kevent: Restore old EV_EOF semantics
[dragonfly.git] / sys / kern / tty_pty.c
CommitLineData
984263bc 1/*
22ff886e
AH
2 * (MPSAFE)
3 *
984263bc
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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
22ff886e
AH
39/*
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
984263bc
MD
47/*
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
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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
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61#include <sys/tty.h>
62#include <sys/conf.h>
63#include <sys/fcntl.h>
984263bc
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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
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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
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156 int pt_refs; /* Structural references interlock S/MOPEN */
157 int pt_uminor;
5b22f1a7 158 struct kqinfo pt_kqr, pt_kqw;
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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
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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
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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;
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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
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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 */
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221 ttyregister(&pt->pt_tty);
222}
223
c578a286 224#ifdef UNIX98_PTYS
cd29885a
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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) ||
22ff886e
AH
493 p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) {
494 lwkt_reltoken(&tty_token);
984263bc 495 return (EIO);
22ff886e 496 }
984263bc 497 pgsignal(p->p_pgrp, SIGTTIN, 1);
377d4740 498 error = ttysleep(tp, &lbolt, PCATCH, "ptsbg", 0);
22ff886e
AH
499 if (error) {
500 lwkt_reltoken(&tty_token);
984263bc 501 return (error);
22ff886e 502 }
984263bc
MD
503 }
504 if (tp->t_canq.c_cc == 0) {
22ff886e
AH
505 if (ap->a_ioflag & IO_NDELAY) {
506 lwkt_reltoken(&tty_token);
984263bc 507 return (EWOULDBLOCK);
22ff886e 508 }
377d4740 509 error = ttysleep(tp, TSA_PTS_READ(tp), PCATCH,
984263bc 510 "ptsin", 0);
22ff886e
AH
511 if (error) {
512 lwkt_reltoken(&tty_token);
984263bc 513 return (error);
22ff886e 514 }
984263bc
MD
515 goto again;
516 }
fef8985e 517 while (tp->t_canq.c_cc > 1 && ap->a_uio->uio_resid > 0)
0ced1954 518 if (ureadc(clist_getc(&tp->t_canq), ap->a_uio) < 0) {
984263bc
MD
519 error = EFAULT;
520 break;
521 }
522 if (tp->t_canq.c_cc == 1)
0ced1954 523 clist_getc(&tp->t_canq);
22ff886e
AH
524 if (tp->t_canq.c_cc) {
525 lwkt_reltoken(&tty_token);
984263bc 526 return (error);
22ff886e 527 }
984263bc
MD
528 } else
529 if (tp->t_oproc)
fef8985e 530 error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
984263bc 531 ptcwakeup(tp, FWRITE);
22ff886e 532 lwkt_reltoken(&tty_token);
984263bc
MD
533 return (error);
534}
535
536/*
537 * Write to pseudo-tty.
538 * Wakeups of controlling tty will happen
539 * indirectly, when tty driver calls ptsstart.
540 */
541static int
fef8985e 542ptswrite(struct dev_write_args *ap)
984263bc 543{
b13267a5 544 cdev_t dev = ap->a_head.a_dev;
1fd87d54 545 struct tty *tp;
22ff886e 546 int ret;
984263bc 547
22ff886e 548 lwkt_gettoken(&tty_token);
984263bc 549 tp = dev->si_tty;
22ff886e
AH
550 if (tp->t_oproc == 0) {
551 lwkt_reltoken(&tty_token);
984263bc 552 return (EIO);
22ff886e
AH
553 }
554 ret = ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));
555 lwkt_reltoken(&tty_token);
556 return ret;
984263bc
MD
557}
558
559/*
560 * Start output on pseudo-tty.
561 * Wake up process selecting or sleeping for input from controlling tty.
