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("$FreeBSD$"); 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 output 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 while (tty_drain(tp) == ERESTART) 196 ; 197 } 198 199 ttydisc_close(tp); 200 201 /* Destroy associated buffers already. */ 202 ttyinq_free(&tp->t_inq); 203 tp->t_inlow = 0; 204 ttyoutq_free(&tp->t_outq); 205 tp->t_outlow = 0; 206 207 knlist_clear(&tp->t_inpoll.si_note, 1); 208 knlist_clear(&tp->t_outpoll.si_note, 1); 209 210 if (!tty_gone(tp)) 211 ttydevsw_close(tp); 212 213 tp->t_flags &= ~TF_OPENCLOSE; 214 cv_broadcast(&tp->t_dcdwait); 215 tty_rel_free(tp); 216} 217 218/* 219 * Operations that are exposed through the character device in /dev. 220 */ 221static int 222ttydev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 223{ 224 struct tty *tp; 225 int error = 0; 226 227 while ((tp = dev->si_drv1) == NULL) { 228 error = tsleep(&dev->si_drv1, PCATCH, "ttdrv1", 1); 229 if (error != EWOULDBLOCK) 230 return (error); 231 } 232 233 tty_lock(tp); 234 if (tty_gone(tp)) { 235 /* Device is already gone. */ 236 tty_unlock(tp); 237 return (ENXIO); 238 } 239 240 /* 241 * Block when other processes are currently opening or closing 242 * the TTY. 243 */ 244 while (tp->t_flags & TF_OPENCLOSE) { 245 error = tty_wait(tp, &tp->t_dcdwait); 246 if (error != 0) { 247 tty_unlock(tp); 248 return (error); 249 } 250 } 251 tp->t_flags |= TF_OPENCLOSE; 252 253 /* 254 * Make sure the "tty" and "cua" device cannot be opened at the 255 * same time. 256 */ 257 if (TTY_CALLOUT(tp, dev)) { 258 if (tp->t_flags & TF_OPENED_IN) { 259 error = EBUSY; 260 goto done; 261 } 262 } else { 263 if (tp->t_flags & TF_OPENED_OUT) { 264 error = EBUSY; 265 goto done; 266 } 267 } 268 269 if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) { 270 error = EBUSY; 271 goto done; 272 } 273 274 if (!tty_opened(tp)) { 275 /* Set proper termios flags. */ 276 if (TTY_CALLOUT(tp, dev)) 277 tp->t_termios = tp->t_termios_init_out; 278 else 279 tp->t_termios = tp->t_termios_init_in; 280 ttydevsw_param(tp, &tp->t_termios); 281 /* Prevent modem control on callout devices and /dev/console. */ 282 if (TTY_CALLOUT(tp, dev) || dev == dev_console) 283 tp->t_termios.c_cflag |= CLOCAL; 284 285 ttydevsw_modem(tp, SER_DTR|SER_RTS, 0); 286 287 error = ttydevsw_open(tp); 288 if (error != 0) 289 goto done; 290 291 ttydisc_open(tp); 292 tty_watermarks(tp); /* XXXGL: drops lock */ 293 } 294 295 /* Wait for Carrier Detect. */ 296 if ((oflags & O_NONBLOCK) == 0 && 297 (tp->t_termios.c_cflag & CLOCAL) == 0) { 298 while ((ttydevsw_modem(tp, 0, 0) & SER_DCD) == 0) { 299 error = tty_wait(tp, &tp->t_dcdwait); 300 if (error != 0) 301 goto done; 302 } 303 } 304 305 if (dev == dev_console) 306 tp->t_flags |= TF_OPENED_CONS; 307 else if (TTY_CALLOUT(tp, dev)) 308 tp->t_flags |= TF_OPENED_OUT; 309 else 310 tp->t_flags |= TF_OPENED_IN; 311 312done: tp->t_flags &= ~TF_OPENCLOSE; 313 cv_broadcast(&tp->t_dcdwait); 314 ttydev_leave(tp); 315 316 return (error); 317} 318 319static int 320ttydev_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 321{ 322 struct tty *tp = dev->si_drv1; 323 324 tty_lock(tp); 325 326 /* 327 * Don't actually close the device if it is being used as the 328 * console. 329 */ 330 MPASS((tp->t_flags & TF_OPENED) != TF_OPENED); 331 if (dev == dev_console) 332 tp->t_flags &= ~TF_OPENED_CONS; 333 else 334 tp->t_flags &= ~(TF_OPENED_IN|TF_OPENED_OUT); 335 336 if (tp->t_flags & TF_OPENED) { 337 tty_unlock(tp); 338 return (0); 339 } 340 341 /* 342 * This can only be called once. The callin and the callout 343 * devices cannot be opened at the same time. 344 */ 345 tp->t_flags &= ~(TF_EXCLUDE|TF_STOPPED); 346 347 /* Properly wake up threads that are stuck - revoke(). */ 348 tp->t_revokecnt++; 349 tty_wakeup(tp, FREAD|FWRITE); 350 cv_broadcast(&tp->t_bgwait); 351 cv_broadcast(&tp->t_dcdwait); 352 353 ttydev_leave(tp); 354 355 return (0); 356} 357 358static __inline int 359tty_is_ctty(struct tty *tp, struct proc *p) 360{ 361 tty_lock_assert(tp, MA_OWNED); 362 363 return (p->p_session == tp->t_session && p->p_flag & P_CONTROLT); 364} 365 366int 367tty_wait_background(struct tty *tp, struct thread *td, int sig) 368{ 369 struct proc *p = td->td_proc; 370 struct pgrp *pg; 371 ksiginfo_t ksi; 372 int error; 373 374 MPASS(sig == SIGTTIN || sig == SIGTTOU); 375 tty_lock_assert(tp, MA_OWNED); 376 377 for (;;) { 378 PROC_LOCK(p); 379 /* 380 * The process should only sleep, when: 381 * - This terminal is the controling terminal 382 * - Its process group is not the foreground process 383 * group 384 * - The parent process isn't waiting for the child to 385 * exit 386 * - the signal to send to the process isn't masked 387 */ 388 if (!tty_is_ctty(tp, p) || p->p_pgrp == tp->t_pgrp) { 389 /* Allow the action to happen. */ 390 PROC_UNLOCK(p); 391 return (0); 392 } 393 394 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, sig) || 395 SIGISMEMBER(td->td_sigmask, sig)) { 396 /* Only allow them in write()/ioctl(). */ 397 PROC_UNLOCK(p); 398 return (sig == SIGTTOU ? 0 : EIO); 399 } 400 401 pg = p->p_pgrp; 402 if (p->p_flag & P_PPWAIT || pg->pg_jobc == 0) { 403 /* Don't allow the action to happen. */ 404 PROC_UNLOCK(p); 405 return (EIO); 406 } 407 PROC_UNLOCK(p); 408 409 /* 410 * Send the signal and sleep until we're the new 411 * foreground process group. 412 */ 413 if (sig != 0) { 414 ksiginfo_init(&ksi); 415 ksi.ksi_code = SI_KERNEL; 416 ksi.ksi_signo = sig; 417 sig = 0; 418 } 419 PGRP_LOCK(pg); 420 pgsignal(pg, ksi.ksi_signo, 1, &ksi); 421 PGRP_UNLOCK(pg); 422 423 error = tty_wait(tp, &tp->t_bgwait); 424 if (error) 425 return (error); 426 } 427} 428 429static int 430ttydev_read(struct cdev *dev, struct uio *uio, int ioflag) 431{ 432 struct tty *tp = dev->si_drv1; 433 int error; 434 435 error = ttydev_enter(tp); 436 if (error) 437 goto done; 438 error = ttydisc_read(tp, uio, ioflag); 439 tty_unlock(tp); 440 441 /* 442 * The read() call should not throw an error when the device is 443 * being destroyed. Silently convert it to an EOF. 444 */ 445done: if (error == ENXIO) 446 error = 0; 447 return (error); 448} 449 450static int 451ttydev_write(struct cdev *dev, struct uio *uio, int ioflag) 452{ 453 struct tty *tp = dev->si_drv1; 454 int error; 455 456 error = ttydev_enter(tp); 457 if (error) 458 return (error); 459 460 if (tp->t_termios.c_lflag & TOSTOP) { 461 error = tty_wait_background(tp, curthread, SIGTTOU); 462 if (error) 463 goto done; 464 } 465 466 if (ioflag & IO_NDELAY && tp->t_flags & TF_BUSY_OUT) { 467 /* Allow