34
35/*
36 * Pseudo-teletype Driver
37 * (Actually two drivers, requiring two entries in 'cdevsw')
38 */
39#include "opt_compat.h"
40#include "opt_tty.h"
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/lock.h>
44#include <sys/mutex.h>
45#include <sys/sx.h>
46#ifndef BURN_BRIDGES
47#if defined(COMPAT_43)
48#include <sys/ioctl_compat.h>
49#endif
50#endif
51#include <sys/proc.h>
52#include <sys/tty.h>
53#include <sys/conf.h>
54#include <sys/fcntl.h>
55#include <sys/poll.h>
56#include <sys/kernel.h>
57#include <sys/uio.h>
58#include <sys/signalvar.h>
59#include <sys/malloc.h>
60
61static MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
62
63static void ptsstart(struct tty *tp);
64static void ptsstop(struct tty *tp, int rw);
65static void ptcwakeup(struct tty *tp, int flag);
66static struct cdev *ptyinit(struct cdev *cdev);
67
68static d_open_t ptsopen;
69static d_close_t ptsclose;
70static d_read_t ptsread;
71static d_write_t ptswrite;
72static d_ioctl_t ptsioctl;
73static d_open_t ptcopen;
74static d_close_t ptcclose;
75static d_read_t ptcread;
76static d_ioctl_t ptcioctl;
77static d_write_t ptcwrite;
78static d_poll_t ptcpoll;
79
80static struct cdevsw pts_cdevsw = {
81 .d_version = D_VERSION,
82 .d_open = ptsopen,
83 .d_close = ptsclose,
84 .d_read = ptsread,
85 .d_write = ptswrite,
86 .d_ioctl = ptsioctl,
87 .d_name = "pts",
88 .d_flags = D_TTY | D_NEEDGIANT,
89};
90
91static struct cdevsw ptc_cdevsw = {
92 .d_version = D_VERSION,
93 .d_open = ptcopen,
94 .d_close = ptcclose,
95 .d_read = ptcread,
96 .d_write = ptcwrite,
97 .d_ioctl = ptcioctl,
98 .d_poll = ptcpoll,
99 .d_name = "ptc",
100 .d_flags = D_TTY | D_NEEDGIANT,
101};
102
103#define BUFSIZ 100 /* Chunk size iomoved to/from user */
104
105struct ptsc {
106 int pt_flags;
107 struct selinfo pt_selr, pt_selw;
108 u_char pt_send;
109 u_char pt_ucntl;
110 struct tty *pt_tty;
111 struct cdev *devs, *devc;
112 struct prison *pt_prison;
113};
114
115#define PF_PKT 0x08 /* packet mode */
116#define PF_STOPPED 0x10 /* user told stopped */
117#define PF_NOSTOP 0x40
118#define PF_UCNTL 0x80 /* user control mode */
119
120#define TSA_PTC_READ(tp) ((void *)&(tp)->t_outq.c_cf)
121#define TSA_PTC_WRITE(tp) ((void *)&(tp)->t_rawq.c_cl)
122#define TSA_PTS_READ(tp) ((void *)&(tp)->t_canq)
123
124static char *names = "pqrsPQRS";
125/*
126 * This function creates and initializes a pts/ptc pair
127 *
128 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
129 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
130 *
131 * XXX: define and add mapping of upper minor bits to allow more
132 * than 256 ptys.
133 */
134static struct cdev *
135ptyinit(struct cdev *devc)
136{
137 struct cdev *devs;
138 struct ptsc *pt;
139 int n;
140
141 n = minor(devc);
142 /* For now we only map the lower 8 bits of the minor */
143 if (n & ~0xff)
144 return (NULL);
145
146 devc->si_flags &= ~SI_CHEAPCLONE;
147
148 pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
149 pt->devs = devs = make_dev(&pts_cdevsw, n,
150 UID_ROOT, GID_WHEEL, 0666, "tty%c%r", names[n / 32], n % 32);
151 pt->devc = devc;
152
153 pt->pt_tty = ttymalloc(pt->pt_tty);
154 pt->pt_tty->t_sc = pt;
155 devs->si_drv1 = devc->si_drv1 = pt;
156 devs->si_tty = devc->si_tty = pt->pt_tty;
157 pt->pt_tty->t_dev = devs;
158 return (devc);
159}
160
161/*ARGSUSED*/
162static int
163ptsopen(struct cdev *dev, int flag, int devtype, struct thread *td)
164{
165 struct tty *tp;
166 int error;
167 struct ptsc *pt;
168
169 if (!dev->si_drv1)
170 return(ENXIO);
171 pt = dev->si_drv1;
172 tp = dev->si_tty;
173 if ((tp->t_state & TS_ISOPEN) == 0) {
174 ttyinitmode(tp, 1, 0);
175 } else if (tp->t_state & TS_XCLUDE && suser(td))
176 return (EBUSY);
177 else if (pt->pt_prison != td->td_ucred->cr_prison)
178 return (EBUSY);
179 if (tp->t_oproc) /* Ctrlr still around. */
180 (void)ttyld_modem(tp, 1);
181 while ((tp->t_state & TS_CARR_ON) == 0) {
182 if (flag&FNONBLOCK)
183 break;
184 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
185 "ptsopn", 0);
186 if (error)
187 return (error);
188 }
189 error = ttyld_open(tp, dev);
190 if (error == 0)
191 ptcwakeup(tp, FREAD|FWRITE);
192 return (error);
193}
194
195static int
196ptsclose(struct cdev *dev, int flag, int mode, struct thread *td)
197{
198 struct tty *tp;
199 int err;
200
201 tp = dev->si_tty;
202 err = ttyld_close(tp, flag);
203 (void) tty_close(tp);
204 return (err);
205}
206
207static int
208ptsread(struct cdev *dev, struct uio *uio, int flag)
209{
210 struct tty *tp = dev->si_tty;
211 int error = 0;
212
213 if (tp->t_oproc)
214 error = ttyld_read(tp, uio, flag);
215 ptcwakeup(tp, FWRITE);
216 return (error);
217}
218
219/*
220 * Write to pseudo-tty.