562 */
563static void
c972a82f 564ptsstart(struct tty *tp)
984263bc 565{
22ff886e 566 lwkt_gettoken(&tty_token);
1fd87d54 567 struct pt_ioctl *pti = tp->t_dev->si_drv1;
984263bc 568
adb56101
MD
569 if (tp->t_state & TS_TTSTOP) {
570 lwkt_reltoken(&tty_token);
984263bc 571 return;
adb56101 572 }
1c375cd1
MD
573 if (pti) {
574 if (pti->pt_flags & PF_STOPPED) {
575 pti->pt_flags &= ~PF_STOPPED;
576 pti->pt_send = TIOCPKT_START;
577 }
984263bc
MD
578 }
579 ptcwakeup(tp, FREAD);
22ff886e 580 lwkt_reltoken(&tty_token);
984263bc
MD
581}
582
22ff886e
AH
583/*
584 * NOTE: Must be called with tty_token held
585 */
984263bc 586static void
c972a82f 587ptcwakeup(struct tty *tp, int flag)
984263bc 588{
22ff886e
AH
589 ASSERT_LWKT_TOKEN_HELD(&tty_token);
590
984263bc 591 if (flag & FREAD) {
984263bc 592 wakeup(TSA_PTC_READ(tp));
5b22f1a7 593 KNOTE(&tp->t_rkq.ki_note, 0);
984263bc
MD
594 }
595 if (flag & FWRITE) {
984263bc 596 wakeup(TSA_PTC_WRITE(tp));
5b22f1a7 597 KNOTE(&tp->t_wkq.ki_note, 0);
984263bc
MD
598 }
599}
600
601static int
fef8985e 602ptcopen(struct dev_open_args *ap)
984263bc 603{
b13267a5 604 cdev_t dev = ap->a_head.a_dev;
1fd87d54 605 struct tty *tp;
984263bc
MD
606 struct pt_ioctl *pti;
607
2281ff2e
MD
608 /*
609 * The pti will already be assigned by the clone code or
610 * pre-created if a non-unix 98 pty. If si_drv1 is NULL
611 * we are somehow racing a unix98 termination.
612 */
613 if (dev->si_drv1 == NULL)
22ff886e
AH
614 return(ENXIO);
615
616 lwkt_gettoken(&tty_token);
4062d050 617 pti = dev->si_drv1;
22ff886e
AH
618 if (pti_hold(pti)) {
619 lwkt_reltoken(&tty_token);
2281ff2e 620 return(ENXIO);
22ff886e 621 }
2281ff2e
MD
622 if (pti->pt_prison && pti->pt_prison != ap->a_cred->cr_prison) {
623 pti_done(pti);
22ff886e 624 lwkt_reltoken(&tty_token);
4062d050 625 return(EBUSY);
2281ff2e 626 }
984263bc 627 tp = dev->si_tty;
2281ff2e
MD
628 if (tp->t_oproc) {
629 pti_done(pti);
22ff886e 630 lwkt_reltoken(&tty_token);
984263bc 631 return (EIO);
2281ff2e 632 }
470b5de8
MD
633
634 /*
635 * If the slave side is not yet open clear any left over zombie
636 * state before doing our modem control.
637 */
f5f1bbd4 638 if ((pti->pt_flags & PF_SOPEN) == 0)
470b5de8
MD
639 tp->t_state &= ~TS_ZOMBIE;
640
984263bc
MD
641 tp->t_oproc = ptsstart;
642 tp->t_stop = ptsstop;
f5f1bbd4 643 tp->t_unhold = ptsunhold;
470b5de8
MD
644
645 /*
646 * Carrier on!
647 */
984263bc 648 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
470b5de8 649
984263bc 650 tp->t_lflag &= ~EXTPROC;
fef8985e 651 pti->pt_prison = ap->a_cred->cr_prison;
f5f1bbd4 652 pti->pt_flags &= ~PF_PTCSTATEMASK;
984263bc
MD
653 pti->pt_send = 0;
654 pti->pt_ucntl = 0;
4062d050 655
cd65363e 656 pti->devs->si_uid = ap->a_cred->cr_uid;
4062d050
MD
657 pti->devs->si_gid = 0;
658 pti->devs->si_perms = 0600;
659 pti->devc->si_uid = ap->a_cred->cr_uid;
660 pti->devc->si_gid = 0;
661 pti->devc->si_perms = 0600;
662
c578a286 663 /*
470b5de8
MD
664 * Mark master side open. This does not cause any events
665 * on the slave side.
c578a286 666 */
f5f1bbd4 667 pti->pt_flags |= PF_MOPEN;
2281ff2e 668 pti_done(pti);
c578a286 669
22ff886e 670 lwkt_reltoken(&tty_token);
984263bc
MD
671 return (0);
672}
673
674static int
fef8985e 675ptcclose(struct dev_close_args *ap)
984263bc 676{
b13267a5 677 cdev_t dev = ap->a_head.a_dev;
1fd87d54 678 struct tty *tp;
c578a286 679 struct pt_ioctl *pti = dev->si_drv1;
2281ff2e 680
22ff886e 681 lwkt_gettoken(&tty_token);
2281ff2e
MD
682 if (pti_hold(pti))
683 panic("ptcclose on terminated pti");
984263bc
MD
684
685 tp = dev->si_tty;
686 (void)(*linesw[tp->t_line].l_modem)(tp, 0);
687
688 /*
470b5de8
MD
689 * Mark the master side closed. If the slave is still open
690 * mark the tty ZOMBIE, preventing any new action until both
691 * sides have closed.
