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 70 static MALLOC_DEFINE(M_TTY, "tty", "tty device"); 71 72 static void tty_rel_free(struct tty *tp); 73 74 static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list); 75 static struct sx tty_list_sx; 76 SX_SYSINIT(tty_list, &tty_list_sx, "tty list"); 77 static unsigned int tty_list_count = 0; 78 79 /* Character device of /dev/console. */ 80 static struct cdev *dev_console; 81 static 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 103 104 static void 105 tty_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 } 124 125 static int 126 tty_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 */ 157 158 static __inline int 159 ttydev_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 } 171 172 static void 173 ttydev_leave(struct tty *tp) 174 { 175 tty_lock_assert(tp, MA_OWNED); 176 177 if (tty_opened(tp) || tp->t_flags & TF_OPENCLOSE) { 178 /* Device is still opened somewhere. */ 179 tty_unlock(tp); 180 return; 181 } 182 183 tp->t_flags |= TF_OPENCLOSE; 184 185 /* Stop asynchronous I/O. */ 186 funsetown(&tp->t_sigio); 187 188 /* Remove console TTY. */ 189 if (constty == tp) 190 constty_clear(); 191 192 /* Drain any output. */ 193 MPASS((tp->t_flags & TF_STOPPED) == 0); 194 if (!tty_gone(tp)) 195 tty_drain(tp); 196 197 ttydisc_close(tp); 198 199 /* Destroy associated buffers already. */ 200 ttyinq_free(&tp->t_inq); 201 tp->t_inlow = 0; 202 ttyoutq_free(&tp->t_outq); 203 tp->t_outlow = 0; 204 205 knlist_clear(&tp->t_inpoll.si_note, 1); 206 knlist_clear(&tp->t_outpoll.si_note, 1); 207 208 if (!tty_gone(tp)) 209 ttydevsw_close(tp); 210 211 tp->t_flags &= ~TF_OPENCLOSE; 212 cv_broadcast(&tp->t_dcdwait); 213 tty_rel_free(tp); 214 } 215 216 /* 217 * Operations that are exposed through the character device in /dev. 218 */ 219 static int 220 ttydev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 221 { 222 struct tty *tp; 223 int error = 0; 224 225 while ((tp = dev->si_drv1) == NULL) { 226 error = tsleep(&dev->si_drv1, PCATCH, "ttdrv1", 1); 227 if (error != EWOULDBLOCK) 228 return (error); 229 } 230 231 tty_lock(tp); 232 if (tty_gone(tp)) { 233 /* Device is already gone. */ 234 tty_unlock(tp); 235 return (ENXIO); 236 } 237 238 /* 239 * Block when other processes are currently opening or closing 240 * the TTY. 241 */ 242 while (tp->t_flags & TF_OPENCLOSE) { 243 error = tty_wait(tp, &tp->t_dcdwait); 244 if (error != 0) { 245 tty_unlock(tp); 246 return (error); 247 } 248 } 249 tp->t_flags |= TF_OPENCLOSE; 250 251 /* 252 * Make sure the "tty" and "cua" device cannot be opened at the 253 * same time. 254 */ 255 if (TTY_CALLOUT(tp, dev)) { 256 if (tp->t_flags & TF_OPENED_IN) { 257 error = EBUSY; 258 goto done; 259 } 260 } else { 261 if (tp->t_flags & TF_OPENED_OUT) { 262 error = EBUSY; 263 goto done; 264 } 265 } 266 267 if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) { 268 error = EBUSY; 269 goto done; 270 } 271 272 if (!tty_opened(tp)) { 273 /* Set proper