221 * Wakeups of controlling tty will happen
222 * indirectly, when tty driver calls ptsstart.
223 */
224static int
225ptswrite(struct cdev *dev, struct uio *uio, int flag)
226{
227 struct tty *tp;
228
229 tp = dev->si_tty;
230 if (tp->t_oproc == 0)
231 return (EIO);
232 return (ttyld_write(tp, uio, flag));
233}
234
235/*
236 * Start output on pseudo-tty.
237 * Wake up process selecting or sleeping for input from controlling tty.
238 */
239static void
240ptsstart(struct tty *tp)
241{
242 struct ptsc *pt = tp->t_sc;
243
244 if (tp->t_state & TS_TTSTOP)
245 return;
246 if (pt->pt_flags & PF_STOPPED) {
247 pt->pt_flags &= ~PF_STOPPED;
248 pt->pt_send = TIOCPKT_START;
249 }
250 ptcwakeup(tp, FREAD);
251}
252
253static void
254ptcwakeup(struct tty *tp, int flag)
255{
256 struct ptsc *pt = tp->t_sc;
257
258 if (flag & FREAD) {
259 selwakeuppri(&pt->pt_selr, TTIPRI);
260 wakeup(TSA_PTC_READ(tp));
261 }
262 if (flag & FWRITE) {
263 selwakeuppri(&pt->pt_selw, TTOPRI);
264 wakeup(TSA_PTC_WRITE(tp));
265 }
266}
267
268static int
269ptcopen(struct cdev *dev, int flag, int devtype, struct thread *td)
270{
271 struct tty *tp;
272 struct ptsc *pt;
273
274 if (!dev->si_drv1)
275 ptyinit(dev);
276 if (!dev->si_drv1)
277 return(ENXIO);
278 tp = dev->si_tty;
279 if (tp->t_oproc)
280 return (EIO);
281 tp->t_timeout = -1;
282 tp->t_oproc = ptsstart;
283 tp->t_stop = ptsstop;
284 (void)ttyld_modem(tp, 1);
285 tp->t_lflag &= ~EXTPROC;
286 pt = dev->si_drv1;
287 pt->pt_prison = td->td_ucred->cr_prison;
288 pt->pt_flags = 0;
289 pt->pt_send = 0;
290 pt->pt_ucntl = 0;
291 return (0);
292}
293
294static int
295ptcclose(struct cdev *dev, int flags, int fmt, struct thread *td)
296{
297 struct tty *tp;
298
299 tp = dev->si_tty;
300 (void)ttyld_modem(tp, 0);
301
302 /*
303 * XXX MDMBUF makes no sense for ptys but would inhibit the above
304 * l_modem(). CLOCAL makes sense but isn't supported. Special
305 * l_modem()s that ignore carrier drop make no sense for ptys but
306 * may be in use because other parts of the line discipline make
307 * sense for ptys. Recover by doing everything that a normal
308 * ttymodem() would have done except for sending a SIGHUP.
309 */
310 if (tp->t_state & TS_ISOPEN) {
311 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
312 tp->t_state |= TS_ZOMBIE;
313 ttyflush(tp, FREAD | FWRITE);
314 }
315
316 tp->t_oproc = 0; /* mark closed */
317 return (0);
318}
319
320static int
321ptcread(struct cdev *dev, struct uio *uio, int flag)
322{
323 struct tty *tp = dev->si_tty;
324 struct ptsc *pt = dev->si_drv1;
325 char buf[BUFSIZ];
326 int error = 0, cc;
327
328 /*
329 * We want to block until the slave
330 * is open, and there's something to read;
331 * but if we lost the slave or we're NBIO,
332 * then return the appropriate error instead.
