Fix a minor compile-time errors when INVARIANTS is not defined.
[dragonfly.git] / sys / dev / misc / nmdm / nmdm.c
CommitLineData
984263bc
MD
1/*
2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * $FreeBSD: src/sys/dev/nmdm/nmdm.c,v 1.5.2.1 2001/08/11 00:54:14 mp Exp $
377d4740 34 * $DragonFly: src/sys/dev/misc/nmdm/nmdm.c,v 1.5 2003/07/19 21:14:25 dillon Exp $
984263bc
MD
35 */
36
37/*
38 * Pseudo-nulmodem Driver
39 */
40#include "opt_compat.h"
41#include <sys/param.h>
42#include <sys/systm.h>
43#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
44#include <sys/ioctl_compat.h>
45#endif
46#include <sys/proc.h>
47#include <sys/tty.h>
48#include <sys/conf.h>
49#include <sys/fcntl.h>
50#include <sys/poll.h>
51#include <sys/kernel.h>
52#include <sys/vnode.h>
53#include <sys/signalvar.h>
54#include <sys/malloc.h>
55
56MALLOC_DEFINE(M_NLMDM, "nullmodem", "nullmodem data structures");
57
58static void nmdmstart __P((struct tty *tp));
59static void nmdmstop __P((struct tty *tp, int rw));
60static void wakeup_other __P((struct tty *tp, int flag));
61static void nmdminit __P((int n));
62
63static d_open_t nmdmopen;
64static d_close_t nmdmclose;
65static d_read_t nmdmread;
66static d_write_t nmdmwrite;
67static d_ioctl_t nmdmioctl;
68
69#define CDEV_MAJOR 18
70static struct cdevsw nmdm_cdevsw = {
71 /* open */ nmdmopen,
72 /* close */ nmdmclose,
73 /* read */ nmdmread,
74 /* write */ nmdmwrite,
75 /* ioctl */ nmdmioctl,
76 /* poll */ ttypoll,
77 /* mmap */ nommap,
78 /* strategy */ nostrategy,
79 /* name */ "pts",
80 /* maj */ CDEV_MAJOR,
81 /* dump */ nodump,
82 /* psize */ nopsize,
83 /* flags */ D_TTY,
84 /* bmaj */ -1
85};
86
87#define BUFSIZ 100 /* Chunk size iomoved to/from user */
88
89struct softpart {
90 struct tty nm_tty;
91 dev_t dev;
92 int modemsignals; /* bits defined in sys/ttycom.h */
93 int gotbreak;
94};
95
96struct nm_softc {
97 int pt_flags;
98 struct softpart part1, part2;
99 struct prison *pt_prison;
100};
101
102#define PF_STOPPED 0x10 /* user told stopped */
103
104static void
105nmdm_crossover(struct nm_softc *pti,
106 struct softpart *ourpart,
107 struct softpart *otherpart);
108
109#define GETPARTS(tp, ourpart, otherpart) \
110do { \
111 struct nm_softc *pti = tp->t_dev->si_drv1; \
112 if (tp == &pti->part1.nm_tty) { \
113 ourpart = &pti->part1; \
114 otherpart = &pti->part2; \
115 } else { \
116 ourpart = &pti->part2; \
117 otherpart = &pti->part1; \
118 } \
119} while (0)
120
121/*
122 * This function creates and initializes a pair of ttys.
123 */
124static void
125nmdminit(n)
126 int n;
127{
128 dev_t dev1, dev2;
129 struct nm_softc *pt;
130
131 /* For now we only map the lower 8 bits of the minor */
132 if (n & ~0xff)
133 return;
134
135 pt = malloc(sizeof(*pt), M_NLMDM, M_WAITOK);
136 bzero(pt, sizeof(*pt));
137 pt->part1.dev = dev1 = make_dev(&nmdm_cdevsw, n+n,
138 0, 0, 0666, "nmdm%dA", n);
139 pt->part2.dev = dev2 = make_dev(&nmdm_cdevsw, n+n+1,
140 0, 0, 0666, "nmdm%dB", n);
141
142 dev1->si_drv1 = dev2->si_drv1 = pt;
143 dev1->si_tty = &pt->part1.nm_tty;
144 dev2->si_tty = &pt->part2.nm_tty;
145 ttyregister(&pt->part1.nm_tty);
146 ttyregister(&pt->part2.nm_tty);
147 pt->part1.nm_tty.t_oproc = nmdmstart;
148 pt->part2.nm_tty.t_oproc = nmdmstart;
149 pt->part1.nm_tty.t_stop = nmdmstop;
150 pt->part2.nm_tty.t_dev = dev1;
151 pt->part1.nm_tty.t_dev = dev2;
152 pt->part2.nm_tty.t_stop = nmdmstop;
153}
154
155/*ARGSUSED*/
156static int
41c20dac 157nmdmopen(dev_t dev, int flag, int devtype, struct thread *td)
984263bc 158{
41c20dac
MD
159 struct proc *p = td->td_proc;
160 struct tty *tp, *tp2;
984263bc
MD
161 int error;
162 int minr;
163 dev_t nextdev;
164 struct nm_softc *pti;
165 int is_b;
166 int pair;
167 struct softpart *ourpart, *otherpart;
168
41c20dac
MD
169 KKASSERT(p != NULL);
170
984263bc
MD
171 /*
172 * XXX: Gross hack for DEVFS:
173 * If we openned this device, ensure we have the
174 * next one too, so people can open it.
