tty.c revision 280258
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: stable/10/sys/kern/tty.c 280258 2015-03-19 13:37:36Z rwatson $"); 32 33#include "opt_capsicum.h" 34#include "opt_compat.h" 35 36#include <sys/param.h> 37#include <sys/capsicum.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, int leaving) 127{ 128 size_t bytesused; 129 int error, revokecnt; 130 131 if (ttyhook_hashook(tp, getc_inject)) 132 /* buffer is inaccessible */ 133 return (0); 134 135 while (ttyoutq_bytesused(&tp->t_outq) > 0) { 136 ttydevsw_outwakeup(tp); 137 /* Could be handled synchronously. */ 138 bytesused = ttyoutq_bytesused(&tp->t_outq); 139 if (bytesused == 0) 140 return (0); 141 142 /* Wait for data to be drained. */ 143 if (leaving) { 144 revokecnt = tp->t_revokecnt; 145 error = tty_timedwait(tp, &tp->t_outwait, hz); 146 switch (error) { 147 case ERESTART: 148 if (revokecnt != tp->t_revokecnt) 149 error = 0; 150 break; 151 case EWOULDBLOCK: 152 if (ttyoutq_bytesused(&tp->t_outq) < bytesused) 153 error = 0; 154 break; 155 } 156 } else 157 error = tty_wait(tp, &tp->t_outwait); 158 159 if (error) 160 return (error); 161 } 162 163 return (0); 164} 165 166/* 167 * Though ttydev_enter() and ttydev_leave() seem to be related, they 168 * don't have to be used together. ttydev_enter() is used by the cdev 169 * operations to prevent an actual operation from being processed when 170 * the TTY has been abandoned. ttydev_leave() is used by ttydev_open() 171 * and ttydev_close() to determine whether per-TTY data should be 172 * deallocated. 173 */ 174 175static __inline int 176ttydev_enter(struct tty *tp) 177{ 178 tty_lock(tp); 179 180 if (tty_gone(tp) || !tty_opened(tp)) { 181 /* Device is already gone. */ 182 tty_unlock(tp); 183 return (ENXIO); 184 } 185 186 return (0); 187} 188 189static void 190ttydev_leave(struct tty *tp) 191{ 192 tty_lock_assert(tp, MA_OWNED); 193 194 if (tty_opened(tp) || tp->t_flags & TF_OPENCLOSE) { 195 /* Device is still opened somewhere. */ 196 tty_unlock(tp); 197 return; 198 } 199 200 tp->t_flags |= TF_OPENCLOSE; 201 202 /* Stop asynchronous I/O. */ 203 funsetown(&tp->t_sigio); 204 205 /* Remove console TTY. */ 206 if (constty == tp) 207 constty_clear(); 208 209 /* Drain any output. */ 210 MPASS((tp->t_flags & TF_STOPPED) == 0); 211 if (!tty_gone(tp)) 212 tty_drain(tp, 1); 213 214 ttydisc_close(tp); 215 216 /* Destroy associated buffers already. */ 217 ttyinq_free(&tp->t_inq); 218 tp->t_inlow = 0; 219 ttyoutq_free(&tp->t_outq); 220 tp->t_outlow = 0; 221 222 knlist_clear(&tp->t_inpoll.si_note, 1); 223 knlist_clear(&tp->t_outpoll.si_note, 1); 224 225 if (!tty_gone(tp)) 226 ttydevsw_close(tp); 227 228 tp->t_flags &= ~TF_OPENCLOSE; 229 cv_broadcast(&tp->t_dcdwait); 230 tty_rel_free(tp); 231} 232 233/* 234 * Operations that are exposed through the character device in /dev. 235 */ 236static int 237ttydev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 238{ 239 struct tty *tp; 240 int error = 0; 241 242 while ((tp = dev->si_drv1) == NULL) { 243 error = tsleep(&dev->si_drv1, PCATCH, "ttdrv1", 1); 244 if (error != EWOULDBLOCK) 245 return (error); 246 } 247 248 tty_lock(tp); 249 if (tty_gone(tp)) { 250 /* Device is already gone. */ 251 tty_unlock(tp); 252 return (ENXIO); 253 } 254 255 /* 256 * Block when other processes are currently opening or closing 257 * the TTY. 258 */ 259 while (tp->t_flags & TF_OPENCLOSE) { 260 error = tty_wait(tp, &tp->t_dcdwait); 261 if (error != 0) { 262 tty_unlock(tp); 263 return (error); 264 } 265 } 266 tp->t_flags |= TF_OPENCLOSE; 267 268 /* 269 * Make sure the "tty" and "cua" device cannot be opened at the 270 * same time. 271 */ 272 if (TTY_CALLOUT(tp, dev)) { 273 if (tp->t_flags & TF_OPENED_IN) { 274 error = EBUSY; 275 goto done; 276 } 277 } else { 278 if (tp->t_flags & TF_OPENED_OUT) { 279 error = EBUSY; 280 goto done; 281 } 282 } 283 284 if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) { 285 error = EBUSY; 286 goto done; 287 } 288 289 if (!tty_opened(tp)) { 290 /* Set proper termios flags. */ 291 if (TTY_CALLOUT(tp, dev)) 292 tp->t_termios = tp->t_termios_init_out; 293 else 294 tp->t_termios = tp->t_termios_init_in; 295 ttydevsw_param(tp, &tp->t_termios); 296 /* Prevent modem control on callout devices and /dev/console. */ 297 if (TTY_CALLOUT(tp, dev) || dev == dev_console) 298 tp->t_termios.c_cflag |= CLOCAL; 299 300 ttydevsw_modem(tp, SER_DTR|SER_RTS, 0); 301 302 error = ttydevsw_open(tp); 303 if (error != 0) 304 goto done; 305 306 ttydisc_open(tp); 307 tty_watermarks(tp); /* XXXGL: drops lock */ 308 } 309 310 /* Wait for Carrier Detect. */ 311 if ((oflags & O_NONBLOCK) == 0 && 312 (tp->t_termios.c_cflag & CLOCAL) == 0) { 313 while ((ttydevsw_modem(tp, 0, 0) & SER_DCD) == 0) { 314 error = tty_wait(tp, &tp->t_dcdwait); 315 if (error != 0) 316 goto done; 317 } 318 } 319 320 if (dev == dev_console) 321 tp->t_flags |= TF_OPENED_CONS; 322 else if (TTY_CALLOUT(tp, dev)) 323 tp->t_flags |= TF_OPENED_OUT; 324 else 325 tp->t_flags |= TF_OPENED_IN; 326 327done: tp->t_flags &= ~TF_OPENCLOSE; 328 cv_broadcast(&tp->t_dcdwait); 329 ttydev_leave(tp); 330 331 return (error); 332} 333 334static int 335ttydev_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 336{ 337 struct tty *tp = dev->si_drv1; 338 339 tty_lock(tp); 340 341 /* 342 * Don't actually close the device if it is being used as the 343 * console. 344 */ 345 MPASS((tp->t_flags & TF_OPENED) != TF_OPENED); 346 if (dev == dev_console) 347 tp->t_flags &= ~TF_OPENED_CONS; 348 else 349 tp->t_flags &= ~(TF_OPENED_IN|TF_OPENED_OUT); 350 351 if (tp->t_flags & TF_OPENED) { 352 tty_unlock(tp); 353 return (0); 354 } 355 356 /* 357 * This can only be called once. The callin and the callout 358 * devices cannot be opened at the same time. 359 */ 360 tp->t_flags &= ~(TF_EXCLUDE|TF_STOPPED); 361 362 /* Properly wake up threads that are stuck - revoke(). */ 363 tp->t_revokecnt++; 364 tty_wakeup(tp, FREAD|FWRITE); 365 cv_broadcast(&tp->t_bgwait); 366 cv_broadcast(&tp->t_dcdwait); 367 368 ttydev_leave(tp); 369 370 return (0); 371} 372 373static __inline int 374tty_is_ctty(struct tty *tp, struct proc *p) 375{ 376 tty_lock_assert(tp, MA_OWNED); 377 378 return (p->p_session == tp->t_session && p->p_flag & P_CONTROLT); 379} 380 381int 382tty_wait_background(struct tty *tp, struct thread *td, int sig) 383{ 384 struct proc *p = td->td_proc; 385 struct pgrp *pg; 386 ksiginfo_t ksi; 387 int error; 388 389 MPASS(sig == SIGTTIN || sig == SIGTTOU); 390 tty_lock_assert(tp, MA_OWNED); 391 392 for (;;) { 393 PROC_LOCK(p); 394 /* 395 * The process should only sleep, when: 396 * - This terminal is the controling terminal 397 * - Its process group is not the foreground process 398 * group 399 * - The parent process isn't waiting for the child to 400 * exit 401 * - the signal to send to the process isn't masked 402 */ 403 if (!tty_is_ctty(tp, p) || p->p_pgrp == tp->t_pgrp) { 404 /* Allow the action to happen. */ 405 PROC_UNLOCK(p); 406 return (0); 407 } 408 409 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, sig) || 410 SIGISMEMBER(td->td_sigmask, sig)) { 411 /* Only allow them in write()/ioctl(). */ 412 PROC_UNLOCK(p); 413 return (sig == SIGTTOU ? 