kernel tree reorganization stage 1: Major cvs repository work (not logged as
[dragonfly.git] / sys / kern / tty_pty.c
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  *      @(#)tty_pty.c   8.4 (Berkeley) 2/20/95
34  * $FreeBSD: src/sys/kern/tty_pty.c,v 1.74.2.4 2002/02/20 19:58:13 dillon Exp $
35  * $DragonFly: src/sys/kern/tty_pty.c,v 1.9 2003/08/07 21:17:23 dillon Exp $
36  */
37
38 /*
39  * Pseudo-teletype Driver
40  * (Actually two drivers, requiring two entries in 'cdevsw')
41  */
42 #include "use_pty.h"            /* XXX */
43 #include "opt_compat.h"
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
48 #include <sys/ioctl_compat.h>
49 #endif
50 #include <sys/proc.h>
51 #include <sys/tty.h>
52 #include <sys/conf.h>
53 #include <sys/fcntl.h>
54 #include <sys/poll.h>
55 #include <sys/kernel.h>
56 #include <sys/vnode.h>
57 #include <sys/signalvar.h>
58 #include <sys/malloc.h>
59 #include <sys/device.h>
60
61 MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
62
63 static void ptsstart __P((struct tty *tp));
64 static void ptsstop __P((struct tty *tp, int rw));
65 static void ptcwakeup __P((struct tty *tp, int flag));
66 static void ptyinit __P((int n));
67
68 static  d_open_t        ptsopen;
69 static  d_close_t       ptsclose;
70 static  d_read_t        ptsread;
71 static  d_write_t       ptswrite;
72 static  d_ioctl_t       ptyioctl;
73 static  d_open_t        ptcopen;
74 static  d_close_t       ptcclose;
75 static  d_read_t        ptcread;
76 static  d_write_t       ptcwrite;
77 static  d_poll_t        ptcpoll;
78
79 #define CDEV_MAJOR_S    5
80 static struct cdevsw pts_cdevsw = {
81         /* name */      "pts",
82         /* maj */       CDEV_MAJOR_S,
83         /* flags */     D_TTY | D_KQFILTER,
84         /* port */      NULL,
85         /* autoq */     0,
86
87         /* open */      ptsopen,
88         /* close */     ptsclose,
89         /* read */      ptsread,
90         /* write */     ptswrite,
91         /* ioctl */     ptyioctl,
92         /* poll */      ttypoll,
93         /* mmap */      nommap,
94         /* strategy */  nostrategy,
95         /* dump */      nodump,
96         /* psize */     nopsize,
97         /* kqfilter */  ttykqfilter
98 };
99
100 #define CDEV_MAJOR_C    6
101 static struct cdevsw ptc_cdevsw = {
102         /* name */      "ptc",
103         /* maj */       CDEV_MAJOR_C,
104         /* flags */     D_TTY | D_KQFILTER | D_MASTER,
105         /* port */      NULL,
106         /* autoq */     0,
107
108         /* open */      ptcopen,
109         /* close */     ptcclose,
110         /* read */      ptcread,
111         /* write */     ptcwrite,
112         /* ioctl */     ptyioctl,
113         /* poll */      ptcpoll,
114         /* mmap */      nommap,
115         /* strategy */  nostrategy,
116         /* dump */      nodump,
117         /* psize */     nopsize,
118         /* kqfilter */  ttykqfilter
119 };
120
121 #define BUFSIZ 100              /* Chunk size iomoved to/from user */
122
123 struct  pt_ioctl {
124         int     pt_flags;
125         struct  selinfo pt_selr, pt_selw;
126         u_char  pt_send;
127         u_char  pt_ucntl;
128         struct tty pt_tty;
129         dev_t   devs, devc;
130         struct  prison *pt_prison;
131 };
132
133 #define PF_PKT          0x08            /* packet mode */
134 #define PF_STOPPED      0x10            /* user told stopped */
135 #define PF_REMOTE       0x20            /* remote and flow controlled input */
136 #define PF_NOSTOP       0x40
137 #define PF_UCNTL        0x80            /* user control mode */
138
139 /*
140  * This function creates and initializes a pts/ptc pair
141  *
142  * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
143  * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
144  *
145  * XXX: define and add mapping of upper minor bits to allow more 
146  *      than 256 ptys.