692 *
693 * NOTE: The ttyflush() will wake up the slave once we've
694 * set appropriate flags. The ZOMBIE flag will be
695 * cleared when the slave side is closed.
984263bc 696 */
f5f1bbd4
MD
697 pti->pt_flags &= ~PF_MOPEN;
698 if (pti->pt_flags & PF_SOPEN)
984263bc 699 tp->t_state |= TS_ZOMBIE;
4062d050 700
2281ff2e 701 /*
470b5de8
MD
702 * Turn off the carrier and disconnect. This will notify the slave
703 * side.
2281ff2e 704 */
470b5de8
MD
705 if (tp->t_state & TS_ISOPEN) {
706 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
707 ttyflush(tp, FREAD | FWRITE);
708 }
709 tp->t_oproc = NULL; /* mark closed */
2281ff2e 710
4062d050
MD
711 pti->pt_prison = NULL;
712 pti->devs->si_uid = 0;
713 pti->devs->si_gid = 0;
714 pti->devs->si_perms = 0666;
715 pti->devc->si_uid = 0;
716 pti->devc->si_gid = 0;
717 pti->devc->si_perms = 0666;
718
2281ff2e 719 pti_done(pti);
22ff886e
AH
720
721 lwkt_reltoken(&tty_token);
984263bc
MD
722 return (0);
723}
724
725static int
fef8985e 726ptcread(struct dev_read_args *ap)
984263bc 727{
b13267a5 728 cdev_t dev = ap->a_head.a_dev;
1fd87d54 729 struct tty *tp = dev->si_tty;
984263bc
MD
730 struct pt_ioctl *pti = dev->si_drv1;
731 char buf[BUFSIZ];
732 int error = 0, cc;
733
22ff886e 734 lwkt_gettoken(&tty_token);
984263bc
MD
735 /*
736 * We want to block until the slave
737 * is open, and there's something to read;
738 * but if we lost the slave or we're NBIO,
739 * then return the appropriate error instead.
740 */
741 for (;;) {
742 if (tp->t_state&TS_ISOPEN) {
f5f1bbd4 743 if ((pti->pt_flags & PF_PKT) && pti->pt_send) {
fef8985e 744 error = ureadc((int)pti->pt_send, ap->a_uio);
22ff886e
AH
745 if (error) {
746 lwkt_reltoken(&tty_token);
984263bc 747 return (error);
22ff886e 748 }
984263bc 749 if (pti->pt_send & TIOCPKT_IOCTL) {
e54488bb
MD
750 cc = (int)szmin(ap->a_uio->uio_resid,
751 sizeof(tp->t_termios));
984263bc 752 uiomove((caddr_t)&tp->t_termios, cc,
fef8985e 753 ap->a_uio);
984263bc
MD
754 }
755 pti->pt_send = 0;
22ff886e 756 lwkt_reltoken(&tty_token);
984263bc
MD
757 return (0);
758 }
f5f1bbd4 759 if ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl) {
fef8985e 760 error = ureadc((int)pti->pt_ucntl, ap->a_uio);
22ff886e
AH
761 if (error) {
762 lwkt_reltoken(&tty_token);
984263bc 763 return (error);
22ff886e 764 }
984263bc 765 pti->pt_ucntl = 0;
22ff886e 766 lwkt_reltoken(&tty_token);
984263bc
MD
767 return (0);
768 }
769 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
770 break;
771 }
22ff886e
AH
772 if ((tp->t_state & TS_CONNECTED) == 0) {
773 lwkt_reltoken(&tty_token);
984263bc 774 return (0); /* EOF */
22ff886e
AH
775 }
776 if (ap->a_ioflag & IO_NDELAY) {
777 lwkt_reltoken(&tty_token);
984263bc 778 return (EWOULDBLOCK);
22ff886e 779 }
377d4740 780 error = tsleep(TSA_PTC_READ(tp), PCATCH, "ptcin", 0);
22ff886e
AH
781 if (error) {
782 lwkt_reltoken(&tty_token);
984263bc 783 return (error);
22ff886e 784 }
984263bc
MD
785 }
786 if (pti->pt_flags & (PF_PKT|PF_UCNTL))
fef8985e
MD
787 error = ureadc(0, ap->a_uio);
788 while (ap->a_uio->uio_resid > 0 && error == 0) {
e54488bb
MD
789 cc = q_to_b(&tp->t_outq, buf,
790 (int)szmin(ap->a_uio->uio_resid, BUFSIZ));
