tty.c revision 209718
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: head/sys/kern/tty.c 209718 2010-07-06 08:56:34Z ed $"); 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 68static MALLOC_DEFINE(M_TTY, "tty", "tty device"); 69 70static void tty_rel_free(struct tty *tp); 71 72static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list); 73static struct sx tty_list_sx; 74SX_SYSINIT(tty_list, &tty_list_sx, "tty list"); 75static unsigned int tty_list_count = 0; 76 77/* Character device of /dev/console. */ 78static struct cdev *dev_console; 79static 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 102static void 103tty_watermarks(struct tty *tp) 104{ 105 size_t bs = 0; 106 107 /* Provide an input buffer for 0.2 seconds of data. */ 108 if (tp->t_termios.c_cflag & CREAD) 109 bs = MIN(tp->t_termios.c_ispeed / 5, TTYBUF_MAX); 110 ttyinq_setsize(&tp->t_inq, tp, bs); 111 112 /* Set low watermark at 10% (when 90% is available). */ 113 tp->t_inlow = (ttyinq_getallocatedsize(&tp->t_inq) * 9) / 10; 114 115 /* Provide an ouput buffer for 0.2 seconds of data. */ 116 bs = MIN(tp->t_termios.c_ospeed / 5, TTYBUF_MAX); 117 ttyoutq_setsize(&tp->t_outq, tp, bs); 118 119 /* Set low watermark at 10% (when 90% is available). */ 120 tp->t_outlow = (ttyoutq_getallocatedsize(&tp->t_outq) * 9) / 10; 121} 122 123static int 124tty_drain(struct tty *tp) 125{ 126 int error; 127 128 if (ttyhook_hashook(tp, getc_inject)) 129 /* buffer is inaccessible */ 130 return (0); 131 132 while (ttyoutq_bytesused(&tp->t_outq) > 0) { 133 ttydevsw_outwakeup(tp); 134 /* Could be handled synchronously. */ 135 if (ttyoutq_bytesused(&tp->t_outq) == 0) 136 return (0); 137 138 /* Wait for data to be drained. */ 139 error = tty_wait(tp, &tp->t_outwait); 140 if (error) 141 return (error); 142 } 143 144 return (0); 145} 146 147/* 148 * Though ttydev_enter() and ttydev_leave() seem to be related, they 149 * don't have to be used together. ttydev_enter() is used by the cdev 150 * operations to prevent an actual operation from being processed when 151 * the TTY has been abandoned. ttydev_leave() is used by ttydev_open() 152 * and ttydev_close() to determine whether per-TTY data should be 153 * deallocated. 154 */ 155 156static __inline int 157ttydev_enter(struct tty *tp) 158{ 159 tty_lock(tp); 160 161 if (tty_gone(tp) || !tty_opened(tp)) { 162 /* Device is already gone. */ 163 tty_unlock(tp); 164 return (ENXIO); 165 } 166 167 return (0); 168} 169 170static void 171ttydev_leave(struct tty *tp) 172{ 173 tty_lock_assert(tp, MA_OWNED); 174 175 if (tty_opened(tp) || tp->t_flags & TF_OPENCLOSE) { 176 /* Device is still opened somewhere. */ 177 tty_unlock(tp); 178 return; 179 } 180 181 tp->t_flags |= TF_OPENCLOSE; 182 183 /* Stop asynchronous I/O. */ 184 funsetown(&tp->t_sigio); 185 186 /* Remove console TTY. */ 187 if (constty == tp) 188 constty_clear(); 189 190 /* Drain any output. */ 191 MPASS((tp->t_flags & TF_STOPPED) == 0); 192 if (!tty_gone(tp)) 193 tty_drain(tp); 194 195 ttydisc_close(tp); 196 197 /* Destroy associated buffers already. */ 198 ttyinq_free(&tp->t_inq); 199 tp->t_inlow = 0; 200 ttyoutq_free(&tp->t_outq); 201 tp->t_outlow = 0; 202 203 knlist_clear(&tp->t_inpoll.si_note, 1); 204 knlist_clear(&tp->t_outpoll.si_note, 1); 205 206 if (!tty_gone(tp)) 207 ttydevsw_close(tp); 208 209 tp->t_flags &= ~TF_OPENCLOSE; 210 cv_broadcast(&tp->t_dcdwait); 211 tty_rel_free(tp); 212} 213 214/* 215 * Operations that are exposed through the character device in /dev. 216 */ 217static int 218ttydev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 219{ 220 struct tty *tp = dev->si_drv1; 221 int error = 0; 222 223 tty_lock(tp); 224 if (tty_gone(tp)) { 225 /* Device is already gone. */ 226 tty_unlock(tp); 227 return (ENXIO); 228 } 229 230 /* 231 * Block when other processes are currently opening or closing 232 * the TTY. 233 */ 234 while (tp->t_flags & TF_OPENCLOSE) { 235 error = tty_wait(tp, &tp->t_dcdwait); 236 if (error != 0) { 237 tty_unlock(tp); 238 return (error); 239 } 240 } 241 tp->t_flags |= TF_OPENCLOSE; 242 243 /* 244 * Make sure the "tty" and "cua" device cannot be opened at the 245 * same time. 246 */ 247 if (TTY_CALLOUT(tp, dev)) { 248 if (tp->t_flags & TF_OPENED_IN) { 249 error = EBUSY; 250 goto done; 251 } 252 } else { 253 if (tp->t_flags & TF_OPENED_OUT) { 254 error = EBUSY; 255 goto done; 256 } 257 } 258 259 if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) { 260 error = EBUSY; 261 goto done; 262 } 263 264 if (!tty_opened(tp)) { 265 /* Set proper termios flags. */ 266 if (TTY_CALLOUT(tp, dev)) { 267 tp->t_termios = tp->t_termios_init_out; 268 } else { 269 tp->t_termios = tp->t_termios_init_in; 270 } 271 ttydevsw_param(tp, &tp->t_termios); 272 273 ttydevsw_modem(tp, SER_DTR|SER_RTS, 0); 274 275 error = ttydevsw_open(tp); 276 if (error != 0) 277 goto done; 278 279 ttydisc_open(tp); 280 tty_watermarks(tp); 281 } 282 283 /* Wait for Carrier Detect. */ 284 if (!TTY_CALLOUT(tp, dev) && (oflags & O_NONBLOCK) == 0 && 285 (tp->t_termios.c_cflag & CLOCAL) == 0) { 286 while ((ttydevsw_modem(tp, 0, 0) & SER_DCD) == 0) { 287 error = tty_wait(tp, &tp->t_dcdwait); 288 if (error != 0) 289 goto done; 290 } 291 } 292 293 if (dev == dev_console) 294 tp->t_flags |= TF_OPENED_CONS; 295 else if (TTY_CALLOUT(tp, dev)) 296 tp->t_flags |= TF_OPENED_OUT; 297 else 298 tp->t_flags |= TF_OPENED_IN; 299 300done: tp->t_flags &= ~TF_OPENCLOSE; 301 cv_broadcast(&tp->t_dcdwait); 302 ttydev_leave(tp); 303 304 return (error); 305} 306 307static int 308ttydev_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 309{ 310 struct tty *tp = dev->si_drv1; 311 312 tty_lock(tp); 313 314 /* 315 * Don't actually close the device if it is being used as the 316 * console. 