175 */
176 minr = lminor(dev);
177 pair = minr >> 1;
178 is_b = minr & 1;
179
180 if (pair < 127) {
181 nextdev = makedev(major(dev), (pair+pair) + 1);
182 if (!nextdev->si_drv1) {
183 nmdminit(pair + 1);
184 }
185 }
186 if (!dev->si_drv1)
187 nmdminit(pair);
188
189 if (!dev->si_drv1)
190 return(ENXIO);
191
192 pti = dev->si_drv1;
193 if (is_b)
194 tp = &pti->part2.nm_tty;
195 else
196 tp = &pti->part1.nm_tty;
197 GETPARTS(tp, ourpart, otherpart);
198 tp2 = &otherpart->nm_tty;
199 ourpart->modemsignals |= TIOCM_LE;
200
201 if ((tp->t_state & TS_ISOPEN) == 0) {
202 ttychars(tp); /* Set up default chars */
203 tp->t_iflag = TTYDEF_IFLAG;
204 tp->t_oflag = TTYDEF_OFLAG;
205 tp->t_lflag = TTYDEF_LFLAG;
206 tp->t_cflag = TTYDEF_CFLAG;
207 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
dadab5e9 208 } else if (tp->t_state & TS_XCLUDE && suser(td)) {
984263bc 209 return (EBUSY);
41c20dac 210 } else if (pti->pt_prison != p->p_ucred->cr_prison) {
984263bc
MD
211 return (EBUSY);
212 }
213
214 /*
215 * If the other side is open we have carrier
216 */
217 if (tp2->t_state & TS_ISOPEN) {
218 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
219 }
220
221 /*
222 * And the other side gets carrier as we are now open.
223 */
224 (void)(*linesw[tp2->t_line].l_modem)(tp2, 1);
225
226 /* External processing makes no sense here */
227 tp->t_lflag &= ~EXTPROC;
228
229 /*
230 * Wait here if we don't have carrier.
231 */
232#if 0
233 while ((tp->t_state & TS_CARR_ON) == 0) {
234 if (flag & FNONBLOCK)
235 break;
377d4740 236 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "nmdopn", 0);
984263bc
MD
237 if (error)
238 return (error);
239 }
240#endif
241
242 /*
243 * Give the line disciplin a chance to set this end up.
244 */
245 error = (*linesw[tp->t_line].l_open)(dev, tp);
246
247 /*
248 * Wake up the other side.
249 * Theoretically not needed.
250 */
251 ourpart->modemsignals |= TIOCM_DTR;
252 nmdm_crossover(pti, ourpart, otherpart);
253 if (error == 0)
254 wakeup_other(tp, FREAD|FWRITE); /* XXX */
255 return (error);
256}
257
258static int
41c20dac 259nmdmclose(dev_t dev, int flag, int mode, struct thread *td)
984263bc
MD
260{
261 register struct tty *tp, *tp2;
262 int err;
263 struct softpart *ourpart, *otherpart;
264
265 /*
266 * let the other end know that the game is up
267 */
268 tp = dev->si_tty;
269 GETPARTS(tp, ourpart, otherpart);
270 tp2 = &otherpart->nm_tty;
271 (void)(*linesw[tp2->t_line].l_modem)(tp2, 0);
272
273 /*
274 * XXX MDMBUF makes no sense for nmdms but would inhibit the above
275 * l_modem(). CLOCAL makes sense but isn't supported. Special
276 * l_modem()s that ignore carrier drop make no sense for nmdms but
277 * may be in use because other parts of the line discipline make
278 * sense for nmdms. Recover by doing everything that a normal
279 * ttymodem() would have done except for sending a SIGHUP.