333 */
334 for (;;) {
335 if (tp->t_state&TS_ISOPEN) {
336 if (pt->pt_flags&PF_PKT && pt->pt_send) {
337 error = ureadc((int)pt->pt_send, uio);
338 if (error)
339 return (error);
340 if (pt->pt_send & TIOCPKT_IOCTL) {
341 cc = min(uio->uio_resid,
342 sizeof(tp->t_termios));
343 uiomove(&tp->t_termios, cc, uio);
344 }
345 pt->pt_send = 0;
346 return (0);
347 }
348 if (pt->pt_flags&PF_UCNTL && pt->pt_ucntl) {
349 error = ureadc((int)pt->pt_ucntl, uio);
350 if (error)
351 return (error);
352 pt->pt_ucntl = 0;
353 return (0);
354 }
355 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
356 break;
357 }
358 if ((tp->t_state & TS_CONNECTED) == 0)
359 return (0); /* EOF */
360 if (flag & O_NONBLOCK)
361 return (EWOULDBLOCK);
362 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0);
363 if (error)
364 return (error);
365 }
366 if (pt->pt_flags & (PF_PKT|PF_UCNTL))
367 error = ureadc(0, uio);
368 while (uio->uio_resid > 0 && error == 0) {
369 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ));
370 if (cc <= 0)
371 break;
372 error = uiomove(buf, cc, uio);
373 }
374 ttwwakeup(tp);
375 return (error);
376}
377
378static void
379ptsstop(struct tty *tp, int flush)
380{
381 struct ptsc *pt = tp->t_sc;
382 int flag;
383
384 /* note: FLUSHREAD and FLUSHWRITE already ok */
385 if (flush == 0) {
386 flush = TIOCPKT_STOP;
387 pt->pt_flags |= PF_STOPPED;
388 } else
389 pt->pt_flags &= ~PF_STOPPED;
390 pt->pt_send |= flush;
391 /* change of perspective */
392 flag = 0;
393 if (flush & FREAD)
394 flag |= FWRITE;
395 if (flush & FWRITE)
396 flag |= FREAD;
397 ptcwakeup(tp, flag);
398}
399
400static int
401ptcpoll(struct cdev *dev, int events, struct thread *td)
402{
403 struct tty *tp = dev->si_tty;
404 struct ptsc *pt = dev->si_drv1;
405 int revents = 0;
406 int s;
407
408 if ((tp->t_state & TS_CONNECTED) == 0)
409 return (events &
410 (POLLHUP | POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM));
411
412 /*
413 * Need to block timeouts (ttrstart).
414 */
415 s = spltty();
416
417 if (events & (POLLIN | POLLRDNORM))
418 if ((tp->t_state & TS_ISOPEN) &&
419 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
420 ((pt->pt_flags & PF_PKT) && pt->pt_send) ||
421 ((pt->pt_flags & PF_UCNTL) && pt->pt_ucntl)))
422 revents |= events & (POLLIN | POLLRDNORM);
423
424 if (events & (POLLOUT | POLLWRNORM))
425 if (tp->t_state & TS_ISOPEN &&
426 (((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
427 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON)))))
428 revents |= events & (POLLOUT | POLLWRNORM);
429
430 if (events & POLLHUP)
431 if ((tp->t_state & TS_CARR_ON) == 0)
432 revents |= POLLHUP;
433
434 if (revents == 0) {
435 if (events & (POLLIN | POLLRDNORM))
436 selrecord(td, &pt->pt_selr);
437
438 if (events & (POLLOUT | POLLWRNORM))
439 selrecord(td, &pt->pt_selw);
440 }
441 splx(s);
442
443 return (revents);
444}
445
446static int
447ptcwrite(struct cdev *dev, struct uio *uio, int flag)
448{
449 struct tty *tp = dev->si_tty;
450 u_char *cp = 0;
451 int cc = 0;
452 u_char locbuf[BUFSIZ];
453 int cnt = 0;
454 int error = 0;
455
456again:
457 if ((tp->t_state&TS_ISOPEN) == 0)
458 goto block;
459 while (uio->uio_resid > 0 || cc > 0) {
460 if (cc == 0) {
461 cc = min(uio->uio_resid, BUFSIZ);
462 cp = locbuf;
463 error = uiomove(cp, cc, uio);
464 if (error)
465 return (error);
466 /* check again for safety */
467 if ((tp->t_state & TS_ISOPEN) == 0) {
468 /* adjust for data copied in but not written */
469 uio->uio_resid += cc;
470 return (EIO);
471 }
472 }
473 while (cc > 0) {
474 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
475 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
476 wakeup(TSA_HUP_OR_INPUT(tp));
477 goto block;
478 }
479 ttyld_rint(tp, *cp++);
480 cnt++;
481 cc--;
482 }
483 cc = 0;
484 }
485 return (0);
486block:
487 /*
488 * Come here to wait for slave to open, for space
489 * in outq, or space in rawq, or an empty canq.
490 */
491 if ((tp->t_state & TS_CONNECTED) == 0) {
492 /* adjust for data copied in but not written */
493 uio->uio_resid += cc;
494 return (EIO);
495 }
496 if (flag & O_NONBLOCK) {
497 /* adjust for data copied in but not written */
498 uio->uio_resid += cc;
499 if (cnt == 0)
500 return (EWOULDBLOCK);
501 return (0);
502 }
503 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0);
504 if (error) {
505 /* adjust for data copied in but not written */
506 uio->uio_resid += cc;
507 return (error);
508 }
509 goto again;
510}
511
512/*ARGSUSED*/
513static int
514ptcioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
515{
516 struct tty *tp = dev->si_tty;
517 struct ptsc *pt = dev->si_drv1;
518
519 switch (cmd) {
520
521 case TIOCGPGRP:
522 /*
523 * We avoid calling ttioctl on the controller since,
524 * in that case, tp must be the controlling terminal.
525 */
526 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
527 return (0);
528
529 case TIOCPKT:
530 if (*(int *)data) {
531 if (pt->pt_flags & PF_UCNTL)
532 return (EINVAL);
533 pt->pt_flags |= PF_PKT;
534 } else
535 pt->pt_flags &= ~PF_PKT;
536 return (0);
537
538 case TIOCUCNTL:
539 if (*(int *)data) {
540 if (pt->pt_flags & PF_PKT)
541 return (EINVAL);
542 pt->pt_flags |= PF_UCNTL;
543 } else
544 pt->pt_flags &= ~PF_UCNTL;
545 return (0);
546 }
547
548 /*
549 * The rest of the ioctls shouldn't be called until
550 * the slave is open.