317 */ 318 MPASS((tp->t_flags & TF_OPENED) != TF_OPENED); 319 if (dev == dev_console) 320 tp->t_flags &= ~TF_OPENED_CONS; 321 else 322 tp->t_flags &= ~(TF_OPENED_IN|TF_OPENED_OUT); 323 324 if (tp->t_flags & TF_OPENED) { 325 tty_unlock(tp); 326 return (0); 327 } 328 329 /* 330 * This can only be called once. The callin and the callout 331 * devices cannot be opened at the same time. 332 */ 333 tp->t_flags &= ~(TF_EXCLUDE|TF_STOPPED); 334 335 /* Properly wake up threads that are stuck - revoke(). */ 336 tp->t_revokecnt++; 337 tty_wakeup(tp, FREAD|FWRITE); 338 cv_broadcast(&tp->t_bgwait); 339 cv_broadcast(&tp->t_dcdwait); 340 341 ttydev_leave(tp); 342 343 return (0); 344} 345 346static __inline int 347tty_is_ctty(struct tty *tp, struct proc *p) 348{ 349 tty_lock_assert(tp, MA_OWNED); 350 351 return (p->p_session == tp->t_session && p->p_flag & P_CONTROLT); 352} 353 354static int 355tty_wait_background(struct tty *tp, struct thread *td, int sig) 356{ 357 struct proc *p = td->td_proc; 358 struct pgrp *pg; 359 ksiginfo_t ksi; 360 int error; 361 362 MPASS(sig == SIGTTIN || sig == SIGTTOU); 363 tty_lock_assert(tp, MA_OWNED); 364 365 for (;;) { 366 PROC_LOCK(p); 367 /* 368 * The process should only sleep, when: 369 * - This terminal is the controling terminal 370 * - Its process group is not the foreground process 371 * group 372 * - The parent process isn't waiting for the child to 373 * exit 374 * - the signal to send to the process isn't masked 375 */ 376 if (!tty_is_ctty(tp, p) || p->p_pgrp == tp->t_pgrp) { 377 /* Allow the action to happen. */ 378 PROC_UNLOCK(p); 379 return (0); 380 } 381 382 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, sig) || 383 SIGISMEMBER(td->td_sigmask, sig)) { 384 /* Only allow them in write()/ioctl(). */ 385 PROC_UNLOCK(p); 386 return (sig == SIGTTOU ? 0 : EIO); 387 } 388 389 pg = p->p_pgrp; 390 if (p->p_flag & P_PPWAIT || pg->pg_jobc == 0) { 391 /* Don't allow the action to happen. */ 392 PROC_UNLOCK(p); 393 return (EIO); 394 } 395 PROC_UNLOCK(p); 396 397 /* 398 * Send the signal and sleep until we're the new 399 * foreground process group. 400 */ 401 if (sig != 0) { 402 ksiginfo_init(&ksi); 403 ksi.ksi_code = SI_KERNEL; 404 ksi.ksi_signo = sig; 405 sig = 0; 406 } 407 PGRP_LOCK(pg); 408 pgsignal(pg, ksi.ksi_signo, 1, &ksi); 409 PGRP_UNLOCK(pg); 410 411 error = tty_wait(tp, &tp->t_bgwait); 412 if (error) 413 return (error); 414 } 415} 416 417static int 418ttydev_read(struct cdev *dev, struct uio *uio, int ioflag) 419{ 420 struct tty *tp = dev->si_drv1; 421 int error; 422 423 error = ttydev_enter(tp); 424 if (error) 425 goto done; 426 427 error = tty_wait_background(tp, curthread, SIGTTIN); 428 if (error) { 429 tty_unlock(tp); 430 goto done; 431 } 432 433 error = ttydisc_read(tp, uio, ioflag); 434 tty_unlock(tp); 435 436 /* 437 * The read() call should not throw an error when the device is 438 * being destroyed. Silently convert it to an EOF. 439 */ 440done: if (error == ENXIO) 441 error = 0; 442 return (error); 443} 444 445static int 446ttydev_write(struct cdev *dev, struct uio *uio, int ioflag) 447{ 448 struct tty *tp = dev->si_drv1; 449 int error; 450 451 error = ttydev_enter(tp); 452 if (error) 453 return (error); 454 455 if (tp->t_termios.c_lflag & TOSTOP) { 456 error = tty_wait_background(tp, curthread, SIGTTOU); 457 if (error) 458 goto done; 459 } 460 461 if (ioflag & IO_NDELAY && tp->t_flags & TF_BUSY_OUT) { 462 /* Allow non-blocking writes to bypass serialization. */ 463 error = ttydisc_write(tp, uio, ioflag); 464 } else { 465 /* Serialize write() calls. */ 466 while (tp->t_flags & TF_BUSY_OUT) { 467 error = tty_wait(tp, &tp->t_outserwait); 468 if (error) 469 goto done; 470 } 471 472 tp->t_flags |= TF_BUSY_OUT; 473 error = ttydisc_write(tp, uio, ioflag); 474 tp->t_flags &= ~TF_BUSY_OUT; 475 cv_signal(&tp->t_outserwait); 476 } 477 478done: tty_unlock(tp); 479 return (error); 480} 481 482static int 483ttydev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 484 struct thread *td) 485{ 486 struct tty *tp = dev->si_drv1; 487 int error; 488 489 error = ttydev_enter(tp); 490 if (error) 491 return (error); 492 493 switch (cmd) { 494 case TIOCCBRK: 495 case TIOCCONS: 496 case TIOCDRAIN: 497 case TIOCEXCL: 498 case TIOCFLUSH: 499 case TIOCNXCL: 500 case TIOCSBRK: 501 case TIOCSCTTY: 502 case TIOCSETA: 503 case TIOCSETAF: 504 case TIOCSETAW: 505 case TIOCSPGRP: 506 case TIOCSTART: 507 case TIOCSTAT: 508 case TIOCSTI: 509 case TIOCSTOP: 510 case TIOCSWINSZ: 511#if 0 512 case TIOCSDRAINWAIT: 513 case TIOCSETD: 514#endif 515#ifdef COMPAT_43TTY 516 case TIOCLBIC: 517 case TIOCLBIS: 518 case TIOCLSET: 519 case TIOCSETC: 520 case OTIOCSETD: 521 case TIOCSETN: 522 case TIOCSETP: 523 case TIOCSLTC: 524#endif /* COMPAT_43TTY */ 525 /* 526 * If the ioctl() causes the TTY to be modified, let it 527 * wait in the background. 528 */ 529 error = tty_wait_background(tp, curthread, SIGTTOU); 530 if (error) 531 goto done; 532 } 533 534 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 535 struct termios *old = &tp->t_termios; 536 struct termios *new = (struct termios *)data; 537 struct termios *lock = TTY_CALLOUT(tp, dev) ? 538 &tp->t_termios_lock_out : &tp->t_termios_lock_in; 539 int cc; 540 541 /* 542 * Lock state devices. Just overwrite the values of the 543 * commands that are currently in use. 544 */ 545 new->c_iflag = (old->c_iflag & lock->c_iflag) | 546 (new->c_iflag & ~lock->c_iflag); 547 new->c_oflag = (old->c_oflag & lock->c_oflag) | 548 (new->c_oflag & ~lock->c_oflag); 549 new->c_cflag = (old->c_cflag & lock->c_cflag) | 550 (new->c_cflag & ~lock->c_cflag); 551 new->c_lflag = (old->c_lflag & lock->c_lflag) | 552 (new->c_lflag & ~lock->c_lflag); 553 for (cc = 0; cc < NCCS; ++cc) 554 if (lock->c_cc[cc]) 555 new->c_cc[cc] = old->c_cc[cc]; 556 if (lock->c_ispeed) 557 new->c_ispeed = old->c_ispeed; 558 if (lock->c_ospeed) 559 new->c_ospeed = old->c_ospeed; 560 } 561 562 error = tty_ioctl(tp, cmd, data, fflag, td); 563done: tty_unlock(tp); 564 565 return (error); 566} 567 568static int 569ttydev_poll(struct cdev *dev, int events, struct thread *td) 570{ 571 struct tty *tp = dev->si_drv1; 572 int error, revents = 0; 573 574 error = ttydev_enter(tp); 575 if (error) 576 return ((events & (POLLIN|POLLRDNORM)) | POLLHUP); 577 578 if (events & (POLLIN|POLLRDNORM)) { 579 /* See if we can read something. */ 580 if (ttydisc_read_poll(tp) > 0) 581 revents |= events & (POLLIN|POLLRDNORM); 582 } 583 584 if (tp->t_flags & TF_ZOMBIE) { 585 /* Hangup flag on zombie state. */ 586 revents |= POLLHUP; 587 } else if (events & (POLLOUT|POLLWRNORM)) { 588 /* See if we can write something. */ 589 if (ttydisc_write_poll(tp) > 0) 590 revents |= events & (POLLOUT|POLLWRNORM); 591 } 592 593 if (revents == 0) { 594 if (events & (POLLIN|POLLRDNORM)) 595 selrecord(td, &tp->t_inpoll); 596 if (events & (POLLOUT|POLLWRNORM)) 597 selrecord(td, &tp->t_outpoll); 598 } 599 600 tty_unlock(tp); 601 602 return (revents); 603} 604 605static int 606ttydev_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 607 int nprot, vm_memattr_t *memattr) 608{ 609 struct tty *tp = dev->si_drv1; 610 int error; 611 612 /* Handle mmap() through the driver. */ 613 614 error = ttydev_enter(tp); 615 if (error) 616 return (-1); 617 error = ttydevsw_mmap(tp, offset, paddr, nprot, memattr); 618 tty_unlock(tp); 619 620 return (error); 621} 622 623/* 624 * kqueue support. 