147  */
148 static void
149 ptyinit(n)
150         int n;
151 {
152         dev_t devs, devc;
153         char *names = "pqrsPQRS";
154         struct pt_ioctl *pt;
155
156         /* For now we only map the lower 8 bits of the minor */
157         if (n & ~0xff)
158                 return;
159
160         pt = malloc(sizeof(*pt), M_PTY, M_WAITOK);
161         bzero(pt, sizeof(*pt));
162         pt->devs = devs = make_dev(&pts_cdevsw, n,
163             0, 0, 0666, "tty%c%r", names[n / 32], n % 32);
164         pt->devc = devc = make_dev(&ptc_cdevsw, n,
165             0, 0, 0666, "pty%c%r", names[n / 32], n % 32);
166
167         devs->si_drv1 = devc->si_drv1 = pt;
168         devs->si_tty = devc->si_tty = &pt->pt_tty;
169         pt->pt_tty.t_dev = devs;
170         ttyregister(&pt->pt_tty);
171 }
172
173 /*ARGSUSED*/
174 static  int
175 ptsopen(dev_t dev, int flag, int devtype, struct thread *td)
176 {
177         struct tty *tp;
178         int error;
179         int minr;
180         dev_t nextdev;
181         struct pt_ioctl *pti;
182         struct proc *p;
183
184         p = td->td_proc;
185         KKASSERT(p != NULL);
186
187         /*
188          * XXX: Gross hack for DEVFS:
189          * XXX: DEVFS is no more, should this be removed?
190          * If we openned this device, ensure we have the
191          * next one too, so people can open it.
192          */
193         minr = lminor(dev);
194         if (minr < 255) {
195                 nextdev = makedev(major(dev), minr + 1);
196                 if (!nextdev->si_drv1) {
197                         ptyinit(minr + 1);
198                 }
199         }
200         if (!dev->si_drv1)
201                 ptyinit(minor(dev));
202         if (!dev->si_drv1)
203                 return(ENXIO);  
204         pti = dev->si_drv1;
205         tp = dev->si_tty;
206         if ((tp->t_state & TS_ISOPEN) == 0) {
207                 ttychars(tp);           /* Set up default chars */
208                 tp->t_iflag = TTYDEF_IFLAG;
209                 tp->t_oflag = TTYDEF_OFLAG;
210                 tp->t_lflag = TTYDEF_LFLAG;
211                 tp->t_cflag = TTYDEF_CFLAG;
212                 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
213         } else if (tp->t_state & TS_XCLUDE && suser(td)) {
214                 return (EBUSY);
215         } else if (pti->pt_prison != p->p_ucred->cr_prison) {
216                 return (EBUSY);
217         }
218         if (tp->t_oproc)                        /* Ctrlr still around. */
219                 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
220         while ((tp->t_state & TS_CARR_ON) == 0) {
221                 if (flag&FNONBLOCK)
222                         break;
223                 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ptsopn", 0);
224                 if (error)
225                         return (error);
226         }
227         error = (*linesw[tp->t_line].l_open)(dev, tp);
228         if (error == 0)
229                 ptcwakeup(tp, FREAD|FWRITE);
230         return (error);
231 }
232
233 static  int
234 ptsclose(dev, flag, mode, td)
235         dev_t dev;
236         int flag, mode;
237         struct thread *td;
238 {
239         struct tty *tp;
240         int err;
241
242         tp = dev->si_tty;
243         err = (*linesw[tp->t_line].l_close)(tp, flag);
244         ptsstop(tp, FREAD|FWRITE);
245         (void) ttyclose(tp);
246         return (err);
247 }
248
249 static  int
250 ptsread(dev, uio, flag)
251         dev_t dev;
252         struct uio *uio;
253         int flag;
254 {
255         struct proc *p = curproc;
256         struct tty *tp = dev->si_tty;
257         struct pt_ioctl *pti = dev->si_drv1;
258         int error = 0;
259
260 again:
261         if (pti->pt_flags & PF_REMOTE) {
262                 while (isbackground(p, tp)) {
263                         if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
264                             SIGISMEMBER(p->p_sigmask, SIGTTIN) ||
265                             p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT)
266                                 return (EIO);
267                         pgsignal(p->p_pgrp, SIGTTIN, 1);
268                         error = ttysleep(tp, &lbolt, PCATCH, "ptsbg", 0);