984263bc
MD
791 if (cc <= 0)
792 break;
e54488bb 793 error = uiomove(buf, (size_t)cc, ap->a_uio);
984263bc
MD
794 }
795 ttwwakeup(tp);
22ff886e 796 lwkt_reltoken(&tty_token);
984263bc
MD
797 return (error);
798}
799
800static void
c972a82f 801ptsstop(struct tty *tp, int flush)
984263bc
MD
802{
803 struct pt_ioctl *pti = tp->t_dev->si_drv1;
804 int flag;
805
22ff886e 806 lwkt_gettoken(&tty_token);
984263bc 807 /* note: FLUSHREAD and FLUSHWRITE already ok */
1c375cd1
MD
808 if (pti) {
809 if (flush == 0) {
810 flush = TIOCPKT_STOP;
811 pti->pt_flags |= PF_STOPPED;
812 } else {
813 pti->pt_flags &= ~PF_STOPPED;
814 }
815 pti->pt_send |= flush;
816 /* change of perspective */
817 }
984263bc
MD
818 flag = 0;
819 if (flush & FREAD)
820 flag |= FWRITE;
821 if (flush & FWRITE)
822 flag |= FREAD;
823 ptcwakeup(tp, flag);
22ff886e
AH
824
825 lwkt_reltoken(&tty_token);
984263bc
MD
826}
827
f5f1bbd4
MD
828/*
829 * ttyunhold() calls us instead of just decrementing tp->t_refs. This
830 * is needed because a session can hold onto a pts (half closed state)
831 * even if there are no live file descriptors. Without the callback
832 * we can't clean up.
833 */
834static void
835ptsunhold(struct tty *tp)
836{
837 struct pt_ioctl *pti = tp->t_dev->si_drv1;
838
839 lwkt_gettoken(&tty_token);
840 pti_hold(pti);
841 --tp->t_refs;
842 pti_done(pti);
843 lwkt_reltoken(&tty_token);
844}
845
8acdf1cf
MD
846/*
847 * kqueue ops for pseudo-terminals.
848 */
849static struct filterops ptcread_filtops =
a081e067 850 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_ptcrdetach, filt_ptcread };
8acdf1cf 851static struct filterops ptcwrite_filtops =
a081e067 852 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_ptcwdetach, filt_ptcwrite };
8acdf1cf
MD
853
854static int
855ptckqfilter(struct dev_kqfilter_args *ap)
856{
857 cdev_t dev = ap->a_head.a_dev;
858 struct knote *kn = ap->a_kn;
859 struct tty *tp = dev->si_tty;
860 struct klist *klist;
861
22ff886e 862 lwkt_gettoken(&tty_token);
8acdf1cf
MD
863 ap->a_result = 0;
864 switch (kn->kn_filter) {
865 case EVFILT_READ:
5b22f1a7 866 klist = &tp->t_rkq.ki_note;
8acdf1cf
MD
867 kn->kn_fop = &ptcread_filtops;
868 break;
869 case EVFILT_WRITE:
5b22f1a7 870 klist = &tp->t_wkq.ki_note;
8acdf1cf
MD
871 kn->kn_fop = &ptcwrite_filtops;
872 break;
873 default:
b287d649 874 ap->a_result = EOPNOTSUPP;
22ff886e 875 lwkt_reltoken(&tty_token);
8acdf1cf
MD
876 return (0);
877 }
878
879 kn->kn_hook = (caddr_t)dev;
5b22f1a7 880 knote_insert(klist, kn);
22ff886e 881 lwkt_reltoken(&tty_token);
8acdf1cf
MD
882 return (0);
883}
884
885static int
886filt_ptcread (struct knote *kn, long hint)
887{
888 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
889 struct pt_ioctl *pti = ((cdev_t)kn->kn_hook)->si_drv1;
890
22ff886e 891 lwkt_gettoken(&tty_token);
f5f1bbd4 892 if ((tp->t_state & TS_ZOMBIE) || (pti->pt_flags & PF_SCLOSED)) {
3bcb6e5e 893 kn->kn_flags |= (EV_EOF | EV_NODATA);
22ff886e 894 lwkt_reltoken(&tty_token);
847ff8ce
SG
895 return (1);
896 }
897
8acdf1cf
MD
898 if ((tp->t_state & TS_ISOPEN) &&
899 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
