tty.c revision 237219
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 237219 2012-06-18 07:34:38Z pho $"); 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; 223 int error = 0; 224 225 while ((tp = dev->si_drv1) == NULL) { 226 error = tsleep(&dev->si_drv1, PCATCH, "ttdrv1", 1); 227 if (error != EWOULDBLOCK) 228 return (error); 229 } 230 231 tty_lock(tp); 232 if (tty_gone(tp)) { 233 /* Device is already gone. */ 234 tty_unlock(tp); 235 return (ENXIO); 236 } 237 238 /* 239 * Block when other processes are currently opening or closing 240 * the TTY. 241 */ 242 while (tp->t_flags & TF_OPENCLOSE) { 243 error = tty_wait(tp, &tp->t_dcdwait); 244 if (error != 0) { 245 tty_unlock(tp); 246 return (error); 247 } 248 } 249 tp->t_flags |= TF_OPENCLOSE; 250 251 /* 252 * Make sure the "tty" and "cua" device cannot be opened at the 253 * same time. 254 */ 255 if (TTY_CALLOUT(tp, dev)) { 256 if (tp->t_flags & TF_OPENED_IN) { 257 error = EBUSY; 258 goto done; 259 } 260 } else { 261 if (tp->t_flags & TF_OPENED_OUT) { 262 error = EBUSY; 263 goto done; 264 } 265 } 266 267 if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) { 268 error = EBUSY; 269 goto done; 270 } 271 272 if (!tty_opened(tp)) { 273 /* Set proper termios flags. */ 274 if (TTY_CALLOUT(tp, dev)) 275 tp->t_termios = tp->t_termios_init_out; 276 else 277 tp->t_termios = tp->t_termios_init_in; 278 ttydevsw_param(tp, &tp->t_termios); 279 /* Prevent modem control on callout devices and /dev/console. */ 280 if (TTY_CALLOUT(tp, dev) || dev == dev_console) 281 tp->t_termios.c_cflag |= CLOCAL; 282 283 ttydevsw_modem(tp, SER_DTR|SER_RTS, 0); 284 285 error = ttydevsw_open(tp); 286 if (error != 0) 287 goto done; 288 289 ttydisc_open(tp); 290 tty_watermarks(tp); 291 } 292 293 /* Wait for Carrier Detect. */ 294 if ((oflags & O_NONBLOCK) == 0 && 295 (tp->t_termios.c_cflag & CLOCAL) == 0) { 296 while ((ttydevsw_modem(tp, 0, 0) & SER_DCD) == 0) { 297 error = tty_wait(tp, &tp->t_dcdwait); 298 if (error != 0) 299 goto done; 300 } 301 } 302 303 if (dev == dev_console) 304 tp->t_flags |= TF_OPENED_CONS; 305 else if (TTY_CALLOUT(tp, dev)) 306 tp->t_flags |= TF_OPENED_OUT; 307 else 308 tp->t_flags |= TF_OPENED_IN; 309 310done: tp->t_flags &= ~TF_OPENCLOSE; 311 cv_broadcast(&tp->t_dcdwait); 312 ttydev_leave(tp); 313 314 return (error); 315} 316 317static int 318ttydev_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 319{ 320 struct tty *tp = dev->si_drv1; 321 322 tty_lock(tp); 323 324 /* 325 * Don't actually close the device if it is being used as the 326 * console. 327 */ 328 MPASS((tp->t_flags & TF_OPENED) != TF_OPENED); 329 if (dev == dev_console) 330 tp->t_flags &= ~TF_OPENED_CONS; 331 else 332 tp->t_flags &= ~(TF_OPENED_IN|TF_OPENED_OUT); 333 334 if (tp->t_flags & TF_OPENED) { 335 tty_unlock(tp); 336 return (0); 337 } 338 339 /* 340 * This can only be called once. The callin and the callout 341 * devices cannot be opened at the same time. 342 */ 343 tp->t_flags &= ~(TF_EXCLUDE|TF_STOPPED); 344 345 /* Properly wake up threads that are stuck - revoke(). */ 346 tp->t_revokecnt++; 347 tty_wakeup(tp, FREAD|FWRITE); 348 cv_broadcast(&tp->t_bgwait); 349 cv_broadcast(&tp->t_dcdwait); 350 351 ttydev_leave(tp); 352 353 return (0); 354} 355 356static __inline int 357tty_is_ctty(struct tty *tp, struct proc *p) 358{ 359 tty_lock_assert(tp, MA_OWNED); 360 361 return (p->p_session == tp->t_session && p->p_flag & P_CONTROLT); 362} 363 364static int 365tty_wait_background(struct tty *tp, struct thread *td, int sig) 366{ 367 struct proc *p = td->td_proc; 368 struct pgrp *pg; 369 ksiginfo_t ksi; 370 int error; 371 372 MPASS(sig == SIGTTIN || sig == SIGTTOU); 373 tty_lock_assert(tp, MA_OWNED); 374 375 for (;;) { 376 PROC_LOCK(p); 377 /* 378 * The process should only sleep, when: 379 * - This terminal is the controling terminal 380 * - Its process group is not the foreground process 381 * group 382 * - The parent process isn't waiting for the child to 383 * exit 384 * - the signal to send to the process isn't masked 385 */ 386 if (!tty_is_ctty(tp, p) || p->p_pgrp == tp->t_pgrp) { 387 /* Allow the action to happen. */ 388 PROC_UNLOCK(p); 389 return (0); 390 } 391 392 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, sig) || 393 SIGISMEMBER(td->td_sigmask, sig)) { 394 /* Only allow them in write()/ioctl(). */ 395 PROC_UNLOCK(p); 396 return (sig == SIGTTOU ? 0 : EIO); 397 } 398 399 pg = p->p_pgrp; 400 if (p->p_flag & P_PPWAIT || pg->pg_jobc == 0) { 401 /* Don't allow the action to happen. */ 402 PROC_UNLOCK(p); 403 return (EIO); 404 } 405 PROC_UNLOCK(p); 406 407 /* 408 * Send the signal and sleep until we're the new 409 * foreground process group. 410 */ 411 if (sig != 0) { 412 ksiginfo_init(&ksi); 413 ksi.ksi_code = SI_KERNEL; 414 ksi.ksi_signo = sig; 415 sig = 0; 416 } 417 PGRP_LOCK(pg); 418 pgsignal(pg, ksi.ksi_signo, 1, &ksi); 419 PGRP_UNLOCK(pg); 420 421 error = tty_wait(tp, &tp->t_bgwait); 422 if (error) 423 return (error); 424 } 425} 426 427static int 428ttydev_read(struct cdev *dev, struct uio *uio, int ioflag) 429{ 430 struct tty *tp = dev->si_drv1; 431 int error; 432 433 error = ttydev_enter(tp); 434 if (error) 435 goto done; 436 437 error = tty_wait_background(tp, curthread, SIGTTIN); 438 if (error) { 439 tty_unlock(tp); 440 goto done; 441 } 442 443 error = ttydisc_read(tp, uio, ioflag); 444 tty_unlock(tp); 445 446 /* 447 * The read() call should not throw an error when the device is 448 * being destroyed. Silently convert it to an EOF. 449 */ 450done: if (error == ENXIO) 451 error = 0; 452 return (error); 453} 454 455static int 456ttydev_write(struct cdev *dev, struct uio *uio, int ioflag) 457{ 458 struct tty *tp = dev->si_drv1; 459 int error; 460 461 error = ttydev_enter(tp); 462 if (error) 463 return (error); 464 465 if (tp->t_termios.c_lflag & TOSTOP) { 466 error = tty_wait_background(tp, curthread, SIGTTOU); 467 if (error) 468 goto done; 469 } 470 471 if (ioflag & IO_NDELAY && tp->t_flags & TF_BUSY_OUT) { 472 /* Allow non-blocking writes to bypass serialization. */ 473 error = ttydisc_write(tp, uio, ioflag); 474 } else { 475 /* Serialize write() calls. */ 476 while (tp->t_flags & TF_BUSY_OUT) { 477 error = tty_wait(tp, &tp->t_outserwait); 478 if (error) 479 goto done; 480 } 481 482 tp->t_flags |= TF_BUSY_OUT; 483 error = ttydisc_write(tp, uio, ioflag); 484 tp->t_flags &= ~TF_BUSY_OUT; 485 cv_signal(&tp->t_outserwait); 486 } 487 488done: tty_unlock(tp); 489 return (error); 490} 491 492static int 493ttydev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 494 struct thread *td) 495{ 496 struct tty *tp = dev->si_drv1; 497 int error; 498 499 error = ttydev_enter(tp); 500 if (error) 501 return (error); 502 503 switch (cmd) { 504 case TIOCCBRK: 505 case TIOCCONS: 506 case TIOCDRAIN: 507 case TIOCEXCL: 508 case TIOCFLUSH: 509 case TIOCNXCL: 510 case TIOCSBRK: 511 case TIOCSCTTY: 512 case TIOCSETA: 513 case TIOCSETAF: 514 case TIOCSETAW: 515 case TIOCSPGRP: 516 case TIOCSTART: 517 case TIOCSTAT: 518 case TIOCSTI: 519 case TIOCSTOP: 520 case TIOCSWINSZ: 521#if 0 522 case TIOCSDRAINWAIT: 523 case TIOCSETD: 524#endif 525#ifdef COMPAT_43TTY 526 case TIOCLBIC: 527 case TIOCLBIS: 528 case TIOCLSET: 529 case TIOCSETC: 530 case OTIOCSETD: 531 case TIOCSETN: 532 case TIOCSETP: 533 case TIOCSLTC: 534#endif /* COMPAT_43TTY */ 535 /* 536 * If the ioctl() causes the TTY to be modified, let it 537 * wait in the background. 538 */ 539 error = tty_wait_background(tp, curthread, SIGTTOU); 540 if (error) 541 goto done; 542 } 543 544 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 545 struct termios *old = &tp->t_termios; 546 struct termios *new = (struct termios *)data; 547 struct termios *lock = TTY_CALLOUT(tp, dev) ? 548 &tp->t_termios_lock_out : &tp->t_termios_lock_in; 549 int cc; 550 551 /* 552 * Lock state devices. Just overwrite the values of the 553 * commands that are currently in use. 554 */ 555 new->c_iflag = (old->c_iflag & lock->c_iflag) | 556 (new->c_iflag & ~lock->c_iflag); 557 new->c_oflag = (old->c_oflag & lock->c_oflag) | 558 (new->c_oflag & ~lock->c_oflag); 559 new->c_cflag = (old->c_cflag & lock->c_cflag) | 560 (new->c_cflag & ~lock->c_cflag); 561 new->c_lflag = (old->c_lflag & lock->c_lflag) | 562 (new->c_lflag & ~lock->c_lflag); 563 for (cc = 0; cc < NCCS; ++cc) 564 if (lock->c_cc[cc]) 565 new->c_cc[cc] = old->c_cc[cc]; 566 if (lock->c_ispeed) 567 new->c_ispeed = old->c_ispeed; 568 if (lock->c_ospeed) 569 new->c_ospeed = old->c_ospeed; 570 } 571 572 error = tty_ioctl(tp, cmd, data, fflag, td); 573done: tty_unlock(tp); 574 575 return (error); 576} 577 578static int 579ttydev_poll(struct cdev *dev, int events, struct thread *td) 580{ 581 struct tty *tp = dev->si_drv1; 582 int error, revents = 0; 583 584 error = ttydev_enter(tp); 585 if (error) 586 return ((events & (POLLIN|POLLRDNORM)) | POLLHUP); 587 588 if (events & (POLLIN|POLLRDNORM)) { 589 /* See if we can read something. */ 590 if (ttydisc_read_poll(tp) > 0) 591 revents |= events & (POLLIN|POLLRDNORM); 592 } 593 594 if (tp->t_flags & TF_ZOMBIE) { 595 /* Hangup flag on zombie state. */ 596 revents |= POLLHUP; 597 } else if (events & (POLLOUT|POLLWRNORM)) { 598 /* See if we can write something. */ 599 if (ttydisc_write_poll(tp) > 0) 600 revents |= events & (POLLOUT|POLLWRNORM); 601 } 602 603 if (revents == 0) { 604 if (events & (POLLIN|POLLRDNORM)) 605 selrecord(td, &tp->t_inpoll); 606 if (events & (POLLOUT|POLLWRNORM)) 607 selrecord(td, &tp->t_outpoll); 608 } 609 610 tty_unlock(tp); 611 612 return (revents); 613} 614 615static int 616ttydev_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 617 int nprot, vm_memattr_t *memattr) 618{ 619 struct tty *tp = dev->si_drv1; 620 int error; 621 622 /* Handle mmap() through the driver. */ 623 624 error = ttydev_enter(tp); 625 if (error) 626 return (-1); 627 error = ttydevsw_mmap(tp, offset, paddr, nprot, memattr); 628 tty_unlock(tp); 629 630 return (error); 631} 632 633/* 634 * kqueue support. 635 */ 636 637static void 638tty_kqops_read_detach(struct knote *kn) 639{ 640 struct tty *tp = kn->kn_hook; 641 642 knlist_remove(&tp->t_inpoll.si_note, kn, 0); 643} 644 645static int 646tty_kqops_read_event(struct knote *kn, long hint) 647{ 648 struct tty *tp = kn->kn_hook; 649 650 tty_lock_assert(tp, MA_OWNED); 651 652 if (tty_gone(tp) || tp->t_flags & TF_ZOMBIE) { 653 kn->kn_flags |= EV_EOF; 654 return (1); 655 } else { 656 kn->kn_data = ttydisc_read_poll(tp); 657 return (kn->kn_data > 0); 658 } 659} 660 661static void 662tty_kqops_write_detach(struct knote *kn) 663{ 664 struct tty *tp = kn->kn_hook; 665 666 knlist_remove(&tp->t_outpoll.si_note, kn, 0); 667} 668 669static int 670tty_kqops_write_event(struct knote *kn, long hint) 671{ 672 struct tty *tp = kn->kn_hook; 673 674 tty_lock_assert(tp, MA_OWNED); 675 676 if (tty_gone(tp)) { 677 kn->kn_flags |= EV_EOF; 678 return (1); 679 } else { 680 kn->kn_data = ttydisc_write_poll(tp); 681 return (kn->kn_data > 0); 682 } 683} 684 685static struct filterops tty_kqops_read = { 686 .f_isfd = 1, 687 .f_detach = tty_kqops_read_detach, 688 .f_event = tty_kqops_read_event, 689}; 690static struct filterops tty_kqops_write = { 691 .f_isfd = 1, 692 .f_detach = tty_kqops_write_detach, 693 .f_event = tty_kqops_write_event, 694}; 695 696static int 697ttydev_kqfilter(struct cdev *dev, struct knote *kn) 698{ 699 struct tty *tp = dev->si_drv1; 700 int error; 701 702 error = ttydev_enter(tp); 703 if (error) 704 return (error); 705 706 switch (kn->kn_filter) { 707 case EVFILT_READ: 708 kn->kn_hook = tp; 709 kn->kn_fop = &tty_kqops_read; 710 knlist_add(&tp->t_inpoll.si_note, kn, 1); 711 break; 712 case EVFILT_WRITE: 713 kn->kn_hook = tp; 714 kn->kn_fop = &tty_kqops_write; 715 knlist_add(&tp->t_outpoll.si_note, kn, 1); 716 break; 717 default: 718 error = EINVAL; 719 break; 720 } 721 722 tty_unlock(tp); 723 return (error); 724} 725 726static struct cdevsw ttydev_cdevsw = { 727 .d_version = D_VERSION, 728 .d_open = ttydev_open, 729 .d_close = ttydev_close, 730 .d_read = ttydev_read, 731 .d_write = ttydev_write, 732 .d_ioctl = ttydev_ioctl, 733 .d_kqfilter = ttydev_kqfilter, 734 .d_poll = ttydev_poll, 735 .d_mmap = ttydev_mmap, 736 .d_name = "ttydev", 737 .d_flags = D_TTY, 738}; 739 740/* 741 * Init/lock-state devices 742 */ 743 744static int 745ttyil_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 746{ 747 struct tty *tp; 748 int error = 0; 749 750 while ((tp = dev->si_drv1) == NULL) { 751 error = tsleep(&dev->si_drv1, PCATCH, "ttdrv1", 1); 752 if (error != EWOULDBLOCK) 753 return (error); 754 } 755 tty_lock(tp); 756 if (tty_gone(tp)) 757 error = ENODEV; 758 tty_unlock(tp); 759 760 return (error); 761} 762 763static int 764ttyil_close(struct cdev *dev, int flag, int