551 */
552 if ((tp->t_state & TS_ISOPEN) == 0)
553 return (EAGAIN);
554
555 switch (cmd) {
556#ifndef BURN_BRIDGES
557#ifdef COMPAT_43
558 case TIOCSETP:
559 case TIOCSETN:
560#endif
561#endif
562 case TIOCSETD:
563 case TIOCSETA:
564 case TIOCSETAW:
565 case TIOCSETAF:
566 /*
567 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
568 * ttywflush(tp) will hang if there are characters in
569 * the outq.
570 */
571 ndflush(&tp->t_outq, tp->t_outq.c_cc);
572 break;
573
574 case TIOCSIG:
575 if (*(unsigned int *)data >= NSIG ||
576 *(unsigned int *)data == 0)
577 return(EINVAL);
578 if ((tp->t_lflag&NOFLSH) == 0)
579 ttyflush(tp, FREAD|FWRITE);
580 if (tp->t_pgrp != NULL) {
581 PGRP_LOCK(tp->t_pgrp);
582 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1);
583 PGRP_UNLOCK(tp->t_pgrp);
584 }
585 if ((*(unsigned int *)data == SIGINFO) &&
586 ((tp->t_lflag&NOKERNINFO) == 0))
587 ttyinfo(tp);
588 return(0);
589 }
590
591 return (ptsioctl(dev, cmd, data, flag, td));
592}
593
594/*ARGSUSED*/
595static int
596ptsioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
597{
598 struct tty *tp = dev->si_tty;
599 struct ptsc *pt = dev->si_drv1;
600 u_char *cc = tp->t_cc;
601 int stop, error;
602
603 if (cmd == TIOCEXT) {
604 /*
605 * When the EXTPROC bit is being toggled, we need
606 * to send an TIOCPKT_IOCTL if the packet driver
607 * is turned on.
608 */
609 if (*(int *)data) {
610 if (pt->pt_flags & PF_PKT) {
611 pt->pt_send |= TIOCPKT_IOCTL;
612 ptcwakeup(tp, FREAD);
613 }
614 tp->t_lflag |= EXTPROC;
615 } else {
616 if ((tp->t_lflag & EXTPROC) &&
617 (pt->pt_flags & PF_PKT)) {
618 pt->pt_send |= TIOCPKT_IOCTL;
619 ptcwakeup(tp, FREAD);
620 }
621 tp->t_lflag &= ~EXTPROC;
622 }
623 return(0);
624 }
625 error = ttyioctl(dev, cmd, data, flag, td);
626 if (error == ENOTTY) {
627 if (pt->pt_flags & PF_UCNTL &&
628 (cmd & ~0xff) == UIOCCMD(0)) {
629 if (cmd & 0xff) {
630 pt->pt_ucntl = (u_char)cmd;
631 ptcwakeup(tp, FREAD);
632 }
633 return (0);
634 }
635 error = ENOTTY;
636 }
637 /*
638 * If external processing and packet mode send ioctl packet.
639 */
640 if ((tp->t_lflag&EXTPROC) && (pt->pt_flags & PF_PKT)) {
641 switch(cmd) {
642 case TIOCSETA:
643 case TIOCSETAW:
644 case TIOCSETAF:
645#ifndef BURN_BRIDGES
646#ifdef COMPAT_43
647 case TIOCSETP:
648 case TIOCSETN:
649 case TIOCSETC:
650 case TIOCSLTC:
651 case TIOCLBIS:
652 case TIOCLBIC:
653 case TIOCLSET:
654#endif
655#endif
656 pt->pt_send |= TIOCPKT_IOCTL;
657 ptcwakeup(tp, FREAD);
658 break;
659 default:
660 break;
661 }
662 }
663 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
664 && CCEQ(cc[VSTART], CTRL('q'));
665 if (pt->pt_flags & PF_NOSTOP) {
666 if (stop) {
667 pt->pt_send &= ~TIOCPKT_NOSTOP;
668 pt->pt_send |= TIOCPKT_DOSTOP;
669 pt->pt_flags &= ~PF_NOSTOP;
670 ptcwakeup(tp, FREAD);
671 }
672 } else {
673 if (!stop) {
674 pt->pt_send &= ~TIOCPKT_DOSTOP;
675 pt->pt_send |= TIOCPKT_NOSTOP;
676 pt->pt_flags |= PF_NOSTOP;
677 ptcwakeup(tp, FREAD);
678 }
679 }
680 return (error);
681}
682
683static void
684pty_clone(void *arg, char *name, int namelen, struct cdev **dev)
685{
686 int u;
687
688 if (*dev != NULL)
689 return;
690 if (bcmp(name, "pty", 3) != 0)
691 return;
692 if (name[5] != '\0')
693 return;
694 switch (name[3]) {
695 case 'p': u = 0; break;
696 case 'q': u = 32; break;
697 case 'r': u = 64; break;
698 case 's': u = 96; break;
699 case 'P': u = 128; break;
700 case 'Q': u = 160; break;
701 case 'R': u = 192; break;
702 case 'S': u = 224; break;
703 default: return;
704 }
705 if (name[4] >= '0' && name[4] <= '9')
706 u += name[4] - '0';
707 else if (name[4] >= 'a' && name[4] <= 'v')
708 u += name[4] - 'a' + 10;
709 else
710 return;
711 *dev = make_dev(&ptc_cdevsw, u,
712 UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32);
| 34
35/*
36 * Pseudo-teletype Driver
37 * (Actually two drivers, requiring two entries in 'cdevsw')
38 */
39#include "opt_compat.h"
40#include "opt_tty.h"
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/lock.h>
44#include <sys/mutex.h>
45#include <sys/sx.h>
46#ifndef BURN_BRIDGES
47#if defined(COMPAT_43)
48#include <sys/ioctl_compat.h>
49#endif
50#endif
51#include <sys/proc.h>
52#include <sys/tty.h>
53#include <sys/conf.h>
54#include <sys/fcntl.h>