non-blocking writes to bypass serialization. */ 468 error = ttydisc_write(tp, uio, ioflag); 469 } else { 470 /* Serialize write() calls. */ 471 while (tp->t_flags & TF_BUSY_OUT) { 472 error = tty_wait(tp, &tp->t_outserwait); 473 if (error) 474 goto done; 475 } 476 477 tp->t_flags |= TF_BUSY_OUT; 478 error = ttydisc_write(tp, uio, ioflag); 479 tp->t_flags &= ~TF_BUSY_OUT; 480 cv_signal(&tp->t_outserwait); 481 } 482 483done: tty_unlock(tp); 484 return (error); 485} 486 487static int 488ttydev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 489 struct thread *td) 490{ 491 struct tty *tp = dev->si_drv1; 492 int error; 493 494 error = ttydev_enter(tp); 495 if (error) 496 return (error); 497 498 switch (cmd) { 499 case TIOCCBRK: 500 case TIOCCONS: 501 case TIOCDRAIN: 502 case TIOCEXCL: 503 case TIOCFLUSH: 504 case TIOCNXCL: 505 case TIOCSBRK: 506 case TIOCSCTTY: 507 case TIOCSETA: 508 case TIOCSETAF: 509 case TIOCSETAW: 510 case TIOCSPGRP: 511 case TIOCSTART: 512 case TIOCSTAT: 513 case TIOCSTI: 514 case TIOCSTOP: 515 case TIOCSWINSZ: 516#if 0 517 case TIOCSDRAINWAIT: 518 case TIOCSETD: 519#endif 520#ifdef COMPAT_43TTY 521 case TIOCLBIC: 522 case TIOCLBIS: 523 case TIOCLSET: 524 case TIOCSETC: 525 case OTIOCSETD: 526 case TIOCSETN: 527 case TIOCSETP: 528 case TIOCSLTC: 529#endif /* COMPAT_43TTY */ 530 /* 531 * If the ioctl() causes the TTY to be modified, let it 532 * wait in the background. 533 */ 534 error = tty_wait_background(tp, curthread, SIGTTOU); 535 if (error) 536 goto done; 537 } 538 539 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 540 struct termios *old = &tp->t_termios; 541 struct termios *new = (struct termios *)data; 542 struct termios *lock = TTY_CALLOUT(tp, dev) ? 543 &tp->t_termios_lock_out : &tp->t_termios_lock_in; 544 int cc; 545 546 /* 547 * Lock state devices. Just overwrite the values of the 548 * commands that are currently in use. 549 */ 550 new->c_iflag = (old->c_iflag & lock->c_iflag) | 551 (new->c_iflag & ~lock->c_iflag); 552 new->c_oflag = (old->c_oflag & lock->c_oflag) | 553 (new->c_oflag & ~lock->c_oflag); 554 new->c_cflag = (old->c_cflag & lock->c_cflag) | 555 (new->c_cflag & ~lock->c_cflag); 556 new->c_lflag = (old->c_lflag & lock->c_lflag) | 557 (new->c_lflag & ~lock->c_lflag); 558 for (cc = 0; cc < NCCS; ++cc) 559 if (lock->c_cc[cc]) 560 new->c_cc[cc] = old->c_cc[cc]; 561 if (lock->c_ispeed) 562 new->c_ispeed = old->c_ispeed; 563 if (lock->c_ospeed) 564 new->c_ospeed = old->c_ospeed; 565 } 566 567 error = tty_ioctl(tp, cmd, data, fflag, td); 568done: tty_unlock(tp); 569 570 return (error); 571} 572 573static int 574ttydev_poll(struct cdev *dev, int events, struct thread *td) 575{ 576 struct tty *tp = dev->si_drv1; 577 int error, revents = 0; 578 579 error = ttydev_enter(tp); 580 if (error) 581 return ((events & (POLLIN|POLLRDNORM)) | POLLHUP); 582 583 if (events & (POLLIN|POLLRDNORM)) { 584 /* See if we can read something. */ 585 if (ttydisc_read_poll(tp) > 0) 586 revents |= events & (POLLIN|POLLRDNORM); 587 } 588 589 if (tp->t_flags & TF_ZOMBIE) { 590 /* Hangup flag on zombie state. */ 591 revents |= POLLHUP; 592 } else if (events & (POLLOUT|POLLWRNORM)) { 593 /* See if we can write something. */ 594 if (ttydisc_write_poll(tp) > 0) 595 revents |= events & (POLLOUT|POLLWRNORM); 596 } 597 598 if (revents == 0) { 599 if (events & (POLLIN|POLLRDNORM)) 600 selrecord(td, &tp->t_inpoll); 601 if (events & (POLLOUT|POLLWRNORM)) 602 selrecord(td, &tp->t_outpoll); 603 } 604 605 tty_unlock(tp); 606 607 return (revents); 608} 609 610static int 611ttydev_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 612 int nprot, vm_memattr_t *memattr) 613{ 614 struct tty *tp = dev->si_drv1; 615 int error; 616 617 /* Handle mmap() through the driver. */ 618 619 error = ttydev_enter(tp); 620 if (error) 621 return (-1); 622 error = ttydevsw_mmap(tp, offset, paddr, nprot, memattr); 623 tty_unlock(tp); 624 625 return (error); 626} 627 628/* 629 * kqueue support. 630 */ 631 632static void 633tty_kqops_read_detach(struct knote *kn) 634{ 635 struct tty *tp = kn->kn_hook; 636 637 knlist_remove(&tp->t_inpoll.si_note, kn, 0); 638} 639 640static int 641tty_kqops_read_event(struct knote *kn, long hint) 642{ 643 struct tty *tp = kn->kn_hook; 644 645 tty_lock_assert(tp, MA_OWNED); 646 647 if (tty_gone(tp) || tp->t_flags & TF_ZOMBIE) { 648 kn->kn_flags |= EV_EOF; 649 return (1); 650 } else { 651 kn->kn_data = ttydisc_read_poll(tp); 652 return (kn->kn_data > 0); 653 } 654} 655 656static void 657tty_kqops_write_detach(struct knote *kn) 658{ 659 struct tty *tp = kn->kn_hook; 660 661 knlist_remove(&tp->t_outpoll.si_note, kn, 0); 662} 663 664static int 665tty_kqops_write_event(struct knote *kn, long hint) 666{ 667 struct tty *tp = kn->kn_hook; 668 669 tty_lock_assert(tp, MA_OWNED); 670 671 if (tty_gone(tp)) { 672 kn->kn_flags |= EV_EOF; 673 return (1); 674 } else { 675 kn->kn_data = ttydisc_write_poll(tp); 676 return (kn->kn_data > 0); 677 } 678} 679 680static struct filterops tty_kqops_read = { 681 .f_isfd = 1, 682 .f_detach = tty_kqops_read_detach, 683 .f_event = tty_kqops_read_event, 684}; 685static struct filterops tty_kqops_write = { 686 .f_isfd = 1, 687 .f_detach = tty_kqops_write_detach, 688 .f_event = tty_kqops_write_event, 689}; 690 691static int 692ttydev_kqfilter(struct cdev *dev, struct knote *kn) 693{ 694 struct tty *tp = dev->si_drv1; 695 int error; 696 697 error = ttydev_enter(tp); 698 if (error) 699 return (error); 700 701 switch (kn->kn_filter) { 702 case EVFILT_READ: 703 kn->kn_hook = tp; 704 kn->kn_fop = &tty_kqops_read; 705 knlist_add(&tp->t_inpoll.si_note, kn, 1); 706 break; 707 case EVFILT_WRITE: 708 kn->kn_hook = tp; 709 kn->kn_fop = &tty_kqops_write; 710 knlist_add(&tp->t_outpoll.si_note, kn, 1); 711 break; 712 default: 713 error = EINVAL; 714 break; 715 } 716 717 tty_unlock(tp); 718 return (error); 719} 720 721static struct cdevsw ttydev_cdevsw = { 722 .d_version = D_VERSION, 723 .d_open = ttydev_open, 724 .d_close = ttydev_close, 725 .d_read = ttydev_read, 726 .d_write = ttydev_write, 727 .d_ioctl = ttydev_ioctl, 728 .d_kqfilter = ttydev_kqfilter, 729 .d_poll = ttydev_poll, 730 .d_mmap = ttydev_mmap, 731 .d_name = "ttydev", 732 .d_flags = D_TTY, 733}; 734 735/* 736 * Init/lock-state devices 737 */ 738 739static int 740ttyil_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 741{ 742 struct tty *tp; 743 int error = 0; 744 745 while ((tp = dev->si_drv1) == NULL) { 746 error = tsleep(&dev->si_drv1, PCATCH, "ttdrv1", 1); 747 if (error != EWOULDBLOCK) 748 return (error); 749 } 750 tty_lock(tp); 