tty.c revision 201532
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 201532 2010-01-04 20:59:52Z ed $"); 32 33#include "opt_compat.h" 34 35#include <sys/param.h> 36#include <sys/conf.h> 37#include <sys/cons.h> 38#include <sys/fcntl.h> 39#include <sys/file.h> 40#include <sys/filedesc.h> 41#include <sys/filio.h> 42#ifdef COMPAT_43TTY 43#include <sys/ioctl_compat.h> 44#endif /* COMPAT_43TTY */ 45#include <sys/kernel.h> 46#include <sys/limits.h> 47#include <sys/malloc.h> 48#include <sys/mount.h> 49#include <sys/poll.h> 50#include <sys/priv.h> 51#include <sys/proc.h> 52#include <sys/serial.h> 53#include <sys/signal.h> 54#include <sys/stat.h> 55#include <sys/sx.h> 56#include <sys/sysctl.h> 57#include <sys/systm.h> 58#include <sys/tty.h> 59#include <sys/ttycom.h> 60#define TTYDEFCHARS 61#include <sys/ttydefaults.h> 62#undef TTYDEFCHARS 63#include <sys/ucred.h> 64#include <sys/vnode.h> 65 66#include <machine/stdarg.h> 67 68static MALLOC_DEFINE(M_TTY, "tty", "tty device"); 69 70static void tty_rel_free(struct tty *tp); 71 72static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list); 73static struct sx tty_list_sx; 74SX_SYSINIT(tty_list, &tty_list_sx, "tty list"); 75static unsigned int tty_list_count = 0; 76 77/* Character device of /dev/console. */ 78static struct cdev *dev_console; 79static const char *dev_console_filename; 80 81/* 82 * Flags that are supported and stored by this implementation. 83 */ 84#define TTYSUP_IFLAG (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK|ISTRIP|\ 85 INLCR|IGNCR|ICRNL|IXON|IXOFF|IXANY|IMAXBEL) 86#define TTYSUP_OFLAG (OPOST|ONLCR|TAB3|ONOEOT|OCRNL|ONOCR|ONLRET) 87#define TTYSUP_LFLAG (ECHOKE|ECHOE|ECHOK|ECHO|ECHONL|ECHOPRT|\ 88 ECHOCTL|ISIG|ICANON|ALTWERASE|IEXTEN|TOSTOP|\ 89 FLUSHO|NOKERNINFO|NOFLSH) 90#define TTYSUP_CFLAG (CIGNORE|CSIZE|CSTOPB|CREAD|PARENB|PARODD|\ 91 HUPCL|CLOCAL|CCTS_OFLOW|CRTS_IFLOW|CDTR_IFLOW|\ 92 CDSR_OFLOW|CCAR_OFLOW) 93 94#define TTY_CALLOUT(tp,d) ((d) != (tp)->t_dev && (d) != dev_console) 95 96/* 97 * Set TTY buffer sizes. 98 */ 99 100#define TTYBUF_MAX 65536 101 102static void 103tty_watermarks(struct tty *tp) 104{ 105 size_t bs = 0; 106 107 /* Provide an input buffer for 0.2 seconds of data. */ 108 if (tp->t_termios.c_cflag & CREAD) 109 bs = MIN(tp->t_termios.c_ispeed / 5, TTYBUF_MAX); 110 ttyinq_setsize(&tp->t_inq, tp, bs); 111 112 /* Set low watermark at 10% (when 90% is available). */ 113 tp->t_inlow = (ttyinq_getallocatedsize(&tp->t_inq) * 9) / 10; 114 115 /* Provide an ouput buffer for 0.2 seconds of data. */ 116 bs = MIN(tp->t_termios.c_ospeed / 5, TTYBUF_MAX); 117 ttyoutq_setsize(&tp->t_outq, tp, bs); 118 119 /* Set low watermark at 10% (when 90% is available). */ 120 tp->t_outlow = (ttyoutq_getallocatedsize(&tp->t_outq) * 9) / 10; 121} 122 123static int 124tty_drain(struct tty *tp) 125{ 126 int error; 127 128 if (ttyhook_hashook(tp, getc_inject)) 129 /* buffer is inaccessible */ 130 return (0); 131 132 while (ttyoutq_bytesused(&tp->t_outq) > 0) { 133 ttydevsw_outwakeup(tp); 134 /* Could be handled synchronously. */ 135 if (ttyoutq_bytesused(&tp->t_outq) == 0) 136 return (0); 137 138 /* Wait for data to be drained. */ 139 error = tty_wait(tp, &tp->t_outwait); 140 if (error) 141 return (error); 142 } 143 144 return (0); 145} 146 147/* 148 * Though ttydev_enter() and ttydev_leave() seem to be related, they 149 * don't have to be used together. ttydev_enter() is used by the cdev 150 * operations to prevent an actual operation from being processed when 151 * the TTY has been abandoned. ttydev_leave() is used by ttydev_open() 152 * and ttydev_close() to determine whether per-TTY data should be 153 * deallocated. 154 */ 155 156static __inline int 157ttydev_enter(struct tty *tp) 158{ 159 tty_lock(tp); 160 161 if (tty_gone(tp) || !tty_opened(tp)) { 162 /* Device is already gone. */ 163 tty_unlock(tp); 164 return (ENXIO); 165 } 166 167 return (0); 168} 169 170static void 171ttydev_leave(struct tty *tp) 172{ 173 tty_lock_assert(tp, MA_OWNED); 174 175 if (tty_opened(tp) || tp->t_flags & TF_OPENCLOSE) { 176 /* Device is still opened somewhere. */ 177 tty_unlock(tp); 178 return; 179 } 180 181 tp->t_flags |= TF_OPENCLOSE; 182 183 /* Stop asynchronous I/O. */ 184 funsetown(&tp->t_sigio); 185 186 /* Remove console TTY. */ 187 if (constty == tp) 188 constty_clear(); 189 190 /* Drain any output. */ 191 MPASS((tp->t_flags & TF_STOPPED) == 0); 192 if (!tty_gone(tp)) 193 tty_drain(tp); 194 195 ttydisc_close(tp); 196 197 /* Destroy associated buffers already. */ 198 ttyinq_free(&tp->t_inq); 199 tp->t_inlow = 0; 200 ttyoutq_free(&tp->t_outq); 201 tp->t_outlow = 0; 202 203 knlist_clear(&tp->t_inpoll.si_note, 1); 204 knlist_clear(&tp->t_outpoll.si_note, 1); 205 206 if (!tty_gone(tp)) 207 ttydevsw_close(tp); 208 209 tp->t_flags &= ~TF_OPENCLOSE; 210 cv_broadcast(&tp->t_dcdwait); 211 tty_rel_free(tp); 212} 213 214/* 215 * Operations that are exposed through the character device in /dev. 216 */ 217static int 218ttydev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 219{ 220 struct tty *tp = dev->si_drv1; 221 int error = 0; 222 223 tty_lock(tp); 224 if (tty_gone(tp)) { 225 /* Device is already gone. */ 226 tty_unlock(tp); 227 return (ENXIO); 228 } 229 230 /* 231 * Block when other processes are currently opening or closing 232 * the TTY. 233 */ 234 while (tp->t_flags & TF_OPENCLOSE) { 235 error = tty_wait(tp, &tp->t_dcdwait); 236 if (error != 0) { 237 tty_unlock(tp); 238 return (error); 239 } 240 } 241 tp->t_flags |= TF_OPENCLOSE; 242 243 /* 244 * Make sure the "tty" and "cua" device cannot be opened at the 245 * same time. 246 */ 247 if (TTY_CALLOUT(tp, dev)) { 248 if (tp->t_flags & TF_OPENED_IN) { 249 error = EBUSY; 250 goto done; 251 } 252 } else { 253 if (tp->t_flags & TF_OPENED_OUT) { 254 error = EBUSY; 255 goto done; 256 } 257 } 258 259 if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) { 260 error = EBUSY; 261 goto done; 262 } 263 264 if (!tty_opened(tp)) { 265 /* Set proper termios flags. */ 266 if (TTY_CALLOUT(tp, dev)) { 267 tp->t_termios = tp->t_termios_init_out; 268 } else { 269 tp->t_termios = tp->t_termios_init_in; 270 } 271 ttydevsw_param(tp, &tp->t_termios); 272 273 ttydevsw_modem(tp, SER_DTR|SER_RTS, 0); 274 275 error = ttydevsw_open(tp); 276 if (error != 0) 277 goto done; 278 279 ttydisc_open(tp); 280 tty_watermarks(tp); 281 } 282 283 /* Wait for Carrier Detect. */ 284 if (!TTY_CALLOUT(tp, dev) && (oflags & O_NONBLOCK) == 0 && 285 (tp->t_termios.c_cflag & CLOCAL) == 0) { 286 while ((ttydevsw_modem(tp, 0, 0) & SER_DCD) == 0) { 287 error = tty_wait(tp, &tp->t_dcdwait); 288 if (error != 0) 289 goto done; 290 } 291 } 292 293 if (dev == dev_console) 294 tp->t_flags |= TF_OPENED_CONS; 295 else if (TTY_CALLOUT(tp, dev)) 296 tp->t_flags |= TF_OPENED_OUT; 297 else 298 tp->t_flags |= TF_OPENED_IN; 299 300done: tp->t_flags &= ~TF_OPENCLOSE; 301 cv_broadcast(&tp->t_dcdwait); 302 ttydev_leave(tp); 303 304 return (error); 305} 306 307static int 308ttydev_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 309{ 310 struct tty *tp = dev->si_drv1; 311 312 tty_lock(tp); 313 314 /* 315 * Don't actually close the device if it is being used as the 316 * console. 