280 */
281 if (tp2->t_state & TS_ISOPEN) {
282 tp2->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
283 tp2->t_state |= TS_ZOMBIE;
284 ttyflush(tp2, FREAD | FWRITE);
285 }
286
287 err = (*linesw[tp->t_line].l_close)(tp, flag);
288 ourpart->modemsignals &= ~TIOCM_DTR;
289 nmdm_crossover(dev->si_drv1, ourpart, otherpart);
290 nmdmstop(tp, FREAD|FWRITE);
291 (void) ttyclose(tp);
292 return (err);
293}
294
295static int
296nmdmread(dev, uio, flag)
297 dev_t dev;
298 struct uio *uio;
299 int flag;
300{
301 int error = 0;
302 struct tty *tp, *tp2;
303 struct softpart *ourpart, *otherpart;
304
305 tp = dev->si_tty;
306 GETPARTS(tp, ourpart, otherpart);
307 tp2 = &otherpart->nm_tty;
308
309#if 0
310 if (tp2->t_state & TS_ISOPEN) {
311 error = (*linesw[tp->t_line].l_read)(tp, uio, flag);
312 wakeup_other(tp, FWRITE);
313 } else {
314 if (flag & IO_NDELAY) {
315 return (EWOULDBLOCK);
316 }
377d4740 317 error = tsleep(TSA_PTC_READ(tp), PCATCH, "nmdout", 0);
984263bc
MD
318 }
319 }
320#else
321 if ((error = (*linesw[tp->t_line].l_read)(tp, uio, flag)) == 0)
322 wakeup_other(tp, FWRITE);
323#endif
324 return (error);
325}
326
327/*
328 * Write to pseudo-tty.
329 * Wakeups of controlling tty will happen
330 * indirectly, when tty driver calls nmdmstart.
331 */
332static int
333nmdmwrite(dev, uio, flag)
334 dev_t dev;
335 struct uio *uio;
336 int flag;
337{
338 register u_char *cp = 0;
339 register int cc = 0;
340 u_char locbuf[BUFSIZ];
341 int cnt = 0;
342 int error = 0;
343 struct tty *tp1, *tp;
344 struct softpart *ourpart, *otherpart;
345
346 tp1 = dev->si_tty;
347 /*
348 * Get the other tty struct.
349 * basically we are writing into the INPUT side of the other device.
350 */
351 GETPARTS(tp1, ourpart, otherpart);
352 tp = &otherpart->nm_tty;
353
354again:
355 if ((tp->t_state & TS_ISOPEN) == 0)
356 return (EIO);
357 while (uio->uio_resid > 0 || cc > 0) {
358 /*
359 * Fill up the buffer if it's empty
360 */
361 if (cc == 0) {
362 cc = min(uio->uio_resid, BUFSIZ);
363 cp = locbuf;
364 error = uiomove((caddr_t)cp, cc, uio);
365 if (error)
366 return (error);
367 /* check again for safety */
368 if ((tp->t_state & TS_ISOPEN) == 0) {
369 /* adjust for data copied in but not written */
370 uio->uio_resid += cc;
371 return (EIO);
372 }
373 }
374 while (cc > 0) {
375 if (((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= (TTYHOG-2))
376 && ((tp->t_canq.c_cc > 0) || !(tp->t_iflag&ICANON))) {
377 /*
378 * Come here to wait for space in outq,
379 * or space in rawq, or an empty canq.
380 */
381 wakeup(TSA_HUP_OR_INPUT(tp));
382 if ((tp->t_state & TS_CONNECTED) == 0) {
383 /*
384 * Data piled up because not connected.
385 * Adjust for data copied in but
386 * not written.
387 */
388 uio->uio_resid += cc;
389 return (EIO);
390 }
391 if (flag & IO_NDELAY) {
392 /*
393 * Don't wait if asked not to.
394 * Adjust for data copied in but
395 * not written.
396 */
397 uio->uio_resid += cc;
398 if (cnt == 0)
399 return (EWOULDBLOCK);
400 return (0);
401 }
402 error = tsleep(TSA_PTC_WRITE(tp),
377d4740 403 PCATCH, "nmdout", 0);
984263bc
MD
404 if (error) {
405 /*
406 * Tsleep returned (signal?).
407 * Go find out what the user wants.
408 * adjust for data copied in but
409 * not written
410 */
411 uio->uio_resid += cc;
412 return (error);
413 }
414 goto again;
415 }
416 (*linesw[tp->t_line].l_rint)(*cp++, tp);
417 cnt++;
418 cc--;
419 }
420 cc = 0;
421 }
422 return (0);
423}
424
425/*
426 * Start output on pseudo-tty.
427 * Wake up process selecting or sleeping for input from controlling tty.
