tty.c revision 198213
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 198213 2009-10-18 19:45:44Z 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; 106 107 /* Provide an input buffer for 0.2 seconds of data. */ 108 bs = MIN(tp->t_termios.c_ispeed / 5, TTYBUF_MAX); 109 ttyinq_setsize(&tp->t_inq, tp, bs); 110 111 /* Set low watermark at 10% (when 90% is available). */ 112 tp->t_inlow = (ttyinq_getsize(&tp->t_inq) * 9) / 10; 113 114 /* Provide an ouput buffer for 0.2 seconds of data. */ 115 bs = MIN(tp->t_termios.c_ospeed / 5, TTYBUF_MAX); 116 ttyoutq_setsize(&tp->t_outq, tp, bs); 117 118 /* Set low watermark at 10% (when 90% is available). */ 119 tp->t_outlow = (ttyoutq_getsize(&tp->t_outq) * 9) / 10; 120} 121 122static int 123tty_drain(struct tty *tp) 124{ 125 int error; 126 127 if (ttyhook_hashook(tp, getc_inject)) 128 /* buffer is inaccessible */ 129 return (0); 130 131 while (ttyoutq_bytesused(&tp->t_outq) > 0) { 132 ttydevsw_outwakeup(tp); 133 /* Could be handled synchronously. */ 134 if (ttyoutq_bytesused(&tp->t_outq) == 0) 135 return (0); 136 137 /* Wait for data to be drained. */ 138 error = tty_wait(tp, &tp->t_outwait); 139 if (error) 140 return (error); 141 } 142 143 return (0); 144} 145 146/* 147 * Though ttydev_enter() and ttydev_leave() seem to be related, they 148 * don't have to be used together. ttydev_enter() is used by the cdev 149 * operations to prevent an actual operation from being processed when 150 * the TTY has been abandoned. ttydev_leave() is used by ttydev_open() 151 * and ttydev_close() to determine whether per-TTY data should be 152 * deallocated. 153 */ 154 155static __inline int 156ttydev_enter(struct tty *tp) 157{ 158 tty_lock(tp); 159 160 if (tty_gone(tp) || !tty_opened(tp)) { 161 /* Device is already gone. */ 162 tty_unlock(tp); 163 return (ENXIO); 164 } 165 166 return (0); 167} 168 169static void 170ttydev_leave(struct tty *tp) 171{ 172 tty_lock_assert(tp, MA_OWNED); 173 174 if (tty_opened(tp) || tp->t_flags & TF_OPENCLOSE) { 175 /* Device is still opened somewhere. */ 176 tty_unlock(tp); 177 return; 178 } 179 180 tp->t_flags |= TF_OPENCLOSE; 181 182 /* Stop asynchronous I/O. */ 183 funsetown(&tp->t_sigio); 184 185 /* Remove console TTY. */ 186 if (constty == tp) 187 constty_clear(); 188 189 /* Drain any output. */ 190 MPASS((tp->t_flags & TF_STOPPED) == 0); 191 if (!tty_gone(tp)) 192 tty_drain(tp); 193 194 ttydisc_close(tp); 195 196 /* Destroy associated buffers already. */ 197 ttyinq_free(&tp->t_inq); 198 tp->t_inlow = 0; 199 ttyoutq_free(&tp->t_outq); 200 tp->t_outlow = 0; 201 202 knlist_clear(&tp->t_inpoll.si_note, 1); 203 knlist_clear(&tp->t_outpoll.si_note, 1); 204 205 if (!tty_gone(tp)) 206 ttydevsw_close(tp); 207 208 tp->t_flags &= ~TF_OPENCLOSE; 209 cv_broadcast(&tp->t_dcdwait); 210 tty_rel_free(tp); 211} 212 213/* 214 * Operations that are exposed through the character device in /dev. 215 */ 216static int 217ttydev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 218{ 219 struct tty *tp = dev->si_drv1; 220 int error = 0; 221 222 tty_lock(tp); 223 if (tty_gone(tp)) { 224 /* Device is already gone. */ 225 tty_unlock(tp); 226 return (ENXIO); 227 } 228 229 /* 230 * Block when other processes are currently opening or closing 231 * the TTY. 232 */ 233 while (tp->t_flags & TF_OPENCLOSE) { 234 error = tty_wait(tp, &tp->t_dcdwait); 235 if (error != 0) { 236 tty_unlock(tp); 237 return (error); 238 } 239 } 240 tp->t_flags |= TF_OPENCLOSE; 241 242 /* 243 * Make sure the "tty" and "cua" device cannot be opened at the 244 * same time. 245 */ 246 if (TTY_CALLOUT(tp, dev)) { 247 if (tp->t_flags & TF_OPENED_IN) { 248 error = EBUSY; 249 goto done; 250 } 251 } else { 252 if (tp->t_flags & TF_OPENED_OUT) { 253 error = EBUSY; 254 goto done; 255 } 256 } 257 258 if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) { 259 error = EBUSY; 260 goto done; 261 } 262 263 if (!tty_opened(tp)) { 264 /* Set proper termios flags. */ 265 if (TTY_CALLOUT(tp, dev)) { 266 tp->t_termios = tp->t_termios_init_out; 267 } else { 268 tp->t_termios = tp->t_termios_init_in; 269 } 270 ttydevsw_param(tp, &tp->t_termios); 271 272 ttydevsw_modem(tp, SER_DTR|SER_RTS, 0); 273 274 error = ttydevsw_open(tp); 275 if (error != 0) 276 goto done; 277 278 ttydisc_open(tp); 279 tty_watermarks(tp); 280 } 281 282 /* Wait for Carrier Detect. */ 283 if (!TTY_CALLOUT(tp, dev) && (oflags & O_NONBLOCK) == 0 && 284 (tp->t_termios.c_cflag & CLOCAL) == 0) { 285 while ((ttydevsw_modem(tp, 0, 0) & SER_DCD) == 0) { 286 error = tty_wait(tp, &tp->t_dcdwait); 287 if (error != 0) 288 goto done; 289 } 290 } 291 292 if (dev == dev_console) 293 tp->t_flags |= TF_OPENED_CONS; 294 else if (TTY_CALLOUT(tp, dev)) 295 tp->t_flags |= TF_OPENED_OUT; 296 else 297 tp->t_flags |= TF_OPENED_IN; 298 299done: tp->t_flags &= ~TF_OPENCLOSE; 300 cv_broadcast(&tp->t_dcdwait); 301 ttydev_leave(tp); 302 303 return (error); 304} 305 306static int 307ttydev_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 308{ 309 struct tty *tp = dev->si_drv1; 310 311 tty_lock(tp); 312 313 /* 314 * Don't actually close the device if it is being used as the 315 * console. 316 */ 317 MPASS((tp->t_flags & TF_OPENED) != TF_OPENED); 318 if (dev == dev_console) 319 tp->t_flags &= ~TF_OPENED_CONS; 320 else 321 tp->t_flags &= ~(TF_OPENED_IN|TF_OPENED_OUT); 322 323 if (tp->t_flags & TF_OPENED) { 324 tty_unlock(tp); 325 return (0); 326 } 327 328 /* 329 * This can only be called once. The callin and the callout 330 * devices cannot be opened at the same time. 331 */ 332 tp->t_flags &= ~(TF_EXCLUDE|TF_STOPPED); 333 334 /* Properly wake up threads that are stuck - revoke(). */ 335 tp->t_revokecnt++; 336 tty_wakeup(tp, FREAD|FWRITE); 337 cv_broadcast(&tp->t_bgwait); 338 cv_broadcast(&tp->t_dcdwait); 339 340 ttydev_leave(tp); 341 342 return (0); 343} 344 345static __inline int 346tty_is_ctty(struct tty *tp, struct proc *p) 347{ 348 tty_lock_assert(tp, MA_OWNED); 349 350 return (p->p_session == tp->t_session && p->p_flag & P_CONTROLT); 351} 352 353static int 354tty_wait_background(struct tty *tp, struct thread *td, int sig) 355{ 356 struct proc *p = td->td_proc; 357 struct pgrp *pg; 358 int error; 359 360 MPASS(sig == SIGTTIN || sig == SIGTTOU); 361 tty_lock_assert(tp, MA_OWNED); 362 363 for (;;) { 364 PROC_LOCK(p); 365 /* 366 * The process should only sleep, when: 367 * - This terminal is the controling terminal 368 * - Its process group is not the foreground process 369 * group 370 * - The parent process isn't waiting for the child to 371 * exit 372 * - the signal to send to the process isn't masked 373 */ 374 if (!tty_is_ctty(tp, p) || p->p_pgrp == tp->t_pgrp) { 375 /* Allow the action to happen. */ 376 PROC_UNLOCK(p); 377 return (0); 378 } 379 380 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, sig) || 381 SIGISMEMBER(td->td_sigmask, sig)) { 382 /* Only allow them in write()/ioctl(). */ 383 PROC_UNLOCK(p); 384 return (sig == SIGTTOU ? 