proc->thread stage 4: rework the VFS and DEVICE subsystems to take thread
[dragonfly.git] / sys / dev / misc / nmdm / nmdm.c
CommitLineData
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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 $
dadab5e9 34 * $DragonFly: src/sys/dev/misc/nmdm/nmdm.c,v 1.4 2003/06/25 03:55:47 dillon Exp $
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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{
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159 struct proc *p = td->td_proc;
160 struct tty *tp, *tp2;
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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
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169 KKASSERT(p != NULL);
170
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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) {
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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;
236 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
237 "nmdopn", 0);
238 if (error)
239 return (error);
240 }
241#endif
242
243 /*
244 * Give the line disciplin a chance to set this end up.
245 */
246 error = (*linesw[tp->t_line].l_open)(dev, tp);
247
248 /*
249 * Wake up the other side.
250 * Theoretically not needed.
251 */
252 ourpart->modemsignals |= TIOCM_DTR;
253 nmdm_crossover(pti, ourpart, otherpart);
254 if (error == 0)
255 wakeup_other(tp, FREAD|FWRITE); /* XXX */
256 return (error);
257}
258
259static int
41c20dac 260nmdmclose(dev_t dev, int flag, int mode, struct thread *td)
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261{
262 register struct tty *tp, *tp2;
263 int err;
264 struct softpart *ourpart, *otherpart;
265
266 /*
267 * let the other end know that the game is up
268 */
269 tp = dev->si_tty;
270 GETPARTS(tp, ourpart, otherpart);
271 tp2 = &otherpart->nm_tty;
272 (void)(*linesw[tp2->t_line].l_modem)(tp2, 0);
273
274 /*
275 * XXX MDMBUF makes no sense for nmdms but would inhibit the above
276 * l_modem(). CLOCAL makes sense but isn't supported. Special
277 * l_modem()s that ignore carrier drop make no sense for nmdms but
278 * may be in use because other parts of the line discipline make
279 * sense for nmdms. Recover by doing everything that a normal
280 * ttymodem() would have done except for sending a SIGHUP.
281 */
282 if (tp2->t_state & TS_ISOPEN) {
283 tp2->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
284 tp2->t_state |= TS_ZOMBIE;
285 ttyflush(tp2, FREAD | FWRITE);
286 }
287
288 err = (*linesw[tp->t_line].l_close)(tp, flag);
289 ourpart->modemsignals &= ~TIOCM_DTR;
290 nmdm_crossover(dev->si_drv1, ourpart, otherpart);
291 nmdmstop(tp, FREAD|FWRITE);
292 (void) ttyclose(tp);
293 return (err);
294}
295
296static int
297nmdmread(dev, uio, flag)
298 dev_t dev;
299 struct uio *uio;
300 int flag;
301{
302 int error = 0;
303 struct tty *tp, *tp2;
304 struct softpart *ourpart, *otherpart;
305
306 tp = dev->si_tty;
307 GETPARTS(tp, ourpart, otherpart);
308 tp2 = &otherpart->nm_tty;
309
310#if 0
311 if (tp2->t_state & TS_ISOPEN) {
312 error = (*linesw[tp->t_line].l_read)(tp, uio, flag);
313 wakeup_other(tp, FWRITE);
314 } else {
315 if (flag & IO_NDELAY) {
316 return (EWOULDBLOCK);
317 }
318 error = tsleep(TSA_PTC_READ(tp),
319 TTIPRI | PCATCH, "nmdout", 0);
320 }
321 }
322#else
323 if ((error = (*linesw[tp->t_line].l_read)(tp, uio, flag)) == 0)
324 wakeup_other(tp, FWRITE);
325#endif
326 return (error);
327}
328
329/*
330 * Write to pseudo-tty.
331 * Wakeups of controlling tty will happen
332 * indirectly, when tty driver calls nmdmstart.
333 */
334static int
335nmdmwrite(dev, uio, flag)
336 dev_t dev;
337 struct uio *uio;
338 int flag;
339{
340 register u_char *cp = 0;
341 register int cc = 0;
342 u_char locbuf[BUFSIZ];
343 int cnt = 0;
344 int error = 0;
345 struct tty *tp1, *tp;
346 struct softpart *ourpart, *otherpart;
347
348 tp1 = dev->si_tty;
349 /*
350 * Get the other tty struct.
351 * basically we are writing into the INPUT side of the other device.
352 */
353 GETPARTS(tp1, ourpart, otherpart);
354 tp = &otherpart->nm_tty;
355
356again:
357 if ((tp->t_state & TS_ISOPEN) == 0)
358 return (EIO);
359 while (uio->uio_resid > 0 || cc > 0) {
360 /*
361 * Fill up the buffer if it's empty
362 */
363 if (cc == 0) {
364 cc = min(uio->uio_resid, BUFSIZ);
365 cp = locbuf;
366 error = uiomove((caddr_t)cp, cc, uio);
367 if (error)
368 return (error);
369 /* check again for safety */
370 if ((tp->t_state & TS_ISOPEN) == 0) {
371 /* adjust for data copied in but not written */
372 uio->uio_resid += cc;
373 return (EIO);
374 }
375 }
376 while (cc > 0) {
377 if (((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= (TTYHOG-2))
378 && ((tp->t_canq.c_cc > 0) || !(tp->t_iflag&ICANON))) {
379 /*
380 * Come here to wait for space in outq,
381 * or space in rawq, or an empty canq.
382 */
383 wakeup(TSA_HUP_OR_INPUT(tp));
384 if ((tp->t_state & TS_CONNECTED) == 0) {
385 /*
386 * Data piled up because not connected.
387 * Adjust for data copied in but
388 * not written.