900 ((pti->pt_flags & PF_PKT) && pti->pt_send) ||
901 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) {
902 kn->kn_data = tp->t_outq.c_cc;
22ff886e 903 lwkt_reltoken(&tty_token);
8acdf1cf
MD
904 return(1);
905 } else {
22ff886e 906 lwkt_reltoken(&tty_token);
8acdf1cf
MD
907 return(0);
908 }
909}
910
911static int
912filt_ptcwrite (struct knote *kn, long hint)
913{
914 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
915 struct pt_ioctl *pti = ((cdev_t)kn->kn_hook)->si_drv1;
916
22ff886e 917 lwkt_gettoken(&tty_token);
847ff8ce 918 if (tp->t_state & TS_ZOMBIE) {
3bcb6e5e 919 kn->kn_flags |= (EV_EOF | EV_NODATA);
22ff886e 920 lwkt_reltoken(&tty_token);
847ff8ce
SG
921 return (1);
922 }
923
8acdf1cf
MD
924 if (tp->t_state & TS_ISOPEN &&
925 ((pti->pt_flags & PF_REMOTE) ?
926 (tp->t_canq.c_cc == 0) :
927 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
928 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) {
929 kn->kn_data = tp->t_canq.c_cc + tp->t_rawq.c_cc;
22ff886e 930 lwkt_reltoken(&tty_token);
8acdf1cf
MD
931 return(1);
932 } else {
22ff886e 933 lwkt_reltoken(&tty_token);
8acdf1cf
MD
934 return(0);
935 }
22ff886e 936 /* NOTREACHED */
8acdf1cf
MD
937}
938
939static void
940filt_ptcrdetach (struct knote *kn)
941{
942 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
943
5b22f1a7 944 knote_remove(&tp->t_rkq.ki_note, kn);
8acdf1cf
MD
945}
946
947static void
948filt_ptcwdetach (struct knote *kn)
949{
950 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
951
5b22f1a7 952 knote_remove(&tp->t_wkq.ki_note, kn);
8acdf1cf
MD
953}
954
955/*
956 * I/O ops
957 */
984263bc 958static int
fef8985e 959ptcwrite(struct dev_write_args *ap)
984263bc 960{
b13267a5 961 cdev_t dev = ap->a_head.a_dev;
1fd87d54
RG
962 struct tty *tp = dev->si_tty;
963 u_char *cp = 0;
964 int cc = 0;
984263bc
MD
965 u_char locbuf[BUFSIZ];
966 int cnt = 0;
967 struct pt_ioctl *pti = dev->si_drv1;
968 int error = 0;
969
22ff886e 970 lwkt_gettoken(&tty_token);
984263bc
MD
971again:
972 if ((tp->t_state&TS_ISOPEN) == 0)
973 goto block;
974 if (pti->pt_flags & PF_REMOTE) {
975 if (tp->t_canq.c_cc)
976 goto block;
fef8985e 977 while ((ap->a_uio->uio_resid > 0 || cc > 0) &&
984263bc
MD
978 tp->t_canq.c_cc < TTYHOG - 1) {
979 if (cc == 0) {
e54488bb
MD
980 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
981 cc = imin(cc, TTYHOG - 1 - tp->t_canq.c_cc);
984263bc 982 cp = locbuf;
e54488bb 983 error = uiomove(cp, (size_t)cc, ap->a_uio);
22ff886e
AH
984 if (error) {
985 lwkt_reltoken(&tty_token);
984263bc 986 return (error);
22ff886e 987 }
984263bc
MD
988 /* check again for safety */
989 if ((tp->t_state & TS_ISOPEN) == 0) {
990 /* adjust as usual */
fef8985e 991 ap->a_uio->uio_resid += cc;
22ff886e 992 lwkt_reltoken(&tty_token);
984263bc
MD
993 return (EIO);
994 }
995 }
996 if (cc > 0) {
997 cc = b_to_q((char *)cp, cc, &tp->t_canq);
998 /*
999 * XXX we don't guarantee that the canq size
1000 * is >= TTYHOG, so the above b_to_q() may
1001 * leave some bytes uncopied. However, space
1002 * is guaranteed for the null terminator if
1003 * we don't fail here since (TTYHOG - 1) is
1004 * not a multiple of CBSIZE.