269                         if (error)
270                                 return (error);
271                 }
272                 if (tp->t_canq.c_cc == 0) {
273                         if (flag & IO_NDELAY)
274                                 return (EWOULDBLOCK);
275                         error = ttysleep(tp, TSA_PTS_READ(tp), PCATCH,
276                                          "ptsin", 0);
277                         if (error)
278                                 return (error);
279                         goto again;
280                 }
281                 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0)
282                         if (ureadc(getc(&tp->t_canq), uio) < 0) {
283                                 error = EFAULT;
284                                 break;
285                         }
286                 if (tp->t_canq.c_cc == 1)
287                         (void) getc(&tp->t_canq);
288                 if (tp->t_canq.c_cc)
289                         return (error);
290         } else
291                 if (tp->t_oproc)
292                         error = (*linesw[tp->t_line].l_read)(tp, uio, flag);
293         ptcwakeup(tp, FWRITE);
294         return (error);
295 }
296
297 /*
298  * Write to pseudo-tty.
299  * Wakeups of controlling tty will happen
300  * indirectly, when tty driver calls ptsstart.
301  */
302 static  int
303 ptswrite(dev, uio, flag)
304         dev_t dev;
305         struct uio *uio;
306         int flag;
307 {
308         struct tty *tp;
309
310         tp = dev->si_tty;
311         if (tp->t_oproc == 0)
312                 return (EIO);
313         return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
314 }
315
316 /*
317  * Start output on pseudo-tty.
318  * Wake up process selecting or sleeping for input from controlling tty.
319  */
320 static void
321 ptsstart(tp)
322         struct tty *tp;
323 {
324         struct pt_ioctl *pti = tp->t_dev->si_drv1;
325
326         if (tp->t_state & TS_TTSTOP)
327                 return;
328         if (pti->pt_flags & PF_STOPPED) {
329                 pti->pt_flags &= ~PF_STOPPED;
330                 pti->pt_send = TIOCPKT_START;
331         }
332         ptcwakeup(tp, FREAD);
333 }
334
335 static void
336 ptcwakeup(tp, flag)
337         struct tty *tp;
338         int flag;
339 {
340         struct pt_ioctl *pti = tp->t_dev->si_drv1;
341
342         if (flag & FREAD) {
343                 selwakeup(&pti->pt_selr);
344                 wakeup(TSA_PTC_READ(tp));
345         }
346         if (flag & FWRITE) {
347                 selwakeup(&pti->pt_selw);
348                 wakeup(TSA_PTC_WRITE(tp));
349         }
350 }
351
352 static  int
353 ptcopen(dev, flag, devtype, td)
354         dev_t dev;
355         int flag, devtype;
356         struct thread *td;
357 {
358         struct tty *tp;
359         struct pt_ioctl *pti;
360
361         if (!dev->si_drv1)
362                 ptyinit(minor(dev));
363         if (!dev->si_drv1)
364                 return(ENXIO);  
365         tp = dev->si_tty;
366         if (tp->t_oproc)
367                 return (EIO);
368         KKASSERT(td->td_proc != NULL);
369         tp->t_oproc = ptsstart;
370         tp->t_stop = ptsstop;
371         (void)(*linesw[tp->t_line].l_modem)(tp, 1);
372         tp->t_lflag &= ~EXTPROC;
373         pti = dev->si_drv1;
374         pti->pt_prison = td->td_proc->p_ucred->cr_prison;
375         pti->pt_flags = 0;
376         pti->pt_send = 0;
377         pti->pt_ucntl = 0;
378         return (0);
379 }
380
381 static  int
382 ptcclose(dev, flags, fmt, td)
383         dev_t dev;
384         int flags;
385         int fmt;
386         struct thread *td;
387 {
388         struct tty *tp;
389
390         tp = dev->si_tty;
391         (void)(*linesw[tp->t_line].l_modem)(tp, 0);
392
393         /*
394          * XXX MDMBUF makes no sense for ptys but would inhibit the above
395          * l_modem().  CLOCAL makes sense but isn't supported.   Special
396          * l_modem()s that ignore carrier drop make no sense for ptys but
397          * may be in use because other parts of the line discipline make
398          * sense for ptys.  Recover by doing everything that a normal
399          * ttymodem() would have done except for sending a SIGHUP.