625 */ 626 627static void 628tty_kqops_read_detach(struct knote *kn) 629{ 630 struct tty *tp = kn->kn_hook; 631 632 knlist_remove(&tp->t_inpoll.si_note, kn, 0); 633} 634 635static int 636tty_kqops_read_event(struct knote *kn, long hint) 637{ 638 struct tty *tp = kn->kn_hook; 639 640 tty_lock_assert(tp, MA_OWNED); 641 642 if (tty_gone(tp) || tp->t_flags & TF_ZOMBIE) { 643 kn->kn_flags |= EV_EOF; 644 return (1); 645 } else { 646 kn->kn_data = ttydisc_read_poll(tp); 647 return (kn->kn_data > 0); 648 } 649} 650 651static void 652tty_kqops_write_detach(struct knote *kn) 653{ 654 struct tty *tp = kn->kn_hook; 655 656 knlist_remove(&tp->t_outpoll.si_note, kn, 0); 657} 658 659static int 660tty_kqops_write_event(struct knote *kn, long hint) 661{ 662 struct tty *tp = kn->kn_hook; 663 664 tty_lock_assert(tp, MA_OWNED); 665 666 if (tty_gone(tp)) { 667 kn->kn_flags |= EV_EOF; 668 return (1); 669 } else { 670 kn->kn_data = ttydisc_write_poll(tp); 671 return (kn->kn_data > 0); 672 } 673} 674 675static struct filterops tty_kqops_read = { 676 .f_isfd = 1, 677 .f_detach = tty_kqops_read_detach, 678 .f_event = tty_kqops_read_event, 679}; 680static struct filterops tty_kqops_write = { 681 .f_isfd = 1, 682 .f_detach = tty_kqops_write_detach, 683 .f_event = tty_kqops_write_event, 684}; 685 686static int 687ttydev_kqfilter(struct cdev *dev, struct knote *kn) 688{ 689 struct tty *tp = dev->si_drv1; 690 int error; 691 692 error = ttydev_enter(tp); 693 if (error) 694 return (error); 695 696 switch (kn->kn_filter) { 697 case EVFILT_READ: 698 kn->kn_hook = tp; 699 kn->kn_fop = &tty_kqops_read; 700 knlist_add(&tp->t_inpoll.si_note, kn, 1); 701 break; 702 case EVFILT_WRITE: 703 kn->kn_hook = tp; 704 kn->kn_fop = &tty_kqops_write; 705 knlist_add(&tp->t_outpoll.si_note, kn, 1); 706 break; 707 default: 708 error = EINVAL; 709 break; 710 } 711 712 tty_unlock(tp); 713 return (error); 714} 715 716static struct cdevsw ttydev_cdevsw = { 717 .d_version = D_VERSION, 718 .d_open = ttydev_open, 719 .d_close = ttydev_close, 720 .d_read = ttydev_read, 721 .d_write = ttydev_write, 722 .d_ioctl = ttydev_ioctl, 723 .d_kqfilter = ttydev_kqfilter, 724 .d_poll = ttydev_poll, 725 .d_mmap = ttydev_mmap, 726 .d_name = "ttydev", 727 .d_flags = D_TTY, 728}; 729 730/* 731 * Init/lock-state devices 732 */ 733 734static int 735ttyil_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 736{ 737 struct tty *tp = dev->si_drv1; 738 int error = 0; 739 740 tty_lock(tp); 741 if (tty_gone(tp)) 742 error = ENODEV; 743 tty_unlock(tp); 744 745 return (error); 746} 747 748static int 749ttyil_close(struct cdev *dev, int flag, int mode, struct thread *td) 750{ 751 return (0); 752} 753 754static int 755ttyil_rdwr(struct cdev *dev, struct uio *uio, int ioflag) 756{ 757 return (ENODEV); 758} 759 760static int 761ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 762 struct thread *td) 763{ 764 struct tty *tp = dev->si_drv1; 765 int error = 0; 766 767 tty_lock(tp); 768 if (tty_gone(tp)) { 769 error = ENODEV; 770 goto done; 771 } 772 773 switch (cmd) { 774 case TIOCGETA: 775 /* Obtain terminal flags through tcgetattr(). */ 776 *(struct termios*)data = *(struct termios*)dev->si_drv2; 777 break; 778 case TIOCSETA: 779 /* Set terminal flags through tcsetattr(). */ 780 error = priv_check(td, PRIV_TTY_SETA); 781 if (error) 782 break; 783 *(struct termios*)dev->si_drv2 = *(struct termios*)data; 784 break; 785 case TIOCGETD: 786 *(int *)data = TTYDISC; 787 break; 788 case TIOCGWINSZ: 789 bzero(data, sizeof(struct winsize)); 790 break; 791 default: 792 error = ENOTTY; 793 } 794 795done: tty_unlock(tp); 796 return (error); 797} 798 799static struct cdevsw ttyil_cdevsw = { 800 .d_version = D_VERSION, 801 .d_open = ttyil_open, 802 .d_close = ttyil_close, 803 .d_read = ttyil_rdwr, 804 .d_write = ttyil_rdwr, 805 .d_ioctl = ttyil_ioctl, 806 .d_name = "ttyil", 807 .d_flags = D_TTY, 808}; 809 810static void 811tty_init_termios(struct tty *tp) 812{ 813 struct termios *t = &tp->t_termios_init_in; 814 815 t->c_cflag = TTYDEF_CFLAG; 816 t->c_iflag = TTYDEF_IFLAG; 817 t->c_lflag = TTYDEF_LFLAG; 818 t->c_oflag = TTYDEF_OFLAG; 819 t->c_ispeed = TTYDEF_SPEED; 820 t->c_ospeed = TTYDEF_SPEED; 821 memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars); 822 823 tp->t_termios_init_out = *t; 824} 825 826void 827tty_init_console(struct tty *tp, speed_t s) 828{ 829 struct termios *ti = &tp->t_termios_init_in; 830 struct termios *to = &tp->t_termios_init_out; 831 832 if (s != 0) { 833 ti->c_ispeed = ti->c_ospeed = s; 834 to->c_ispeed = to->c_ospeed = s; 835 } 836 837 ti->c_cflag |= CLOCAL; 838 to->c_cflag |= CLOCAL; 839} 840 841/* 842 * Standard device routine implementations, mostly meant for 843 * pseudo-terminal device drivers. When a driver creates a new terminal 844 * device class, missing routines are patched. 845 */ 846 847static int 848ttydevsw_defopen(struct tty *tp) 849{ 850 851 return (0); 852} 853 854static void 855ttydevsw_defclose(struct tty *tp) 856{ 857} 858 859static void 860ttydevsw_defoutwakeup(struct tty *tp) 861{ 862 863 panic("Terminal device has output, while not implemented"); 864} 865 866static void 867ttydevsw_definwakeup(struct tty *tp) 868{ 869} 870 871static int 872ttydevsw_defioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td) 873{ 874 875 return (ENOIOCTL); 876} 877 878static int 879ttydevsw_defparam(struct tty *tp, struct termios *t) 880{ 881 882 /* 883 * Allow the baud rate to be adjusted for pseudo-devices, but at 884 * least restrict it to 115200 to prevent excessive buffer 885 * usage. Also disallow 0, to prevent foot shooting. 886 */ 887 if (t->c_ispeed < B50) 888 t->c_ispeed = B50; 889 else if (t->c_ispeed > B115200) 890 t->c_ispeed = B115200; 891 if (t->c_ospeed < B50) 892 t->c_ospeed = B50; 893 else if (t->c_ospeed > B115200) 894 t->c_ospeed = B115200; 895 t->c_cflag |= CREAD; 896 897 return (0); 898} 899 900static int 901ttydevsw_defmodem(struct tty *tp, int sigon, int sigoff) 902{ 903 904 /* Simulate a carrier to make the TTY layer happy. */ 905 return (SER_DCD); 906} 907 908static int 909ttydevsw_defmmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t *paddr, 910 int nprot, vm_memattr_t *memattr) 911{ 912 913 return (-1); 914} 915 916static void 917ttydevsw_defpktnotify(struct tty *tp, char event) 918{ 919} 920 921static void 922ttydevsw_deffree(void *softc) 923{ 924 925 panic("Terminal device freed without a free-handler"); 926} 927 928/* 929 * TTY allocation and deallocation. TTY devices can be deallocated when 930 * the driver doesn't use it anymore, when the TTY isn't a session's 931 * controlling TTY and when the device node isn't opened through devfs. 