55#include <sys/poll.h>
56#include <sys/kernel.h>
57#include <sys/uio.h>
58#include <sys/signalvar.h>
59#include <sys/malloc.h>
60
61static MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
62
63static void ptsstart(struct tty *tp);
64static void ptsstop(struct tty *tp, int rw);
65static void ptcwakeup(struct tty *tp, int flag);
66static struct cdev *ptyinit(struct cdev *cdev);
67
68static d_open_t ptsopen;
69static d_close_t ptsclose;
70static d_read_t ptsread;
71static d_write_t ptswrite;
72static d_ioctl_t ptsioctl;
73static d_open_t ptcopen;
74static d_close_t ptcclose;
75static d_read_t ptcread;
76static d_ioctl_t ptcioctl;
77static d_write_t ptcwrite;
78static d_poll_t ptcpoll;
79
80static struct cdevsw pts_cdevsw = {
81 .d_version = D_VERSION,
82 .d_open = ptsopen,
83 .d_close = ptsclose,
84 .d_read = ptsread,
85 .d_write = ptswrite,
86 .d_ioctl = ptsioctl,
87 .d_name = "pts",
88 .d_flags = D_TTY | D_NEEDGIANT,
89};
90
91static struct cdevsw ptc_cdevsw = {
92 .d_version = D_VERSION,
93 .d_open = ptcopen,
94 .d_close = ptcclose,
95 .d_read = ptcread,
96 .d_write = ptcwrite,
97 .d_ioctl = ptcioctl,
98 .d_poll = ptcpoll,
99 .d_name = "ptc",
100 .d_flags = D_TTY | D_NEEDGIANT,
101};
102
103#define BUFSIZ 100 /* Chunk size iomoved to/from user */
104
105struct ptsc {
106 int pt_flags;
107 struct selinfo pt_selr, pt_selw;
108 u_char pt_send;
109 u_char pt_ucntl;
110 struct tty *pt_tty;
111 struct cdev *devs, *devc;
112 struct prison *pt_prison;
113};
114
115#define PF_PKT 0x08 /* packet mode */
116#define PF_STOPPED 0x10 /* user told stopped */
117#define PF_NOSTOP 0x40
118#define PF_UCNTL 0x80 /* user control mode */
119
120#define TSA_PTC_READ(tp) ((void *)&(tp)->t_outq.c_cf)
121#define TSA_PTC_WRITE(tp) ((void *)&(tp)->t_rawq.c_cl)
122#define TSA_PTS_READ(tp) ((void *)&(tp)->t_canq)
123
124static char *names = "pqrsPQRS";
125/*
126 * This function creates and initializes a pts/ptc pair
127 *
128 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
129 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
130 *
131 * XXX: define and add mapping of upper minor bits to allow more
132 * than 256 ptys.
133 */
134static struct cdev *
135ptyinit(struct cdev *devc)
136{
137 struct cdev *devs;
138 struct ptsc *pt;
139 int n;
140
141 n = minor(devc);
142 /* For now we only map the lower 8 bits of the minor */
143 if (n & ~0xff)
144 return (NULL);
145
146 devc->si_flags &= ~SI_CHEAPCLONE;
147
148 pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
149 pt->devs = devs = make_dev(&pts_cdevsw, n,
150 UID_ROOT, GID_WHEEL, 0666, "tty%c%r", names[n / 32], n % 32);
151 pt->devc = devc;
152
153 pt->pt_tty = ttymalloc(pt->pt_tty);
154 pt->pt_tty->t_sc = pt;
155 devs->si_drv1 = devc->si_drv1 = pt;
156 devs->si_tty = devc->si_tty = pt->pt_tty;
157 pt->pt_tty->t_dev = devs;
158 return (devc);
159}
160
161/*ARGSUSED*/
162static int
163ptsopen(struct cdev *dev, int flag, int devtype, struct thread *td)
164{
165 struct tty *tp;
166 int error;
167 struct ptsc *pt;
168
169 if (!dev->si_drv1)
170 return(ENXIO);
171 pt = dev->si_drv1;
172 tp = dev->si_tty;
173 if ((tp->t_state & TS_ISOPEN) == 0) {
174 ttyinitmode(tp, 1, 0);
175 } else if (tp->t_state & TS_XCLUDE && suser(td))
176 return (EBUSY);
177 else if (pt->pt_prison != td->td_ucred->cr_prison)
178 return (EBUSY);
179 if (tp->t_oproc) /* Ctrlr still around. */
180 (void)ttyld_modem(tp, 1);
181 while ((tp->t_state & TS_CARR_ON) == 0) {
182 if (flag&FNONBLOCK)
183 break;
184 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
185 "ptsopn", 0);
186 if (error)
187 return (error);
188 }
189 error = ttyld_open(tp, dev);
190 if (error == 0)
191 ptcwakeup(tp, FREAD|FWRITE);
192 return (error);
193}
194
195static int
196ptsclose(struct cdev *dev, int flag, int mode, struct thread *td)
197{
198 struct tty *tp;
199 int err;
200
201 tp = dev->si_tty;
202 err = ttyld_close(tp, flag);
203 (void) tty_close(tp);
204 return (err);
205}
206
207static int
208ptsread(struct cdev *dev, struct uio *uio, int flag)
209{
210 struct tty *tp = dev->si_tty;
211 int error = 0;
212
213 if (tp->t_oproc)
214 error = ttyld_read(tp, uio, flag);
215 ptcwakeup(tp, FWRITE);
216 return (error);
217}
218
219/*
220 * Write to pseudo-tty.