1005 */
1006 if (cc > 0)
1007 break;
1008 }
1009 }
1010 /* adjust for data copied in but not written */
fef8985e 1011 ap->a_uio->uio_resid += cc;
0ced1954 1012 clist_putc(0, &tp->t_canq);
984263bc
MD
1013 ttwakeup(tp);
1014 wakeup(TSA_PTS_READ(tp));
22ff886e 1015 lwkt_reltoken(&tty_token);
984263bc
MD
1016 return (0);
1017 }
fef8985e 1018 while (ap->a_uio->uio_resid > 0 || cc > 0) {
984263bc 1019 if (cc == 0) {
e54488bb 1020 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
984263bc 1021 cp = locbuf;
e54488bb 1022 error = uiomove(cp, (size_t)cc, ap->a_uio);
22ff886e
AH
1023 if (error) {
1024 lwkt_reltoken(&tty_token);
984263bc 1025 return (error);
22ff886e 1026 }
984263bc
MD
1027 /* check again for safety */
1028 if ((tp->t_state & TS_ISOPEN) == 0) {
1029 /* adjust for data copied in but not written */
fef8985e 1030 ap->a_uio->uio_resid += cc;
22ff886e 1031 lwkt_reltoken(&tty_token);
984263bc
MD
1032 return (EIO);
1033 }
1034 }
1035 while (cc > 0) {
1036 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
1037 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
1038 wakeup(TSA_HUP_OR_INPUT(tp));
1039 goto block;
1040 }
1041 (*linesw[tp->t_line].l_rint)(*cp++, tp);
1042 cnt++;
1043 cc--;
1044 }
1045 cc = 0;
1046 }
22ff886e 1047 lwkt_reltoken(&tty_token);
984263bc
MD
1048 return (0);
1049block:
1050 /*
1051 * Come here to wait for slave to open, for space
1052 * in outq, or space in rawq, or an empty canq.
1053 */
1054 if ((tp->t_state & TS_CONNECTED) == 0) {
1055 /* adjust for data copied in but not written */
fef8985e 1056 ap->a_uio->uio_resid += cc;
22ff886e 1057 lwkt_reltoken(&tty_token);
984263bc
MD
1058 return (EIO);
1059 }
fef8985e 1060 if (ap->a_ioflag & IO_NDELAY) {
984263bc 1061 /* adjust for data copied in but not written */
fef8985e 1062 ap->a_uio->uio_resid += cc;
22ff886e
AH
1063 if (cnt == 0) {
1064 lwkt_reltoken(&tty_token);
984263bc 1065 return (EWOULDBLOCK);
22ff886e
AH
1066 }
1067 lwkt_reltoken(&tty_token);
984263bc
MD
1068 return (0);
1069 }
377d4740 1070 error = tsleep(TSA_PTC_WRITE(tp), PCATCH, "ptcout", 0);
984263bc
MD
1071 if (error) {
1072 /* adjust for data copied in but not written */
fef8985e 1073 ap->a_uio->uio_resid += cc;
22ff886e 1074 lwkt_reltoken(&tty_token);
984263bc
MD
1075 return (error);
1076 }
1077 goto again;
1078}
1079
1080/*ARGSUSED*/
1081static int
fef8985e 1082ptyioctl(struct dev_ioctl_args *ap)
984263bc 1083{
b13267a5 1084 cdev_t dev = ap->a_head.a_dev;
1fd87d54
RG
1085 struct tty *tp = dev->si_tty;
1086 struct pt_ioctl *pti = dev->si_drv1;
1087 u_char *cc = tp->t_cc;
984263bc
MD
1088 int stop, error;
1089
22ff886e 1090 lwkt_gettoken(&tty_token);
335dda38 1091 if (dev_dflags(dev) & D_MASTER) {
fef8985e 1092 switch (ap->a_cmd) {
984263bc
MD
1093
1094 case TIOCGPGRP:
1095 /*
1096 * We avoid calling ttioctl on the controller since,
1097 * in that case, tp must be the controlling terminal.