termios flags. */ 274 if (TTY_CALLOUT(tp, dev)) 275 tp->t_termios = tp->t_termios_init_out; 276 else 277 tp->t_termios = tp->t_termios_init_in; 278 ttydevsw_param(tp, &tp->t_termios); 279 /* Prevent modem control on callout devices and /dev/console. */ 280 if (TTY_CALLOUT(tp, dev) || dev == dev_console) 281 tp->t_termios.c_cflag |= CLOCAL; 282 283 ttydevsw_modem(tp, SER_DTR|SER_RTS, 0); 284 285 error = ttydevsw_open(tp); 286 if (error != 0) 287 goto done; 288 289 ttydisc_open(tp); 290 tty_watermarks(tp); 291 } 292 293 /* Wait for Carrier Detect. */ 294 if ((oflags & O_NONBLOCK) == 0 && 295 (tp->t_termios.c_cflag & CLOCAL) == 0) { 296 while ((ttydevsw_modem(tp, 0, 0) & SER_DCD) == 0) { 297 error = tty_wait(tp, &tp->t_dcdwait); 298 if (error != 0) 299 goto done; 300 } 301 } 302 303 if (dev == dev_console) 304 tp->t_flags |= TF_OPENED_CONS; 305 else if (TTY_CALLOUT(tp, dev)) 306 tp->t_flags |= TF_OPENED_OUT; 307 else 308 tp->t_flags |= TF_OPENED_IN; 309 310 done: tp->t_flags &= ~TF_OPENCLOSE; 311 cv_broadcast(&tp->t_dcdwait); 312 ttydev_leave(tp); 313 314 return (error); 315 } 316 317 static int 318 ttydev_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 319 { 320 struct tty *tp = dev->si_drv1; 321 322 tty_lock(tp); 323 324 /* 325 * Don't actually close the device if it is being used as the 326 * console. 327 */ 328 MPASS((tp->t_flags & TF_OPENED) != TF_OPENED); 329 if (dev == dev_console) 330 tp->t_flags &= ~TF_OPENED_CONS; 331 else 332 tp->t_flags &= ~(TF_OPENED_IN|TF_OPENED_OUT); 333 334 if (tp->t_flags & TF_OPENED) { 335 tty_unlock(tp); 336 return (0); 337 } 338 339 /* 340 * This can only be called once. The callin and the callout 341 * devices cannot be opened at the same time. 342 */ 343 tp->t_flags &= ~(TF_EXCLUDE|TF_STOPPED); 344 345 /* Properly wake up threads that are stuck - revoke(). */ 346 tp->t_revokecnt++; 347 tty_wakeup(tp, FREAD|FWRITE); 348 cv_broadcast(&tp->t_bgwait); 349 cv_broadcast(&tp->t_dcdwait); 350 351 ttydev_leave(tp); 352 353 return (0); 354 } 355 356 static __inline int 357 tty_is_ctty(struct tty *tp, struct proc *p) 358 { 359 tty_lock_assert(tp, MA_OWNED); 360 361 return (p->p_session == tp->t_session && p->p_flag & P_CONTROLT); 362 } 363 364 int 365 tty_wait_background(struct tty *tp, struct thread *td, int sig) 366 { 367 struct proc *p = td->td_proc; 368 struct pgrp *pg; 369 ksiginfo_t ksi; 370 int error; 371 372 MPASS(sig == SIGTTIN || sig == SIGTTOU); 373 tty_lock_assert(tp, MA_OWNED); 374 375 for (;;) { 376 PROC_LOCK(p); 377 /* 378 * The process should only sleep, when: 379 * - This terminal is the controling terminal 380 * - Its process group is not the foreground process 381 * group 382 * - The parent process isn't waiting for the child to 383 * exit 384 * - the signal to send to the process isn't masked 385 */ 386 if (!tty_is_ctty(tp, p) || p->p_pgrp == tp->t_pgrp) { 387 /* Allow the action to happen. */ 388 PROC_UNLOCK(p); 389 return (0); 390 } 391 392 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, sig) || 393 SIGISMEMBER(td->td_sigmask, sig)) { 394 /* Only allow them in write()/ioctl(). */ 395 PROC_UNLOCK(p); 396 return (sig == SIGTTOU ? 