221 * Wakeups of controlling tty will happen
222 * indirectly, when tty driver calls ptsstart.
223 */
224static int
225ptswrite(struct cdev *dev, struct uio *uio, int flag)
226{
227 struct tty *tp;
228
229 tp = dev->si_tty;
230 if (tp->t_oproc == 0)
231 return (EIO);
232 return (ttyld_write(tp, uio, flag));
233}
234
235/*
236 * Start output on pseudo-tty.
237 * Wake up process selecting or sleeping for input from controlling tty.
238 */
239static void
240ptsstart(struct tty *tp)
241{
242 struct ptsc *pt = tp->t_sc;
243
244 if (tp->t_state & TS_TTSTOP)
245 return;
246 if (pt->pt_flags & PF_STOPPED) {
247 pt->pt_flags &= ~PF_STOPPED;
248 pt->pt_send = TIOCPKT_START;
249 }
250 ptcwakeup(tp, FREAD);
251}
252
253static void
254ptcwakeup(struct tty *tp, int flag)
255{
256 struct ptsc *pt = tp->t_sc;
257
258 if (flag & FREAD) {
259 selwakeuppri(&pt->pt_selr, TTIPRI);
260 wakeup(TSA_PTC_READ(tp));
261 }
262 if (flag & FWRITE) {
263 selwakeuppri(&pt->pt_selw, TTOPRI);
264 wakeup(TSA_PTC_WRITE(tp));
265 }
266}
267
268static int
269ptcopen(struct cdev *dev, int flag, int devtype, struct thread *td)
270{
271 struct tty *tp;
272 struct ptsc *pt;
273
274 if (!dev->si_drv1)
275 ptyinit(dev);
276 if (!dev->si_drv1)
277 return(ENXIO);
278 tp = dev->si_tty;
279 if (tp->t_oproc)
280 return (EIO);
281 tp->t_timeout = -1;
282 tp->t_oproc = ptsstart;
283 tp->t_stop = ptsstop;
284 (void)ttyld_modem(tp, 1);
285 tp->t_lflag &= ~EXTPROC;
286 pt = dev->si_drv1;
287 pt->pt_prison = td->td_ucred->cr_prison;
288 pt->pt_flags = 0;
289 pt->pt_send = 0;
290 pt->pt_ucntl = 0;
291 return (0);
292}
293
294static int
295ptcclose(struct cdev *dev, int flags, int fmt, struct thread *td)
296{
297 struct tty *tp;
298
299 tp = dev->si_tty;
300 (void)ttyld_modem(tp, 0);
301
302 /*
303 * XXX MDMBUF makes no sense for ptys but would inhibit the above
304 * l_modem(). CLOCAL makes sense but isn't supported. Special
305 * l_modem()s that ignore carrier drop make no sense for ptys but
306 * may be in use because other parts of the line discipline make
307 * sense for ptys. Recover by doing everything that a normal
308 * ttymodem() would have done except for sending a SIGHUP.
309 */
310 if (tp->t_state & TS_ISOPEN) {
311 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
312 tp->t_state |= TS_ZOMBIE;
313 ttyflush(tp, FREAD | FWRITE);
314 }
315
316 tp->t_oproc = 0; /* mark closed */
317 return (0);
318}
319
320static int
321ptcread(struct cdev *dev, struct uio *uio, int flag)
322{
323 struct tty *tp = dev->si_tty;
324 struct ptsc *pt = dev->si_drv1;
325 char buf[BUFSIZ];
326 int error = 0, cc;
327
328 /*
329 * We want to block until the slave
330 * is open, and there's something to read;
331 * but if we lost the slave or we're NBIO,
332 * then return the appropriate error instead.