400          */
401         if (tp->t_state & TS_ISOPEN) {
402                 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
403                 tp->t_state |= TS_ZOMBIE;
404                 ttyflush(tp, FREAD | FWRITE);
405         }
406
407         tp->t_oproc = 0;                /* mark closed */
408         return (0);
409 }
410
411 static  int
412 ptcread(dev, uio, flag)
413         dev_t dev;
414         struct uio *uio;
415         int flag;
416 {
417         struct tty *tp = dev->si_tty;
418         struct pt_ioctl *pti = dev->si_drv1;
419         char buf[BUFSIZ];
420         int error = 0, cc;
421
422         /*
423          * We want to block until the slave
424          * is open, and there's something to read;
425          * but if we lost the slave or we're NBIO,
426          * then return the appropriate error instead.
427          */
428         for (;;) {
429                 if (tp->t_state&TS_ISOPEN) {
430                         if (pti->pt_flags&PF_PKT && pti->pt_send) {
431                                 error = ureadc((int)pti->pt_send, uio);
432                                 if (error)
433                                         return (error);
434                                 if (pti->pt_send & TIOCPKT_IOCTL) {
435                                         cc = min(uio->uio_resid,
436                                                 sizeof(tp->t_termios));
437                                         uiomove((caddr_t)&tp->t_termios, cc,
438                                                 uio);
439                                 }
440                                 pti->pt_send = 0;
441                                 return (0);
442                         }
443                         if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
444                                 error = ureadc((int)pti->pt_ucntl, uio);
445                                 if (error)
446                                         return (error);
447                                 pti->pt_ucntl = 0;
448                                 return (0);
449                         }
450                         if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
451                                 break;
452                 }
453                 if ((tp->t_state & TS_CONNECTED) == 0)
454                         return (0);     /* EOF */
455                 if (flag & IO_NDELAY)
456                         return (EWOULDBLOCK);
457                 error = tsleep(TSA_PTC_READ(tp), PCATCH, "ptcin", 0);
458                 if (error)
459                         return (error);
460         }
461         if (pti->pt_flags & (PF_PKT|PF_UCNTL))
462                 error = ureadc(0, uio);
463         while (uio->uio_resid > 0 && error == 0) {
464                 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ));
465                 if (cc <= 0)
466                         break;
467                 error = uiomove(buf, cc, uio);
468         }
469         ttwwakeup(tp);
470         return (error);
471 }
472
473 static  void
474 ptsstop(tp, flush)
475         struct tty *tp;
476         int flush;
477 {
478         struct pt_ioctl *pti = tp->t_dev->si_drv1;
479         int flag;
480
481         /* note: FLUSHREAD and FLUSHWRITE already ok */
482         if (flush == 0) {
483                 flush = TIOCPKT_STOP;
484                 pti->pt_flags |= PF_STOPPED;
485         } else
486                 pti->pt_flags &= ~PF_STOPPED;
487         pti->pt_send |= flush;
488         /* change of perspective */
489         flag = 0;
490         if (flush & FREAD)
491                 flag |= FWRITE;
492         if (flush & FWRITE)
493                 flag |= FREAD;
494         ptcwakeup(tp, flag);
495 }
496
497 static  int
498 ptcpoll(dev, events, td)
499         dev_t dev;
500         int events;
501         struct thread *td;
502 {
503         struct tty *tp = dev->si_tty;
504         struct pt_ioctl *pti = dev->si_drv1;
505         int revents = 0;
506         int s;
507
508         if ((tp->t_state & TS_CONNECTED) == 0)
509                 return (seltrue(dev, events, td) | POLLHUP);
510
511         /*
512          * Need to block timeouts (ttrstart).
