sys/kern/tty.c

   1 /*-
   2  * Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Portions of this software were developed under sponsorship from Snow
   6  * B.V., the Netherlands.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD$");
  32
  33 #include "opt_compat.h"
  34
  35 #include <sys/param.h>
  36 #include <sys/conf.h>
  37 #include <sys/cons.h>
  38 #include <sys/fcntl.h>
  39 #include <sys/file.h>
  40 #include <sys/filedesc.h>
  41 #include <sys/filio.h>
  42 #ifdef COMPAT_43TTY
  43 #include <sys/ioctl_compat.h>
  44 #endif /* COMPAT_43TTY */
  45 #include <sys/kernel.h>
  46 #include <sys/limits.h>
  47 #include <sys/malloc.h>
  48 #include <sys/mount.h>
  49 #include <sys/poll.h>
  50 #include <sys/priv.h>
  51 #include <sys/proc.h>
  52 #include <sys/serial.h>
  53 #include <sys/signal.h>
  54 #include <sys/stat.h>
  55 #include <sys/sx.h>
  56 #include <sys/sysctl.h>
  57 #include <sys/systm.h>
  58 #include <sys/tty.h>
  59 #include <sys/ttycom.h>
  60 #define TTYDEFCHARS
  61 #include <sys/ttydefaults.h>
  62 #undef TTYDEFCHARS
  63 #include <sys/ucred.h>
  64 #include <sys/vnode.h>
  65
  66 #include <machine/stdarg.h>
  67
  68 static MALLOC_DEFINE(M_TTY, "tty", "tty device");
  69
  70 static void tty_rel_free(struct tty *tp);
  71
  72 static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list);
  73 static struct sx tty_list_sx;
  74 SX_SYSINIT(tty_list, &tty_list_sx, "tty list");
  75 static unsigned int tty_list_count = 0;
  76
  77 /* Character device of /dev/console. */
  78 static struct cdev      *dev_console;
  79 static const char       *dev_console_filename;
  80
  81 /*
  82  * Flags that are supported and stored by this implementation.
  83  */
  84 #define TTYSUP_IFLAG    (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK|ISTRIP|\
  85                         INLCR|IGNCR|ICRNL|IXON|IXOFF|IXANY|IMAXBEL)
  86 #define TTYSUP_OFLAG    (OPOST|ONLCR|TAB3|ONOEOT|OCRNL|ONOCR|ONLRET)
  87 #define TTYSUP_LFLAG    (ECHOKE|ECHOE|ECHOK|ECHO|ECHONL|ECHOPRT|\
  88                         ECHOCTL|ISIG|ICANON|ALTWERASE|IEXTEN|TOSTOP|\
  89                         FLUSHO|NOKERNINFO|NOFLSH)
  90 #define TTYSUP_CFLAG    (CIGNORE|CSIZE|CSTOPB|CREAD|PARENB|PARODD|\
  91                         HUPCL|CLOCAL|CCTS_OFLOW|CRTS_IFLOW|CDTR_IFLOW|\
  92                         CDSR_OFLOW|CCAR_OFLOW)
  93
  94 #define TTY_CALLOUT(tp,d) ((d) != (tp)->t_dev && (d) != dev_console)
  95
  96 /*
  97  * Set TTY buffer sizes.
  98  */
  99
 100 #define TTYBUF_MAX      65536
 101
 102 static void
 103 tty_watermarks(struct tty *tp)
 104 {
 105         size_t bs;
 106
 107         /* Provide an input buffer for 0.2 seconds of data. */
 108         bs = MIN(tp->t_termios.c_ispeed / 5, TTYBUF_MAX);
 109         ttyinq_setsize(&tp->t_inq, tp, bs);
 110
 111         /* Set low watermark at 10% (when 90% is available). */
 112         tp->t_inlow = (ttyinq_getallocatedsize(&tp->t_inq) * 9) / 10;
 113
 114         /* Provide an ouput buffer for 0.2 seconds of data. */
 115         bs = MIN(tp->t_termios.c_ospeed / 5, TTYBUF_MAX);
 116         ttyoutq_setsize(&tp->t_outq, tp, bs);
 117
 118         /* Set low watermark at 10% (when 90% is available). */
 119         tp->t_outlow = (ttyoutq_getallocatedsize(&tp->t_outq) * 9) / 10;
 120 }
 121
 122 static int
 123 tty_drain(struct tty *tp)
 124 {
 125         int error;
 126
 127         if (ttyhook_hashook(tp, getc_inject))
 128                 /* buffer is inaccessible */
 129                 return (0);
 130
 131         while (ttyoutq_bytesused(&tp->t_outq) > 0) {
 132                 ttydevsw_outwakeup(tp);
 133                 /* Could be handled synchronously. */
 134                 if (ttyoutq_bytesused(&tp->t_outq) == 0)
 135                         return (0);
 136
 137                 /* Wait for data to be drained. */
 138                 error = tty_wait(tp, &tp->t_outwait);
 139                 if (error)
 140                         return (error);
 141         }
 142
 143         return (0);
 144 }
 145
 146 /*
 147  * Though ttydev_enter() and ttydev_leave() seem to be related, they
 148  * don't have to be used together. ttydev_enter() is used by the cdev
 149  * operations to prevent an actual operation from being processed when
 150  * the TTY has been abandoned. ttydev_leave() is used by ttydev_open()
 151  * and ttydev_close() to determine whether per-TTY data should be
 152  * deallocated.
 153  */
 154
 155 static __inline int
 156 ttydev_enter(struct tty *tp)
 157 {
 158         tty_lock(tp);
 159
 160         if (tty_gone(tp) || !tty_opened(tp)) {
 161                 /* Device is already gone. */
 162                 tty_unlock(tp);
 163                 return (ENXIO);
 164         }
 165
 166         return (0);
 167 }
 168
 169 static void
 170 ttydev_leave(struct tty *tp)
 171 {
 172         tty_lock_assert(tp, MA_OWNED);
 173
 174         if (tty_opened(tp) || tp->t_flags & TF_OPENCLOSE) {
 175                 /* Device is still opened somewhere. */
 176                 tty_unlock(tp);
 177                 return;
 178         }
 179
 180         tp->t_flags |= TF_OPENCLOSE;
 181
 182         /* Stop asynchronous I/O. */
 183         funsetown(&tp->t_sigio);
 184
 185         /* Remove console TTY. */
 186         if (constty == tp)
 187                 constty_clear();
 188
 189         /* Drain any output. */
 190         MPASS((tp->t_flags & TF_STOPPED) == 0);
 191         if (!tty_gone(tp))
 192                 tty_drain(tp);
 193
 194         ttydisc_close(tp);
 195
 196         /* Destroy associated buffers already. */
 197         ttyinq_free(&tp->t_inq);
 198         tp->t_inlow = 0;
 199         ttyoutq_free(&tp->t_outq);
 200         tp->t_outlow = 0;
 201
 202         knlist_clear(&tp->t_inpoll.si_note, 1);
 203         knlist_clear(&tp->t_outpoll.si_note, 1);
 204
 205         if (!tty_gone(tp))
 206                 ttydevsw_close(tp);
 207
 208         tp->t_flags &= ~TF_OPENCLOSE;
 209         cv_broadcast(&tp->t_dcdwait);
 210         tty_rel_free(tp);
 211 }
 212
 213 /*
 214  * Operations that are exposed through the character device in /dev.
 215  */
 216 static int
 217 ttydev_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
 218 {
 219         struct tty *tp = dev->si_drv1;
 220         int error = 0;
 221
 222         tty_lock(tp);
 223         if (tty_gone(tp)) {
 224                 /* Device is already gone. */
 225                 tty_unlock(tp);
 226                 return (ENXIO);
 227         }
 228
 229         /*
 230          * Block when other processes are currently opening or closing
 231          * the TTY.
 232          */
 233         while (tp->t_flags & TF_OPENCLOSE) {
 234                 error = tty_wait(tp, &tp->t_dcdwait);
 235                 if (error != 0) {
 236                         tty_unlock(tp);
 237                         return (error);
 238                 }
 239         }
 240         tp->t_flags |= TF_OPENCLOSE;
 241
 242         /*
 243          * Make sure the "tty" and "cua" device cannot be opened at the
 244          * same time.