333 */
334 for (;;) {
335 if (tp->t_state&TS_ISOPEN) {
336 if (pt->pt_flags&PF_PKT && pt->pt_send) {
337 error = ureadc((int)pt->pt_send, uio);
338 if (error)
339 return (error);
340 if (pt->pt_send & TIOCPKT_IOCTL) {
341 cc = min(uio->uio_resid,
342 sizeof(tp->t_termios));
343 uiomove(&tp->t_termios, cc, uio);
344 }
345 pt->pt_send = 0;
346 return (0);
347 }
348 if (pt->pt_flags&PF_UCNTL && pt->pt_ucntl) {
349 error = ureadc((int)pt->pt_ucntl, uio);
350 if (error)
351 return (error);
352 pt->pt_ucntl = 0;
353 return (0);
354 }
355 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
356 break;
357 }
358 if ((tp->t_state & TS_CONNECTED) == 0)
359 return (0); /* EOF */
360 if (flag & O_NONBLOCK)
361 return (EWOULDBLOCK);
362 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0);
363 if (error)
364 return (error);
365 }
366 if (pt->pt_flags & (PF_PKT|PF_UCNTL))
367 error = ureadc(0, uio);
368 while (uio->uio_resid > 0 && error == 0) {
369 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ));
370 if (cc <= 0)
371 break;
372 error = uiomove(buf, cc, uio);
373 }
374 ttwwakeup(tp);
375 return (error);
376}
377
378static void
379ptsstop(struct tty *tp, int flush)
380{
381 struct ptsc *pt = tp->t_sc;
382 int flag;
383
384 /* note: FLUSHREAD and FLUSHWRITE already ok */
385 if (flush == 0) {
386 flush = TIOCPKT_STOP;
387 pt->pt_flags |= PF_STOPPED;
388 } else
389 pt->pt_flags &= ~PF_STOPPED;
390 pt->pt_send |= flush;
391 /* change of perspective */
392 flag = 0;
393 if (flush & FREAD)
394 flag |= FWRITE;
395 if (flush & FWRITE)
396 flag |= FREAD;
397 ptcwakeup(tp, flag);
398}
399
400static int
401ptcpoll(struct cdev *dev, int events, struct thread *td)
402{
403 struct tty *tp = dev->si_tty;
404 struct ptsc *pt = dev->si_drv1;
405 int revents = 0;
406 int s;
407
408 if ((tp->t_state & TS_CONNECTED) == 0)
409 return (events &
410 (POLLHUP | POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM));
411
412 /*
413 * Need to block timeouts (ttrstart).
414 */
415 s = spltty();
416
417 if (events & (POLLIN | POLLRDNORM))
418 if ((tp->t_state & TS_ISOPEN) &&
419 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
420 ((pt->pt_flags & PF_PKT) && pt->pt_send) ||
421 ((pt->pt_flags & PF_UCNTL) && pt->pt_ucntl)))
422 revents |= events & (POLLIN | POLLRDNORM);
423
424 if (events & (POLLOUT | POLLWRNORM))
425 if (tp->t_state & TS_ISOPEN &&
426 (((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
427 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON)))))
428 revents |= events & (POLLOUT | POLLWRNORM);
429
430 if (events & POLLHUP)
431 if ((tp->t_state & TS_CARR_ON) == 0)
432 revents |= POLLHUP;
433
434 if (revents == 0) {
435 if (events & (POLLIN | POLLRDNORM))
436 selrecord(td, &pt->pt_selr);
437
438 if (events & (POLLOUT | POLLWRNORM))
439 selrecord(td, &pt->pt_selw);
440 }
441 splx(s);
442
443 return (revents);
444}
445
446static int
447ptcwrite(struct cdev *dev, struct uio *uio, int flag)
448{
449 struct tty *tp = dev->si_tty;
450 u_char *cp = 0;
451 int cc = 0;
452 u_char locbuf[BUFSIZ];
453 int cnt = 0;
454 int error = 0;
455
456again:
457 if ((tp->t_state&TS_ISOPEN) == 0)
458 goto block;
459 while (uio->uio_resid > 0 || cc > 0) {
460 if (cc == 0) {
461 cc = min(uio->uio_resid, BUFSIZ);
462 cp = locbuf;
463 error = uiomove(cp, cc, uio);
464 if (error)
465 return (error);
466 /* check again for safety */
467 if ((tp->t_state & TS_ISOPEN) == 0) {
468 /* adjust for data copied in but not written */
469 uio->uio_resid += cc;
470 return (EIO);
471 }
472 }
473 while (cc > 0) {
474 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
475 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
476 wakeup(TSA_HUP_OR_INPUT(tp));
477 goto block;
478 }
479 ttyld_rint(tp, *cp++);
480 cnt++;
481 cc--;
482 }
483 cc = 0;
484 }
485 return (0);
486block:
487 /*
488 * Come here to wait for slave to open, for space
489 * in outq, or space in rawq, or an empty canq.
490 */
491 if ((tp->t_state & TS_CONNECTED) == 0) {
492 /* adjust for data copied in but not written */
493 uio->uio_resid += cc;
494 return (EIO);
495 }
496 if (flag & O_NONBLOCK) {
497 /* adjust for data copied in but not written */
498 uio->uio_resid += cc;
499 if (cnt == 0)
500 return (EWOULDBLOCK);
501 return (0);
502 }
503 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0);
504 if (error) {
505 /* adjust for data copied in but not written */
506 uio->uio_resid += cc;
507 return (error);
508 }
509 goto again;
510}
511
512/*ARGSUSED*/
513static int
514ptcioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
515{
516 struct tty *tp = dev->si_tty;
517 struct ptsc *pt = dev->si_drv1;
518
519 switch (cmd) {
520
521 case TIOCGPGRP:
522 /*
523 * We avoid calling ttioctl on the controller since,
524 * in that case, tp must be the controlling terminal.
525 */
526 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
527 return (0);
528
529 case TIOCPKT:
530 if (*(int *)data) {
531 if (pt->pt_flags & PF_UCNTL)
532 return (EINVAL);
533 pt->pt_flags |= PF_PKT;
534 } else
535 pt->pt_flags &= ~PF_PKT;
536 return (0);
537
538 case TIOCUCNTL:
539 if (*(int *)data) {
540 if (pt->pt_flags & PF_PKT)
541 return (EINVAL);
542 pt->pt_flags |= PF_UCNTL;
543 } else
544 pt->pt_flags &= ~PF_UCNTL;
545 return (0);
546 }
547
548 /*
549 * The rest of the ioctls shouldn't be called until
550 * the slave is open.