0 : EIO); 414 } 415 416 pg = p->p_pgrp; 417 if (p->p_flag & P_PPWAIT || pg->pg_jobc == 0) { 418 /* Don't allow the action to happen. */ 419 PROC_UNLOCK(p); 420 return (EIO); 421 } 422 PROC_UNLOCK(p); 423 424 /* 425 * Send the signal and sleep until we're the new 426 * foreground process group. 427 */ 428 if (sig != 0) { 429 ksiginfo_init(&ksi); 430 ksi.ksi_code = SI_KERNEL; 431 ksi.ksi_signo = sig; 432 sig = 0; 433 } 434 PGRP_LOCK(pg); 435 pgsignal(pg, ksi.ksi_signo, 1, &ksi); 436 PGRP_UNLOCK(pg); 437 438 error = tty_wait(tp, &tp->t_bgwait); 439 if (error) 440 return (error); 441 } 442} 443 444static int 445ttydev_read(struct cdev *dev, struct uio *uio, int ioflag) 446{ 447 struct tty *tp = dev->si_drv1; 448 int error; 449 450 error = ttydev_enter(tp); 451 if (error) 452 goto done; 453 error = ttydisc_read(tp, uio, ioflag); 454 tty_unlock(tp); 455 456 /* 457 * The read() call should not throw an error when the device is 458 * being destroyed. Silently convert it to an EOF. 459 */ 460done: if (error == ENXIO) 461 error = 0; 462 return (error); 463} 464 465static int 466ttydev_write(struct cdev *dev, struct uio *uio, int ioflag) 467{ 468 struct tty *tp = dev->si_drv1; 469 int error; 470 471 error = ttydev_enter(tp); 472 if (error) 473 return (error); 474 475 if (tp->t_termios.c_lflag & TOSTOP) { 476 error = tty_wait_background(tp, curthread, SIGTTOU); 477 if (error) 478 goto done; 479 } 480 481 if (ioflag & IO_NDELAY && tp->t_flags & TF_BUSY_OUT) { 482 /* Allow non-blocking writes to bypass serialization. */ 483 error = ttydisc_write(tp, uio, ioflag); 484 } else { 485 /* Serialize write() calls. */ 486 while (tp->t_flags & TF_BUSY_OUT) { 487 error = tty_wait(tp, &tp->t_outserwait); 488 if (error) 489 goto done; 490 } 491 492 tp->t_flags |= TF_BUSY_OUT; 493 error = ttydisc_write(tp, uio, ioflag); 494 tp->t_flags &= ~TF_BUSY_OUT; 495 cv_signal(&tp->t_outserwait); 496 } 497 498done: tty_unlock(tp); 499 return (error); 500} 501 502static int 503ttydev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 504 struct thread *td) 505{ 506 struct tty *tp = dev->si_drv1; 507 int error; 508 509 error = ttydev_enter(tp); 510 if (error) 511 return (error); 512 513 switch (cmd) { 514 case TIOCCBRK: 515 case TIOCCONS: 516 case TIOCDRAIN: 517 case TIOCEXCL: 518 case TIOCFLUSH: 519 case TIOCNXCL: 520 case TIOCSBRK: 521 case TIOCSCTTY: 522 case TIOCSETA: 523 case TIOCSETAF: 524 case TIOCSETAW: 525 case TIOCSPGRP: 526 case TIOCSTART: 527 case TIOCSTAT: 528 case TIOCSTI: 529 case TIOCSTOP: 530 case TIOCSWINSZ: 531#if 0 532 case TIOCSDRAINWAIT: 533 case TIOCSETD: 534#endif 535#ifdef COMPAT_43TTY 536 case TIOCLBIC: 537 case TIOCLBIS: 538 case TIOCLSET: 539 case TIOCSETC: 540 case OTIOCSETD: 541 case TIOCSETN: 542 case TIOCSETP: 543 case TIOCSLTC: 544#endif /* COMPAT_43TTY */ 545 /* 546 * If the ioctl() causes the TTY to be modified, let it 547 * wait in the background. 548 */ 549 error = tty_wait_background(tp, curthread, SIGTTOU); 550 if (error) 551 goto done; 552 } 553 554 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 555 struct termios *old = &tp->t_termios; 556 struct termios *new = (struct termios *)data; 557 struct termios *lock = TTY_CALLOUT(tp, dev) ? 558 &tp->t_termios_lock_out : &tp->t_termios_lock_in; 559 int cc; 560 561 /* 562 * Lock state devices. Just overwrite the values of the 563 * commands that are currently in use. 564 */ 565 new->c_iflag = (old->c_iflag & lock->c_iflag) | 566 (new->c_iflag & ~lock->c_iflag); 567 new->c_oflag = (old->c_oflag & lock->c_oflag) | 568 (new->c_oflag & ~lock->c_oflag); 569 new->c_cflag = (old->c_cflag & lock->c_cflag) | 570 (new->c_cflag & ~lock->c_cflag); 571 new->c_lflag = (old->c_lflag & lock->c_lflag) | 572 (new->c_lflag & ~lock->c_lflag); 573 for (cc = 0; cc < NCCS; ++cc) 574 if (lock->c_cc[cc]) 575 new->c_cc[cc] = old->c_cc[cc]; 576 if (lock->c_ispeed) 577 new->c_ispeed = old->c_ispeed; 578 if (lock->c_ospeed) 579 new->c_ospeed = old->c_ospeed; 580 } 581 582 error = tty_ioctl(tp, cmd, data, fflag, td); 583done: tty_unlock(tp); 584 585 return (error); 586} 587 588static int 589ttydev_poll(struct cdev *dev, int events, struct thread *td) 590{ 591 struct tty *tp = dev->si_drv1; 592 int error, revents = 0; 593 594 error = ttydev_enter(tp); 595 if (error) 596 return ((events & (POLLIN|POLLRDNORM)) | POLLHUP); 597 598 if (events & (POLLIN|POLLRDNORM)) { 599 /* See if we can read something. */ 600 if (ttydisc_read_poll(tp) > 0) 601 revents |= events & (POLLIN|POLLRDNORM); 602 } 603 604 if (tp->t_flags & TF_ZOMBIE) { 605 /* Hangup flag on zombie state. */ 606 revents |= POLLHUP; 607 } else if (events & (POLLOUT|POLLWRNORM)) { 608 /* See if we can write something. */ 609 if (ttydisc_write_poll(tp) > 0) 610 revents |= events & (POLLOUT|POLLWRNORM); 611 } 612 613 if (revents == 0) { 614 if (events & (POLLIN|POLLRDNORM)) 615 selrecord(td, &tp->t_inpoll); 616 if (events & (POLLOUT|POLLWRNORM)) 617 selrecord(td, &tp->t_outpoll); 618 } 619 620 tty_unlock(tp); 621 622 return (revents); 623} 624 625static int 626ttydev_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 627 int nprot, vm_memattr_t *memattr) 628{ 629 struct tty *tp = dev->si_drv1; 630 int error; 631 632 /* Handle mmap() through the driver. */ 633 634 error = ttydev_enter(tp); 635 if (error) 636 return (-1); 637 error = ttydevsw_mmap(tp, offset, paddr, nprot, memattr); 638 tty_unlock(tp); 639 640 return (error); 641} 642 643/* 644 * kqueue support. 