1098 */
fef8985e 1099 *(int *)ap->a_data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
22ff886e 1100 lwkt_reltoken(&tty_token);
984263bc
MD
1101 return (0);
1102
1103 case TIOCPKT:
fef8985e 1104 if (*(int *)ap->a_data) {
22ff886e
AH
1105 if (pti->pt_flags & PF_UCNTL) {
1106 lwkt_reltoken(&tty_token);
984263bc 1107 return (EINVAL);
22ff886e 1108 }
984263bc 1109 pti->pt_flags |= PF_PKT;
f5f1bbd4 1110 } else {
984263bc 1111 pti->pt_flags &= ~PF_PKT;
f5f1bbd4 1112 }
22ff886e 1113 lwkt_reltoken(&tty_token);
984263bc
MD
1114 return (0);
1115
1116 case TIOCUCNTL:
fef8985e 1117 if (*(int *)ap->a_data) {
22ff886e
AH
1118 if (pti->pt_flags & PF_PKT) {
1119 lwkt_reltoken(&tty_token);
984263bc 1120 return (EINVAL);
22ff886e 1121 }
984263bc 1122 pti->pt_flags |= PF_UCNTL;
f5f1bbd4 1123 } else {
984263bc 1124 pti->pt_flags &= ~PF_UCNTL;
f5f1bbd4 1125 }
22ff886e 1126 lwkt_reltoken(&tty_token);
984263bc
MD
1127 return (0);
1128
1129 case TIOCREMOTE:
fef8985e 1130 if (*(int *)ap->a_data)
984263bc
MD
1131 pti->pt_flags |= PF_REMOTE;
1132 else
1133 pti->pt_flags &= ~PF_REMOTE;
1134 ttyflush(tp, FREAD|FWRITE);
22ff886e 1135 lwkt_reltoken(&tty_token);
984263bc 1136 return (0);
c578a286 1137
22ff886e 1138#ifdef UNIX98_PTYS
c578a286 1139 case TIOCISPTMASTER:
f5f1bbd4 1140 if ((pti->pt_flags & PF_UNIX98) &&
470b5de8 1141 (pti->devc == dev)) {
22ff886e 1142 lwkt_reltoken(&tty_token);
c578a286 1143 return (0);
22ff886e
AH
1144 } else {
1145 lwkt_reltoken(&tty_token);
c578a286 1146 return (EINVAL);
22ff886e 1147 }
984263bc 1148 }
22ff886e 1149#endif
984263bc
MD
1150
1151 /*
1152 * The rest of the ioctls shouldn't be called until
1153 * the slave is open.
1154 */
22ff886e
AH
1155 if ((tp->t_state & TS_ISOPEN) == 0) {
1156 lwkt_reltoken(&tty_token);
984263bc 1157 return (EAGAIN);
22ff886e 1158 }
984263bc 1159
fef8985e 1160 switch (ap->a_cmd) {
984263bc
MD
1161#ifdef COMPAT_43
1162 case TIOCSETP:
1163 case TIOCSETN:
1164#endif
1165 case TIOCSETD:
1166 case TIOCSETA:
1167 case TIOCSETAW:
1168 case TIOCSETAF:
1169 /*
1170 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
1171 * ttywflush(tp) will hang if there are characters in
1172 * the outq.
1173 */
1174 ndflush(&tp->t_outq, tp->t_outq.c_cc);
1175 break;
1176
1177 case TIOCSIG:
fef8985e 1178 if (*(unsigned int *)ap->a_data >= NSIG ||
22ff886e
AH
1179 *(unsigned int *)ap->a_data == 0) {
1180 lwkt_reltoken(&tty_token);
984263bc 1181 return(EINVAL);
22ff886e 1182 }
984263bc
MD
1183 if ((tp->t_lflag&NOFLSH) == 0)
1184 ttyflush(tp, FREAD|FWRITE);
fef8985e
MD
1185 pgsignal(tp->t_pgrp, *(unsigned int *)ap->a_data, 1);
1186 if ((*(unsigned int *)ap->a_data == SIGINFO) &&
984263bc
MD
1187 ((tp->t_lflag&NOKERNINFO) == 0))
1188 ttyinfo(tp);
22ff886e 1189 lwkt_reltoken(&tty_token);
984263bc
MD
1190 return(0);
1191 }
1192 }
fef8985e 1193 if (ap->a_cmd == TIOCEXT) {
984263bc
MD
1194 /*
1195 * When the EXTPROC bit is being toggled, we need
1196 * to send an TIOCPKT_IOCTL if the packet driver
1197 * is turned on.