 245          */
 246         if (TTY_CALLOUT(tp, dev)) {
 247                 if (tp->t_flags & TF_OPENED_IN) {
 248                         error = EBUSY;
 249                         goto done;
 250                 }
 251         } else {
 252                 if (tp->t_flags & TF_OPENED_OUT) {
 253                         error = EBUSY;
 254                         goto done;
 255                 }
 256         }
 257
 258         if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) {
 259                 error = EBUSY;
 260                 goto done;
 261         }
 262
 263         if (!tty_opened(tp)) {
 264                 /* Set proper termios flags. */
 265                 if (TTY_CALLOUT(tp, dev)) {
 266                         tp->t_termios = tp->t_termios_init_out;
 267                 } else {
 268                         tp->t_termios = tp->t_termios_init_in;
 269                 }
 270                 ttydevsw_param(tp, &tp->t_termios);
 271
 272                 ttydevsw_modem(tp, SER_DTR|SER_RTS, 0);
 273
 274                 error = ttydevsw_open(tp);
 275                 if (error != 0)
 276                         goto done;
 277
 278                 ttydisc_open(tp);
 279                 tty_watermarks(tp);
 280         }
 281
 282         /* Wait for Carrier Detect. */
 283         if (!TTY_CALLOUT(tp, dev) && (oflags & O_NONBLOCK) == 0 &&
 284             (tp->t_termios.c_cflag & CLOCAL) == 0) {
 285                 while ((ttydevsw_modem(tp, 0, 0) & SER_DCD) == 0) {
 286                         error = tty_wait(tp, &tp->t_dcdwait);
 287                         if (error != 0)
 288                                 goto done;
 289                 }
 290         }
 291
 292         if (dev == dev_console)
 293                 tp->t_flags |= TF_OPENED_CONS;
 294         else if (TTY_CALLOUT(tp, dev))
 295                 tp->t_flags |= TF_OPENED_OUT;
 296         else
 297                 tp->t_flags |= TF_OPENED_IN;
 298
 299 done:   tp->t_flags &= ~TF_OPENCLOSE;
 300         cv_broadcast(&tp->t_dcdwait);
 301         ttydev_leave(tp);
 302
 303         return (error);
 304 }
 305
 306 static int
 307 ttydev_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
 308 {
 309         struct tty *tp = dev->si_drv1;
 310
 311         tty_lock(tp);
 312
 313         /*
 314          * Don't actually close the device if it is being used as the
 315          * console.
 316          */
 317         MPASS((tp->t_flags & TF_OPENED) != TF_OPENED);
 318         if (dev == dev_console)
 319                 tp->t_flags &= ~TF_OPENED_CONS;
 320         else
 321                 tp->t_flags &= ~(TF_OPENED_IN|TF_OPENED_OUT);
 322
 323         if (tp->t_flags & TF_OPENED) {
 324                 tty_unlock(tp);
 325                 return (0);
 326         }
 327
 328         /*
 329          * This can only be called once. The callin and the callout
 330          * devices cannot be opened at the same time.
 331          */
 332         tp->t_flags &= ~(TF_EXCLUDE|TF_STOPPED);
 333
 334         /* Properly wake up threads that are stuck - revoke(). */
 335         tp->t_revokecnt++;
 336         tty_wakeup(tp, FREAD|FWRITE);
 337         cv_broadcast(&tp->t_bgwait);
 338         cv_broadcast(&tp->t_dcdwait);
 339
 340         ttydev_leave(tp);
 341
 342         return (0);
 343 }
 344
 345 static __inline int
 346 tty_is_ctty(struct tty *tp, struct proc *p)
 347 {
 348         tty_lock_assert(tp, MA_OWNED);
 349
 350         return (p->p_session == tp->t_session && p->p_flag & P_CONTROLT);
 351 }
 352
 353 static int
 354 tty_wait_background(struct tty *tp, struct thread *td, int sig)
 355 {
 356         struct proc *p = td->td_proc;
 357         struct pgrp *pg;
 358         ksiginfo_t ksi;
 359         int error;
 360
 361         MPASS(sig == SIGTTIN || sig == SIGTTOU);
 362         tty_lock_assert(tp, MA_OWNED);
 363
 364         for (;;) {
 365                 PROC_LOCK(p);
 366                 /*
 367                  * The process should only sleep, when:
 368                  * - This terminal is the controling terminal
 369                  * - Its process group is not the foreground process
 370                  *   group
 371                  * - The parent process isn't waiting for the child to
 372                  *   exit
 373                  * - the signal to send to the process isn't masked
 374                  */
 375                 if (!tty_is_ctty(tp, p) || p->p_pgrp == tp->t_pgrp) {
 376                         /* Allow the action to happen. */
 377                         PROC_UNLOCK(p);
 378                         return (0);
 379                 }
 380
 381                 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, sig) ||
 382                     SIGISMEMBER(td->td_sigmask, sig)) {
 383                         /* Only allow them in write()/ioctl(). */
 384                         PROC_UNLOCK(p);
 385                         return (sig == SIGTTOU ? 0 : EIO);
 386                 }
 387
 388                 pg = p->p_pgrp;
 389                 if (p->p_flag & P_PPWAIT || pg->pg_jobc == 0) {
 390                         /* Don't allow the action to happen. */
 391                         PROC_UNLOCK(p);
 392                         return (EIO);
 393                 }
 394                 PROC_UNLOCK(p);
 395
 396                 /*
 397                  * Send the signal and sleep until we're the new
 398                  * foreground process group.
 399                  */
 400                 if (sig != 0) {
 401                         ksiginfo_init(&ksi);
 402                         ksi.ksi_code = SI_KERNEL;
 403                         ksi.ksi_signo = sig;
 404                         sig = 0;
 405                 }
 406                 PGRP_LOCK(pg);
 407                 pgsignal(pg, ksi.ksi_signo, 1, &ksi);
 408                 PGRP_UNLOCK(pg);
 409
 410                 error = tty_wait(tp, &tp->t_bgwait);
 411                 if (error)
 412                         return (error);
 413         }
 414 }
 415
 416 static int
 417 ttydev_read(struct cdev *dev, struct uio *uio, int ioflag)
 418 {
 419         struct tty *tp = dev->si_drv1;
 420         int error;
 421
 422         error = ttydev_enter(tp);
 423         if (error)
 424                 goto done;
 425
 426         error = tty_wait_background(tp, curthread, SIGTTIN);
 427         if (error) {
 428                 tty_unlock(tp);
 429                 goto done;
 430         }
 431
 432         error = ttydisc_read(tp, uio, ioflag);
 433         tty_unlock(tp);
 434
 435         /*
 436          * The read() call should not throw an error when the device is
 437          * being destroyed. Silently convert it to an EOF.
 438          */
 439 done:   if (error == ENXIO)
 440                 error = 0;
 441         return (error);
 442 }
 443
 444 static int
 445 ttydev_write(struct cdev *dev, struct uio *uio, int ioflag)
 446 {
 447         struct tty *tp = dev->si_drv1;
 448         int error;
 449
 450         error = ttydev_enter(tp);
 451         if (error)
 452                 return (error);
 453
 454         if (tp->t_termios.c_lflag & TOSTOP) {
 455                 error = tty_wait_background(tp, curthread, SIGTTOU);
 456                 if (error)
 457                         goto done;
 458         }
 459
 460         if (ioflag & IO_NDELAY && tp->t_flags & TF_BUSY_OUT) {
 461                 /* Allow non-blocking writes to bypass serialization. */
 462                 error = ttydisc_write(tp, uio, ioflag);
 463         } else {
 464                 /* Serialize write() calls. */
 465                 while (tp->t_flags & TF_BUSY_OUT) {
 466                         error = tty_wait(tp, &tp->t_outserwait);
 467                         if (error)
 468                                 goto done;
 469                 }
 470
 471                 tp->t_flags |= TF_BUSY_OUT;
 472                 error = ttydisc_write(tp, uio, ioflag);
 473                 tp->t_flags &= ~TF_BUSY_OUT;
 474                 cv_signal(&tp->t_outserwait);
 475         }
 476
 477 done:   tty_unlock(tp);
 478         return (error);
 479 }
 480
 481 static int
 482 ttydev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
 483     struct thread *td)
 484 {
 485         struct tty *tp = dev->si_drv1;
 486         int error;
 487
 488         error = ttydev_enter(tp);
 489         if (error)
 490                 return (error);
 491
 492         switch (cmd) {
 493         case TIOCCBRK:
 494         case TIOCCONS:
 495         case TIOCDRAIN:
 496         case TIOCEXCL:
 497         case TIOCFLUSH:
 498         case TIOCNXCL:
 499         case TIOCSBRK:
 500         case TIOCSCTTY:
 501         case TIOCSETA:
 502         case TIOCSETAF:
 503         case TIOCSETAW:
 504         case TIOCSPGRP:
 505         case TIOCSTART:
 506         case TIOCSTAT:
 507         case TIOCSTI:
 508         case TIOCSTOP:
 509         case TIOCSWINSZ:
 510 #if 0
 511         case TIOCSDRAINWAIT:
 512         case TIOCSETD:
 513 #endif
 514 #ifdef COMPAT_43TTY
 515         case  TIOCLBIC:
 516         case  TIOCLBIS:
 517         case  TIOCLSET:
 518         case  TIOCSETC:
 519         case OTIOCSETD:
 520         case  TIOCSETN:
 521         case  TIOCSETP:
 522         case  TIOCSLTC:
 523 #endif /* COMPAT_43TTY */
 524                 /*
 525                  * If the ioctl() causes the TTY to be modified, let it
 526                  * wait in the background.
 527                  */
 528                 error = tty_wait_background(tp, curthread, SIGTTOU);
 529                 if (error)
 530                         goto done;
 531         }
 532
 533         if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) {
 534                 struct termios *old = &tp->t_termios;
 535                 struct termios *new = (struct termios *)data;
 536                 struct termios *lock = TTY_CALLOUT(tp, dev) ?
 537                     &tp->t_termios_lock_out : &tp->t_termios_lock_in;
 538                 int cc;
 539
 540                 /*
 541                  * Lock state devices.  Just overwrite the values of the
 542                  * commands that are currently in use.
