tty.c revision 225506
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 225506 2011-09-12 10:07:21Z ed $"); 32 33#include "opt_capsicum.h" 34#include "opt_compat.h" 35 36#include <sys/param.h> 37#include <sys/capability.h> 38#include <sys/conf.h> 39#include <sys/cons.h> 40#include <sys/fcntl.h> 41#include <sys/file.h> 42#include <sys/filedesc.h> 43#include <sys/filio.h> 44#ifdef COMPAT_43TTY 45#include <sys/ioctl_compat.h> 46#endif /* COMPAT_43TTY */ 47#include <sys/kernel.h> 48#include <sys/limits.h> 49#include <sys/malloc.h> 50#include <sys/mount.h> 51#include <sys/poll.h> 52#include <sys/priv.h> 53#include <sys/proc.h> 54#include <sys/serial.h> 55#include <sys/signal.h> 56#include <sys/stat.h> 57#include <sys/sx.h> 58#include <sys/sysctl.h> 59#include <sys/systm.h> 60#include <sys/tty.h> 61#include <sys/ttycom.h> 62#define TTYDEFCHARS 63#include <sys/ttydefaults.h> 64#undef TTYDEFCHARS 65#include <sys/ucred.h> 66#include <sys/vnode.h> 67 68#include <machine/stdarg.h> 69 70static MALLOC_DEFINE(M_TTY, "tty", "tty device"); 71 72static void tty_rel_free(struct tty *tp); 73 74static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list); 75static struct sx tty_list_sx; 76SX_SYSINIT(tty_list, &tty_list_sx, "tty list"); 77static unsigned int tty_list_count = 0; 78 79/* Character device of /dev/console. */ 80static struct cdev *dev_console; 81static const char *dev_console_filename; 82 83/* 84 * Flags that are supported and stored by this implementation. 85 */ 86#define TTYSUP_IFLAG (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK|ISTRIP|\ 87 INLCR|IGNCR|ICRNL|IXON|IXOFF|IXANY|IMAXBEL) 88#define TTYSUP_OFLAG (OPOST|ONLCR|TAB3|ONOEOT|OCRNL|ONOCR|ONLRET) 89#define TTYSUP_LFLAG (ECHOKE|ECHOE|ECHOK|ECHO|ECHONL|ECHOPRT|\ 90 ECHOCTL|ISIG|ICANON|ALTWERASE|IEXTEN|TOSTOP|\ 91 FLUSHO|NOKERNINFO|NOFLSH) 92#define TTYSUP_CFLAG (CIGNORE|CSIZE|CSTOPB|CREAD|PARENB|PARODD|\ 93 HUPCL|CLOCAL|CCTS_OFLOW|CRTS_IFLOW|CDTR_IFLOW|\ 94 CDSR_OFLOW|CCAR_OFLOW) 95 96#define TTY_CALLOUT(tp,d) (dev2unit(d) & TTYUNIT_CALLOUT) 97 98/* 99 * Set TTY buffer sizes. 100 */ 101 102#define TTYBUF_MAX 65536 103 104static void 105tty_watermarks(struct tty *tp) 106{ 107 size_t bs = 0; 108 109 /* Provide an input buffer for 0.2 seconds of data. */ 110 if (tp->t_termios.c_cflag & CREAD) 111 bs = MIN(tp->t_termios.c_ispeed / 5, TTYBUF_MAX); 112 ttyinq_setsize(&tp->t_inq, tp, bs); 113 114 /* Set low watermark at 10% (when 90% is available). */ 115 tp->t_inlow = (ttyinq_getallocatedsize(&tp->t_inq) * 9) / 10; 116 117 /* Provide an ouput buffer for 0.2 seconds of data. */ 118 bs = MIN(tp->t_termios.c_ospeed / 5, TTYBUF_MAX); 119 ttyoutq_setsize(&tp->t_outq, tp, bs); 120 121 /* Set low watermark at 10% (when 90% is available). */ 122 tp->t_outlow = (ttyoutq_getallocatedsize(&tp->t_outq) * 9) / 10; 123} 124 125static int 126tty_drain(struct tty *tp) 127{ 128 int error; 129 130 if (ttyhook_hashook(tp, getc_inject)) 131 /* buffer is inaccessible */ 132 return (0); 133 134 while (ttyoutq_bytesused(&tp->t_outq) > 0) { 135 ttydevsw_outwakeup(tp); 136 /* Could be handled synchronously. */ 137 if (ttyoutq_bytesused(&tp->t_outq) == 0) 138 return (0); 139 140 /* Wait for data to be drained. */ 141 error = tty_wait(tp, &tp->t_outwait); 142 if (error) 143 return (error); 144 } 145 146 return (0); 147} 148 149/* 150 * Though ttydev_enter() and ttydev_leave() seem to be related, they 151 * don't have to be used together. ttydev_enter() is used by the cdev 152 * operations to prevent an actual operation from being processed when 153 * the TTY has been abandoned. ttydev_leave() is used by ttydev_open() 154 * and ttydev_close() to determine whether per-TTY data should be 155 * deallocated. 156 */ 157 158static __inline int 159ttydev_enter(struct tty *tp) 160{ 161 tty_lock(tp); 162 163 if (tty_gone(tp) || !tty_opened(tp)) { 164 /* Device is already gone. */ 165 tty_unlock(tp); 166 return (ENXIO); 167 } 168 169 return (0); 170} 171 172static void 173ttydev_leave(struct tty *tp) 174{ 175 tty_lock_assert(tp, MA_OWNED); 176 177 if (tty_opened(tp) || tp->t_flags & TF_OPENCLOSE) { 178 /* Device is still opened somewhere. */ 179 tty_unlock(tp); 180 return; 181 } 182 183 tp->t_flags |= TF_OPENCLOSE; 184 185 /* Stop asynchronous I/O. */ 186 funsetown(&tp->t_sigio); 187 188 /* Remove console TTY. */ 189 if (constty == tp) 190 constty_clear(); 191 192 /* Drain any output. */ 193 MPASS((tp->t_flags & TF_STOPPED) == 0); 194 if (!tty_gone(tp)) 195 tty_drain(tp); 196 197 ttydisc_close(tp); 198 199 /* Destroy associated buffers already. */ 200 ttyinq_free(&tp->t_inq); 201 tp->t_inlow = 0; 202 ttyoutq_free(&tp->t_outq); 203 tp->t_outlow = 0; 204 205 knlist_clear(&tp->t_inpoll.si_note, 1); 206 knlist_clear(&tp->t_outpoll.si_note, 1); 207 208 if (!tty_gone(tp)) 209 ttydevsw_close(tp); 210 211 tp->t_flags &= ~TF_OPENCLOSE; 212 cv_broadcast(&tp->t_dcdwait); 213 tty_rel_free(tp); 214} 215 216/* 217 * Operations that are exposed through the character device in /dev. 218 */ 219static int 220ttydev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 221{ 222 struct tty *tp = dev->si_drv1; 223 int error = 0; 224 225 tty_lock(tp); 226 if (tty_gone(tp)) { 227 /* Device is already gone. */ 228 tty_unlock(tp); 229 return (ENXIO); 230 } 231 232 /* 233 * Block when other processes are currently opening or closing 234 * the TTY. 235 */ 236 while (tp->t_flags & TF_OPENCLOSE) { 237 error = tty_wait(tp, &tp->t_dcdwait); 238 if (error != 0) { 239 tty_unlock(tp); 240 return (error); 241 } 242 } 243 tp->t_flags |= TF_OPENCLOSE; 244 245 /* 246 * Make sure the "tty" and "cua" device cannot be opened at the 247 * same time. 248 */ 249 if (TTY_CALLOUT(tp, dev)) { 250 if (tp->t_flags & TF_OPENED_IN) { 251 error = EBUSY; 252 goto done; 253 } 254 } else { 255 if (tp->t_flags & TF_OPENED_OUT) { 256 error = EBUSY; 257 goto done; 258 } 259 } 260 261 if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) { 262 error = EBUSY; 263 goto done; 264 } 265 266 if (!tty_opened(tp)) { 267 /* Set proper termios flags. */ 268 if (TTY_CALLOUT(tp, dev)) 269 tp->t_termios = tp->t_termios_init_out; 270 else 271 tp->t_termios = tp->t_termios_init_in; 272 ttydevsw_param(tp, &tp->t_termios); 273 /* Prevent modem control on callout devices and /dev/console. */ 274 if (TTY_CALLOUT(tp, dev) || dev == dev_console) 275 tp->t_termios.c_cflag |= CLOCAL; 276 277 ttydevsw_modem(tp, SER_DTR|SER_RTS, 0); 278 279 error = ttydevsw_open(tp); 280 if (error != 0) 281 goto done; 282 283 ttydisc_open(tp); 284 tty_watermarks(tp); 285 } 286 287 /* Wait for Carrier Detect. */ 288 if ((oflags & O_NONBLOCK) == 0 && 289 (tp->t_termios.c_cflag & CLOCAL) == 0) { 290 while ((ttydevsw_modem(tp, 0, 0) & SER_DCD) == 0) { 291 error = tty_wait(tp, &tp->t_dcdwait); 292 if (error != 0) 293 goto done; 294 } 295 } 296 297 if (dev == dev_console) 298 tp->t_flags |= TF_OPENED_CONS; 299 else if (TTY_CALLOUT(tp, dev)) 300 tp->t_flags |= TF_OPENED_OUT; 301 else 302 tp->t_flags |= TF_OPENED_IN; 303 304done: tp->t_flags &= ~TF_OPENCLOSE; 305 cv_broadcast(&tp->t_dcdwait); 306 ttydev_leave(tp); 307 308 return (error); 309} 310 311static int 312ttydev_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 313{ 314 struct tty *tp = dev->si_drv1; 315 316 tty_lock(tp); 317 318 /* 319 * Don't actually close the device if it is being used as the 320 * console. 