645 */ 646 647static void 648tty_kqops_read_detach(struct knote *kn) 649{ 650 struct tty *tp = kn->kn_hook; 651 652 knlist_remove(&tp->t_inpoll.si_note, kn, 0); 653} 654 655static int 656tty_kqops_read_event(struct knote *kn, long hint) 657{ 658 struct tty *tp = kn->kn_hook; 659 660 tty_lock_assert(tp, MA_OWNED); 661 662 if (tty_gone(tp) || tp->t_flags & TF_ZOMBIE) { 663 kn->kn_flags |= EV_EOF; 664 return (1); 665 } else { 666 kn->kn_data = ttydisc_read_poll(tp); 667 return (kn->kn_data > 0); 668 } 669} 670 671static void 672tty_kqops_write_detach(struct knote *kn) 673{ 674 struct tty *tp = kn->kn_hook; 675 676 knlist_remove(&tp->t_outpoll.si_note, kn, 0); 677} 678 679static int 680tty_kqops_write_event(struct knote *kn, long hint) 681{ 682 struct tty *tp = kn->kn_hook; 683 684 tty_lock_assert(tp, MA_OWNED); 685 686 if (tty_gone(tp)) { 687 kn->kn_flags |= EV_EOF; 688 return (1); 689 } else { 690 kn->kn_data = ttydisc_write_poll(tp); 691 return (kn->kn_data > 0); 692 } 693} 694 695static struct filterops tty_kqops_read = { 696 .f_isfd = 1, 697 .f_detach = tty_kqops_read_detach, 698 .f_event = tty_kqops_read_event, 699}; 700static struct filterops tty_kqops_write = { 701 .f_isfd = 1, 702 .f_detach = tty_kqops_write_detach, 703 .f_event = tty_kqops_write_event, 704}; 705 706static int 707ttydev_kqfilter(struct cdev *dev, struct knote *kn) 708{ 709 struct tty *tp = dev->si_drv1; 710 int error; 711 712 error = ttydev_enter(tp); 713 if (error) 714 return (error); 715 716 switch (kn->kn_filter) { 717 case EVFILT_READ: 718 kn->kn_hook = tp; 719 kn->kn_fop = &tty_kqops_read; 720 knlist_add(&tp->t_inpoll.si_note, kn, 1); 721 break; 722 case EVFILT_WRITE: 723 kn->kn_hook = tp; 724 kn->kn_fop = &tty_kqops_write; 725 knlist_add(&tp->t_outpoll.si_note, kn, 1); 726 break; 727 default: 728 error = EINVAL; 729 break; 730 } 731 732 tty_unlock(tp); 733 return (error); 734} 735 736static struct cdevsw ttydev_cdevsw = { 737 .d_version = D_VERSION, 738 .d_open = ttydev_open, 739 .d_close = ttydev_close, 740 .d_read = ttydev_read, 741 .d_write = ttydev_write, 742 .d_ioctl = ttydev_ioctl, 743 .d_kqfilter = ttydev_kqfilter, 744 .d_poll = ttydev_poll, 745 .d_mmap = ttydev_mmap, 746 .d_name = "ttydev", 747 .d_flags = D_TTY, 748}; 749 750/* 751 * Init/lock-state devices 752 */ 753 754static int 755ttyil_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 756{ 757 struct tty *tp; 758 int error = 0; 759 760 while ((tp = dev->si_drv1) == NULL) { 761 error = tsleep(&dev->si_drv1, PCATCH, "ttdrv1", 1); 762 if (error != EWOULDBLOCK) 763 return (error); 764 } 765 tty_lock(tp); 766 if (tty_gone(tp)) 767 error = ENODEV; 768 tty_unlock(tp); 769 770 return (error); 771} 772 773static int 774ttyil_close(struct cdev *dev, int flag, int mode, struct thread *td) 775{ 776 return (0); 777} 778 779static int 780ttyil_rdwr(struct cdev *dev, struct uio *uio, int ioflag) 781{ 782 return (ENODEV); 783} 784 785static int 786ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 787 struct thread *td) 788{ 789 struct tty *tp = dev->si_drv1; 790 int error; 791 792 tty_lock(tp); 793 if (tty_gone(tp)) { 794 error = ENODEV; 795 goto done; 796 } 797 798 error = ttydevsw_cioctl(tp, dev2unit(dev), cmd, data, td); 799 if (error != ENOIOCTL) 800 goto done; 801 error = 0; 802 803 switch (cmd) { 804 case TIOCGETA: 805 /* Obtain terminal flags through tcgetattr(). */ 806 *(struct termios*)data = *(struct termios*)dev->si_drv2; 807 break; 808 case TIOCSETA: 809 /* Set terminal flags through tcsetattr(). */ 810 error = priv_check(td, PRIV_TTY_SETA); 811 if (error) 812 break; 813 *(struct termios*)dev->si_drv2 = *(struct termios*)data; 814 break; 815 case TIOCGETD: 816 *(int *)data = TTYDISC; 817 break; 818 case TIOCGWINSZ: 819 bzero(data, sizeof(struct winsize)); 820 break; 821 default: 822 error = ENOTTY; 823 } 824 825done: tty_unlock(tp); 826 return (error); 827} 828 829static struct cdevsw ttyil_cdevsw = { 830 .d_version = D_VERSION, 831 .d_open = ttyil_open, 832 .d_close = ttyil_close, 833 .d_read = ttyil_rdwr, 834 .d_write = ttyil_rdwr, 835 .d_ioctl = ttyil_ioctl, 836 .d_name = "ttyil", 837 .d_flags = D_TTY, 838}; 839 840static void 841tty_init_termios(struct tty *tp) 842{ 843 struct termios *t = &tp->t_termios_init_in; 844 845 t->c_cflag = TTYDEF_CFLAG; 846 t->c_iflag = TTYDEF_IFLAG; 847 t->c_lflag = TTYDEF_LFLAG; 848 t->c_oflag = TTYDEF_OFLAG; 849 t->c_ispeed = TTYDEF_SPEED; 850 t->c_ospeed = TTYDEF_SPEED; 851 memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars); 852 853 tp->t_termios_init_out = *t; 854} 855 856void 857tty_init_console(struct tty *tp, speed_t s) 858{ 859 struct termios *ti = &tp->t_termios_init_in; 860 struct termios *to = &tp->t_termios_init_out; 861 862 if (s != 0) { 863 ti->c_ispeed = ti->c_ospeed = s; 864 to->c_ispeed = to->c_ospeed = s; 865 } 866 867 ti->c_cflag |= CLOCAL; 868 to->c_cflag |= CLOCAL; 869} 870 871/* 872 * Standard device routine implementations, mostly meant for 873 * pseudo-terminal device drivers. When a driver creates a new terminal 874 * device class, missing routines are patched. 875 */ 876 877static int 878ttydevsw_defopen(struct tty *tp) 879{ 880 881 return (0); 882} 883 884static void 885ttydevsw_defclose(struct tty *tp) 886{ 887} 888 889static void 890ttydevsw_defoutwakeup(struct tty *tp) 891{ 892 893 panic("Terminal device has output, while not implemented"); 894} 895 896static void 897ttydevsw_definwakeup(struct tty *tp) 898{ 899} 900 901static int 902ttydevsw_defioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td) 903{ 904 905 return (ENOIOCTL); 906} 907 908static int 909ttydevsw_defcioctl(struct tty *tp, int unit, u_long cmd, caddr_t data, struct thread *td) 910{ 911 912 return (ENOIOCTL); 913} 914 915static int 916ttydevsw_defparam(struct tty *tp, struct termios *t) 917{ 918 919 /* 920 * Allow the baud rate to be adjusted for pseudo-devices, but at 921 * least restrict it to 115200 to prevent excessive buffer 922 * usage. Also disallow 0, to prevent foot shooting. 923 */ 924 if (t->c_ispeed < B50) 925 t->c_ispeed = B50; 926 else if (t->c_ispeed > B115200) 927 t->c_ispeed = B115200; 928 if (t->c_ospeed < B50) 929 t->c_ospeed = B50; 930 else if (t->c_ospeed > B115200) 931 t->c_ospeed = B115200; 932 t->c_cflag |= CREAD; 933 934 return (0); 935} 936 937static int 938ttydevsw_defmodem(struct tty *tp, int sigon, int sigoff) 939{ 940 941 /* Simulate a carrier to make the TTY layer happy. */ 942 return (SER_DCD); 943} 944 945static int 946ttydevsw_defmmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t *paddr, 947 int nprot, vm_memattr_t *memattr) 948{ 949 950 return (-1); 951} 952 953static void 954ttydevsw_defpktnotify(struct tty *tp, char event) 955{ 956} 957 958static void 959ttydevsw_deffree(void *softc) 960{ 961 962 panic("Terminal device freed without a free-handler"); 963} 964 965/* 966 * TTY allocation and deallocation. TTY devices can be deallocated when 967 * the driver doesn't use it anymore, when the TTY isn't a session's 968 * controlling TTY and when the device node isn't opened through devfs. 