 543                  */
 544                 new->c_iflag = (old->c_iflag & lock->c_iflag) |
 545                     (new->c_iflag & ~lock->c_iflag);
 546                 new->c_oflag = (old->c_oflag & lock->c_oflag) |
 547                     (new->c_oflag & ~lock->c_oflag);
 548                 new->c_cflag = (old->c_cflag & lock->c_cflag) |
 549                     (new->c_cflag & ~lock->c_cflag);
 550                 new->c_lflag = (old->c_lflag & lock->c_lflag) |
 551                     (new->c_lflag & ~lock->c_lflag);
 552                 for (cc = 0; cc < NCCS; ++cc)
 553                         if (lock->c_cc[cc])
 554                                 new->c_cc[cc] = old->c_cc[cc];
 555                 if (lock->c_ispeed)
 556                         new->c_ispeed = old->c_ispeed;
 557                 if (lock->c_ospeed)
 558                         new->c_ospeed = old->c_ospeed;
 559         }
 560
 561         error = tty_ioctl(tp, cmd, data, fflag, td);
 562 done:   tty_unlock(tp);
 563
 564         return (error);
 565 }
 566
 567 static int
 568 ttydev_poll(struct cdev *dev, int events, struct thread *td)
 569 {
 570         struct tty *tp = dev->si_drv1;
 571         int error, revents = 0;
 572
 573         error = ttydev_enter(tp);
 574         if (error)
 575                 return ((events & (POLLIN|POLLRDNORM)) | POLLHUP);
 576
 577         if (events & (POLLIN|POLLRDNORM)) {
 578                 /* See if we can read something. */
 579                 if (ttydisc_read_poll(tp) > 0)
 580                         revents |= events & (POLLIN|POLLRDNORM);
 581         }
 582
 583         if (tp->t_flags & TF_ZOMBIE) {
 584                 /* Hangup flag on zombie state. */
 585                 revents |= POLLHUP;
 586         } else if (events & (POLLOUT|POLLWRNORM)) {
 587                 /* See if we can write something. */
 588                 if (ttydisc_write_poll(tp) > 0)
 589                         revents |= events & (POLLOUT|POLLWRNORM);
 590         }
 591
 592         if (revents == 0) {
 593                 if (events & (POLLIN|POLLRDNORM))
 594                         selrecord(td, &tp->t_inpoll);
 595                 if (events & (POLLOUT|POLLWRNORM))
 596                         selrecord(td, &tp->t_outpoll);
 597         }
 598
 599         tty_unlock(tp);
 600
 601         return (revents);
 602 }
 603
 604 static int
 605 ttydev_mmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot)
 606 {
 607         struct tty *tp = dev->si_drv1;
 608         int error;
 609
 610         /* Handle mmap() through the driver. */
 611
 612         error = ttydev_enter(tp);
 613         if (error)
 614                 return (-1);
 615         error = ttydevsw_mmap(tp, offset, paddr, nprot);
 616         tty_unlock(tp);
 617
 618         return (error);
 619 }
 620
 621 /*
 622  * kqueue support.
 623  */
 624
 625 static void
 626 tty_kqops_read_detach(struct knote *kn)
 627 {
 628         struct tty *tp = kn->kn_hook;
 629
 630         knlist_remove(&tp->t_inpoll.si_note, kn, 0);
 631 }
 632
 633 static int
 634 tty_kqops_read_event(struct knote *kn, long hint)
 635 {
 636         struct tty *tp = kn->kn_hook;
 637
 638         tty_lock_assert(tp, MA_OWNED);
 639
 640         if (tty_gone(tp) || tp->t_flags & TF_ZOMBIE) {
 641                 kn->kn_flags |= EV_EOF;
 642                 return (1);
 643         } else {
 644                 kn->kn_data = ttydisc_read_poll(tp);
 645                 return (kn->kn_data > 0);
 646         }
 647 }
 648
 649 static void
 650 tty_kqops_write_detach(struct knote *kn)
 651 {
 652         struct tty *tp = kn->kn_hook;
 653
 654         knlist_remove(&tp->t_outpoll.si_note, kn, 0);
 655 }
 656
 657 static int
 658 tty_kqops_write_event(struct knote *kn, long hint)
 659 {
 660         struct tty *tp = kn->kn_hook;
 661
 662         tty_lock_assert(tp, MA_OWNED);
 663
 664         if (tty_gone(tp)) {
 665                 kn->kn_flags |= EV_EOF;
 666                 return (1);
 667         } else {
 668                 kn->kn_data = ttydisc_write_poll(tp);
 669                 return (kn->kn_data > 0);
 670         }
 671 }
 672
 673 static struct filterops tty_kqops_read =
 674     { 1, NULL, tty_kqops_read_detach, tty_kqops_read_event };
 675 static struct filterops tty_kqops_write =
 676     { 1, NULL, tty_kqops_write_detach, tty_kqops_write_event };
 677
 678 static int
 679 ttydev_kqfilter(struct cdev *dev, struct knote *kn)
 680 {
 681         struct tty *tp = dev->si_drv1;
 682         int error;
 683
 684         error = ttydev_enter(tp);
 685         if (error)
 686                 return (error);
 687
 688         switch (kn->kn_filter) {
 689         case EVFILT_READ:
 690                 kn->kn_hook = tp;
 691                 kn->kn_fop = &tty_kqops_read;
 692                 knlist_add(&tp->t_inpoll.si_note, kn, 1);
 693                 break;
 694         case EVFILT_WRITE:
 695                 kn->kn_hook = tp;
 696                 kn->kn_fop = &tty_kqops_write;
 697                 knlist_add(&tp->t_outpoll.si_note, kn, 1);
 698                 break;
 699         default:
 700                 error = EINVAL;
 701                 break;
 702         }
 703
 704         tty_unlock(tp);
 705         return (error);
 706 }
 707
 708 static struct cdevsw ttydev_cdevsw = {
 709         .d_version      = D_VERSION,
 710         .d_open         = ttydev_open,
 711         .d_close        = ttydev_close,
 712         .d_read         = ttydev_read,
 713         .d_write        = ttydev_write,
 714         .d_ioctl        = ttydev_ioctl,
 715         .d_kqfilter     = ttydev_kqfilter,
 716         .d_poll         = ttydev_poll,
 717         .d_mmap         = ttydev_mmap,
 718         .d_name         = "ttydev",
 719         .d_flags        = D_TTY,
 720 };
 721
 722 /*
 723  * Init/lock-state devices
 724  */
 725
 726 static int
 727 ttyil_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
 728 {
 729         struct tty *tp = dev->si_drv1;
 730         int error = 0;
 731
 732         tty_lock(tp);
 733         if (tty_gone(tp))
 734                 error = ENODEV;
 735         tty_unlock(tp);
 736
 737         return (error);
 738 }
 739
 740 static int
 741 ttyil_close(struct cdev *dev, int flag, int mode, struct thread *td)
 742 {
 743         return (0);
 744 }
 745
 746 static int
 747 ttyil_rdwr(struct cdev *dev, struct uio *uio, int ioflag)
 748 {
 749         return (ENODEV);
 750 }
 751
 752 static int
 753 ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
 754     struct thread *td)
 755 {
 756         struct tty *tp = dev->si_drv1;
 757         int error = 0;
 758
 759         tty_lock(tp);
 760         if (tty_gone(tp)) {
 761                 error = ENODEV;
 762                 goto done;
 763         }
 764
 765         switch (cmd) {
 766         case TIOCGETA:
 767                 /* Obtain terminal flags through tcgetattr(). */
 768                 *(struct termios*)data = *(struct termios*)dev->si_drv2;
 769                 break;
 770         case TIOCSETA:
 771                 /* Set terminal flags through tcsetattr(). */
 772                 error = priv_check(td, PRIV_TTY_SETA);
 773                 if (error)
 774                         break;
 775                 *(struct termios*)dev->si_drv2 = *(struct termios*)data;
 776                 break;
 777         case TIOCGETD:
 778                 *(int *)data = TTYDISC;
 779                 break;
 780         case TIOCGWINSZ:
 781                 bzero(data, sizeof(struct winsize));
 782                 break;
 783         default:
 784                 error = ENOTTY;
 785         }
 786
 787 done:   tty_unlock(tp);
 788         return (error);
 789 }
 790
 791 static struct cdevsw ttyil_cdevsw = {
 792         .d_version      = D_VERSION,
 793         .d_open         = ttyil_open,
 794         .d_close        = ttyil_close,
 795         .d_read         = ttyil_rdwr,
 796         .d_write        = ttyil_rdwr,
 797         .d_ioctl        = ttyil_ioctl,
 798         .d_name         = "ttyil",
 799         .d_flags        = D_TTY,
 800 };
 801
 802 static void
 803 tty_init_termios(struct tty *tp)
 804 {
 805         struct termios *t = &tp->t_termios_init_in;
 806
 807         t->c_cflag = TTYDEF_CFLAG;
 808         t->c_iflag = TTYDEF_IFLAG;
 809         t->c_lflag = TTYDEF_LFLAG;
 810         t->c_oflag = TTYDEF_OFLAG;
 811         t->c_ispeed = TTYDEF_SPEED;
 812         t->c_ospeed = TTYDEF_SPEED;
 813         memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars);
 814
 815         tp->t_termios_init_out = *t;
 816 }
 817
 818 void
 819 tty_init_console(struct tty *tp, speed_t s)
 820 {
 821         struct termios *ti = &tp->t_termios_init_in;
 822         struct termios *to = &tp->t_termios_init_out;
 823
 824         if (s != 0) {
 825                 ti->c_ispeed = ti->c_ospeed = s;
 826                 to->c_ispeed = to->c_ospeed = s;
 827         }
 828
 829         ti->c_cflag |= CLOCAL;
 830         to->c_cflag |= CLOCAL;
 831 }
 832
 833 /*
 834  * Standard device routine implementations, mostly meant for
 835  * pseudo-terminal device drivers. When a driver creates a new terminal
 836  * device class, missing routines are patched.
