tty.c revision 199998
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 199998 2009-12-01 19:14:57Z 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 TIOCSTOP: 509 case TIOCSWINSZ: 510#if 0 511 case TIOCSDRAINWAIT: 512 case TIOCSETD: 513 case TIOCSTI: 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, 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_offset_t offset, vm_paddr_t *paddr, int nprot) 607{ 608 struct tty *tp = dev->si_drv1; 609 int error; 610 611 /* Handle mmap() through the driver. */ 612 613 error = ttydev_enter(tp); 614 if (error) 615 return (-1); 616 error = ttydevsw_mmap(tp, offset, paddr, nprot); 617 tty_unlock(tp); 618 619 return (error); 620} 621 622/* 623 * kqueue support. 624 */ 625 626static void 627tty_kqops_read_detach(struct knote *kn) 628{ 629 struct tty *tp = kn->kn_hook; 630 631 knlist_remove(&tp->t_inpoll.si_note, kn, 0); 632} 633 634static int 635tty_kqops_read_event(struct knote *kn, long hint) 636{ 637 struct tty *tp = kn->kn_hook; 638 639 tty_lock_assert(tp, MA_OWNED); 640 641 if (tty_gone(tp) || tp->t_flags & TF_ZOMBIE) { 642 kn->kn_flags |= EV_EOF; 643 return (1); 644 } else { 645 kn->kn_data = ttydisc_read_poll(tp); 646 return (kn->kn_data > 0); 647 } 648} 649 650static void 651tty_kqops_write_detach(struct knote *kn) 652{ 653 struct tty *tp = kn->kn_hook; 654 655 knlist_remove(&tp->t_outpoll.si_note, kn, 0); 656} 657 658static int 659tty_kqops_write_event(struct knote *kn, long hint) 660{ 661 struct tty *tp = kn->kn_hook; 662 663 tty_lock_assert(tp, MA_OWNED); 664 665 if (tty_gone(tp)) { 666 kn->kn_flags |= EV_EOF; 667 return (1); 668 } else { 669 kn->kn_data = ttydisc_write_poll(tp); 670 return (kn->kn_data > 0); 671 } 672} 673 674static struct filterops tty_kqops_read = { 675 .f_isfd = 1, 676 .f_detach = tty_kqops_read_detach, 677 .f_event = tty_kqops_read_event, 678}; 679static struct filterops tty_kqops_write = { 680 .f_isfd = 1, 681 .f_detach = tty_kqops_write_detach, 682 .f_event = tty_kqops_write_event, 683}; 684 685static int 686ttydev_kqfilter(struct cdev *dev, struct knote *kn) 687{ 688 struct tty *tp = dev->si_drv1; 689 int error; 690 691 error = ttydev_enter(tp); 692 if (error) 693 return (error); 694 695 switch (kn->kn_filter) { 696 case EVFILT_READ: 697 kn->kn_hook = tp; 698 kn->kn_fop = &tty_kqops_read; 699 knlist_add(&tp->t_inpoll.si_note, kn, 1); 700 break; 701 case EVFILT_WRITE: 702 kn->kn_hook = tp; 703 kn->kn_fop = &tty_kqops_write; 704 knlist_add(&tp->t_outpoll.si_note, kn, 1); 705 break; 706 default: 707 error = EINVAL; 708 break; 709 } 710 711 tty_unlock(tp); 712 return (error); 713} 714 715static struct cdevsw ttydev_cdevsw = { 716 .d_version = D_VERSION, 717 .d_open = ttydev_open, 718 .d_close = ttydev_close, 719 .d_read = ttydev_read, 720 .d_write = ttydev_write, 721 .d_ioctl = ttydev_ioctl, 722 .d_kqfilter = ttydev_kqfilter, 723 .d_poll = ttydev_poll, 724 .d_mmap = ttydev_mmap, 725 .d_name = "ttydev", 726 .d_flags = D_TTY, 727}; 728 729/* 730 * Init/lock-state devices 731 */ 732 733static int 734ttyil_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 735{ 736 struct tty *tp = dev->si_drv1; 737 int error = 0; 738 739 tty_lock(tp); 740 if (tty_gone(tp)) 741 error = ENODEV; 742 tty_unlock(tp); 743 744 return (error); 745} 746 747static int 748ttyil_close(struct cdev *dev, int flag, int mode, struct thread *td) 749{ 750 return (0); 751} 752 753static int 754ttyil_rdwr(struct cdev *dev, struct uio *uio, int ioflag) 755{ 756 return (ENODEV); 757} 758 759static int 760ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 761 struct thread *td) 762{ 763 struct tty *tp = dev->si_drv1; 764 int error = 0; 765 766 tty_lock(tp); 767 if (tty_gone(tp)) { 768 error = ENODEV; 769 goto done; 770 } 771 772 switch (cmd) { 773 case TIOCGETA: 774 /* Obtain terminal flags through tcgetattr(). */ 775 *(struct termios*)data = *(struct termios*)dev->si_drv2; 776 break; 777 case TIOCSETA: 778 /* Set terminal flags through tcsetattr(). */ 779 error = priv_check(td, PRIV_TTY_SETA); 780 if (error) 781 break; 782 *(struct termios*)dev->si_drv2 = *(struct termios*)data; 783 break; 784 case TIOCGETD: 785 *(int *)data = TTYDISC; 786 break; 787 case TIOCGWINSZ: 788 bzero(data, sizeof(struct winsize)); 789 break; 790 default: 791 error = ENOTTY; 792 } 793 794done: tty_unlock(tp); 795 return (error); 796} 797 798static struct cdevsw ttyil_cdevsw = { 799 .d_version = D_VERSION, 800 .d_open = ttyil_open, 801 .d_close = ttyil_close, 802 .d_read = ttyil_rdwr, 803 .d_write = ttyil_rdwr, 804 .d_ioctl = ttyil_ioctl, 805 .d_name = "ttyil", 806 .d_flags = D_TTY, 807}; 808 809static void 810tty_init_termios(struct tty *tp) 811{ 812 struct termios *t = &tp->t_termios_init_in; 813 814 t->c_cflag = TTYDEF_CFLAG; 815 t->c_iflag = TTYDEF_IFLAG; 816 t->c_lflag = TTYDEF_LFLAG; 817 t->c_oflag = TTYDEF_OFLAG; 818 t->c_ispeed = TTYDEF_SPEED; 819 t->c_ospeed = TTYDEF_SPEED; 820 memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars); 821 822 tp->t_termios_init_out = *t; 823} 824 825void 826tty_init_console(struct tty *tp, speed_t s) 827{ 828 struct termios *ti = &tp->t_termios_init_in; 829 struct termios *to = &tp->t_termios_init_out; 830 831 if (s != 0) { 832 ti->c_ispeed = ti->c_ospeed = s; 833 to->c_ispeed = to->c_ospeed = s; 834 } 835 836 ti->c_cflag |= CLOCAL; 837 to->c_cflag |= CLOCAL; 838} 839 840/* 841 * Standard device routine implementations, mostly meant for 842 * pseudo-terminal device drivers. When a driver creates a new terminal 843 * device class, missing routines are patched. 