mode, struct thread *td) 765{ 766 return (0); 767} 768 769static int 770ttyil_rdwr(struct cdev *dev, struct uio *uio, int ioflag) 771{ 772 return (ENODEV); 773} 774 775static int 776ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 777 struct thread *td) 778{ 779 struct tty *tp = dev->si_drv1; 780 int error; 781 782 tty_lock(tp); 783 if (tty_gone(tp)) { 784 error = ENODEV; 785 goto done; 786 } 787 788 error = ttydevsw_cioctl(tp, dev2unit(dev), cmd, data, td); 789 if (error != ENOIOCTL) 790 goto done; 791 error = 0; 792 793 switch (cmd) { 794 case TIOCGETA: 795 /* Obtain terminal flags through tcgetattr(). */ 796 *(struct termios*)data = *(struct termios*)dev->si_drv2; 797 break; 798 case TIOCSETA: 799 /* Set terminal flags through tcsetattr(). */ 800 error = priv_check(td, PRIV_TTY_SETA); 801 if (error) 802 break; 803 *(struct termios*)dev->si_drv2 = *(struct termios*)data; 804 break; 805 case TIOCGETD: 806 *(int *)data = TTYDISC; 807 break; 808 case TIOCGWINSZ: 809 bzero(data, sizeof(struct winsize)); 810 break; 811 default: 812 error = ENOTTY; 813 } 814 815done: tty_unlock(tp); 816 return (error); 817} 818 819static struct cdevsw ttyil_cdevsw = { 820 .d_version = D_VERSION, 821 .d_open = ttyil_open, 822 .d_close = ttyil_close, 823 .d_read = ttyil_rdwr, 824 .d_write = ttyil_rdwr, 825 .d_ioctl = ttyil_ioctl, 826 .d_name = "ttyil", 827 .d_flags = D_TTY, 828}; 829 830static void 831tty_init_termios(struct tty *tp) 832{ 833 struct termios *t = &tp->t_termios_init_in; 834 835 t->c_cflag = TTYDEF_CFLAG; 836 t->c_iflag = TTYDEF_IFLAG; 837 t->c_lflag = TTYDEF_LFLAG; 838 t->c_oflag = TTYDEF_OFLAG; 839 t->c_ispeed = TTYDEF_SPEED; 840 t->c_ospeed = TTYDEF_SPEED; 841 memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars); 842 843 tp->t_termios_init_out = *t; 844} 845 846void 847tty_init_console(struct tty *tp, speed_t s) 848{ 849 struct termios *ti = &tp->t_termios_init_in; 850 struct termios *to = &tp->t_termios_init_out; 851 852 if (s != 0) { 853 ti->c_ispeed = ti->c_ospeed = s; 854 to->c_ispeed = to->c_ospeed = s; 855 } 856 857 ti->c_cflag |= CLOCAL; 858 to->c_cflag |= CLOCAL; 859} 860 861/* 862 * Standard device routine implementations, mostly meant for 863 * pseudo-terminal device drivers. When a driver creates a new terminal 864 * device class, missing routines are patched. 865 */ 866 867static int 868ttydevsw_defopen(struct tty *tp) 869{ 870 871 return (0); 872} 873 874static void 875ttydevsw_defclose(struct tty *tp) 876{ 877} 878 879static void 880ttydevsw_defoutwakeup(struct tty *tp) 881{ 882 883 panic("Terminal device has output, while not implemented"); 884} 885 886static void 887ttydevsw_definwakeup(struct tty *tp) 888{ 889} 890 891static int 892ttydevsw_defioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td) 893{ 894 895 return (ENOIOCTL); 896} 897 898static int 899ttydevsw_defcioctl(struct tty *tp, int unit, u_long cmd, caddr_t data, struct thread *td) 900{ 901 902 return (ENOIOCTL); 903} 904 905static int 906ttydevsw_defparam(struct tty *tp, struct termios *t) 907{ 908 909 /* 910 * Allow the baud rate to be adjusted for pseudo-devices, but at 911 * least restrict it to 115200 to prevent excessive buffer 912 * usage. Also disallow 0, to prevent foot shooting. 913 */ 914 if (t->c_ispeed < B50) 915 t->c_ispeed = B50; 916 else if (t->c_ispeed > B115200) 917 t->c_ispeed = B115200; 918 if (t->c_ospeed < B50) 919 t->c_ospeed = B50; 920 else if (t->c_ospeed > B115200) 921 t->c_ospeed = B115200; 922 t->c_cflag |= CREAD; 923 924 return (0); 925} 926 927static int 928ttydevsw_defmodem(struct tty *tp, int sigon, int sigoff) 929{ 930 931 /* Simulate a carrier to make the TTY layer happy. */ 932 return (SER_DCD); 933} 934 935static int 936ttydevsw_defmmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t *paddr, 937 int nprot, vm_memattr_t *memattr) 938{ 939 940 return (-1); 941} 942 943static void 944ttydevsw_defpktnotify(struct tty *tp, char event) 945{ 946} 947 948static void 949ttydevsw_deffree(void *softc) 950{ 951 952 panic("Terminal device freed without a free-handler"); 953} 954 955/* 956 * TTY allocation and deallocation. TTY devices can be deallocated when 957 * the driver doesn't use it anymore, when the TTY isn't a session's 958 * controlling TTY and when the device node isn't opened through devfs. 959 */ 960 961struct tty * 962tty_alloc(struct ttydevsw *tsw, void *sc) 963{ 964 965 return (tty_alloc_mutex(tsw, sc, NULL)); 966} 967 968struct tty * 969tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex) 970{ 971 struct tty *tp; 972 973 /* Make sure the driver defines all routines. */ 974#define PATCH_FUNC(x) do { \ 975 if (tsw->tsw_ ## x == NULL) \ 976 tsw->tsw_ ## x = ttydevsw_def ## x; \ 977} while (0) 978 PATCH_FUNC(open); 979 PATCH_FUNC(close); 980 PATCH_FUNC(outwakeup); 981 PATCH_FUNC(inwakeup); 982 PATCH_FUNC(ioctl); 983 PATCH_FUNC(cioctl); 984 PATCH_FUNC(param); 985 PATCH_FUNC(modem); 986 PATCH_FUNC(mmap); 987 PATCH_FUNC(pktnotify); 988 PATCH_FUNC(free); 989#undef PATCH_FUNC 990 991 tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO); 992 tp->t_devsw = tsw; 993 tp->t_devswsoftc = sc; 994 tp->t_flags = tsw->tsw_flags; 995 996 tty_init_termios(tp); 997 998 cv_init(&tp->t_inwait, "ttyin"); 999 cv_init(&tp->t_outwait, "ttyout"); 1000 cv_init(&tp->t_outserwait, "ttyosr"); 1001 cv_init(&tp->t_bgwait, "ttybg"); 1002 cv_init(&tp->t_dcdwait, "ttydcd"); 1003 1004 /* Allow drivers to use a custom mutex to lock the TTY. */ 1005 if (mutex != NULL) { 1006 tp->t_mtx = mutex; 1007 } else { 1008 tp->t_mtx = &tp->t_mtxobj; 1009 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF); 1010 } 1011 1012 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx); 1013 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx); 1014 1015 sx_xlock(&tty_list_sx); 1016 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 1017 tty_list_count++; 1018 sx_xunlock(&tty_list_sx); 1019 1020 return (tp); 1021} 1022 1023static void 1024tty_dealloc(void *arg) 1025{ 1026 struct tty *tp = arg; 1027 1028 sx_xlock(&tty_list_sx); 1029 TAILQ_REMOVE(&tty_list, tp, t_list); 1030 tty_list_count--; 1031 sx_xunlock(&tty_list_sx); 1032 1033 /* Make sure we haven't leaked buffers. */ 1034 MPASS(ttyinq_getsize(&tp->t_inq) == 0); 1035 MPASS(ttyoutq_getsize(&tp->t_outq) == 0); 1036 1037 seldrain(&tp->t_inpoll); 1038 seldrain(&tp->t_outpoll); 