0 : EIO); 385 } 386 387 pg = p->p_pgrp; 388 if (p->p_flag & P_PPWAIT || pg->pg_jobc == 0) { 389 /* Don't allow the action to happen. */ 390 PROC_UNLOCK(p); 391 return (EIO); 392 } 393 PROC_UNLOCK(p); 394 395 /* 396 * Send the signal and sleep until we're the new 397 * foreground process group. 398 */ 399 PGRP_LOCK(pg); 400 pgsignal(pg, sig, 1); 401 PGRP_UNLOCK(pg); 402 403 error = tty_wait(tp, &tp->t_bgwait); 404 if (error) 405 return (error); 406 } 407} 408 409static int 410ttydev_read(struct cdev *dev, struct uio *uio, int ioflag) 411{ 412 struct tty *tp = dev->si_drv1; 413 int error; 414 415 error = ttydev_enter(tp); 416 if (error) 417 goto done; 418 419 error = tty_wait_background(tp, curthread, SIGTTIN); 420 if (error) { 421 tty_unlock(tp); 422 goto done; 423 } 424 425 error = ttydisc_read(tp, uio, ioflag); 426 tty_unlock(tp); 427 428 /* 429 * The read() call should not throw an error when the device is 430 * being destroyed. Silently convert it to an EOF. 431 */ 432done: if (error == ENXIO) 433 error = 0; 434 return (error); 435} 436 437static int 438ttydev_write(struct cdev *dev, struct uio *uio, int ioflag) 439{ 440 struct tty *tp = dev->si_drv1; 441 int error; 442 443 error = ttydev_enter(tp); 444 if (error) 445 return (error); 446 447 if (tp->t_termios.c_lflag & TOSTOP) { 448 error = tty_wait_background(tp, curthread, SIGTTOU); 449 if (error) 450 goto done; 451 } 452 453 if (ioflag & IO_NDELAY && tp->t_flags & TF_BUSY_OUT) { 454 /* Allow non-blocking writes to bypass serialization. */ 455 error = ttydisc_write(tp, uio, ioflag); 456 } else { 457 /* Serialize write() calls. */ 458 while (tp->t_flags & TF_BUSY_OUT) { 459 error = tty_wait(tp, &tp->t_outserwait); 460 if (error) 461 goto done; 462 } 463 464 tp->t_flags |= TF_BUSY_OUT; 465 error = ttydisc_write(tp, uio, ioflag); 466 tp->t_flags &= ~TF_BUSY_OUT; 467 cv_signal(&tp->t_outserwait); 468 } 469 470done: tty_unlock(tp); 471 return (error); 472} 473 474static int 475ttydev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 476 struct thread *td) 477{ 478 struct tty *tp = dev->si_drv1; 479 int error; 480 481 error = ttydev_enter(tp); 482 if (error) 483 return (error); 484 485 switch (cmd) { 486 case TIOCCBRK: 487 case TIOCCONS: 488 case TIOCDRAIN: 489 case TIOCEXCL: 490 case TIOCFLUSH: 491 case TIOCNXCL: 492 case TIOCSBRK: 493 case TIOCSCTTY: 494 case TIOCSETA: 495 case TIOCSETAF: 496 case TIOCSETAW: 497 case TIOCSPGRP: 498 case TIOCSTART: 499 case TIOCSTAT: 500 case TIOCSTOP: 501 case TIOCSWINSZ: 502#if 0 503 case TIOCSDRAINWAIT: 504 case TIOCSETD: 505 case TIOCSTI: 506#endif 507#ifdef COMPAT_43TTY 508 case TIOCLBIC: 509 case TIOCLBIS: 510 case TIOCLSET: 511 case TIOCSETC: 512 case OTIOCSETD: 513 case TIOCSETN: 514 case TIOCSETP: 515 case TIOCSLTC: 516#endif /* COMPAT_43TTY */ 517 /* 518 * If the ioctl() causes the TTY to be modified, let it 519 * wait in the background. 520 */ 521 error = tty_wait_background(tp, curthread, SIGTTOU); 522 if (error) 523 goto done; 524 } 525 526 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 527 struct termios *old = &tp->t_termios; 528 struct termios *new = (struct termios *)data; 529 struct termios *lock = TTY_CALLOUT(tp, dev) ? 530 &tp->t_termios_lock_out : &tp->t_termios_lock_in; 531 int cc; 532 533 /* 534 * Lock state devices. Just overwrite the values of the 535 * commands that are currently in use. 536 */ 537 new->c_iflag = (old->c_iflag & lock->c_iflag) | 538 (new->c_iflag & ~lock->c_iflag); 539 new->c_oflag = (old->c_oflag & lock->c_oflag) | 540 (new->c_oflag & ~lock->c_oflag); 541 new->c_cflag = (old->c_cflag & lock->c_cflag) | 542 (new->c_cflag & ~lock->c_cflag); 543 new->c_lflag = (old->c_lflag & lock->c_lflag) | 544 (new->c_lflag & ~lock->c_lflag); 545 for (cc = 0; cc < NCCS; ++cc) 546 if (lock->c_cc[cc]) 547 new->c_cc[cc] = old->c_cc[cc]; 548 if (lock->c_ispeed) 549 new->c_ispeed = old->c_ispeed; 550 if (lock->c_ospeed) 551 new->c_ospeed = old->c_ospeed; 552 } 553 554 error = tty_ioctl(tp, cmd, data, td); 555done: tty_unlock(tp); 556 557 return (error); 558} 559 560static int 561ttydev_poll(struct cdev *dev, int events, struct thread *td) 562{ 563 struct tty *tp = dev->si_drv1; 564 int error, revents = 0; 565 566 error = ttydev_enter(tp); 567 if (error) 568 return ((events & (POLLIN|POLLRDNORM)) | POLLHUP); 569 570 if (events & (POLLIN|POLLRDNORM)) { 571 /* See if we can read something. */ 572 if (ttydisc_read_poll(tp) > 0) 573 revents |= events & (POLLIN|POLLRDNORM); 574 } 575 576 if (tp->t_flags & TF_ZOMBIE) { 577 /* Hangup flag on zombie state. */ 578 revents |= POLLHUP; 579 } else if (events & (POLLOUT|POLLWRNORM)) { 580 /* See if we can write something. */ 581 if (ttydisc_write_poll(tp) > 0) 582 revents |= events & (POLLOUT|POLLWRNORM); 583 } 584 585 if (revents == 0) { 586 if (events & (POLLIN|POLLRDNORM)) 587 selrecord(td, &tp->t_inpoll); 588 if (events & (POLLOUT|POLLWRNORM)) 589 selrecord(td, &tp->t_outpoll); 590 } 591 592 tty_unlock(tp); 593 594 return (revents); 595} 596 597static int 598ttydev_mmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot) 599{ 600 struct tty *tp = dev->si_drv1; 601 int error; 602 603 /* Handle mmap() through the driver. */ 604 605 error = ttydev_enter(tp); 606 if (error) 607 return (-1); 608 error = ttydevsw_mmap(tp, offset, paddr, nprot); 609 tty_unlock(tp); 610 611 return (error); 612} 613 614/* 615 * kqueue support. 