751 if (tty_gone(tp)) 752 error = ENODEV; 753 tty_unlock(tp); 754 755 return (error); 756} 757 758static int 759ttyil_close(struct cdev *dev, int flag, int mode, struct thread *td) 760{ 761 return (0); 762} 763 764static int 765ttyil_rdwr(struct cdev *dev, struct uio *uio, int ioflag) 766{ 767 return (ENODEV); 768} 769 770static int 771ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 772 struct thread *td) 773{ 774 struct tty *tp = dev->si_drv1; 775 int error; 776 777 tty_lock(tp); 778 if (tty_gone(tp)) { 779 error = ENODEV; 780 goto done; 781 } 782 783 error = ttydevsw_cioctl(tp, dev2unit(dev), cmd, data, td); 784 if (error != ENOIOCTL) 785 goto done; 786 error = 0; 787 788 switch (cmd) { 789 case TIOCGETA: 790 /* Obtain terminal flags through tcgetattr(). */ 791 *(struct termios*)data = *(struct termios*)dev->si_drv2; 792 break; 793 case TIOCSETA: 794 /* Set terminal flags through tcsetattr(). */ 795 error = priv_check(td, PRIV_TTY_SETA); 796 if (error) 797 break; 798 *(struct termios*)dev->si_drv2 = *(struct termios*)data; 799 break; 800 case TIOCGETD: 801 *(int *)data = TTYDISC; 802 break; 803 case TIOCGWINSZ: 804 bzero(data, sizeof(struct winsize)); 805 break; 806 default: 807 error = ENOTTY; 808 } 809 810done: tty_unlock(tp); 811 return (error); 812} 813 814static struct cdevsw ttyil_cdevsw = { 815 .d_version = D_VERSION, 816 .d_open = ttyil_open, 817 .d_close = ttyil_close, 818 .d_read = ttyil_rdwr, 819 .d_write = ttyil_rdwr, 820 .d_ioctl = ttyil_ioctl, 821 .d_name = "ttyil", 822 .d_flags = D_TTY, 823}; 824 825static void 826tty_init_termios(struct tty *tp) 827{ 828 struct termios *t = &tp->t_termios_init_in; 829 830 t->c_cflag = TTYDEF_CFLAG; 831 t->c_iflag = TTYDEF_IFLAG; 832 t->c_lflag = TTYDEF_LFLAG; 833 t->c_oflag = TTYDEF_OFLAG; 834 t->c_ispeed = TTYDEF_SPEED; 835 t->c_ospeed = TTYDEF_SPEED; 836 memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars); 837 838 tp->t_termios_init_out = *t; 839} 840 841void 842tty_init_console(struct tty *tp, speed_t s) 843{ 844 struct termios *ti = &tp->t_termios_init_in; 845 struct termios *to = &tp->t_termios_init_out; 846 847 if (s != 0) { 848 ti->c_ispeed = ti->c_ospeed = s; 849 to->c_ispeed = to->c_ospeed = s; 850 } 851 852 ti->c_cflag |= CLOCAL; 853 to->c_cflag |= CLOCAL; 854} 855 856/* 857 * Standard device routine implementations, mostly meant for 858 * pseudo-terminal device drivers. When a driver creates a new terminal 859 * device class, missing routines are patched. 860 */ 861 862static int 863ttydevsw_defopen(struct tty *tp) 864{ 865 866 return (0); 867} 868 869static void 870ttydevsw_defclose(struct tty *tp) 871{ 872} 873 874static void 875ttydevsw_defoutwakeup(struct tty *tp) 876{ 877 878 panic("Terminal device has output, while not implemented"); 879} 880 881static void 882ttydevsw_definwakeup(struct tty *tp) 883{ 884} 885 886static int 887ttydevsw_defioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td) 888{ 889 890 return (ENOIOCTL); 891} 892 893static int 894ttydevsw_defcioctl(struct tty *tp, int unit, u_long cmd, caddr_t data, struct thread *td) 895{ 896 897 return (ENOIOCTL); 898} 899 900static int 901ttydevsw_defparam(struct tty *tp, struct termios *t) 902{ 903 904 /* 905 * Allow the baud rate to be adjusted for pseudo-devices, but at 906 * least restrict it to 115200 to prevent excessive buffer 907 * usage. Also disallow 0, to prevent foot shooting. 908 */ 909 if (t->c_ispeed < B50) 910 t->c_ispeed = B50; 911 else if (t->c_ispeed > B115200) 912 t->c_ispeed = B115200; 913 if (t->c_ospeed < B50) 914 t->c_ospeed = B50; 915 else if (t->c_ospeed > B115200) 916 t->c_ospeed = B115200; 917 t->c_cflag |= CREAD; 918 919 return (0); 920} 921 922static int 923ttydevsw_defmodem(struct tty *tp, int sigon, int sigoff) 924{ 925 926 /* Simulate a carrier to make the TTY layer happy. */ 927 return (SER_DCD); 928} 929 930static int 931ttydevsw_defmmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t *paddr, 932 int nprot, vm_memattr_t *memattr) 933{ 934 935 return (-1); 936} 937 938static void 939ttydevsw_defpktnotify(struct tty *tp, char event) 940{ 941} 942 943static void 944ttydevsw_deffree(void *softc) 945{ 946 947 panic("Terminal device freed without a free-handler"); 948} 949 950/* 951 * TTY allocation and deallocation. TTY devices can be deallocated when 952 * the driver doesn't use it anymore, when the TTY isn't a session's 953 * controlling TTY and when the device node isn't opened through devfs. 954 */ 955 956struct tty * 957tty_alloc(struct ttydevsw *tsw, void *sc) 958{ 959 960 return (tty_alloc_mutex(tsw, sc, NULL)); 961} 962 963struct tty * 964tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex) 965{ 966 struct tty *tp; 967 968 /* Make sure the driver defines all routines. */ 969#define PATCH_FUNC(x) do { \ 970 if (tsw->tsw_ ## x == NULL) \ 971 tsw->tsw_ ## x = ttydevsw_def ## x; \ 972} while (0) 973 PATCH_FUNC(open); 974 PATCH_FUNC(close); 975 PATCH_FUNC(outwakeup); 976 PATCH_FUNC(inwakeup); 977 PATCH_FUNC(ioctl); 978 PATCH_FUNC(cioctl); 979 PATCH_FUNC(param); 980 PATCH_FUNC(modem); 981 PATCH_FUNC(mmap); 982 PATCH_FUNC(pktnotify); 983 PATCH_FUNC(free); 984#undef PATCH_FUNC 985 986 tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO); 987 tp->t_devsw = tsw; 988 tp->t_devswsoftc = sc; 989 tp->t_flags = tsw->tsw_flags; 990 991 tty_init_termios(tp); 992 993 cv_init(&tp->t_inwait, "ttyin"); 994 cv_init(&tp->t_outwait, "ttyout"); 995 cv_init(&tp->t_outserwait, "ttyosr"); 996 cv_init(&tp->t_bgwait, "ttybg"); 997 cv_init(&tp->t_dcdwait, "ttydcd"); 998 999 /* Allow drivers to use a custom mutex to lock the TTY. */ 1000 if (mutex != NULL) { 1001 tp->t_mtx = mutex; 1002 } else { 1003 tp->t_mtx = &tp->t_mtxobj; 1004 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF); 1005 } 1006 1007 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx); 1008 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx); 1009 1010 return (tp); 1011} 1012 1013static void 1014tty_dealloc(void *arg) 1015{ 1016 struct tty *tp = arg; 1017 1018 /* Make sure we haven't leaked buffers. */ 1019 MPASS(ttyinq_getsize(&tp->t_inq) == 0); 1020 MPASS(ttyoutq_getsize(&tp->t_outq) == 0); 1021 1022 seldrain(&tp->t_inpoll); 1023 seldrain(&tp->t_outpoll); 1024 knlist_destroy(&tp->t_inpoll.si_note); 1025 knlist_destroy(&tp->t_outpoll.si_note); 1026 1027 cv_destroy(&tp->t_inwait); 1028 cv_destroy(&tp->t_outwait); 1029 cv_destroy(&tp->t_bgwait); 1030 cv_destroy(&tp->t_dcdwait); 1031 cv_destroy(&tp->t_outserwait); 1032 1033 if (tp->t_mtx == &tp->t_mtxobj) 1034 mtx_destroy(&tp->t_mtxobj); 