844 */ 845 846static int 847ttydevsw_defopen(struct tty *tp) 848{ 849 850 return (0); 851} 852 853static void 854ttydevsw_defclose(struct tty *tp) 855{ 856} 857 858static void 859ttydevsw_defoutwakeup(struct tty *tp) 860{ 861 862 panic("Terminal device has output, while not implemented"); 863} 864 865static void 866ttydevsw_definwakeup(struct tty *tp) 867{ 868} 869 870static int 871ttydevsw_defioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td) 872{ 873 874 return (ENOIOCTL); 875} 876 877static int 878ttydevsw_defparam(struct tty *tp, struct termios *t) 879{ 880 881 /* 882 * Allow the baud rate to be adjusted for pseudo-devices, but at 883 * least restrict it to 115200 to prevent excessive buffer 884 * usage. Also disallow 0, to prevent foot shooting. 885 */ 886 if (t->c_ispeed < B50) 887 t->c_ispeed = B50; 888 else if (t->c_ispeed > B115200) 889 t->c_ispeed = B115200; 890 if (t->c_ospeed < B50) 891 t->c_ospeed = B50; 892 else if (t->c_ospeed > B115200) 893 t->c_ospeed = B115200; 894 t->c_cflag |= CREAD; 895 896 return (0); 897} 898 899static int 900ttydevsw_defmodem(struct tty *tp, int sigon, int sigoff) 901{ 902 903 /* Simulate a carrier to make the TTY layer happy. */ 904 return (SER_DCD); 905} 906 907static int 908ttydevsw_defmmap(struct tty *tp, vm_offset_t offset, vm_paddr_t *paddr, 909 int nprot) 910{ 911 912 return (-1); 913} 914 915static void 916ttydevsw_defpktnotify(struct tty *tp, char event) 917{ 918} 919 920static void 921ttydevsw_deffree(void *softc) 922{ 923 924 panic("Terminal device freed without a free-handler"); 925} 926 927/* 928 * TTY allocation and deallocation. TTY devices can be deallocated when 929 * the driver doesn't use it anymore, when the TTY isn't a session's 930 * controlling TTY and when the device node isn't opened through devfs. 931 */ 932 933struct tty * 934tty_alloc(struct ttydevsw *tsw, void *sc) 935{ 936 937 return (tty_alloc_mutex(tsw, sc, NULL)); 938} 939 940struct tty * 941tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex) 942{ 943 struct tty *tp; 944 945 /* Make sure the driver defines all routines. */ 946#define PATCH_FUNC(x) do { \ 947 if (tsw->tsw_ ## x == NULL) \ 948 tsw->tsw_ ## x = ttydevsw_def ## x; \ 949} while (0) 950 PATCH_FUNC(open); 951 PATCH_FUNC(close); 952 PATCH_FUNC(outwakeup); 953 PATCH_FUNC(inwakeup); 954 PATCH_FUNC(ioctl); 955 PATCH_FUNC(param); 956 PATCH_FUNC(modem); 957 PATCH_FUNC(mmap); 958 PATCH_FUNC(pktnotify); 959 PATCH_FUNC(free); 960#undef PATCH_FUNC 961 962 tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO); 963 tp->t_devsw = tsw; 964 tp->t_devswsoftc = sc; 965 tp->t_flags = tsw->tsw_flags; 966 967 tty_init_termios(tp); 968 969 cv_init(&tp->t_inwait, "ttyin"); 970 cv_init(&tp->t_outwait, "ttyout"); 971 cv_init(&tp->t_outserwait, "ttyosr"); 972 cv_init(&tp->t_bgwait, "ttybg"); 973 cv_init(&tp->t_dcdwait, "ttydcd"); 974 975 /* Allow drivers to use a custom mutex to lock the TTY. */ 976 if (mutex != NULL) { 977 tp->t_mtx = mutex; 978 } else { 979 tp->t_mtx = &tp->t_mtxobj; 980 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF); 981 } 982 983 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx); 984 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx); 985 986 sx_xlock(&tty_list_sx); 987 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 988 tty_list_count++; 989 sx_xunlock(&tty_list_sx); 990 991 return (tp); 992} 993 994static void 995tty_dealloc(void *arg) 996{ 997 struct tty *tp = arg; 998 999 sx_xlock(&tty_list_sx); 1000 TAILQ_REMOVE(&tty_list, tp, t_list); 1001 tty_list_count--; 1002 sx_xunlock(&tty_list_sx); 1003 1004 /* Make sure we haven't leaked buffers. */ 1005 MPASS(ttyinq_getsize(&tp->t_inq) == 0); 1006 MPASS(ttyoutq_getsize(&tp->t_outq) == 0); 1007 1008 knlist_destroy(&tp->t_inpoll.si_note); 1009 knlist_destroy(&tp->t_outpoll.si_note); 1010 1011 cv_destroy(&tp->t_inwait); 1012 cv_destroy(&tp->t_outwait); 1013 cv_destroy(&tp->t_bgwait); 1014 cv_destroy(&tp->t_dcdwait); 1015 cv_destroy(&tp->t_outserwait); 1016 1017 if (tp->t_mtx == &tp->t_mtxobj) 1018 mtx_destroy(&tp->t_mtxobj); 1019 ttydevsw_free(tp); 1020 free(tp, M_TTY); 1021} 1022 1023static void 1024tty_rel_free(struct tty *tp) 1025{ 1026 struct cdev *dev; 1027 1028 tty_lock_assert(tp, MA_OWNED); 1029 1030#define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE) 1031 if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) { 1032 /* TTY is still in use. */ 1033 tty_unlock(tp); 1034 return; 1035 } 1036 1037 /* TTY can be deallocated. */ 1038 dev = tp->t_dev; 1039 tp->t_dev = NULL; 1040 tty_unlock(tp); 1041 1042 destroy_dev_sched_cb(dev, tty_dealloc, tp); 1043} 1044 1045void 1046tty_rel_pgrp(struct tty *tp, struct pgrp *pg) 1047{ 1048 MPASS(tp->t_sessioncnt > 0); 1049 tty_lock_assert(tp, MA_OWNED); 1050 1051 if (tp->t_pgrp == pg) 1052 tp->t_pgrp = NULL; 1053 1054 tty_unlock(tp); 1055} 1056 1057void 1058tty_rel_sess(struct tty *tp, struct session *sess) 1059{ 1060 MPASS(tp->t_sessioncnt > 0); 1061 1062 /* Current session has left. */ 1063 if (tp->t_session == sess) { 1064 tp->t_session = NULL; 1065 MPASS(tp->t_pgrp == NULL); 1066 } 1067 tp->t_sessioncnt--; 1068 tty_rel_free(tp); 1069} 1070 1071void 1072tty_rel_gone(struct tty *tp) 1073{ 1074 MPASS(!tty_gone(tp)); 1075 1076 /* Simulate carrier removal. */ 1077 ttydisc_modem(tp, 0); 1078 1079 /* Wake up all blocked threads. */ 1080 tty_wakeup(tp, FREAD|FWRITE); 1081 cv_broadcast(&tp->t_bgwait); 1082 cv_broadcast(&tp->t_dcdwait); 1083 1084 tp->t_flags |= TF_GONE; 1085 tty_rel_free(tp); 1086} 1087 1088/* 1089 * Exposing information about current TTY's through sysctl 1090 */ 1091 1092static void 1093tty_to_xtty(struct tty *tp, struct xtty *xt) 1094{ 1095 tty_lock_assert(tp, MA_OWNED); 1096 1097 xt->xt_size = sizeof(struct xtty); 1098 xt->xt_insize = ttyinq_getsize(&tp->t_inq); 1099 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq); 1100 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq); 1101 xt->xt_inlow = tp->t_inlow; 1102 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq); 1103 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq); 1104 xt->xt_outlow = tp->t_outlow; 1105 xt->xt_column = tp->t_column; 1106 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1107 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0; 1108 xt->xt_flags = tp->t_flags; 1109 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV; 1110} 1111 1112static int 1113sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 1114{ 1115 unsigned long lsize; 1116 struct xtty *xtlist, *xt; 1117 struct tty *tp; 1118 int error; 1119 1120 sx_slock(&tty_list_sx); 1121 lsize = tty_list_count * sizeof(struct xtty); 1122 if (lsize == 0) { 1123 sx_sunlock(&tty_list_sx); 1124 return (0); 1125 } 1126 1127 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK); 1128 1129 TAILQ_FOREACH(tp, &tty_list, t_list) { 1130 tty_lock(tp); 1131 tty_to_xtty(tp, xt); 1132 tty_unlock(tp); 1133 xt++; 1134 } 1135 sx_sunlock(&tty_list_sx); 1136 1137 error = SYSCTL_OUT(req, xtlist, lsize); 1138 free(xtlist, M_TTY); 1139 return (error); 1140} 1141 1142SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 1143 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs"); 1144 1145/* 1146 * Device node creation. Device has been set up, now we can expose it to 1147 * the user. 1148 */ 1149 1150void 1151tty_makedev(struct tty *tp, struct ucred *cred, const char *fmt, ...) 1152{ 1153 va_list ap; 1154 struct cdev *dev; 1155 const char *prefix = "tty"; 1156 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */ 1157 uid_t uid; 1158 gid_t gid; 1159 mode_t mode; 1160 1161 /* Remove "tty" prefix from devices like PTY's. */ 1162 if (tp->t_flags & TF_NOPREFIX) 1163 prefix = ""; 1164 1165 va_start(ap, fmt); 1166 vsnrprintf(name, sizeof name, 32, fmt, ap); 1167 va_end(ap); 1168 1169 if (cred == NULL) { 1170 /* System device. */ 1171 uid = UID_ROOT; 1172 gid = GID_WHEEL; 1173 mode = S_IRUSR|S_IWUSR; 1174 } else { 1175 /* User device. */ 1176 uid = cred->cr_ruid; 1177 gid = GID_TTY; 1178 mode = S_IRUSR|S_IWUSR|S_IWGRP; 1179 } 1180 1181 /* Master call-in device. */ 1182 dev = make_dev_cred(&ttydev_cdevsw, 0, cred, 1183 uid, gid, mode, "%s%s", prefix, name); 1184 dev->si_drv1 = tp; 1185 tp->t_dev = dev; 1186 1187 /* Slave call-in devices. */ 1188 if (tp->t_flags & TF_INITLOCK) { 1189 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1190 uid, gid, mode, "%s%s.init", prefix, name); 1191 dev_depends(tp->t_dev, dev); 1192 dev->si_drv1 = tp; 1193 dev->si_drv2 = &tp->t_termios_init_in; 1194 1195 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1196 uid, gid, mode, "%s%s.lock", prefix, name); 1197 dev_depends(tp->t_dev, dev); 1198 dev->si_drv1 = tp; 1199 dev->si_drv2 = &tp->t_termios_lock_in; 1200 } 1201 1202 /* Call-out devices. */ 1203 if (tp->t_flags & TF_CALLOUT) { 1204 dev = make_dev_cred(&ttydev_cdevsw, 0, cred, 1205 UID_UUCP, GID_DIALER, 0660, "cua%s", name); 1206 dev_depends(tp->t_dev, dev); 1207 dev->si_drv1 = tp; 1208 1209 /* Slave call-out devices. */ 1210 if (tp->t_flags & TF_INITLOCK) { 1211 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1212 UID_UUCP, GID_DIALER, 0660, "cua%s.init", name); 1213 dev_depends(tp->t_dev, dev); 1214 dev->si_drv1 = tp; 1215 dev->si_drv2 = &tp->t_termios_init_out; 1216 1217 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1218 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", name); 1219 dev_depends(tp->t_dev, dev); 1220 dev->si_drv1 = tp; 1221 dev->si_drv2 = &tp->t_termios_lock_out; 1222 } 1223 } 1224} 1225 1226/* 1227 * Signalling processes. 