616 */ 617 618static void 619tty_kqops_read_detach(struct knote *kn) 620{ 621 struct tty *tp = kn->kn_hook; 622 623 knlist_remove(&tp->t_inpoll.si_note, kn, 0); 624} 625 626static int 627tty_kqops_read_event(struct knote *kn, long hint) 628{ 629 struct tty *tp = kn->kn_hook; 630 631 tty_lock_assert(tp, MA_OWNED); 632 633 if (tty_gone(tp) || tp->t_flags & TF_ZOMBIE) { 634 kn->kn_flags |= EV_EOF; 635 return (1); 636 } else { 637 kn->kn_data = ttydisc_read_poll(tp); 638 return (kn->kn_data > 0); 639 } 640} 641 642static void 643tty_kqops_write_detach(struct knote *kn) 644{ 645 struct tty *tp = kn->kn_hook; 646 647 knlist_remove(&tp->t_outpoll.si_note, kn, 0); 648} 649 650static int 651tty_kqops_write_event(struct knote *kn, long hint) 652{ 653 struct tty *tp = kn->kn_hook; 654 655 tty_lock_assert(tp, MA_OWNED); 656 657 if (tty_gone(tp)) { 658 kn->kn_flags |= EV_EOF; 659 return (1); 660 } else { 661 kn->kn_data = ttydisc_write_poll(tp); 662 return (kn->kn_data > 0); 663 } 664} 665 666static struct filterops tty_kqops_read = { 667 .f_isfd = 1, 668 .f_detach = tty_kqops_read_detach, 669 .f_event = tty_kqops_read_event, 670}; 671static struct filterops tty_kqops_write = { 672 .f_isfd = 1, 673 .f_detach = tty_kqops_write_detach, 674 .f_event = tty_kqops_write_event, 675}; 676 677static int 678ttydev_kqfilter(struct cdev *dev, struct knote *kn) 679{ 680 struct tty *tp = dev->si_drv1; 681 int error; 682 683 error = ttydev_enter(tp); 684 if (error) 685 return (error); 686 687 switch (kn->kn_filter) { 688 case EVFILT_READ: 689 kn->kn_hook = tp; 690 kn->kn_fop = &tty_kqops_read; 691 knlist_add(&tp->t_inpoll.si_note, kn, 1); 692 break; 693 case EVFILT_WRITE: 694 kn->kn_hook = tp; 695 kn->kn_fop = &tty_kqops_write; 696 knlist_add(&tp->t_outpoll.si_note, kn, 1); 697 break; 698 default: 699 error = EINVAL; 700 break; 701 } 702 703 tty_unlock(tp); 704 return (error); 705} 706 707static struct cdevsw ttydev_cdevsw = { 708 .d_version = D_VERSION, 709 .d_open = ttydev_open, 710 .d_close = ttydev_close, 711 .d_read = ttydev_read, 712 .d_write = ttydev_write, 713 .d_ioctl = ttydev_ioctl, 714 .d_kqfilter = ttydev_kqfilter, 715 .d_poll = ttydev_poll, 716 .d_mmap = ttydev_mmap, 717 .d_name = "ttydev", 718 .d_flags = D_TTY, 719}; 720 721/* 722 * Init/lock-state devices 723 */ 724 725static int 726ttyil_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 727{ 728 struct tty *tp = dev->si_drv1; 729 int error = 0; 730 731 tty_lock(tp); 732 if (tty_gone(tp)) 733 error = ENODEV; 734 tty_unlock(tp); 735 736 return (error); 737} 738 739static int 740ttyil_close(struct cdev *dev, int flag, int mode, struct thread *td) 741{ 742 return (0); 743} 744 745static int 746ttyil_rdwr(struct cdev *dev, struct uio *uio, int ioflag) 747{ 748 return (ENODEV); 749} 750 751static int 752ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 753 struct thread *td) 754{ 755 struct tty *tp = dev->si_drv1; 756 int error = 0; 757 758 tty_lock(tp); 759 if (tty_gone(tp)) { 760 error = ENODEV; 761 goto done; 762 } 763 764 switch (cmd) { 765 case TIOCGETA: 766 /* Obtain terminal flags through tcgetattr(). */ 767 *(struct termios*)data = *(struct termios*)dev->si_drv2; 768 break; 769 case TIOCSETA: 770 /* Set terminal flags through tcsetattr(). */ 771 error = priv_check(td, PRIV_TTY_SETA); 772 if (error) 773 break; 774 *(struct termios*)dev->si_drv2 = *(struct termios*)data; 775 break; 776 case TIOCGETD: 777 *(int *)data = TTYDISC; 778 break; 779 case TIOCGWINSZ: 780 bzero(data, sizeof(struct winsize)); 781 break; 782 default: 783 error = ENOTTY; 784 } 785 786done: tty_unlock(tp); 787 return (error); 788} 789 790static struct cdevsw ttyil_cdevsw = { 791 .d_version = D_VERSION, 792 .d_open = ttyil_open, 793 .d_close = ttyil_close, 794 .d_read = ttyil_rdwr, 795 .d_write = ttyil_rdwr, 796 .d_ioctl = ttyil_ioctl, 797 .d_name = "ttyil", 798 .d_flags = D_TTY, 799}; 800 801static void 802tty_init_termios(struct tty *tp) 803{ 804 struct termios *t = &tp->t_termios_init_in; 805 806 t->c_cflag = TTYDEF_CFLAG; 807 t->c_iflag = TTYDEF_IFLAG; 808 t->c_lflag = TTYDEF_LFLAG; 809 t->c_oflag = TTYDEF_OFLAG; 810 t->c_ispeed = TTYDEF_SPEED; 811 t->c_ospeed = TTYDEF_SPEED; 812 memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars); 813 814 tp->t_termios_init_out = *t; 815} 816 817void 818tty_init_console(struct tty *tp, speed_t s) 819{ 820 struct termios *ti = &tp->t_termios_init_in; 821 struct termios *to = &tp->t_termios_init_out; 822 823 if (s != 0) { 824 ti->c_ispeed = ti->c_ospeed = s; 825 to->c_ispeed = to->c_ospeed = s; 826 } 827 828 ti->c_cflag |= CLOCAL; 829 to->c_cflag |= CLOCAL; 830} 831 832/* 833 * Standard device routine implementations, mostly meant for 834 * pseudo-terminal device drivers. When a driver creates a new terminal 835 * device class, missing routines are patched. 836 */ 837 838static int 839ttydevsw_defopen(struct tty *tp) 840{ 841 842 return (0); 843} 844 845static void 846ttydevsw_defclose(struct tty *tp) 847{ 848} 849 850static void 851ttydevsw_defoutwakeup(struct tty *tp) 852{ 853 854 panic("Terminal device has output, while not implemented"); 855} 856 857static void 858ttydevsw_definwakeup(struct tty *tp) 859{ 860} 861 862static int 863ttydevsw_defioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td) 864{ 865 866 return (ENOIOCTL); 867} 868 869static int 870ttydevsw_defparam(struct tty *tp, struct termios *t) 871{ 872 873 /* Use a fake baud rate, we're not a real device. */ 874 t->c_ispeed = t->c_ospeed = TTYDEF_SPEED; 875 876 return (0); 877} 878 879static int 880ttydevsw_defmodem(struct tty *tp, int sigon, int sigoff) 881{ 882 883 /* Simulate a carrier to make the TTY layer happy. */ 884 return (SER_DCD); 885} 886 887static int 888ttydevsw_defmmap(struct tty *tp, vm_offset_t offset, vm_paddr_t *paddr, 889 int nprot) 890{ 891 892 return (-1); 893} 894 895static void 896ttydevsw_defpktnotify(struct tty *tp, char event) 897{ 898} 899 900static void 901ttydevsw_deffree(void *softc) 902{ 903 904 panic("Terminal device freed without a free-handler"); 905} 906 907/* 908 * TTY allocation and deallocation. TTY devices can be deallocated when 909 * the driver doesn't use it anymore, when the TTY isn't a session's 910 * controlling TTY and when the device node isn't opened through devfs. 