428 */
429static void
430nmdmstart(tp)
431 struct tty *tp;
432{
433 register struct nm_softc *pti = tp->t_dev->si_drv1;
434
435 if (tp->t_state & TS_TTSTOP)
436 return;
437 pti->pt_flags &= ~PF_STOPPED;
438 wakeup_other(tp, FREAD);
439}
440
441/* Wakes up the OTHER tty;*/
442static void
443wakeup_other(tp, flag)
444 struct tty *tp;
445 int flag;
446{
447 struct softpart *ourpart, *otherpart;
448
449 GETPARTS(tp, ourpart, otherpart);
450 if (flag & FREAD) {
451 selwakeup(&otherpart->nm_tty.t_rsel);
452 wakeup(TSA_PTC_READ((&otherpart->nm_tty)));
453 }
454 if (flag & FWRITE) {
455 selwakeup(&otherpart->nm_tty.t_wsel);
456 wakeup(TSA_PTC_WRITE((&otherpart->nm_tty)));
457 }
458}
459
460static void
461nmdmstop(tp, flush)
462 register struct tty *tp;
463 int flush;
464{
465 struct nm_softc *pti = tp->t_dev->si_drv1;
466 int flag;
467
468 /* note: FLUSHREAD and FLUSHWRITE already ok */
469 if (flush == 0) {
470 flush = TIOCPKT_STOP;
471 pti->pt_flags |= PF_STOPPED;
472 } else
473 pti->pt_flags &= ~PF_STOPPED;
474 /* change of perspective */
475 flag = 0;
476 if (flush & FREAD)
477 flag |= FWRITE;
478 if (flush & FWRITE)
479 flag |= FREAD;
480 wakeup_other(tp, flag);
481}
482
483/*ARGSUSED*/
484static int
41c20dac 485nmdmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td)
984263bc
MD
486{
487 register struct tty *tp = dev->si_tty;
488 struct nm_softc *pti = dev->si_drv1;
489 int error, s;
490 register struct tty *tp2;
491 struct softpart *ourpart, *otherpart;
492
493 s = spltty();
494 GETPARTS(tp, ourpart, otherpart);
495 tp2 = &otherpart->nm_tty;
496
41c20dac 497 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td);
984263bc
MD
498 if (error == ENOIOCTL)
499 error = ttioctl(tp, cmd, data, flag);
500 if (error == ENOIOCTL) {
501 switch (cmd) {
502 case TIOCSBRK:
503 otherpart->gotbreak = 1;
504 break;
505 case TIOCCBRK:
506 break;
507 case TIOCSDTR:
508 ourpart->modemsignals |= TIOCM_DTR;
509 break;
510 case TIOCCDTR:
511 ourpart->modemsignals &= TIOCM_DTR;
512 break;
513 case TIOCMSET:
514 ourpart->modemsignals = *(int *)data;
515 otherpart->modemsignals = *(int *)data;
516 break;
517 case TIOCMBIS:
518 ourpart->modemsignals |= *(int *)data;
519 break;
520 case TIOCMBIC:
521 ourpart->modemsignals &= ~(*(int *)data);
522 otherpart->modemsignals &= ~(*(int *)data);
523 break;
524 case TIOCMGET:
525 *(int *)data = ourpart->modemsignals;
526 break;
527 case TIOCMSDTRWAIT:
528 break;
529 case TIOCMGDTRWAIT:
530 *(int *)data = 0;
531 break;
532 case TIOCTIMESTAMP:
533 case TIOCDCDTIMESTAMP:
534 default:
535 splx(s);
536 error = ENOTTY;
537 return (error);
538 }
539 error = 0;
540 nmdm_crossover(pti, ourpart, otherpart);
541 }
542 splx(s);
543 return (error);
544}
545
546static void
547nmdm_crossover(struct nm_softc *pti,
548 struct softpart *ourpart,
549 struct softpart *otherpart)
550{
551 otherpart->modemsignals &= ~(TIOCM_CTS|TIOCM_CAR);
552 if (ourpart->modemsignals & TIOCM_RTS)
553 otherpart->modemsignals |= TIOCM_CTS;
554 if (ourpart->modemsignals & TIOCM_DTR)
555 otherpart->modemsignals |= TIOCM_CAR;
556}
557
558
559
560static void nmdm_drvinit __P((void *unused));
561
562static void
563nmdm_drvinit(unused)
564 void *unused;
565{
566 cdevsw_add(&nmdm_cdevsw);
567 /* XXX: Gross hack for DEVFS */
568 nmdminit(0);
569}
570
571SYSINIT(nmdmdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,nmdm_drvinit,NULL)