317 */ 318 MPASS((tp->t_flags & TF_OPENED) != TF_OPENED); 319 if (dev == dev_console) 320 tp->t_flags &= ~TF_OPENED_CONS; 321 else 322 tp->t_flags &= ~(TF_OPENED_IN|TF_OPENED_OUT); 323 324 if (tp->t_flags & TF_OPENED) { 325 tty_unlock(tp); 326 return (0); 327 } 328 329 /* 330 * This can only be called once. The callin and the callout 331 * devices cannot be opened at the same time. 332 */ 333 tp->t_flags &= ~(TF_EXCLUDE|TF_STOPPED); 334 335 /* Properly wake up threads that are stuck - revoke(). */ 336 tp->t_revokecnt++; 337 tty_wakeup(tp, FREAD|FWRITE); 338 cv_broadcast(&tp->t_bgwait); 339 cv_broadcast(&tp->t_dcdwait); 340 341 ttydev_leave(tp); 342 343 return (0); 344} 345 346static __inline int 347tty_is_ctty(struct tty *tp, struct proc *p) 348{ 349 tty_lock_assert(tp, MA_OWNED); 350 351 return (p->p_session == tp->t_session && p->p_flag & P_CONTROLT); 352} 353 354static int 355tty_wait_background(struct tty *tp, struct thread *td, int sig) 356{ 357 struct proc *p = td->td_proc; 358 struct pgrp *pg; 359 ksiginfo_t ksi; 360 int error; 361 362 MPASS(sig == SIGTTIN || sig == SIGTTOU); 363 tty_lock_assert(tp, MA_OWNED); 364 365 for (;;) { 366 PROC_LOCK(p); 367 /* 368 * The process should only sleep, when: 369 * - This terminal is the controling terminal 370 * - Its process group is not the foreground process 371 * group 372 * - The parent process isn't waiting for the child to 373 * exit 374 * - the signal to send to the process isn't masked 375 */ 376 if (!tty_is_ctty(tp, p) || p->p_pgrp == tp->t_pgrp) { 377 /* Allow the action to happen. */ 378 PROC_UNLOCK(p); 379 return (0); 380 } 381 382 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, sig) || 383 SIGISMEMBER(td->td_sigmask, sig)) { 384 /* Only allow them in write()/ioctl(). */ 385 PROC_UNLOCK(p); 386 return (sig == SIGTTOU ? 0 : EIO); 387 } 388 389 pg = p->p_pgrp; 390 if (p->p_flag & P_PPWAIT || pg->pg_jobc == 0) { 391 /* Don't allow the action to happen. */ 392 PROC_UNLOCK(p); 393 return (EIO); 394 } 395 PROC_UNLOCK(p); 396 397 /* 398 * Send the signal and sleep until we're the new 399 * foreground process group. 400 */ 401 if (sig != 0) { 402 ksiginfo_init(&ksi); 403 ksi.ksi_code = SI_KERNEL; 404 ksi.ksi_signo = sig; 405 sig = 0; 406 } 407 PGRP_LOCK(pg); 408 pgsignal(pg, ksi.ksi_signo, 1, &ksi); 409 PGRP_UNLOCK(pg); 410 411 error = tty_wait(tp, &tp->t_bgwait); 412 if (error) 413 return (error); 414 } 415} 416 417static int 418ttydev_read(struct cdev *dev, struct uio *uio, int ioflag) 419{ 420 struct tty *tp = dev->si_drv1; 421 int error; 422 423 error = ttydev_enter(tp); 424 if (error) 425 goto done; 426 427 error = tty_wait_background(tp, curthread, SIGTTIN); 428 if (error) { 429 tty_unlock(tp); 430 goto done; 431 } 432 433 error = ttydisc_read(tp, uio, ioflag); 434 tty_unlock(tp); 435 436 /* 437 * The read() call should not throw an error when the device is 438 * being destroyed. Silently convert it to an EOF. 439 */ 440done: if (error == ENXIO) 441 error = 0; 442 return (error); 443} 444 445static int 446ttydev_write(struct cdev *dev, struct uio *uio, int ioflag) 447{ 448 struct tty *tp = dev->si_drv1; 449 int error; 450 451 error = ttydev_enter(tp); 452 if (error) 453 return (error); 454 455 if (tp->t_termios.c_lflag & TOSTOP) { 456 error = tty_wait_background(tp, curthread, SIGTTOU); 457 if (error) 458 goto done; 459 } 460 461 if (ioflag & IO_NDELAY && tp->t_flags & TF_BUSY_OUT) { 462 /* Allow non-blocking writes to bypass serialization. */ 463 error = ttydisc_write(tp, uio, ioflag); 464 } else { 465 /* Serialize write() calls. */ 466 while (tp->t_flags & TF_BUSY_OUT) { 467 error = tty_wait(tp, &tp->t_outserwait); 468 if (error) 469 goto done; 470 } 471 472 tp->t_flags |= TF_BUSY_OUT; 473 error = ttydisc_write(tp, uio, ioflag); 474 tp->t_flags &= ~TF_BUSY_OUT; 475 cv_signal(&tp->t_outserwait); 476 } 477 478done: tty_unlock(tp); 479 return (error); 480} 481 482static int 483ttydev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 484 struct thread *td) 485{ 486 struct tty *tp = dev->si_drv1; 487 int error; 488 489 error = ttydev_enter(tp); 490 if (error) 491 return (error); 492 493 switch (cmd) { 494 case TIOCCBRK: 495 case TIOCCONS: 496 case TIOCDRAIN: 497 case TIOCEXCL: 498 case TIOCFLUSH: 499 case TIOCNXCL: 500 case TIOCSBRK: 501 case TIOCSCTTY: 502 case TIOCSETA: 503 case TIOCSETAF: 504 case TIOCSETAW: 505 case TIOCSPGRP: 506 case TIOCSTART: 507 case TIOCSTAT: 508 case TIOCSTI: 509 case TIOCSTOP: 510 case TIOCSWINSZ: 511#if 0 512 case TIOCSDRAINWAIT: 513 case TIOCSETD: 514#endif 515#ifdef COMPAT_43TTY 516 case TIOCLBIC: 517 case TIOCLBIS: 518 case TIOCLSET: 519 case TIOCSETC: 520 case OTIOCSETD: 521 case TIOCSETN: 522 case TIOCSETP: 523 case TIOCSLTC: 524#endif /* COMPAT_43TTY */ 525 /* 526 * If the ioctl() causes the TTY to be modified, let it 527 * wait in the background. 528 */ 529 error = tty_wait_background(tp, curthread, SIGTTOU); 530 if (error) 531 goto done; 532 } 533 534 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 535 struct termios *old = &tp->t_termios; 536 struct termios *new = (struct termios *)data; 537 struct termios *lock = TTY_CALLOUT(tp, dev) ? 538 &tp->t_termios_lock_out : &tp->t_termios_lock_in; 539 int cc; 540 541 /* 542 * Lock state devices. Just overwrite the values of the 543 * commands that are currently in use. 544 */ 545 new->c_iflag = (old->c_iflag & lock->c_iflag) | 546 (new->c_iflag & ~lock->c_iflag); 547 new->c_oflag = (old->c_oflag & lock->c_oflag) | 548 (new->c_oflag & ~lock->c_oflag); 549 new->c_cflag = (old->c_cflag & lock->c_cflag) | 550 (new->c_cflag & ~lock->c_cflag); 551 new->c_lflag = (old->c_lflag & lock->c_lflag) | 552 (new->c_lflag & ~lock->c_lflag); 553 for (cc = 0; cc < NCCS; ++cc) 554 if (lock->c_cc[cc]) 555 new->c_cc[cc] = old->c_cc[cc]; 556 if (lock->c_ispeed) 557 new->c_ispeed = old->c_ispeed; 558 if (lock->c_ospeed) 559 new->c_ospeed = old->c_ospeed; 560 } 561 562 error = tty_ioctl(tp, cmd, data, fflag, td); 563done: tty_unlock(tp); 564 565 return (error); 566} 567 568static int 569ttydev_poll(struct cdev *dev, int events, struct thread *td) 570{ 571 struct tty *tp = dev->si_drv1; 572 int error, revents = 0; 573 574 error = ttydev_enter(tp); 575 if (error) 576 return ((events & (POLLIN|POLLRDNORM)) | POLLHUP); 577 578 if (events & (POLLIN|POLLRDNORM)) { 579 /* See if we can read something. */ 580 if (ttydisc_read_poll(tp) > 0) 581 revents |= events & (POLLIN|POLLRDNORM); 582 } 583 584 if (tp->t_flags & TF_ZOMBIE) { 585 /* Hangup flag on zombie state. */ 586 revents |= POLLHUP; 587 } else if (events & (POLLOUT|POLLWRNORM)) { 588 /* See if we can write something. */ 589 if (ttydisc_write_poll(tp) > 0) 590 revents |= events & (POLLOUT|POLLWRNORM); 591 } 592 593 if (revents == 0) { 594 if (events & (POLLIN|POLLRDNORM)) 595 selrecord(td, &tp->t_inpoll); 596 if (events & (POLLOUT|POLLWRNORM)) 597 selrecord(td, &tp->t_outpoll); 598 } 599 600 tty_unlock(tp); 601 602 return (revents); 603} 604 605static int 606ttydev_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 607 int nprot, vm_memattr_t *memattr) 608{ 609 struct tty *tp = dev->si_drv1; 610 int error; 611 612 /* Handle mmap() through the driver. */ 613 614 error = ttydev_enter(tp); 615 if (error) 616 return (-1); 617 error = ttydevsw_mmap(tp, offset, paddr, nprot, memattr); 618 tty_unlock(tp); 619 620 return (error); 621} 622 623/* 624 * kqueue support. 