1039 knlist_destroy(&tp->t_inpoll.si_note); 1040 knlist_destroy(&tp->t_outpoll.si_note); 1041 1042 cv_destroy(&tp->t_inwait); 1043 cv_destroy(&tp->t_outwait); 1044 cv_destroy(&tp->t_bgwait); 1045 cv_destroy(&tp->t_dcdwait); 1046 cv_destroy(&tp->t_outserwait); 1047 1048 if (tp->t_mtx == &tp->t_mtxobj) 1049 mtx_destroy(&tp->t_mtxobj); 1050 ttydevsw_free(tp); 1051 free(tp, M_TTY); 1052} 1053 1054static void 1055tty_rel_free(struct tty *tp) 1056{ 1057 struct cdev *dev; 1058 1059 tty_lock_assert(tp, MA_OWNED); 1060 1061#define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE) 1062 if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) { 1063 /* TTY is still in use. */ 1064 tty_unlock(tp); 1065 return; 1066 } 1067 1068 /* TTY can be deallocated. */ 1069 dev = tp->t_dev; 1070 tp->t_dev = NULL; 1071 tty_unlock(tp); 1072 1073 if (dev != NULL) 1074 destroy_dev_sched_cb(dev, tty_dealloc, tp); 1075} 1076 1077void 1078tty_rel_pgrp(struct tty *tp, struct pgrp *pg) 1079{ 1080 MPASS(tp->t_sessioncnt > 0); 1081 tty_lock_assert(tp, MA_OWNED); 1082 1083 if (tp->t_pgrp == pg) 1084 tp->t_pgrp = NULL; 1085 1086 tty_unlock(tp); 1087} 1088 1089void 1090tty_rel_sess(struct tty *tp, struct session *sess) 1091{ 1092 MPASS(tp->t_sessioncnt > 0); 1093 1094 /* Current session has left. */ 1095 if (tp->t_session == sess) { 1096 tp->t_session = NULL; 1097 MPASS(tp->t_pgrp == NULL); 1098 } 1099 tp->t_sessioncnt--; 1100 tty_rel_free(tp); 1101} 1102 1103void 1104tty_rel_gone(struct tty *tp) 1105{ 1106 MPASS(!tty_gone(tp)); 1107 1108 /* Simulate carrier removal. */ 1109 ttydisc_modem(tp, 0); 1110 1111 /* Wake up all blocked threads. */ 1112 tty_wakeup(tp, FREAD|FWRITE); 1113 cv_broadcast(&tp->t_bgwait); 1114 cv_broadcast(&tp->t_dcdwait); 1115 1116 tp->t_flags |= TF_GONE; 1117 tty_rel_free(tp); 1118} 1119 1120/* 1121 * Exposing information about current TTY's through sysctl 1122 */ 1123 1124static void 1125tty_to_xtty(struct tty *tp, struct xtty *xt) 1126{ 1127 tty_lock_assert(tp, MA_OWNED); 1128 1129 xt->xt_size = sizeof(struct xtty); 1130 xt->xt_insize = ttyinq_getsize(&tp->t_inq); 1131 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq); 1132 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq); 1133 xt->xt_inlow = tp->t_inlow; 1134 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq); 1135 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq); 1136 xt->xt_outlow = tp->t_outlow; 1137 xt->xt_column = tp->t_column; 1138 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1139 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0; 1140 xt->xt_flags = tp->t_flags; 1141 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV; 1142} 1143 1144static int 1145sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 1146{ 1147 unsigned long lsize; 1148 struct xtty *xtlist, *xt; 1149 struct tty *tp; 1150 int error; 1151 1152 sx_slock(&tty_list_sx); 1153 lsize = tty_list_count * sizeof(struct xtty); 1154 if (lsize == 0) { 1155 sx_sunlock(&tty_list_sx); 1156 return (0); 1157 } 1158 1159 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK); 1160 1161 TAILQ_FOREACH(tp, &tty_list, t_list) { 1162 tty_lock(tp); 1163 tty_to_xtty(tp, xt); 1164 tty_unlock(tp); 1165 xt++; 1166 } 1167 sx_sunlock(&tty_list_sx); 1168 1169 error = SYSCTL_OUT(req, xtlist, lsize); 1170 free(xtlist, M_TTY); 1171 return (error); 1172} 1173 1174SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 1175 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs"); 1176 1177/* 1178 * Device node creation. Device has been set up, now we can expose it to 1179 * the user. 1180 */ 1181 1182void 1183tty_makedev(struct tty *tp, struct ucred *cred, const char *fmt, ...) 1184{ 1185 va_list ap; 1186 struct cdev *dev; 1187 const char *prefix = "tty"; 1188 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */ 1189 uid_t uid; 1190 gid_t gid; 1191 mode_t mode; 1192 1193 /* Remove "tty" prefix from devices like PTY's. */ 1194 if (tp->t_flags & TF_NOPREFIX) 1195 prefix = ""; 1196 1197 va_start(ap, fmt); 1198 vsnrprintf(name, sizeof name, 32, fmt, ap); 1199 va_end(ap); 1200 1201 if (cred == NULL) { 1202 /* System device. */ 1203 uid = UID_ROOT; 1204 gid = GID_WHEEL; 1205 mode = S_IRUSR|S_IWUSR; 1206 } else { 1207 /* User device. */ 1208 uid = cred->cr_ruid; 1209 gid = GID_TTY; 1210 mode = S_IRUSR|S_IWUSR|S_IWGRP; 1211 } 1212 1213 /* Master call-in device. */ 1214 dev = make_dev_cred(&ttydev_cdevsw, 0, cred, 1215 uid, gid, mode, "%s%s", prefix, name); 1216 dev->si_drv1 = tp; 1217 wakeup(&dev->si_drv1); 1218 tp->t_dev = dev; 1219 1220 /* Slave call-in devices. */ 1221 if (tp->t_flags & TF_INITLOCK) { 1222 dev = make_dev_cred(&ttyil_cdevsw, TTYUNIT_INIT, cred, 1223 uid, gid, mode, "%s%s.init", prefix, name); 1224 dev_depends(tp->t_dev, dev); 1225 dev->si_drv1 = tp; 1226 wakeup(&dev->si_drv1); 1227 dev->si_drv2 = &tp->t_termios_init_in; 1228 1229 dev = make_dev_cred(&ttyil_cdevsw, TTYUNIT_LOCK, cred, 1230 uid, gid, mode, "%s%s.lock", prefix, name); 1231 dev_depends(tp->t_dev, dev); 1232 dev->si_drv1 = tp; 1233 wakeup(&dev->si_drv1); 1234 dev->si_drv2 = &tp->t_termios_lock_in; 1235 } 1236 1237 /* Call-out devices. */ 1238 if (tp->t_flags & TF_CALLOUT) { 1239 dev = make_dev_cred(&ttydev_cdevsw, TTYUNIT_CALLOUT, cred, 1240 UID_UUCP, GID_DIALER, 0660, "cua%s", name); 1241 dev_depends(tp->t_dev, dev); 1242 dev->si_drv1 = tp; 1243 wakeup(&dev->si_drv1); 1244 1245 /* Slave call-out devices. */ 1246 if (tp->t_flags & TF_INITLOCK) { 1247 dev = make_dev_cred(&ttyil_cdevsw, 1248 TTYUNIT_CALLOUT | TTYUNIT_INIT, cred, 1249 UID_UUCP, GID_DIALER, 0660, "cua%s.init", name); 1250 dev_depends(tp->t_dev, dev); 1251 dev->si_drv1 = tp; 1252 wakeup(&dev->si_drv1); 1253 dev->si_drv2 = &tp->t_termios_init_out; 1254 1255 dev = make_dev_cred(&ttyil_cdevsw, 1256 TTYUNIT_CALLOUT | TTYUNIT_LOCK, cred, 1257 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", name); 1258 dev_depends(tp->t_dev, dev); 1259 dev->si_drv1 = tp; 1260 wakeup(&dev->si_drv1); 1261 dev->si_drv2 = &tp->t_termios_lock_out; 1262 } 1263 } 1264} 1265 1266/* 1267 * Signalling processes. 