1035 ttydevsw_free(tp); 1036 free(tp, M_TTY); 1037} 1038 1039static void 1040tty_rel_free(struct tty *tp) 1041{ 1042 struct cdev *dev; 1043 1044 tty_lock_assert(tp, MA_OWNED); 1045 1046#define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE) 1047 if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) { 1048 /* TTY is still in use. */ 1049 tty_unlock(tp); 1050 return; 1051 } 1052 1053 /* TTY can be deallocated. */ 1054 dev = tp->t_dev; 1055 tp->t_dev = NULL; 1056 tty_unlock(tp); 1057 1058 if (dev != NULL) { 1059 sx_xlock(&tty_list_sx); 1060 TAILQ_REMOVE(&tty_list, tp, t_list); 1061 tty_list_count--; 1062 sx_xunlock(&tty_list_sx); 1063 destroy_dev_sched_cb(dev, tty_dealloc, tp); 1064 } 1065} 1066 1067void 1068tty_rel_pgrp(struct tty *tp, struct pgrp *pg) 1069{ 1070 MPASS(tp->t_sessioncnt > 0); 1071 tty_lock_assert(tp, MA_OWNED); 1072 1073 if (tp->t_pgrp == pg) 1074 tp->t_pgrp = NULL; 1075 1076 tty_unlock(tp); 1077} 1078 1079void 1080tty_rel_sess(struct tty *tp, struct session *sess) 1081{ 1082 MPASS(tp->t_sessioncnt > 0); 1083 1084 /* Current session has left. */ 1085 if (tp->t_session == sess) { 1086 tp->t_session = NULL; 1087 MPASS(tp->t_pgrp == NULL); 1088 } 1089 tp->t_sessioncnt--; 1090 tty_rel_free(tp); 1091} 1092 1093void 1094tty_rel_gone(struct tty *tp) 1095{ 1096 MPASS(!tty_gone(tp)); 1097 1098 /* Simulate carrier removal. */ 1099 ttydisc_modem(tp, 0); 1100 1101 /* Wake up all blocked threads. */ 1102 tty_wakeup(tp, FREAD|FWRITE); 1103 cv_broadcast(&tp->t_bgwait); 1104 cv_broadcast(&tp->t_dcdwait); 1105 1106 tp->t_flags |= TF_GONE; 1107 tty_rel_free(tp); 1108} 1109 1110/* 1111 * Exposing information about current TTY's through sysctl 1112 */ 1113 1114static void 1115tty_to_xtty(struct tty *tp, struct xtty *xt) 1116{ 1117 tty_lock_assert(tp, MA_OWNED); 1118 1119 xt->xt_size = sizeof(struct xtty); 1120 xt->xt_insize = ttyinq_getsize(&tp->t_inq); 1121 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq); 1122 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq); 1123 xt->xt_inlow = tp->t_inlow; 1124 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq); 1125 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq); 1126 xt->xt_outlow = tp->t_outlow; 1127 xt->xt_column = tp->t_column; 1128 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1129 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0; 1130 xt->xt_flags = tp->t_flags; 1131 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV; 1132} 1133 1134static int 1135sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 1136{ 1137 unsigned long lsize; 1138 struct xtty *xtlist, *xt; 1139 struct tty *tp; 1140 int error; 1141 1142 sx_slock(&tty_list_sx); 1143 lsize = tty_list_count * sizeof(struct xtty); 1144 if (lsize == 0) { 1145 sx_sunlock(&tty_list_sx); 1146 return (0); 1147 } 1148 1149 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK); 1150 1151 TAILQ_FOREACH(tp, &tty_list, t_list) { 1152 tty_lock(tp); 1153 tty_to_xtty(tp, xt); 1154 tty_unlock(tp); 1155 xt++; 1156 } 1157 sx_sunlock(&tty_list_sx); 1158 1159 error = SYSCTL_OUT(req, xtlist, lsize); 1160 free(xtlist, M_TTY); 1161 return (error); 1162} 1163 1164SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 1165 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs"); 1166 1167/* 1168 * Device node creation. Device has been set up, now we can expose it to 1169 * the user. 1170 */ 1171 1172static int 1173tty_vmakedevf(struct tty *tp, struct ucred *cred, int flags, 1174 const char *fmt, va_list ap) 1175{ 1176 struct cdev *dev, *init, *lock, *cua, *cinit, *clock; 1177 const char *prefix = "tty"; 1178 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */ 1179 uid_t uid; 1180 gid_t gid; 1181 mode_t mode; 1182 int error; 1183 1184 /* Remove "tty" prefix from devices like PTY's. */ 1185 if (tp->t_flags & TF_NOPREFIX) 1186 prefix = ""; 1187 1188 vsnrprintf(name, sizeof name, 32, fmt, 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 flags = flags & TTYMK_CLONING ? MAKEDEV_REF : 0; 1203 flags |= MAKEDEV_CHECKNAME; 1204 1205 /* Master call-in device. */ 1206 error = make_dev_p(flags, &dev, &ttydev_cdevsw, cred, uid, gid, mode, 1207 "%s%s", prefix, name); 1208 if (error) 1209 return (error); 1210 dev->si_drv1 = tp; 1211 wakeup(&dev->si_drv1); 1212 tp->t_dev = dev; 1213 1214 init = lock = cua = cinit = clock = NULL; 1215 1216 /* Slave call-in devices. */ 1217 if (tp->t_flags & TF_INITLOCK) { 1218 error = make_dev_p(flags, &init, &ttyil_cdevsw, cred, uid, 1219 gid, mode, "%s%s.init", prefix, name); 1220 if (error) 1221 goto fail; 1222 dev_depends(dev, init); 1223 dev2unit(init) = TTYUNIT_INIT; 1224 init->si_drv1 = tp; 1225 wakeup(&init->si_drv1); 1226 init->si_drv2 = &tp->t_termios_init_in; 1227 1228 error = make_dev_p(flags, &lock, &ttyil_cdevsw, cred, uid, 1229 gid, mode, "%s%s.lock", prefix, name); 1230 if (error) 1231 goto fail; 1232 dev_depends(dev, lock); 1233 dev2unit(lock) = TTYUNIT_LOCK; 1234 lock->si_drv1 = tp; 1235 wakeup(&lock->si_drv1); 1236 lock->si_drv2 = &tp->t_termios_lock_in; 1237 } 1238 1239 /* Call-out devices. */ 1240 if (tp->t_flags & TF_CALLOUT) { 1241 error = make_dev_p(flags, &cua, &ttydev_cdevsw, cred, 1242 UID_UUCP, GID_DIALER, 0660, "cua%s", name); 1243 if (error) 1244 goto fail; 1245 dev_depends(dev, cua); 1246 dev2unit(cua) = TTYUNIT_CALLOUT; 1247 cua->si_drv1 = tp; 1248 wakeup(&cua->si_drv1); 1249 1250 /* Slave call-out devices. */ 1251 if (tp->t_flags & TF_INITLOCK) { 1252 error = make_dev_p(flags, &cinit, &ttyil_cdevsw, cred, 1253 UID_UUCP, GID_DIALER, 0660, "cua%s.init", name); 1254 if (error) 1255 goto fail; 1256 dev_depends(dev, cinit); 1257 dev2unit(cinit) = TTYUNIT_CALLOUT | TTYUNIT_INIT; 1258 cinit->si_drv1 = tp; 1259 wakeup(&cinit->si_drv1); 1260 cinit->si_drv2 = &tp->t_termios_init_out; 1261 1262 error = make_dev_p(flags, &clock, &ttyil_cdevsw, cred, 1263 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", name); 1264 if (error) 1265 goto fail; 1266 dev_depends(dev, clock); 1267 dev2unit(clock) = TTYUNIT_CALLOUT | TTYUNIT_LOCK; 1268 clock->si_drv1 = tp; 1269 wakeup(&clock->si_drv1); 1270 clock->si_drv2 = &tp->t_termios_lock_out; 1271 } 1272 } 1273 1274 sx_xlock(&tty_list_sx); 1275 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 1276 tty_list_count++; 1277 sx_xunlock(&tty_list_sx); 1278 1279 return (0); 1280 1281fail: 1282 destroy_dev(dev); 1283 if (init) 1284 destroy_dev(init); 1285 if (lock) 1286 destroy_dev(lock); 1287 if (cinit) 1288 destroy_dev(cinit); 1289 if (clock) 1290 destroy_dev(clock); 1291 1292 return (error); 1293} 1294 1295int 1296tty_makedevf(struct tty *tp, struct ucred *cred, int flags, 1297 const char *fmt, ...) 