 837  */
 838
 839 static int
 840 ttydevsw_defopen(struct tty *tp)
 841 {
 842
 843         return (0);
 844 }
 845
 846 static void
 847 ttydevsw_defclose(struct tty *tp)
 848 {
 849 }
 850
 851 static void
 852 ttydevsw_defoutwakeup(struct tty *tp)
 853 {
 854
 855         panic("Terminal device has output, while not implemented");
 856 }
 857
 858 static void
 859 ttydevsw_definwakeup(struct tty *tp)
 860 {
 861 }
 862
 863 static int
 864 ttydevsw_defioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td)
 865 {
 866
 867         return (ENOIOCTL);
 868 }
 869
 870 static int
 871 ttydevsw_defparam(struct tty *tp, struct termios *t)
 872 {
 873
 874         /* Use a fake baud rate, we're not a real device. */
 875         t->c_ispeed = t->c_ospeed = TTYDEF_SPEED;
 876
 877         return (0);
 878 }
 879
 880 static int
 881 ttydevsw_defmodem(struct tty *tp, int sigon, int sigoff)
 882 {
 883
 884         /* Simulate a carrier to make the TTY layer happy. */
 885         return (SER_DCD);
 886 }
 887
 888 static int
 889 ttydevsw_defmmap(struct tty *tp, vm_offset_t offset, vm_paddr_t *paddr,
 890     int nprot)
 891 {
 892
 893         return (-1);
 894 }
 895
 896 static void
 897 ttydevsw_defpktnotify(struct tty *tp, char event)
 898 {
 899 }
 900
 901 static void
 902 ttydevsw_deffree(void *softc)
 903 {
 904
 905         panic("Terminal device freed without a free-handler");
 906 }
 907
 908 /*
 909  * TTY allocation and deallocation. TTY devices can be deallocated when
 910  * the driver doesn't use it anymore, when the TTY isn't a session's
 911  * controlling TTY and when the device node isn't opened through devfs.
 912  */
 913
 914 struct tty *
 915 tty_alloc(struct ttydevsw *tsw, void *sc)
 916 {
 917
 918         return (tty_alloc_mutex(tsw, sc, NULL));
 919 }
 920
 921 struct tty *
 922 tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex)
 923 {
 924         struct tty *tp;
 925
 926         /* Make sure the driver defines all routines. */
 927 #define PATCH_FUNC(x) do {                              \
 928         if (tsw->tsw_ ## x == NULL)                     \
 929                 tsw->tsw_ ## x = ttydevsw_def ## x;     \
 930 } while (0)
 931         PATCH_FUNC(open);
 932         PATCH_FUNC(close);
 933         PATCH_FUNC(outwakeup);
 934         PATCH_FUNC(inwakeup);
 935         PATCH_FUNC(ioctl);
 936         PATCH_FUNC(param);
 937         PATCH_FUNC(modem);
 938         PATCH_FUNC(mmap);
 939         PATCH_FUNC(pktnotify);
 940         PATCH_FUNC(free);
 941 #undef PATCH_FUNC
 942
 943         tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO);
 944         tp->t_devsw = tsw;
 945         tp->t_devswsoftc = sc;
 946         tp->t_flags = tsw->tsw_flags;
 947
 948         tty_init_termios(tp);
 949
 950         cv_init(&tp->t_inwait, "ttyin");
 951         cv_init(&tp->t_outwait, "ttyout");
 952         cv_init(&tp->t_outserwait, "ttyosr");
 953         cv_init(&tp->t_bgwait, "ttybg");
 954         cv_init(&tp->t_dcdwait, "ttydcd");
 955
 956         /* Allow drivers to use a custom mutex to lock the TTY. */
 957         if (mutex != NULL) {
 958                 tp->t_mtx = mutex;
 959         } else {
 960                 tp->t_mtx = &tp->t_mtxobj;
 961                 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF);
 962         }
 963
 964         knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx);
 965         knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx);
 966
 967         sx_xlock(&tty_list_sx);
 968         TAILQ_INSERT_TAIL(&tty_list, tp, t_list);
 969         tty_list_count++;
 970         sx_xunlock(&tty_list_sx);
 971
 972         return (tp);
 973 }
 974
 975 static void
 976 tty_dealloc(void *arg)
 977 {
 978         struct tty *tp = arg;
 979
 980         sx_xlock(&tty_list_sx);
 981         TAILQ_REMOVE(&tty_list, tp, t_list);
 982         tty_list_count--;
 983         sx_xunlock(&tty_list_sx);
 984
 985         /* Make sure we haven't leaked buffers. */
 986         MPASS(ttyinq_getsize(&tp->t_inq) == 0);
 987         MPASS(ttyoutq_getsize(&tp->t_outq) == 0);
 988
 989         seldrain(&tp->t_inpoll);
 990         seldrain(&tp->t_outpoll);
 991         knlist_destroy(&tp->t_inpoll.si_note);
 992         knlist_destroy(&tp->t_outpoll.si_note);
 993
 994         cv_destroy(&tp->t_inwait);
 995         cv_destroy(&tp->t_outwait);
 996         cv_destroy(&tp->t_bgwait);
 997         cv_destroy(&tp->t_dcdwait);
 998         cv_destroy(&tp->t_outserwait);
 999
1000         if (tp->t_mtx == &tp->t_mtxobj)
1001                 mtx_destroy(&tp->t_mtxobj);
1002         ttydevsw_free(tp);
1003         free(tp, M_TTY);
1004 }
1005
1006 static void
1007 tty_rel_free(struct tty *tp)
1008 {
1009         struct cdev *dev;
1010
1011         tty_lock_assert(tp, MA_OWNED);
1012
1013 #define TF_ACTIVITY     (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE)
1014         if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) {
1015                 /* TTY is still in use. */
1016                 tty_unlock(tp);
1017                 return;
1018         }
1019
1020         /* TTY can be deallocated. */
1021         dev = tp->t_dev;
1022         tp->t_dev = NULL;
1023         tty_unlock(tp);
1024
1025         if (dev != NULL)
1026                 destroy_dev_sched_cb(dev, tty_dealloc, tp);
1027 }
1028
1029 void
1030 tty_rel_pgrp(struct tty *tp, struct pgrp *pg)
1031 {
1032         MPASS(tp->t_sessioncnt > 0);
1033         tty_lock_assert(tp, MA_OWNED);
1034
1035         if (tp->t_pgrp == pg)
1036                 tp->t_pgrp = NULL;
1037
1038         tty_unlock(tp);
1039 }
1040
1041 void
1042 tty_rel_sess(struct tty *tp, struct session *sess)
1043 {
1044         MPASS(tp->t_sessioncnt > 0);
1045
1046         /* Current session has left. */
1047         if (tp->t_session == sess) {
1048                 tp->t_session = NULL;
1049                 MPASS(tp->t_pgrp == NULL);
1050         }
1051         tp->t_sessioncnt--;
1052         tty_rel_free(tp);
1053 }
1054
1055 void
1056 tty_rel_gone(struct tty *tp)
1057 {
1058         MPASS(!tty_gone(tp));
1059
1060         /* Simulate carrier removal. */
1061         ttydisc_modem(tp, 0);
1062
1063         /* Wake up all blocked threads. */
1064         tty_wakeup(tp, FREAD|FWRITE);
1065         cv_broadcast(&tp->t_bgwait);
1066         cv_broadcast(&tp->t_dcdwait);
1067
1068         tp->t_flags |= TF_GONE;
1069         tty_rel_free(tp);
1070 }
1071
1072 /*
1073  * Exposing information about current TTY's through sysctl
1074  */
1075
1076 static void
1077 tty_to_xtty(struct tty *tp, struct xtty *xt)
1078 {
1079         tty_lock_assert(tp, MA_OWNED);
1080
1081         xt->xt_size = sizeof(struct xtty);
1082         xt->xt_insize = ttyinq_getsize(&tp->t_inq);
1083         xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq);
1084         xt->xt_inlc = ttyinq_bytesline(&tp->t_inq);
1085         xt->xt_inlow = tp->t_inlow;
1086         xt->xt_outsize = ttyoutq_getsize(&tp->t_outq);
1087         xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq);
1088         xt->xt_outlow = tp->t_outlow;
1089         xt->xt_column = tp->t_column;
1090         xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
1091         xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0;
1092         xt->xt_flags = tp->t_flags;
1093         xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV;
1094 }
1095
1096 static int
1097 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
1098 {
1099         unsigned long lsize;
1100         struct xtty *xtlist, *xt;
1101         struct tty *tp;
1102         int error;
1103
1104         sx_slock(&tty_list_sx);
1105         lsize = tty_list_count * sizeof(struct xtty);
1106         if (lsize == 0) {
1107                 sx_sunlock(&tty_list_sx);
1108                 return (0);
1109         }
1110
1111         xtlist = xt = malloc(lsize, M_TTY, M_WAITOK);
1112
1113         TAILQ_FOREACH(tp, &tty_list, t_list) {
1114                 tty_lock(tp);
1115                 tty_to_xtty(tp, xt);
1116                 tty_unlock(tp);
1117                 xt++;
1118         }
1119         sx_sunlock(&tty_list_sx);
1120
1121         error = SYSCTL_OUT(req, xtlist, lsize);
1122         free(xtlist, M_TTY);
1123         return (error);
1124 }
1125
1126 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE,
1127         0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs");
1128
1129 /*
1130  * Device node creation. Device has been set up, now we can expose it to
1131  * the user.