932 */ 933 934struct tty * 935tty_alloc(struct ttydevsw *tsw, void *sc) 936{ 937 938 return (tty_alloc_mutex(tsw, sc, NULL)); 939} 940 941struct tty * 942tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex) 943{ 944 struct tty *tp; 945 946 /* Make sure the driver defines all routines. */ 947#define PATCH_FUNC(x) do { \ 948 if (tsw->tsw_ ## x == NULL) \ 949 tsw->tsw_ ## x = ttydevsw_def ## x; \ 950} while (0) 951 PATCH_FUNC(open); 952 PATCH_FUNC(close); 953 PATCH_FUNC(outwakeup); 954 PATCH_FUNC(inwakeup); 955 PATCH_FUNC(ioctl); 956 PATCH_FUNC(param); 957 PATCH_FUNC(modem); 958 PATCH_FUNC(mmap); 959 PATCH_FUNC(pktnotify); 960 PATCH_FUNC(free); 961#undef PATCH_FUNC 962 963 tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO); 964 tp->t_devsw = tsw; 965 tp->t_devswsoftc = sc; 966 tp->t_flags = tsw->tsw_flags; 967 968 tty_init_termios(tp); 969 970 cv_init(&tp->t_inwait, "ttyin"); 971 cv_init(&tp->t_outwait, "ttyout"); 972 cv_init(&tp->t_outserwait, "ttyosr"); 973 cv_init(&tp->t_bgwait, "ttybg"); 974 cv_init(&tp->t_dcdwait, "ttydcd"); 975 976 /* Allow drivers to use a custom mutex to lock the TTY. */ 977 if (mutex != NULL) { 978 tp->t_mtx = mutex; 979 } else { 980 tp->t_mtx = &tp->t_mtxobj; 981 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF); 982 } 983 984 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx); 985 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx); 986 987 sx_xlock(&tty_list_sx); 988 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 989 tty_list_count++; 990 sx_xunlock(&tty_list_sx); 991 992 return (tp); 993} 994 995static void 996tty_dealloc(void *arg) 997{ 998 struct tty *tp = arg; 999 1000 sx_xlock(&tty_list_sx); 1001 TAILQ_REMOVE(&tty_list, tp, t_list); 1002 tty_list_count--; 1003 sx_xunlock(&tty_list_sx); 1004 1005 /* Make sure we haven't leaked buffers. */ 1006 MPASS(ttyinq_getsize(&tp->t_inq) == 0); 1007 MPASS(ttyoutq_getsize(&tp->t_outq) == 0); 1008 1009 knlist_destroy(&tp->t_inpoll.si_note); 1010 knlist_destroy(&tp->t_outpoll.si_note); 1011 1012 cv_destroy(&tp->t_inwait); 1013 cv_destroy(&tp->t_outwait); 1014 cv_destroy(&tp->t_bgwait); 1015 cv_destroy(&tp->t_dcdwait); 1016 cv_destroy(&tp->t_outserwait); 1017 1018 if (tp->t_mtx == &tp->t_mtxobj) 1019 mtx_destroy(&tp->t_mtxobj); 1020 ttydevsw_free(tp); 1021 free(tp, M_TTY); 1022} 1023 1024static void 1025tty_rel_free(struct tty *tp) 1026{ 1027 struct cdev *dev; 1028 1029 tty_lock_assert(tp, MA_OWNED); 1030 1031#define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE) 1032 if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) { 1033 /* TTY is still in use. */ 1034 tty_unlock(tp); 1035 return; 1036 } 1037 1038 /* TTY can be deallocated. */ 1039 dev = tp->t_dev; 1040 tp->t_dev = NULL; 1041 tty_unlock(tp); 1042 1043 if (dev != NULL) 1044 destroy_dev_sched_cb(dev, tty_dealloc, tp); 1045} 1046 1047void 1048tty_rel_pgrp(struct tty *tp, struct pgrp *pg) 1049{ 1050 MPASS(tp->t_sessioncnt > 0); 1051 tty_lock_assert(tp, MA_OWNED); 1052 1053 if (tp->t_pgrp == pg) 1054 tp->t_pgrp = NULL; 1055 1056 tty_unlock(tp); 1057} 1058 1059void 1060tty_rel_sess(struct tty *tp, struct session *sess) 1061{ 1062 MPASS(tp->t_sessioncnt > 0); 1063 1064 /* Current session has left. */ 1065 if (tp->t_session == sess) { 1066 tp->t_session = NULL; 1067 MPASS(tp->t_pgrp == NULL); 1068 } 1069 tp->t_sessioncnt--; 1070 tty_rel_free(tp); 1071} 1072 1073void 1074tty_rel_gone(struct tty *tp) 1075{ 1076 MPASS(!tty_gone(tp)); 1077 1078 /* Simulate carrier removal. */ 1079 ttydisc_modem(tp, 0); 1080 1081 /* Wake up all blocked threads. */ 1082 tty_wakeup(tp, FREAD|FWRITE); 1083 cv_broadcast(&tp->t_bgwait); 1084 cv_broadcast(&tp->t_dcdwait); 1085 1086 tp->t_flags |= TF_GONE; 1087 tty_rel_free(tp); 1088} 1089 1090/* 1091 * Exposing information about current TTY's through sysctl 1092 */ 1093 1094static void 1095tty_to_xtty(struct tty *tp, struct xtty *xt) 1096{ 1097 tty_lock_assert(tp, MA_OWNED); 1098 1099 xt->xt_size = sizeof(struct xtty); 1100 xt->xt_insize = ttyinq_getsize(&tp->t_inq); 1101 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq); 1102 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq); 1103 xt->xt_inlow = tp->t_inlow; 1104 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq); 1105 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq); 1106 xt->xt_outlow = tp->t_outlow; 1107 xt->xt_column = tp->t_column; 1108 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1109 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0; 1110 xt->xt_flags = tp->t_flags; 1111 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV; 1112} 1113 1114static int 1115sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 1116{ 1117 unsigned long lsize; 1118 struct xtty *xtlist, *xt; 1119 struct tty *tp; 1120 int error; 1121 1122 sx_slock(&tty_list_sx); 1123 lsize = tty_list_count * sizeof(struct xtty); 1124 if (lsize == 0) { 1125 sx_sunlock(&tty_list_sx); 1126 return (0); 1127 } 1128 1129 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK); 1130 1131 TAILQ_FOREACH(tp, &tty_list, t_list) { 1132 tty_lock(tp); 1133 tty_to_xtty(tp, xt); 1134 tty_unlock(tp); 1135 xt++; 1136 } 1137 sx_sunlock(&tty_list_sx); 1138 1139 error = SYSCTL_OUT(req, xtlist, lsize); 1140 free(xtlist, M_TTY); 1141 return (error); 1142} 1143 1144SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 1145 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs"); 1146 1147/* 1148 * Device node creation. Device has been set up, now we can expose it to 1149 * the user. 1150 */ 1151 1152void 1153tty_makedev(struct tty *tp, struct ucred *cred, const char *fmt, ...) 1154{ 1155 va_list ap; 1156 struct cdev *dev; 1157 const char *prefix = "tty"; 1158 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */ 1159 uid_t uid; 1160 gid_t gid; 1161 mode_t mode; 1162 1163 /* Remove "tty" prefix from devices like PTY's. */ 1164 if (tp->t_flags & TF_NOPREFIX) 1165 prefix = ""; 1166 1167 va_start(ap, fmt); 1168 vsnrprintf(name, sizeof name, 32, fmt, ap); 1169 va_end(ap); 1170 1171 if (cred == NULL) { 1172 /* System device. */ 1173 uid = UID_ROOT; 1174 gid = GID_WHEEL; 1175 mode = S_IRUSR|S_IWUSR; 1176 } else { 1177 /* User device. */ 1178 uid = cred->cr_ruid; 1179 gid = GID_TTY; 1180 mode = S_IRUSR|S_IWUSR|S_IWGRP; 1181 } 1182 1183 /* Master call-in device. */ 1184 dev = make_dev_cred(&ttydev_cdevsw, 0, cred, 1185 uid, gid, mode, "%s%s", prefix, name); 1186 dev->si_drv1 = tp; 1187 tp->t_dev = dev; 1188 1189 /* Slave call-in devices. */ 1190 if (tp->t_flags & TF_INITLOCK) { 1191 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1192 uid, gid, mode, "%s%s.init", prefix, name); 1193 dev_depends(tp->t_dev, dev); 1194 dev->si_drv1 = tp; 1195 dev->si_drv2 = &tp->t_termios_init_in; 1196 1197 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1198 uid, gid, mode, "%s%s.lock", prefix, name); 1199 dev_depends(tp->t_dev, dev); 1200 dev->si_drv1 = tp; 1201 dev->si_drv2 = &tp->t_termios_lock_in; 1202 } 1203 1204 /* Call-out devices. */ 1205 if (tp->t_flags & TF_CALLOUT) { 1206 dev = make_dev_cred(&ttydev_cdevsw, 0, cred, 1207 UID_UUCP, GID_DIALER, 0660, "cua%s", name); 1208 dev_depends(tp->t_dev, dev); 1209 dev->si_drv1 = tp; 1210 1211 /* Slave call-out devices. */ 1212 if (tp->t_flags & TF_INITLOCK) { 1213 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1214 UID_UUCP, GID_DIALER, 0660, "cua%s.init", name); 1215 dev_depends(tp->t_dev, dev); 1216 dev->si_drv1 = tp; 1217 dev->si_drv2 = &tp->t_termios_init_out; 1218 1219 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1220 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", name); 1221 dev_depends(tp->t_dev, dev); 1222 dev->si_drv1 = tp; 1223 dev->si_drv2 = &tp->t_termios_lock_out; 1224 } 1225 } 1226} 1227 1228/* 1229 * Signalling processes. 1230 */ 1231 1232void 1233tty_signal_sessleader(struct tty *tp, int sig) 1234{ 1235 struct proc *p; 1236 1237 tty_lock_assert(tp, MA_OWNED); 1238 MPASS(sig >= 1 && sig < NSIG); 1239 1240 /* Make signals start output again. */ 1241 tp->t_flags &= ~TF_STOPPED; 1242 1243 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) { 1244 p = tp->t_session->s_leader; 1245 PROC_LOCK(p); 1246 psignal(p, sig); 1247 PROC_UNLOCK(p); 1248 } 1249} 1250 1251void 1252tty_signal_pgrp(struct tty *tp, int sig) 1253{ 1254 ksiginfo_t ksi; 1255 1256 tty_lock_assert(tp, MA_OWNED); 1257 MPASS(sig >= 1 && sig < NSIG); 1258 1259 /* Make signals start output again. */ 1260 tp->t_flags &= ~TF_STOPPED; 1261 1262 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO)) 1263 tty_info(tp); 1264 if (tp->t_pgrp != NULL) { 1265 ksiginfo_init(&ksi); 1266 ksi.ksi_signo = sig; 1267 ksi.ksi_code = SI_KERNEL; 1268 PGRP_LOCK(tp->t_pgrp); 1269 pgsignal(tp->t_pgrp, sig, 1, &ksi); 1270 PGRP_UNLOCK(tp->t_pgrp); 1271 } 1272} 1273 1274void 1275tty_wakeup(struct tty *tp, int flags) 1276{ 1277 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL) 1278 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 1279 1280 if (flags & FWRITE) { 1281 cv_broadcast(&tp->t_outwait); 1282 selwakeup(&tp->t_outpoll); 1283 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0); 1284 } 1285 if (flags & FREAD) { 1286 cv_broadcast(&tp->t_inwait); 1287 selwakeup(&tp->t_inpoll); 1288 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0); 1289 } 1290} 1291 1292int 1293tty_wait(struct tty *tp, struct cv *cv) 1294{ 1295 int error; 1296 int revokecnt = tp->t_revokecnt; 1297 1298 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1299 MPASS(!tty_gone(tp)); 1300 1301 error = cv_wait_sig(cv, tp->t_mtx); 1302 1303 /* Restart the system call when we may have been revoked. */ 1304 if (tp->t_revokecnt != revokecnt) 1305 return (ERESTART); 1306 1307 /* Bail out when the device slipped away. */ 1308 if (tty_gone(tp)) 1309 return (ENXIO); 1310 1311 return (error); 1312} 1313 1314int 1315tty_timedwait(struct tty *tp, struct cv *cv, int hz) 1316{ 1317 int error; 1318 int revokecnt = tp->t_revokecnt; 1319 1320 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1321 MPASS(!tty_gone(tp)); 1322 1323 error = cv_timedwait_sig(cv, tp->t_mtx, hz); 1324 1325 /* Restart the system call when we may have been revoked. */ 1326 if (tp->t_revokecnt != revokecnt) 1327 return (ERESTART); 1328 1329 /* Bail out when the device slipped away. */ 1330 if (tty_gone(tp)) 1331 return (ENXIO); 1332 1333 return (error); 1334} 1335 1336void 1337tty_flush(struct tty *tp, int flags) 1338{ 1339 if (flags & FWRITE) { 1340 tp->t_flags &= ~TF_HIWAT_OUT; 1341 ttyoutq_flush(&tp->t_outq); 1342 tty_wakeup(tp, FWRITE); 1343 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE); 1344 } 1345 if (flags & FREAD) { 1346 tty_hiwat_in_unblock(tp); 1347 ttyinq_flush(&tp->t_inq); 1348 ttydevsw_inwakeup(tp); 1349 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD); 1350 } 1351} 1352 1353static int 1354tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, 1355 struct thread *td) 1356{ 1357 int error; 1358 1359 switch (cmd) { 1360 /* 1361 * Modem commands. 1362 * The SER_* and TIOCM_* flags are the same, but one bit 1363 * shifted. I don't know why. 1364 */ 1365 case TIOCSDTR: 1366 ttydevsw_modem(tp, SER_DTR, 0); 1367 return (0); 1368 case TIOCCDTR: 1369 ttydevsw_modem(tp, 0, SER_DTR); 1370 return (0); 1371 case TIOCMSET: { 1372 int bits = *(int *)data; 1373 ttydevsw_modem(tp, 1374 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 1375 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1376 return (0); 1377 } 1378 case TIOCMBIS: { 1379 int bits = *(int *)data; 1380 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0); 1381 return (0); 1382 } 1383 case TIOCMBIC: { 1384 int bits = *(int *)data; 1385 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1386 return (0); 1387 } 1388 case TIOCMGET: 1389 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1); 1390 return (0); 1391 1392 case FIOASYNC: 1393 if (*(int *)data) 1394 tp->t_flags |= TF_ASYNC; 1395 else 1396 tp->t_flags &= ~TF_ASYNC; 1397 return (0); 1398 case FIONBIO: 1399 /* This device supports non-blocking operation. */ 1400 return (0); 1401 case FIONREAD: 1402 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq); 1403 return (0); 1404 case FIONWRITE: 1405 case TIOCOUTQ: 1406 *(int *)data = ttyoutq_bytesused(&tp->t_outq); 1407 return (0); 1408 case FIOSETOWN: 1409 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1410 /* Not allowed to set ownership. */ 1411 return (ENOTTY); 1412 1413 /* Temporarily unlock the TTY to set ownership. */ 1414 tty_unlock(tp); 1415 error = fsetown(*(int *)data, &tp->t_sigio); 1416 tty_lock(tp); 1417 return (error); 1418 case FIOGETOWN: 1419 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1420 /* Not allowed to set ownership. */ 1421 return (ENOTTY); 1422 1423 /* Get ownership. */ 1424 *(int *)data = fgetown(&tp->t_sigio); 1425 return (0); 1426 case TIOCGETA: 1427 /* Obtain terminal flags through tcgetattr(). */ 1428 *(struct termios*)data = tp->t_termios; 1429 return (0); 1430 case TIOCSETA: 1431 case TIOCSETAW: 1432 case TIOCSETAF: { 1433 struct termios *t = data; 1434 1435 /* 1436 * Who makes up these funny rules? According to POSIX, 1437 * input baud rate is set equal to the output baud rate 1438 * when zero. 1439 */ 1440 if (t->c_ispeed == 0) 1441 t->c_ispeed = t->c_ospeed; 1442 1443 /* Discard any unsupported bits. */ 1444 t->c_iflag &= TTYSUP_IFLAG; 1445 t->c_oflag &= TTYSUP_OFLAG; 1446 t->c_lflag &= TTYSUP_LFLAG; 1447 t->c_cflag &= TTYSUP_CFLAG; 1448 1449 /* Set terminal flags through tcsetattr(). */ 1450 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1451 error = tty_drain(tp); 1452 if (error) 1453 return (error); 1454 if (cmd == TIOCSETAF) 1455 tty_flush(tp, FREAD); 1456 } 1457 1458 /* 1459 * Only call param() when the flags really change. 