911 */ 912 913struct tty * 914tty_alloc(struct ttydevsw *tsw, void *sc) 915{ 916 917 return (tty_alloc_mutex(tsw, sc, NULL)); 918} 919 920struct tty * 921tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex) 922{ 923 struct tty *tp; 924 925 /* Make sure the driver defines all routines. */ 926#define PATCH_FUNC(x) do { \ 927 if (tsw->tsw_ ## x == NULL) \ 928 tsw->tsw_ ## x = ttydevsw_def ## x; \ 929} while (0) 930 PATCH_FUNC(open); 931 PATCH_FUNC(close); 932 PATCH_FUNC(outwakeup); 933 PATCH_FUNC(inwakeup); 934 PATCH_FUNC(ioctl); 935 PATCH_FUNC(param); 936 PATCH_FUNC(modem); 937 PATCH_FUNC(mmap); 938 PATCH_FUNC(pktnotify); 939 PATCH_FUNC(free); 940#undef PATCH_FUNC 941 942 tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO); 943 tp->t_devsw = tsw; 944 tp->t_devswsoftc = sc; 945 tp->t_flags = tsw->tsw_flags; 946 947 tty_init_termios(tp); 948 949 cv_init(&tp->t_inwait, "ttyin"); 950 cv_init(&tp->t_outwait, "ttyout"); 951 cv_init(&tp->t_outserwait, "ttyosr"); 952 cv_init(&tp->t_bgwait, "ttybg"); 953 cv_init(&tp->t_dcdwait, "ttydcd"); 954 955 /* Allow drivers to use a custom mutex to lock the TTY. */ 956 if (mutex != NULL) { 957 tp->t_mtx = mutex; 958 } else { 959 tp->t_mtx = &tp->t_mtxobj; 960 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF); 961 } 962 963 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx); 964 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx); 965 966 sx_xlock(&tty_list_sx); 967 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 968 tty_list_count++; 969 sx_xunlock(&tty_list_sx); 970 971 return (tp); 972} 973 974static void 975tty_dealloc(void *arg) 976{ 977 struct tty *tp = arg; 978 979 sx_xlock(&tty_list_sx); 980 TAILQ_REMOVE(&tty_list, tp, t_list); 981 tty_list_count--; 982 sx_xunlock(&tty_list_sx); 983 984 /* Make sure we haven't leaked buffers. */ 985 MPASS(ttyinq_getsize(&tp->t_inq) == 0); 986 MPASS(ttyoutq_getsize(&tp->t_outq) == 0); 987 988 knlist_destroy(&tp->t_inpoll.si_note); 989 knlist_destroy(&tp->t_outpoll.si_note); 990 991 cv_destroy(&tp->t_inwait); 992 cv_destroy(&tp->t_outwait); 993 cv_destroy(&tp->t_bgwait); 994 cv_destroy(&tp->t_dcdwait); 995 cv_destroy(&tp->t_outserwait); 996 997 if (tp->t_mtx == &tp->t_mtxobj) 998 mtx_destroy(&tp->t_mtxobj); 999 ttydevsw_free(tp); 1000 free(tp, M_TTY); 1001} 1002 1003static void 1004tty_rel_free(struct tty *tp) 1005{ 1006 struct cdev *dev; 1007 1008 tty_lock_assert(tp, MA_OWNED); 1009 1010#define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE) 1011 if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) { 1012 /* TTY is still in use. */ 1013 tty_unlock(tp); 1014 return; 1015 } 1016 1017 /* TTY can be deallocated. */ 1018 dev = tp->t_dev; 1019 tp->t_dev = NULL; 1020 tty_unlock(tp); 1021 1022 destroy_dev_sched_cb(dev, tty_dealloc, tp); 1023} 1024 1025void 1026tty_rel_pgrp(struct tty *tp, struct pgrp *pg) 1027{ 1028 MPASS(tp->t_sessioncnt > 0); 1029 tty_lock_assert(tp, MA_OWNED); 1030 1031 if (tp->t_pgrp == pg) 1032 tp->t_pgrp = NULL; 1033 1034 tty_unlock(tp); 1035} 1036 1037void 1038tty_rel_sess(struct tty *tp, struct session *sess) 1039{ 1040 MPASS(tp->t_sessioncnt > 0); 1041 1042 /* Current session has left. */ 1043 if (tp->t_session == sess) { 1044 tp->t_session = NULL; 1045 MPASS(tp->t_pgrp == NULL); 1046 } 1047 tp->t_sessioncnt--; 1048 tty_rel_free(tp); 1049} 1050 1051void 1052tty_rel_gone(struct tty *tp) 1053{ 1054 MPASS(!tty_gone(tp)); 1055 1056 /* Simulate carrier removal. */ 1057 ttydisc_modem(tp, 0); 1058 1059 /* Wake up all blocked threads. */ 1060 tty_wakeup(tp, FREAD|FWRITE); 1061 cv_broadcast(&tp->t_bgwait); 1062 cv_broadcast(&tp->t_dcdwait); 1063 1064 tp->t_flags |= TF_GONE; 1065 tty_rel_free(tp); 1066} 1067 1068/* 1069 * Exposing information about current TTY's through sysctl 1070 */ 1071 1072static void 1073tty_to_xtty(struct tty *tp, struct xtty *xt) 1074{ 1075 tty_lock_assert(tp, MA_OWNED); 1076 1077 xt->xt_size = sizeof(struct xtty); 1078 xt->xt_insize = ttyinq_getsize(&tp->t_inq); 1079 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq); 1080 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq); 1081 xt->xt_inlow = tp->t_inlow; 1082 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq); 1083 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq); 1084 xt->xt_outlow = tp->t_outlow; 1085 xt->xt_column = tp->t_column; 1086 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1087 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0; 1088 xt->xt_flags = tp->t_flags; 1089 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV; 1090} 1091 1092static int 1093sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 1094{ 1095 unsigned long lsize; 1096 struct xtty *xtlist, *xt; 1097 struct tty *tp; 1098 int error; 1099 1100 sx_slock(&tty_list_sx); 1101 lsize = tty_list_count * sizeof(struct xtty); 1102 if (lsize == 0) { 1103 sx_sunlock(&tty_list_sx); 1104 return (0); 1105 } 1106 1107 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK); 1108 1109 TAILQ_FOREACH(tp, &tty_list, t_list) { 1110 tty_lock(tp); 1111 tty_to_xtty(tp, xt); 1112 tty_unlock(tp); 1113 xt++; 1114 } 1115 sx_sunlock(&tty_list_sx); 1116 1117 error = SYSCTL_OUT(req, xtlist, lsize); 1118 free(xtlist, M_TTY); 1119 return (error); 1120} 1121 1122SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 1123 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs"); 1124 1125/* 1126 * Device node creation. Device has been set up, now we can expose it to 1127 * the user. 1128 */ 1129 1130void 1131tty_makedev(struct tty *tp, struct ucred *cred, const char *fmt, ...) 1132{ 1133 va_list ap; 1134 struct cdev *dev; 1135 const char *prefix = "tty"; 1136 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */ 1137 uid_t uid; 1138 gid_t gid; 1139 mode_t mode; 1140 1141 /* Remove "tty" prefix from devices like PTY's. */ 1142 if (tp->t_flags & TF_NOPREFIX) 1143 prefix = ""; 1144 1145 va_start(ap, fmt); 1146 vsnrprintf(name, sizeof name, 32, fmt, ap); 1147 va_end(ap); 1148 1149 if (cred == NULL) { 1150 /* System device. */ 1151 uid = UID_ROOT; 1152 gid = GID_WHEEL; 1153 mode = S_IRUSR|S_IWUSR; 1154 } else { 1155 /* User device. */ 1156 uid = cred->cr_ruid; 1157 gid = GID_TTY; 1158 mode = S_IRUSR|S_IWUSR|S_IWGRP; 1159 } 1160 1161 /* Master call-in device. */ 1162 dev = make_dev_cred(&ttydev_cdevsw, 0, cred, 1163 uid, gid, mode, "%s%s", prefix, name); 1164 dev->si_drv1 = tp; 1165 tp->t_dev = dev; 1166 1167 /* Slave call-in devices. */ 1168 if (tp->t_flags & TF_INITLOCK) { 1169 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1170 uid, gid, mode, "%s%s.init", prefix, name); 1171 dev_depends(tp->t_dev, dev); 1172 dev->si_drv1 = tp; 1173 dev->si_drv2 = &tp->t_termios_init_in; 1174 1175 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1176 uid, gid, mode, "%s%s.lock", prefix, name); 1177 dev_depends(tp->t_dev, dev); 1178 dev->si_drv1 = tp; 1179 dev->si_drv2 = &tp->t_termios_lock_in; 1180 } 1181 1182 /* Call-out devices. */ 1183 if (tp->t_flags & TF_CALLOUT) { 1184 dev = make_dev_cred(&ttydev_cdevsw, 0, cred, 1185 UID_UUCP, GID_DIALER, 0660, "cua%s", name); 1186 dev_depends(tp->t_dev, dev); 1187 dev->si_drv1 = tp; 1188 1189 /* Slave call-out devices. */ 1190 if (tp->t_flags & TF_INITLOCK) { 1191 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1192 UID_UUCP, GID_DIALER, 0660, "cua%s.init", name); 1193 dev_depends(tp->t_dev, dev); 1194 dev->si_drv1 = tp; 1195 dev->si_drv2 = &tp->t_termios_init_out; 1196 1197 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1198 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", name); 1199 dev_depends(tp->t_dev, dev); 1200 dev->si_drv1 = tp; 1201 dev->si_drv2 = &tp->t_termios_lock_out; 1202 } 1203 } 1204} 1205 1206/* 1207 * Signalling processes. 