1268 */ 1269 1270void 1271tty_signal_sessleader(struct tty *tp, int sig) 1272{ 1273 struct proc *p; 1274 1275 tty_lock_assert(tp, MA_OWNED); 1276 MPASS(sig >= 1 && sig < NSIG); 1277 1278 /* Make signals start output again. */ 1279 tp->t_flags &= ~TF_STOPPED; 1280 1281 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) { 1282 p = tp->t_session->s_leader; 1283 PROC_LOCK(p); 1284 kern_psignal(p, sig); 1285 PROC_UNLOCK(p); 1286 } 1287} 1288 1289void 1290tty_signal_pgrp(struct tty *tp, int sig) 1291{ 1292 ksiginfo_t ksi; 1293 1294 tty_lock_assert(tp, MA_OWNED); 1295 MPASS(sig >= 1 && sig < NSIG); 1296 1297 /* Make signals start output again. */ 1298 tp->t_flags &= ~TF_STOPPED; 1299 1300 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO)) 1301 tty_info(tp); 1302 if (tp->t_pgrp != NULL) { 1303 ksiginfo_init(&ksi); 1304 ksi.ksi_signo = sig; 1305 ksi.ksi_code = SI_KERNEL; 1306 PGRP_LOCK(tp->t_pgrp); 1307 pgsignal(tp->t_pgrp, sig, 1, &ksi); 1308 PGRP_UNLOCK(tp->t_pgrp); 1309 } 1310} 1311 1312void 1313tty_wakeup(struct tty *tp, int flags) 1314{ 1315 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL) 1316 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 1317 1318 if (flags & FWRITE) { 1319 cv_broadcast(&tp->t_outwait); 1320 selwakeup(&tp->t_outpoll); 1321 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0); 1322 } 1323 if (flags & FREAD) { 1324 cv_broadcast(&tp->t_inwait); 1325 selwakeup(&tp->t_inpoll); 1326 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0); 1327 } 1328} 1329 1330int 1331tty_wait(struct tty *tp, struct cv *cv) 1332{ 1333 int error; 1334 int revokecnt = tp->t_revokecnt; 1335 1336 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1337 MPASS(!tty_gone(tp)); 1338 1339 error = cv_wait_sig(cv, tp->t_mtx); 1340 1341 /* Restart the system call when we may have been revoked. */ 1342 if (tp->t_revokecnt != revokecnt) 1343 return (ERESTART); 1344 1345 /* Bail out when the device slipped away. */ 1346 if (tty_gone(tp)) 1347 return (ENXIO); 1348 1349 return (error); 1350} 1351 1352int 1353tty_timedwait(struct tty *tp, struct cv *cv, int hz) 1354{ 1355 int error; 1356 int revokecnt = tp->t_revokecnt; 1357 1358 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1359 MPASS(!tty_gone(tp)); 1360 1361 error = cv_timedwait_sig(cv, tp->t_mtx, hz); 1362 1363 /* Restart the system call when we may have been revoked. */ 1364 if (tp->t_revokecnt != revokecnt) 1365 return (ERESTART); 1366 1367 /* Bail out when the device slipped away. */ 1368 if (tty_gone(tp)) 1369 return (ENXIO); 1370 1371 return (error); 1372} 1373 1374void 1375tty_flush(struct tty *tp, int flags) 1376{ 1377 if (flags & FWRITE) { 1378 tp->t_flags &= ~TF_HIWAT_OUT; 1379 ttyoutq_flush(&tp->t_outq); 1380 tty_wakeup(tp, FWRITE); 1381 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE); 1382 } 1383 if (flags & FREAD) { 1384 tty_hiwat_in_unblock(tp); 1385 ttyinq_flush(&tp->t_inq); 1386 ttydevsw_inwakeup(tp); 1387 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD); 1388 } 1389} 1390 1391static int 1392tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, 1393 struct thread *td) 1394{ 1395 int error; 1396 1397 switch (cmd) { 1398 /* 1399 * Modem commands. 1400 * The SER_* and TIOCM_* flags are the same, but one bit 1401 * shifted. I don't know why. 1402 */ 1403 case TIOCSDTR: 1404 ttydevsw_modem(tp, SER_DTR, 0); 1405 return (0); 1406 case TIOCCDTR: 1407 ttydevsw_modem(tp, 0, SER_DTR); 1408 return (0); 1409 case TIOCMSET: { 1410 int bits = *(int *)data; 1411 ttydevsw_modem(tp, 1412 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 1413 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1414 return (0); 1415 } 1416 case TIOCMBIS: { 1417 int bits = *(int *)data; 1418 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0); 1419 return (0); 1420 } 1421 case TIOCMBIC: { 1422 int bits = *(int *)data; 1423 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1424 return (0); 1425 } 1426 case TIOCMGET: 1427 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1); 1428 return (0); 1429 1430 case FIOASYNC: 1431 if (*(int *)data) 1432 tp->t_flags |= TF_ASYNC; 1433 else 1434 tp->t_flags &= ~TF_ASYNC; 1435 return (0); 1436 case FIONBIO: 1437 /* This device supports non-blocking operation. */ 1438 return (0); 1439 case FIONREAD: 1440 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq); 1441 return (0); 1442 case FIONWRITE: 1443 case TIOCOUTQ: 1444 *(int *)data = ttyoutq_bytesused(&tp->t_outq); 1445 return (0); 1446 case FIOSETOWN: 1447 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1448 /* Not allowed to set ownership. */ 1449 return (ENOTTY); 1450 1451 /* Temporarily unlock the TTY to set ownership. */ 1452 tty_unlock(tp); 1453 error = fsetown(*(int *)data, &tp->t_sigio); 1454 tty_lock(tp); 1455 return (error); 1456 case FIOGETOWN: 1457 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1458 /* Not allowed to set ownership. */ 1459 return (ENOTTY); 1460 1461 /* Get ownership. */ 1462 *(int *)data = fgetown(&tp->t_sigio); 1463 return (0); 1464 case TIOCGETA: 1465 /* Obtain terminal flags through tcgetattr(). */ 1466 *(struct termios*)data = tp->t_termios; 1467 return (0); 1468 case TIOCSETA: 1469 case TIOCSETAW: 1470 case TIOCSETAF: { 1471 struct termios *t = data; 1472 1473 /* 1474 * Who makes up these funny rules? According to POSIX, 1475 * input baud rate is set equal to the output baud rate 1476 * when zero. 1477 */ 1478 if (t->c_ispeed == 0) 1479 t->c_ispeed = t->c_ospeed; 1480 1481 /* Discard any unsupported bits. */ 1482 t->c_iflag &= TTYSUP_IFLAG; 1483 t->c_oflag &= TTYSUP_OFLAG; 1484 t->c_lflag &= TTYSUP_LFLAG; 1485 t->c_cflag &= TTYSUP_CFLAG; 1486 1487 /* Set terminal flags through tcsetattr(). */ 1488 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1489 error = tty_drain(tp); 1490 if (error) 1491 return (error); 1492 if (cmd == TIOCSETAF) 1493 tty_flush(tp, FREAD); 1494 } 1495 1496 /* 1497 * Only call param() when the flags really change. 1498 */ 1499 if ((t->c_cflag & CIGNORE) == 0 && 1500 (tp->t_termios.c_cflag != t->c_cflag || 1501 ((tp->t_termios.c_iflag ^ t->c_iflag) & 1502 (IXON|IXOFF|IXANY)) || 1503 tp->t_termios.c_ispeed != t->c_ispeed || 1504 tp->t_termios.c_ospeed != t->c_ospeed)) { 1505 error = ttydevsw_param(tp, t); 1506 if (error) 1507 return (error); 1508 1509 /* XXX: CLOCAL? */ 1510 1511 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE; 1512 tp->t_termios.c_ispeed = t->c_ispeed; 1513 tp->t_termios.c_ospeed = t->c_ospeed; 1514 1515 /* Baud rate has changed - update watermarks. */ 1516 tty_watermarks(tp); 1517 } 1518 1519 /* Copy new non-device driver parameters. */ 1520 tp->t_termios.c_iflag = t->c_iflag; 1521 tp->t_termios.c_oflag = t->c_oflag; 1522 tp->t_termios.c_lflag = t->c_lflag; 1523 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc); 1524 1525 ttydisc_optimize(tp); 1526 1527 if ((t->c_lflag & ICANON) == 0) { 1528 /* 1529 * When in non-canonical mode, wake up all 1530 * readers. Canonicalize any partial input. VMIN 1531 * and VTIME could also be adjusted. 