0 : EIO); 397 } 398 399 pg = p->p_pgrp; 400 if (p->p_flag & P_PPWAIT || pg->pg_jobc == 0) { 401 /* Don't allow the action to happen. */ 402 PROC_UNLOCK(p); 403 return (EIO); 404 } 405 PROC_UNLOCK(p); 406 407 /* 408 * Send the signal and sleep until we're the new 409 * foreground process group. 410 */ 411 if (sig != 0) { 412 ksiginfo_init(&ksi); 413 ksi.ksi_code = SI_KERNEL; 414 ksi.ksi_signo = sig; 415 sig = 0; 416 } 417 PGRP_LOCK(pg); 418 pgsignal(pg, ksi.ksi_signo, 1, &ksi); 419 PGRP_UNLOCK(pg); 420 421 error = tty_wait(tp, &tp->t_bgwait); 422 if (error) 423 return (error); 424 } 425 } 426 427 static int 428 ttydev_read(struct cdev *dev, struct uio *uio, int ioflag) 429 { 430 struct tty *tp = dev->si_drv1; 431 int error; 432 433 error = ttydev_enter(tp); 434 if (error) 435 goto done; 436 error = ttydisc_read(tp, uio, ioflag); 437 tty_unlock(tp); 438 439 /* 440 * The read() call should not throw an error when the device is 441 * being destroyed. Silently convert it to an EOF. 442 */ 443 done: if (error == ENXIO) 444 error = 0; 445 return (error); 446 } 447 448 static int 449 ttydev_write(struct cdev *dev, struct uio *uio, int ioflag) 450 { 451 struct tty *tp = dev->si_drv1; 452 int error; 453 454 error = ttydev_enter(tp); 455 if (error) 456 return (error); 457 458 if (tp->t_termios.c_lflag & TOSTOP) { 459 error = tty_wait_background(tp, curthread, SIGTTOU); 460 if (error) 461 goto done; 462 } 463 464 if (ioflag & IO_NDELAY && tp->t_flags & TF_BUSY_OUT) { 465 /* Allow non-blocking writes to bypass serialization. */ 466 error = ttydisc_write(tp, uio, ioflag); 467 } else { 468 /* Serialize write() calls. */ 469 while (tp->t_flags & TF_BUSY_OUT) { 470 error = tty_wait(tp, &tp->t_outserwait); 471 if (error) 472 goto done; 473 } 474 475 tp->t_flags |= TF_BUSY_OUT; 476 error = ttydisc_write(tp, uio, ioflag); 477 tp->t_flags &= ~TF_BUSY_OUT; 478 cv_signal(&tp->t_outserwait); 479 } 480 481 done: tty_unlock(tp); 482 return (error); 483 } 484 485 static int 486 ttydev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 487 struct thread *td) 488 { 489 struct tty *tp = dev->si_drv1; 490 int error; 491 492 error = ttydev_enter(tp); 493 if (error) 494 return (error); 495 496 switch (cmd) { 497 case TIOCCBRK: 498 case TIOCCONS: 499 case TIOCDRAIN: 500 case TIOCEXCL: 501 case TIOCFLUSH: 502 case TIOCNXCL: 503 case TIOCSBRK: 504 case TIOCSCTTY: 505 case TIOCSETA: 506 case TIOCSETAF: 507 case TIOCSETAW: 508 case TIOCSPGRP: 509 case TIOCSTART: 510 case TIOCSTAT: 511 case TIOCSTI: 512 case TIOCSTOP: 513 case TIOCSWINSZ: 514 #if 0 515 case TIOCSDRAINWAIT: 516 case TIOCSETD: 517 #endif 518 #ifdef COMPAT_43TTY 519 case TIOCLBIC: 520 case TIOCLBIS: 521 case TIOCLSET: 522 case TIOCSETC: 523 case OTIOCSETD: 524 case TIOCSETN: 525 case TIOCSETP: 526 case TIOCSLTC: 527 #endif /* COMPAT_43TTY */ 528 /* 529 * If the ioctl() causes the TTY to be modified, let it 530 * wait in the background. 