321 */ 322 MPASS((tp->t_flags & TF_OPENED) != TF_OPENED); 323 if (dev == dev_console) 324 tp->t_flags &= ~TF_OPENED_CONS; 325 else 326 tp->t_flags &= ~(TF_OPENED_IN|TF_OPENED_OUT); 327 328 if (tp->t_flags & TF_OPENED) { 329 tty_unlock(tp); 330 return (0); 331 } 332 333 /* 334 * This can only be called once. The callin and the callout 335 * devices cannot be opened at the same time. 336 */ 337 tp->t_flags &= ~(TF_EXCLUDE|TF_STOPPED); 338 339 /* Properly wake up threads that are stuck - revoke(). */ 340 tp->t_revokecnt++; 341 tty_wakeup(tp, FREAD|FWRITE); 342 cv_broadcast(&tp->t_bgwait); 343 cv_broadcast(&tp->t_dcdwait); 344 345 ttydev_leave(tp); 346 347 return (0); 348} 349 350static __inline int 351tty_is_ctty(struct tty *tp, struct proc *p) 352{ 353 tty_lock_assert(tp, MA_OWNED); 354 355 return (p->p_session == tp->t_session && p->p_flag & P_CONTROLT); 356} 357 358static int 359tty_wait_background(struct tty *tp, struct thread *td, int sig) 360{ 361 struct proc *p = td->td_proc; 362 struct pgrp *pg; 363 ksiginfo_t ksi; 364 int error; 365 366 MPASS(sig == SIGTTIN || sig == SIGTTOU); 367 tty_lock_assert(tp, MA_OWNED); 368 369 for (;;) { 370 PROC_LOCK(p); 371 /* 372 * The process should only sleep, when: 373 * - This terminal is the controling terminal 374 * - Its process group is not the foreground process 375 * group 376 * - The parent process isn't waiting for the child to 377 * exit 378 * - the signal to send to the process isn't masked 379 */ 380 if (!tty_is_ctty(tp, p) || p->p_pgrp == tp->t_pgrp) { 381 /* Allow the action to happen. */ 382 PROC_UNLOCK(p); 383 return (0); 384 } 385 386 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, sig) || 387 SIGISMEMBER(td->td_sigmask, sig)) { 388 /* Only allow them in write()/ioctl(). */ 389 PROC_UNLOCK(p); 390 return (sig == SIGTTOU ? 0 : EIO); 391 } 392 393 pg = p->p_pgrp; 394 if (p->p_flag & P_PPWAIT || pg->pg_jobc == 0) { 395 /* Don't allow the action to happen. */ 396 PROC_UNLOCK(p); 397 return (EIO); 398 } 399 PROC_UNLOCK(p); 400 401 /* 402 * Send the signal and sleep until we're the new 403 * foreground process group. 404 */ 405 if (sig != 0) { 406 ksiginfo_init(&ksi); 407 ksi.ksi_code = SI_KERNEL; 408 ksi.ksi_signo = sig; 409 sig = 0; 410 } 411 PGRP_LOCK(pg); 412 pgsignal(pg, ksi.ksi_signo, 1, &ksi); 413 PGRP_UNLOCK(pg); 414 415 error = tty_wait(tp, &tp->t_bgwait); 416 if (error) 417 return (error); 418 } 419} 420 421static int 422ttydev_read(struct cdev *dev, struct uio *uio, int ioflag) 423{ 424 struct tty *tp = dev->si_drv1; 425 int error; 426 427 error = ttydev_enter(tp); 428 if (error) 429 goto done; 430 431 error = tty_wait_background(tp, curthread, SIGTTIN); 432 if (error) { 433 tty_unlock(tp); 434 goto done; 435 } 436 437 error = ttydisc_read(tp, uio, ioflag); 438 tty_unlock(tp); 439 440 /* 441 * The read() call should not throw an error when the device is 442 * being destroyed. Silently convert it to an EOF. 443 */ 444done: if (error == ENXIO) 445 error = 0; 446 return (error); 447} 448 449static int 450ttydev_write(struct cdev *dev, struct uio *uio, int ioflag) 451{ 452 struct tty *tp = dev->si_drv1; 453 int error; 454 455 error = ttydev_enter(tp); 456 if (error) 457 return (error); 458 459 if (tp->t_termios.c_lflag & TOSTOP) { 460 error = tty_wait_background(tp, curthread, SIGTTOU); 461 if (error) 462 goto done; 463 } 464 465 if (ioflag & IO_NDELAY && tp->t_flags & TF_BUSY_OUT) { 466 /* Allow non-blocking writes to bypass serialization. */ 467 error = ttydisc_write(tp, uio, ioflag); 468 } else { 469 /* Serialize write() calls. */ 470 while (tp->t_flags & TF_BUSY_OUT) { 471 error = tty_wait(tp, &tp->t_outserwait); 472 if (error) 473 goto done; 474 } 475 476 tp->t_flags |= TF_BUSY_OUT; 477 error = ttydisc_write(tp, uio, ioflag); 478 tp->t_flags &= ~TF_BUSY_OUT; 479 cv_signal(&tp->t_outserwait); 480 } 481 482done: tty_unlock(tp); 483 return (error); 484} 485 486static int 487ttydev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 488 struct thread *td) 489{ 490 struct tty *tp = dev->si_drv1; 491 int error; 492 493 error = ttydev_enter(tp); 494 if (error) 495 return (error); 496 497 switch (cmd) { 498 case TIOCCBRK: 499 case TIOCCONS: 500 case TIOCDRAIN: 501 case TIOCEXCL: 502 case TIOCFLUSH: 503 case TIOCNXCL: 504 case TIOCSBRK: 505 case TIOCSCTTY: 506 case TIOCSETA: 507 case TIOCSETAF: 508 case TIOCSETAW: 509 case TIOCSPGRP: 510 case TIOCSTART: 511 case TIOCSTAT: 512 case TIOCSTI: 513 case TIOCSTOP: 514 case TIOCSWINSZ: 515#if 0 516 case TIOCSDRAINWAIT: 517 case TIOCSETD: 518#endif 519#ifdef COMPAT_43TTY 520 case TIOCLBIC: 521 case TIOCLBIS: 522 case TIOCLSET: 523 case TIOCSETC: 524 case OTIOCSETD: 525 case TIOCSETN: 526 case TIOCSETP: 527 case TIOCSLTC: 528#endif /* COMPAT_43TTY */ 529 /* 530 * If the ioctl() causes the TTY to be modified, let it 531 * wait in the background. 532 */ 533 error = tty_wait_background(tp, curthread, SIGTTOU); 534 if (error) 535 goto done; 536 } 537 538 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 539 struct termios *old = &tp->t_termios; 540 struct termios *new = (struct termios *)data; 541 struct termios *lock = TTY_CALLOUT(tp, dev) ? 542 &tp->t_termios_lock_out : &tp->t_termios_lock_in; 543 int cc; 544 545 /* 546 * Lock state devices. Just overwrite the values of the 547 * commands that are currently in use. 548 */ 549 new->c_iflag = (old->c_iflag & lock->c_iflag) | 550 (new->c_iflag & ~lock->c_iflag); 551 new->c_oflag = (old->c_oflag & lock->c_oflag) | 552 (new->c_oflag & ~lock->c_oflag); 553 new->c_cflag = (old->c_cflag & lock->c_cflag) | 554 (new->c_cflag & ~lock->c_cflag); 555 new->c_lflag = (old->c_lflag & lock->c_lflag) | 556 (new->c_lflag & ~lock->c_lflag); 557 for (cc = 0; cc < NCCS; ++cc) 558 if (lock->c_cc[cc]) 559 new->c_cc[cc] = old->c_cc[cc]; 560 if (lock->c_ispeed) 561 new->c_ispeed = old->c_ispeed; 562 if (lock->c_ospeed) 563 new->c_ospeed = old->c_ospeed; 564 } 565 566 error = tty_ioctl(tp, cmd, data, fflag, td); 567done: tty_unlock(tp); 568 569 return (error); 570} 571 572static int 573ttydev_poll(struct cdev *dev, int events, struct thread *td) 574{ 575 struct tty *tp = dev->si_drv1; 576 int error, revents = 0; 577 578 error = ttydev_enter(tp); 579 if (error) 580 return ((events & (POLLIN|POLLRDNORM)) | POLLHUP); 581 582 if (events & (POLLIN|POLLRDNORM)) { 583 /* See if we can read something. */ 584 if (ttydisc_read_poll(tp) > 0) 585 revents |= events & (POLLIN|POLLRDNORM); 586 } 587 588 if (tp->t_flags & TF_ZOMBIE) { 589 /* Hangup flag on zombie state. */ 590 revents |= POLLHUP; 591 } else if (events & (POLLOUT|POLLWRNORM)) { 592 /* See if we can write something. */ 593 if (ttydisc_write_poll(tp) > 0) 594 revents |= events & (POLLOUT|POLLWRNORM); 595 } 596 597 if (revents == 0) { 598 if (events & (POLLIN|POLLRDNORM)) 599 selrecord(td, &tp->t_inpoll); 600 if (events & (POLLOUT|POLLWRNORM)) 601 selrecord(td, &tp->t_outpoll); 602 } 603 604 tty_unlock(tp); 605 606 return (revents); 607} 608 609static int 610ttydev_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 611 int nprot, vm_memattr_t *memattr) 612{ 613 struct tty *tp = dev->si_drv1; 614 int error; 615 616 /* Handle mmap() through the driver. */ 617 618 error = ttydev_enter(tp); 619 if (error) 620 return (-1); 621 error = ttydevsw_mmap(tp, offset, paddr, nprot, memattr); 622 tty_unlock(tp); 623 624 return (error); 625} 626 627/* 628 * kqueue support. 