1532 */ 1533 ttyinq_canonicalize(&tp->t_inq); 1534 tty_wakeup(tp, FREAD); 1535 } 1536 1537 /* 1538 * For packet mode: notify the PTY consumer that VSTOP 1539 * and VSTART may have been changed. 1540 */ 1541 if (tp->t_termios.c_iflag & IXON && 1542 tp->t_termios.c_cc[VSTOP] == CTRL('S') && 1543 tp->t_termios.c_cc[VSTART] == CTRL('Q')) 1544 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP); 1545 else 1546 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP); 1547 return (0); 1548 } 1549 case TIOCGETD: 1550 /* For compatibility - we only support TTYDISC. */ 1551 *(int *)data = TTYDISC; 1552 return (0); 1553 case TIOCGPGRP: 1554 if (!tty_is_ctty(tp, td->td_proc)) 1555 return (ENOTTY); 1556 1557 if (tp->t_pgrp != NULL) 1558 *(int *)data = tp->t_pgrp->pg_id; 1559 else 1560 *(int *)data = NO_PID; 1561 return (0); 1562 case TIOCGSID: 1563 if (!tty_is_ctty(tp, td->td_proc)) 1564 return (ENOTTY); 1565 1566 MPASS(tp->t_session); 1567 *(int *)data = tp->t_session->s_sid; 1568 return (0); 1569 case TIOCSCTTY: { 1570 struct proc *p = td->td_proc; 1571 1572 /* XXX: This looks awful. */ 1573 tty_unlock(tp); 1574 sx_xlock(&proctree_lock); 1575 tty_lock(tp); 1576 1577 if (!SESS_LEADER(p)) { 1578 /* Only the session leader may do this. */ 1579 sx_xunlock(&proctree_lock); 1580 return (EPERM); 1581 } 1582 1583 if (tp->t_session != NULL && tp->t_session == p->p_session) { 1584 /* This is already our controlling TTY. */ 1585 sx_xunlock(&proctree_lock); 1586 return (0); 1587 } 1588 1589 if (p->p_session->s_ttyp != NULL || 1590 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL && 1591 tp->t_session->s_ttyvp->v_type != VBAD)) { 1592 /* 1593 * There is already a relation between a TTY and 1594 * a session, or the caller is not the session 1595 * leader. 1596 * 1597 * Allow the TTY to be stolen when the vnode is 1598 * invalid, but the reference to the TTY is 1599 * still active. This allows immediate reuse of 1600 * TTYs of which the session leader has been 1601 * killed or the TTY revoked. 1602 */ 1603 sx_xunlock(&proctree_lock); 1604 return (EPERM); 1605 } 1606 1607 /* Connect the session to the TTY. */ 1608 tp->t_session = p->p_session; 1609 tp->t_session->s_ttyp = tp; 1610 tp->t_sessioncnt++; 1611 sx_xunlock(&proctree_lock); 1612 1613 /* Assign foreground process group. */ 1614 tp->t_pgrp = p->p_pgrp; 1615 PROC_LOCK(p); 1616 p->p_flag |= P_CONTROLT; 1617 PROC_UNLOCK(p); 1618 1619 return (0); 1620 } 1621 case TIOCSPGRP: { 1622 struct pgrp *pg; 1623 1624 /* 1625 * XXX: Temporarily unlock the TTY to locate the process 1626 * group. This code would be lot nicer if we would ever 1627 * decompose proctree_lock. 1628 */ 1629 tty_unlock(tp); 1630 sx_slock(&proctree_lock); 1631 pg = pgfind(*(int *)data); 1632 if (pg != NULL) 1633 PGRP_UNLOCK(pg); 1634 if (pg == NULL || pg->pg_session != td->td_proc->p_session) { 1635 sx_sunlock(&proctree_lock); 1636 tty_lock(tp); 1637 return (EPERM); 1638 } 1639 tty_lock(tp); 1640 1641 /* 1642 * Determine if this TTY is the controlling TTY after 1643 * relocking the TTY. 1644 */ 1645 if (!tty_is_ctty(tp, td->td_proc)) { 1646 sx_sunlock(&proctree_lock); 1647 return (ENOTTY); 1648 } 1649 tp->t_pgrp = pg; 1650 sx_sunlock(&proctree_lock); 1651 1652 /* Wake up the background process groups. */ 1653 cv_broadcast(&tp->t_bgwait); 1654 return (0); 1655 } 1656 case TIOCFLUSH: { 1657 int flags = *(int *)data; 1658 1659 if (flags == 0) 1660 flags = (FREAD|FWRITE); 1661 else 1662 flags &= (FREAD|FWRITE); 1663 tty_flush(tp, flags); 1664 return (0); 1665 } 1666 case TIOCDRAIN: 1667 /* Drain TTY output. */ 1668 return tty_drain(tp); 1669 case TIOCCONS: 1670 /* Set terminal as console TTY. */ 1671 if (*(int *)data) { 1672 error = priv_check(td, PRIV_TTY_CONSOLE); 1673 if (error) 1674 return (error); 1675 1676 /* 1677 * XXX: constty should really need to be locked! 1678 * XXX: allow disconnected constty's to be stolen! 1679 */ 1680 1681 if (constty == tp) 1682 return (0); 1683 if (constty != NULL) 1684 return (EBUSY); 1685 1686 tty_unlock(tp); 1687 constty_set(tp); 1688 tty_lock(tp); 1689 } else if (constty == tp) { 1690 constty_clear(); 1691 } 1692 return (0); 1693 case TIOCGWINSZ: 1694 /* Obtain window size. */ 1695 *(struct winsize*)data = tp->t_winsize; 1696 return (0); 1697 case TIOCSWINSZ: 1698 /* Set window size. */ 1699 if (bcmp(&tp->t_winsize, data, sizeof(struct winsize)) == 0) 1700 return (0); 1701 tp->t_winsize = *(struct winsize*)data; 1702 tty_signal_pgrp(tp, SIGWINCH); 1703 return (0); 1704 case TIOCEXCL: 1705 tp->t_flags |= TF_EXCLUDE; 1706 return (0); 1707 case TIOCNXCL: 1708 tp->t_flags &= ~TF_EXCLUDE; 1709 return (0); 1710 case TIOCSTOP: 1711 tp->t_flags |= TF_STOPPED; 1712 ttydevsw_pktnotify(tp, TIOCPKT_STOP); 1713 return (0); 1714 case TIOCSTART: 1715 tp->t_flags &= ~TF_STOPPED; 1716 ttydevsw_outwakeup(tp); 1717 ttydevsw_pktnotify(tp, TIOCPKT_START); 1718 return (0); 1719 case TIOCSTAT: 1720 tty_info(tp); 1721 return (0); 1722 case TIOCSTI: 1723 if ((fflag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI)) 1724 return (EPERM); 1725 if (!tty_is_ctty(tp, td->td_proc) && 1726 priv_check(td, PRIV_TTY_STI)) 1727 return (EACCES); 1728 ttydisc_rint(tp, *(char *)data, 0); 1729 ttydisc_rint_done(tp); 1730 return (0); 1731 } 1732 1733#ifdef COMPAT_43TTY 1734 return tty_ioctl_compat(tp, cmd, data, fflag, td); 1735#else /* !COMPAT_43TTY */ 1736 return (ENOIOCTL); 1737#endif /* COMPAT_43TTY */ 1738} 1739 1740int 1741tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, struct thread *td) 1742{ 1743 int error; 1744 1745 tty_lock_assert(tp, MA_OWNED); 1746 1747 if (tty_gone(tp)) 1748 return (ENXIO); 1749 1750 error = ttydevsw_ioctl(tp, cmd, data, td); 1751 if (error == ENOIOCTL) 1752 error = tty_generic_ioctl(tp, cmd, data, fflag, td); 1753 1754 return (error); 1755} 1756 1757dev_t 1758tty_udev(struct tty *tp) 1759{ 1760 if (tp->t_dev) 1761 return dev2udev(tp->t_dev); 1762 else 1763 return NODEV; 1764} 1765 1766int 1767tty_checkoutq(struct tty *tp) 1768{ 1769 1770 /* 256 bytes should be enough to print a log message. */ 1771 return (ttyoutq_bytesleft(&tp->t_outq) >= 256); 1772} 1773 1774void 1775tty_hiwat_in_block(struct tty *tp) 1776{ 1777 1778 if ((tp->t_flags & TF_HIWAT_IN) == 0 && 1779 tp->t_termios.c_iflag & IXOFF && 1780 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) { 1781 /* 1782 * Input flow control. Only enter the high watermark when we 1783 * can successfully store the VSTOP character. 