1228 */ 1229 1230void 1231tty_signal_sessleader(struct tty *tp, int sig) 1232{ 1233 struct proc *p; 1234 1235 tty_lock_assert(tp, MA_OWNED); 1236 MPASS(sig >= 1 && sig < NSIG); 1237 1238 /* Make signals start output again. */ 1239 tp->t_flags &= ~TF_STOPPED; 1240 1241 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) { 1242 p = tp->t_session->s_leader; 1243 PROC_LOCK(p); 1244 psignal(p, sig); 1245 PROC_UNLOCK(p); 1246 } 1247} 1248 1249void 1250tty_signal_pgrp(struct tty *tp, int sig) 1251{ 1252 ksiginfo_t ksi; 1253 1254 tty_lock_assert(tp, MA_OWNED); 1255 MPASS(sig >= 1 && sig < NSIG); 1256 1257 /* Make signals start output again. */ 1258 tp->t_flags &= ~TF_STOPPED; 1259 1260 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO)) 1261 tty_info(tp); 1262 if (tp->t_pgrp != NULL) { 1263 ksiginfo_init(&ksi); 1264 ksi.ksi_signo = sig; 1265 ksi.ksi_code = SI_KERNEL; 1266 PGRP_LOCK(tp->t_pgrp); 1267 pgsignal(tp->t_pgrp, sig, 1, &ksi); 1268 PGRP_UNLOCK(tp->t_pgrp); 1269 } 1270} 1271 1272void 1273tty_wakeup(struct tty *tp, int flags) 1274{ 1275 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL) 1276 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 1277 1278 if (flags & FWRITE) { 1279 cv_broadcast(&tp->t_outwait); 1280 selwakeup(&tp->t_outpoll); 1281 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0); 1282 } 1283 if (flags & FREAD) { 1284 cv_broadcast(&tp->t_inwait); 1285 selwakeup(&tp->t_inpoll); 1286 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0); 1287 } 1288} 1289 1290int 1291tty_wait(struct tty *tp, struct cv *cv) 1292{ 1293 int error; 1294 int revokecnt = tp->t_revokecnt; 1295 1296 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1297 MPASS(!tty_gone(tp)); 1298 1299 error = cv_wait_sig(cv, tp->t_mtx); 1300 1301 /* Restart the system call when we may have been revoked. */ 1302 if (tp->t_revokecnt != revokecnt) 1303 return (ERESTART); 1304 1305 /* Bail out when the device slipped away. */ 1306 if (tty_gone(tp)) 1307 return (ENXIO); 1308 1309 return (error); 1310} 1311 1312int 1313tty_timedwait(struct tty *tp, struct cv *cv, int hz) 1314{ 1315 int error; 1316 int revokecnt = tp->t_revokecnt; 1317 1318 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1319 MPASS(!tty_gone(tp)); 1320 1321 error = cv_timedwait_sig(cv, tp->t_mtx, hz); 1322 1323 /* Restart the system call when we may have been revoked. */ 1324 if (tp->t_revokecnt != revokecnt) 1325 return (ERESTART); 1326 1327 /* Bail out when the device slipped away. */ 1328 if (tty_gone(tp)) 1329 return (ENXIO); 1330 1331 return (error); 1332} 1333 1334void 1335tty_flush(struct tty *tp, int flags) 1336{ 1337 if (flags & FWRITE) { 1338 tp->t_flags &= ~TF_HIWAT_OUT; 1339 ttyoutq_flush(&tp->t_outq); 1340 tty_wakeup(tp, FWRITE); 1341 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE); 1342 } 1343 if (flags & FREAD) { 1344 tty_hiwat_in_unblock(tp); 1345 ttyinq_flush(&tp->t_inq); 1346 ttydevsw_inwakeup(tp); 1347 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD); 1348 } 1349} 1350 1351static int 1352tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, struct thread *td) 1353{ 1354 int error; 1355 1356 switch (cmd) { 1357 /* 1358 * Modem commands. 1359 * The SER_* and TIOCM_* flags are the same, but one bit 1360 * shifted. I don't know why. 1361 */ 1362 case TIOCSDTR: 1363 ttydevsw_modem(tp, SER_DTR, 0); 1364 return (0); 1365 case TIOCCDTR: 1366 ttydevsw_modem(tp, 0, SER_DTR); 1367 return (0); 1368 case TIOCMSET: { 1369 int bits = *(int *)data; 1370 ttydevsw_modem(tp, 1371 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 1372 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1373 return (0); 1374 } 1375 case TIOCMBIS: { 1376 int bits = *(int *)data; 1377 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0); 1378 return (0); 1379 } 1380 case TIOCMBIC: { 1381 int bits = *(int *)data; 1382 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1383 return (0); 1384 } 1385 case TIOCMGET: 1386 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1); 1387 return (0); 1388 1389 case FIOASYNC: 1390 if (*(int *)data) 1391 tp->t_flags |= TF_ASYNC; 1392 else 1393 tp->t_flags &= ~TF_ASYNC; 1394 return (0); 1395 case FIONBIO: 1396 /* This device supports non-blocking operation. */ 1397 return (0); 1398 case FIONREAD: 1399 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq); 1400 return (0); 1401 case FIONWRITE: 1402 case TIOCOUTQ: 1403 *(int *)data = ttyoutq_bytesused(&tp->t_outq); 1404 return (0); 1405 case FIOSETOWN: 1406 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1407 /* Not allowed to set ownership. */ 1408 return (ENOTTY); 1409 1410 /* Temporarily unlock the TTY to set ownership. */ 1411 tty_unlock(tp); 1412 error = fsetown(*(int *)data, &tp->t_sigio); 1413 tty_lock(tp); 1414 return (error); 1415 case FIOGETOWN: 1416 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1417 /* Not allowed to set ownership. */ 1418 return (ENOTTY); 1419 1420 /* Get ownership. */ 1421 *(int *)data = fgetown(&tp->t_sigio); 