1298{ 1299 va_list ap; 1300 int error; 1301 1302 va_start(ap, fmt); 1303 error = tty_vmakedevf(tp, cred, flags, fmt, ap); 1304 va_end(ap); 1305 1306 return (error); 1307} 1308 1309void 1310tty_makedev(struct tty *tp, struct ucred *cred, const char *fmt, ...) 1311{ 1312 va_list ap; 1313 1314 va_start(ap, fmt); 1315 (void) tty_vmakedevf(tp, cred, 0, fmt, ap); 1316 va_end(ap); 1317} 1318 1319/* 1320 * Signalling processes. 1321 */ 1322 1323void 1324tty_signal_sessleader(struct tty *tp, int sig) 1325{ 1326 struct proc *p; 1327 1328 tty_lock_assert(tp, MA_OWNED); 1329 MPASS(sig >= 1 && sig < NSIG); 1330 1331 /* Make signals start output again. */ 1332 tp->t_flags &= ~TF_STOPPED; 1333 1334 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) { 1335 p = tp->t_session->s_leader; 1336 PROC_LOCK(p); 1337 kern_psignal(p, sig); 1338 PROC_UNLOCK(p); 1339 } 1340} 1341 1342void 1343tty_signal_pgrp(struct tty *tp, int sig) 1344{ 1345 ksiginfo_t ksi; 1346 1347 tty_lock_assert(tp, MA_OWNED); 1348 MPASS(sig >= 1 && sig < NSIG); 1349 1350 /* Make signals start output again. */ 1351 tp->t_flags &= ~TF_STOPPED; 1352 1353 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO)) 1354 tty_info(tp); 1355 if (tp->t_pgrp != NULL) { 1356 ksiginfo_init(&ksi); 1357 ksi.ksi_signo = sig; 1358 ksi.ksi_code = SI_KERNEL; 1359 PGRP_LOCK(tp->t_pgrp); 1360 pgsignal(tp->t_pgrp, sig, 1, &ksi); 1361 PGRP_UNLOCK(tp->t_pgrp); 1362 } 1363} 1364 1365void 1366tty_wakeup(struct tty *tp, int flags) 1367{ 1368 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL) 1369 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 1370 1371 if (flags & FWRITE) { 1372 cv_broadcast(&tp->t_outwait); 1373 selwakeup(&tp->t_outpoll); 1374 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0); 1375 } 1376 if (flags & FREAD) { 1377 cv_broadcast(&tp->t_inwait); 1378 selwakeup(&tp->t_inpoll); 1379 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0); 1380 } 1381} 1382 1383int 1384tty_wait(struct tty *tp, struct cv *cv) 1385{ 1386 int error; 1387 int revokecnt = tp->t_revokecnt; 1388 1389 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1390 MPASS(!tty_gone(tp)); 1391 1392 error = cv_wait_sig(cv, tp->t_mtx); 1393 1394 /* Restart the system call when we may have been revoked. */ 1395 if (tp->t_revokecnt != revokecnt) 1396 return (ERESTART); 1397 1398 /* Bail out when the device slipped away. */ 1399 if (tty_gone(tp)) 1400 return (ENXIO); 1401 1402 return (error); 1403} 1404 1405int 1406tty_timedwait(struct tty *tp, struct cv *cv, int hz) 1407{ 1408 int error; 1409 int revokecnt = tp->t_revokecnt; 1410 1411 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1412 MPASS(!tty_gone(tp)); 1413 1414 error = cv_timedwait_sig(cv, tp->t_mtx, hz); 1415 1416 /* Restart the system call when we may have been revoked. */ 1417 if (tp->t_revokecnt != revokecnt) 1418 return (ERESTART); 1419 1420 /* Bail out when the device slipped away. */ 1421 if (tty_gone(tp)) 1422 return (ENXIO); 1423 1424 return (error); 1425} 1426 1427void 1428tty_flush(struct tty *tp, int flags) 1429{ 1430 if (flags & FWRITE) { 1431 tp->t_flags &= ~TF_HIWAT_OUT; 1432 ttyoutq_flush(&tp->t_outq); 1433 tty_wakeup(tp, FWRITE); 1434 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE); 1435 } 1436 if (flags & FREAD) { 1437 tty_hiwat_in_unblock(tp); 1438 ttyinq_flush(&tp->t_inq); 1439 ttydevsw_inwakeup(tp); 1440 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD); 1441 } 1442} 1443 1444void 1445tty_set_winsize(struct tty *tp, const struct winsize *wsz) 1446{ 1447 1448 if (memcmp(&tp->t_winsize, wsz, sizeof(*wsz)) == 0) 1449 return; 1450 tp->t_winsize = *wsz; 1451 tty_signal_pgrp(tp, SIGWINCH); 1452} 1453 1454static int 1455tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, 1456 struct thread *td) 1457{ 1458 int error; 1459 1460 switch (cmd) { 1461 /* 1462 * Modem commands. 1463 * The SER_* and TIOCM_* flags are the same, but one bit 1464 * shifted. I don't know why. 1465 */ 1466 case TIOCSDTR: 1467 ttydevsw_modem(tp, SER_DTR, 0); 1468 return (0); 1469 case TIOCCDTR: 1470 ttydevsw_modem(tp, 0, SER_DTR); 1471 return (0); 1472 case TIOCMSET: { 1473 int bits = *(int *)data; 1474 ttydevsw_modem(tp, 1475 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 1476 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1477 return (0); 1478 } 1479 case TIOCMBIS: { 1480 int bits = *(int *)data; 1481 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0); 1482 return (0); 1483 } 1484 case TIOCMBIC: { 1485 int bits = *(int *)data; 1486 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1487 return (0); 1488 } 1489 case TIOCMGET: 1490 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1); 1491 return (0); 1492 1493 case FIOASYNC: 1494 if (*(int *)data) 1495 tp->t_flags |= TF_ASYNC; 1496 else 1497 tp->t_flags &= ~TF_ASYNC; 1498 return (0); 1499 case FIONBIO: 1500 /* This device supports non-blocking operation. */ 1501 return (0); 1502 case FIONREAD: 1503 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq); 1504 return (0); 1505 case FIONWRITE: 1506 case TIOCOUTQ: 1507 *(int *)data = ttyoutq_bytesused(&tp->t_outq); 1508 return (0); 1509 case FIOSETOWN: 1510 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1511 /* Not allowed to set ownership. */ 1512 return (ENOTTY); 1513 1514 /* Temporarily unlock the TTY to set ownership. */ 1515 tty_unlock(tp); 1516 error = fsetown(*(int *)data, &tp->t_sigio); 1517 tty_lock(tp); 1518 return (error); 1519 case FIOGETOWN: 1520 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1521 /* Not allowed to set ownership. */ 1522 return (ENOTTY); 1523 1524 /* Get ownership. */ 1525 *(int *)data = fgetown(&tp->t_sigio); 1526 return (0); 1527 case TIOCGETA: 1528 /* Obtain terminal flags through tcgetattr(). */ 1529 *(struct termios*)data = tp->t_termios; 1530 return (0); 1531 case TIOCSETA: 1532 case TIOCSETAW: 1533 case TIOCSETAF: { 1534 struct termios *t = data; 1535 1536 /* 1537 * Who makes up these funny rules? According to POSIX, 1538 * input baud rate is set equal to the output baud rate 1539 * when zero. 1540 */ 1541 if (t->c_ispeed == 0) 1542 t->c_ispeed = t->c_ospeed; 1543 1544 /* Discard any unsupported bits. */ 1545 t->c_iflag &= TTYSUP_IFLAG; 1546 t->c_oflag &= TTYSUP_OFLAG; 1547 t->c_lflag &= TTYSUP_LFLAG; 1548 t->c_cflag &= TTYSUP_CFLAG; 1549 1550 /* Set terminal flags through tcsetattr(). */ 1551 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1552 error = tty_drain(tp); 1553 if (error) 1554 return (error); 1555 if (cmd == TIOCSETAF) 1556 tty_flush(tp, FREAD); 1557 } 1558 1559 /* 1560 * Only call param() when the flags really change. 