1132  */
1133
1134 void
1135 tty_makedev(struct tty *tp, struct ucred *cred, const char *fmt, ...)
1136 {
1137         va_list ap;
1138         struct cdev *dev;
1139         const char *prefix = "tty";
1140         char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */
1141         uid_t uid;
1142         gid_t gid;
1143         mode_t mode;
1144
1145         /* Remove "tty" prefix from devices like PTY's. */
1146         if (tp->t_flags & TF_NOPREFIX)
1147                 prefix = "";
1148
1149         va_start(ap, fmt);
1150         vsnrprintf(name, sizeof name, 32, fmt, ap);
1151         va_end(ap);
1152
1153         if (cred == NULL) {
1154                 /* System device. */
1155                 uid = UID_ROOT;
1156                 gid = GID_WHEEL;
1157                 mode = S_IRUSR|S_IWUSR;
1158         } else {
1159                 /* User device. */
1160                 uid = cred->cr_ruid;
1161                 gid = GID_TTY;
1162                 mode = S_IRUSR|S_IWUSR|S_IWGRP;
1163         }
1164
1165         /* Master call-in device. */
1166         dev = make_dev_cred(&ttydev_cdevsw, 0, cred,
1167             uid, gid, mode, "%s%s", prefix, name);
1168         dev->si_drv1 = tp;
1169         tp->t_dev = dev;
1170
1171         /* Slave call-in devices. */
1172         if (tp->t_flags & TF_INITLOCK) {
1173                 dev = make_dev_cred(&ttyil_cdevsw, 0, cred,
1174                     uid, gid, mode, "%s%s.init", prefix, name);
1175                 dev_depends(tp->t_dev, dev);
1176                 dev->si_drv1 = tp;
1177                 dev->si_drv2 = &tp->t_termios_init_in;
1178
1179                 dev = make_dev_cred(&ttyil_cdevsw, 0, cred,
1180                     uid, gid, mode, "%s%s.lock", prefix, name);
1181                 dev_depends(tp->t_dev, dev);
1182                 dev->si_drv1 = tp;
1183                 dev->si_drv2 = &tp->t_termios_lock_in;
1184         }
1185
1186         /* Call-out devices. */
1187         if (tp->t_flags & TF_CALLOUT) {
1188                 dev = make_dev_cred(&ttydev_cdevsw, 0, cred,
1189                     UID_UUCP, GID_DIALER, 0660, "cua%s", name);
1190                 dev_depends(tp->t_dev, dev);
1191                 dev->si_drv1 = tp;
1192
1193                 /* Slave call-out devices. */
1194                 if (tp->t_flags & TF_INITLOCK) {
1195                         dev = make_dev_cred(&ttyil_cdevsw, 0, cred,
1196                             UID_UUCP, GID_DIALER, 0660, "cua%s.init", name);
1197                         dev_depends(tp->t_dev, dev);
1198                         dev->si_drv1 = tp;
1199                         dev->si_drv2 = &tp->t_termios_init_out;
1200
1201                         dev = make_dev_cred(&ttyil_cdevsw, 0, cred,
1202                             UID_UUCP, GID_DIALER, 0660, "cua%s.lock", name);
1203                         dev_depends(tp->t_dev, dev);
1204                         dev->si_drv1 = tp;
1205                         dev->si_drv2 = &tp->t_termios_lock_out;
1206                 }
1207         }
1208 }
1209
1210 /*
1211  * Signalling processes.
1212  */
1213
1214 void
1215 tty_signal_sessleader(struct tty *tp, int sig)
1216 {
1217         struct proc *p;
1218
1219         tty_lock_assert(tp, MA_OWNED);
1220         MPASS(sig >= 1 && sig < NSIG);
1221
1222         /* Make signals start output again. */
1223         tp->t_flags &= ~TF_STOPPED;
1224
1225         if (tp->t_session != NULL && tp->t_session->s_leader != NULL) {
1226                 p = tp->t_session->s_leader;
1227                 PROC_LOCK(p);
1228                 psignal(p, sig);
1229                 PROC_UNLOCK(p);
1230         }
1231 }
1232
1233 void
1234 tty_signal_pgrp(struct tty *tp, int sig)
1235 {
1236         ksiginfo_t ksi;
1237
1238         tty_lock_assert(tp, MA_OWNED);
1239         MPASS(sig >= 1 && sig < NSIG);
1240
1241         /* Make signals start output again. */
1242         tp->t_flags &= ~TF_STOPPED;
1243
1244         if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO))
1245                 tty_info(tp);
1246         if (tp->t_pgrp != NULL) {
1247                 ksiginfo_init(&ksi);
1248                 ksi.ksi_signo = sig;
1249                 ksi.ksi_code = SI_KERNEL;
1250                 PGRP_LOCK(tp->t_pgrp);
1251                 pgsignal(tp->t_pgrp, sig, 1, &ksi);
1252                 PGRP_UNLOCK(tp->t_pgrp);
1253         }
1254 }
1255
1256 void
1257 tty_wakeup(struct tty *tp, int flags)
1258 {
1259         if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL)
1260                 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL));
1261
1262         if (flags & FWRITE) {
1263                 cv_broadcast(&tp->t_outwait);
1264                 selwakeup(&tp->t_outpoll);
1265                 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0);
1266         }
1267         if (flags & FREAD) {
1268                 cv_broadcast(&tp->t_inwait);
1269                 selwakeup(&tp->t_inpoll);
1270                 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0);
1271         }
1272 }
1273
1274 int
1275 tty_wait(struct tty *tp, struct cv *cv)
1276 {
1277         int error;
1278         int revokecnt = tp->t_revokecnt;
1279
1280         tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED);
1281         MPASS(!tty_gone(tp));
1282
1283         error = cv_wait_sig(cv, tp->t_mtx);
1284
1285         /* Restart the system call when we may have been revoked. */
1286         if (tp->t_revokecnt != revokecnt)
1287                 return (ERESTART);
1288
1289         /* Bail out when the device slipped away. */
1290         if (tty_gone(tp))
1291                 return (ENXIO);
1292
1293         return (error);
1294 }
1295
1296 int
1297 tty_timedwait(struct tty *tp, struct cv *cv, int hz)
1298 {
1299         int error;
1300         int revokecnt = tp->t_revokecnt;
1301
1302         tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED);
1303         MPASS(!tty_gone(tp));
1304
1305         error = cv_timedwait_sig(cv, tp->t_mtx, hz);
1306
1307         /* Restart the system call when we may have been revoked. */
1308         if (tp->t_revokecnt != revokecnt)
1309                 return (ERESTART);
1310
1311         /* Bail out when the device slipped away. */
1312         if (tty_gone(tp))
1313                 return (ENXIO);
1314
1315         return (error);
1316 }
1317
1318 void
1319 tty_flush(struct tty *tp, int flags)
1320 {
1321         if (flags & FWRITE) {
1322                 tp->t_flags &= ~TF_HIWAT_OUT;
1323                 ttyoutq_flush(&tp->t_outq);
1324                 tty_wakeup(tp, FWRITE);
1325                 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE);
1326         }
1327         if (flags & FREAD) {
1328                 tty_hiwat_in_unblock(tp);
1329                 ttyinq_flush(&tp->t_inq);
1330                 ttydevsw_inwakeup(tp);
1331                 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD);
1332         }
1333 }
1334
1335 static int
1336 tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, int fflag,
1337     struct thread *td)
1338 {
1339         int error;
1340
1341         switch (cmd) {
1342         /*
1343          * Modem commands.
1344          * The SER_* and TIOCM_* flags are the same, but one bit
1345          * shifted. I don't know why.
