);
1103
1104 case TIOCPKT:
fef8985e 1105 if (*(int *)ap->a_data) {
22ff886e
AH
1106 if (pti->pt_flags & PF_UCNTL) {
1107 lwkt_reltoken(&tty_token);
984263bc 1108 return (EINVAL);
22ff886e 1109 }
984263bc 1110 pti->pt_flags |= PF_PKT;
f5f1bbd4 1111 } else {
984263bc 1112 pti->pt_flags &= ~PF_PKT;
f5f1bbd4 1113 }
22ff886e 1114 lwkt_reltoken(&tty_token);
984263bc
MD
1115 return (0);
1116
1117 case TIOCUCNTL:
fef8985e 1118 if (*(int *)ap->a_data) {
22ff886e
AH
1119 if (pti->pt_flags & PF_PKT) {
1120 lwkt_reltoken(&tty_token);
984263bc 1121 return (EINVAL);
22ff886e 1122 }
984263bc 1123 pti->pt_flags |= PF_UCNTL;
f5f1bbd4 1124 } else {
984263bc 1125 pti->pt_flags &= ~PF_UCNTL;
f5f1bbd4 1126 }
22ff886e 1127 lwkt_reltoken(&tty_token);
984263bc
MD
1128 return (0);
1129
1130 case TIOCREMOTE:
fef8985e 1131 if (*(int *)ap->a_data)
984263bc
MD
1132 pti->pt_flags |= PF_REMOTE;
1133 else
1134 pti->pt_flags &= ~PF_REMOTE;
1135 ttyflush(tp, FREAD|FWRITE);
22ff886e 1136 lwkt_reltoken(&tty_token);
984263bc 1137 return (0);
c578a286 1138
22ff886e 1139#ifdef UNIX98_PTYS
c578a286 1140 case TIOCISPTMASTER:
f5f1bbd4 1141 if ((pti->pt_flags & PF_UNIX98) &&
470b5de8 1142 (pti->devc == dev)) {
22ff886e 1143 lwkt_reltoken(&tty_token);
c578a286 1144 return (0);
22ff886e
AH
1145 } else {
1146 lwkt_reltoken(&tty_token);
c578a286 1147 return (EINVAL);
22ff886e 1148 }
984263bc 1149 }
22ff886e 1150#endif
984263bc
MD
1151
1152 /*
1153 * The rest of the ioctls shouldn't be called until
1154 * the slave is open.
1155 */
22ff886e
AH
1156 if ((tp->t_state & TS_ISOPEN) == 0) {
1157 lwkt_reltoken(&tty_token);
984263bc 1158 return (EAGAIN);
22ff886e 1159 }
984263bc 1160
fef8985e 1161 switch (ap->a_cmd) {
984263bc
MD
1162#ifdef COMPAT_43
1163 case TIOCSETP:
1164 case TIOCSETN:
1165#endif
1166 case TIOCSETD:
1167 case TIOCSETA:
1168 case TIOCSETAW:
1169 case TIOCSETAF:
1170 /*
1171 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
1172 * ttywflush(tp) will hang if there are characters in
1173 * the outq.
1174 */
1175 ndflush(&tp->t_outq, tp->t_outq.c_cc);
1176 break;
1177
1178 case TIOCSIG:
fef8985e 1179 if (*(unsigned int *)ap->a_data >= NSIG ||
22ff886e
AH
1180 *(unsigned int *)ap->a_data == 0) {
1181 lwkt_reltoken(&tty_token);
984263bc 1182 return(EINVAL);
22ff886e 1183 }
984263bc
MD
1184 if ((tp->t_lflag&NOFLSH) == 0)
1185 ttyflush(tp, FREAD|FWRITE);
fef8985e
MD
1186 pgsignal(tp->t_pgrp, *(unsigned int *)ap->a_data, 1);
1187 if ((*(unsigned int *)ap->a_data == SIGINFO) &&
984263bc
MD
1188 ((tp->t_lflag&NOKERNINFO) == 0))
1189 ttyinfo(tp);
22ff886e 1190 lwkt_reltoken(&tty_token);
984263bc
MD
1191 return(0);
1192 }
1193 }
fef8985e 1194 if (ap->a_cmd == TIOCEXT) {
984263bc
MD
1195 /*
1196 * When the EXTPROC bit is being toggled, we need
1197 * to send an TIOCPKT_IOCTL if the packet driver
1198 * is turned on.