629 */ 630 631static void 632tty_kqops_read_detach(struct knote *kn) 633{ 634 struct tty *tp = kn->kn_hook; 635 636 knlist_remove(&tp->t_inpoll.si_note, kn, 0); 637} 638 639static int 640tty_kqops_read_event(struct knote *kn, long hint) 641{ 642 struct tty *tp = kn->kn_hook; 643 644 tty_lock_assert(tp, MA_OWNED); 645 646 if (tty_gone(tp) || tp->t_flags & TF_ZOMBIE) { 647 kn->kn_flags |= EV_EOF; 648 return (1); 649 } else { 650 kn->kn_data = ttydisc_read_poll(tp); 651 return (kn->kn_data > 0); 652 } 653} 654 655static void 656tty_kqops_write_detach(struct knote *kn) 657{ 658 struct tty *tp = kn->kn_hook; 659 660 knlist_remove(&tp->t_outpoll.si_note, kn, 0); 661} 662 663static int 664tty_kqops_write_event(struct knote *kn, long hint) 665{ 666 struct tty *tp = kn->kn_hook; 667 668 tty_lock_assert(tp, MA_OWNED); 669 670 if (tty_gone(tp)) { 671 kn->kn_flags |= EV_EOF; 672 return (1); 673 } else { 674 kn->kn_data = ttydisc_write_poll(tp); 675 return (kn->kn_data > 0); 676 } 677} 678 679static struct filterops tty_kqops_read = { 680 .f_isfd = 1, 681 .f_detach = tty_kqops_read_detach, 682 .f_event = tty_kqops_read_event, 683}; 684static struct filterops tty_kqops_write = { 685 .f_isfd = 1, 686 .f_detach = tty_kqops_write_detach, 687 .f_event = tty_kqops_write_event, 688}; 689 690static int 691ttydev_kqfilter(struct cdev *dev, struct knote *kn) 692{ 693 struct tty *tp = dev->si_drv1; 694 int error; 695 696 error = ttydev_enter(tp); 697 if (error) 698 return (error); 699 700 switch (kn->kn_filter) { 701 case EVFILT_READ: 702 kn->kn_hook = tp; 703 kn->kn_fop = &tty_kqops_read; 704 knlist_add(&tp->t_inpoll.si_note, kn, 1); 705 break; 706 case EVFILT_WRITE: 707 kn->kn_hook = tp; 708 kn->kn_fop = &tty_kqops_write; 709 knlist_add(&tp->t_outpoll.si_note, kn, 1); 710 break; 711 default: 712 error = EINVAL; 713 break; 714 } 715 716 tty_unlock(tp); 717 return (error); 718} 719 720static struct cdevsw ttydev_cdevsw = { 721 .d_version = D_VERSION, 722 .d_open = ttydev_open, 723 .d_close = ttydev_close, 724 .d_read = ttydev_read, 725 .d_write = ttydev_write, 726 .d_ioctl = ttydev_ioctl, 727 .d_kqfilter = ttydev_kqfilter, 728 .d_poll = ttydev_poll, 729 .d_mmap = ttydev_mmap, 730 .d_name = "ttydev", 731 .d_flags = D_TTY, 732}; 733 734/* 735 * Init/lock-state devices 736 */ 737 738static int 739ttyil_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 740{ 741 struct tty *tp = dev->si_drv1; 742 int error = 0; 743 744 tty_lock(tp); 745 if (tty_gone(tp)) 746 error = ENODEV; 747 tty_unlock(tp); 748 749 return (error); 750} 751 752static int 753ttyil_close(struct cdev *dev, int flag, int mode, struct thread *td) 754{ 755 return (0); 756} 757 758static int 759ttyil_rdwr(struct cdev *dev, struct uio *uio, int ioflag) 760{ 761 return (ENODEV); 762} 763 764static int 765ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 766 struct thread *td) 767{ 768 struct tty *tp = dev->si_drv1; 769 int error; 770 771 tty_lock(tp); 772 if (tty_gone(tp)) { 773 error = ENODEV; 774 goto done; 775 } 776 777 error = ttydevsw_cioctl(tp, dev2unit(dev), cmd, data, td); 778 if (error != ENOIOCTL) 779 goto done; 780 error = 0; 781 782 switch (cmd) { 783 case TIOCGETA: 784 /* Obtain terminal flags through tcgetattr(). */ 785 *(struct termios*)data = *(struct termios*)dev->si_drv2; 786 break; 787 case TIOCSETA: 788 /* Set terminal flags through tcsetattr(). */ 789 error = priv_check(td, PRIV_TTY_SETA); 790 if (error) 791 break; 792 *(struct termios*)dev->si_drv2 = *(struct termios*)data; 793 break; 794 case TIOCGETD: 795 *(int *)data = TTYDISC; 796 break; 797 case TIOCGWINSZ: 798 bzero(data, sizeof(struct winsize)); 799 break; 800 default: 801 error = ENOTTY; 802 } 803 804done: tty_unlock(tp); 805 return (error); 806} 807 808static struct cdevsw ttyil_cdevsw = { 809 .d_version = D_VERSION, 810 .d_open = ttyil_open, 811 .d_close = ttyil_close, 812 .d_read = ttyil_rdwr, 813 .d_write = ttyil_rdwr, 814 .d_ioctl = ttyil_ioctl, 815 .d_name = "ttyil", 816 .d_flags = D_TTY, 817}; 818 819static void 820tty_init_termios(struct tty *tp) 821{ 822 struct termios *t = &tp->t_termios_init_in; 823 824 t->c_cflag = TTYDEF_CFLAG; 825 t->c_iflag = TTYDEF_IFLAG; 826 t->c_lflag = TTYDEF_LFLAG; 827 t->c_oflag = TTYDEF_OFLAG; 828 t->c_ispeed = TTYDEF_SPEED; 829 t->c_ospeed = TTYDEF_SPEED; 830 memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars); 831 832 tp->t_termios_init_out = *t; 833} 834 835void 836tty_init_console(struct tty *tp, speed_t s) 837{ 838 struct termios *ti = &tp->t_termios_init_in; 839 struct termios *to = &tp->t_termios_init_out; 840 841 if (s != 0) { 842 ti->c_ispeed = ti->c_ospeed = s; 843 to->c_ispeed = to->c_ospeed = s; 844 } 845 846 ti->c_cflag |= CLOCAL; 847 to->c_cflag |= CLOCAL; 848} 849 850/* 851 * Standard device routine implementations, mostly meant for 852 * pseudo-terminal device drivers. When a driver creates a new terminal 853 * device class, missing routines are patched. 854 */ 855 856static int 857ttydevsw_defopen(struct tty *tp) 858{ 859 860 return (0); 861} 862 863static void 864ttydevsw_defclose(struct tty *tp) 865{ 866} 867 868static void 869ttydevsw_defoutwakeup(struct tty *tp) 870{ 871 872 panic("Terminal device has output, while not implemented"); 873} 874 875static void 876ttydevsw_definwakeup(struct tty *tp) 877{ 878} 879 880static int 881ttydevsw_defioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td) 882{ 883 884 return (ENOIOCTL); 885} 886 887static int 888ttydevsw_defcioctl(struct tty *tp, int unit, u_long cmd, caddr_t data, struct thread *td) 889{ 890 891 return (ENOIOCTL); 892} 893 894static int 895ttydevsw_defparam(struct tty *tp, struct termios *t) 896{ 897 898 /* 899 * Allow the baud rate to be adjusted for pseudo-devices, but at 900 * least restrict it to 115200 to prevent excessive buffer 901 * usage. Also disallow 0, to prevent foot shooting. 