1460 */ 1461 if ((t->c_cflag & CIGNORE) == 0 && 1462 (tp->t_termios.c_cflag != t->c_cflag || 1463 tp->t_termios.c_ispeed != t->c_ispeed || 1464 tp->t_termios.c_ospeed != t->c_ospeed)) { 1465 error = ttydevsw_param(tp, t); 1466 if (error) 1467 return (error); 1468 1469 /* XXX: CLOCAL? */ 1470 1471 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE; 1472 tp->t_termios.c_ispeed = t->c_ispeed; 1473 tp->t_termios.c_ospeed = t->c_ospeed; 1474 1475 /* Baud rate has changed - update watermarks. */ 1476 tty_watermarks(tp); 1477 } 1478 1479 /* Copy new non-device driver parameters. */ 1480 tp->t_termios.c_iflag = t->c_iflag; 1481 tp->t_termios.c_oflag = t->c_oflag; 1482 tp->t_termios.c_lflag = t->c_lflag; 1483 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc); 1484 1485 ttydisc_optimize(tp); 1486 1487 if ((t->c_lflag & ICANON) == 0) { 1488 /* 1489 * When in non-canonical mode, wake up all 1490 * readers. Canonicalize any partial input. VMIN 1491 * and VTIME could also be adjusted. 1492 */ 1493 ttyinq_canonicalize(&tp->t_inq); 1494 tty_wakeup(tp, FREAD); 1495 } 1496 1497 /* 1498 * For packet mode: notify the PTY consumer that VSTOP 1499 * and VSTART may have been changed. 1500 */ 1501 if (tp->t_termios.c_iflag & IXON && 1502 tp->t_termios.c_cc[VSTOP] == CTRL('S') && 1503 tp->t_termios.c_cc[VSTART] == CTRL('Q')) 1504 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP); 1505 else 1506 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP); 1507 return (0); 1508 } 1509 case TIOCGETD: 1510 /* For compatibility - we only support TTYDISC. */ 1511 *(int *)data = TTYDISC; 1512 return (0); 1513 case TIOCGPGRP: 1514 if (!tty_is_ctty(tp, td->td_proc)) 1515 return (ENOTTY); 1516 1517 if (tp->t_pgrp != NULL) 1518 *(int *)data = tp->t_pgrp->pg_id; 1519 else 1520 *(int *)data = NO_PID; 1521 return (0); 1522 case TIOCGSID: 1523 if (!tty_is_ctty(tp, td->td_proc)) 1524 return (ENOTTY); 1525 1526 MPASS(tp->t_session); 1527 *(int *)data = tp->t_session->s_sid; 1528 return (0); 1529 case TIOCSCTTY: { 1530 struct proc *p = td->td_proc; 1531 1532 /* XXX: This looks awful. */ 1533 tty_unlock(tp); 1534 sx_xlock(&proctree_lock); 1535 tty_lock(tp); 1536 1537 if (!SESS_LEADER(p)) { 1538 /* Only the session leader may do this. */ 1539 sx_xunlock(&proctree_lock); 1540 return (EPERM); 1541 } 1542 1543 if (tp->t_session != NULL && tp->t_session == p->p_session) { 1544 /* This is already our controlling TTY. */ 1545 sx_xunlock(&proctree_lock); 1546 return (0); 1547 } 1548 1549 if (p->p_session->s_ttyp != NULL || 1550 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL && 1551 tp->t_session->s_ttyvp->v_type != VBAD)) { 1552 /* 1553 * There is already a relation between a TTY and 1554 * a session, or the caller is not the session 1555 * leader. 1556 * 1557 * Allow the TTY to be stolen when the vnode is 1558 * invalid, but the reference to the TTY is 1559 * still active. This allows immediate reuse of 1560 * TTYs of which the session leader has been 1561 * killed or the TTY revoked. 1562 */ 1563 sx_xunlock(&proctree_lock); 1564 return (EPERM); 1565 } 1566 1567 /* Connect the session to the TTY. */ 1568 tp->t_session = p->p_session; 1569 tp->t_session->s_ttyp = tp; 1570 tp->t_sessioncnt++; 1571 sx_xunlock(&proctree_lock); 1572 1573 /* Assign foreground process group. */ 1574 tp->t_pgrp = p->p_pgrp; 1575 PROC_LOCK(p); 1576 p->p_flag |= P_CONTROLT; 1577 PROC_UNLOCK(p); 1578 1579 return (0); 1580 } 1581 case TIOCSPGRP: { 1582 struct pgrp *pg; 1583 1584 /* 1585 * XXX: Temporarily unlock the TTY to locate the process 1586 * group. This code would be lot nicer if we would ever 1587 * decompose proctree_lock. 1588 */ 1589 tty_unlock(tp); 1590 sx_slock(&proctree_lock); 1591 pg = pgfind(*(int *)data); 1592 if (pg != NULL) 1593 PGRP_UNLOCK(pg); 1594 if (pg == NULL || pg->pg_session != td->td_proc->p_session) { 1595 sx_sunlock(&proctree_lock); 1596 tty_lock(tp); 1597 return (EPERM); 1598 } 1599 tty_lock(tp); 1600 1601 /* 1602 * Determine if this TTY is the controlling TTY after 1603 * relocking the TTY. 1604 */ 1605 if (!tty_is_ctty(tp, td->td_proc)) { 1606 sx_sunlock(&proctree_lock); 1607 return (ENOTTY); 1608 } 1609 tp->t_pgrp = pg; 1610 sx_sunlock(&proctree_lock); 1611 1612 /* Wake up the background process groups. */ 1613 cv_broadcast(&tp->t_bgwait); 1614 return (0); 1615 } 1616 case TIOCFLUSH: { 1617 int flags = *(int *)data; 1618 1619 if (flags == 0) 1620 flags = (FREAD|FWRITE); 1621 else 1622 flags &= (FREAD|FWRITE); 1623 tty_flush(tp, flags); 1624 return (0); 1625 } 1626 case TIOCDRAIN: 1627 /* Drain TTY output. */ 1628 return tty_drain(tp); 1629 case TIOCCONS: 1630 /* Set terminal as console TTY. */ 1631 if (*(int *)data) { 1632 error = priv_check(td, PRIV_TTY_CONSOLE); 1633 if (error) 1634 return (error); 1635 1636 /* 1637 * XXX: constty should really need to be locked! 1638 * XXX: allow disconnected constty's to be stolen! 1639 */ 1640 1641 if (constty == tp) 1642 return (0); 1643 if (constty != NULL) 1644 return (EBUSY); 1645 1646 tty_unlock(tp); 1647 constty_set(tp); 1648 tty_lock(tp); 1649 } else if (constty == tp) { 1650 constty_clear(); 1651 } 1652 return (0); 1653 case TIOCGWINSZ: 1654 /* Obtain window size. */ 1655 *(struct winsize*)data = tp->t_winsize; 1656 return (0); 1657 case TIOCSWINSZ: 1658 /* Set window size. */ 1659 if (bcmp(&tp->t_winsize, data, sizeof(struct winsize)) == 0) 1660 return (0); 1661 tp->t_winsize = *(struct winsize*)data; 1662 tty_signal_pgrp(tp, SIGWINCH); 1663 return (0); 1664 case TIOCEXCL: 1665 tp->t_flags |= TF_EXCLUDE; 1666 return (0); 1667 case TIOCNXCL: 1668 tp->t_flags &= ~TF_EXCLUDE; 1669 return (0); 1670 case TIOCSTOP: 1671 tp->t_flags |= TF_STOPPED; 1672 ttydevsw_pktnotify(tp, TIOCPKT_STOP); 1673 return (0); 1674 case TIOCSTART: 1675 tp->t_flags &= ~TF_STOPPED; 1676 ttydevsw_outwakeup(tp); 1677 ttydevsw_pktnotify(tp, TIOCPKT_START); 1678 return (0); 1679 case TIOCSTAT: 1680 tty_info(tp); 1681 return (0); 1682 case TIOCSTI: 1683 if ((fflag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI)) 1684 return (EPERM); 1685 if (!tty_is_ctty(tp, td->td_proc) && 1686 priv_check(td, PRIV_TTY_STI)) 1687 return (EACCES); 1688 ttydisc_rint(tp, *(char *)data, 0); 1689 ttydisc_rint_done(tp); 