531 */ 532 error = tty_wait_background(tp, curthread, SIGTTOU); 533 if (error) 534 goto done; 535 } 536 537 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 538 struct termios *old = &tp->t_termios; 539 struct termios *new = (struct termios *)data; 540 struct termios *lock = TTY_CALLOUT(tp, dev) ? 541 &tp->t_termios_lock_out : &tp->t_termios_lock_in; 542 int cc; 543 544 /* 545 * Lock state devices. Just overwrite the values of the 546 * commands that are currently in use. 547 */ 548 new->c_iflag = (old->c_iflag & lock->c_iflag) | 549 (new->c_iflag & ~lock->c_iflag); 550 new->c_oflag = (old->c_oflag & lock->c_oflag) | 551 (new->c_oflag & ~lock->c_oflag); 552 new->c_cflag = (old->c_cflag & lock->c_cflag) | 553 (new->c_cflag & ~lock->c_cflag); 554 new->c_lflag = (old->c_lflag & lock->c_lflag) | 555 (new->c_lflag & ~lock->c_lflag); 556 for (cc = 0; cc < NCCS; ++cc) 557 if (lock->c_cc[cc]) 558 new->c_cc[cc] = old->c_cc[cc]; 559 if (lock->c_ispeed) 560 new->c_ispeed = old->c_ispeed; 561 if (lock->c_ospeed) 562 new->c_ospeed = old->c_ospeed; 563 } 564 565 error = tty_ioctl(tp, cmd, data, fflag, td); 566 done: tty_unlock(tp); 567 568 return (error); 569 } 570 571 static int 572 ttydev_poll(struct cdev *dev, int events, struct thread *td) 573 { 574 struct tty *tp = dev->si_drv1; 575 int error, revents = 0; 576 577 error = ttydev_enter(tp); 578 if (error) 579 return ((events & (POLLIN|POLLRDNORM)) | POLLHUP); 580 581 if (events & (POLLIN|POLLRDNORM)) { 582 /* See if we can read something. */ 583 if (ttydisc_read_poll(tp) > 0) 584 revents |= events & (POLLIN|POLLRDNORM); 585 } 586 587 if (tp->t_flags & TF_ZOMBIE) { 588 /* Hangup flag on zombie state. */ 589 revents |= POLLHUP; 590 } else if (events & (POLLOUT|POLLWRNORM)) { 591 /* See if we can write something. */ 592 if (ttydisc_write_poll(tp) > 0) 593 revents |= events & (POLLOUT|POLLWRNORM); 594 } 595 596 if (revents == 0) { 597 if (events & (POLLIN|POLLRDNORM)) 598 selrecord(td, &tp->t_inpoll); 599 if (events & (POLLOUT|POLLWRNORM)) 600 selrecord(td, &tp->t_outpoll); 601 } 602 603 tty_unlock(tp); 604 605 return (revents); 606 } 607 608 static int 609 ttydev_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 610 int nprot, vm_memattr_t *memattr) 611 { 612 struct tty *tp = dev->si_drv1; 613 int error; 614 615 /* Handle mmap() through the driver. */ 616 617 error = ttydev_enter(tp); 618 if (error) 619 return (-1); 620 error = ttydevsw_mmap(tp, offset, paddr, nprot, memattr); 621 tty_unlock(tp); 622 623 return (error); 624 } 625 626 /* 627 * kqueue support. 