902 */ 903 if (t->c_ispeed < B50) 904 t->c_ispeed = B50; 905 else if (t->c_ispeed > B115200) 906 t->c_ispeed = B115200; 907 if (t->c_ospeed < B50) 908 t->c_ospeed = B50; 909 else if (t->c_ospeed > B115200) 910 t->c_ospeed = B115200; 911 t->c_cflag |= CREAD; 912 913 return (0); 914} 915 916static int 917ttydevsw_defmodem(struct tty *tp, int sigon, int sigoff) 918{ 919 920 /* Simulate a carrier to make the TTY layer happy. */ 921 return (SER_DCD); 922} 923 924static int 925ttydevsw_defmmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t *paddr, 926 int nprot, vm_memattr_t *memattr) 927{ 928 929 return (-1); 930} 931 932static void 933ttydevsw_defpktnotify(struct tty *tp, char event) 934{ 935} 936 937static void 938ttydevsw_deffree(void *softc) 939{ 940 941 panic("Terminal device freed without a free-handler"); 942} 943 944/* 945 * TTY allocation and deallocation. TTY devices can be deallocated when 946 * the driver doesn't use it anymore, when the TTY isn't a session's 947 * controlling TTY and when the device node isn't opened through devfs. 948 */ 949 950struct tty * 951tty_alloc(struct ttydevsw *tsw, void *sc) 952{ 953 954 return (tty_alloc_mutex(tsw, sc, NULL)); 955} 956 957struct tty * 958tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex) 959{ 960 struct tty *tp; 961 962 /* Make sure the driver defines all routines. */ 963#define PATCH_FUNC(x) do { \ 964 if (tsw->tsw_ ## x == NULL) \ 965 tsw->tsw_ ## x = ttydevsw_def ## x; \ 966} while (0) 967 PATCH_FUNC(open); 968 PATCH_FUNC(close); 969 PATCH_FUNC(outwakeup); 970 PATCH_FUNC(inwakeup); 971 PATCH_FUNC(ioctl); 972 PATCH_FUNC(cioctl); 973 PATCH_FUNC(param); 974 PATCH_FUNC(modem); 975 PATCH_FUNC(mmap); 976 PATCH_FUNC(pktnotify); 977 PATCH_FUNC(free); 978#undef PATCH_FUNC 979 980 tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO); 981 tp->t_devsw = tsw; 982 tp->t_devswsoftc = sc; 983 tp->t_flags = tsw->tsw_flags; 984 985 tty_init_termios(tp); 986 987 cv_init(&tp->t_inwait, "ttyin"); 988 cv_init(&tp->t_outwait, "ttyout"); 989 cv_init(&tp->t_outserwait, "ttyosr"); 990 cv_init(&tp->t_bgwait, "ttybg"); 991 cv_init(&tp->t_dcdwait, "ttydcd"); 992 993 /* Allow drivers to use a custom mutex to lock the TTY. */ 994 if (mutex != NULL) { 995 tp->t_mtx = mutex; 996 } else { 997 tp->t_mtx = &tp->t_mtxobj; 998 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF); 999 } 1000 1001 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx); 1002 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx); 1003 1004 sx_xlock(&tty_list_sx); 1005 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 1006 tty_list_count++; 1007 sx_xunlock(&tty_list_sx); 1008 1009 return (tp); 1010} 1011 1012static void 1013tty_dealloc(void *arg) 1014{ 1015 struct tty *tp = arg; 1016 1017 sx_xlock(&tty_list_sx); 1018 TAILQ_REMOVE(&tty_list, tp, t_list); 1019 tty_list_count--; 1020 sx_xunlock(&tty_list_sx); 1021 1022 /* Make sure we haven't leaked buffers. */ 1023 MPASS(ttyinq_getsize(&tp->t_inq) == 0); 1024 MPASS(ttyoutq_getsize(&tp->t_outq) == 0); 1025 1026 seldrain(&tp->t_inpoll); 1027 seldrain(&tp->t_outpoll); 1028 knlist_destroy(&tp->t_inpoll.si_note); 1029 knlist_destroy(&tp->t_outpoll.si_note); 1030 1031 cv_destroy(&tp->t_inwait); 1032 cv_destroy(&tp->t_outwait); 1033 cv_destroy(&tp->t_bgwait); 1034 cv_destroy(&tp->t_dcdwait); 1035 cv_destroy(&tp->t_outserwait); 1036 1037 if (tp->t_mtx == &tp->t_mtxobj) 1038 mtx_destroy(&tp->t_mtxobj); 1039 ttydevsw_free(tp); 1040 free(tp, M_TTY); 1041} 1042 1043static void 1044tty_rel_free(struct tty *tp) 1045{ 1046 struct cdev *dev; 1047 1048 tty_lock_assert(tp, MA_OWNED); 1049 1050#define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE) 1051 if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) { 1052 /* TTY is still in use. */ 1053 tty_unlock(tp); 1054 return; 1055 } 1056 1057 /* TTY can be deallocated. */ 1058 dev = tp->t_dev; 1059 tp->t_dev = NULL; 1060 tty_unlock(tp); 1061 1062 if (dev != NULL) 1063 destroy_dev_sched_cb(dev, tty_dealloc, tp); 1064} 1065 1066void 1067tty_rel_pgrp(struct tty *tp, struct pgrp *pg) 1068{ 1069 MPASS(tp->t_sessioncnt > 0); 1070 tty_lock_assert(tp, MA_OWNED); 1071 1072 if (tp->t_pgrp == pg) 1073 tp->t_pgrp = NULL; 1074 1075 tty_unlock(tp); 1076} 1077 1078void 1079tty_rel_sess(struct tty *tp, struct session *sess) 1080{ 1081 MPASS(tp->t_sessioncnt > 0); 1082 1083 /* Current session has left. */ 1084 if (tp->t_session == sess) { 1085 tp->t_session = NULL; 1086 MPASS(tp->t_pgrp == NULL); 1087 } 1088 tp->t_sessioncnt--; 1089 tty_rel_free(tp); 1090} 1091 1092void 1093tty_rel_gone(struct tty *tp) 1094{ 1095 MPASS(!tty_gone(tp)); 1096 1097 /* Simulate carrier removal. */ 1098 ttydisc_modem(tp, 0); 1099 1100 /* Wake up all blocked threads. */ 1101 tty_wakeup(tp, FREAD|FWRITE); 1102 cv_broadcast(&tp->t_bgwait); 1103 cv_broadcast(&tp->t_dcdwait); 1104 1105 tp->t_flags |= TF_GONE; 1106 tty_rel_free(tp); 1107} 1108 1109/* 1110 * Exposing information about current TTY's through sysctl 1111 */ 1112 1113static void 1114tty_to_xtty(struct tty *tp, struct xtty *xt) 1115{ 1116 tty_lock_assert(tp, MA_OWNED); 1117 1118 xt->xt_size = sizeof(struct xtty); 1119 xt->xt_insize = ttyinq_getsize(&tp->t_inq); 1120 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq); 1121 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq); 1122 xt->xt_inlow = tp->t_inlow; 1123 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq); 1124 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq); 1125 xt->xt_outlow = tp->t_outlow; 1126 xt->xt_column = tp->t_column; 1127 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1128 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0; 1129 xt->xt_flags = tp->t_flags; 1130 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV; 1131} 1132 1133static int 1134sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 1135{ 1136 unsigned long lsize; 1137 struct xtty *xtlist, *xt; 1138 struct tty *tp; 1139 int error; 1140 1141 sx_slock(&tty_list_sx); 1142 lsize = tty_list_count * sizeof(struct xtty); 1143 if (lsize == 0) { 1144 sx_sunlock(&tty_list_sx); 1145 return (0); 1146 } 1147 1148 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK); 1149 1150 TAILQ_FOREACH(tp, &tty_list, t_list) { 1151 tty_lock(tp); 1152 tty_to_xtty(tp, xt); 1153 tty_unlock(tp); 1154 xt++; 1155 } 1156 sx_sunlock(&tty_list_sx); 1157 1158 error = SYSCTL_OUT(req, xtlist, lsize); 1159 free(xtlist, M_TTY); 1160 return (error); 1161} 1162 1163SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 1164 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs"); 1165 1166/* 1167 * Device node creation. Device has been set up, now we can expose it to 1168 * the user. 1169 */ 1170 1171void 1172tty_makedev(struct tty *tp, struct ucred *cred, const char *fmt, ...) 