1784 */ 1785 if (ttyoutq_write_nofrag(&tp->t_outq, 1786 &tp->t_termios.c_cc[VSTOP], 1) == 0) 1787 tp->t_flags |= TF_HIWAT_IN; 1788 } else { 1789 /* No input flow control. */ 1790 tp->t_flags |= TF_HIWAT_IN; 1791 } 1792} 1793 1794void 1795tty_hiwat_in_unblock(struct tty *tp) 1796{ 1797 1798 if (tp->t_flags & TF_HIWAT_IN && 1799 tp->t_termios.c_iflag & IXOFF && 1800 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) { 1801 /* 1802 * Input flow control. Only leave the high watermark when we 1803 * can successfully store the VSTART character. 1804 */ 1805 if (ttyoutq_write_nofrag(&tp->t_outq, 1806 &tp->t_termios.c_cc[VSTART], 1) == 0) 1807 tp->t_flags &= ~TF_HIWAT_IN; 1808 } else { 1809 /* No input flow control. */ 1810 tp->t_flags &= ~TF_HIWAT_IN; 1811 } 1812 1813 if (!tty_gone(tp)) 1814 ttydevsw_inwakeup(tp); 1815} 1816 1817/* 1818 * TTY hooks interface. 1819 */ 1820 1821static int 1822ttyhook_defrint(struct tty *tp, char c, int flags) 1823{ 1824 1825 if (ttyhook_rint_bypass(tp, &c, 1) != 1) 1826 return (-1); 1827 1828 return (0); 1829} 1830 1831int 1832ttyhook_register(struct tty **rtp, struct proc *p, int fd, 1833 struct ttyhook *th, void *softc) 1834{ 1835 struct tty *tp; 1836 struct file *fp; 1837 struct cdev *dev; 1838 struct cdevsw *cdp; 1839 struct filedesc *fdp; 1840 int error, ref; 1841 1842 /* Validate the file descriptor. */ 1843 if ((fdp = p->p_fd) == NULL) 1844 return (EBADF); 1845 1846 fp = fget_unlocked(fdp, fd); 1847 if (fp == NULL) 1848 return (EBADF); 1849 if (fp->f_ops == &badfileops) { 1850 error = EBADF; 1851 goto done1; 1852 } 1853 1854#ifdef CAPABILITIES 1855 error = cap_funwrap(fp, CAP_TTYHOOK, &fp); 1856 if (error) 1857 goto done1; 1858#endif 1859 1860 /* 1861 * Make sure the vnode is bound to a character device. 1862 * Unlocked check for the vnode type is ok there, because we 1863 * only shall prevent calling devvn_refthread on the file that 1864 * never has been opened over a character device. 1865 */ 1866 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) { 1867 error = EINVAL; 1868 goto done1; 1869 } 1870 1871 /* Make sure it is a TTY. */ 1872 cdp = devvn_refthread(fp->f_vnode, &dev, &ref); 1873 if (cdp == NULL) { 1874 error = ENXIO; 1875 goto done1; 1876 } 1877 if (dev != fp->f_data) { 1878 error = ENXIO; 1879 goto done2; 1880 } 1881 if (cdp != &ttydev_cdevsw) { 1882 error = ENOTTY; 1883 goto done2; 1884 } 1885 tp = dev->si_drv1; 1886 1887 /* Try to attach the hook to the TTY. */ 1888 error = EBUSY; 1889 tty_lock(tp); 1890 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0)); 1891 if (tp->t_flags & TF_HOOK) 1892 goto done3; 1893 1894 tp->t_flags |= TF_HOOK; 1895 tp->t_hook = th; 1896 tp->t_hooksoftc = softc; 1897 *rtp = tp; 1898 error = 0; 1899 1900 /* Maybe we can switch into bypass mode now. */ 1901 ttydisc_optimize(tp); 1902 1903 /* Silently convert rint() calls to rint_bypass() when possible. */ 1904 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass)) 1905 th->th_rint = ttyhook_defrint; 1906 1907done3: tty_unlock(tp); 1908done2: dev_relthread(dev, ref); 1909done1: fdrop(fp, curthread); 1910 return (error); 1911} 1912 1913void 1914ttyhook_unregister(struct tty *tp) 1915{ 1916 1917 tty_lock_assert(tp, MA_OWNED); 1918 MPASS(tp->t_flags & TF_HOOK); 1919 1920 /* Disconnect the hook. */ 1921 tp->t_flags &= ~TF_HOOK; 1922 tp->t_hook = NULL; 1923 1924 /* Maybe we need to leave bypass mode. */ 1925 ttydisc_optimize(tp); 1926 1927 /* Maybe deallocate the TTY as well. */ 1928 tty_rel_free(tp); 1929} 1930 1931/* 1932 * /dev/console handling. 1933 */ 1934 1935static int 1936ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 1937{ 1938 struct tty *tp; 1939 1940 /* System has no console device. */ 1941 if (dev_console_filename == NULL) 1942 return (ENXIO); 1943 1944 /* Look up corresponding TTY by device name. */ 1945 sx_slock(&tty_list_sx); 1946 TAILQ_FOREACH(tp, &tty_list, t_list) { 1947 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) { 1948 dev_console->si_drv1 = tp; 1949 break; 1950 } 1951 } 1952 sx_sunlock(&tty_list_sx); 1953 1954 /* System console has no TTY associated. */ 1955 if (dev_console->si_drv1 == NULL) 1956 return (ENXIO); 1957 1958 return (ttydev_open(dev, oflags, devtype, td)); 1959} 1960 1961static int 1962ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag) 1963{ 1964 1965 log_console(uio); 1966 1967 return (ttydev_write(dev, uio, ioflag)); 1968} 1969 1970/* 1971 * /dev/console is a little different than normal TTY's. When opened, 1972 * it determines which TTY to use. When data gets written to it, it 1973 * will be logged in the kernel message buffer. 1974 */ 1975static struct cdevsw ttyconsdev_cdevsw = { 1976 .d_version = D_VERSION, 1977 .d_open = ttyconsdev_open, 1978 .d_close = ttydev_close, 1979 .d_read = ttydev_read, 1980 .d_write = ttyconsdev_write, 1981 .d_ioctl = ttydev_ioctl, 1982 .d_kqfilter = ttydev_kqfilter, 1983 .d_poll = ttydev_poll, 1984 .d_mmap = ttydev_mmap, 1985 .d_name = "ttyconsdev", 1986 .d_flags = D_TTY, 1987}; 1988 1989static void 1990ttyconsdev_init(void *unused) 1991{ 1992 1993 dev_console = make_dev_credf(MAKEDEV_ETERNAL, &ttyconsdev_cdevsw, 0, 1994 NULL, UID_ROOT, GID_WHEEL, 0600, "console"); 1995} 1996 1997SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL); 1998 1999void 2000ttyconsdev_select(const char *name) 2001{ 2002 2003 dev_console_filename = name; 2004} 2005 2006/* 2007 * Debugging routines. 