1208 */ 1209 1210void 1211tty_signal_sessleader(struct tty *tp, int sig) 1212{ 1213 struct proc *p; 1214 1215 tty_lock_assert(tp, MA_OWNED); 1216 MPASS(sig >= 1 && sig < NSIG); 1217 1218 /* Make signals start output again. */ 1219 tp->t_flags &= ~TF_STOPPED; 1220 1221 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) { 1222 p = tp->t_session->s_leader; 1223 PROC_LOCK(p); 1224 psignal(p, sig); 1225 PROC_UNLOCK(p); 1226 } 1227} 1228 1229void 1230tty_signal_pgrp(struct tty *tp, int sig) 1231{ 1232 tty_lock_assert(tp, MA_OWNED); 1233 MPASS(sig >= 1 && sig < NSIG); 1234 1235 /* Make signals start output again. */ 1236 tp->t_flags &= ~TF_STOPPED; 1237 1238 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO)) 1239 tty_info(tp); 1240 if (tp->t_pgrp != NULL) { 1241 PGRP_LOCK(tp->t_pgrp); 1242 pgsignal(tp->t_pgrp, sig, 1); 1243 PGRP_UNLOCK(tp->t_pgrp); 1244 } 1245} 1246 1247void 1248tty_wakeup(struct tty *tp, int flags) 1249{ 1250 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL) 1251 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 1252 1253 if (flags & FWRITE) { 1254 cv_broadcast(&tp->t_outwait); 1255 selwakeup(&tp->t_outpoll); 1256 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0); 1257 } 1258 if (flags & FREAD) { 1259 cv_broadcast(&tp->t_inwait); 1260 selwakeup(&tp->t_inpoll); 1261 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0); 1262 } 1263} 1264 1265int 1266tty_wait(struct tty *tp, struct cv *cv) 1267{ 1268 int error; 1269 int revokecnt = tp->t_revokecnt; 1270 1271 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1272 MPASS(!tty_gone(tp)); 1273 1274 error = cv_wait_sig(cv, tp->t_mtx); 1275 1276 /* Restart the system call when we may have been revoked. */ 1277 if (tp->t_revokecnt != revokecnt) 1278 return (ERESTART); 1279 1280 /* Bail out when the device slipped away. */ 1281 if (tty_gone(tp)) 1282 return (ENXIO); 1283 1284 return (error); 1285} 1286 1287int 1288tty_timedwait(struct tty *tp, struct cv *cv, int hz) 1289{ 1290 int error; 1291 int revokecnt = tp->t_revokecnt; 1292 1293 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1294 MPASS(!tty_gone(tp)); 1295 1296 error = cv_timedwait_sig(cv, tp->t_mtx, hz); 1297 1298 /* Restart the system call when we may have been revoked. */ 1299 if (tp->t_revokecnt != revokecnt) 1300 return (ERESTART); 1301 1302 /* Bail out when the device slipped away. */ 1303 if (tty_gone(tp)) 1304 return (ENXIO); 1305 1306 return (error); 1307} 1308 1309void 1310tty_flush(struct tty *tp, int flags) 1311{ 1312 if (flags & FWRITE) { 1313 tp->t_flags &= ~TF_HIWAT_OUT; 1314 ttyoutq_flush(&tp->t_outq); 1315 tty_wakeup(tp, FWRITE); 1316 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE); 1317 } 1318 if (flags & FREAD) { 1319 tty_hiwat_in_unblock(tp); 1320 ttyinq_flush(&tp->t_inq); 1321 ttydevsw_inwakeup(tp); 1322 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD); 1323 } 1324} 1325 1326static int 1327tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, struct thread *td) 1328{ 1329 int error; 1330 1331 switch (cmd) { 1332 /* 1333 * Modem commands. 1334 * The SER_* and TIOCM_* flags are the same, but one bit 1335 * shifted. I don't know why. 1336 */ 1337 case TIOCSDTR: 1338 ttydevsw_modem(tp, SER_DTR, 0); 1339 return (0); 1340 case TIOCCDTR: 1341 ttydevsw_modem(tp, 0, SER_DTR); 1342 return (0); 1343 case TIOCMSET: { 1344 int bits = *(int *)data; 1345 ttydevsw_modem(tp, 1346 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 1347 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1348 return (0); 1349 } 1350 case TIOCMBIS: { 1351 int bits = *(int *)data; 1352 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0); 1353 return (0); 1354 } 1355 case TIOCMBIC: { 1356 int bits = *(int *)data; 1357 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1358 return (0); 1359 } 1360 case TIOCMGET: 1361 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1); 1362 return (0); 1363 1364 case FIOASYNC: 1365 if (*(int *)data) 1366 tp->t_flags |= TF_ASYNC; 1367 else 1368 tp->t_flags &= ~TF_ASYNC; 1369 return (0); 1370 case FIONBIO: 1371 /* This device supports non-blocking operation. */ 1372 return (0); 1373 case FIONREAD: 1374 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq); 1375 return (0); 1376 case FIONWRITE: 1377 case TIOCOUTQ: 1378 *(int *)data = ttyoutq_bytesused(&tp->t_outq); 1379 return (0); 1380 case FIOSETOWN: 1381 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1382 /* Not allowed to set ownership. */ 1383 return (ENOTTY); 1384 1385 /* Temporarily unlock the TTY to set ownership. */ 1386 tty_unlock(tp); 1387 error = fsetown(*(int *)data, &tp->t_sigio); 1388 tty_lock(tp); 1389 return (error); 1390 case FIOGETOWN: 1391 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1392 /* Not allowed to set ownership. */ 1393 return (ENOTTY); 1394 1395 /* Get ownership. */ 1396 *(int *)data = fgetown(&tp->t_sigio); 1397 return (0); 1398 case TIOCGETA: 1399 /* Obtain terminal flags through tcgetattr(). */ 1400 *(struct termios*)data = tp->t_termios; 1401 return (0); 1402 case TIOCSETA: 1403 case TIOCSETAW: 1404 case TIOCSETAF: { 1405 struct termios *t = data; 1406 1407 /* 1408 * Who makes up these funny rules? According to POSIX, 1409 * input baud rate is set equal to the output baud rate 1410 * when zero. 1411 */ 1412 if (t->c_ispeed == 0) 1413 t->c_ispeed = t->c_ospeed; 1414 1415 /* Discard any unsupported bits. */ 1416 t->c_iflag &= TTYSUP_IFLAG; 1417 t->c_oflag &= TTYSUP_OFLAG; 1418 t->c_lflag &= TTYSUP_LFLAG; 1419 t->c_cflag &= TTYSUP_CFLAG; 1420 1421 /* Set terminal flags through tcsetattr(). */ 1422 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1423 error = tty_drain(tp); 1424 if (error) 1425 return (error); 1426 if (cmd == TIOCSETAF) 1427 tty_flush(tp, FREAD); 1428 } 1429 1430 /* 1431 * Only call param() when the flags really change. 