1198 */
fef8985e 1199 if (*(int *)ap->a_data) {
984263bc
MD
1200 if (pti->pt_flags & PF_PKT) {
1201 pti->pt_send |= TIOCPKT_IOCTL;
1202 ptcwakeup(tp, FREAD);
1203 }
1204 tp->t_lflag |= EXTPROC;
1205 } else {
1206 if ((tp->t_lflag & EXTPROC) &&
1207 (pti->pt_flags & PF_PKT)) {
1208 pti->pt_send |= TIOCPKT_IOCTL;
1209 ptcwakeup(tp, FREAD);
1210 }
1211 tp->t_lflag &= ~EXTPROC;
1212 }
22ff886e 1213 lwkt_reltoken(&tty_token);
984263bc
MD
1214 return(0);
1215 }
fef8985e
MD
1216 error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
1217 ap->a_fflag, ap->a_cred);
984263bc 1218 if (error == ENOIOCTL)
fef8985e 1219 error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
984263bc
MD
1220 if (error == ENOIOCTL) {
1221 if (pti->pt_flags & PF_UCNTL &&
fef8985e
MD
1222 (ap->a_cmd & ~0xff) == UIOCCMD(0)) {
1223 if (ap->a_cmd & 0xff) {
1224 pti->pt_ucntl = (u_char)ap->a_cmd;
984263bc
MD
1225 ptcwakeup(tp, FREAD);
1226 }
22ff886e 1227 lwkt_reltoken(&tty_token);
984263bc
MD
1228 return (0);
1229 }
1230 error = ENOTTY;
1231 }
1232 /*
1233 * If external processing and packet mode send ioctl packet.
1234 */
1235 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
fef8985e 1236 switch(ap->a_cmd) {
984263bc
MD
1237 case TIOCSETA:
1238 case TIOCSETAW:
1239 case TIOCSETAF:
1240#ifdef COMPAT_43
1241 case TIOCSETP:
1242 case TIOCSETN:
1243#endif
1244#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1245 case TIOCSETC:
1246 case TIOCSLTC:
1247 case TIOCLBIS:
1248 case TIOCLBIC:
1249 case TIOCLSET:
1250#endif
1251 pti->pt_send |= TIOCPKT_IOCTL;
1252 ptcwakeup(tp, FREAD);
1253 default:
1254 break;
1255 }
1256 }
1257 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
1258 && CCEQ(cc[VSTART], CTRL('q'));
1259 if (pti->pt_flags & PF_NOSTOP) {
1260 if (stop) {
1261 pti->pt_send &= ~TIOCPKT_NOSTOP;
1262 pti->pt_send |= TIOCPKT_DOSTOP;
1263 pti->pt_flags &= ~PF_NOSTOP;
1264 ptcwakeup(tp, FREAD);
1265 }
1266 } else {
1267 if (!stop) {
1268 pti->pt_send &= ~TIOCPKT_DOSTOP;
1269 pti->pt_send |= TIOCPKT_NOSTOP;
1270 pti->pt_flags |= PF_NOSTOP;
1271 ptcwakeup(tp, FREAD);
1272 }
1273 }
22ff886e 1274 lwkt_reltoken(&tty_token);
984263bc
MD
1275 return (error);
1276}
1277
1278
402ed7e1 1279static void ptc_drvinit (void *unused);
984263bc 1280
c578a286
AH
1281#ifdef UNIX98_PTYS
1282SYSCTL_INT(_kern, OID_AUTO, pty_debug, CTLFLAG_RW, &pty_debug_level,
1283 0, "Change pty debug level");
1284#endif
1285
984263bc 1286static void
c972a82f 1287ptc_drvinit(void *unused)
984263bc 1288{
cd29885a 1289 int i;
cd29885a 1290
c578a286
AH
1291#ifdef UNIX98_PTYS
1292 /*
1293 * Unix98 pty stuff.
1294 * Create the clonable base device.
1295 */
1296 make_autoclone_dev(&ptc_ops, &DEVFS_CLONE_BITMAP(pty), ptyclone,
1297 0, 0, 0666, "ptmx");
cd29885a 1298#endif
c578a286 1299
cd29885a
MD
1300 for (i = 0; i < 256; i++) {
1301 ptyinit(i);
1302 }
984263bc
MD
1303}
1304
1305SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)