1199 */
fef8985e 1200 if (*(int *)ap->a_data) {
984263bc
MD
1201 if (pti->pt_flags & PF_PKT) {
1202 pti->pt_send |= TIOCPKT_IOCTL;
1203 ptcwakeup(tp, FREAD);
1204 }
1205 tp->t_lflag |= EXTPROC;
1206 } else {
1207 if ((tp->t_lflag & EXTPROC) &&
1208 (pti->pt_flags & PF_PKT)) {
1209 pti->pt_send |= TIOCPKT_IOCTL;
1210 ptcwakeup(tp, FREAD);
1211 }
1212 tp->t_lflag &= ~EXTPROC;
1213 }
22ff886e 1214 lwkt_reltoken(&tty_token);
984263bc
MD
1215 return(0);
1216 }
fef8985e
MD
1217 error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
1218 ap->a_fflag, ap->a_cred);
984263bc 1219 if (error == ENOIOCTL)
fef8985e 1220 error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
984263bc
MD
1221 if (error == ENOIOCTL) {
1222 if (pti->pt_flags & PF_UCNTL &&
fef8985e
MD
1223 (ap->a_cmd & ~0xff) == UIOCCMD(0)) {
1224 if (ap->a_cmd & 0xff) {
1225 pti->pt_ucntl = (u_char)ap->a_cmd;
984263bc
MD
1226 ptcwakeup(tp, FREAD);
1227 }
22ff886e 1228 lwkt_reltoken(&tty_token);
984263bc
MD
1229 return (0);
1230 }
1231 error = ENOTTY;
1232 }
1233 /*
1234 * If external processing and packet mode send ioctl packet.
1235 */
1236 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
fef8985e 1237 switch(ap->a_cmd) {
984263bc
MD
1238 case TIOCSETA:
1239 case TIOCSETAW:
1240 case TIOCSETAF:
1241#ifdef COMPAT_43
1242 case TIOCSETP:
1243 case TIOCSETN:
1244#endif
1245#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1246 case TIOCSETC:
1247 case TIOCSLTC:
1248 case TIOCLBIS:
1249 case TIOCLBIC:
1250 case TIOCLSET:
1251#endif
1252 pti->pt_send |= TIOCPKT_IOCTL;
1253 ptcwakeup(tp, FREAD);
1254 default:
1255 break;
1256 }
1257 }
1258 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
1259 && CCEQ(cc[VSTART], CTRL('q'));
1260 if (pti->pt_flags & PF_NOSTOP) {
1261 if (stop) {
1262 pti->pt_send &= ~TIOCPKT_NOSTOP;
1263 pti->pt_send |= TIOCPKT_DOSTOP;
1264 pti->pt_flags &= ~PF_NOSTOP;
1265 ptcwakeup(tp, FREAD);
1266 }
1267 } else {
1268 if (!stop) {
1269 pti->pt_send &= ~TIOCPKT_DOSTOP;
1270 pti->pt_send |= TIOCPKT_NOSTOP;
1271 pti->pt_flags |= PF_NOSTOP;
1272 ptcwakeup(tp, FREAD);
1273 }
1274 }
22ff886e 1275 lwkt_reltoken(&tty_token);
984263bc
MD
1276 return (error);
1277}
1278
1279
402ed7e1 1280static void ptc_drvinit (void *unused);
984263bc 1281
c578a286
AH
1282#ifdef UNIX98_PTYS
1283SYSCTL_INT(_kern, OID_AUTO, pty_debug, CTLFLAG_RW, &pty_debug_level,
1284 0, "Change pty debug level");
1285#endif
1286
984263bc 1287static void
c972a82f 1288ptc_drvinit(void *unused)
984263bc 1289{
cd29885a 1290 int i;
cd29885a 1291
c578a286
AH
1292#ifdef UNIX98_PTYS
1293 /*
1294 * Unix98 pty stuff.
1295 * Create the clonable base device.
1296 */
1297 make_autoclone_dev(&ptc_ops, &DEVFS_CLONE_BITMAP(pty), ptyclone,
1298 0, 0, 0666, "ptmx");
cd29885a 1299#endif
c578a286 1300
cd29885a
MD
1301 for (i = 0; i < 256; i++) {
1302 ptyinit(i);
1303 }
984263bc
MD
1304}
1305
1306SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)