625 */ 626 627static void 628tty_kqops_read_detach(struct knote *kn) 629{ 630 struct tty *tp = kn->kn_hook; 631 632 knlist_remove(&tp->t_inpoll.si_note, kn, 0); 633} 634 635static int 636tty_kqops_read_event(struct knote *kn, long hint) 637{ 638 struct tty *tp = kn->kn_hook; 639 640 tty_lock_assert(tp, MA_OWNED); 641 642 if (tty_gone(tp) || tp->t_flags & TF_ZOMBIE) { 643 kn->kn_flags |= EV_EOF; 644 return (1); 645 } else { 646 kn->kn_data = ttydisc_read_poll(tp); 647 return (kn->kn_data > 0); 648 } 649} 650 651static void 652tty_kqops_write_detach(struct knote *kn) 653{ 654 struct tty *tp = kn->kn_hook; 655 656 knlist_remove(&tp->t_outpoll.si_note, kn, 0); 657} 658 659static int 660tty_kqops_write_event(struct knote *kn, long hint) 661{ 662 struct tty *tp = kn->kn_hook; 663 664 tty_lock_assert(tp, MA_OWNED); 665 666 if (tty_gone(tp)) { 667 kn->kn_flags |= EV_EOF; 668 return (1); 669 } else { 670 kn->kn_data = ttydisc_write_poll(tp); 671 return (kn->kn_data > 0); 672 } 673} 674 675static struct filterops tty_kqops_read = { 676 .f_isfd = 1, 677 .f_detach = tty_kqops_read_detach, 678 .f_event = tty_kqops_read_event, 679}; 680static struct filterops tty_kqops_write = { 681 .f_isfd = 1, 682 .f_detach = tty_kqops_write_detach, 683 .f_event = tty_kqops_write_event, 684}; 685 686static int 687ttydev_kqfilter(struct cdev *dev, struct knote *kn) 688{ 689 struct tty *tp = dev->si_drv1; 690 int error; 691 692 error = ttydev_enter(tp); 693 if (error) 694 return (error); 695 696 switch (kn->kn_filter) { 697 case EVFILT_READ: 698 kn->kn_hook = tp; 699 kn->kn_fop = &tty_kqops_read; 700 knlist_add(&tp->t_inpoll.si_note, kn, 1); 701 break; 702 case EVFILT_WRITE: 703 kn->kn_hook = tp; 704 kn->kn_fop = &tty_kqops_write; 705 knlist_add(&tp->t_outpoll.si_note, kn, 1); 706 break; 707 default: 708 error = EINVAL; 709 break; 710 } 711 712 tty_unlock(tp); 713 return (error); 714} 715 716static struct cdevsw ttydev_cdevsw = { 717 .d_version = D_VERSION, 718 .d_open = ttydev_open, 719 .d_close = ttydev_close, 720 .d_read = ttydev_read, 721 .d_write = ttydev_write, 722 .d_ioctl = ttydev_ioctl, 723 .d_kqfilter = ttydev_kqfilter, 724 .d_poll = ttydev_poll, 725 .d_mmap = ttydev_mmap, 726 .d_name = "ttydev", 727 .d_flags = D_TTY, 728}; 729 730/* 731 * Init/lock-state devices 732 */ 733 734static int 735ttyil_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 736{ 737 struct tty *tp = dev->si_drv1; 738 int error = 0; 739 740 tty_lock(tp); 741 if (tty_gone(tp)) 742 error = ENODEV; 743 tty_unlock(tp); 744 745 return (error); 746} 747 748static int 749ttyil_close(struct cdev *dev, int flag, int mode, struct thread *td) 750{ 751 return (0); 752} 753 754static int 755ttyil_rdwr(struct cdev *dev, struct uio *uio, int ioflag) 756{ 757 return (ENODEV); 758} 759 760static int 761ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 762 struct thread *td) 763{ 764 struct tty *tp = dev->si_drv1; 765 int error = 0; 766 767 tty_lock(tp); 768 if (tty_gone(tp)) { 769 error = ENODEV; 770 goto done; 771 } 772 773 switch (cmd) { 774 case TIOCGETA: 775 /* Obtain terminal flags through tcgetattr(). */ 776 *(struct termios*)data = *(struct termios*)dev->si_drv2; 777 break; 778 case TIOCSETA: 779 /* Set terminal flags through tcsetattr(). */ 780 error = priv_check(td, PRIV_TTY_SETA); 781 if (error) 782 break; 783 *(struct termios*)dev->si_drv2 = *(struct termios*)data; 784 break; 785 case TIOCGETD: 786 *(int *)data = TTYDISC; 787 break; 788 case TIOCGWINSZ: 789 bzero(data, sizeof(struct winsize)); 790 break; 791 default: 792 error = ENOTTY; 793 } 794 795done: tty_unlock(tp); 796 return (error); 797} 798 799static struct cdevsw ttyil_cdevsw = { 800 .d_version = D_VERSION, 801 .d_open = ttyil_open, 802 .d_close = ttyil_close, 803 .d_read = ttyil_rdwr, 804 .d_write = ttyil_rdwr, 805 .d_ioctl = ttyil_ioctl, 806 .d_name = "ttyil", 807 .d_flags = D_TTY, 808}; 809 810static void 811tty_init_termios(struct tty *tp) 812{ 813 struct termios *t = &tp->t_termios_init_in; 814 815 t->c_cflag = TTYDEF_CFLAG; 816 t->c_iflag = TTYDEF_IFLAG; 817 t->c_lflag = TTYDEF_LFLAG; 818 t->c_oflag = TTYDEF_OFLAG; 819 t->c_ispeed = TTYDEF_SPEED; 820 t->c_ospeed = TTYDEF_SPEED; 821 memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars); 822 823 tp->t_termios_init_out = *t; 824} 825 826void 827tty_init_console(struct tty *tp, speed_t s) 828{ 829 struct termios *ti = &tp->t_termios_init_in; 830 struct termios *to = &tp->t_termios_init_out; 831 832 if (s != 0) { 833 ti->c_ispeed = ti->c_ospeed = s; 834 to->c_ispeed = to->c_ospeed = s; 835 } 836 837 ti->c_cflag |= CLOCAL; 838 to->c_cflag |= CLOCAL; 839} 840 841/* 842 * Standard device routine implementations, mostly meant for 843 * pseudo-terminal device drivers. When a driver creates a new terminal 844 * device class, missing routines are patched. 845 */ 846 847static int 848ttydevsw_defopen(struct tty *tp) 849{ 850 851 return (0); 852} 853 854static void 855ttydevsw_defclose(struct tty *tp) 856{ 857} 858 859static void 860ttydevsw_defoutwakeup(struct tty *tp) 861{ 862 863 panic("Terminal device has output, while not implemented"); 864} 865 866static void 867ttydevsw_definwakeup(struct tty *tp) 868{ 869} 870 871static int 872ttydevsw_defioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td) 873{ 874 875 return (ENOIOCTL); 876} 877 878static int 879ttydevsw_defparam(struct tty *tp, struct termios *t) 880{ 881 882 /* 883 * Allow the baud rate to be adjusted for pseudo-devices, but at 884 * least restrict it to 115200 to prevent excessive buffer 885 * usage. Also disallow 0, to prevent foot shooting. 