1422 return (0); 1423 case TIOCGETA: 1424 /* Obtain terminal flags through tcgetattr(). */ 1425 *(struct termios*)data = tp->t_termios; 1426 return (0); 1427 case TIOCSETA: 1428 case TIOCSETAW: 1429 case TIOCSETAF: { 1430 struct termios *t = data; 1431 1432 /* 1433 * Who makes up these funny rules? According to POSIX, 1434 * input baud rate is set equal to the output baud rate 1435 * when zero. 1436 */ 1437 if (t->c_ispeed == 0) 1438 t->c_ispeed = t->c_ospeed; 1439 1440 /* Discard any unsupported bits. */ 1441 t->c_iflag &= TTYSUP_IFLAG; 1442 t->c_oflag &= TTYSUP_OFLAG; 1443 t->c_lflag &= TTYSUP_LFLAG; 1444 t->c_cflag &= TTYSUP_CFLAG; 1445 1446 /* Set terminal flags through tcsetattr(). */ 1447 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1448 error = tty_drain(tp); 1449 if (error) 1450 return (error); 1451 if (cmd == TIOCSETAF) 1452 tty_flush(tp, FREAD); 1453 } 1454 1455 /* 1456 * Only call param() when the flags really change. 1457 */ 1458 if ((t->c_cflag & CIGNORE) == 0 && 1459 (tp->t_termios.c_cflag != t->c_cflag || 1460 tp->t_termios.c_ispeed != t->c_ispeed || 1461 tp->t_termios.c_ospeed != t->c_ospeed)) { 1462 error = ttydevsw_param(tp, t); 1463 if (error) 1464 return (error); 1465 1466 /* XXX: CLOCAL? */ 1467 1468 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE; 1469 tp->t_termios.c_ispeed = t->c_ispeed; 1470 tp->t_termios.c_ospeed = t->c_ospeed; 1471 1472 /* Baud rate has changed - update watermarks. */ 1473 tty_watermarks(tp); 1474 } 1475 1476 /* Copy new non-device driver parameters. */ 1477 tp->t_termios.c_iflag = t->c_iflag; 1478 tp->t_termios.c_oflag = t->c_oflag; 1479 tp->t_termios.c_lflag = t->c_lflag; 1480 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc); 1481 1482 ttydisc_optimize(tp); 1483 1484 if ((t->c_lflag & ICANON) == 0) { 1485 /* 1486 * When in non-canonical mode, wake up all 1487 * readers. Canonicalize any partial input. VMIN 1488 * and VTIME could also be adjusted. 1489 */ 1490 ttyinq_canonicalize(&tp->t_inq); 1491 tty_wakeup(tp, FREAD); 1492 } 1493 1494 /* 1495 * For packet mode: notify the PTY consumer that VSTOP 1496 * and VSTART may have been changed. 1497 */ 1498 if (tp->t_termios.c_iflag & IXON && 1499 tp->t_termios.c_cc[VSTOP] == CTRL('S') && 1500 tp->t_termios.c_cc[VSTART] == CTRL('Q')) 1501 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP); 1502 else 1503 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP); 1504 return (0); 1505 } 1506 case TIOCGETD: 1507 /* For compatibility - we only support TTYDISC. */ 1508 *(int *)data = TTYDISC; 1509 return (0); 1510 case TIOCGPGRP: 1511 if (!tty_is_ctty(tp, td->td_proc)) 1512 return (ENOTTY); 1513 1514 if (tp->t_pgrp != NULL) 1515 *(int *)data = tp->t_pgrp->pg_id; 1516 else 1517 *(int *)data = NO_PID; 1518 return (0); 1519 case TIOCGSID: 1520 if (!tty_is_ctty(tp, td->td_proc)) 1521 return (ENOTTY); 1522 1523 MPASS(tp->t_session); 1524 *(int *)data = tp->t_session->s_sid; 1525 return (0); 1526 case TIOCSCTTY: { 1527 struct proc *p = td->td_proc; 1528 1529 /* XXX: This looks awful. */ 1530 tty_unlock(tp); 1531 sx_xlock(&proctree_lock); 1532 tty_lock(tp); 1533 1534 if (!SESS_LEADER(p)) { 1535 /* Only the session leader may do this. */ 1536 sx_xunlock(&proctree_lock); 1537 return (EPERM); 1538 } 1539 1540 if (tp->t_session != NULL && tp->t_session == p->p_session) { 1541 /* This is already our controlling TTY. */ 1542 sx_xunlock(&proctree_lock); 1543 return (0); 1544 } 1545 1546 if (p->p_session->s_ttyp != NULL || 1547 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL && 1548 tp->t_session->s_ttyvp->v_type != VBAD)) { 1549 /* 1550 * There is already a relation between a TTY and 1551 * a session, or the caller is not the session 1552 * leader. 1553 * 1554 * Allow the TTY to be stolen when the vnode is 1555 * invalid, but the reference to the TTY is 1556 * still active. This allows immediate reuse of 1557 * TTYs of which the session leader has been 1558 * killed or the TTY revoked. 1559 */ 1560 sx_xunlock(&proctree_lock); 1561 return (EPERM); 1562 } 1563 1564 /* Connect the session to the TTY. */ 1565 tp->t_session = p->p_session; 1566 tp->t_session->s_ttyp = tp; 1567 tp->t_sessioncnt++; 1568 sx_xunlock(&proctree_lock); 1569 1570 /* Assign foreground process group. */ 1571 tp->t_pgrp = p->p_pgrp; 1572 PROC_LOCK(p); 1573 p->p_flag |= P_CONTROLT; 1574 PROC_UNLOCK(p); 1575 1576 return (0); 1577 } 1578 case TIOCSPGRP: { 1579 struct pgrp *pg; 1580 1581 /* 1582 * XXX: Temporarily unlock the TTY to locate the process 1583 * group. This code would be lot nicer if we would ever 1584 * decompose proctree_lock. 1585 */ 1586 tty_unlock(tp); 1587 sx_slock(&proctree_lock); 1588 pg = pgfind(*(int *)data); 1589 if (pg != NULL) 1590 PGRP_UNLOCK(pg); 1591 if (pg == NULL || pg->pg_session != td->td_proc->p_session) { 1592 sx_sunlock(&proctree_lock); 1593 tty_lock(tp); 1594 return (EPERM); 1595 } 1596 tty_lock(tp); 1597 1598 /* 1599 * Determine if this TTY is the controlling TTY after 1600 * relocking the TTY. 1601 */ 1602 if (!tty_is_ctty(tp, td->td_proc)) { 1603 sx_sunlock(&proctree_lock); 1604 return (ENOTTY); 1605 } 1606 tp->t_pgrp = pg; 1607 sx_sunlock(&proctree_lock); 1608 1609 /* Wake up the background process groups. */ 1610 cv_broadcast(&tp->t_bgwait); 1611 return (0); 1612 } 1613 case TIOCFLUSH: { 1614 int flags = *(int *)data; 1615 1616 if (flags == 0) 1617 flags = (FREAD|FWRITE); 1618 else 1619 flags &= (FREAD|FWRITE); 1620 tty_flush(tp, flags); 1621 return (0); 1622 } 1623 case TIOCDRAIN: 1624 /* Drain TTY output. */ 1625 return tty_drain(tp); 1626 case TIOCCONS: 1627 /* Set terminal as console TTY. */ 1628 if (*(int *)data) { 1629 error = priv_check(td, PRIV_TTY_CONSOLE); 1630 if (error) 1631 return (error); 1632 1633 /* 1634 * XXX: constty should really need to be locked! 1635 * XXX: allow disconnected constty's to be stolen! 1636 */ 1637 1638 if (constty == tp) 1639 return (0); 1640 if (constty != NULL) 1641 return (EBUSY); 1642 1643 tty_unlock(tp); 1644 constty_set(tp); 1645 tty_lock(tp); 1646 } else if (constty == tp) { 1647 constty_clear(); 1648 } 1649 return (0); 1650 case TIOCGWINSZ: 1651 /* Obtain window size. */ 1652 *(struct winsize*)data = tp->t_winsize; 1653 return (0); 1654 case TIOCSWINSZ: 1655 /* Set window size. */ 1656 if (bcmp(&tp->t_winsize, data, sizeof(struct winsize)) == 0) 1657 return (0); 1658 tp->t_winsize = *(struct winsize*)data; 1659 tty_signal_pgrp(tp, SIGWINCH); 1660 return (0); 1661 case TIOCEXCL: 1662 tp->t_flags |= TF_EXCLUDE; 1663 return (0); 1664 case TIOCNXCL: 1665 tp->t_flags &= ~TF_EXCLUDE; 1666 return (0); 1667 case TIOCSTOP: 1668 tp->t_flags |= TF_STOPPED; 1669 ttydevsw_pktnotify(tp, TIOCPKT_STOP); 1670 return (0); 1671 case TIOCSTART: 1672 tp->t_flags &= ~TF_STOPPED; 1673 ttydevsw_outwakeup(tp); 1674 ttydevsw_pktnotify(tp, TIOCPKT_START); 1675 return (0); 1676 case TIOCSTAT: 1677 tty_info(tp); 1678 return (0); 1679 } 1680 1681#ifdef COMPAT_43TTY 1682 return tty_ioctl_compat(tp, cmd, data, td); 1683#else /* !COMPAT_43TTY */ 1684 return (ENOIOCTL); 1685#endif /* COMPAT_43TTY */ 1686} 1687 1688int 1689tty_ioctl(struct tty *tp, u_long cmd, void *data, struct thread *td) 1690{ 1691 int error; 1692 1693 tty_lock_assert(tp, MA_OWNED); 1694 1695 if (tty_gone(tp)) 1696 return (ENXIO); 1697 1698 error = ttydevsw_ioctl(tp, cmd, data, td); 1699 if (error == ENOIOCTL) 1700 error = tty_generic_ioctl(tp, cmd, data, td); 1701 1702 return (error); 1703} 1704 1705dev_t 1706tty_udev(struct tty *tp) 1707{ 1708 if (tp->t_dev) 1709 return dev2udev(tp->t_dev); 1710 else 1711 return NODEV; 1712} 1713 1714int 1715tty_checkoutq(struct tty *tp) 1716{ 1717 1718 /* 256 bytes should be enough to print a log message. */ 1719 return (ttyoutq_bytesleft(&tp->t_outq) >= 256); 1720} 1721 1722void 1723tty_hiwat_in_block(struct tty *tp) 1724{ 1725 1726 if ((tp->t_flags & TF_HIWAT_IN) == 0 && 1727 tp->t_termios.c_iflag & IXOFF && 1728 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) { 1729 /* 1730 * Input flow control. Only enter the high watermark when we 1731 * can successfully store the VSTOP character. 1732 */ 1733 if (ttyoutq_write_nofrag(&tp->t_outq, 1734 &tp->t_termios.c_cc[VSTOP], 1) == 0) 1735 tp->t_flags |= TF_HIWAT_IN; 1736 } else { 1737 /* No input flow control. */ 1738 tp->t_flags |= TF_HIWAT_IN; 1739 } 1740} 1741 1742void 1743tty_hiwat_in_unblock(struct tty *tp) 1744{ 1745 1746 if (tp->t_flags & TF_HIWAT_IN && 1747 tp->t_termios.c_iflag & IXOFF && 1748 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) { 1749 /* 1750 * Input flow control. Only leave the high watermark when we 1751 * can successfully store the VSTART character. 1752 */ 1753 if (ttyoutq_write_nofrag(&tp->t_outq, 1754 &tp->t_termios.c_cc[VSTART], 1) == 0) 1755 tp->t_flags &= ~TF_HIWAT_IN; 1756 } else { 1757 /* No input flow control. */ 1758 tp->t_flags &= ~TF_HIWAT_IN; 1759 } 1760 1761 if (!tty_gone(tp)) 1762 ttydevsw_inwakeup(tp); 1763} 1764 1765/* 1766 * TTY hooks interface. 1767 */ 1768 1769static int 1770ttyhook_defrint(struct tty *tp, char c, int flags) 1771{ 1772 1773 if (ttyhook_rint_bypass(tp, &c, 1) != 1) 1774 return (-1); 1775 1776 return (0); 1777} 1778 1779int 1780ttyhook_register(struct tty **rtp, struct proc *p, int fd, 1781 struct ttyhook *th, void *softc) 1782{ 1783 struct tty *tp; 1784 struct file *fp; 1785 struct cdev *dev; 1786 struct cdevsw *cdp; 1787 struct filedesc *fdp; 1788 int error; 1789 1790 /* Validate the file descriptor. */ 1791 if ((fdp = p->p_fd) == NULL) 1792 return (EBADF); 1793 1794 fp = fget_unlocked(fdp, fd); 1795 if (fp == NULL) 1796 return (EBADF); 1797 if (fp->f_ops == &badfileops) { 1798 error = EBADF; 1799 goto done1; 1800 } 1801 1802 /* 1803 * Make sure the vnode is bound to a character device. 1804 * Unlocked check for the vnode type is ok there, because we 1805 * only shall prevent calling devvn_refthread on the file that 1806 * never has been opened over a character device. 