1561 */ 1562 if ((t->c_cflag & CIGNORE) == 0 && 1563 (tp->t_termios.c_cflag != t->c_cflag || 1564 ((tp->t_termios.c_iflag ^ t->c_iflag) & 1565 (IXON|IXOFF|IXANY)) || 1566 tp->t_termios.c_ispeed != t->c_ispeed || 1567 tp->t_termios.c_ospeed != t->c_ospeed)) { 1568 error = ttydevsw_param(tp, t); 1569 if (error) 1570 return (error); 1571 1572 /* XXX: CLOCAL? */ 1573 1574 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE; 1575 tp->t_termios.c_ispeed = t->c_ispeed; 1576 tp->t_termios.c_ospeed = t->c_ospeed; 1577 1578 /* Baud rate has changed - update watermarks. */ 1579 tty_watermarks(tp); 1580 } 1581 1582 /* Copy new non-device driver parameters. */ 1583 tp->t_termios.c_iflag = t->c_iflag; 1584 tp->t_termios.c_oflag = t->c_oflag; 1585 tp->t_termios.c_lflag = t->c_lflag; 1586 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc); 1587 1588 ttydisc_optimize(tp); 1589 1590 if ((t->c_lflag & ICANON) == 0) { 1591 /* 1592 * When in non-canonical mode, wake up all 1593 * readers. Canonicalize any partial input. VMIN 1594 * and VTIME could also be adjusted. 1595 */ 1596 ttyinq_canonicalize(&tp->t_inq); 1597 tty_wakeup(tp, FREAD); 1598 } 1599 1600 /* 1601 * For packet mode: notify the PTY consumer that VSTOP 1602 * and VSTART may have been changed. 1603 */ 1604 if (tp->t_termios.c_iflag & IXON && 1605 tp->t_termios.c_cc[VSTOP] == CTRL('S') && 1606 tp->t_termios.c_cc[VSTART] == CTRL('Q')) 1607 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP); 1608 else 1609 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP); 1610 return (0); 1611 } 1612 case TIOCGETD: 1613 /* For compatibility - we only support TTYDISC. */ 1614 *(int *)data = TTYDISC; 1615 return (0); 1616 case TIOCGPGRP: 1617 if (!tty_is_ctty(tp, td->td_proc)) 1618 return (ENOTTY); 1619 1620 if (tp->t_pgrp != NULL) 1621 *(int *)data = tp->t_pgrp->pg_id; 1622 else 1623 *(int *)data = NO_PID; 1624 return (0); 1625 case TIOCGSID: 1626 if (!tty_is_ctty(tp, td->td_proc)) 1627 return (ENOTTY); 1628 1629 MPASS(tp->t_session); 1630 *(int *)data = tp->t_session->s_sid; 1631 return (0); 1632 case TIOCSCTTY: { 1633 struct proc *p = td->td_proc; 1634 1635 /* XXX: This looks awful. */ 1636 tty_unlock(tp); 1637 sx_xlock(&proctree_lock); 1638 tty_lock(tp); 1639 1640 if (!SESS_LEADER(p)) { 1641 /* Only the session leader may do this. */ 1642 sx_xunlock(&proctree_lock); 1643 return (EPERM); 1644 } 1645 1646 if (tp->t_session != NULL && tp->t_session == p->p_session) { 1647 /* This is already our controlling TTY. */ 1648 sx_xunlock(&proctree_lock); 1649 return (0); 1650 } 1651 1652 if (p->p_session->s_ttyp != NULL || 1653 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL && 1654 tp->t_session->s_ttyvp->v_type != VBAD)) { 1655 /* 1656 * There is already a relation between a TTY and 1657 * a session, or the caller is not the session 1658 * leader. 1659 * 1660 * Allow the TTY to be stolen when the vnode is 1661 * invalid, but the reference to the TTY is 1662 * still active. This allows immediate reuse of 1663 * TTYs of which the session leader has been 1664 * killed or the TTY revoked. 1665 */ 1666 sx_xunlock(&proctree_lock); 1667 return (EPERM); 1668 } 1669 1670 /* Connect the session to the TTY. */ 1671 tp->t_session = p->p_session; 1672 tp->t_session->s_ttyp = tp; 1673 tp->t_sessioncnt++; 1674 sx_xunlock(&proctree_lock); 1675 1676 /* Assign foreground process group. */ 1677 tp->t_pgrp = p->p_pgrp; 1678 PROC_LOCK(p); 1679 p->p_flag |= P_CONTROLT; 1680 PROC_UNLOCK(p); 1681 1682 return (0); 1683 } 1684 case TIOCSPGRP: { 1685 struct pgrp *pg; 1686 1687 /* 1688 * XXX: Temporarily unlock the TTY to locate the process 1689 * group. This code would be lot nicer if we would ever 1690 * decompose proctree_lock. 1691 */ 1692 tty_unlock(tp); 1693 sx_slock(&proctree_lock); 1694 pg = pgfind(*(int *)data); 1695 if (pg != NULL) 1696 PGRP_UNLOCK(pg); 1697 if (pg == NULL || pg->pg_session != td->td_proc->p_session) { 1698 sx_sunlock(&proctree_lock); 1699 tty_lock(tp); 1700 return (EPERM); 1701 } 1702 tty_lock(tp); 1703 1704 /* 1705 * Determine if this TTY is the controlling TTY after 1706 * relocking the TTY. 1707 */ 1708 if (!tty_is_ctty(tp, td->td_proc)) { 1709 sx_sunlock(&proctree_lock); 1710 return (ENOTTY); 1711 } 1712 tp->t_pgrp = pg; 1713 sx_sunlock(&proctree_lock); 1714 1715 /* Wake up the background process groups. */ 1716 cv_broadcast(&tp->t_bgwait); 1717 return (0); 1718 } 1719 case TIOCFLUSH: { 1720 int flags = *(int *)data; 1721 1722 if (flags == 0) 1723 flags = (FREAD|FWRITE); 1724 else 1725 flags &= (FREAD|FWRITE); 1726 tty_flush(tp, flags); 1727 return (0); 1728 } 1729 case TIOCDRAIN: 1730 /* Drain TTY output. */ 1731 return tty_drain(tp); 1732 case TIOCCONS: 1733 /* Set terminal as console TTY. */ 1734 if (*(int *)data) { 1735 error = priv_check(td, PRIV_TTY_CONSOLE); 1736 if (error) 1737 return (error); 1738 1739 /* 1740 * XXX: constty should really need to be locked! 1741 * XXX: allow disconnected constty's to be stolen! 1742 */ 1743 1744 if (constty == tp) 1745 return (0); 1746 if (constty != NULL) 1747 return (EBUSY); 1748 1749 tty_unlock(tp); 1750 constty_set(tp); 1751 tty_lock(tp); 1752 } else if (constty == tp) { 1753 constty_clear(); 1754 } 1755 return (0); 1756 case TIOCGWINSZ: 1757 /* Obtain window size. */ 1758 *(struct winsize*)data = tp->t_winsize; 1759 return (0); 1760 case TIOCSWINSZ: 1761 /* Set window size. */ 1762 tty_set_winsize(tp, data); 1763 return (0); 1764 case TIOCEXCL: 1765 tp->t_flags |= TF_EXCLUDE; 1766 return (0); 1767 case TIOCNXCL: 1768 tp->t_flags &= ~TF_EXCLUDE; 1769 return (0); 1770 case TIOCSTOP: 1771 tp->t_flags |= TF_STOPPED; 1772 ttydevsw_pktnotify(tp, TIOCPKT_STOP); 1773 return (0); 1774 case TIOCSTART: 1775 tp->t_flags &= ~TF_STOPPED; 1776 ttydevsw_outwakeup(tp); 1777 ttydevsw_pktnotify(tp, TIOCPKT_START); 1778 return (0); 1779 case TIOCSTAT: 1780 tty_info(tp); 1781 return (0); 1782 case TIOCSTI: 1783 if ((fflag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI)) 1784 return (EPERM); 1785 if (!tty_is_ctty(tp, td->td_proc) && 1786 priv_check(td, PRIV_TTY_STI)) 1787 return (EACCES); 1788 ttydisc_rint(tp, *(char *)data, 0); 1789 ttydisc_rint_done(tp); 1790 return (0); 1791 } 1792 1793#ifdef COMPAT_43TTY 1794 return tty_ioctl_compat(tp, cmd, data, fflag, td); 1795#else /* !COMPAT_43TTY */ 1796 return (ENOIOCTL); 1797#endif /* COMPAT_43TTY */ 1798} 1799 1800int 