886 */ 887 if (t->c_ispeed < B50) 888 t->c_ispeed = B50; 889 else if (t->c_ispeed > B115200) 890 t->c_ispeed = B115200; 891 if (t->c_ospeed < B50) 892 t->c_ospeed = B50; 893 else if (t->c_ospeed > B115200) 894 t->c_ospeed = B115200; 895 t->c_cflag |= CREAD; 896 897 return (0); 898} 899 900static int 901ttydevsw_defmodem(struct tty *tp, int sigon, int sigoff) 902{ 903 904 /* Simulate a carrier to make the TTY layer happy. */ 905 return (SER_DCD); 906} 907 908static int 909ttydevsw_defmmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t *paddr, 910 int nprot, vm_memattr_t *memattr) 911{ 912 913 return (-1); 914} 915 916static void 917ttydevsw_defpktnotify(struct tty *tp, char event) 918{ 919} 920 921static void 922ttydevsw_deffree(void *softc) 923{ 924 925 panic("Terminal device freed without a free-handler"); 926} 927 928/* 929 * TTY allocation and deallocation. TTY devices can be deallocated when 930 * the driver doesn't use it anymore, when the TTY isn't a session's 931 * controlling TTY and when the device node isn't opened through devfs. 932 */ 933 934struct tty * 935tty_alloc(struct ttydevsw *tsw, void *sc) 936{ 937 938 return (tty_alloc_mutex(tsw, sc, NULL)); 939} 940 941struct tty * 942tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex) 943{ 944 struct tty *tp; 945 946 /* Make sure the driver defines all routines. */ 947#define PATCH_FUNC(x) do { \ 948 if (tsw->tsw_ ## x == NULL) \ 949 tsw->tsw_ ## x = ttydevsw_def ## x; \ 950} while (0) 951 PATCH_FUNC(open); 952 PATCH_FUNC(close); 953 PATCH_FUNC(outwakeup); 954 PATCH_FUNC(inwakeup); 955 PATCH_FUNC(ioctl); 956 PATCH_FUNC(param); 957 PATCH_FUNC(modem); 958 PATCH_FUNC(mmap); 959 PATCH_FUNC(pktnotify); 960 PATCH_FUNC(free); 961#undef PATCH_FUNC 962 963 tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO); 964 tp->t_devsw = tsw; 965 tp->t_devswsoftc = sc; 966 tp->t_flags = tsw->tsw_flags; 967 968 tty_init_termios(tp); 969 970 cv_init(&tp->t_inwait, "ttyin"); 971 cv_init(&tp->t_outwait, "ttyout"); 972 cv_init(&tp->t_outserwait, "ttyosr"); 973 cv_init(&tp->t_bgwait, "ttybg"); 974 cv_init(&tp->t_dcdwait, "ttydcd"); 975 976 /* Allow drivers to use a custom mutex to lock the TTY. */ 977 if (mutex != NULL) { 978 tp->t_mtx = mutex; 979 } else { 980 tp->t_mtx = &tp->t_mtxobj; 981 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF); 982 } 983 984 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx); 985 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx); 986 987 sx_xlock(&tty_list_sx); 988 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 989 tty_list_count++; 990 sx_xunlock(&tty_list_sx); 991 992 return (tp); 993} 994 995static void 996tty_dealloc(void *arg) 997{ 998 struct tty *tp = arg; 999 1000 sx_xlock(&tty_list_sx); 1001 TAILQ_REMOVE(&tty_list, tp, t_list); 1002 tty_list_count--; 1003 sx_xunlock(&tty_list_sx); 1004 1005 /* Make sure we haven't leaked buffers. */ 1006 MPASS(ttyinq_getsize(&tp->t_inq) == 0); 1007 MPASS(ttyoutq_getsize(&tp->t_outq) == 0); 1008 1009 knlist_destroy(&tp->t_inpoll.si_note); 1010 knlist_destroy(&tp->t_outpoll.si_note); 1011 1012 cv_destroy(&tp->t_inwait); 1013 cv_destroy(&tp->t_outwait); 1014 cv_destroy(&tp->t_bgwait); 1015 cv_destroy(&tp->t_dcdwait); 1016 cv_destroy(&tp->t_outserwait); 1017 1018 if (tp->t_mtx == &tp->t_mtxobj) 1019 mtx_destroy(&tp->t_mtxobj); 1020 ttydevsw_free(tp); 1021 free(tp, M_TTY); 1022} 1023 1024static void 1025tty_rel_free(struct tty *tp) 1026{ 1027 struct cdev *dev; 1028 1029 tty_lock_assert(tp, MA_OWNED); 1030 1031#define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE) 1032 if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) { 1033 /* TTY is still in use. */ 1034 tty_unlock(tp); 1035 return; 1036 } 1037 1038 /* TTY can be deallocated. */ 1039 dev = tp->t_dev; 1040 tp->t_dev = NULL; 1041 tty_unlock(tp); 1042 1043 destroy_dev_sched_cb(dev, tty_dealloc, tp); 1044} 1045 1046void 1047tty_rel_pgrp(struct tty *tp, struct pgrp *pg) 1048{ 1049 MPASS(tp->t_sessioncnt > 0); 1050 tty_lock_assert(tp, MA_OWNED); 1051 1052 if (tp->t_pgrp == pg) 1053 tp->t_pgrp = NULL; 1054 1055 tty_unlock(tp); 1056} 1057 1058void 1059tty_rel_sess(struct tty *tp, struct session *sess) 1060{ 1061 MPASS(tp->t_sessioncnt > 0); 1062 1063 /* Current session has left. */ 1064 if (tp->t_session == sess) { 1065 tp->t_session = NULL; 1066 MPASS(tp->t_pgrp == NULL); 1067 } 1068 tp->t_sessioncnt--; 1069 tty_rel_free(tp); 1070} 1071 1072void 1073tty_rel_gone(struct tty *tp) 1074{ 1075 MPASS(!tty_gone(tp)); 1076 1077 /* Simulate carrier removal. */ 1078 ttydisc_modem(tp, 0); 1079 1080 /* Wake up all blocked threads. */ 1081 tty_wakeup(tp, FREAD|FWRITE); 1082 cv_broadcast(&tp->t_bgwait); 1083 cv_broadcast(&tp->t_dcdwait); 1084 1085 tp->t_flags |= TF_GONE; 1086 tty_rel_free(tp); 1087} 1088 1089/* 1090 * Exposing information about current TTY's through sysctl 1091 */ 1092 1093static void 1094tty_to_xtty(struct tty *tp, struct xtty *xt) 1095{ 1096 tty_lock_assert(tp, MA_OWNED); 1097 1098 xt->xt_size = sizeof(struct xtty); 1099 xt->xt_insize = ttyinq_getsize(&tp->t_inq); 1100 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq); 1101 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq); 1102 xt->xt_inlow = tp->t_inlow; 1103 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq); 1104 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq); 1105 xt->xt_outlow = tp->t_outlow; 1106 xt->xt_column = tp->t_column; 1107 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1108 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0; 1109 xt->xt_flags = tp->t_flags; 1110 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV; 1111} 1112 1113static int 1114sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 1115{ 1116 unsigned long lsize; 1117 struct xtty *xtlist, *xt; 1118 struct tty *tp; 1119 int error; 1120 1121 sx_slock(&tty_list_sx); 1122 lsize = tty_list_count * sizeof(struct xtty); 1123 if (lsize == 0) { 1124 sx_sunlock(&tty_list_sx); 1125 return (0); 1126 } 1127 1128 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK); 1129 1130 TAILQ_FOREACH(tp, &tty_list, t_list) { 1131 tty_lock(tp); 1132 tty_to_xtty(tp, xt); 1133 tty_unlock(tp); 1134 xt++; 1135 } 1136 sx_sunlock(&tty_list_sx); 1137 1138 error = SYSCTL_OUT(req, xtlist, lsize); 1139 free(xtlist, M_TTY); 1140 return (error); 1141} 1142 1143SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 1144 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs"); 1145 1146/* 1147 * Device node creation. Device has been set up, now we can expose it to 1148 * the user. 1149 */ 1150 1151void 1152tty_makedev(struct tty *tp, struct ucred *cred, const char *fmt, ...) 