513          */
514         s = spltty();
515
516         if (events & (POLLIN | POLLRDNORM))
517                 if ((tp->t_state & TS_ISOPEN) &&
518                     ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
519                      ((pti->pt_flags & PF_PKT) && pti->pt_send) ||
520                      ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)))
521                         revents |= events & (POLLIN | POLLRDNORM);
522
523         if (events & (POLLOUT | POLLWRNORM))
524                 if (tp->t_state & TS_ISOPEN &&
525                     ((pti->pt_flags & PF_REMOTE) ?
526                      (tp->t_canq.c_cc == 0) : 
527                      ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
528                       (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON)))))
529                         revents |= events & (POLLOUT | POLLWRNORM);
530
531         if (events & POLLHUP)
532                 if ((tp->t_state & TS_CARR_ON) == 0)
533                         revents |= POLLHUP;
534
535         if (revents == 0) {
536                 if (events & (POLLIN | POLLRDNORM))
537                         selrecord(td, &pti->pt_selr);
538
539                 if (events & (POLLOUT | POLLWRNORM)) 
540                         selrecord(td, &pti->pt_selw);
541         }
542         splx(s);
543
544         return (revents);
545 }
546
547 static  int
548 ptcwrite(dev, uio, flag)
549         dev_t dev;
550         struct uio *uio;
551         int flag;
552 {
553         struct tty *tp = dev->si_tty;
554         u_char *cp = 0;
555         int cc = 0;
556         u_char locbuf[BUFSIZ];
557         int cnt = 0;
558         struct pt_ioctl *pti = dev->si_drv1;
559         int error = 0;
560
561 again:
562         if ((tp->t_state&TS_ISOPEN) == 0)
563                 goto block;
564         if (pti->pt_flags & PF_REMOTE) {
565                 if (tp->t_canq.c_cc)
566                         goto block;
567                 while ((uio->uio_resid > 0 || cc > 0) &&
568                        tp->t_canq.c_cc < TTYHOG - 1) {
569                         if (cc == 0) {
570                                 cc = min(uio->uio_resid, BUFSIZ);
571                                 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc);
572                                 cp = locbuf;
573                                 error = uiomove((caddr_t)cp, cc, uio);
574                                 if (error)
575                                         return (error);
576                                 /* check again for safety */
577                                 if ((tp->t_state & TS_ISOPEN) == 0) {
578                                         /* adjust as usual */
579                                         uio->uio_resid += cc;
580                                         return (EIO);
581                                 }
582                         }
583                         if (cc > 0) {
584                                 cc = b_to_q((char *)cp, cc, &tp->t_canq);
585                                 /*
586                                  * XXX we don't guarantee that the canq size
587                                  * is >= TTYHOG, so the above b_to_q() may
588                                  * leave some bytes uncopied.  However, space
589                                  * is guaranteed for the null terminator if
590                                  * we don't fail here since (TTYHOG - 1) is
591                                  * not a multiple of CBSIZE.