1807 */ 1808 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) { 1809 error = EINVAL; 1810 goto done1; 1811 } 1812 1813 /* Make sure it is a TTY. */ 1814 cdp = devvn_refthread(fp->f_vnode, &dev); 1815 if (cdp == NULL) { 1816 error = ENXIO; 1817 goto done1; 1818 } 1819 if (dev != fp->f_data) { 1820 error = ENXIO; 1821 goto done2; 1822 } 1823 if (cdp != &ttydev_cdevsw) { 1824 error = ENOTTY; 1825 goto done2; 1826 } 1827 tp = dev->si_drv1; 1828 1829 /* Try to attach the hook to the TTY. */ 1830 error = EBUSY; 1831 tty_lock(tp); 1832 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0)); 1833 if (tp->t_flags & TF_HOOK) 1834 goto done3; 1835 1836 tp->t_flags |= TF_HOOK; 1837 tp->t_hook = th; 1838 tp->t_hooksoftc = softc; 1839 *rtp = tp; 1840 error = 0; 1841 1842 /* Maybe we can switch into bypass mode now. */ 1843 ttydisc_optimize(tp); 1844 1845 /* Silently convert rint() calls to rint_bypass() when possible. */ 1846 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass)) 1847 th->th_rint = ttyhook_defrint; 1848 1849done3: tty_unlock(tp); 1850done2: dev_relthread(dev); 1851done1: fdrop(fp, curthread); 1852 return (error); 1853} 1854 1855void 1856ttyhook_unregister(struct tty *tp) 1857{ 1858 1859 tty_lock_assert(tp, MA_OWNED); 1860 MPASS(tp->t_flags & TF_HOOK); 1861 1862 /* Disconnect the hook. */ 1863 tp->t_flags &= ~TF_HOOK; 1864 tp->t_hook = NULL; 1865 1866 /* Maybe we need to leave bypass mode. */ 1867 ttydisc_optimize(tp); 1868 1869 /* Maybe deallocate the TTY as well. */ 1870 tty_rel_free(tp); 1871} 1872 1873/* 1874 * /dev/console handling. 1875 */ 1876 1877static int 1878ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 1879{ 1880 struct tty *tp; 1881 1882 /* System has no console device. */ 1883 if (dev_console_filename == NULL) 1884 return (ENXIO); 1885 1886 /* Look up corresponding TTY by device name. */ 1887 sx_slock(&tty_list_sx); 1888 TAILQ_FOREACH(tp, &tty_list, t_list) { 1889 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) { 1890 dev_console->si_drv1 = tp; 1891 break; 1892 } 1893 } 1894 sx_sunlock(&tty_list_sx); 1895 1896 /* System console has no TTY associated. */ 1897 if (dev_console->si_drv1 == NULL) 1898 return (ENXIO); 1899 1900 return (ttydev_open(dev, oflags, devtype, td)); 1901} 1902 1903static int 1904ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag) 1905{ 1906 1907 log_console(uio); 1908 1909 return (ttydev_write(dev, uio, ioflag)); 1910} 1911 1912/* 1913 * /dev/console is a little different than normal TTY's. When opened, 1914 * it determines which TTY to use. When data gets written to it, it 1915 * will be logged in the kernel message buffer. 1916 */ 1917static struct cdevsw ttyconsdev_cdevsw = { 1918 .d_version = D_VERSION, 1919 .d_open = ttyconsdev_open, 1920 .d_close = ttydev_close, 1921 .d_read = ttydev_read, 1922 .d_write = ttyconsdev_write, 1923 .d_ioctl = ttydev_ioctl, 1924 .d_kqfilter = ttydev_kqfilter, 1925 .d_poll = ttydev_poll, 1926 .d_mmap = ttydev_mmap, 1927 .d_name = "ttyconsdev", 1928 .d_flags = D_TTY, 1929}; 1930 1931static void 1932ttyconsdev_init(void *unused) 1933{ 1934 1935 dev_console = make_dev(&ttyconsdev_cdevsw, 0, UID_ROOT, GID_WHEEL, 1936 0600, "console"); 1937} 1938 1939SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL); 1940 1941void 1942ttyconsdev_select(const char *name) 1943{ 1944 1945 dev_console_filename = name; 1946} 1947 1948/* 1949 * Debugging routines. 1950 */ 1951 1952#include "opt_ddb.h" 1953#ifdef DDB 1954#include <ddb/ddb.h> 1955#include <ddb/db_sym.h> 1956 1957static struct { 1958 int flag; 1959 char val; 1960} ttystates[] = { 1961#if 0 1962 { TF_NOPREFIX, 'N' }, 1963#endif 1964 { TF_INITLOCK, 'I' }, 1965 { TF_CALLOUT, 'C' }, 1966 1967 /* Keep these together -> 'Oi' and 'Oo'. */ 1968 { TF_OPENED, 'O' }, 1969 { TF_OPENED_IN, 'i' }, 1970 { TF_OPENED_OUT, 'o' }, 1971 { TF_OPENED_CONS, 'c' }, 1972 1973 { TF_GONE, 'G' }, 1974 { TF_OPENCLOSE, 'B' }, 1975 { TF_ASYNC, 'Y' }, 1976 { TF_LITERAL, 'L' }, 1977 1978 /* Keep these together -> 'Hi' and 'Ho'. */ 1979 { TF_HIWAT, 'H' }, 1980 { TF_HIWAT_IN, 'i' }, 1981 { TF_HIWAT_OUT, 'o' }, 1982 1983 { TF_STOPPED, 'S' }, 1984 { TF_EXCLUDE, 'X' }, 1985 { TF_BYPASS, 'l' }, 1986 { TF_ZOMBIE, 'Z' }, 1987 { TF_HOOK, 's' }, 1988 1989 /* Keep these together -> 'bi' and 'bo'. */ 1990 { TF_BUSY, 'b' }, 1991 { TF_BUSY_IN, 'i' }, 1992 { TF_BUSY_OUT, 'o' }, 1993 1994 { 0, '\0'}, 1995}; 1996 1997#define TTY_FLAG_BITS \ 1998 "\20\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \ 1999 "\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \ 2000 "\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK" 2001 2002#define DB_PRINTSYM(name, addr) \ 2003 db_printf("%s " #name ": ", sep); \ 2004 db_printsym((db_addr_t) addr, DB_STGY_ANY); \ 2005 db_printf("\n"); 2006 2007static void 2008_db_show_devsw(const char *sep, const struct ttydevsw *tsw) 2009{ 2010 db_printf("%sdevsw: ", sep); 2011 db_printsym((db_addr_t)tsw, DB_STGY_ANY); 2012 db_printf(" (%p)\n", tsw); 2013 DB_PRINTSYM(open, tsw->tsw_open); 2014 DB_PRINTSYM(close, tsw->tsw_close); 2015 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup); 2016 