1346          */
1347         case TIOCSDTR:
1348                 ttydevsw_modem(tp, SER_DTR, 0);
1349                 return (0);
1350         case TIOCCDTR:
1351                 ttydevsw_modem(tp, 0, SER_DTR);
1352                 return (0);
1353         case TIOCMSET: {
1354                 int bits = *(int *)data;
1355                 ttydevsw_modem(tp,
1356                     (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1,
1357                     ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1);
1358                 return (0);
1359         }
1360         case TIOCMBIS: {
1361                 int bits = *(int *)data;
1362                 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0);
1363                 return (0);
1364         }
1365         case TIOCMBIC: {
1366                 int bits = *(int *)data;
1367                 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1);
1368                 return (0);
1369         }
1370         case TIOCMGET:
1371                 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1);
1372                 return (0);
1373
1374         case FIOASYNC:
1375                 if (*(int *)data)
1376                         tp->t_flags |= TF_ASYNC;
1377                 else
1378                         tp->t_flags &= ~TF_ASYNC;
1379                 return (0);
1380         case FIONBIO:
1381                 /* This device supports non-blocking operation. */
1382                 return (0);
1383         case FIONREAD:
1384                 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq);
1385                 return (0);
1386         case FIONWRITE:
1387         case TIOCOUTQ:
1388                 *(int *)data = ttyoutq_bytesused(&tp->t_outq);
1389                 return (0);
1390         case FIOSETOWN:
1391                 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc))
1392                         /* Not allowed to set ownership. */
1393                         return (ENOTTY);
1394
1395                 /* Temporarily unlock the TTY to set ownership. */
1396                 tty_unlock(tp);
1397                 error = fsetown(*(int *)data, &tp->t_sigio);
1398                 tty_lock(tp);
1399                 return (error);
1400         case FIOGETOWN:
1401                 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc))
1402                         /* Not allowed to set ownership. */
1403                         return (ENOTTY);
1404
1405                 /* Get ownership. */
1406                 *(int *)data = fgetown(&tp->t_sigio);
1407                 return (0);
1408         case TIOCGETA:
1409                 /* Obtain terminal flags through tcgetattr(). */
1410                 *(struct termios*)data = tp->t_termios;
1411                 return (0);
1412         case TIOCSETA:
1413         case TIOCSETAW:
1414         case TIOCSETAF: {
1415                 struct termios *t = data;
1416
1417                 /*
1418                  * Who makes up these funny rules? According to POSIX,
1419                  * input baud rate is set equal to the output baud rate
1420                  * when zero.
1421                  */
1422                 if (t->c_ispeed == 0)
1423                         t->c_ispeed = t->c_ospeed;
1424
1425                 /* Discard any unsupported bits. */
1426                 t->c_iflag &= TTYSUP_IFLAG;
1427                 t->c_oflag &= TTYSUP_OFLAG;
1428                 t->c_lflag &= TTYSUP_LFLAG;
1429                 t->c_cflag &= TTYSUP_CFLAG;
1430
1431                 /* Set terminal flags through tcsetattr(). */
1432                 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
1433                         error = tty_drain(tp);
1434                         if (error)
1435                                 return (error);
1436                         if (cmd == TIOCSETAF)
1437                                 tty_flush(tp, FREAD);
1438                 }
1439
1440                 /*
1441                  * Only call param() when the flags really change.
1442                  */
1443                 if ((t->c_cflag & CIGNORE) == 0 &&
1444                     (tp->t_termios.c_cflag != t->c_cflag ||
1445                     tp->t_termios.c_ispeed != t->c_ispeed ||
1446                     tp->t_termios.c_ospeed != t->c_ospeed)) {
1447                         error = ttydevsw_param(tp, t);
1448                         if (error)
1449                                 return (error);
1450
1451                         /* XXX: CLOCAL? */
1452
1453                         tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE;
1454                         tp->t_termios.c_ispeed = t->c_ispeed;
1455                         tp->t_termios.c_ospeed = t->c_ospeed;
1456
1457                         /* Baud rate has changed - update watermarks. */
1458                         tty_watermarks(tp);
1459                 }
1460
1461                 /* Copy new non-device driver parameters. */
1462                 tp->t_termios.c_iflag = t->c_iflag;
1463                 tp->t_termios.c_oflag = t->c_oflag;
1464                 tp->t_termios.c_lflag = t->c_lflag;
1465                 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc);
1466
1467                 ttydisc_optimize(tp);
1468
1469                 if ((t->c_lflag & ICANON) == 0) {
1470                         /*
1471                          * When in non-canonical mode, wake up all
1472                          * readers. Canonicalize any partial input. VMIN
1473                          * and VTIME could also be adjusted.
1474                          */
1475                         ttyinq_canonicalize(&tp->t_inq);
1476                         tty_wakeup(tp, FREAD);
1477                 }
1478
1479                 /*
1480                  * For packet mode: notify the PTY consumer that VSTOP
1481                  * and VSTART may have been changed.
1482                  */
1483                 if (tp->t_termios.c_iflag & IXON &&
1484                     tp->t_termios.c_cc[VSTOP] == CTRL('S') &&
1485                     tp->t_termios.c_cc[VSTART] == CTRL('Q'))
1486                         ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP);
1487                 else
1488                         ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP);
1489                 return (0);
1490         }
1491         case TIOCGETD:
1492                 /* For compatibility - we only support TTYDISC. */
1493                 *(int *)data = TTYDISC;
1494                 return (0);
1495         case TIOCGPGRP:
1496                 if (!tty_is_ctty(tp, td->td_proc))
1497                         return (ENOTTY);
1498
1499                 if (tp->t_pgrp != NULL)
1500                         *(int *)data = tp->t_pgrp->pg_id;
1501                 else
1502                         *(int *)data = NO_PID;
1503                 return (0);
1504         case TIOCGSID:
1505                 if (!tty_is_ctty(tp, td->td_proc))
1506                         return (ENOTTY);
1507
1508                 MPASS(tp->t_session);
1509                 *(int *)data = tp->t_session->s_sid;
1510                 return (0);
1511         case TIOCSCTTY: {
1512                 struct proc *p = td->td_proc;
1513
1514                 /* XXX: This looks awful. */
1515                 tty_unlock(tp);
1516                 sx_xlock(&proctree_lock);
1517                 tty_lock(tp);
1518
1519                 if (!SESS_LEADER(p)) {
1520                         /* Only the session leader may do this. */
1521                         sx_xunlock(&proctree_lock);
1522                         return (EPERM);
1523                 }
1524
1525                 if (tp->t_session != NULL && tp->t_session == p->p_session) {
1526                         /* This is already our controlling TTY. */
1527                         sx_xunlock(&proctree_lock);
1528                         return (0);
1529                 }
1530
1531                 if (p->p_session->s_ttyp != NULL ||
1532                     (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL &&
1533                     tp->t_session->s_ttyvp->v_type != VBAD)) {
1534                         /*
1535                          * There is already a relation between a TTY and
1536                          * a session, or the caller is not the session
1537                          * leader.
1538                          *
1539                          * Allow the TTY to be stolen when the vnode is
1540                          * invalid, but the reference to the TTY is
1541                          * still active.  This allows immediate reuse of
1542                          * TTYs of which the session leader has been
1543                          * killed or the TTY revoked.
1544                          */
1545                         sx_xunlock(&proctree_lock);
1546                         return (EPERM);
1547                 }
1548
1549                 /* Connect the session to the TTY. */
1550                 tp->t_session = p->p_session;
1551                 tp->t_session->s_ttyp = tp;
1552                 tp->t_sessioncnt++;
1553                 sx_xunlock(&proctree_lock);
1554
1555                 /* Assign foreground process group. */
1556                 tp->t_pgrp = p->p_pgrp;
1557                 PROC_LOCK(p);
1558                 p->p_flag |= P_CONTROLT;
1559                 PROC_UNLOCK(p);
1560
1561                 return (0);
1562         }
1563         case TIOCSPGRP: {
1564                 struct pgrp *pg;
1565
1566                 /*
1567                  * XXX: Temporarily unlock the TTY to locate the process
1568                  * group. This code would be lot nicer if we would ever
1569                  * decompose proctree_lock.
1570                  */
1571                 tty_unlock(tp);
1572                 sx_slock(&proctree_lock);
1573                 pg = pgfind(*(int *)data);
1574                 if (pg != NULL)
1575                         PGRP_UNLOCK(pg);
1576                 if (pg == NULL || pg->pg_session != td->td_proc->p_session) {
1577                         sx_sunlock(&proctree_lock);
1578                         tty_lock(tp);
1579                         return (EPERM);
1580                 }
1581                 tty_lock(tp);
1582
1583                 /*
1584                  * Determine if this TTY is the controlling TTY after
1585                  * relocking the TTY.
1586                  */
1587                 if (!tty_is_ctty(tp, td->td_proc)) {
1588                         sx_sunlock(&proctree_lock);
1589                         return (ENOTTY);
1590                 }
1591                 tp->t_pgrp = pg;
1592                 sx_sunlock(&proctree_lock);
1593
1594                 /* Wake up the background process groups. */
1595                 cv_broadcast(&tp->t_bgwait);
1596                 return (0);
1597         }
1598         case TIOCFLUSH: {
1599                 int flags = *(int *)data;
1600
1601                 if (flags == 0)
1602                         flags = (FREAD|FWRITE);
1603                 else
1604                         flags &= (FREAD|FWRITE);
1605                 tty_flush(tp, flags);
1606                 return (0);
1607         }
1608         case TIOCDRAIN:
1609                 /* Drain TTY output. */
1610                 return tty_drain(tp);
1611         case TIOCCONS:
1612                 /* Set terminal as console TTY. */
1613                 if (*(int *)data) {
1614                         error = priv_check(td, PRIV_TTY_CONSOLE);
1615                         if (error)
1616                                 return (error);
1617
1618                         /*
1619                          * XXX: constty should really need to be locked!
1620                          * XXX: allow disconnected constty's to be stolen!