1173{ 1174 va_list ap; 1175 struct cdev *dev; 1176 const char *prefix = "tty"; 1177 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */ 1178 uid_t uid; 1179 gid_t gid; 1180 mode_t mode; 1181 1182 /* Remove "tty" prefix from devices like PTY's. */ 1183 if (tp->t_flags & TF_NOPREFIX) 1184 prefix = ""; 1185 1186 va_start(ap, fmt); 1187 vsnrprintf(name, sizeof name, 32, fmt, ap); 1188 va_end(ap); 1189 1190 if (cred == NULL) { 1191 /* System device. */ 1192 uid = UID_ROOT; 1193 gid = GID_WHEEL; 1194 mode = S_IRUSR|S_IWUSR; 1195 } else { 1196 /* User device. */ 1197 uid = cred->cr_ruid; 1198 gid = GID_TTY; 1199 mode = S_IRUSR|S_IWUSR|S_IWGRP; 1200 } 1201 1202 /* Master call-in device. */ 1203 dev = make_dev_cred(&ttydev_cdevsw, 0, cred, 1204 uid, gid, mode, "%s%s", prefix, name); 1205 dev->si_drv1 = tp; 1206 tp->t_dev = dev; 1207 1208 /* Slave call-in devices. */ 1209 if (tp->t_flags & TF_INITLOCK) { 1210 dev = make_dev_cred(&ttyil_cdevsw, TTYUNIT_INIT, cred, 1211 uid, gid, mode, "%s%s.init", prefix, name); 1212 dev_depends(tp->t_dev, dev); 1213 dev->si_drv1 = tp; 1214 dev->si_drv2 = &tp->t_termios_init_in; 1215 1216 dev = make_dev_cred(&ttyil_cdevsw, TTYUNIT_LOCK, cred, 1217 uid, gid, mode, "%s%s.lock", prefix, name); 1218 dev_depends(tp->t_dev, dev); 1219 dev->si_drv1 = tp; 1220 dev->si_drv2 = &tp->t_termios_lock_in; 1221 } 1222 1223 /* Call-out devices. */ 1224 if (tp->t_flags & TF_CALLOUT) { 1225 dev = make_dev_cred(&ttydev_cdevsw, TTYUNIT_CALLOUT, cred, 1226 UID_UUCP, GID_DIALER, 0660, "cua%s", name); 1227 dev_depends(tp->t_dev, dev); 1228 dev->si_drv1 = tp; 1229 1230 /* Slave call-out devices. */ 1231 if (tp->t_flags & TF_INITLOCK) { 1232 dev = make_dev_cred(&ttyil_cdevsw, 1233 TTYUNIT_CALLOUT | TTYUNIT_INIT, cred, 1234 UID_UUCP, GID_DIALER, 0660, "cua%s.init", name); 1235 dev_depends(tp->t_dev, dev); 1236 dev->si_drv1 = tp; 1237 dev->si_drv2 = &tp->t_termios_init_out; 1238 1239 dev = make_dev_cred(&ttyil_cdevsw, 1240 TTYUNIT_CALLOUT | TTYUNIT_LOCK, cred, 1241 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", name); 1242 dev_depends(tp->t_dev, dev); 1243 dev->si_drv1 = tp; 1244 dev->si_drv2 = &tp->t_termios_lock_out; 1245 } 1246 } 1247} 1248 1249/* 1250 * Signalling processes. 1251 */ 1252 1253void 1254tty_signal_sessleader(struct tty *tp, int sig) 1255{ 1256 struct proc *p; 1257 1258 tty_lock_assert(tp, MA_OWNED); 1259 MPASS(sig >= 1 && sig < NSIG); 1260 1261 /* Make signals start output again. */ 1262 tp->t_flags &= ~TF_STOPPED; 1263 1264 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) { 1265 p = tp->t_session->s_leader; 1266 PROC_LOCK(p); 1267 psignal(p, sig); 1268 PROC_UNLOCK(p); 1269 } 1270} 1271 1272void 1273tty_signal_pgrp(struct tty *tp, int sig) 1274{ 1275 ksiginfo_t ksi; 1276 1277 tty_lock_assert(tp, MA_OWNED); 1278 MPASS(sig >= 1 && sig < NSIG); 1279 1280 /* Make signals start output again. */ 1281 tp->t_flags &= ~TF_STOPPED; 1282 1283 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO)) 1284 tty_info(tp); 1285 if (tp->t_pgrp != NULL) { 1286 ksiginfo_init(&ksi); 1287 ksi.ksi_signo = sig; 1288 ksi.ksi_code = SI_KERNEL; 1289 PGRP_LOCK(tp->t_pgrp); 1290 pgsignal(tp->t_pgrp, sig, 1, &ksi); 1291 PGRP_UNLOCK(tp->t_pgrp); 1292 } 1293} 1294 1295void 1296tty_wakeup(struct tty *tp, int flags) 1297{ 1298 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL) 1299 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 1300 1301 if (flags & FWRITE) { 1302 cv_broadcast(&tp->t_outwait); 1303 selwakeup(&tp->t_outpoll); 1304 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0); 1305 } 1306 if (flags & FREAD) { 1307 cv_broadcast(&tp->t_inwait); 1308 selwakeup(&tp->t_inpoll); 1309 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0); 1310 } 1311} 1312 1313int 1314tty_wait(struct tty *tp, struct cv *cv) 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_wait_sig(cv, tp->t_mtx); 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 1335int 1336tty_timedwait(struct tty *tp, struct cv *cv, int hz) 1337{ 1338 int error; 1339 int revokecnt = tp->t_revokecnt; 1340 1341 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1342 MPASS(!tty_gone(tp)); 1343 1344 error = cv_timedwait_sig(cv, tp->t_mtx, hz); 1345 1346 /* Restart the system call when we may have been revoked. */ 1347 if (tp->t_revokecnt != revokecnt) 1348 return (ERESTART); 1349 1350 /* Bail out when the device slipped away. */ 1351 if (tty_gone(tp)) 1352 return (ENXIO); 1353 1354 return (error); 1355} 1356 1357void 1358tty_flush(struct tty *tp, int flags) 1359{ 1360 if (flags & FWRITE) { 1361 tp->t_flags &= ~TF_HIWAT_OUT; 1362 ttyoutq_flush(&tp->t_outq); 1363 tty_wakeup(tp, FWRITE); 1364 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE); 1365 } 1366 if (flags & FREAD) { 1367 tty_hiwat_in_unblock(tp); 1368 ttyinq_flush(&tp->t_inq); 1369 ttydevsw_inwakeup(tp); 1370 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD); 1371 } 1372} 1373 1374static int 1375tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, 1376 struct thread *td) 1377{ 1378 int error; 1379 1380 switch (cmd) { 1381 /* 1382 * Modem commands. 1383 * The SER_* and TIOCM_* flags are the same, but one bit 1384 * shifted. I don't know why. 1385 */ 1386 case TIOCSDTR: 1387 ttydevsw_modem(tp, SER_DTR, 0); 1388 return (0); 1389 case TIOCCDTR: 1390 ttydevsw_modem(tp, 0, SER_DTR); 1391 return (0); 1392 case TIOCMSET: { 1393 int bits = *(int *)data; 1394 ttydevsw_modem(tp, 1395 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 1396 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1397 return (0); 1398 } 1399 case TIOCMBIS: { 1400 int bits = *(int *)data; 1401 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0); 1402 return (0); 1403 } 1404 case TIOCMBIC: { 1405 int bits = *(int *)data; 1406 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1407 return (0); 1408 } 1409 case TIOCMGET: 1410 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1); 1411 return (0); 1412 1413 case FIOASYNC: 1414 if (*(int *)data) 1415 tp->t_flags |= TF_ASYNC; 1416 else 1417 tp->t_flags &= ~TF_ASYNC; 1418 return (0); 1419 case FIONBIO: 1420 /* This device supports non-blocking operation. */ 1421 return (0); 1422 case FIONREAD: 1423 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq); 1424 return (0); 1425 case FIONWRITE: 1426 case TIOCOUTQ: 1427 *(int *)data = ttyoutq_bytesused(&tp->t_outq); 1428 return (0); 1429 case FIOSETOWN: 1430 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1431 /* Not allowed to set ownership. */ 1432 return (ENOTTY); 1433 1434 /* Temporarily unlock the TTY to set ownership. */ 1435 tty_unlock(tp); 1436 error = fsetown(*(int *)data, &tp->t_sigio); 1437 tty_lock(tp); 1438 return (error); 1439 case FIOGETOWN: 1440 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1441 /* Not allowed to set ownership. */ 1442 return (ENOTTY); 1443 1444 /* Get ownership. */ 1445 *(int *)data = fgetown(&tp->t_sigio); 1446 return (0); 1447 case TIOCGETA: 1448 /* Obtain terminal flags through tcgetattr(). */ 1449 *(struct termios*)data = tp->t_termios; 1450 return (0); 1451 case TIOCSETA: 1452 case TIOCSETAW: 1453 case TIOCSETAF: { 1454 struct termios *t = data; 1455 1456 /* 1457 * Who makes up these funny rules? According to POSIX, 1458 * input baud rate is set equal to the output baud rate 1459 * when zero. 1460 */ 1461 if (t->c_ispeed == 0) 1462 t->c_ispeed = t->c_ospeed; 1463 1464 /* Discard any unsupported bits. */ 1465 t->c_iflag &= TTYSUP_IFLAG; 1466 t->c_oflag &= TTYSUP_OFLAG; 1467 t->c_lflag &= TTYSUP_LFLAG; 1468 t->c_cflag &= TTYSUP_CFLAG; 1469 1470 /* Set terminal flags through tcsetattr(). */ 1471 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1472 error = tty_drain(tp); 1473 if (error) 1474 return (error); 1475 if (cmd == TIOCSETAF) 1476 tty_flush(tp, FREAD); 1477 } 1478 1479 /* 1480 * Only call param() when the flags really change. 