1153{ 1154 va_list ap; 1155 struct cdev *dev; 1156 const char *prefix = "tty"; 1157 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */ 1158 uid_t uid; 1159 gid_t gid; 1160 mode_t mode; 1161 1162 /* Remove "tty" prefix from devices like PTY's. */ 1163 if (tp->t_flags & TF_NOPREFIX) 1164 prefix = ""; 1165 1166 va_start(ap, fmt); 1167 vsnrprintf(name, sizeof name, 32, fmt, ap); 1168 va_end(ap); 1169 1170 if (cred == NULL) { 1171 /* System device. */ 1172 uid = UID_ROOT; 1173 gid = GID_WHEEL; 1174 mode = S_IRUSR|S_IWUSR; 1175 } else { 1176 /* User device. */ 1177 uid = cred->cr_ruid; 1178 gid = GID_TTY; 1179 mode = S_IRUSR|S_IWUSR|S_IWGRP; 1180 } 1181 1182 /* Master call-in device. */ 1183 dev = make_dev_cred(&ttydev_cdevsw, 0, cred, 1184 uid, gid, mode, "%s%s", prefix, name); 1185 dev->si_drv1 = tp; 1186 tp->t_dev = dev; 1187 1188 /* Slave call-in devices. */ 1189 if (tp->t_flags & TF_INITLOCK) { 1190 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1191 uid, gid, mode, "%s%s.init", prefix, name); 1192 dev_depends(tp->t_dev, dev); 1193 dev->si_drv1 = tp; 1194 dev->si_drv2 = &tp->t_termios_init_in; 1195 1196 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1197 uid, gid, mode, "%s%s.lock", prefix, name); 1198 dev_depends(tp->t_dev, dev); 1199 dev->si_drv1 = tp; 1200 dev->si_drv2 = &tp->t_termios_lock_in; 1201 } 1202 1203 /* Call-out devices. */ 1204 if (tp->t_flags & TF_CALLOUT) { 1205 dev = make_dev_cred(&ttydev_cdevsw, 0, cred, 1206 UID_UUCP, GID_DIALER, 0660, "cua%s", name); 1207 dev_depends(tp->t_dev, dev); 1208 dev->si_drv1 = tp; 1209 1210 /* Slave call-out devices. */ 1211 if (tp->t_flags & TF_INITLOCK) { 1212 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1213 UID_UUCP, GID_DIALER, 0660, "cua%s.init", name); 1214 dev_depends(tp->t_dev, dev); 1215 dev->si_drv1 = tp; 1216 dev->si_drv2 = &tp->t_termios_init_out; 1217 1218 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1219 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", name); 1220 dev_depends(tp->t_dev, dev); 1221 dev->si_drv1 = tp; 1222 dev->si_drv2 = &tp->t_termios_lock_out; 1223 } 1224 } 1225} 1226 1227/* 1228 * Signalling processes. 1229 */ 1230 1231void 1232tty_signal_sessleader(struct tty *tp, int sig) 1233{ 1234 struct proc *p; 1235 1236 tty_lock_assert(tp, MA_OWNED); 1237 MPASS(sig >= 1 && sig < NSIG); 1238 1239 /* Make signals start output again. */ 1240 tp->t_flags &= ~TF_STOPPED; 1241 1242 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) { 1243 p = tp->t_session->s_leader; 1244 PROC_LOCK(p); 1245 psignal(p, sig); 1246 PROC_UNLOCK(p); 1247 } 1248} 1249 1250void 1251tty_signal_pgrp(struct tty *tp, int sig) 1252{ 1253 ksiginfo_t ksi; 1254 1255 tty_lock_assert(tp, MA_OWNED); 1256 MPASS(sig >= 1 && sig < NSIG); 1257 1258 /* Make signals start output again. */ 1259 tp->t_flags &= ~TF_STOPPED; 1260 1261 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO)) 1262 tty_info(tp); 1263 if (tp->t_pgrp != NULL) { 1264 ksiginfo_init(&ksi); 1265 ksi.ksi_signo = sig; 1266 ksi.ksi_code = SI_KERNEL; 1267 PGRP_LOCK(tp->t_pgrp); 1268 pgsignal(tp->t_pgrp, sig, 1, &ksi); 1269 PGRP_UNLOCK(tp->t_pgrp); 1270 } 1271} 1272 1273void 1274tty_wakeup(struct tty *tp, int flags) 1275{ 1276 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL) 1277 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 1278 1279 if (flags & FWRITE) { 1280 cv_broadcast(&tp->t_outwait); 1281 selwakeup(&tp->t_outpoll); 1282 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0); 1283 } 1284 if (flags & FREAD) { 1285 cv_broadcast(&tp->t_inwait); 1286 selwakeup(&tp->t_inpoll); 1287 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0); 1288 } 1289} 1290 1291int 1292tty_wait(struct tty *tp, struct cv *cv) 1293{ 1294 int error; 1295 int revokecnt = tp->t_revokecnt; 1296 1297 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1298 MPASS(!tty_gone(tp)); 1299 1300 error = cv_wait_sig(cv, tp->t_mtx); 1301 1302 /* Restart the system call when we may have been revoked. */ 1303 if (tp->t_revokecnt != revokecnt) 1304 return (ERESTART); 1305 1306 /* Bail out when the device slipped away. */ 1307 if (tty_gone(tp)) 1308 return (ENXIO); 1309 1310 return (error); 1311} 1312 1313int 1314tty_timedwait(struct tty *tp, struct cv *cv, int hz) 1315{ 1316 int error; 1317 int revokecnt = tp->t_revokecnt; 1318 1319 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1320 MPASS(!tty_gone(tp)); 1321 1322 error = cv_timedwait_sig(cv, tp->t_mtx, hz); 1323 1324 /* Restart the system call when we may have been revoked. */ 1325 if (tp->t_revokecnt != revokecnt) 1326 return (ERESTART); 1327 1328 /* Bail out when the device slipped away. */ 1329 if (tty_gone(tp)) 1330 return (ENXIO); 1331 1332 return (error); 1333} 1334 1335void 1336tty_flush(struct tty *tp, int flags) 1337{ 1338 if (flags & FWRITE) { 1339 tp->t_flags &= ~TF_HIWAT_OUT; 1340 ttyoutq_flush(&tp->t_outq); 1341 tty_wakeup(tp, FWRITE); 1342 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE); 1343 } 1344 if (flags & FREAD) { 1345 tty_hiwat_in_unblock(tp); 1346 ttyinq_flush(&tp->t_inq); 1347 ttydevsw_inwakeup(tp); 1348 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD); 1349 } 1350} 1351 1352static int 1353tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, 1354 struct thread *td) 1355{ 1356 int error; 1357 1358 switch (cmd) { 1359 /* 1360 * Modem commands. 1361 * The SER_* and TIOCM_* flags are the same, but one bit 1362 * shifted. I don't know why. 1363 */ 1364 case TIOCSDTR: 1365 ttydevsw_modem(tp, SER_DTR, 0); 1366 return (0); 1367 case TIOCCDTR: 1368 ttydevsw_modem(tp, 0, SER_DTR); 1369 return (0); 1370 case TIOCMSET: { 1371 int bits = *(int *)data; 1372 ttydevsw_modem(tp, 1373 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 1374 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1375 return (0); 1376 } 1377 case TIOCMBIS: { 1378 int bits = *(int *)data; 1379 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0); 1380 return (0); 1381 } 1382 case TIOCMBIC: { 1383 int bits = *(int *)data; 1384 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1385 return (0); 1386 } 1387 case TIOCMGET: 1388 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1); 1389 return (0); 1390 1391 case FIOASYNC: 1392 if (*(int *)data) 1393 tp->t_flags |= TF_ASYNC; 1394 else 1395 tp->t_flags &= ~TF_ASYNC; 1396 return (0); 1397 case FIONBIO: 1398 /* This device supports non-blocking operation. */ 1399 return (0); 1400 case FIONREAD: 1401 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq); 1402 return (0); 1403 case FIONWRITE: 1404 case TIOCOUTQ: 1405 *(int *)data = ttyoutq_bytesused(&tp->t_outq); 1406 return (0); 1407 case FIOSETOWN: 1408 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1409 /* Not allowed to set ownership. */ 1410 return (ENOTTY); 1411 1412 /* Temporarily unlock the TTY to set ownership. */ 1413 tty_unlock(tp); 1414 error = fsetown(*(int *)data, &tp->t_sigio); 1415 tty_lock(tp); 1416 return (error); 1417 case FIOGETOWN: 1418 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1419 /* Not allowed to set ownership. */ 1420 return (ENOTTY); 1421 1422 /* Get ownership. */ 1423 *(int *)data = fgetown(&tp->t_sigio); 1424 return (0); 1425 case TIOCGETA: 1426 /* Obtain terminal flags through tcgetattr(). */ 1427 *(struct termios*)data = tp->t_termios; 1428 return (0); 1429 case TIOCSETA: 1430 case TIOCSETAW: 1431 case TIOCSETAF: { 1432 struct termios *t = data; 1433 1434 /* 1435 * Who makes up these funny rules? According to POSIX, 1436 * input baud rate is set equal to the output baud rate 1437 * when zero. 1438 */ 1439 if (t->c_ispeed == 0) 1440 t->c_ispeed = t->c_ospeed; 1441 1442 /* Discard any unsupported bits. */ 1443 t->c_iflag &= TTYSUP_IFLAG; 1444 t->c_oflag &= TTYSUP_OFLAG; 1445 t->c_lflag &= TTYSUP_LFLAG; 1446 t->c_cflag &= TTYSUP_CFLAG; 1447 1448 /* Set terminal flags through tcsetattr(). */ 1449 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1450 error = tty_drain(tp); 1451 if (error) 1452 return (error); 1453 if (cmd == TIOCSETAF) 1454 tty_flush(tp, FREAD); 1455 } 1456 1457 /* 1458 * Only call param() when the flags really change. 