1801tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, struct thread *td) 1802{ 1803 int error; 1804 1805 tty_lock_assert(tp, MA_OWNED); 1806 1807 if (tty_gone(tp)) 1808 return (ENXIO); 1809 1810 error = ttydevsw_ioctl(tp, cmd, data, td); 1811 if (error == ENOIOCTL) 1812 error = tty_generic_ioctl(tp, cmd, data, fflag, td); 1813 1814 return (error); 1815} 1816 1817dev_t 1818tty_udev(struct tty *tp) 1819{ 1820 if (tp->t_dev) 1821 return dev2udev(tp->t_dev); 1822 else 1823 return NODEV; 1824} 1825 1826int 1827tty_checkoutq(struct tty *tp) 1828{ 1829 1830 /* 256 bytes should be enough to print a log message. */ 1831 return (ttyoutq_bytesleft(&tp->t_outq) >= 256); 1832} 1833 1834void 1835tty_hiwat_in_block(struct tty *tp) 1836{ 1837 1838 if ((tp->t_flags & TF_HIWAT_IN) == 0 && 1839 tp->t_termios.c_iflag & IXOFF && 1840 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) { 1841 /* 1842 * Input flow control. Only enter the high watermark when we 1843 * can successfully store the VSTOP character. 1844 */ 1845 if (ttyoutq_write_nofrag(&tp->t_outq, 1846 &tp->t_termios.c_cc[VSTOP], 1) == 0) 1847 tp->t_flags |= TF_HIWAT_IN; 1848 } else { 1849 /* No input flow control. */ 1850 tp->t_flags |= TF_HIWAT_IN; 1851 } 1852} 1853 1854void 1855tty_hiwat_in_unblock(struct tty *tp) 1856{ 1857 1858 if (tp->t_flags & TF_HIWAT_IN && 1859 tp->t_termios.c_iflag & IXOFF && 1860 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) { 1861 /* 1862 * Input flow control. Only leave the high watermark when we 1863 * can successfully store the VSTART character. 1864 */ 1865 if (ttyoutq_write_nofrag(&tp->t_outq, 1866 &tp->t_termios.c_cc[VSTART], 1) == 0) 1867 tp->t_flags &= ~TF_HIWAT_IN; 1868 } else { 1869 /* No input flow control. */ 1870 tp->t_flags &= ~TF_HIWAT_IN; 1871 } 1872 1873 if (!tty_gone(tp)) 1874 ttydevsw_inwakeup(tp); 1875} 1876 1877/* 1878 * TTY hooks interface. 1879 */ 1880 1881static int 1882ttyhook_defrint(struct tty *tp, char c, int flags) 1883{ 1884 1885 if (ttyhook_rint_bypass(tp, &c, 1) != 1) 1886 return (-1); 1887 1888 return (0); 1889} 1890 1891int 1892ttyhook_register(struct tty **rtp, struct proc *p, int fd, 1893 struct ttyhook *th, void *softc) 1894{ 1895 struct tty *tp; 1896 struct file *fp; 1897 struct cdev *dev; 1898 struct cdevsw *cdp; 1899 struct filedesc *fdp; 1900 cap_rights_t rights; 1901 int error, ref; 1902 1903 /* Validate the file descriptor. */ 1904 fdp = p->p_fd; 1905 error = fget_unlocked(fdp, fd, cap_rights_init(&rights, CAP_TTYHOOK), 1906 0, &fp, NULL); 1907 if (error != 0) 1908 return (error); 1909 if (fp->f_ops == &badfileops) { 1910 error = EBADF; 1911 goto done1; 1912 } 1913 1914 /* 1915 * Make sure the vnode is bound to a character device. 1916 * Unlocked check for the vnode type is ok there, because we 1917 * only shall prevent calling devvn_refthread on the file that 1918 * never has been opened over a character device. 1919 */ 1920 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) { 1921 error = EINVAL; 1922 goto done1; 1923 } 1924 1925 /* Make sure it is a TTY. */ 1926 cdp = devvn_refthread(fp->f_vnode, &dev, &ref); 1927 if (cdp == NULL) { 1928 error = ENXIO; 1929 goto done1; 1930 } 1931 if (dev != fp->f_data) { 1932 error = ENXIO; 1933 goto done2; 1934 } 1935 if (cdp != &ttydev_cdevsw) { 1936 error = ENOTTY; 1937 goto done2; 1938 } 1939 tp = dev->si_drv1; 1940 1941 /* Try to attach the hook to the TTY. */ 1942 error = EBUSY; 1943 tty_lock(tp); 1944 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0)); 1945 if (tp->t_flags & TF_HOOK) 1946 goto done3; 1947 1948 tp->t_flags |= TF_HOOK; 1949 tp->t_hook = th; 1950 tp->t_hooksoftc = softc; 1951 *rtp = tp; 1952 error = 0; 1953 1954 /* Maybe we can switch into bypass mode now. */ 1955 ttydisc_optimize(tp); 1956 1957 /* Silently convert rint() calls to rint_bypass() when possible. */ 1958 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass)) 1959 th->th_rint = ttyhook_defrint; 1960 1961done3: tty_unlock(tp); 1962done2: dev_relthread(dev, ref); 1963done1: fdrop(fp, curthread); 1964 return (error); 1965} 1966 1967void 1968ttyhook_unregister(struct tty *tp) 1969{ 1970 1971 tty_lock_assert(tp, MA_OWNED); 1972 MPASS(tp->t_flags & TF_HOOK); 1973 1974 /* Disconnect the hook. */ 1975 tp->t_flags &= ~TF_HOOK; 1976 tp->t_hook = NULL; 1977 1978 /* Maybe we need to leave bypass mode. */ 1979 ttydisc_optimize(tp); 1980 1981 /* Maybe deallocate the TTY as well. */ 1982 tty_rel_free(tp); 1983} 1984 1985/* 1986 * /dev/console handling. 1987 */ 1988 1989static int 1990ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 1991{ 1992 struct tty *tp; 1993 1994 /* System has no console device. */ 1995 if (dev_console_filename == NULL) 1996 return (ENXIO); 1997 1998 /* Look up corresponding TTY by device name. */ 1999 sx_slock(&tty_list_sx); 2000 TAILQ_FOREACH(tp, &tty_list, t_list) { 2001 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) { 2002 dev_console->si_drv1 = tp; 2003 break; 2004 } 2005 } 2006 sx_sunlock(&tty_list_sx); 2007 2008 /* System console has no TTY associated. */ 2009 if (dev_console->si_drv1 == NULL) 2010 return (ENXIO); 2011 2012 return (ttydev_open(dev, oflags, devtype, td)); 2013} 2014 2015static int 2016ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag) 2017{ 2018 2019 log_console(uio); 2020 2021 return (ttydev_write(dev, uio, ioflag)); 2022} 2023 2024/* 2025 * /dev/console is a little different than normal TTY's. When opened, 2026 * it determines which TTY to use. When data gets written to it, it 2027 * will be logged in the kernel message buffer. 2028 */ 2029static struct cdevsw ttyconsdev_cdevsw = { 2030 .d_version = D_VERSION, 2031 .d_open = ttyconsdev_open, 2032 .d_close = ttydev_close, 2033 .d_read = ttydev_read, 2034 .d_write = ttyconsdev_write, 2035 .d_ioctl = ttydev_ioctl, 2036 .d_kqfilter = ttydev_kqfilter, 2037 .d_poll = ttydev_poll, 2038 .d_mmap = ttydev_mmap, 2039 .d_name = "ttyconsdev", 2040 .d_flags = D_TTY, 2041}; 2042 2043static void 2044ttyconsdev_init(void *unused) 2045{ 2046 2047 dev_console = make_dev_credf(MAKEDEV_ETERNAL, &ttyconsdev_cdevsw, 0, 2048 NULL, UID_ROOT, GID_WHEEL, 0600, "console"); 2049} 2050 2051SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL); 2052 2053void 2054ttyconsdev_select(const char *name) 2055{ 2056 2057 dev_console_filename = name; 2058} 2059 2060/* 2061 * Debugging routines. 