1432 */ 1433 if ((t->c_cflag & CIGNORE) == 0 && 1434 (tp->t_termios.c_cflag != t->c_cflag || 1435 tp->t_termios.c_ispeed != t->c_ispeed || 1436 tp->t_termios.c_ospeed != t->c_ospeed)) { 1437 error = ttydevsw_param(tp, t); 1438 if (error) 1439 return (error); 1440 1441 /* XXX: CLOCAL? */ 1442 1443 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE; 1444 tp->t_termios.c_ispeed = t->c_ispeed; 1445 tp->t_termios.c_ospeed = t->c_ospeed; 1446 1447 /* Baud rate has changed - update watermarks. */ 1448 tty_watermarks(tp); 1449 } 1450 1451 /* Copy new non-device driver parameters. */ 1452 tp->t_termios.c_iflag = t->c_iflag; 1453 tp->t_termios.c_oflag = t->c_oflag; 1454 tp->t_termios.c_lflag = t->c_lflag; 1455 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc); 1456 1457 ttydisc_optimize(tp); 1458 1459 if ((t->c_lflag & ICANON) == 0) { 1460 /* 1461 * When in non-canonical mode, wake up all 1462 * readers. Canonicalize any partial input. VMIN 1463 * and VTIME could also be adjusted. 1464 */ 1465 ttyinq_canonicalize(&tp->t_inq); 1466 tty_wakeup(tp, FREAD); 1467 } 1468 1469 /* 1470 * For packet mode: notify the PTY consumer that VSTOP 1471 * and VSTART may have been changed. 1472 */ 1473 if (tp->t_termios.c_iflag & IXON && 1474 tp->t_termios.c_cc[VSTOP] == CTRL('S') && 1475 tp->t_termios.c_cc[VSTART] == CTRL('Q')) 1476 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP); 1477 else 1478 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP); 1479 return (0); 1480 } 1481 case TIOCGETD: 1482 /* For compatibility - we only support TTYDISC. */ 1483 *(int *)data = TTYDISC; 1484 return (0); 1485 case TIOCGPGRP: 1486 if (!tty_is_ctty(tp, td->td_proc)) 1487 return (ENOTTY); 1488 1489 if (tp->t_pgrp != NULL) 1490 *(int *)data = tp->t_pgrp->pg_id; 1491 else 1492 *(int *)data = NO_PID; 1493 return (0); 1494 case TIOCGSID: 1495 if (!tty_is_ctty(tp, td->td_proc)) 1496 return (ENOTTY); 1497 1498 MPASS(tp->t_session); 1499 *(int *)data = tp->t_session->s_sid; 1500 return (0); 1501 case TIOCSCTTY: { 1502 struct proc *p = td->td_proc; 1503 1504 /* XXX: This looks awful. */ 1505 tty_unlock(tp); 1506 sx_xlock(&proctree_lock); 1507 tty_lock(tp); 1508 1509 if (!SESS_LEADER(p)) { 1510 /* Only the session leader may do this. */ 1511 sx_xunlock(&proctree_lock); 1512 return (EPERM); 1513 } 1514 1515 if (tp->t_session != NULL && tp->t_session == p->p_session) { 1516 /* This is already our controlling TTY. */ 1517 sx_xunlock(&proctree_lock); 1518 return (0); 1519 } 1520 1521 if (p->p_session->s_ttyp != NULL || 1522 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL && 1523 tp->t_session->s_ttyvp->v_type != VBAD)) { 1524 /* 1525 * There is already a relation between a TTY and 1526 * a session, or the caller is not the session 1527 * leader. 1528 * 1529 * Allow the TTY to be stolen when the vnode is 1530 * invalid, but the reference to the TTY is 1531 * still active. This allows immediate reuse of 1532 * TTYs of which the session leader has been 1533 * killed or the TTY revoked. 1534 */ 1535 sx_xunlock(&proctree_lock); 1536 return (EPERM); 1537 } 1538 1539 /* Connect the session to the TTY. */ 1540 tp->t_session = p->p_session; 1541 tp->t_session->s_ttyp = tp; 1542 tp->t_sessioncnt++; 1543 sx_xunlock(&proctree_lock); 1544 1545 /* Assign foreground process group. */ 1546 tp->t_pgrp = p->p_pgrp; 1547 PROC_LOCK(p); 1548 p->p_flag |= P_CONTROLT; 1549 PROC_UNLOCK(p); 1550 1551 return (0); 1552 } 1553 case TIOCSPGRP: { 1554 struct pgrp *pg; 1555 1556 /* 1557 * XXX: Temporarily unlock the TTY to locate the process 1558 * group. This code would be lot nicer if we would ever 1559 * decompose proctree_lock. 1560 */ 1561 tty_unlock(tp); 1562 sx_slock(&proctree_lock); 1563 pg = pgfind(*(int *)data); 1564 if (pg != NULL) 1565 PGRP_UNLOCK(pg); 1566 if (pg == NULL || pg->pg_session != td->td_proc->p_session) { 1567 sx_sunlock(&proctree_lock); 1568 tty_lock(tp); 1569 return (EPERM); 1570 } 1571 tty_lock(tp); 1572 1573 /* 1574 * Determine if this TTY is the controlling TTY after 1575 * relocking the TTY. 1576 */ 1577 if (!tty_is_ctty(tp, td->td_proc)) { 1578 sx_sunlock(&proctree_lock); 1579 return (ENOTTY); 1580 } 1581 tp->t_pgrp = pg; 1582 sx_sunlock(&proctree_lock); 1583 1584 /* Wake up the background process groups. */ 1585 cv_broadcast(&tp->t_bgwait); 1586 return (0); 1587 } 1588 case TIOCFLUSH: { 1589 int flags = *(int *)data; 1590 1591 if (flags == 0) 1592 flags = (FREAD|FWRITE); 1593 else 1594 flags &= (FREAD|FWRITE); 1595 tty_flush(tp, flags); 1596 return (0); 1597 } 1598 case TIOCDRAIN: 1599 /* Drain TTY output. */ 1600 return tty_drain(tp); 1601 case TIOCCONS: 1602 /* Set terminal as console TTY. */ 1603 if (*(int *)data) { 1604 error = priv_check(td, PRIV_TTY_CONSOLE); 1605 if (error) 1606 return (error); 1607 1608 /* 1609 * XXX: constty should really need to be locked! 1610 * XXX: allow disconnected constty's to be stolen! 1611 */ 1612 1613 if (constty == tp) 1614 return (0); 1615 if (constty != NULL) 1616 return (EBUSY); 1617 1618 tty_unlock(tp); 1619 constty_set(tp); 1620 tty_lock(tp); 1621 } else if (constty == tp) { 1622 constty_clear(); 1623 } 1624 return (0); 1625 case TIOCGWINSZ: 1626 /* Obtain window size. */ 1627 *(struct winsize*)data = tp->t_winsize; 1628 return (0); 1629 case TIOCSWINSZ: 1630 /* Set window size. */ 1631 if (bcmp(&tp->t_winsize, data, sizeof(struct winsize)) == 0) 1632 return (0); 1633 tp->t_winsize = *(struct winsize*)data; 1634 tty_signal_pgrp(tp, SIGWINCH); 1635 return (0); 1636 case TIOCEXCL: 1637 tp->t_flags |= TF_EXCLUDE; 1638 return (0); 1639 case TIOCNXCL: 1640 tp->t_flags &= ~TF_EXCLUDE; 1641 return (0); 1642 case TIOCSTOP: 1643 tp->t_flags |= TF_STOPPED; 1644 ttydevsw_pktnotify(tp, TIOCPKT_STOP); 1645 return (0); 1646 case TIOCSTART: 1647 tp->t_flags &= ~TF_STOPPED; 1648 ttydevsw_outwakeup(tp); 1649 ttydevsw_pktnotify(tp, TIOCPKT_START); 1650 return (0); 1651 case TIOCSTAT: 1652 tty_info(tp); 1653 return (0); 1654 } 1655 1656#ifdef COMPAT_43TTY 1657 return tty_ioctl_compat(tp, cmd, data, td); 1658#else /* !COMPAT_43TTY */ 1659 return (ENOIOCTL); 1660#endif /* COMPAT_43TTY */ 1661} 1662 1663int 1664tty_ioctl(struct tty *tp, u_long cmd, void *data, struct thread *td) 1665{ 1666 int error; 1667 1668 tty_lock_assert(tp, MA_OWNED); 1669 1670 if (tty_gone(tp)) 1671 return (ENXIO); 1672 1673 error = ttydevsw_ioctl(tp, cmd, data, td); 1674 if (error == ENOIOCTL) 1675 error = tty_generic_ioctl(tp, cmd, data, td); 1676 1677 return (error); 1678} 1679 1680dev_t 1681tty_udev(struct tty *tp) 1682{ 1683 if (tp->t_dev) 1684 return dev2udev(tp->t_dev); 1685 else 1686 return NODEV; 1687} 1688 1689int 1690tty_checkoutq(struct tty *tp) 1691{ 1692 1693 /* 256 bytes should be enough to print a log message. */ 1694 return (ttyoutq_bytesleft(&tp->t_outq) >= 256); 1695} 1696 1697void 1698tty_hiwat_in_block(struct tty *tp) 1699{ 1700 1701 if ((tp->t_flags & TF_HIWAT_IN) == 0 && 1702 tp->t_termios.c_iflag & IXOFF && 1703 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) { 1704 /* 1705 * Input flow control. Only enter the high watermark when we 1706 * can successfully store the VSTOP character. 