1621                          */
1622
1623                         if (constty == tp)
1624                                 return (0);
1625                         if (constty != NULL)
1626                                 return (EBUSY);
1627
1628                         tty_unlock(tp);
1629                         constty_set(tp);
1630                         tty_lock(tp);
1631                 } else if (constty == tp) {
1632                         constty_clear();
1633                 }
1634                 return (0);
1635         case TIOCGWINSZ:
1636                 /* Obtain window size. */
1637                 *(struct winsize*)data = tp->t_winsize;
1638                 return (0);
1639         case TIOCSWINSZ:
1640                 /* Set window size. */
1641                 if (bcmp(&tp->t_winsize, data, sizeof(struct winsize)) == 0)
1642                         return (0);
1643                 tp->t_winsize = *(struct winsize*)data;
1644                 tty_signal_pgrp(tp, SIGWINCH);
1645                 return (0);
1646         case TIOCEXCL:
1647                 tp->t_flags |= TF_EXCLUDE;
1648                 return (0);
1649         case TIOCNXCL:
1650                 tp->t_flags &= ~TF_EXCLUDE;
1651                 return (0);
1652         case TIOCSTOP:
1653                 tp->t_flags |= TF_STOPPED;
1654                 ttydevsw_pktnotify(tp, TIOCPKT_STOP);
1655                 return (0);
1656         case TIOCSTART:
1657                 tp->t_flags &= ~TF_STOPPED;
1658                 ttydevsw_outwakeup(tp);
1659                 ttydevsw_pktnotify(tp, TIOCPKT_START);
1660                 return (0);
1661         case TIOCSTAT:
1662                 tty_info(tp);
1663                 return (0);
1664         case TIOCSTI:
1665                 if ((fflag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI))
1666                         return (EPERM);
1667                 if (!tty_is_ctty(tp, td->td_proc) &&
1668                     priv_check(td, PRIV_TTY_STI))
1669                         return (EACCES);
1670                 ttydisc_rint(tp, *(char *)data, 0);
1671                 ttydisc_rint_done(tp);
1672                 return (0);
1673         }
1674
1675 #ifdef COMPAT_43TTY
1676         return tty_ioctl_compat(tp, cmd, data, fflag, td);
1677 #else /* !COMPAT_43TTY */
1678         return (ENOIOCTL);
1679 #endif /* COMPAT_43TTY */
1680 }
1681
1682 int
1683 tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, struct thread *td)
1684 {
1685         int error;
1686
1687         tty_lock_assert(tp, MA_OWNED);
1688
1689         if (tty_gone(tp))
1690                 return (ENXIO);
1691
1692         error = ttydevsw_ioctl(tp, cmd, data, td);
1693         if (error == ENOIOCTL)
1694                 error = tty_generic_ioctl(tp, cmd, data, fflag, td);
1695
1696         return (error);
1697 }
1698
1699 dev_t
1700 tty_udev(struct tty *tp)
1701 {
1702         if (tp->t_dev)
1703                 return dev2udev(tp->t_dev);
1704         else
1705                 return NODEV;
1706 }
1707
1708 int
1709 tty_checkoutq(struct tty *tp)
1710 {
1711
1712         /* 256 bytes should be enough to print a log message. */
1713         return (ttyoutq_bytesleft(&tp->t_outq) >= 256);
1714 }
1715
1716 void
1717 tty_hiwat_in_block(struct tty *tp)
1718 {
1719
1720         if ((tp->t_flags & TF_HIWAT_IN) == 0 &&
1721             tp->t_termios.c_iflag & IXOFF &&
1722             tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) {
1723                 /*
1724                  * Input flow control. Only enter the high watermark when we
1725                  * can successfully store the VSTOP character.
1726                  */
1727                 if (ttyoutq_write_nofrag(&tp->t_outq,
1728                     &tp->t_termios.c_cc[VSTOP], 1) == 0)
1729                         tp->t_flags |= TF_HIWAT_IN;
1730         } else {
1731                 /* No input flow control. */
1732                 tp->t_flags |= TF_HIWAT_IN;
1733         }
1734 }
1735
1736 void
1737 tty_hiwat_in_unblock(struct tty *tp)
1738 {
1739
1740         if (tp->t_flags & TF_HIWAT_IN &&
1741             tp->t_termios.c_iflag & IXOFF &&
1742             tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) {
1743                 /*
1744                  * Input flow control. Only leave the high watermark when we
1745                  * can successfully store the VSTART character.
1746                  */
1747                 if (ttyoutq_write_nofrag(&tp->t_outq,
1748                     &tp->t_termios.c_cc[VSTART], 1) == 0)
1749                         tp->t_flags &= ~TF_HIWAT_IN;
1750         } else {
1751                 /* No input flow control. */
1752                 tp->t_flags &= ~TF_HIWAT_IN;
1753         }
1754
1755         if (!tty_gone(tp))
1756                 ttydevsw_inwakeup(tp);
1757 }
1758
1759 /*
1760  * TTY hooks interface.
1761  */
1762
1763 static int
1764 ttyhook_defrint(struct tty *tp, char c, int flags)
1765 {
1766
1767         if (ttyhook_rint_bypass(tp, &c, 1) != 1)
1768                 return (-1);
1769
1770         return (0);
1771 }
1772
1773 int
1774 ttyhook_register(struct tty **rtp, struct proc *p, int fd,
1775     struct ttyhook *th, void *softc)
1776 {
1777         struct tty *tp;
1778         struct file *fp;
1779         struct cdev *dev;
1780         struct cdevsw *cdp;
1781         struct filedesc *fdp;
1782         int error, ref;
1783
1784         /* Validate the file descriptor. */
1785         if ((fdp = p->p_fd) == NULL)
1786                 return (EBADF);
1787
1788         fp = fget_unlocked(fdp, fd);
1789         if (fp == NULL)
1790                 return (EBADF);
1791         if (fp->f_ops == &badfileops) {
1792                 error = EBADF;
1793                 goto done1;
1794         }
1795
1796         /*
1797          * Make sure the vnode is bound to a character device.
1798          * Unlocked check for the vnode type is ok there, because we
1799          * only shall prevent calling devvn_refthread on the file that
1800          * never has been opened over a character device.
1801          */
1802         if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) {
1803                 error = EINVAL;
1804                 goto done1;
1805         }
1806
1807         /* Make sure it is a TTY. */
1808         cdp = devvn_refthread(fp->f_vnode, &dev, &ref);
1809         if (cdp == NULL) {
1810                 error = ENXIO;
1811                 goto done1;
1812         }
1813         if (dev != fp->f_data) {
1814                 error = ENXIO;
1815                 goto done2;
1816         }
1817         if (cdp != &ttydev_cdevsw) {
1818                 error = ENOTTY;
1819                 goto done2;
1820         }
1821         tp = dev->si_drv1;
1822
1823         /* Try to attach the hook to the TTY. */
1824         error = EBUSY;
1825         tty_lock(tp);
1826         MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0));
1827         if (tp->t_flags & TF_HOOK)
1828                 goto done3;
1829
1830         tp->t_flags |= TF_HOOK;
1831         tp->t_hook = th;
1832         tp->t_hooksoftc = softc;
1833         *rtp = tp;
1834         error = 0;
1835
1836         /* Maybe we can switch into bypass mode now. */
1837         ttydisc_optimize(tp);
1838
1839         /* Silently convert rint() calls to rint_bypass() when possible. */
1840         if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass))
1841                 th->th_rint = ttyhook_defrint;
1842
1843 done3:  tty_unlock(tp);
1844 done2:  dev_relthread(dev, ref);
1845 done1:  fdrop(fp, curthread);
1846         return (error);
1847 }
1848
1849 void
1850 ttyhook_unregister(struct tty *tp)
1851 {
1852
1853         tty_lock_assert(tp, MA_OWNED);
1854         MPASS(tp->t_flags & TF_HOOK);
1855
1856         /* Disconnect the hook. */
1857         tp->t_flags &= ~TF_HOOK;
1858         tp->t_hook = NULL;
1859
1860         /* Maybe we need to leave bypass mode. */
1861         ttydisc_optimize(tp);
1862
1863         /* Maybe deallocate the TTY as well. */
1864         tty_rel_free(tp);
1865 }
1866
1867 /*
1868  * /dev/console handling.
1869  */
1870
1871 static int
1872 ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
1873 {
1874         struct tty *tp;
1875
1876         /* System has no console device. */
1877         if (dev_console_filename == NULL)
1878                 return (ENXIO);
1879
1880         /* Look up corresponding TTY by device name. */
1881         sx_slock(&tty_list_sx);
1882         TAILQ_FOREACH(tp, &tty_list, t_list) {
1883                 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) {
1884                         dev_console->si_drv1 = tp;
1885                         break;
1886                 }
1887         }
1888         sx_sunlock(&tty_list_sx);
1889
1890         /* System console has no TTY associated. */
1891         if (dev_console->si_drv1 == NULL)
1892                 return (ENXIO);
1893
1894         return (ttydev_open(dev, oflags, devtype, td));
1895 }
1896
1897 static int
1898 ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag)
1899 {
1900
1901         log_console(uio);
1902
1903         return (ttydev_write(dev, uio, ioflag));
1904 }
1905
1906 /*
1907  * /dev/console is a little different than normal TTY's.  When opened,
1908  * it determines which TTY to use.  When data gets written to it, it
1909  * will be logged in the kernel message buffer.