969 */ 970 971struct tty * 972tty_alloc(struct ttydevsw *tsw, void *sc) 973{ 974 975 return (tty_alloc_mutex(tsw, sc, NULL)); 976} 977 978struct tty * 979tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex) 980{ 981 struct tty *tp; 982 983 /* Make sure the driver defines all routines. */ 984#define PATCH_FUNC(x) do { \ 985 if (tsw->tsw_ ## x == NULL) \ 986 tsw->tsw_ ## x = ttydevsw_def ## x; \ 987} while (0) 988 PATCH_FUNC(open); 989 PATCH_FUNC(close); 990 PATCH_FUNC(outwakeup); 991 PATCH_FUNC(inwakeup); 992 PATCH_FUNC(ioctl); 993 PATCH_FUNC(cioctl); 994 PATCH_FUNC(param); 995 PATCH_FUNC(modem); 996 PATCH_FUNC(mmap); 997 PATCH_FUNC(pktnotify); 998 PATCH_FUNC(free); 999#undef PATCH_FUNC 1000 1001 tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO); 1002 tp->t_devsw = tsw; 1003 tp->t_devswsoftc = sc; 1004 tp->t_flags = tsw->tsw_flags; 1005 1006 tty_init_termios(tp); 1007 1008 cv_init(&tp->t_inwait, "ttyin"); 1009 cv_init(&tp->t_outwait, "ttyout"); 1010 cv_init(&tp->t_outserwait, "ttyosr"); 1011 cv_init(&tp->t_bgwait, "ttybg"); 1012 cv_init(&tp->t_dcdwait, "ttydcd"); 1013 1014 /* Allow drivers to use a custom mutex to lock the TTY. */ 1015 if (mutex != NULL) { 1016 tp->t_mtx = mutex; 1017 } else { 1018 tp->t_mtx = &tp->t_mtxobj; 1019 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF); 1020 } 1021 1022 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx); 1023 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx); 1024 1025 return (tp); 1026} 1027 1028static void 1029tty_dealloc(void *arg) 1030{ 1031 struct tty *tp = arg; 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 sx_xlock(&tty_list_sx); 1075 TAILQ_REMOVE(&tty_list, tp, t_list); 1076 tty_list_count--; 1077 sx_xunlock(&tty_list_sx); 1078 destroy_dev_sched_cb(dev, tty_dealloc, tp); 1079 } 1080} 1081 1082void 1083tty_rel_pgrp(struct tty *tp, struct pgrp *pg) 1084{ 1085 MPASS(tp->t_sessioncnt > 0); 1086 tty_lock_assert(tp, MA_OWNED); 1087 1088 if (tp->t_pgrp == pg) 1089 tp->t_pgrp = NULL; 1090 1091 tty_unlock(tp); 1092} 1093 1094void 1095tty_rel_sess(struct tty *tp, struct session *sess) 1096{ 1097 MPASS(tp->t_sessioncnt > 0); 1098 1099 /* Current session has left. */ 1100 if (tp->t_session == sess) { 1101 tp->t_session = NULL; 1102 MPASS(tp->t_pgrp == NULL); 1103 } 1104 tp->t_sessioncnt--; 1105 tty_rel_free(tp); 1106} 1107 1108void 1109tty_rel_gone(struct tty *tp) 1110{ 1111 MPASS(!tty_gone(tp)); 1112 1113 /* Simulate carrier removal. */ 1114 ttydisc_modem(tp, 0); 1115 1116 /* Wake up all blocked threads. */ 1117 tty_wakeup(tp, FREAD|FWRITE); 1118 cv_broadcast(&tp->t_bgwait); 1119 cv_broadcast(&tp->t_dcdwait); 1120 1121 tp->t_flags |= TF_GONE; 1122 tty_rel_free(tp); 1123} 1124 1125/* 1126 * Exposing information about current TTY's through sysctl 1127 */ 1128 1129static void 1130tty_to_xtty(struct tty *tp, struct xtty *xt) 1131{ 1132 tty_lock_assert(tp, MA_OWNED); 1133 1134 xt->xt_size = sizeof(struct xtty); 1135 xt->xt_insize = ttyinq_getsize(&tp->t_inq); 1136 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq); 1137 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq); 1138 xt->xt_inlow = tp->t_inlow; 1139 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq); 1140 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq); 1141 xt->xt_outlow = tp->t_outlow; 1142 xt->xt_column = tp->t_column; 1143 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1144 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0; 1145 xt->xt_flags = tp->t_flags; 1146 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV; 1147} 1148 1149static int 1150sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 1151{ 1152 unsigned long lsize; 1153 struct xtty *xtlist, *xt; 1154 struct tty *tp; 1155 int error; 1156 1157 sx_slock(&tty_list_sx); 1158 lsize = tty_list_count * sizeof(struct xtty); 1159 if (lsize == 0) { 1160 sx_sunlock(&tty_list_sx); 1161 return (0); 1162 } 1163 1164 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK); 1165 1166 TAILQ_FOREACH(tp, &tty_list, t_list) { 1167 tty_lock(tp); 1168 tty_to_xtty(tp, xt); 1169 tty_unlock(tp); 1170 xt++; 1171 } 1172 sx_sunlock(&tty_list_sx); 1173 1174 error = SYSCTL_OUT(req, xtlist, lsize); 1175 free(xtlist, M_TTY); 1176 return (error); 1177} 1178 1179SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 1180 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs"); 1181 1182/* 1183 * Device node creation. Device has been set up, now we can expose it to 1184 * the user. 1185 */ 1186 1187static int 1188tty_vmakedevf(struct tty *tp, struct ucred *cred, int flags, 1189 const char *fmt, va_list ap) 1190{ 1191 struct cdev *dev, *init, *lock, *cua, *cinit, *clock; 1192 const char *prefix = "tty"; 1193 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */ 1194 uid_t uid; 1195 gid_t gid; 1196 mode_t mode; 1197 int error; 1198 1199 /* Remove "tty" prefix from devices like PTY's. */ 1200 if (tp->t_flags & TF_NOPREFIX) 1201 prefix = ""; 1202 1203 vsnrprintf(name, sizeof name, 32, fmt, ap); 1204 1205 if (cred == NULL) { 1206 /* System device. */ 1207 uid = UID_ROOT; 1208 gid = GID_WHEEL; 1209 mode = S_IRUSR|S_IWUSR; 1210 } else { 1211 /* User device. */ 1212 uid = cred->cr_ruid; 1213 gid = GID_TTY; 1214 mode = S_IRUSR|S_IWUSR|S_IWGRP; 1215 } 1216 1217 flags = flags & TTYMK_CLONING ? MAKEDEV_REF : 0; 1218 flags |= MAKEDEV_CHECKNAME; 1219 1220 /* Master call-in device. */ 1221 error = make_dev_p(flags, &dev, &ttydev_cdevsw, cred, uid, gid, mode, 1222 "%s%s", prefix, name); 1223 if (error) 1224 return (error); 1225 dev->si_drv1 = tp; 1226 wakeup(&dev->si_drv1); 1227 tp->t_dev = dev; 1228 1229 init = lock = cua = cinit = clock = NULL; 1230 1231 /* Slave call-in devices. */ 1232 if (tp->t_flags & TF_INITLOCK) { 1233 error = make_dev_p(flags, &init, &ttyil_cdevsw, cred, uid, 1234 gid, mode, "%s%s.init", prefix, name); 1235 if (error) 1236 goto fail; 1237 dev_depends(dev, init); 1238 dev2unit(init) = TTYUNIT_INIT; 1239 init->si_drv1 = tp; 1240 wakeup(&init->si_drv1); 1241 init->si_drv2 = &tp->t_termios_init_in; 1242 1243 error = make_dev_p(flags, &lock, &ttyil_cdevsw, cred, uid, 1244 gid, mode, "%s%s.lock", prefix, name); 1245 if (error) 1246 goto fail; 1247 dev_depends(dev, lock); 1248 dev2unit(lock) = TTYUNIT_LOCK; 1249 lock->si_drv1 = tp; 1250 wakeup(&lock->si_drv1); 1251 lock->si_drv2 = &tp->t_termios_lock_in; 1252 } 1253 1254 /* Call-out devices. */ 1255 if (tp->t_flags & TF_CALLOUT) { 1256 error = make_dev_p(flags, &cua, &ttydev_cdevsw, cred, 1257 UID_UUCP, GID_DIALER, 0660, "cua%s", name); 1258 if (error) 1259 goto fail; 1260 dev_depends(dev, cua); 1261 dev2unit(cua) = TTYUNIT_CALLOUT; 1262 cua->si_drv1 = tp; 1263 wakeup(&cua->si_drv1); 1264 1265 /* Slave call-out devices. */ 1266 if (tp->t_flags & TF_INITLOCK) { 1267 error = make_dev_p(flags, &cinit, &ttyil_cdevsw, cred, 1268 UID_UUCP, GID_DIALER, 0660, "cua%s.init", name); 1269 if (error) 1270 goto fail; 1271 dev_depends(dev, cinit); 1272 dev2unit(cinit) = TTYUNIT_CALLOUT | TTYUNIT_INIT; 1273 cinit->si_drv1 = tp; 1274 wakeup(&cinit->si_drv1); 1275 cinit->si_drv2 = &tp->t_termios_init_out; 1276 1277 error = make_dev_p(flags, &clock, &ttyil_cdevsw, cred, 1278 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", name); 1279 if (error) 1280 goto fail; 1281 dev_depends(dev, clock); 1282 dev2unit(clock) = TTYUNIT_CALLOUT | TTYUNIT_LOCK; 1283 clock->si_drv1 = tp; 1284 wakeup(&clock->si_drv1); 1285 clock->si_drv2 = &tp->t_termios_lock_out; 1286 } 1287 } 1288 1289 sx_xlock(&tty_list_sx); 1290 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 1291 tty_list_count++; 1292 sx_xunlock(&tty_list_sx); 1293 1294 return (0); 1295 1296fail: 1297 destroy_dev(dev); 1298 if (init) 1299 destroy_dev(init); 1300 if (lock) 1301 destroy_dev(lock); 1302 if (cinit) 1303 destroy_dev(cinit); 1304 if (clock) 1305 destroy_dev(clock); 1306 1307 return (error); 1308} 1309 1310int 1311tty_makedevf(struct tty *tp, struct ucred *cred, int flags, 1312 const char *fmt, ...) 