389 */
390 uio->uio_resid += cc;
391 return (EIO);
392 }
393 if (flag & IO_NDELAY) {
394 /*
395 * Don't wait if asked not to.
396 * Adjust for data copied in but
397 * not written.
398 */
399 uio->uio_resid += cc;
400 if (cnt == 0)
401 return (EWOULDBLOCK);
402 return (0);
403 }
404 error = tsleep(TSA_PTC_WRITE(tp),
405 TTOPRI | PCATCH, "nmdout", 0);
406 if (error) {
407 /*
408 * Tsleep returned (signal?).
409 * Go find out what the user wants.
410 * adjust for data copied in but
411 * not written
412 */
413 uio->uio_resid += cc;
414 return (error);
415 }
416 goto again;
417 }
418 (*linesw[tp->t_line].l_rint)(*cp++, tp);
419 cnt++;
420 cc--;
421 }
422 cc = 0;
423 }
424 return (0);
425}
426
427/*
428 * Start output on pseudo-tty.
429 * Wake up process selecting or sleeping for input from controlling tty.
430 */
431static void
432nmdmstart(tp)
433 struct tty *tp;
434{
435 register struct nm_softc *pti = tp->t_dev->si_drv1;
436
437 if (tp->t_state & TS_TTSTOP)
438 return;
439 pti->pt_flags &= ~PF_STOPPED;
440 wakeup_other(tp, FREAD);
441}
442
443/* Wakes up the OTHER tty;*/
444static void
445wakeup_other(tp, flag)
446 struct tty *tp;
447 int flag;
448{
449 struct softpart *ourpart, *otherpart;
450
451 GETPARTS(tp, ourpart, otherpart);
452 if (flag & FREAD) {
453 selwakeup(&otherpart->nm_tty.t_rsel);
454 wakeup(TSA_PTC_READ((&otherpart->nm_tty)));
455 }
456 if (flag & FWRITE) {
457 selwakeup(&otherpart->nm_tty.t_wsel);
458 wakeup(TSA_PTC_WRITE((&otherpart->nm_tty)));
459 }
460}
461
462static void
463nmdmstop(tp, flush)
464 register struct tty *tp;
465 int flush;
466{
467 struct nm_softc *pti = tp->t_dev->si_drv1;
468 int flag;
469
470 /* note: FLUSHREAD and FLUSHWRITE already ok */
471 if (flush == 0) {
472 flush = TIOCPKT_STOP;
473 pti->pt_flags |= PF_STOPPED;
474 } else
475 pti->pt_flags &= ~PF_STOPPED;
476 /* change of perspective */
477 flag = 0;
478 if (flush & FREAD)
479 flag |= FWRITE;
480 if (flush & FWRITE)
481 flag |= FREAD;
482 wakeup_other(tp, flag);
483}
484
485/*ARGSUSED*/
486static int
41c20dac 487nmdmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td)
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488{
489 register struct tty *tp = dev->si_tty;
490 struct nm_softc *pti = dev->si_drv1;
491 int error, s;
492 register struct tty *tp2;
493 struct softpart *ourpart, *otherpart;
494
495 s = spltty();
496 GETPARTS(tp, ourpart, otherpart);
497 tp2 = &otherpart->nm_tty;
498
41c20dac 499 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td);
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500 if (error == ENOIOCTL)
501 error = ttioctl(tp, cmd, data, flag);
502 if (error == ENOIOCTL) {
503 switch (cmd) {
504 case TIOCSBRK:
505 otherpart->gotbreak = 1;
506 break;
507 case TIOCCBRK:
508 break;
509 case TIOCSDTR:
510 ourpart->modemsignals |= TIOCM_DTR;
511 break;
512 case TIOCCDTR:
513 ourpart->modemsignals &= TIOCM_DTR;
514 break;
515 case TIOCMSET:
516 ourpart->modemsignals = *(int *)data;
517 otherpart->modemsignals = *(int *)data;
518 break;
519 case TIOCMBIS:
520 ourpart->modemsignals |= *(int *)data;
521 break;
522 case TIOCMBIC:
523 ourpart->modemsignals &= ~(*(int *)data);
524 otherpart->modemsignals &= ~(*(int *)data);
525 break;
526 case TIOCMGET:
527 *(int *)data = ourpart->modemsignals;
528 break;
529 case TIOCMSDTRWAIT:
530 break;
531 case TIOCMGDTRWAIT:
532 *(int *)data = 0;
533 break;
534 case TIOCTIMESTAMP:
535 case TIOCDCDTIMESTAMP:
536 default:
537 splx(s);
538 error = ENOTTY;
539 return (error);
540 }
541 error = 0;
542 nmdm_crossover(pti, ourpart, otherpart);
543 }
544 splx(s);
545 return (error);
546}
547
548static void
549nmdm_crossover(struct nm_softc *pti,
550 struct softpart *ourpart,
551 struct softpart *otherpart)
552{
553 otherpart->modemsignals &= ~(TIOCM_CTS|TIOCM_CAR);
554 if (ourpart->modemsignals & TIOCM_RTS)
555 otherpart->modemsignals |= TIOCM_CTS;
556 if (ourpart->modemsignals & TIOCM_DTR)
557 otherpart->modemsignals |= TIOCM_CAR;
558}
559
560
561
562static void nmdm_drvinit __P((void *unused));
563
564static void
565nmdm_drvinit(unused)
566 void *unused;
567{
568 cdevsw_add(&nmdm_cdevsw);
569 /* XXX: Gross hack for DEVFS */
570 nmdminit(0);
571}
572
573SYSINIT(nmdmdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,nmdm_drvinit,NULL)