2008 */ 2009 2010#include "opt_ddb.h" 2011#ifdef DDB 2012#include <ddb/ddb.h> 2013#include <ddb/db_sym.h> 2014 2015static struct { 2016 int flag; 2017 char val; 2018} ttystates[] = { 2019#if 0 2020 { TF_NOPREFIX, 'N' }, 2021#endif 2022 { TF_INITLOCK, 'I' }, 2023 { TF_CALLOUT, 'C' }, 2024 2025 /* Keep these together -> 'Oi' and 'Oo'. */ 2026 { TF_OPENED, 'O' }, 2027 { TF_OPENED_IN, 'i' }, 2028 { TF_OPENED_OUT, 'o' }, 2029 { TF_OPENED_CONS, 'c' }, 2030 2031 { TF_GONE, 'G' }, 2032 { TF_OPENCLOSE, 'B' }, 2033 { TF_ASYNC, 'Y' }, 2034 { TF_LITERAL, 'L' }, 2035 2036 /* Keep these together -> 'Hi' and 'Ho'. */ 2037 { TF_HIWAT, 'H' }, 2038 { TF_HIWAT_IN, 'i' }, 2039 { TF_HIWAT_OUT, 'o' }, 2040 2041 { TF_STOPPED, 'S' }, 2042 { TF_EXCLUDE, 'X' }, 2043 { TF_BYPASS, 'l' }, 2044 { TF_ZOMBIE, 'Z' }, 2045 { TF_HOOK, 's' }, 2046 2047 /* Keep these together -> 'bi' and 'bo'. */ 2048 { TF_BUSY, 'b' }, 2049 { TF_BUSY_IN, 'i' }, 2050 { TF_BUSY_OUT, 'o' }, 2051 2052 { 0, '\0'}, 2053}; 2054 2055#define TTY_FLAG_BITS \ 2056 "\20\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \ 2057 "\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \ 2058 "\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK" 2059 2060#define DB_PRINTSYM(name, addr) \ 2061 db_printf("%s " #name ": ", sep); \ 2062 db_printsym((db_addr_t) addr, DB_STGY_ANY); \ 2063 db_printf("\n"); 2064 2065static void 2066_db_show_devsw(const char *sep, const struct ttydevsw *tsw) 2067{ 2068 db_printf("%sdevsw: ", sep); 2069 db_printsym((db_addr_t)tsw, DB_STGY_ANY); 2070 db_printf(" (%p)\n", tsw); 2071 DB_PRINTSYM(open, tsw->tsw_open); 2072 DB_PRINTSYM(close, tsw->tsw_close); 2073 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup); 2074 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup); 2075 DB_PRINTSYM(ioctl, tsw->tsw_ioctl); 2076 DB_PRINTSYM(param, tsw->tsw_param); 2077 DB_PRINTSYM(modem, tsw->tsw_modem); 2078 DB_PRINTSYM(mmap, tsw->tsw_mmap); 2079 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify); 2080 DB_PRINTSYM(free, tsw->tsw_free); 2081} 2082static void 2083_db_show_hooks(const char *sep, const struct ttyhook *th) 2084{ 2085 db_printf("%shook: ", sep); 2086 db_printsym((db_addr_t)th, DB_STGY_ANY); 2087 db_printf(" (%p)\n", th); 2088 if (th == NULL) 2089 return; 2090 DB_PRINTSYM(rint, th->th_rint); 2091 DB_PRINTSYM(rint_bypass, th->th_rint_bypass); 2092 DB_PRINTSYM(rint_done, th->th_rint_done); 2093 DB_PRINTSYM(rint_poll, th->th_rint_poll); 2094 DB_PRINTSYM(getc_inject, th->th_getc_inject); 2095 DB_PRINTSYM(getc_capture, th->th_getc_capture); 2096 DB_PRINTSYM(getc_poll, th->th_getc_poll); 2097 DB_PRINTSYM(close, th->th_close); 2098} 2099 2100static void 2101_db_show_termios(const char *name, const struct termios *t) 2102{ 2103 2104 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x " 2105 "lflag 0x%x ispeed %u ospeed %u\n", name, 2106 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag, 2107 t->c_ispeed, t->c_ospeed); 2108} 2109 2110/* DDB command to show TTY statistics. */ 2111DB_SHOW_COMMAND(tty, db_show_tty) 2112{ 2113 struct tty *tp; 2114 2115 if (!have_addr) { 2116 db_printf("usage: show tty <addr>\n"); 2117 return; 2118 } 2119 tp = (struct tty *)addr; 2120 2121 db_printf("0x%p: %s\n", tp, tty_devname(tp)); 2122 db_printf("\tmtx: %p\n", tp->t_mtx); 2123 db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS); 2124 db_printf("\trevokecnt: %u\n", tp->t_revokecnt); 2125 2126 /* Buffering mechanisms. */ 2127 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u " 2128 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin, 2129 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end, 2130 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota); 2131 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n", 2132 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end, 2133 tp->t_outq.to_nblocks, tp->t_outq.to_quota); 2134 db_printf("\tinlow: %zu\n", tp->t_inlow); 2135 db_printf("\toutlow: %zu\n", tp->t_outlow); 2136 _db_show_termios("\ttermios", &tp->t_termios); 2137 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n", 2138 tp->t_winsize.ws_row, tp->t_winsize.ws_col, 2139 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel); 2140 db_printf("\tcolumn: %u\n", tp->t_column); 2141 db_printf("\twritepos: %u\n", tp->t_writepos); 2142 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags); 2143 2144 /* Init/lock-state devices. */ 2145 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in); 2146 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out); 2147 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in); 2148 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out); 2149 2150 /* Hooks */ 2151 _db_show_devsw("\t", tp->t_devsw); 2152 _db_show_hooks("\t", tp->t_hook); 2153 2154 /* Process info. */ 2155 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp, 2156 tp->t_pgrp ? tp->t_pgrp->pg_id : 0, 2157 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0); 2158 db_printf("\tsession: %p", tp->t_session); 2159 if (tp->t_session != NULL) 2160 db_printf(" count %u leader %p tty %p sid %d login %s", 2161 tp->t_session->s_count, tp->t_session->s_leader, 2162 tp->t_session->s_ttyp, tp->t_session->s_sid, 2163 tp->t_session->s_login); 2164 db_printf("\n"); 2165 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt); 2166 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc); 2167 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc); 2168 db_printf("\tdev: %p\n", tp->t_dev); 2169} 2170 2171/* DDB command to list TTYs. */ 2172DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys) 2173{ 2174 struct tty *tp; 2175 size_t isiz, osiz; 2176 int i, j; 2177 2178 /* Make the output look like `pstat -t'. */ 2179 db_printf("PTR "); 2180#if defined(__LP64__) 2181 db_printf(" "); 2182#endif 2183 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW " 2184 "COL SESS PGID STATE\n"); 2185 2186 TAILQ_FOREACH(tp, &tty_list, t_list) { 2187 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE; 2188 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE; 2189 2190 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ", 2191 tp, 2192 tty_devname(tp), 2193 isiz, 2194 tp->t_inq.ti_linestart - tp->t_inq.ti_begin, 2195 tp->t_inq.ti_end - tp->t_inq.ti_linestart, 2196 isiz - tp->t_inlow, 2197 osiz, 2198 tp->t_outq.to_end - tp->t_outq.to_begin, 2199 osiz - tp->t_outlow, 2200 MIN(tp->t_column, 99999), 2201 tp->t_session ? tp->t_session->s_sid : 0, 2202 tp->t_pgrp ? tp->t_pgrp->pg_id : 0); 2203 2204 /* Flag bits. */ 2205 for (i = j = 0; ttystates[i].flag; i++) 2206 if (tp->t_flags & ttystates[i].flag) { 2207 db_printf("%c", ttystates[i].val); 2208 j++; 2209 } 2210 if (j == 0) 2211 db_printf("-"); 2212 db_printf("\n"); 2213 } 2214} 2215#endif /* DDB */ 2216