1481 */ 1482 if ((t->c_cflag & CIGNORE) == 0 && 1483 (tp->t_termios.c_cflag != t->c_cflag || 1484 tp->t_termios.c_ispeed != t->c_ispeed || 1485 tp->t_termios.c_ospeed != t->c_ospeed)) { 1486 error = ttydevsw_param(tp, t); 1487 if (error) 1488 return (error); 1489 1490 /* XXX: CLOCAL? */ 1491 1492 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE; 1493 tp->t_termios.c_ispeed = t->c_ispeed; 1494 tp->t_termios.c_ospeed = t->c_ospeed; 1495 1496 /* Baud rate has changed - update watermarks. */ 1497 tty_watermarks(tp); 1498 } 1499 1500 /* Copy new non-device driver parameters. */ 1501 tp->t_termios.c_iflag = t->c_iflag; 1502 tp->t_termios.c_oflag = t->c_oflag; 1503 tp->t_termios.c_lflag = t->c_lflag; 1504 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc); 1505 1506 ttydisc_optimize(tp); 1507 1508 if ((t->c_lflag & ICANON) == 0) { 1509 /* 1510 * When in non-canonical mode, wake up all 1511 * readers. Canonicalize any partial input. VMIN 1512 * and VTIME could also be adjusted. 1513 */ 1514 ttyinq_canonicalize(&tp->t_inq); 1515 tty_wakeup(tp, FREAD); 1516 } 1517 1518 /* 1519 * For packet mode: notify the PTY consumer that VSTOP 1520 * and VSTART may have been changed. 1521 */ 1522 if (tp->t_termios.c_iflag & IXON && 1523 tp->t_termios.c_cc[VSTOP] == CTRL('S') && 1524 tp->t_termios.c_cc[VSTART] == CTRL('Q')) 1525 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP); 1526 else 1527 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP); 1528 return (0); 1529 } 1530 case TIOCGETD: 1531 /* For compatibility - we only support TTYDISC. */ 1532 *(int *)data = TTYDISC; 1533 return (0); 1534 case TIOCGPGRP: 1535 if (!tty_is_ctty(tp, td->td_proc)) 1536 return (ENOTTY); 1537 1538 if (tp->t_pgrp != NULL) 1539 *(int *)data = tp->t_pgrp->pg_id; 1540 else 1541 *(int *)data = NO_PID; 1542 return (0); 1543 case TIOCGSID: 1544 if (!tty_is_ctty(tp, td->td_proc)) 1545 return (ENOTTY); 1546 1547 MPASS(tp->t_session); 1548 *(int *)data = tp->t_session->s_sid; 1549 return (0); 1550 case TIOCSCTTY: { 1551 struct proc *p = td->td_proc; 1552 1553 /* XXX: This looks awful. */ 1554 tty_unlock(tp); 1555 sx_xlock(&proctree_lock); 1556 tty_lock(tp); 1557 1558 if (!SESS_LEADER(p)) { 1559 /* Only the session leader may do this. */ 1560 sx_xunlock(&proctree_lock); 1561 return (EPERM); 1562 } 1563 1564 if (tp->t_session != NULL && tp->t_session == p->p_session) { 1565 /* This is already our controlling TTY. */ 1566 sx_xunlock(&proctree_lock); 1567 return (0); 1568 } 1569 1570 if (p->p_session->s_ttyp != NULL || 1571 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL && 1572 tp->t_session->s_ttyvp->v_type != VBAD)) { 1573 /* 1574 * There is already a relation between a TTY and 1575 * a session, or the caller is not the session 1576 * leader. 1577 * 1578 * Allow the TTY to be stolen when the vnode is 1579 * invalid, but the reference to the TTY is 1580 * still active. This allows immediate reuse of 1581 * TTYs of which the session leader has been 1582 * killed or the TTY revoked. 1583 */ 1584 sx_xunlock(&proctree_lock); 1585 return (EPERM); 1586 } 1587 1588 /* Connect the session to the TTY. */ 1589 tp->t_session = p->p_session; 1590 tp->t_session->s_ttyp = tp; 1591 tp->t_sessioncnt++; 1592 sx_xunlock(&proctree_lock); 1593 1594 /* Assign foreground process group. */ 1595 tp->t_pgrp = p->p_pgrp; 1596 PROC_LOCK(p); 1597 p->p_flag |= P_CONTROLT; 1598 PROC_UNLOCK(p); 1599 1600 return (0); 1601 } 1602 case TIOCSPGRP: { 1603 struct pgrp *pg; 1604 1605 /* 1606 * XXX: Temporarily unlock the TTY to locate the process 1607 * group. This code would be lot nicer if we would ever 1608 * decompose proctree_lock. 1609 */ 1610 tty_unlock(tp); 1611 sx_slock(&proctree_lock); 1612 pg = pgfind(*(int *)data); 1613 if (pg != NULL) 1614 PGRP_UNLOCK(pg); 1615 if (pg == NULL || pg->pg_session != td->td_proc->p_session) { 1616 sx_sunlock(&proctree_lock); 1617 tty_lock(tp); 1618 return (EPERM); 1619 } 1620 tty_lock(tp); 1621 1622 /* 1623 * Determine if this TTY is the controlling TTY after 1624 * relocking the TTY. 1625 */ 1626 if (!tty_is_ctty(tp, td->td_proc)) { 1627 sx_sunlock(&proctree_lock); 1628 return (ENOTTY); 1629 } 1630 tp->t_pgrp = pg; 1631 sx_sunlock(&proctree_lock); 1632 1633 /* Wake up the background process groups. */ 1634 cv_broadcast(&tp->t_bgwait); 1635 return (0); 1636 } 1637 case TIOCFLUSH: { 1638 int flags = *(int *)data; 1639 1640 if (flags == 0) 1641 flags = (FREAD|FWRITE); 1642 else 1643 flags &= (FREAD|FWRITE); 1644 tty_flush(tp, flags); 1645 return (0); 1646 } 1647 case TIOCDRAIN: 1648 /* Drain TTY output. */ 1649 return tty_drain(tp); 1650 case TIOCCONS: 1651 /* Set terminal as console TTY. */ 1652 if (*(int *)data) { 1653 error = priv_check(td, PRIV_TTY_CONSOLE); 1654 if (error) 1655 return (error); 1656 1657 /* 1658 * XXX: constty should really need to be locked! 1659 * XXX: allow disconnected constty's to be stolen! 1660 */ 1661 1662 if (constty == tp) 1663 return (0); 1664 if (constty != NULL) 1665 return (EBUSY); 1666 1667 tty_unlock(tp); 1668 constty_set(tp); 1669 tty_lock(tp); 1670 } else if (constty == tp) { 1671 constty_clear(); 1672 } 1673 return (0); 1674 case TIOCGWINSZ: 1675 /* Obtain window size. */ 1676 *(struct winsize*)data = tp->t_winsize; 1677 return (0); 1678 case TIOCSWINSZ: 1679 /* Set window size. */ 1680 if (bcmp(&tp->t_winsize, data, sizeof(struct winsize)) == 0) 1681 return (0); 1682 tp->t_winsize = *(struct winsize*)data; 1683 tty_signal_pgrp(tp, SIGWINCH); 1684 return (0); 1685 case TIOCEXCL: 1686 tp->t_flags |= TF_EXCLUDE; 1687 return (0); 1688 case TIOCNXCL: 1689 tp->t_flags &= ~TF_EXCLUDE; 1690 return (0); 1691 case TIOCSTOP: 1692 tp->t_flags |= TF_STOPPED; 1693 ttydevsw_pktnotify(tp, TIOCPKT_STOP); 1694 return (0); 1695 case TIOCSTART: 1696 tp->t_flags &= ~TF_STOPPED; 1697 ttydevsw_outwakeup(tp); 1698 ttydevsw_pktnotify(tp, TIOCPKT_START); 1699 return (0); 1700 case TIOCSTAT: 1701 tty_info(tp); 1702 return (0); 1703 case TIOCSTI: 1704 if ((fflag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI)) 1705 return (EPERM); 1706 if (!tty_is_ctty(tp, td->td_proc) && 1707 priv_check(td, PRIV_TTY_STI)) 1708 return (EACCES); 1709 ttydisc_rint(tp, *(char *)data, 0); 1710 ttydisc_rint_done(tp); 1711 return (0); 1712 } 1713 1714#ifdef COMPAT_43TTY 1715 return tty_ioctl_compat(tp, cmd, data, fflag, td); 1716#else /* !COMPAT_43TTY */ 1717 return (ENOIOCTL); 1718#endif /* COMPAT_43TTY */ 1719} 1720 1721int 1722tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, struct thread *td) 1723{ 1724 int error; 1725 1726 tty_lock_assert(tp, MA_OWNED); 1727 1728 if (tty_gone(tp)) 1729 return (ENXIO); 1730 1731 error = ttydevsw_ioctl(tp, cmd, data, td); 1732 if (error == ENOIOCTL) 1733 error = tty_generic_ioctl(tp, cmd, data, fflag, td); 1734 1735 return (error); 1736} 1737 1738dev_t 1739tty_udev(struct tty *tp) 1740{ 1741 if (tp->t_dev) 1742 return dev2udev(tp->t_dev); 1743 else 1744 return NODEV; 1745} 1746 1747int 1748tty_checkoutq(struct tty *tp) 1749{ 1750 1751 /* 256 bytes should be enough to print a log message. */ 1752 return (ttyoutq_bytesleft(&tp->t_outq) >= 256); 1753} 1754 1755void 1756tty_hiwat_in_block(struct tty *tp) 1757{ 1758 1759 if ((tp->t_flags & TF_HIWAT_IN) == 0 && 1760 tp->t_termios.c_iflag & IXOFF && 1761 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) { 1762 /* 1763 * Input flow control. Only enter the high watermark when we 1764 * can successfully store the VSTOP character. 1765 */ 1766 if (ttyoutq_write_nofrag(&tp->t_outq, 1767 &tp->t_termios.c_cc[VSTOP], 1) == 0) 1768 tp->t_flags |= TF_HIWAT_IN; 1769 } else { 1770 /* No input flow control. */ 1771 tp->t_flags |= TF_HIWAT_IN; 1772 } 1773} 1774 1775void 1776tty_hiwat_in_unblock(struct tty *tp) 1777{ 1778 1779 if (tp->t_flags & TF_HIWAT_IN && 1780 tp->t_termios.c_iflag & IXOFF && 1781 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) { 1782 /* 1783 * Input flow control. Only leave the high watermark when we 1784 * can successfully store the VSTART character. 1785 */ 1786 if (ttyoutq_write_nofrag(&tp->t_outq, 1787 &tp->t_termios.c_cc[VSTART], 1) == 0) 1788 tp->t_flags &= ~TF_HIWAT_IN; 1789 } else { 1790 /* No input flow control. */ 1791 tp->t_flags &= ~TF_HIWAT_IN; 1792 } 1793 1794 if (!tty_gone(tp)) 1795 ttydevsw_inwakeup(tp); 1796} 1797 1798/* 1799 * TTY hooks interface. 1800 */ 1801 1802static int 1803ttyhook_defrint(struct tty *tp, char c, int flags) 1804{ 1805 1806 if (ttyhook_rint_bypass(tp, &c, 1) != 1) 1807 return (-1); 1808 1809 return (0); 1810} 1811 1812int 1813ttyhook_register(struct tty **rtp, struct proc *p, int fd, 1814 struct ttyhook *th, void *softc) 1815{ 1816 struct tty *tp; 1817 struct file *fp; 1818#ifdef CAPABILITIES 1819 struct file *fp_cap; 1820#endif 1821 struct cdev *dev; 1822 struct cdevsw *cdp; 1823 struct filedesc *fdp; 1824 int error, ref; 1825 1826 /* Validate the file descriptor. */ 1827 if ((fdp = p->p_fd) == NULL) 1828 return (EBADF); 1829 1830 fp = fget_unlocked(fdp, fd); 1831 if (fp == NULL) 1832 return (EBADF); 1833 if (fp->f_ops == &badfileops) { 1834 error = EBADF; 1835 goto done1; 1836 } 1837 1838#ifdef CAPABILITIES 1839 fp_cap = fp; 1840 error = cap_funwrap(fp_cap, CAP_TTYHOOK, &fp); 1841 if (error) 1842 return (error); 1843#endif 1844 1845 /* 1846 * Make sure the vnode is bound to a character device. 1847 * Unlocked check for the vnode type is ok there, because we 1848 * only shall prevent calling devvn_refthread on the file that 1849 * never has been opened over a character device. 1850 */ 1851 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) { 1852 error = EINVAL; 1853 goto done1; 1854 } 1855 1856 /* Make sure it is a TTY. */ 1857 cdp = devvn_refthread(fp->f_vnode, &dev, &ref); 1858 if (cdp == NULL) { 1859 error = ENXIO; 1860 goto done1; 1861 } 1862 if (dev != fp->f_data) { 1863 error = ENXIO; 1864 goto done2; 1865 } 1866 if (cdp != &ttydev_cdevsw) { 1867 error = ENOTTY; 1868 goto done2; 1869 } 1870 tp = dev->si_drv1; 1871 1872 /* Try to attach the hook to the TTY. */ 1873 error = EBUSY; 1874 tty_lock(tp); 1875 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0)); 1876 if (tp->t_flags & TF_HOOK) 1877 goto done3; 1878 1879 tp->t_flags |= TF_HOOK; 1880 tp->t_hook = th; 1881 tp->t_hooksoftc = softc; 1882 *rtp = tp; 1883 error = 0; 1884 1885 /* Maybe we can switch into bypass mode now. */ 1886 ttydisc_optimize(tp); 1887 1888 /* Silently convert rint() calls to rint_bypass() when possible. */ 1889 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass)) 1890 th->th_rint = ttyhook_defrint; 1891 1892done3: tty_unlock(tp); 1893done2: dev_relthread(dev, ref); 1894done1: fdrop(fp, curthread); 1895 return (error); 1896} 1897 1898void 1899ttyhook_unregister(struct tty *tp) 1900{ 1901 1902 tty_lock_assert(tp, MA_OWNED); 1903 MPASS(tp->t_flags & TF_HOOK); 1904 1905 /* Disconnect the hook. */ 1906 tp->t_flags &= ~TF_HOOK; 1907 tp->t_hook = NULL; 1908 1909 /* Maybe we need to leave bypass mode. */ 1910 ttydisc_optimize(tp); 1911 1912 /* Maybe deallocate the TTY as well. */ 1913 tty_rel_free(tp); 1914} 1915 1916/* 1917 * /dev/console handling. 1918 */ 1919 1920static int 1921ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 1922{ 1923 struct tty *tp; 1924 1925 /* System has no console device. */ 1926 if (dev_console_filename == NULL) 1927 return (ENXIO); 1928 1929 /* Look up corresponding TTY by device name. */ 1930 sx_slock(&tty_list_sx); 1931 TAILQ_FOREACH(tp, &tty_list, t_list) { 1932 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) { 1933 dev_console->si_drv1 = tp; 1934 break; 1935 } 1936 } 1937 sx_sunlock(&tty_list_sx); 1938 1939 /* System console has no TTY associated. */ 1940 if (dev_console->si_drv1 == NULL) 1941 return (ENXIO); 1942 1943 return (ttydev_open(dev, oflags, devtype, td)); 1944} 1945 1946static int 1947ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag) 1948{ 1949 1950 log_console(uio); 1951 1952 return (ttydev_write(dev, uio, ioflag)); 1953} 1954 1955/* 1956 * /dev/console is a little different than normal TTY's. When opened, 1957 * it determines which TTY to use. When data gets written to it, it 1958 * will be logged in the kernel message buffer. 1959 */ 1960static struct cdevsw ttyconsdev_cdevsw = { 1961 .d_version = D_VERSION, 1962 .d_open = ttyconsdev_open, 1963 .d_close = ttydev_close, 1964 .d_read = ttydev_read, 1965 .d_write = ttyconsdev_write, 1966 .d_ioctl = ttydev_ioctl, 1967 .d_kqfilter = ttydev_kqfilter, 1968 .d_poll = ttydev_poll, 1969 .d_mmap = ttydev_mmap, 1970 .d_name = "ttyconsdev", 1971 .d_flags = D_TTY, 1972}; 1973 1974static void 1975ttyconsdev_init(void *unused) 1976{ 1977 1978 dev_console = make_dev_credf(MAKEDEV_ETERNAL, &ttyconsdev_cdevsw, 0, 1979 NULL, UID_ROOT, GID_WHEEL, 0600, "console"); 1980} 1981 1982SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL); 1983 1984void 1985ttyconsdev_select(const char *name) 1986{ 1987 1988 dev_console_filename = name; 1989} 1990 1991/* 1992 * Debugging routines. 