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup); 2017 DB_PRINTSYM(ioctl, tsw->tsw_ioctl); 2018 DB_PRINTSYM(param, tsw->tsw_param); 2019 DB_PRINTSYM(modem, tsw->tsw_modem); 2020 DB_PRINTSYM(mmap, tsw->tsw_mmap); 2021 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify); 2022 DB_PRINTSYM(free, tsw->tsw_free); 2023} 2024static void 2025_db_show_hooks(const char *sep, const struct ttyhook *th) 2026{ 2027 db_printf("%shook: ", sep); 2028 db_printsym((db_addr_t)th, DB_STGY_ANY); 2029 db_printf(" (%p)\n", th); 2030 if (th == NULL) 2031 return; 2032 DB_PRINTSYM(rint, th->th_rint); 2033 DB_PRINTSYM(rint_bypass, th->th_rint_bypass); 2034 DB_PRINTSYM(rint_done, th->th_rint_done); 2035 DB_PRINTSYM(rint_poll, th->th_rint_poll); 2036 DB_PRINTSYM(getc_inject, th->th_getc_inject); 2037 DB_PRINTSYM(getc_capture, th->th_getc_capture); 2038 DB_PRINTSYM(getc_poll, th->th_getc_poll); 2039 DB_PRINTSYM(close, th->th_close); 2040} 2041 2042static void 2043_db_show_termios(const char *name, const struct termios *t) 2044{ 2045 2046 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x " 2047 "lflag 0x%x ispeed %u ospeed %u\n", name, 2048 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag, 2049 t->c_ispeed, t->c_ospeed); 2050} 2051 2052/* DDB command to show TTY statistics. */ 2053DB_SHOW_COMMAND(tty, db_show_tty) 2054{ 2055 struct tty *tp; 2056 2057 if (!have_addr) { 2058 db_printf("usage: show tty <addr>\n"); 2059 return; 2060 } 2061 tp = (struct tty *)addr; 2062 2063 db_printf("0x%p: %s\n", tp, tty_devname(tp)); 2064 db_printf("\tmtx: %p\n", tp->t_mtx); 2065 db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS); 2066 db_printf("\trevokecnt: %u\n", tp->t_revokecnt); 2067 2068 /* Buffering mechanisms. */ 2069 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u " 2070 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin, 2071 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end, 2072 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota); 2073 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n", 2074 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end, 2075 tp->t_outq.to_nblocks, tp->t_outq.to_quota); 2076 db_printf("\tinlow: %zu\n", tp->t_inlow); 2077 db_printf("\toutlow: %zu\n", tp->t_outlow); 2078 _db_show_termios("\ttermios", &tp->t_termios); 2079 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n", 2080 tp->t_winsize.ws_row, tp->t_winsize.ws_col, 2081 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel); 2082 db_printf("\tcolumn: %u\n", tp->t_column); 2083 db_printf("\twritepos: %u\n", tp->t_writepos); 2084 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags); 2085 2086 /* Init/lock-state devices. */ 2087 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in); 2088 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out); 2089 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in); 2090 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out); 2091 2092 /* Hooks */ 2093 _db_show_devsw("\t", tp->t_devsw); 2094 _db_show_hooks("\t", tp->t_hook); 2095 2096 /* Process info. */ 2097 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp, 2098 tp->t_pgrp ? tp->t_pgrp->pg_id : 0, 2099 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0); 2100 db_printf("\tsession: %p", tp->t_session); 2101 if (tp->t_session != NULL) 2102 db_printf(" count %u leader %p tty %p sid %d login %s", 2103 tp->t_session->s_count, tp->t_session->s_leader, 2104 tp->t_session->s_ttyp, tp->t_session->s_sid, 2105 tp->t_session->s_login); 2106 db_printf("\n"); 2107 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt); 2108 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc); 2109 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc); 2110 db_printf("\tdev: %p\n", tp->t_dev); 2111} 2112 2113/* DDB command to list TTYs. */ 2114DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys) 2115{ 2116 struct tty *tp; 2117 size_t isiz, osiz; 2118 int i, j; 2119 2120 /* Make the output look like `pstat -t'. */ 2121 db_printf("PTR "); 2122#if defined(__LP64__) 2123 db_printf(" "); 2124#endif 2125 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW " 2126 "COL SESS PGID STATE\n"); 2127 2128 TAILQ_FOREACH(tp, &tty_list, t_list) { 2129 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE; 2130 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE; 2131 2132 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ", 2133 tp, 2134 tty_devname(tp), 2135 isiz, 2136 tp->t_inq.ti_linestart - tp->t_inq.ti_begin, 2137 tp->t_inq.ti_end - tp->t_inq.ti_linestart, 2138 isiz - tp->t_inlow, 2139 osiz, 2140 tp->t_outq.to_end - tp->t_outq.to_begin, 2141 osiz - tp->t_outlow, 2142 MIN(tp->t_column, 99999), 2143 tp->t_session ? tp->t_session->s_sid : 0, 2144 tp->t_pgrp ? tp->t_pgrp->pg_id : 0); 2145 2146 /* Flag bits. */ 2147 for (i = j = 0; ttystates[i].flag; i++) 2148 if (tp->t_flags & ttystates[i].flag) { 2149 db_printf("%c", ttystates[i].val); 2150 j++; 2151 } 2152 if (j == 0) 2153 db_printf("-"); 2154 db_printf("\n"); 2155 } 2156} 2157#endif /* DDB */ 2158