551 */
552 if ((tp->t_state & TS_ISOPEN) == 0)
553 return (EAGAIN);
554
555 switch (cmd) {
556#ifndef BURN_BRIDGES
557#ifdef COMPAT_43
558 case TIOCSETP:
559 case TIOCSETN:
560#endif
561#endif
562 case TIOCSETD:
563 case TIOCSETA:
564 case TIOCSETAW:
565 case TIOCSETAF:
566 /*
567 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
568 * ttywflush(tp) will hang if there are characters in
569 * the outq.
570 */
571 ndflush(&tp->t_outq, tp->t_outq.c_cc);
572 break;
573
574 case TIOCSIG:
575 if (*(unsigned int *)data >= NSIG ||
576 *(unsigned int *)data == 0)
577 return(EINVAL);
578 if ((tp->t_lflag&NOFLSH) == 0)
579 ttyflush(tp, FREAD|FWRITE);
580 if (tp->t_pgrp != NULL) {
581 PGRP_LOCK(tp->t_pgrp);
582 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1);
583 PGRP_UNLOCK(tp->t_pgrp);
584 }
585 if ((*(unsigned int *)data == SIGINFO) &&
586 ((tp->t_lflag&NOKERNINFO) == 0))
587 ttyinfo(tp);
588 return(0);
589 }
590
591 return (ptsioctl(dev, cmd, data, flag, td));
592}
593
594/*ARGSUSED*/
595static int
596ptsioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
597{
598 struct tty *tp = dev->si_tty;
599 struct ptsc *pt = dev->si_drv1;
600 u_char *cc = tp->t_cc;
601 int stop, error;
602
603 if (cmd == TIOCEXT) {
604 /*
605 * When the EXTPROC bit is being toggled, we need
606 * to send an TIOCPKT_IOCTL if the packet driver
607 * is turned on.
608 */
609 if (*(int *)data) {
610 if (pt->pt_flags & PF_PKT) {
611 pt->pt_send |= TIOCPKT_IOCTL;
612 ptcwakeup(tp, FREAD);
613 }
614 tp->t_lflag |= EXTPROC;
615 } else {
616 if ((tp->t_lflag & EXTPROC) &&
617 (pt->pt_flags & PF_PKT)) {
618 pt->pt_send |= TIOCPKT_IOCTL;
619 ptcwakeup(tp, FREAD);
620 }
621 tp->t_lflag &= ~EXTPROC;
622 }
623 return(0);
624 }
625 error = ttyioctl(dev, cmd, data, flag, td);
626 if (error == ENOTTY) {
627 if (pt->pt_flags & PF_UCNTL &&
628 (cmd & ~0xff) == UIOCCMD(0)) {
629 if (cmd & 0xff) {
630 pt->pt_ucntl = (u_char)cmd;
631 ptcwakeup(tp, FREAD);
632 }
633 return (0);
634 }
635 error = ENOTTY;
636 }
637 /*
638 * If external processing and packet mode send ioctl packet.
639 */
640 if ((tp->t_lflag&EXTPROC) && (pt->pt_flags & PF_PKT)) {
641 switch(cmd) {
642 case TIOCSETA:
643 case TIOCSETAW:
644 case TIOCSETAF:
645#ifndef BURN_BRIDGES
646#ifdef COMPAT_43
647 case TIOCSETP:
648 case TIOCSETN:
649 case TIOCSETC:
650 case TIOCSLTC:
651 case TIOCLBIS:
652 case TIOCLBIC:
653 case TIOCLSET:
654#endif
655#endif
656 pt->pt_send |= TIOCPKT_IOCTL;
657 ptcwakeup(tp, FREAD);
658 break;
659 default:
660 break;
661 }
662 }
663 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
664 && CCEQ(cc[VSTART], CTRL('q'));
665 if (pt->pt_flags & PF_NOSTOP) {
666 if (stop) {
667 pt->pt_send &= ~TIOCPKT_NOSTOP;
668 pt->pt_send |= TIOCPKT_DOSTOP;
669 pt->pt_flags &= ~PF_NOSTOP;
670 ptcwakeup(tp, FREAD);
671 }
672 } else {
673 if (!stop) {
674 pt->pt_send &= ~TIOCPKT_DOSTOP;
675 pt->pt_send |= TIOCPKT_NOSTOP;
676 pt->pt_flags |= PF_NOSTOP;
677 ptcwakeup(tp, FREAD);
678 }
679 }
680 return (error);
681}
682
683static void
684pty_clone(void *arg, char *name, int namelen, struct cdev **dev)
685{
686 int u;
687
688 if (*dev != NULL)
689 return;
690 if (bcmp(name, "pty", 3) != 0)
691 return;
692 if (name[5] != '\0')
693 return;
694 switch (name[3]) {
695 case 'p': u = 0; break;
696 case 'q': u = 32; break;
697 case 'r': u = 64; break;
698 case 's': u = 96; break;
699 case 'P': u = 128; break;
700 case 'Q': u = 160; break;
701 case 'R': u = 192; break;
702 case 'S': u = 224; break;
703 default: return;
704 }
705 if (name[4] >= '0' && name[4] <= '9')
706 u += name[4] - '0';
707 else if (name[4] >= 'a' && name[4] <= 'v')
708 u += name[4] - 'a' + 10;
709 else
710 return;
711 *dev = make_dev(&ptc_cdevsw, u,
712 UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32);
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