592                                  */
593                                 if (cc > 0)
594                                         break;
595                         }
596                 }
597                 /* adjust for data copied in but not written */
598                 uio->uio_resid += cc;
599                 (void) putc(0, &tp->t_canq);
600                 ttwakeup(tp);
601                 wakeup(TSA_PTS_READ(tp));
602                 return (0);
603         }
604         while (uio->uio_resid > 0 || cc > 0) {
605                 if (cc == 0) {
606                         cc = min(uio->uio_resid, BUFSIZ);
607                         cp = locbuf;
608                         error = uiomove((caddr_t)cp, cc, uio);
609                         if (error)
610                                 return (error);
611                         /* check again for safety */
612                         if ((tp->t_state & TS_ISOPEN) == 0) {
613                                 /* adjust for data copied in but not written */
614                                 uio->uio_resid += cc;
615                                 return (EIO);
616                         }
617                 }
618                 while (cc > 0) {
619                         if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
620                            (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
621                                 wakeup(TSA_HUP_OR_INPUT(tp));
622                                 goto block;
623                         }
624                         (*linesw[tp->t_line].l_rint)(*cp++, tp);
625                         cnt++;
626                         cc--;
627                 }
628                 cc = 0;
629         }
630         return (0);
631 block:
632         /*
633          * Come here to wait for slave to open, for space
634          * in outq, or space in rawq, or an empty canq.
635          */
636         if ((tp->t_state & TS_CONNECTED) == 0) {
637                 /* adjust for data copied in but not written */
638                 uio->uio_resid += cc;
639                 return (EIO);
640         }
641         if (flag & IO_NDELAY) {
642                 /* adjust for data copied in but not written */
643                 uio->uio_resid += cc;
644                 if (cnt == 0)
645                         return (EWOULDBLOCK);
646                 return (0);
647         }
648         error = tsleep(TSA_PTC_WRITE(tp), PCATCH, "ptcout", 0);
649         if (error) {
650                 /* adjust for data copied in but not written */
651                 uio->uio_resid += cc;
652                 return (error);
653         }
654         goto again;
655 }
656
657 /*ARGSUSED*/
658 static  int
659 ptyioctl(dev, cmd, data, flag, td)
660         dev_t dev;
661         u_long cmd;
662         caddr_t data;
663         int flag;
664         struct thread *td;
665 {
666         struct tty *tp = dev->si_tty;
667         struct pt_ioctl *pti = dev->si_drv1;
668         u_char *cc = tp->t_cc;
669         int stop, error;
670
671         if (dev_dflags(dev) & D_MASTER) {
672                 switch (cmd) {
673
674                 case TIOCGPGRP:
675                         /*
676                          * We avoid calling ttioctl on the controller since,
677                          * in that case, tp must be the controlling terminal.
678                          */
679                         *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
680                         return (0);
681
682                 case TIOCPKT:
683                         if (*(int *)data) {
684                                 if (pti->pt_flags & PF_UCNTL)
685                                         return (EINVAL);
686                                 pti->pt_flags |= PF_PKT;
687                         } else
688                                 pti->pt_flags &= ~PF_PKT;
689                         return (0);
690
691                 case TIOCUCNTL:
692                         if (*(int *)data) {
693                                 if (pti->pt_flags & PF_PKT)
694                                         return (EINVAL);
695                                 pti->pt_flags |= PF_UCNTL;
696                         } else
697                                 pti->pt_flags &= ~PF_UCNTL;
698                         return (0);
699
700                 case TIOCREMOTE:
701                         if (*(int *)data)
702                                 pti->pt_flags |= PF_REMOTE;
703                         else
704                                 pti->pt_flags &= ~PF_REMOTE;
705                         ttyflush(tp, FREAD|FWRITE);
706                         return (0);
707                 }
708
709                 /*
710                  * The rest of the ioctls shouldn't be called until 
711                  * the slave is open.
712                  */
713                 if ((tp->t_state & TS_ISOPEN) == 0)
714                         return (EAGAIN);
715
716                 switch (cmd) {
717 #ifdef COMPAT_43
718                 case TIOCSETP:
719                 case TIOCSETN:
720 #endif
721                 case TIOCSETD:
722                 case TIOCSETA:
723                 case TIOCSETAW:
724                 case TIOCSETAF:
725                         /*
726                          * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
727                          * ttywflush(tp) will hang if there are characters in
728                          * the outq.