1459 */ 1460 if ((t->c_cflag & CIGNORE) == 0 && 1461 (tp->t_termios.c_cflag != t->c_cflag || 1462 tp->t_termios.c_ispeed != t->c_ispeed || 1463 tp->t_termios.c_ospeed != t->c_ospeed)) { 1464 error = ttydevsw_param(tp, t); 1465 if (error) 1466 return (error); 1467 1468 /* XXX: CLOCAL? */ 1469 1470 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE; 1471 tp->t_termios.c_ispeed = t->c_ispeed; 1472 tp->t_termios.c_ospeed = t->c_ospeed; 1473 1474 /* Baud rate has changed - update watermarks. */ 1475 tty_watermarks(tp); 1476 } 1477 1478 /* Copy new non-device driver parameters. */ 1479 tp->t_termios.c_iflag = t->c_iflag; 1480 tp->t_termios.c_oflag = t->c_oflag; 1481 tp->t_termios.c_lflag = t->c_lflag; 1482 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc); 1483 1484 ttydisc_optimize(tp); 1485 1486 if ((t->c_lflag & ICANON) == 0) { 1487 /* 1488 * When in non-canonical mode, wake up all 1489 * readers. Canonicalize any partial input. VMIN 1490 * and VTIME could also be adjusted. 1491 */ 1492 ttyinq_canonicalize(&tp->t_inq); 1493 tty_wakeup(tp, FREAD); 1494 } 1495 1496 /* 1497 * For packet mode: notify the PTY consumer that VSTOP 1498 * and VSTART may have been changed. 1499 */ 1500 if (tp->t_termios.c_iflag & IXON && 1501 tp->t_termios.c_cc[VSTOP] == CTRL('S') && 1502 tp->t_termios.c_cc[VSTART] == CTRL('Q')) 1503 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP); 1504 else 1505 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP); 1506 return (0); 1507 } 1508 case TIOCGETD: 1509 /* For compatibility - we only support TTYDISC. */ 1510 *(int *)data = TTYDISC; 1511 return (0); 1512 case TIOCGPGRP: 1513 if (!tty_is_ctty(tp, td->td_proc)) 1514 return (ENOTTY); 1515 1516 if (tp->t_pgrp != NULL) 1517 *(int *)data = tp->t_pgrp->pg_id; 1518 else 1519 *(int *)data = NO_PID; 1520 return (0); 1521 case TIOCGSID: 1522 if (!tty_is_ctty(tp, td->td_proc)) 1523 return (ENOTTY); 1524 1525 MPASS(tp->t_session); 1526 *(int *)data = tp->t_session->s_sid; 1527 return (0); 1528 case TIOCSCTTY: { 1529 struct proc *p = td->td_proc; 1530 1531 /* XXX: This looks awful. */ 1532 tty_unlock(tp); 1533 sx_xlock(&proctree_lock); 1534 tty_lock(tp); 1535 1536 if (!SESS_LEADER(p)) { 1537 /* Only the session leader may do this. */ 1538 sx_xunlock(&proctree_lock); 1539 return (EPERM); 1540 } 1541 1542 if (tp->t_session != NULL && tp->t_session == p->p_session) { 1543 /* This is already our controlling TTY. */ 1544 sx_xunlock(&proctree_lock); 1545 return (0); 1546 } 1547 1548 if (p->p_session->s_ttyp != NULL || 1549 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL && 1550 tp->t_session->s_ttyvp->v_type != VBAD)) { 1551 /* 1552 * There is already a relation between a TTY and 1553 * a session, or the caller is not the session 1554 * leader. 1555 * 1556 * Allow the TTY to be stolen when the vnode is 1557 * invalid, but the reference to the TTY is 1558 * still active. This allows immediate reuse of 1559 * TTYs of which the session leader has been 1560 * killed or the TTY revoked. 1561 */ 1562 sx_xunlock(&proctree_lock); 1563 return (EPERM); 1564 } 1565 1566 /* Connect the session to the TTY. */ 1567 tp->t_session = p->p_session; 1568 tp->t_session->s_ttyp = tp; 1569 tp->t_sessioncnt++; 1570 sx_xunlock(&proctree_lock); 1571 1572 /* Assign foreground process group. */ 1573 tp->t_pgrp = p->p_pgrp; 1574 PROC_LOCK(p); 1575 p->p_flag |= P_CONTROLT; 1576 PROC_UNLOCK(p); 1577 1578 return (0); 1579 } 1580 case TIOCSPGRP: { 1581 struct pgrp *pg; 1582 1583 /* 1584 * XXX: Temporarily unlock the TTY to locate the process 1585 * group. This code would be lot nicer if we would ever 1586 * decompose proctree_lock. 1587 */ 1588 tty_unlock(tp); 1589 sx_slock(&proctree_lock); 1590 pg = pgfind(*(int *)data); 1591 if (pg != NULL) 1592 PGRP_UNLOCK(pg); 1593 if (pg == NULL || pg->pg_session != td->td_proc->p_session) { 1594 sx_sunlock(&proctree_lock); 1595 tty_lock(tp); 1596 return (EPERM); 1597 } 1598 tty_lock(tp); 1599 1600 /* 1601 * Determine if this TTY is the controlling TTY after 1602 * relocking the TTY. 1603 */ 1604 if (!tty_is_ctty(tp, td->td_proc)) { 1605 sx_sunlock(&proctree_lock); 1606 return (ENOTTY); 1607 } 1608 tp->t_pgrp = pg; 1609 sx_sunlock(&proctree_lock); 1610 1611 /* Wake up the background process groups. */ 1612 cv_broadcast(&tp->t_bgwait); 1613 return (0); 1614 } 1615 case TIOCFLUSH: { 1616 int flags = *(int *)data; 1617 1618 if (flags == 0) 1619 flags = (FREAD|FWRITE); 1620 else 1621 flags &= (FREAD|FWRITE); 1622 tty_flush(tp, flags); 1623 return (0); 1624 } 1625 case TIOCDRAIN: 1626 /* Drain TTY output. */ 1627 return tty_drain(tp); 1628 case TIOCCONS: 1629 /* Set terminal as console TTY. */ 1630 if (*(int *)data) { 1631 error = priv_check(td, PRIV_TTY_CONSOLE); 1632 if (error) 1633 return (error); 1634 1635 /* 1636 * XXX: constty should really need to be locked! 1637 * XXX: allow disconnected constty's to be stolen! 