1690 return (0); 1691 } 1692 1693#ifdef COMPAT_43TTY 1694 return tty_ioctl_compat(tp, cmd, data, fflag, td); 1695#else /* !COMPAT_43TTY */ 1696 return (ENOIOCTL); 1697#endif /* COMPAT_43TTY */ 1698} 1699 1700int 1701tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, struct thread *td) 1702{ 1703 int error; 1704 1705 tty_lock_assert(tp, MA_OWNED); 1706 1707 if (tty_gone(tp)) 1708 return (ENXIO); 1709 1710 error = ttydevsw_ioctl(tp, cmd, data, td); 1711 if (error == ENOIOCTL) 1712 error = tty_generic_ioctl(tp, cmd, data, fflag, td); 1713 1714 return (error); 1715} 1716 1717dev_t 1718tty_udev(struct tty *tp) 1719{ 1720 if (tp->t_dev) 1721 return dev2udev(tp->t_dev); 1722 else 1723 return NODEV; 1724} 1725 1726int 1727tty_checkoutq(struct tty *tp) 1728{ 1729 1730 /* 256 bytes should be enough to print a log message. */ 1731 return (ttyoutq_bytesleft(&tp->t_outq) >= 256); 1732} 1733 1734void 1735tty_hiwat_in_block(struct tty *tp) 1736{ 1737 1738 if ((tp->t_flags & TF_HIWAT_IN) == 0 && 1739 tp->t_termios.c_iflag & IXOFF && 1740 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) { 1741 /* 1742 * Input flow control. Only enter the high watermark when we 1743 * can successfully store the VSTOP character. 1744 */ 1745 if (ttyoutq_write_nofrag(&tp->t_outq, 1746 &tp->t_termios.c_cc[VSTOP], 1) == 0) 1747 tp->t_flags |= TF_HIWAT_IN; 1748 } else { 1749 /* No input flow control. */ 1750 tp->t_flags |= TF_HIWAT_IN; 1751 } 1752} 1753 1754void 1755tty_hiwat_in_unblock(struct tty *tp) 1756{ 1757 1758 if (tp->t_flags & TF_HIWAT_IN && 1759 tp->t_termios.c_iflag & IXOFF && 1760 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) { 1761 /* 1762 * Input flow control. Only leave the high watermark when we 1763 * can successfully store the VSTART character. 1764 */ 1765 if (ttyoutq_write_nofrag(&tp->t_outq, 1766 &tp->t_termios.c_cc[VSTART], 1) == 0) 1767 tp->t_flags &= ~TF_HIWAT_IN; 1768 } else { 1769 /* No input flow control. */ 1770 tp->t_flags &= ~TF_HIWAT_IN; 1771 } 1772 1773 if (!tty_gone(tp)) 1774 ttydevsw_inwakeup(tp); 1775} 1776 1777/* 1778 * TTY hooks interface. 1779 */ 1780 1781static int 1782ttyhook_defrint(struct tty *tp, char c, int flags) 1783{ 1784 1785 if (ttyhook_rint_bypass(tp, &c, 1) != 1) 1786 return (-1); 1787 1788 return (0); 1789} 1790 1791int 1792ttyhook_register(struct tty **rtp, struct proc *p, int fd, 1793 struct ttyhook *th, void *softc) 1794{ 1795 struct tty *tp; 1796 struct file *fp; 1797 struct cdev *dev; 1798 struct cdevsw *cdp; 1799 struct filedesc *fdp; 1800 int error; 1801 1802 /* Validate the file descriptor. */ 1803 if ((fdp = p->p_fd) == NULL) 1804 return (EBADF); 1805 1806 fp = fget_unlocked(fdp, fd); 1807 if (fp == NULL) 1808 return (EBADF); 1809 if (fp->f_ops == &badfileops) { 1810 error = EBADF; 1811 goto done1; 1812 } 1813 1814 /* 1815 * Make sure the vnode is bound to a character device. 1816 * Unlocked check for the vnode type is ok there, because we 1817 * only shall prevent calling devvn_refthread on the file that 1818 * never has been opened over a character device. 1819 */ 1820 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) { 1821 error = EINVAL; 1822 goto done1; 1823 } 1824 1825 /* Make sure it is a TTY. */ 1826 cdp = devvn_refthread(fp->f_vnode, &dev); 1827 if (cdp == NULL) { 1828 error = ENXIO; 1829 goto done1; 1830 } 1831 if (dev != fp->f_data) { 1832 error = ENXIO; 1833 goto done2; 1834 } 1835 if (cdp != &ttydev_cdevsw) { 1836 error = ENOTTY; 1837 goto done2; 1838 } 1839 tp = dev->si_drv1; 1840 1841 /* Try to attach the hook to the TTY. */ 1842 error = EBUSY; 1843 tty_lock(tp); 1844 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0)); 1845 if (tp->t_flags & TF_HOOK) 1846 goto done3; 1847 1848 tp->t_flags |= TF_HOOK; 1849 tp->t_hook = th; 1850 tp->t_hooksoftc = softc; 1851 *rtp = tp; 1852 error = 0; 1853 1854 /* Maybe we can switch into bypass mode now. */ 1855 ttydisc_optimize(tp); 1856 1857 /* Silently convert rint() calls to rint_bypass() when possible. */ 1858 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass)) 1859 th->th_rint = ttyhook_defrint; 1860 1861done3: tty_unlock(tp); 1862done2: dev_relthread(dev); 1863done1: fdrop(fp, curthread); 1864 return (error); 1865} 1866 1867void 1868ttyhook_unregister(struct tty *tp) 1869{ 1870 1871 tty_lock_assert(tp, MA_OWNED); 1872 MPASS(tp->t_flags & TF_HOOK); 1873 1874 /* Disconnect the hook. */ 1875 tp->t_flags &= ~TF_HOOK; 1876 tp->t_hook = NULL; 1877 1878 /* Maybe we need to leave bypass mode. */ 1879 ttydisc_optimize(tp); 1880 1881 /* Maybe deallocate the TTY as well. */ 1882 tty_rel_free(tp); 1883} 1884 1885/* 1886 * /dev/console handling. 1887 */ 1888 1889static int 1890ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 1891{ 1892 struct tty *tp; 1893 1894 /* System has no console device. */ 1895 if (dev_console_filename == NULL) 1896 return (ENXIO); 1897 1898 /* Look up corresponding TTY by device name. */ 1899 sx_slock(&tty_list_sx); 1900 TAILQ_FOREACH(tp, &tty_list, t_list) { 1901 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) { 1902 dev_console->si_drv1 = tp; 1903 break; 1904 } 1905 } 1906 sx_sunlock(&tty_list_sx); 1907 1908 /* System console has no TTY associated. */ 1909 if (dev_console->si_drv1 == NULL) 1910 return (ENXIO); 1911 1912 return (ttydev_open(dev, oflags, devtype, td)); 1913} 1914 1915static int 1916ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag) 1917{ 1918 1919 log_console(uio); 1920 1921 return (ttydev_write(dev, uio, ioflag)); 1922} 1923 1924/* 1925 * /dev/console is a little different than normal TTY's. When opened, 1926 * it determines which TTY to use. When data gets written to it, it 1927 * will be logged in the kernel message buffer. 1928 */ 1929static struct cdevsw ttyconsdev_cdevsw = { 1930 .d_version = D_VERSION, 1931 .d_open = ttyconsdev_open, 1932 .d_close = ttydev_close, 1933 .d_read = ttydev_read, 1934 .d_write = ttyconsdev_write, 1935 .d_ioctl = ttydev_ioctl, 1936 .d_kqfilter = ttydev_kqfilter, 1937 .d_poll = ttydev_poll, 1938 .d_mmap = ttydev_mmap, 1939 .d_name = "ttyconsdev", 1940 .d_flags = D_TTY, 1941}; 1942 1943static void 1944ttyconsdev_init(void *unused) 1945{ 1946 1947 dev_console = make_dev(&ttyconsdev_cdevsw, 0, UID_ROOT, GID_WHEEL, 1948 0600, "console"); 1949} 1950 1951SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL); 1952 1953void 1954ttyconsdev_select(const char *name) 1955{ 1956 1957 dev_console_filename = name; 1958} 1959 1960/* 1961 * Debugging routines. 