2062 */ 2063 2064#include "opt_ddb.h" 2065#ifdef DDB 2066#include <ddb/ddb.h> 2067#include <ddb/db_sym.h> 2068 2069static struct { 2070 int flag; 2071 char val; 2072} ttystates[] = { 2073#if 0 2074 { TF_NOPREFIX, 'N' }, 2075#endif 2076 { TF_INITLOCK, 'I' }, 2077 { TF_CALLOUT, 'C' }, 2078 2079 /* Keep these together -> 'Oi' and 'Oo'. */ 2080 { TF_OPENED, 'O' }, 2081 { TF_OPENED_IN, 'i' }, 2082 { TF_OPENED_OUT, 'o' }, 2083 { TF_OPENED_CONS, 'c' }, 2084 2085 { TF_GONE, 'G' }, 2086 { TF_OPENCLOSE, 'B' }, 2087 { TF_ASYNC, 'Y' }, 2088 { TF_LITERAL, 'L' }, 2089 2090 /* Keep these together -> 'Hi' and 'Ho'. */ 2091 { TF_HIWAT, 'H' }, 2092 { TF_HIWAT_IN, 'i' }, 2093 { TF_HIWAT_OUT, 'o' }, 2094 2095 { TF_STOPPED, 'S' }, 2096 { TF_EXCLUDE, 'X' }, 2097 { TF_BYPASS, 'l' }, 2098 { TF_ZOMBIE, 'Z' }, 2099 { TF_HOOK, 's' }, 2100 2101 /* Keep these together -> 'bi' and 'bo'. */ 2102 { TF_BUSY, 'b' }, 2103 { TF_BUSY_IN, 'i' }, 2104 { TF_BUSY_OUT, 'o' }, 2105 2106 { 0, '\0'}, 2107}; 2108 2109#define TTY_FLAG_BITS \ 2110 "\20\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \ 2111 "\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \ 2112 "\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK" 2113 2114#define DB_PRINTSYM(name, addr) \ 2115 db_printf("%s " #name ": ", sep); \ 2116 db_printsym((db_addr_t) addr, DB_STGY_ANY); \ 2117 db_printf("\n"); 2118 2119static void 2120_db_show_devsw(const char *sep, const struct ttydevsw *tsw) 2121{ 2122 db_printf("%sdevsw: ", sep); 2123 db_printsym((db_addr_t)tsw, DB_STGY_ANY); 2124 db_printf(" (%p)\n", tsw); 2125 DB_PRINTSYM(open, tsw->tsw_open); 2126 DB_PRINTSYM(close, tsw->tsw_close); 2127 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup); 2128 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup); 2129 DB_PRINTSYM(ioctl, tsw->tsw_ioctl); 2130 DB_PRINTSYM(param, tsw->tsw_param); 2131 DB_PRINTSYM(modem, tsw->tsw_modem); 2132 DB_PRINTSYM(mmap, tsw->tsw_mmap); 2133 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify); 2134 DB_PRINTSYM(free, tsw->tsw_free); 2135} 2136static void 2137_db_show_hooks(const char *sep, const struct ttyhook *th) 2138{ 2139 db_printf("%shook: ", sep); 2140 db_printsym((db_addr_t)th, DB_STGY_ANY); 2141 db_printf(" (%p)\n", th); 2142 if (th == NULL) 2143 return; 2144 DB_PRINTSYM(rint, th->th_rint); 2145 DB_PRINTSYM(rint_bypass, th->th_rint_bypass); 2146 DB_PRINTSYM(rint_done, th->th_rint_done); 2147 DB_PRINTSYM(rint_poll, th->th_rint_poll); 2148 DB_PRINTSYM(getc_inject, th->th_getc_inject); 2149 DB_PRINTSYM(getc_capture, th->th_getc_capture); 2150 DB_PRINTSYM(getc_poll, th->th_getc_poll); 2151 DB_PRINTSYM(close, th->th_close); 2152} 2153 2154static void 2155_db_show_termios(const char *name, const struct termios *t) 2156{ 2157 2158 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x " 2159 "lflag 0x%x ispeed %u ospeed %u\n", name, 2160 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag, 2161 t->c_ispeed, t->c_ospeed); 2162} 2163 2164/* DDB command to show TTY statistics. */ 2165DB_SHOW_COMMAND(tty, db_show_tty) 2166{ 2167 struct tty *tp; 2168 2169 if (!have_addr) { 2170 db_printf("usage: show tty <addr>\n"); 2171 return; 2172 } 2173 tp = (struct tty *)addr; 2174 2175 db_printf("0x%p: %s\n", tp, tty_devname(tp)); 2176 db_printf("\tmtx: %p\n", tp->t_mtx); 2177 db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS); 2178 db_printf("\trevokecnt: %u\n", tp->t_revokecnt); 2179 2180 /* Buffering mechanisms. */ 2181 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u " 2182 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin, 2183 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end, 2184 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota); 2185 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n", 2186 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end, 2187 tp->t_outq.to_nblocks, tp->t_outq.to_quota); 2188 db_printf("\tinlow: %zu\n", tp->t_inlow); 2189 db_printf("\toutlow: %zu\n", tp->t_outlow); 2190 _db_show_termios("\ttermios", &tp->t_termios); 2191 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n", 2192 tp->t_winsize.ws_row, tp->t_winsize.ws_col, 2193 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel); 2194 db_printf("\tcolumn: %u\n", tp->t_column); 2195 db_printf("\twritepos: %u\n", tp->t_writepos); 2196 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags); 2197 2198 /* Init/lock-state devices. */ 2199 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in); 2200 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out); 2201 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in); 2202 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out); 2203 2204 /* Hooks */ 2205 _db_show_devsw("\t", tp->t_devsw); 2206 _db_show_hooks("\t", tp->t_hook); 2207 2208 /* Process info. */ 2209 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp, 2210 tp->t_pgrp ? tp->t_pgrp->pg_id : 0, 2211 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0); 2212 db_printf("\tsession: %p", tp->t_session); 2213 if (tp->t_session != NULL) 2214 db_printf(" count %u leader %p tty %p sid %d login %s", 2215 tp->t_session->s_count, tp->t_session->s_leader, 2216 tp->t_session->s_ttyp, tp->t_session->s_sid, 2217 tp->t_session->s_login); 2218 db_printf("\n"); 2219 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt); 2220 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc); 2221 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc); 2222 db_printf("\tdev: %p\n", tp->t_dev); 2223} 2224 2225/* DDB command to list TTYs. */ 2226DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys) 2227{ 2228 struct tty *tp; 2229 size_t isiz, osiz; 2230 int i, j; 2231 2232 /* Make the output look like `pstat -t'. */ 2233 db_printf("PTR "); 2234#if defined(__LP64__) 2235 db_printf(" "); 2236#endif 2237 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW " 2238 "COL SESS PGID STATE\n"); 2239 2240 TAILQ_FOREACH(tp, &tty_list, t_list) { 2241 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE; 2242 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE; 2243 2244 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ", 2245 tp, 2246 tty_devname(tp), 2247 isiz, 2248 tp->t_inq.ti_linestart - tp->t_inq.ti_begin, 2249 tp->t_inq.ti_end - tp->t_inq.ti_linestart, 2250 isiz - tp->t_inlow, 2251 osiz, 2252 tp->t_outq.to_end - tp->t_outq.to_begin, 2253 osiz - tp->t_outlow, 2254 MIN(tp->t_column, 99999), 2255 tp->t_session ? tp->t_session->s_sid : 0, 2256 tp->t_pgrp ? tp->t_pgrp->pg_id : 0); 2257 2258 /* Flag bits. */ 2259 for (i = j = 0; ttystates[i].flag; i++) 2260 if (tp->t_flags & ttystates[i].flag) { 2261 db_printf("%c", ttystates[i].val); 2262 j++; 2263 } 2264 if (j == 0) 2265 db_printf("-"); 2266 db_printf("\n"); 2267 } 2268} 2269#endif /* DDB */ 2270