1313{ 1314 va_list ap; 1315 int error; 1316 1317 va_start(ap, fmt); 1318 error = tty_vmakedevf(tp, cred, flags, fmt, ap); 1319 va_end(ap); 1320 1321 return (error); 1322} 1323 1324void 1325tty_makedev(struct tty *tp, struct ucred *cred, const char *fmt, ...) 1326{ 1327 va_list ap; 1328 1329 va_start(ap, fmt); 1330 (void) tty_vmakedevf(tp, cred, 0, fmt, ap); 1331 va_end(ap); 1332} 1333 1334/* 1335 * Signalling processes. 1336 */ 1337 1338void 1339tty_signal_sessleader(struct tty *tp, int sig) 1340{ 1341 struct proc *p; 1342 1343 tty_lock_assert(tp, MA_OWNED); 1344 MPASS(sig >= 1 && sig < NSIG); 1345 1346 /* Make signals start output again. */ 1347 tp->t_flags &= ~TF_STOPPED; 1348 1349 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) { 1350 p = tp->t_session->s_leader; 1351 PROC_LOCK(p); 1352 kern_psignal(p, sig); 1353 PROC_UNLOCK(p); 1354 } 1355} 1356 1357void 1358tty_signal_pgrp(struct tty *tp, int sig) 1359{ 1360 ksiginfo_t ksi; 1361 1362 tty_lock_assert(tp, MA_OWNED); 1363 MPASS(sig >= 1 && sig < NSIG); 1364 1365 /* Make signals start output again. */ 1366 tp->t_flags &= ~TF_STOPPED; 1367 1368 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO)) 1369 tty_info(tp); 1370 if (tp->t_pgrp != NULL) { 1371 ksiginfo_init(&ksi); 1372 ksi.ksi_signo = sig; 1373 ksi.ksi_code = SI_KERNEL; 1374 PGRP_LOCK(tp->t_pgrp); 1375 pgsignal(tp->t_pgrp, sig, 1, &ksi); 1376 PGRP_UNLOCK(tp->t_pgrp); 1377 } 1378} 1379 1380void 1381tty_wakeup(struct tty *tp, int flags) 1382{ 1383 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL) 1384 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 1385 1386 if (flags & FWRITE) { 1387 cv_broadcast(&tp->t_outwait); 1388 selwakeup(&tp->t_outpoll); 1389 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0); 1390 } 1391 if (flags & FREAD) { 1392 cv_broadcast(&tp->t_inwait); 1393 selwakeup(&tp->t_inpoll); 1394 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0); 1395 } 1396} 1397 1398int 1399tty_wait(struct tty *tp, struct cv *cv) 1400{ 1401 int error; 1402 int revokecnt = tp->t_revokecnt; 1403 1404 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1405 MPASS(!tty_gone(tp)); 1406 1407 error = cv_wait_sig(cv, tp->t_mtx); 1408 1409 /* Bail out when the device slipped away. */ 1410 if (tty_gone(tp)) 1411 return (ENXIO); 1412 1413 /* Restart the system call when we may have been revoked. */ 1414 if (tp->t_revokecnt != revokecnt) 1415 return (ERESTART); 1416 1417 return (error); 1418} 1419 1420int 1421tty_timedwait(struct tty *tp, struct cv *cv, int hz) 1422{ 1423 int error; 1424 int revokecnt = tp->t_revokecnt; 1425 1426 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1427 MPASS(!tty_gone(tp)); 1428 1429 error = cv_timedwait_sig(cv, tp->t_mtx, hz); 1430 1431 /* Bail out when the device slipped away. */ 1432 if (tty_gone(tp)) 1433 return (ENXIO); 1434 1435 /* Restart the system call when we may have been revoked. */ 1436 if (tp->t_revokecnt != revokecnt) 1437 return (ERESTART); 1438 1439 return (error); 1440} 1441 1442void 1443tty_flush(struct tty *tp, int flags) 1444{ 1445 if (flags & FWRITE) { 1446 tp->t_flags &= ~TF_HIWAT_OUT; 1447 ttyoutq_flush(&tp->t_outq); 1448 tty_wakeup(tp, FWRITE); 1449 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE); 1450 } 1451 if (flags & FREAD) { 1452 tty_hiwat_in_unblock(tp); 1453 ttyinq_flush(&tp->t_inq); 1454 ttydevsw_inwakeup(tp); 1455 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD); 1456 } 1457} 1458 1459void 1460tty_set_winsize(struct tty *tp, const struct winsize *wsz) 1461{ 1462 1463 if (memcmp(&tp->t_winsize, wsz, sizeof(*wsz)) == 0) 1464 return; 1465 tp->t_winsize = *wsz; 1466 tty_signal_pgrp(tp, SIGWINCH); 1467} 1468 1469static int 1470tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, 1471 struct thread *td) 1472{ 1473 int error; 1474 1475 switch (cmd) { 1476 /* 1477 * Modem commands. 1478 * The SER_* and TIOCM_* flags are the same, but one bit 1479 * shifted. I don't know why. 1480 */ 1481 case TIOCSDTR: 1482 ttydevsw_modem(tp, SER_DTR, 0); 1483 return (0); 1484 case TIOCCDTR: 1485 ttydevsw_modem(tp, 0, SER_DTR); 1486 return (0); 1487 case TIOCMSET: { 1488 int bits = *(int *)data; 1489 ttydevsw_modem(tp, 1490 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 1491 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1492 return (0); 1493 } 1494 case TIOCMBIS: { 1495 int bits = *(int *)data; 1496 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0); 1497 return (0); 1498 } 1499 case TIOCMBIC: { 1500 int bits = *(int *)data; 1501 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1502 return (0); 1503 } 1504 case TIOCMGET: 1505 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1); 1506 return (0); 1507 1508 case FIOASYNC: 1509 if (*(int *)data) 1510 tp->t_flags |= TF_ASYNC; 1511 else 1512 tp->t_flags &= ~TF_ASYNC; 1513 return (0); 1514 case FIONBIO: 1515 /* This device supports non-blocking operation. */ 1516 return (0); 1517 case FIONREAD: 1518 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq); 1519 return (0); 1520 case FIONWRITE: 1521 case TIOCOUTQ: 1522 *(int *)data = ttyoutq_bytesused(&tp->t_outq); 1523 return (0); 1524 case FIOSETOWN: 1525 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1526 /* Not allowed to set ownership. */ 1527 return (ENOTTY); 1528 1529 /* Temporarily unlock the TTY to set ownership. */ 1530 tty_unlock(tp); 1531 error = fsetown(*(int *)data, &tp->t_sigio); 1532 tty_lock(tp); 1533 return (error); 1534 case FIOGETOWN: 1535 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1536 /* Not allowed to set ownership. */ 1537 return (ENOTTY); 1538 1539 /* Get ownership. */ 1540 *(int *)data = fgetown(&tp->t_sigio); 1541 return (0); 1542 case TIOCGETA: 1543 /* Obtain terminal flags through tcgetattr(). */ 1544 *(struct termios*)data = tp->t_termios; 1545 return (0); 1546 case TIOCSETA: 1547 case TIOCSETAW: 1548 case TIOCSETAF: { 1549 struct termios *t = data; 1550 1551 /* 1552 * Who makes up these funny rules? According to POSIX, 1553 * input baud rate is set equal to the output baud rate 1554 * when zero. 1555 */ 1556 if (t->c_ispeed == 0) 1557 t->c_ispeed = t->c_ospeed; 1558 1559 /* Discard any unsupported bits. */ 1560 t->c_iflag &= TTYSUP_IFLAG; 1561 t->c_oflag &= TTYSUP_OFLAG; 1562 t->c_lflag &= TTYSUP_LFLAG; 1563 t->c_cflag &= TTYSUP_CFLAG; 1564 1565 /* Set terminal flags through tcsetattr(). */ 1566 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1567 error = tty_drain(tp, 0); 1568 if (error) 1569 return (error); 1570 if (cmd == TIOCSETAF) 1571 tty_flush(tp, FREAD); 1572 } 1573 1574 /* 1575 * Only call param() when the flags really change. 