1993 */ 1994 1995#include "opt_ddb.h" 1996#ifdef DDB 1997#include <ddb/ddb.h> 1998#include <ddb/db_sym.h> 1999 2000static struct { 2001 int flag; 2002 char val; 2003} ttystates[] = { 2004#if 0 2005 { TF_NOPREFIX, 'N' }, 2006#endif 2007 { TF_INITLOCK, 'I' }, 2008 { TF_CALLOUT, 'C' }, 2009 2010 /* Keep these together -> 'Oi' and 'Oo'. */ 2011 { TF_OPENED, 'O' }, 2012 { TF_OPENED_IN, 'i' }, 2013 { TF_OPENED_OUT, 'o' }, 2014 { TF_OPENED_CONS, 'c' }, 2015 2016 { TF_GONE, 'G' }, 2017 { TF_OPENCLOSE, 'B' }, 2018 { TF_ASYNC, 'Y' }, 2019 { TF_LITERAL, 'L' }, 2020 2021 /* Keep these together -> 'Hi' and 'Ho'. */ 2022 { TF_HIWAT, 'H' }, 2023 { TF_HIWAT_IN, 'i' }, 2024 { TF_HIWAT_OUT, 'o' }, 2025 2026 { TF_STOPPED, 'S' }, 2027 { TF_EXCLUDE, 'X' }, 2028 { TF_BYPASS, 'l' }, 2029 { TF_ZOMBIE, 'Z' }, 2030 { TF_HOOK, 's' }, 2031 2032 /* Keep these together -> 'bi' and 'bo'. */ 2033 { TF_BUSY, 'b' }, 2034 { TF_BUSY_IN, 'i' }, 2035 { TF_BUSY_OUT, 'o' }, 2036 2037 { 0, '\0'}, 2038}; 2039 2040#define TTY_FLAG_BITS \ 2041 "\20\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \ 2042 "\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \ 2043 "\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK" 2044 2045#define DB_PRINTSYM(name, addr) \ 2046 db_printf("%s " #name ": ", sep); \ 2047 db_printsym((db_addr_t) addr, DB_STGY_ANY); \ 2048 db_printf("\n"); 2049 2050static void 2051_db_show_devsw(const char *sep, const struct ttydevsw *tsw) 2052{ 2053 db_printf("%sdevsw: ", sep); 2054 db_printsym((db_addr_t)tsw, DB_STGY_ANY); 2055 db_printf(" (%p)\n", tsw); 2056 DB_PRINTSYM(open, tsw->tsw_open); 2057 DB_PRINTSYM(close, tsw->tsw_close); 2058 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup); 2059 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup); 2060 DB_PRINTSYM(ioctl, tsw->tsw_ioctl); 2061 DB_PRINTSYM(param, tsw->tsw_param); 2062 DB_PRINTSYM(modem, tsw->tsw_modem); 2063 DB_PRINTSYM(mmap, tsw->tsw_mmap); 2064 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify); 2065 DB_PRINTSYM(free, tsw->tsw_free); 2066} 2067static void 2068_db_show_hooks(const char *sep, const struct ttyhook *th) 2069{ 2070 db_printf("%shook: ", sep); 2071 db_printsym((db_addr_t)th, DB_STGY_ANY); 2072 db_printf(" (%p)\n", th); 2073 if (th == NULL) 2074 return; 2075 DB_PRINTSYM(rint, th->th_rint); 2076 DB_PRINTSYM(rint_bypass, th->th_rint_bypass); 2077 DB_PRINTSYM(rint_done, th->th_rint_done); 2078 DB_PRINTSYM(rint_poll, th->th_rint_poll); 2079 DB_PRINTSYM(getc_inject, th->th_getc_inject); 2080 DB_PRINTSYM(getc_capture, th->th_getc_capture); 2081 DB_PRINTSYM(getc_poll, th->th_getc_poll); 2082 DB_PRINTSYM(close, th->th_close); 2083} 2084 2085static void 2086_db_show_termios(const char *name, const struct termios *t) 2087{ 2088 2089 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x " 2090 "lflag 0x%x ispeed %u ospeed %u\n", name, 2091 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag, 2092 t->c_ispeed, t->c_ospeed); 2093} 2094 2095/* DDB command to show TTY statistics. */ 2096DB_SHOW_COMMAND(tty, db_show_tty) 2097{ 2098 struct tty *tp; 2099 2100 if (!have_addr) { 2101 db_printf("usage: show tty <addr>\n"); 2102 return; 2103 } 2104 tp = (struct tty *)addr; 2105 2106 db_printf("0x%p: %s\n", tp, tty_devname(tp)); 2107 db_printf("\tmtx: %p\n", tp->t_mtx); 2108 db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS); 2109 db_printf("\trevokecnt: %u\n", tp->t_revokecnt); 2110 2111 /* Buffering mechanisms. */ 2112 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u " 2113 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin, 2114 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end, 2115 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota); 2116 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n", 2117 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end, 2118 tp->t_outq.to_nblocks, tp->t_outq.to_quota); 2119 db_printf("\tinlow: %zu\n", tp->t_inlow); 2120 db_printf("\toutlow: %zu\n", tp->t_outlow); 2121 _db_show_termios("\ttermios", &tp->t_termios); 2122 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n", 2123 tp->t_winsize.ws_row, tp->t_winsize.ws_col, 2124 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel); 2125 db_printf("\tcolumn: %u\n", tp->t_column); 2126 db_printf("\twritepos: %u\n", tp->t_writepos); 2127 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags); 2128 2129 /* Init/lock-state devices. */ 2130 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in); 2131 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out); 2132 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in); 2133 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out); 2134 2135 /* Hooks */ 2136 _db_show_devsw("\t", tp->t_devsw); 2137 _db_show_hooks("\t", tp->t_hook); 2138 2139 /* Process info. */ 2140 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp, 2141 tp->t_pgrp ? tp->t_pgrp->pg_id : 0, 2142 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0); 2143 db_printf("\tsession: %p", tp->t_session); 2144 if (tp->t_session != NULL) 2145 db_printf(" count %u leader %p tty %p sid %d login %s", 2146 tp->t_session->s_count, tp->t_session->s_leader, 2147 tp->t_session->s_ttyp, tp->t_session->s_sid, 2148 tp->t_session->s_login); 2149 db_printf("\n"); 2150 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt); 2151 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc); 2152 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc); 2153 db_printf("\tdev: %p\n", tp->t_dev); 2154} 2155 2156/* DDB command to list TTYs. */ 2157DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys) 2158{ 2159 struct tty *tp; 2160 size_t isiz, osiz; 2161 int i, j; 2162 2163 /* Make the output look like `pstat -t'. */ 2164 db_printf("PTR "); 2165#if defined(__LP64__) 2166 db_printf(" "); 2167#endif 2168 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW " 2169 "COL SESS PGID STATE\n"); 2170 2171 TAILQ_FOREACH(tp, &tty_list, t_list) { 2172 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE; 2173 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE; 2174 2175 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ", 2176 tp, 2177 tty_devname(tp), 2178 isiz, 2179 tp->t_inq.ti_linestart - tp->t_inq.ti_begin, 2180 tp->t_inq.ti_end - tp->t_inq.ti_linestart, 2181 isiz - tp->t_inlow, 2182 osiz, 2183 tp->t_outq.to_end - tp->t_outq.to_begin, 2184 osiz - tp->t_outlow, 2185 MIN(tp->t_column, 99999), 2186 tp->t_session ? tp->t_session->s_sid : 0, 2187 tp->t_pgrp ? tp->t_pgrp->pg_id : 0); 2188 2189 /* Flag bits. */ 2190 for (i = j = 0; ttystates[i].flag; i++) 2191 if (tp->t_flags & ttystates[i].flag) { 2192 db_printf("%c", ttystates[i].val); 2193 j++; 2194 } 2195 if (j == 0) 2196 db_printf("-"); 2197 db_printf("\n"); 2198 } 2199} 2200#endif /* DDB */ 2201