1638 */ 1639 1640 if (constty == tp) 1641 return (0); 1642 if (constty != NULL) 1643 return (EBUSY); 1644 1645 tty_unlock(tp); 1646 constty_set(tp); 1647 tty_lock(tp); 1648 } else if (constty == tp) { 1649 constty_clear(); 1650 } 1651 return (0); 1652 case TIOCGWINSZ: 1653 /* Obtain window size. */ 1654 *(struct winsize*)data = tp->t_winsize; 1655 return (0); 1656 case TIOCSWINSZ: 1657 /* Set window size. */ 1658 if (bcmp(&tp->t_winsize, data, sizeof(struct winsize)) == 0) 1659 return (0); 1660 tp->t_winsize = *(struct winsize*)data; 1661 tty_signal_pgrp(tp, SIGWINCH); 1662 return (0); 1663 case TIOCEXCL: 1664 tp->t_flags |= TF_EXCLUDE; 1665 return (0); 1666 case TIOCNXCL: 1667 tp->t_flags &= ~TF_EXCLUDE; 1668 return (0); 1669 case TIOCSTOP: 1670 tp->t_flags |= TF_STOPPED; 1671 ttydevsw_pktnotify(tp, TIOCPKT_STOP); 1672 return (0); 1673 case TIOCSTART: 1674 tp->t_flags &= ~TF_STOPPED; 1675 ttydevsw_outwakeup(tp); 1676 ttydevsw_pktnotify(tp, TIOCPKT_START); 1677 return (0); 1678 case TIOCSTAT: 1679 tty_info(tp); 1680 return (0); 1681 case TIOCSTI: 1682 if ((fflag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI)) 1683 return (EPERM); 1684 if (!tty_is_ctty(tp, td->td_proc) && 1685 priv_check(td, PRIV_TTY_STI)) 1686 return (EACCES); 1687 ttydisc_rint(tp, *(char *)data, 0); 1688 ttydisc_rint_done(tp); 1689 return (0); 1690 } 1691 1692#ifdef COMPAT_43TTY 1693 return tty_ioctl_compat(tp, cmd, data, fflag, td); 1694#else /* !COMPAT_43TTY */ 1695 return (ENOIOCTL); 1696#endif /* COMPAT_43TTY */ 1697} 1698 1699int 1700tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, struct thread *td) 1701{ 1702 int error; 1703 1704 tty_lock_assert(tp, MA_OWNED); 1705 1706 if (tty_gone(tp)) 1707 return (ENXIO); 1708 1709 error = ttydevsw_ioctl(tp, cmd, data, td); 1710 if (error == ENOIOCTL) 1711 error = tty_generic_ioctl(tp, cmd, data, fflag, td); 1712 1713 return (error); 1714} 1715 1716dev_t 1717tty_udev(struct tty *tp) 1718{ 1719 if (tp->t_dev) 1720 return dev2udev(tp->t_dev); 1721 else 1722 return NODEV; 1723} 1724 1725int 1726tty_checkoutq(struct tty *tp) 1727{ 1728 1729 /* 256 bytes should be enough to print a log message. */ 1730 return (ttyoutq_bytesleft(&tp->t_outq) >= 256); 1731} 1732 1733void 1734tty_hiwat_in_block(struct tty *tp) 1735{ 1736 1737 if ((tp->t_flags & TF_HIWAT_IN) == 0 && 1738 tp->t_termios.c_iflag & IXOFF && 1739 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) { 1740 /* 1741 * Input flow control. Only enter the high watermark when we 1742 * can successfully store the VSTOP character. 1743 */ 1744 if (ttyoutq_write_nofrag(&tp->t_outq, 1745 &tp->t_termios.c_cc[VSTOP], 1) == 0) 1746 tp->t_flags |= TF_HIWAT_IN; 1747 } else { 1748 /* No input flow control. */ 1749 tp->t_flags |= TF_HIWAT_IN; 1750 } 1751} 1752 1753void 1754tty_hiwat_in_unblock(struct tty *tp) 1755{ 1756 1757 if (tp->t_flags & TF_HIWAT_IN && 1758 tp->t_termios.c_iflag & IXOFF && 1759 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) { 1760 /* 1761 * Input flow control. Only leave the high watermark when we 1762 * can successfully store the VSTART character. 1763 */ 1764 if (ttyoutq_write_nofrag(&tp->t_outq, 1765 &tp->t_termios.c_cc[VSTART], 1) == 0) 1766 tp->t_flags &= ~TF_HIWAT_IN; 1767 } else { 1768 /* No input flow control. */ 1769 tp->t_flags &= ~TF_HIWAT_IN; 1770 } 1771 1772 if (!tty_gone(tp)) 1773 ttydevsw_inwakeup(tp); 1774} 1775 1776/* 1777 * TTY hooks interface. 1778 */ 1779 1780static int 1781ttyhook_defrint(struct tty *tp, char c, int flags) 1782{ 1783 1784 if (ttyhook_rint_bypass(tp, &c, 1) != 1) 1785 return (-1); 1786 1787 return (0); 1788} 1789 1790int 1791ttyhook_register(struct tty **rtp, struct proc *p, int fd, 1792 struct ttyhook *th, void *softc) 1793{ 1794 struct tty *tp; 1795 struct file *fp; 1796 struct cdev *dev; 1797 struct cdevsw *cdp; 1798 struct filedesc *fdp; 1799 int error; 1800 1801 /* Validate the file descriptor. */ 1802 if ((fdp = p->p_fd) == NULL) 1803 return (EBADF); 1804 1805 fp = fget_unlocked(fdp, fd); 1806 if (fp == NULL) 1807 return (EBADF); 1808 if (fp->f_ops == &badfileops) { 1809 error = EBADF; 1810 goto done1; 1811 } 1812 1813 /* 1814 * Make sure the vnode is bound to a character device. 1815 * Unlocked check for the vnode type is ok there, because we 1816 * only shall prevent calling devvn_refthread on the file that 1817 * never has been opened over a character device. 1818 */ 1819 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) { 1820 error = EINVAL; 1821 goto done1; 1822 } 1823 1824 /* Make sure it is a TTY. */ 1825 cdp = devvn_refthread(fp->f_vnode, &dev); 1826 if (cdp == NULL) { 1827 error = ENXIO; 1828 goto done1; 1829 } 1830 if (dev != fp->f_data) { 1831 error = ENXIO; 1832 goto done2; 1833 } 1834 if (cdp != &ttydev_cdevsw) { 1835 error = ENOTTY; 1836 goto done2; 1837 } 1838 tp = dev->si_drv1; 1839 1840 /* Try to attach the hook to the TTY. */ 1841 error = EBUSY; 1842 tty_lock(tp); 1843 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0)); 1844 if (tp->t_flags & TF_HOOK) 1845 goto done3; 1846 1847 tp->t_flags |= TF_HOOK; 1848 tp->t_hook = th; 1849 tp->t_hooksoftc = softc; 1850 *rtp = tp; 1851 error = 0; 1852 1853 /* Maybe we can switch into bypass mode now. */ 1854 ttydisc_optimize(tp); 1855 1856 /* Silently convert rint() calls to rint_bypass() when possible. */ 1857 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass)) 1858 th->th_rint = ttyhook_defrint; 1859 1860done3: tty_unlock(tp); 1861done2: dev_relthread(dev); 1862done1: fdrop(fp, curthread); 1863 return (error); 1864} 1865 1866void 1867ttyhook_unregister(struct tty *tp) 1868{ 1869 1870 tty_lock_assert(tp, MA_OWNED); 1871 MPASS(tp->t_flags & TF_HOOK); 1872 1873 /* Disconnect the hook. */ 1874 tp->t_flags &= ~TF_HOOK; 1875 tp->t_hook = NULL; 1876 1877 /* Maybe we need to leave bypass mode. */ 1878 ttydisc_optimize(tp); 1879 1880 /* Maybe deallocate the TTY as well. */ 1881 tty_rel_free(tp); 1882} 1883 1884/* 1885 * /dev/console handling. 1886 */ 1887 1888static int 1889ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 1890{ 1891 struct tty *tp; 1892 1893 /* System has no console device. */ 1894 if (dev_console_filename == NULL) 1895 return (ENXIO); 1896 1897 /* Look up corresponding TTY by device name. */ 1898 sx_slock(&tty_list_sx); 1899 TAILQ_FOREACH(tp, &tty_list, t_list) { 1900 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) { 1901 dev_console->si_drv1 = tp; 1902 break; 1903 } 1904 } 1905 sx_sunlock(&tty_list_sx); 1906 1907 /* System console has no TTY associated. */ 1908 if (dev_console->si_drv1 == NULL) 1909 return (ENXIO); 1910 1911 return (ttydev_open(dev, oflags, devtype, td)); 1912} 1913 1914static int 1915ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag) 1916{ 1917 1918 log_console(uio); 1919 1920 return (ttydev_write(dev, uio, ioflag)); 1921} 1922 1923/* 1924 * /dev/console is a little different than normal TTY's. When opened, 1925 * it determines which TTY to use. When data gets written to it, it 1926 * will be logged in the kernel message buffer. 1927 */ 1928static struct cdevsw ttyconsdev_cdevsw = { 1929 .d_version = D_VERSION, 1930 .d_open = ttyconsdev_open, 1931 .d_close = ttydev_close, 1932 .d_read = ttydev_read, 1933 .d_write = ttyconsdev_write, 1934 .d_ioctl = ttydev_ioctl, 1935 .d_kqfilter = ttydev_kqfilter, 1936 .d_poll = ttydev_poll, 1937 .d_mmap = ttydev_mmap, 1938 .d_name = "ttyconsdev", 1939 .d_flags = D_TTY, 1940}; 1941 1942static void 1943ttyconsdev_init(void *unused) 1944{ 1945 1946 dev_console = make_dev(&ttyconsdev_cdevsw, 0, UID_ROOT, GID_WHEEL, 1947 0600, "console"); 1948} 1949 1950SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL); 1951 1952void 1953ttyconsdev_select(const char *name) 1954{ 1955 1956 dev_console_filename = name; 1957} 1958 1959/* 1960 * Debugging routines. 