1962 */ 1963 1964#include "opt_ddb.h" 1965#ifdef DDB 1966#include <ddb/ddb.h> 1967#include <ddb/db_sym.h> 1968 1969static struct { 1970 int flag; 1971 char val; 1972} ttystates[] = { 1973#if 0 1974 { TF_NOPREFIX, 'N' }, 1975#endif 1976 { TF_INITLOCK, 'I' }, 1977 { TF_CALLOUT, 'C' }, 1978 1979 /* Keep these together -> 'Oi' and 'Oo'. */ 1980 { TF_OPENED, 'O' }, 1981 { TF_OPENED_IN, 'i' }, 1982 { TF_OPENED_OUT, 'o' }, 1983 { TF_OPENED_CONS, 'c' }, 1984 1985 { TF_GONE, 'G' }, 1986 { TF_OPENCLOSE, 'B' }, 1987 { TF_ASYNC, 'Y' }, 1988 { TF_LITERAL, 'L' }, 1989 1990 /* Keep these together -> 'Hi' and 'Ho'. */ 1991 { TF_HIWAT, 'H' }, 1992 { TF_HIWAT_IN, 'i' }, 1993 { TF_HIWAT_OUT, 'o' }, 1994 1995 { TF_STOPPED, 'S' }, 1996 { TF_EXCLUDE, 'X' }, 1997 { TF_BYPASS, 'l' }, 1998 { TF_ZOMBIE, 'Z' }, 1999 { TF_HOOK, 's' }, 2000 2001 /* Keep these together -> 'bi' and 'bo'. */ 2002 { TF_BUSY, 'b' }, 2003 { TF_BUSY_IN, 'i' }, 2004 { TF_BUSY_OUT, 'o' }, 2005 2006 { 0, '\0'}, 2007}; 2008 2009#define TTY_FLAG_BITS \ 2010 "\20\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \ 2011 "\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \ 2012 "\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK" 2013 2014#define DB_PRINTSYM(name, addr) \ 2015 db_printf("%s " #name ": ", sep); \ 2016 db_printsym((db_addr_t) addr, DB_STGY_ANY); \ 2017 db_printf("\n"); 2018 2019static void 2020_db_show_devsw(const char *sep, const struct ttydevsw *tsw) 2021{ 2022 db_printf("%sdevsw: ", sep); 2023 db_printsym((db_addr_t)tsw, DB_STGY_ANY); 2024 db_printf(" (%p)\n", tsw); 2025 DB_PRINTSYM(open, tsw->tsw_open); 2026 DB_PRINTSYM(close, tsw->tsw_close); 2027 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup); 2028 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup); 2029 DB_PRINTSYM(ioctl, tsw->tsw_ioctl); 2030 DB_PRINTSYM(param, tsw->tsw_param); 2031 DB_PRINTSYM(modem, tsw->tsw_modem); 2032 DB_PRINTSYM(mmap, tsw->tsw_mmap); 2033 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify); 2034 DB_PRINTSYM(free, tsw->tsw_free); 2035} 2036static void 2037_db_show_hooks(const char *sep, const struct ttyhook *th) 2038{ 2039 db_printf("%shook: ", sep); 2040 db_printsym((db_addr_t)th, DB_STGY_ANY); 2041 db_printf(" (%p)\n", th); 2042 if (th == NULL) 2043 return; 2044 DB_PRINTSYM(rint, th->th_rint); 2045 DB_PRINTSYM(rint_bypass, th->th_rint_bypass); 2046 DB_PRINTSYM(rint_done, th->th_rint_done); 2047 DB_PRINTSYM(rint_poll, th->th_rint_poll); 2048 DB_PRINTSYM(getc_inject, th->th_getc_inject); 2049 DB_PRINTSYM(getc_capture, th->th_getc_capture); 2050 DB_PRINTSYM(getc_poll, th->th_getc_poll); 2051 DB_PRINTSYM(close, th->th_close); 2052} 2053 2054static void 2055_db_show_termios(const char *name, const struct termios *t) 2056{ 2057 2058 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x " 2059 "lflag 0x%x ispeed %u ospeed %u\n", name, 2060 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag, 2061 t->c_ispeed, t->c_ospeed); 2062} 2063 2064/* DDB command to show TTY statistics. */ 2065DB_SHOW_COMMAND(tty, db_show_tty) 2066{ 2067 struct tty *tp; 2068 2069 if (!have_addr) { 2070 db_printf("usage: show tty <addr>\n"); 2071 return; 2072 } 2073 tp = (struct tty *)addr; 2074 2075 db_printf("0x%p: %s\n", tp, tty_devname(tp)); 2076 db_printf("\tmtx: %p\n", tp->t_mtx); 2077 db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS); 2078 db_printf("\trevokecnt: %u\n", tp->t_revokecnt); 2079 2080 /* Buffering mechanisms. */ 2081 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u " 2082 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin, 2083 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end, 2084 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota); 2085 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n", 2086 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end, 2087 tp->t_outq.to_nblocks, tp->t_outq.to_quota); 2088 db_printf("\tinlow: %zu\n", tp->t_inlow); 2089 db_printf("\toutlow: %zu\n", tp->t_outlow); 2090 _db_show_termios("\ttermios", &tp->t_termios); 2091 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n", 2092 tp->t_winsize.ws_row, tp->t_winsize.ws_col, 2093 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel); 2094 db_printf("\tcolumn: %u\n", tp->t_column); 2095 db_printf("\twritepos: %u\n", tp->t_writepos); 2096 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags); 2097 2098 /* Init/lock-state devices. */ 2099 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in); 2100 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out); 2101 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in); 2102 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out); 2103 2104 /* Hooks */ 2105 _db_show_devsw("\t", tp->t_devsw); 2106 _db_show_hooks("\t", tp->t_hook); 2107 2108 /* Process info. */ 2109 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp, 2110 tp->t_pgrp ? tp->t_pgrp->pg_id : 0, 2111 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0); 2112 db_printf("\tsession: %p", tp->t_session); 2113 if (tp->t_session != NULL) 2114 db_printf(" count %u leader %p tty %p sid %d login %s", 2115 tp->t_session->s_count, tp->t_session->s_leader, 2116 tp->t_session->s_ttyp, tp->t_session->s_sid, 2117 tp->t_session->s_login); 2118 db_printf("\n"); 2119 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt); 2120 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc); 2121 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc); 2122 db_printf("\tdev: %p\n", tp->t_dev); 2123} 2124 2125/* DDB command to list TTYs. */ 2126DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys) 2127{ 2128 struct tty *tp; 2129 size_t isiz, osiz; 2130 int i, j; 2131 2132 /* Make the output look like `pstat -t'. */ 2133 db_printf("PTR "); 2134#if defined(__LP64__) 2135 db_printf(" "); 2136#endif 2137 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW " 2138 "COL SESS PGID STATE\n"); 2139 2140 TAILQ_FOREACH(tp, &tty_list, t_list) { 2141 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE; 2142 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE; 2143 2144 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ", 2145 tp, 2146 tty_devname(tp), 2147 isiz, 2148 tp->t_inq.ti_linestart - tp->t_inq.ti_begin, 2149 tp->t_inq.ti_end - tp->t_inq.ti_linestart, 2150 isiz - tp->t_inlow, 2151 osiz, 2152 tp->t_outq.to_end - tp->t_outq.to_begin, 2153 osiz - tp->t_outlow, 2154 MIN(tp->t_column, 99999), 2155 tp->t_session ? tp->t_session->s_sid : 0, 2156 tp->t_pgrp ? tp->t_pgrp->pg_id : 0); 2157 2158 /* Flag bits. */ 2159 for (i = j = 0; ttystates[i].flag; i++) 2160 if (tp->t_flags & ttystates[i].flag) { 2161 db_printf("%c", ttystates[i].val); 2162 j++; 2163 } 2164 if (j == 0) 2165 db_printf("-"); 2166 db_printf("\n"); 2167 } 2168} 2169#endif /* DDB */ 2170