1910  */
1911 static struct cdevsw ttyconsdev_cdevsw = {
1912         .d_version      = D_VERSION,
1913         .d_open         = ttyconsdev_open,
1914         .d_close        = ttydev_close,
1915         .d_read         = ttydev_read,
1916         .d_write        = ttyconsdev_write,
1917         .d_ioctl        = ttydev_ioctl,
1918         .d_kqfilter     = ttydev_kqfilter,
1919         .d_poll         = ttydev_poll,
1920         .d_mmap         = ttydev_mmap,
1921         .d_name         = "ttyconsdev",
1922         .d_flags        = D_TTY,
1923 };
1924
1925 static void
1926 ttyconsdev_init(void *unused)
1927 {
1928
1929         dev_console = make_dev_credf(MAKEDEV_ETERNAL, &ttyconsdev_cdevsw, 0,
1930             NULL, UID_ROOT, GID_WHEEL, 0600, "console");
1931 }
1932
1933 SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL);
1934
1935 void
1936 ttyconsdev_select(const char *name)
1937 {
1938
1939         dev_console_filename = name;
1940 }
1941
1942 /*
1943  * Debugging routines.
1944  */
1945
1946 #include "opt_ddb.h"
1947 #ifdef DDB
1948 #include <ddb/ddb.h>
1949 #include <ddb/db_sym.h>
1950
1951 static struct {
1952         int flag;
1953         char val;
1954 } ttystates[] = {
1955 #if 0
1956         { TF_NOPREFIX,          'N' },
1957 #endif
1958         { TF_INITLOCK,          'I' },
1959         { TF_CALLOUT,           'C' },
1960
1961         /* Keep these together -> 'Oi' and 'Oo'. */
1962         { TF_OPENED,            'O' },
1963         { TF_OPENED_IN,         'i' },
1964         { TF_OPENED_OUT,        'o' },
1965         { TF_OPENED_CONS,       'c' },
1966
1967         { TF_GONE,              'G' },
1968         { TF_OPENCLOSE,         'B' },
1969         { TF_ASYNC,             'Y' },
1970         { TF_LITERAL,           'L' },
1971
1972         /* Keep these together -> 'Hi' and 'Ho'. */
1973         { TF_HIWAT,             'H' },
1974         { TF_HIWAT_IN,          'i' },
1975         { TF_HIWAT_OUT,         'o' },
1976
1977         { TF_STOPPED,           'S' },
1978         { TF_EXCLUDE,           'X' },
1979         { TF_BYPASS,            'l' },
1980         { TF_ZOMBIE,            'Z' },
1981         { TF_HOOK,              's' },
1982
1983         /* Keep these together -> 'bi' and 'bo'. */
1984         { TF_BUSY,              'b' },
1985         { TF_BUSY_IN,           'i' },
1986         { TF_BUSY_OUT,          'o' },
1987
1988         { 0,                    '\0'},
1989 };
1990
1991 #define TTY_FLAG_BITS \
1992         "\20\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \
1993         "\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \
1994         "\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK"
1995
1996 #define DB_PRINTSYM(name, addr) \
1997         db_printf("%s  " #name ": ", sep); \
1998         db_printsym((db_addr_t) addr, DB_STGY_ANY); \
1999         db_printf("\n");
2000
2001 static void
2002 _db_show_devsw(const char *sep, const struct ttydevsw *tsw)
2003 {
2004         db_printf("%sdevsw: ", sep);
2005         db_printsym((db_addr_t)tsw, DB_STGY_ANY);
2006         db_printf(" (%p)\n", tsw);
2007         DB_PRINTSYM(open, tsw->tsw_open);
2008         DB_PRINTSYM(close, tsw->tsw_close);
2009         DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup);
2010         DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup);
2011         DB_PRINTSYM(ioctl, tsw->tsw_ioctl);
2012         DB_PRINTSYM(param, tsw->tsw_param);
2013         DB_PRINTSYM(modem, tsw->tsw_modem);
2014         DB_PRINTSYM(mmap, tsw->tsw_mmap);
2015         DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify);
2016         DB_PRINTSYM(free, tsw->tsw_free);
2017 }
2018 static void
2019 _db_show_hooks(const char *sep, const struct ttyhook *th)
2020 {
2021         db_printf("%shook: ", sep);
2022         db_printsym((db_addr_t)th, DB_STGY_ANY);
2023         db_printf(" (%p)\n", th);
2024         if (th == NULL)
2025                 return;
2026         DB_PRINTSYM(rint, th->th_rint);
2027         DB_PRINTSYM(rint_bypass, th->th_rint_bypass);
2028         DB_PRINTSYM(rint_done, th->th_rint_done);
2029         DB_PRINTSYM(rint_poll, th->th_rint_poll);
2030         DB_PRINTSYM(getc_inject, th->th_getc_inject);
2031         DB_PRINTSYM(getc_capture, th->th_getc_capture);
2032         DB_PRINTSYM(getc_poll, th->th_getc_poll);
2033         DB_PRINTSYM(close, th->th_close);
2034 }
2035
2036 static void
2037 _db_show_termios(const char *name, const struct termios *t)
2038 {
2039
2040         db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x "
2041             "lflag 0x%x ispeed %u ospeed %u\n", name,
2042             t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag,
2043             t->c_ispeed, t->c_ospeed);
2044 }
2045
2046 /* DDB command to show TTY statistics. */
2047 DB_SHOW_COMMAND(tty, db_show_tty)
2048 {
2049         struct tty *tp;
2050
2051         if (!have_addr) {
2052                 db_printf("usage: show tty <addr>\n");
2053                 return;
2054         }
2055         tp = (struct tty *)addr;
2056
2057         db_printf("0x%p: %s\n", tp, tty_devname(tp));
2058         db_printf("\tmtx: %p\n", tp->t_mtx);
2059         db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS);
2060         db_printf("\trevokecnt: %u\n", tp->t_revokecnt);
2061
2062         /* Buffering mechanisms. */
2063         db_printf("\tinq: %p begin %u linestart %u reprint %u end %u "
2064             "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin,
2065             tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end,
2066             tp->t_inq.ti_nblocks, tp->t_inq.ti_quota);
2067         db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n",
2068             &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end,
2069             tp->t_outq.to_nblocks, tp->t_outq.to_quota);
2070         db_printf("\tinlow: %zu\n", tp->t_inlow);
2071         db_printf("\toutlow: %zu\n", tp->t_outlow);
2072         _db_show_termios("\ttermios", &tp->t_termios);
2073         db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n",
2074             tp->t_winsize.ws_row, tp->t_winsize.ws_col,
2075             tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel);
2076         db_printf("\tcolumn: %u\n", tp->t_column);
2077         db_printf("\twritepos: %u\n", tp->t_writepos);
2078         db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags);
2079
2080         /* Init/lock-state devices. */
2081         _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in);
2082         _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out);
2083         _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in);
2084         _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out);
2085
2086         /* Hooks */
2087         _db_show_devsw("\t", tp->t_devsw);
2088         _db_show_hooks("\t", tp->t_hook);
2089
2090         /* Process info. */
2091         db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp,
2092             tp->t_pgrp ? tp->t_pgrp->pg_id : 0,
2093             tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0);
2094         db_printf("\tsession: %p", tp->t_session);
2095         if (tp->t_session != NULL)
2096             db_printf(" count %u leader %p tty %p sid %d login %s",
2097                 tp->t_session->s_count, tp->t_session->s_leader,
2098                 tp->t_session->s_ttyp, tp->t_session->s_sid,
2099                 tp->t_session->s_login);
2100         db_printf("\n");
2101         db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt);
2102         db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc);
2103         db_printf("\thooksoftc: %p\n", tp->t_hooksoftc);
2104         db_printf("\tdev: %p\n", tp->t_dev);
2105 }
2106
2107 /* DDB command to list TTYs. */
2108 DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys)
2109 {
2110         struct tty *tp;
2111         size_t isiz, osiz;
2112         int i, j;
2113
2114         /* Make the output look like `pstat -t'. */
2115         db_printf("PTR        ");
2116 #if defined(__LP64__)
2117         db_printf("        ");
2118 #endif
2119         db_printf("      LINE   INQ  CAN  LIN  LOW  OUTQ  USE  LOW   "
2120             "COL  SESS  PGID STATE\n");
2121
2122         TAILQ_FOREACH(tp, &tty_list, t_list) {
2123                 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE;
2124                 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE;
2125
2126                 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ",
2127                     tp,
2128                     tty_devname(tp),
2129                     isiz,
2130                     tp->t_inq.ti_linestart - tp->t_inq.ti_begin,
2131                     tp->t_inq.ti_end - tp->t_inq.ti_linestart,
2132                     isiz - tp->t_inlow,
2133                     osiz,
2134                     tp->t_outq.to_end - tp->t_outq.to_begin,
2135                     osiz - tp->t_outlow,
2136                     MIN(tp->t_column, 99999),
2137                     tp->t_session ? tp->t_session->s_sid : 0,
2138                     tp->t_pgrp ? tp->t_pgrp->pg_id : 0);
2139
2140                 /* Flag bits. */
2141                 for (i = j = 0; ttystates[i].flag; i++)
2142                         if (tp->t_flags & ttystates[i].flag) {
2143                                 db_printf("%c", ttystates[i].val);
2144                                 j++;
2145                         }
2146                 if (j == 0)
2147                         db_printf("-");
2148                 db_printf("\n");
2149         }
2150 }
2151 #endif /* DDB */