1576 */ 1577 if ((t->c_cflag & CIGNORE) == 0 && 1578 (tp->t_termios.c_cflag != t->c_cflag || 1579 ((tp->t_termios.c_iflag ^ t->c_iflag) & 1580 (IXON|IXOFF|IXANY)) || 1581 tp->t_termios.c_ispeed != t->c_ispeed || 1582 tp->t_termios.c_ospeed != t->c_ospeed)) { 1583 error = ttydevsw_param(tp, t); 1584 if (error) 1585 return (error); 1586 1587 /* XXX: CLOCAL? */ 1588 1589 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE; 1590 tp->t_termios.c_ispeed = t->c_ispeed; 1591 tp->t_termios.c_ospeed = t->c_ospeed; 1592 1593 /* Baud rate has changed - update watermarks. */ 1594 tty_watermarks(tp); 1595 } 1596 1597 /* Copy new non-device driver parameters. */ 1598 tp->t_termios.c_iflag = t->c_iflag; 1599 tp->t_termios.c_oflag = t->c_oflag; 1600 tp->t_termios.c_lflag = t->c_lflag; 1601 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc); 1602 1603 ttydisc_optimize(tp); 1604 1605 if ((t->c_lflag & ICANON) == 0) { 1606 /* 1607 * When in non-canonical mode, wake up all 1608 * readers. Canonicalize any partial input. VMIN 1609 * and VTIME could also be adjusted. 1610 */ 1611 ttyinq_canonicalize(&tp->t_inq); 1612 tty_wakeup(tp, FREAD); 1613 } 1614 1615 /* 1616 * For packet mode: notify the PTY consumer that VSTOP 1617 * and VSTART may have been changed. 1618 */ 1619 if (tp->t_termios.c_iflag & IXON && 1620 tp->t_termios.c_cc[VSTOP] == CTRL('S') && 1621 tp->t_termios.c_cc[VSTART] == CTRL('Q')) 1622 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP); 1623 else 1624 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP); 1625 return (0); 1626 } 1627 case TIOCGETD: 1628 /* For compatibility - we only support TTYDISC. */ 1629 *(int *)data = TTYDISC; 1630 return (0); 1631 case TIOCGPGRP: 1632 if (!tty_is_ctty(tp, td->td_proc)) 1633 return (ENOTTY); 1634 1635 if (tp->t_pgrp != NULL) 1636 *(int *)data = tp->t_pgrp->pg_id; 1637 else 1638 *(int *)data = NO_PID; 1639 return (0); 1640 case TIOCGSID: 1641 if (!tty_is_ctty(tp, td->td_proc)) 1642 return (ENOTTY); 1643 1644 MPASS(tp->t_session); 1645 *(int *)data = tp->t_session->s_sid; 1646 return (0); 1647 case TIOCSCTTY: { 1648 struct proc *p = td->td_proc; 1649 1650 /* XXX: This looks awful. */ 1651 tty_unlock(tp); 1652 sx_xlock(&proctree_lock); 1653 tty_lock(tp); 1654 1655 if (!SESS_LEADER(p)) { 1656 /* Only the session leader may do this. */ 1657 sx_xunlock(&proctree_lock); 1658 return (EPERM); 1659 } 1660 1661 if (tp->t_session != NULL && tp->t_session == p->p_session) { 1662 /* This is already our controlling TTY. */ 1663 sx_xunlock(&proctree_lock); 1664 return (0); 1665 } 1666 1667 if (p->p_session->s_ttyp != NULL || 1668 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL && 1669 tp->t_session->s_ttyvp->v_type != VBAD)) { 1670 /* 1671 * There is already a relation between a TTY and 1672 * a session, or the caller is not the session 1673 * leader. 1674 * 1675 * Allow the TTY to be stolen when the vnode is 1676 * invalid, but the reference to the TTY is 1677 * still active. This allows immediate reuse of 1678 * TTYs of which the session leader has been 1679 * killed or the TTY revoked. 1680 */ 1681 sx_xunlock(&proctree_lock); 1682 return (EPERM); 1683 } 1684 1685 /* Connect the session to the TTY. */ 1686 tp->t_session = p->p_session; 1687 tp->t_session->s_ttyp = tp; 1688 tp->t_sessioncnt++; 1689 sx_xunlock(&proctree_lock); 1690 1691 /* Assign foreground process group. */ 1692 tp->t_pgrp = p->p_pgrp; 1693 PROC_LOCK(p); 1694 p->p_flag |= P_CONTROLT; 1695 PROC_UNLOCK(p); 1696 1697 return (0); 1698 } 1699 case TIOCSPGRP: { 1700 struct pgrp *pg; 1701 1702 /* 1703 * XXX: Temporarily unlock the TTY to locate the process 1704 * group. This code would be lot nicer if we would ever 1705 * decompose proctree_lock. 1706 */ 1707 tty_unlock(tp); 1708 sx_slock(&proctree_lock); 1709 pg = pgfind(*(int *)data); 1710 if (pg != NULL) 1711 PGRP_UNLOCK(pg); 1712 if (pg == NULL || pg->pg_session != td->td_proc->p_session) { 1713 sx_sunlock(&proctree_lock); 1714 tty_lock(tp); 1715 return (EPERM); 1716 } 1717 tty_lock(tp); 1718 1719 /* 1720 * Determine if this TTY is the controlling TTY after 1721 * relocking the TTY. 1722 */ 1723 if (!tty_is_ctty(tp, td->td_proc)) { 1724 sx_sunlock(&proctree_lock); 1725 return (ENOTTY); 1726 } 1727 tp->t_pgrp = pg; 1728 sx_sunlock(&proctree_lock); 1729 1730 /* Wake up the background process groups. */ 1731 cv_broadcast(&tp->t_bgwait); 1732 return (0); 1733 } 1734 case TIOCFLUSH: { 1735 int flags = *(int *)data; 1736 1737 if (flags == 0) 1738 flags = (FREAD|FWRITE); 1739 else 1740 flags &= (FREAD|FWRITE); 1741 tty_flush(tp, flags); 1742 return (0); 1743 } 1744 case TIOCDRAIN: 1745 /* Drain TTY output. */ 1746 return tty_drain(tp, 0); 1747 case TIOCCONS: 1748 /* Set terminal as console TTY. */ 1749 if (*(int *)data) { 1750 error = priv_check(td, PRIV_TTY_CONSOLE); 1751 if (error) 1752 return (error); 1753 1754 /* 1755 * XXX: constty should really need to be locked! 1756 * XXX: allow disconnected constty's to be stolen! 1757 */ 1758 1759 if (constty == tp) 1760 return (0); 1761 if (constty != NULL) 1762 return (EBUSY); 1763 1764 tty_unlock(tp); 1765 constty_set(tp); 1766 tty_lock(tp); 1767 } else if (constty == tp) { 1768 constty_clear(); 1769 } 1770 return (0); 1771 case TIOCGWINSZ: 1772 /* Obtain window size. */ 1773 *(struct winsize*)data = tp->t_winsize; 1774 return (0); 1775 case TIOCSWINSZ: 1776 /* Set window size. */ 1777 tty_set_winsize(tp, data); 1778 return (0); 1779 case TIOCEXCL: 1780 tp->t_flags |= TF_EXCLUDE; 1781 return (0); 1782 case TIOCNXCL: 1783 tp->t_flags &= ~TF_EXCLUDE; 1784 return (0); 1785 case TIOCSTOP: 1786 tp->t_flags |= TF_STOPPED; 1787 ttydevsw_pktnotify(tp, TIOCPKT_STOP); 1788 return (0); 1789 case TIOCSTART: 1790 tp->t_flags &= ~TF_STOPPED; 1791 ttydevsw_outwakeup(tp); 1792 ttydevsw_pktnotify(tp, TIOCPKT_START); 1793 return (0); 1794 case TIOCSTAT: 1795 tty_info(tp); 1796 return (0); 1797 case TIOCSTI: 1798 if ((fflag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI)) 1799 return (EPERM); 1800 if (!tty_is_ctty(tp, td->td_proc) && 1801 