729                          */
730                         ndflush(&tp->t_outq, tp->t_outq.c_cc);
731                         break;
732
733                 case TIOCSIG:
734                         if (*(unsigned int *)data >= NSIG ||
735                             *(unsigned int *)data == 0)
736                                 return(EINVAL);
737                         if ((tp->t_lflag&NOFLSH) == 0)
738                                 ttyflush(tp, FREAD|FWRITE);
739                         pgsignal(tp->t_pgrp, *(unsigned int *)data, 1);
740                         if ((*(unsigned int *)data == SIGINFO) &&
741                             ((tp->t_lflag&NOKERNINFO) == 0))
742                                 ttyinfo(tp);
743                         return(0);
744                 }
745         }
746         if (cmd == TIOCEXT) {
747                 /*
748                  * When the EXTPROC bit is being toggled, we need
749                  * to send an TIOCPKT_IOCTL if the packet driver
750                  * is turned on.
751                  */
752                 if (*(int *)data) {
753                         if (pti->pt_flags & PF_PKT) {
754                                 pti->pt_send |= TIOCPKT_IOCTL;
755                                 ptcwakeup(tp, FREAD);
756                         }
757                         tp->t_lflag |= EXTPROC;
758                 } else {
759                         if ((tp->t_lflag & EXTPROC) &&
760                             (pti->pt_flags & PF_PKT)) {
761                                 pti->pt_send |= TIOCPKT_IOCTL;
762                                 ptcwakeup(tp, FREAD);
763                         }
764                         tp->t_lflag &= ~EXTPROC;
765                 }
766                 return(0);
767         }
768         error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td);
769         if (error == ENOIOCTL)
770                  error = ttioctl(tp, cmd, data, flag);
771         if (error == ENOIOCTL) {
772                 if (pti->pt_flags & PF_UCNTL &&
773                     (cmd & ~0xff) == UIOCCMD(0)) {
774                         if (cmd & 0xff) {
775                                 pti->pt_ucntl = (u_char)cmd;
776                                 ptcwakeup(tp, FREAD);
777                         }
778                         return (0);
779                 }
780                 error = ENOTTY;
781         }
782         /*
783          * If external processing and packet mode send ioctl packet.
784          */
785         if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
786                 switch(cmd) {
787                 case TIOCSETA:
788                 case TIOCSETAW:
789                 case TIOCSETAF:
790 #ifdef COMPAT_43
791                 case TIOCSETP:
792                 case TIOCSETN:
793 #endif
794 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
795                 case TIOCSETC:
796                 case TIOCSLTC:
797                 case TIOCLBIS:
798                 case TIOCLBIC:
799                 case TIOCLSET:
800 #endif
801                         pti->pt_send |= TIOCPKT_IOCTL;
802                         ptcwakeup(tp, FREAD);
803                 default:
804                         break;
805                 }
806         }
807         stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
808                 && CCEQ(cc[VSTART], CTRL('q'));
809         if (pti->pt_flags & PF_NOSTOP) {
810                 if (stop) {
811                         pti->pt_send &= ~TIOCPKT_NOSTOP;
812                         pti->pt_send |= TIOCPKT_DOSTOP;
813                         pti->pt_flags &= ~PF_NOSTOP;
814                         ptcwakeup(tp, FREAD);
815                 }
816         } else {
817                 if (!stop) {
818                         pti->pt_send &= ~TIOCPKT_DOSTOP;
819                         pti->pt_send |= TIOCPKT_NOSTOP;
820                         pti->pt_flags |= PF_NOSTOP;
821                         ptcwakeup(tp, FREAD);
822                 }
823         }
824         return (error);
825 }
826
827
828 static void ptc_drvinit __P((void *unused));
829
830 static void
831 ptc_drvinit(unused)
832         void *unused;
833 {
834         cdevsw_add(&pts_cdevsw);
835         cdevsw_add(&ptc_cdevsw);
836         /* XXX: Gross hack for DEVFS */
837         /* XXX: DEVFS is no more, should this be removed? */
838         ptyinit(0);
839 }
840
841 SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)