1961 */ 1962 1963#include "opt_ddb.h" 1964#ifdef DDB 1965#include <ddb/ddb.h> 1966#include <ddb/db_sym.h> 1967 1968static struct { 1969 int flag; 1970 char val; 1971} ttystates[] = { 1972#if 0 1973 { TF_NOPREFIX, 'N' }, 1974#endif 1975 { TF_INITLOCK, 'I' }, 1976 { TF_CALLOUT, 'C' }, 1977 1978 /* Keep these together -> 'Oi' and 'Oo'. */ 1979 { TF_OPENED, 'O' }, 1980 { TF_OPENED_IN, 'i' }, 1981 { TF_OPENED_OUT, 'o' }, 1982 { TF_OPENED_CONS, 'c' }, 1983 1984 { TF_GONE, 'G' }, 1985 { TF_OPENCLOSE, 'B' }, 1986 { TF_ASYNC, 'Y' }, 1987 { TF_LITERAL, 'L' }, 1988 1989 /* Keep these together -> 'Hi' and 'Ho'. */ 1990 { TF_HIWAT, 'H' }, 1991 { TF_HIWAT_IN, 'i' }, 1992 { TF_HIWAT_OUT, 'o' }, 1993 1994 { TF_STOPPED, 'S' }, 1995 { TF_EXCLUDE, 'X' }, 1996 { TF_BYPASS, 'l' }, 1997 { TF_ZOMBIE, 'Z' }, 1998 { TF_HOOK, 's' }, 1999 2000 /* Keep these together -> 'bi' and 'bo'. */ 2001 { TF_BUSY, 'b' }, 2002 { TF_BUSY_IN, 'i' }, 2003 { TF_BUSY_OUT, 'o' }, 2004 2005 { 0, '\0'}, 2006}; 2007 2008#define TTY_FLAG_BITS \ 2009 "\20\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \ 2010 "\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \ 2011 "\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK" 2012 2013#define DB_PRINTSYM(name, addr) \ 2014 db_printf("%s " #name ": ", sep); \ 2015 db_printsym((db_addr_t) addr, DB_STGY_ANY); \ 2016 db_printf("\n"); 2017 2018static void 2019_db_show_devsw(const char *sep, const struct ttydevsw *tsw) 2020{ 2021 db_printf("%sdevsw: ", sep); 2022 db_printsym((db_addr_t)tsw, DB_STGY_ANY); 2023 db_printf(" (%p)\n", tsw); 2024 DB_PRINTSYM(open, tsw->tsw_open); 2025 DB_PRINTSYM(close, tsw->tsw_close); 2026 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup); 2027 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup); 2028 DB_PRINTSYM(ioctl, tsw->tsw_ioctl); 2029 DB_PRINTSYM(param, tsw->tsw_param); 2030 DB_PRINTSYM(modem, tsw->tsw_modem); 2031 DB_PRINTSYM(mmap, tsw->tsw_mmap); 2032 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify); 2033 DB_PRINTSYM(free, tsw->tsw_free); 2034} 2035static void 2036_db_show_hooks(const char *sep, const struct ttyhook *th) 2037{ 2038 db_printf("%shook: ", sep); 2039 db_printsym((db_addr_t)th, DB_STGY_ANY); 2040 db_printf(" (%p)\n", th); 2041 if (th == NULL) 2042 return; 2043 DB_PRINTSYM(rint, th->th_rint); 2044 DB_PRINTSYM(rint_bypass, th->th_rint_bypass); 2045 DB_PRINTSYM(rint_done, th->th_rint_done); 2046 DB_PRINTSYM(rint_poll, th->th_rint_poll); 2047 DB_PRINTSYM(getc_inject, th->th_getc_inject); 2048 DB_PRINTSYM(getc_capture, th->th_getc_capture); 2049 DB_PRINTSYM(getc_poll, th->th_getc_poll); 2050 DB_PRINTSYM(close, th->th_close); 2051} 2052 2053static void 2054_db_show_termios(const char *name, const struct termios *t) 2055{ 2056 2057 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x " 2058 "lflag 0x%x ispeed %u ospeed %u\n", name, 2059 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag, 2060 t->c_ispeed, t->c_ospeed); 2061} 2062 2063/* DDB command to show TTY statistics. */ 2064DB_SHOW_COMMAND(tty, db_show_tty) 2065{ 2066 struct tty *tp; 2067 2068 if (!have_addr) { 2069 db_printf("usage: show tty <addr>\n"); 2070 return; 2071 } 2072 tp = (struct tty *)addr; 2073 2074 db_printf("0x%p: %s\n", tp, tty_devname(tp)); 2075 db_printf("\tmtx: %p\n", tp->t_mtx); 2076 db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS); 2077 db_printf("\trevokecnt: %u\n", tp->t_revokecnt); 2078 2079 /* Buffering mechanisms. */ 2080 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u " 2081 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin, 2082 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end, 2083 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota); 2084 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n", 2085 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end, 2086 tp->t_outq.to_nblocks, tp->t_outq.to_quota); 2087 db_printf("\tinlow: %zu\n", tp->t_inlow); 2088 db_printf("\toutlow: %zu\n", tp->t_outlow); 2089 _db_show_termios("\ttermios", &tp->t_termios); 2090 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n", 2091 tp->t_winsize.ws_row, tp->t_winsize.ws_col, 2092 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel); 2093 db_printf("\tcolumn: %u\n", tp->t_column); 2094 db_printf("\twritepos: %u\n", tp->t_writepos); 2095 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags); 2096 2097 /* Init/lock-state devices. */ 2098 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in); 2099 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out); 2100 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in); 2101 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out); 2102 2103 /* Hooks */ 2104 _db_show_devsw("\t", tp->t_devsw); 2105 _db_show_hooks("\t", tp->t_hook); 2106 2107 /* Process info. */ 2108 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp, 2109 tp->t_pgrp ? tp->t_pgrp->pg_id : 0, 2110 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0); 2111 db_printf("\tsession: %p", tp->t_session); 2112 if (tp->t_session != NULL) 2113 db_printf(" count %u leader %p tty %p sid %d login %s", 2114 tp->t_session->s_count, tp->t_session->s_leader, 2115 tp->t_session->s_ttyp, tp->t_session->s_sid, 2116 tp->t_session->s_login); 2117 db_printf("\n"); 2118 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt); 2119 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc); 2120 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc); 2121 db_printf("\tdev: %p\n", tp->t_dev); 2122} 2123 2124/* DDB command to list TTYs. */ 2125DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys) 2126{ 2127 struct tty *tp; 2128 size_t isiz, osiz; 2129 int i, j; 2130 2131 /* Make the output look like `pstat -t'. */ 2132 db_printf("PTR "); 2133#if defined(__LP64__) 2134 db_printf(" "); 2135#endif 2136 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW " 2137 "COL SESS PGID STATE\n"); 2138 2139 TAILQ_FOREACH(tp, &tty_list, t_list) { 2140 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE; 2141 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE; 2142 2143 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ", 2144 tp, 2145 tty_devname(tp), 2146 isiz, 2147 tp->t_inq.ti_linestart - tp->t_inq.ti_begin, 2148 tp->t_inq.ti_end - tp->t_inq.ti_linestart, 2149 isiz - tp->t_inlow, 2150 osiz, 2151 tp->t_outq.to_end - tp->t_outq.to_begin, 2152 osiz - tp->t_outlow, 2153 MIN(tp->t_column, 99999), 2154 tp->t_session ? tp->t_session->s_sid : 0, 2155 tp->t_pgrp ? tp->t_pgrp->pg_id : 0); 2156 2157 /* Flag bits. */ 2158 for (i = j = 0; ttystates[i].flag; i++) 2159 if (tp->t_flags & ttystates[i].flag) { 2160 db_printf("%c", ttystates[i].val); 2161 j++; 2162 } 2163 if (j == 0) 2164 db_printf("-"); 2165 db_printf("\n"); 2166 } 2167} 2168#endif /* DDB */ 2169