priv_check(td, PRIV_TTY_STI)) 1802 return (EACCES); 1803 ttydisc_rint(tp, *(char *)data, 0); 1804 ttydisc_rint_done(tp); 1805 return (0); 1806 } 1807 1808#ifdef COMPAT_43TTY 1809 return tty_ioctl_compat(tp, cmd, data, fflag, td); 1810#else /* !COMPAT_43TTY */ 1811 return (ENOIOCTL); 1812#endif /* COMPAT_43TTY */ 1813} 1814 1815int 1816tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, struct thread *td) 1817{ 1818 int error; 1819 1820 tty_lock_assert(tp, MA_OWNED); 1821 1822 if (tty_gone(tp)) 1823 return (ENXIO); 1824 1825 error = ttydevsw_ioctl(tp, cmd, data, td); 1826 if (error == ENOIOCTL) 1827 error = tty_generic_ioctl(tp, cmd, data, fflag, td); 1828 1829 return (error); 1830} 1831 1832dev_t 1833tty_udev(struct tty *tp) 1834{ 1835 if (tp->t_dev) 1836 return dev2udev(tp->t_dev); 1837 else 1838 return NODEV; 1839} 1840 1841int 1842tty_checkoutq(struct tty *tp) 1843{ 1844 1845 /* 256 bytes should be enough to print a log message. */ 1846 return (ttyoutq_bytesleft(&tp->t_outq) >= 256); 1847} 1848 1849void 1850tty_hiwat_in_block(struct tty *tp) 1851{ 1852 1853 if ((tp->t_flags & TF_HIWAT_IN) == 0 && 1854 tp->t_termios.c_iflag & IXOFF && 1855 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) { 1856 /* 1857 * Input flow control. Only enter the high watermark when we 1858 * can successfully store the VSTOP character. 1859 */ 1860 if (ttyoutq_write_nofrag(&tp->t_outq, 1861 &tp->t_termios.c_cc[VSTOP], 1) == 0) 1862 tp->t_flags |= TF_HIWAT_IN; 1863 } else { 1864 /* No input flow control. */ 1865 tp->t_flags |= TF_HIWAT_IN; 1866 } 1867} 1868 1869void 1870tty_hiwat_in_unblock(struct tty *tp) 1871{ 1872 1873 if (tp->t_flags & TF_HIWAT_IN && 1874 tp->t_termios.c_iflag & IXOFF && 1875 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) { 1876 /* 1877 * Input flow control. Only leave the high watermark when we 1878 * can successfully store the VSTART character. 1879 */ 1880 if (ttyoutq_write_nofrag(&tp->t_outq, 1881 &tp->t_termios.c_cc[VSTART], 1) == 0) 1882 tp->t_flags &= ~TF_HIWAT_IN; 1883 } else { 1884 /* No input flow control. */ 1885 tp->t_flags &= ~TF_HIWAT_IN; 1886 } 1887 1888 if (!tty_gone(tp)) 1889 ttydevsw_inwakeup(tp); 1890} 1891 1892/* 1893 * TTY hooks interface. 1894 */ 1895 1896static int 1897ttyhook_defrint(struct tty *tp, char c, int flags) 1898{ 1899 1900 if (ttyhook_rint_bypass(tp, &c, 1) != 1) 1901 return (-1); 1902 1903 return (0); 1904} 1905 1906int 1907ttyhook_register(struct tty **rtp, struct proc *p, int fd, 1908 struct ttyhook *th, void *softc) 1909{ 1910 struct tty *tp; 1911 struct file *fp; 1912 struct cdev *dev; 1913 struct cdevsw *cdp; 1914 struct filedesc *fdp; 1915 cap_rights_t rights; 1916 int error, ref; 1917 1918 /* Validate the file descriptor. */ 1919 fdp = p->p_fd; 1920 error = fget_unlocked(fdp, fd, cap_rights_init(&rights, CAP_TTYHOOK), 1921 0, &fp, NULL); 1922 if (error != 0) 1923 return (error); 1924 if (fp->f_ops == &badfileops) { 1925 error = EBADF; 1926 goto done1; 1927 } 1928 1929 /* 1930 * Make sure the vnode is bound to a character device. 1931 * Unlocked check for the vnode type is ok there, because we 1932 * only shall prevent calling devvn_refthread on the file that 1933 * never has been opened over a character device. 1934 */ 1935 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) { 1936 error = EINVAL; 1937 goto done1; 1938 } 1939 1940 /* Make sure it is a TTY. */ 1941 cdp = devvn_refthread(fp->f_vnode, &dev, &ref); 1942 if (cdp == NULL) { 1943 error = ENXIO; 1944 goto done1; 1945 } 1946 if (dev != fp->f_data) { 1947 error = ENXIO; 1948 goto done2; 1949 } 1950 if (cdp != &ttydev_cdevsw) { 1951 error = ENOTTY; 1952 goto done2; 1953 } 1954 tp = dev->si_drv1; 1955 1956 /* Try to attach the hook to the TTY. */ 1957 error = EBUSY; 1958 tty_lock(tp); 1959 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0)); 1960 if (tp->t_flags & TF_HOOK) 1961 goto done3; 1962 1963 tp->t_flags |= TF_HOOK; 1964 tp->t_hook = th; 1965 tp->t_hooksoftc = softc; 1966 *rtp = tp; 1967 error = 0; 1968 1969 /* Maybe we can switch into bypass mode now. */ 1970 ttydisc_optimize(tp); 1971 1972 /* Silently convert rint() calls to rint_bypass() when possible. */ 1973 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass)) 1974 th->th_rint = ttyhook_defrint; 1975 1976done3: tty_unlock(tp); 1977done2: dev_relthread(dev, ref); 1978done1: fdrop(fp, curthread); 1979 return (error); 1980} 1981 1982void 1983ttyhook_unregister(struct tty *tp) 1984{ 1985 1986 tty_lock_assert(tp, MA_OWNED); 1987 MPASS(tp->t_flags & TF_HOOK); 1988 1989 /* Disconnect the hook. */ 1990 tp->t_flags &= ~TF_HOOK; 1991 tp->t_hook = NULL; 1992 1993 /* Maybe we need to leave bypass mode. */ 1994 ttydisc_optimize(tp); 1995 1996 /* Maybe deallocate the TTY as well. */ 1997 tty_rel_free(tp); 1998} 1999 2000/* 2001 * /dev/console handling. 2002 */ 2003 2004static int 2005ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 2006{ 2007 struct tty *tp; 2008 2009 /* System has no console device. */ 2010 if (dev_console_filename == NULL) 2011 return (ENXIO); 2012 2013 /* Look up corresponding TTY by device name. */ 2014 sx_slock(&tty_list_sx); 2015 TAILQ_FOREACH(tp, &tty_list, t_list) { 2016 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) { 2017 dev_console->si_drv1 = tp; 2018 break; 2019 } 2020 } 2021 sx_sunlock(&tty_list_sx); 2022 2023 /* System console has no TTY associated. */ 2024 if (dev_console->si_drv1 == NULL) 2025 return (ENXIO); 2026 2027 return (ttydev_open(dev, oflags, devtype, td)); 2028} 2029 2030static int 2031ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag) 2032{ 2033 2034 log_console(uio); 2035 2036 return (ttydev_write(dev, uio, ioflag)); 2037} 2038 2039/* 2040 * /dev/console is a little different than normal TTY's. When opened, 2041 * it determines which TTY to use. When data gets written to it, it 2042 * will be logged in the kernel message buffer. 2043 */ 2044static struct cdevsw ttyconsdev_cdevsw = { 2045 .d_version = D_VERSION, 2046 .d_open = ttyconsdev_open, 2047 .d_close = ttydev_close, 2048 .d_read = ttydev_read, 2049 .d_write = ttyconsdev_write, 2050 .d_ioctl = ttydev_ioctl, 2051 .d_kqfilter = ttydev_kqfilter, 2052 .d_poll = ttydev_poll, 2053 .d_mmap = ttydev_mmap, 2054 .d_name = "ttyconsdev", 2055 .d_flags = D_TTY, 2056}; 2057 2058static void 2059ttyconsdev_init(void *unused) 2060{ 2061 2062 dev_console = make_dev_credf(MAKEDEV_ETERNAL, &ttyconsdev_cdevsw, 0, 2063 NULL, UID_ROOT, GID_WHEEL, 0600, "console"); 2064} 2065 2066SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL); 2067 2068void 2069ttyconsdev_select(const char *name) 2070{ 2071 2072 dev_console_filename = name; 2073} 2074 2075/* 2076 * Debugging routines. 