1707 */ 1708 if (ttyoutq_write_nofrag(&tp->t_outq, 1709 &tp->t_termios.c_cc[VSTOP], 1) == 0) 1710 tp->t_flags |= TF_HIWAT_IN; 1711 } else { 1712 /* No input flow control. */ 1713 tp->t_flags |= TF_HIWAT_IN; 1714 } 1715} 1716 1717void 1718tty_hiwat_in_unblock(struct tty *tp) 1719{ 1720 1721 if (tp->t_flags & TF_HIWAT_IN && 1722 tp->t_termios.c_iflag & IXOFF && 1723 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) { 1724 /* 1725 * Input flow control. Only leave the high watermark when we 1726 * can successfully store the VSTART character. 1727 */ 1728 if (ttyoutq_write_nofrag(&tp->t_outq, 1729 &tp->t_termios.c_cc[VSTART], 1) == 0) 1730 tp->t_flags &= ~TF_HIWAT_IN; 1731 } else { 1732 /* No input flow control. */ 1733 tp->t_flags &= ~TF_HIWAT_IN; 1734 } 1735 1736 if (!tty_gone(tp)) 1737 ttydevsw_inwakeup(tp); 1738} 1739 1740/* 1741 * TTY hooks interface. 1742 */ 1743 1744static int 1745ttyhook_defrint(struct tty *tp, char c, int flags) 1746{ 1747 1748 if (ttyhook_rint_bypass(tp, &c, 1) != 1) 1749 return (-1); 1750 1751 return (0); 1752} 1753 1754int 1755ttyhook_register(struct tty **rtp, struct proc *p, int fd, 1756 struct ttyhook *th, void *softc) 1757{ 1758 struct tty *tp; 1759 struct file *fp; 1760 struct cdev *dev; 1761 struct cdevsw *cdp; 1762 struct filedesc *fdp; 1763 int error; 1764 1765 /* Validate the file descriptor. */ 1766 if ((fdp = p->p_fd) == NULL) 1767 return (EBADF); 1768 1769 fp = fget_unlocked(fdp, fd); 1770 if (fp == NULL) 1771 return (EBADF); 1772 if (fp->f_ops == &badfileops) { 1773 error = EBADF; 1774 goto done1; 1775 } 1776 1777 /* 1778 * Make sure the vnode is bound to a character device. 1779 * Unlocked check for the vnode type is ok there, because we 1780 * only shall prevent calling devvn_refthread on the file that 1781 * never has been opened over a character device. 1782 */ 1783 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) { 1784 error = EINVAL; 1785 goto done1; 1786 } 1787 1788 /* Make sure it is a TTY. */ 1789 cdp = devvn_refthread(fp->f_vnode, &dev); 1790 if (cdp == NULL) { 1791 error = ENXIO; 1792 goto done1; 1793 } 1794 if (dev != fp->f_data) { 1795 error = ENXIO; 1796 goto done2; 1797 } 1798 if (cdp != &ttydev_cdevsw) { 1799 error = ENOTTY; 1800 goto done2; 1801 } 1802 tp = dev->si_drv1; 1803 1804 /* Try to attach the hook to the TTY. */ 1805 error = EBUSY; 1806 tty_lock(tp); 1807 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0)); 1808 if (tp->t_flags & TF_HOOK) 1809 goto done3; 1810 1811 tp->t_flags |= TF_HOOK; 1812 tp->t_hook = th; 1813 tp->t_hooksoftc = softc; 1814 *rtp = tp; 1815 error = 0; 1816 1817 /* Maybe we can switch into bypass mode now. */ 1818 ttydisc_optimize(tp); 1819 1820 /* Silently convert rint() calls to rint_bypass() when possible. */ 1821 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass)) 1822 th->th_rint = ttyhook_defrint; 1823 1824done3: tty_unlock(tp); 1825done2: dev_relthread(dev); 1826done1: fdrop(fp, curthread); 1827 return (error); 1828} 1829 1830void 1831ttyhook_unregister(struct tty *tp) 1832{ 1833 1834 tty_lock_assert(tp, MA_OWNED); 1835 MPASS(tp->t_flags & TF_HOOK); 1836 1837 /* Disconnect the hook. */ 1838 tp->t_flags &= ~TF_HOOK; 1839 tp->t_hook = NULL; 1840 1841 /* Maybe we need to leave bypass mode. */ 1842 ttydisc_optimize(tp); 1843 1844 /* Maybe deallocate the TTY as well. */ 1845 tty_rel_free(tp); 1846} 1847 1848/* 1849 * /dev/console handling. 1850 */ 1851 1852static int 1853ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 1854{ 1855 struct tty *tp; 1856 1857 /* System has no console device. */ 1858 if (dev_console_filename == NULL) 1859 return (ENXIO); 1860 1861 /* Look up corresponding TTY by device name. */ 1862 sx_slock(&tty_list_sx); 1863 TAILQ_FOREACH(tp, &tty_list, t_list) { 1864 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) { 1865 dev_console->si_drv1 = tp; 1866 break; 1867 } 1868 } 1869 sx_sunlock(&tty_list_sx); 1870 1871 /* System console has no TTY associated. */ 1872 if (dev_console->si_drv1 == NULL) 1873 return (ENXIO); 1874 1875 return (ttydev_open(dev, oflags, devtype, td)); 1876} 1877 1878static int 1879ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag) 1880{ 1881 1882 log_console(uio); 1883 1884 return (ttydev_write(dev, uio, ioflag)); 1885} 1886 1887/* 1888 * /dev/console is a little different than normal TTY's. When opened, 1889 * it determines which TTY to use. When data gets written to it, it 1890 * will be logged in the kernel message buffer. 1891 */ 1892static struct cdevsw ttyconsdev_cdevsw = { 1893 .d_version = D_VERSION, 1894 .d_open = ttyconsdev_open, 1895 .d_close = ttydev_close, 1896 .d_read = ttydev_read, 1897 .d_write = ttyconsdev_write, 1898 .d_ioctl = ttydev_ioctl, 1899 .d_kqfilter = ttydev_kqfilter, 1900 .d_poll = ttydev_poll, 1901 .d_mmap = ttydev_mmap, 1902 .d_name = "ttyconsdev", 1903 .d_flags = D_TTY, 1904}; 1905 1906static void 1907ttyconsdev_init(void *unused) 1908{ 1909 1910 dev_console = make_dev(&ttyconsdev_cdevsw, 0, UID_ROOT, GID_WHEEL, 1911 0600, "console"); 1912} 1913 1914SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL); 1915 1916void 1917ttyconsdev_select(const char *name) 1918{ 1919 1920 dev_console_filename = name; 1921} 1922 1923/* 1924 * Debugging routines. 