2077 */ 2078 2079#include "opt_ddb.h" 2080#ifdef DDB 2081#include <ddb/ddb.h> 2082#include <ddb/db_sym.h> 2083 2084static struct { 2085 int flag; 2086 char val; 2087} ttystates[] = { 2088#if 0 2089 { TF_NOPREFIX, 'N' }, 2090#endif 2091 { TF_INITLOCK, 'I' }, 2092 { TF_CALLOUT, 'C' }, 2093 2094 /* Keep these together -> 'Oi' and 'Oo'. */ 2095 { TF_OPENED, 'O' }, 2096 { TF_OPENED_IN, 'i' }, 2097 { TF_OPENED_OUT, 'o' }, 2098 { TF_OPENED_CONS, 'c' }, 2099 2100 { TF_GONE, 'G' }, 2101 { TF_OPENCLOSE, 'B' }, 2102 { TF_ASYNC, 'Y' }, 2103 { TF_LITERAL, 'L' }, 2104 2105 /* Keep these together -> 'Hi' and 'Ho'. */ 2106 { TF_HIWAT, 'H' }, 2107 { TF_HIWAT_IN, 'i' }, 2108 { TF_HIWAT_OUT, 'o' }, 2109 2110 { TF_STOPPED, 'S' }, 2111 { TF_EXCLUDE, 'X' }, 2112 { TF_BYPASS, 'l' }, 2113 { TF_ZOMBIE, 'Z' }, 2114 { TF_HOOK, 's' }, 2115 2116 /* Keep these together -> 'bi' and 'bo'. */ 2117 { TF_BUSY, 'b' }, 2118 { TF_BUSY_IN, 'i' }, 2119 { TF_BUSY_OUT, 'o' }, 2120 2121 { 0, '\0'}, 2122}; 2123 2124#define TTY_FLAG_BITS \ 2125 "\20\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \ 2126 "\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \ 2127 "\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK" 2128 2129#define DB_PRINTSYM(name, addr) \ 2130 db_printf("%s " #name ": ", sep); \ 2131 db_printsym((db_addr_t) addr, DB_STGY_ANY); \ 2132 db_printf("\n"); 2133 2134static void 2135_db_show_devsw(const char *sep, const struct ttydevsw *tsw) 2136{ 2137 db_printf("%sdevsw: ", sep); 2138 db_printsym((db_addr_t)tsw, DB_STGY_ANY); 2139 db_printf(" (%p)\n", tsw); 2140 DB_PRINTSYM(open, tsw->tsw_open); 2141 DB_PRINTSYM(close, tsw->tsw_close); 2142 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup); 2143 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup); 2144 DB_PRINTSYM(ioctl, tsw->tsw_ioctl); 2145 DB_PRINTSYM(param, tsw->tsw_param); 2146 DB_PRINTSYM(modem, tsw->tsw_modem); 2147 DB_PRINTSYM(mmap, tsw->tsw_mmap); 2148 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify); 2149 DB_PRINTSYM(free, tsw->tsw_free); 2150} 2151static void 2152_db_show_hooks(const char *sep, const struct ttyhook *th) 2153{ 2154 db_printf("%shook: ", sep); 2155 db_printsym((db_addr_t)th, DB_STGY_ANY); 2156 db_printf(" (%p)\n", th); 2157 if (th == NULL) 2158 return; 2159 DB_PRINTSYM(rint, th->th_rint); 2160 DB_PRINTSYM(rint_bypass, th->th_rint_bypass); 2161 DB_PRINTSYM(rint_done, th->th_rint_done); 2162 DB_PRINTSYM(rint_poll, th->th_rint_poll); 2163 DB_PRINTSYM(getc_inject, th->th_getc_inject); 2164 DB_PRINTSYM(getc_capture, th->th_getc_capture); 2165 DB_PRINTSYM(getc_poll, th->th_getc_poll); 2166 DB_PRINTSYM(close, th->th_close); 2167} 2168 2169static void 2170_db_show_termios(const char *name, const struct termios *t) 2171{ 2172 2173 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x " 2174 "lflag 0x%x ispeed %u ospeed %u\n", name, 2175 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag, 2176 t->c_ispeed, t->c_ospeed); 2177} 2178 2179/* DDB command to show TTY statistics. */ 2180DB_SHOW_COMMAND(tty, db_show_tty) 2181{ 2182 struct tty *tp; 2183 2184 if (!have_addr) { 2185 db_printf("usage: show tty <addr>\n"); 2186 return; 2187 } 2188 tp = (struct tty *)addr; 2189 2190 db_printf("0x%p: %s\n", tp, tty_devname(tp)); 2191 db_printf("\tmtx: %p\n", tp->t_mtx); 2192 db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS); 2193 db_printf("\trevokecnt: %u\n", tp->t_revokecnt); 2194 2195 /* Buffering mechanisms. */ 2196 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u " 2197 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin, 2198 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end, 2199 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota); 2200 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n", 2201 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end, 2202 tp->t_outq.to_nblocks, tp->t_outq.to_quota); 2203 db_printf("\tinlow: %zu\n", tp->t_inlow); 2204 db_printf("\toutlow: %zu\n", tp->t_outlow); 2205 _db_show_termios("\ttermios", &tp->t_termios); 2206 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n", 2207 tp->t_winsize.ws_row, tp->t_winsize.ws_col, 2208 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel); 2209 db_printf("\tcolumn: %u\n", tp->t_column); 2210 db_printf("\twritepos: %u\n", tp->t_writepos); 2211 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags); 2212 2213 /* Init/lock-state devices. */ 2214 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in); 2215 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out); 2216 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in); 2217 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out); 2218 2219 /* Hooks */ 2220 _db_show_devsw("\t", tp->t_devsw); 2221 _db_show_hooks("\t", tp->t_hook); 2222 2223 /* Process info. */ 2224 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp, 2225 tp->t_pgrp ? tp->t_pgrp->pg_id : 0, 2226 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0); 2227 db_printf("\tsession: %p", tp->t_session); 2228 if (tp->t_session != NULL) 2229 db_printf(" count %u leader %p tty %p sid %d login %s", 2230 tp->t_session->s_count, tp->t_session->s_leader, 2231 tp->t_session->s_ttyp, tp->t_session->s_sid, 2232 tp->t_session->s_login); 2233 db_printf("\n"); 2234 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt); 2235 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc); 2236 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc); 2237 db_printf("\tdev: %p\n", tp->t_dev); 2238} 2239 2240/* DDB command to list TTYs. */ 2241DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys) 2242{ 2243 struct tty *tp; 2244 size_t isiz, osiz; 2245 int i, j; 2246 2247 /* Make the output look like `pstat -t'. */ 2248 db_printf("PTR "); 2249#if defined(__LP64__) 2250 db_printf(" "); 2251#endif 2252 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW " 2253 "COL SESS PGID STATE\n"); 2254 2255 TAILQ_FOREACH(tp, &tty_list, t_list) { 2256 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE; 2257 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE; 2258 2259 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ", 2260 tp, 2261 tty_devname(tp), 2262 isiz, 2263 tp->t_inq.ti_linestart - tp->t_inq.ti_begin, 2264 tp->t_inq.ti_end - tp->t_inq.ti_linestart, 2265 isiz - tp->t_inlow, 2266 osiz, 2267 tp->t_outq.to_end - tp->t_outq.to_begin, 2268 osiz - tp->t_outlow, 2269 MIN(tp->t_column, 99999), 2270 tp->t_session ? tp->t_session->s_sid : 0, 2271 tp->t_pgrp ? tp->t_pgrp->pg_id : 0); 2272 2273 /* Flag bits. */ 2274 for (i = j = 0; ttystates[i].flag; i++) 2275 if (tp->t_flags & ttystates[i].flag) { 2276 db_printf("%c", ttystates[i].val); 2277 j++; 2278 } 2279 if (j == 0) 2280 db_printf("-"); 2281 db_printf("\n"); 2282 } 2283} 2284#endif /* DDB */ 2285