1925 */ 1926 1927#include "opt_ddb.h" 1928#ifdef DDB 1929#include <ddb/ddb.h> 1930#include <ddb/db_sym.h> 1931 1932static struct { 1933 int flag; 1934 char val; 1935} ttystates[] = { 1936#if 0 1937 { TF_NOPREFIX, 'N' }, 1938#endif 1939 { TF_INITLOCK, 'I' }, 1940 { TF_CALLOUT, 'C' }, 1941 1942 /* Keep these together -> 'Oi' and 'Oo'. */ 1943 { TF_OPENED, 'O' }, 1944 { TF_OPENED_IN, 'i' }, 1945 { TF_OPENED_OUT, 'o' }, 1946 { TF_OPENED_CONS, 'c' }, 1947 1948 { TF_GONE, 'G' }, 1949 { TF_OPENCLOSE, 'B' }, 1950 { TF_ASYNC, 'Y' }, 1951 { TF_LITERAL, 'L' }, 1952 1953 /* Keep these together -> 'Hi' and 'Ho'. */ 1954 { TF_HIWAT, 'H' }, 1955 { TF_HIWAT_IN, 'i' }, 1956 { TF_HIWAT_OUT, 'o' }, 1957 1958 { TF_STOPPED, 'S' }, 1959 { TF_EXCLUDE, 'X' }, 1960 { TF_BYPASS, 'l' }, 1961 { TF_ZOMBIE, 'Z' }, 1962 { TF_HOOK, 's' }, 1963 1964 /* Keep these together -> 'bi' and 'bo'. */ 1965 { TF_BUSY, 'b' }, 1966 { TF_BUSY_IN, 'i' }, 1967 { TF_BUSY_OUT, 'o' }, 1968 1969 { 0, '\0'}, 1970}; 1971 1972#define TTY_FLAG_BITS \ 1973 "\20\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \ 1974 "\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \ 1975 "\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK" 1976 1977#define DB_PRINTSYM(name, addr) \ 1978 db_printf("%s " #name ": ", sep); \ 1979 db_printsym((db_addr_t) addr, DB_STGY_ANY); \ 1980 db_printf("\n"); 1981 1982static void 1983_db_show_devsw(const char *sep, const struct ttydevsw *tsw) 1984{ 1985 db_printf("%sdevsw: ", sep); 1986 db_printsym((db_addr_t)tsw, DB_STGY_ANY); 1987 db_printf(" (%p)\n", tsw); 1988 DB_PRINTSYM(open, tsw->tsw_open); 1989 DB_PRINTSYM(close, tsw->tsw_close); 1990 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup); 1991 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup); 1992 DB_PRINTSYM(ioctl, tsw->tsw_ioctl); 1993 DB_PRINTSYM(param, tsw->tsw_param); 1994 DB_PRINTSYM(modem, tsw->tsw_modem); 1995 DB_PRINTSYM(mmap, tsw->tsw_mmap); 1996 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify); 1997 DB_PRINTSYM(free, tsw->tsw_free); 1998} 1999static void 2000_db_show_hooks(const char *sep, const struct ttyhook *th) 2001{ 2002 db_printf("%shook: ", sep); 2003 db_printsym((db_addr_t)th, DB_STGY_ANY); 2004 db_printf(" (%p)\n", th); 2005 if (th == NULL) 2006 return; 2007 DB_PRINTSYM(rint, th->th_rint); 2008 DB_PRINTSYM(rint_bypass, th->th_rint_bypass); 2009 DB_PRINTSYM(rint_done, th->th_rint_done); 2010 DB_PRINTSYM(rint_poll, th->th_rint_poll); 2011 DB_PRINTSYM(getc_inject, th->th_getc_inject); 2012 DB_PRINTSYM(getc_capture, th->th_getc_capture); 2013 DB_PRINTSYM(getc_poll, th->th_getc_poll); 2014 DB_PRINTSYM(close, th->th_close); 2015} 2016 2017static void 2018_db_show_termios(const char *name, const struct termios *t) 2019{ 2020 2021 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x " 2022 "lflag 0x%x ispeed %u ospeed %u\n", name, 2023 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag, 2024 t->c_ispeed, t->c_ospeed); 2025} 2026 2027/* DDB command to show TTY statistics. */ 2028DB_SHOW_COMMAND(tty, db_show_tty) 2029{ 2030 struct tty *tp; 2031 2032 if (!have_addr) { 2033 db_printf("usage: show tty <addr>\n"); 2034 return; 2035 } 2036 tp = (struct tty *)addr; 2037 2038 db_printf("0x%p: %s\n", tp, tty_devname(tp)); 2039 db_printf("\tmtx: %p\n", tp->t_mtx); 2040 db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS); 2041 db_printf("\trevokecnt: %u\n", tp->t_revokecnt); 2042 2043 /* Buffering mechanisms. */ 2044 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u " 2045 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin, 2046 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end, 2047 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota); 2048 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n", 2049 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end, 2050 tp->t_outq.to_nblocks, tp->t_outq.to_quota); 2051 db_printf("\tinlow: %zu\n", tp->t_inlow); 2052 db_printf("\toutlow: %zu\n", tp->t_outlow); 2053 _db_show_termios("\ttermios", &tp->t_termios); 2054 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n", 2055 tp->t_winsize.ws_row, tp->t_winsize.ws_col, 2056 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel); 2057 db_printf("\tcolumn: %u\n", tp->t_column); 2058 db_printf("\twritepos: %u\n", tp->t_writepos); 2059 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags); 2060 2061 /* Init/lock-state devices. */ 2062 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in); 2063 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out); 2064 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in); 2065 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out); 2066 2067 /* Hooks */ 2068 _db_show_devsw("\t", tp->t_devsw); 2069 _db_show_hooks("\t", tp->t_hook); 2070 2071 /* Process info. */ 2072 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp, 2073 tp->t_pgrp ? tp->t_pgrp->pg_id : 0, 2074 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0); 2075 db_printf("\tsession: %p", tp->t_session); 2076 if (tp->t_session != NULL) 2077 db_printf(" count %u leader %p tty %p sid %d login %s", 2078 tp->t_session->s_count, tp->t_session->s_leader, 2079 tp->t_session->s_ttyp, tp->t_session->s_sid, 2080 tp->t_session->s_login); 2081 db_printf("\n"); 2082 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt); 2083 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc); 2084 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc); 2085 db_printf("\tdev: %p\n", tp->t_dev); 2086} 2087 2088/* DDB command to list TTYs. */ 2089DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys) 2090{ 2091 struct tty *tp; 2092 size_t isiz, osiz; 2093 int i, j; 2094 2095 /* Make the output look like `pstat -t'. */ 2096 db_printf("PTR "); 2097#if defined(__LP64__) 2098 db_printf(" "); 2099#endif 2100 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW " 2101 "COL SESS PGID STATE\n"); 2102 2103 TAILQ_FOREACH(tp, &tty_list, t_list) { 2104 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE; 2105 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE; 2106 2107 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ", 2108 tp, 2109 tty_devname(tp), 2110 isiz, 2111 tp->t_inq.ti_linestart - tp->t_inq.ti_begin, 2112 tp->t_inq.ti_end - tp->t_inq.ti_linestart, 2113 isiz - tp->t_inlow, 2114 osiz, 2115 tp->t_outq.to_end - tp->t_outq.to_begin, 2116 osiz - tp->t_outlow, 2117 MIN(tp->t_column, 99999), 2118 tp->t_session ? tp->t_session->s_sid : 0, 2119 tp->t_pgrp ? tp->t_pgrp->pg_id : 0); 2120 2121 /* Flag bits. */ 2122 for (i = j = 0; ttystates[i].flag; i++) 2123 if (tp->t_flags & ttystates[i].flag) { 2124 db_printf("%c", ttystates[i].val); 2125 j++; 2126 } 2127 if (j == 0) 2128 db_printf("-"); 2129 db_printf("\n"); 2130 } 2131} 2132#endif /* DDB */ 2133