628 */ 629 630 static void 631 tty_kqops_read_detach(struct knote *kn) 632 { 633 struct tty *tp = kn->kn_hook; 634 635 knlist_remove(&tp->t_inpoll.si_note, kn, 0); 636 } 637 638 static int 639 tty_kqops_read_event(struct knote *kn, long hint) 640 { 641 struct tty *tp = kn->kn_hook; 642 643 tty_lock_assert(tp, MA_OWNED); 644 645 if (tty_gone(tp) || tp->t_flags & TF_ZOMBIE) { 646 kn->kn_flags |= EV_EOF; 647 return (1); 648 } else { 649 kn->kn_data = ttydisc_read_poll(tp); 650 return (kn->kn_data > 0); 651 } 652 } 653 654 static void 655 tty_kqops_write_detach(struct knote *kn) 656 { 657 struct tty *tp = kn->kn_hook; 658 659 knlist_remove(&tp->t_outpoll.si_note, kn, 0); 660 } 661 662 static int 663 tty_kqops_write_event(struct knote *kn, long hint) 664 { 665 struct tty *tp = kn->kn_hook; 666 667 tty_lock_assert(tp, MA_OWNED); 668 669 if (tty_gone(tp)) { 670 kn->kn_flags |= EV_EOF; 671 return (1); 672 } else { 673 kn->kn_data = ttydisc_write_poll(tp); 674 return (kn->kn_data > 0); 675 } 676 } 677 678 static struct filterops tty_kqops_read = { 679 .f_isfd = 1, 680 .f_detach = tty_kqops_read_detach, 681 .f_event = tty_kqops_read_event, 682 }; 683 static struct filterops tty_kqops_write = { 684 .f_isfd = 1, 685 .f_detach = tty_kqops_write_detach, 686 .f_event = tty_kqops_write_event, 687 }; 688 689 static int 690 ttydev_kqfilter(struct cdev *dev, struct knote *kn) 691 { 692 struct tty *tp = dev->si_drv1; 693 int error; 694 695 error = ttydev_enter(tp); 696 if (error) 697 return (error); 698 699 switch (kn->kn_filter) { 700 case EVFILT_READ: 701 kn->kn_hook = tp; 702 kn->kn_fop = &tty_kqops_read; 703 knlist_add(&tp->t_inpoll.si_note, kn, 1); 704 break; 705 case EVFILT_WRITE: 706 kn->kn_hook = tp; 707 kn->kn_fop = &tty_kqops_write; 708 knlist_add(&tp->t_outpoll.si_note, kn, 1); 709 break; 710 default: 711 error = EINVAL; 712 break; 713 } 714 715 tty_unlock(tp); 716 return (error); 717 } 718 719 static struct cdevsw ttydev_cdevsw = { 720 .d_version = D_VERSION, 721 .d_open = ttydev_open, 722 .d_close = ttydev_close, 723 .d_read = ttydev_read, 724 .d_write = ttydev_write, 725 .d_ioctl = ttydev_ioctl, 726 .d_kqfilter = ttydev_kqfilter, 727 .d_poll = ttydev_poll, 728 .d_mmap = ttydev_mmap, 729 .d_name = "ttydev", 730 .d_flags = D_TTY, 731 }; 732 733 /* 734 * Init/lock-state devices 735 */ 736 737 static int 738 ttyil_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 739 { 740 struct tty *tp; 741 int error = 0; 742 743 while ((tp = dev->si_drv1) == NULL) { 744 error = tsleep(&dev->si_drv1, PCATCH, "ttdrv1", 1); 745 if (error != EWOULDBLOCK) 746 return (error); 747 } 748 tty_lock(tp); 749 if (tty_gone(tp)) 750 error = ENODEV; 751 tty_unlock(tp); 752 753 return (error); 754 } 755 756 static int 757 ttyil_close(struct cdev *dev, int flag, int mode, struct thread *td) 758 { 759 return (0); 760 } 761 762 static int 763 ttyil_rdwr(struct cdev *dev, struct uio *uio, int ioflag) 764 { 765 return (ENODEV); 766 } 767 768 static int 769 ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 770 struct thread *td) 771 { 772 struct tty *tp = dev->si_drv1; 773 int error; 774 775 tty_lock(tp); 776 if (tty_gone(tp)) { 777 error = ENODEV; 778 goto done; 779 } 780 781 error = ttydevsw_cioctl(tp, dev2unit(dev), cmd, data, td); 782 if (error != ENOIOCTL) 783 goto done; 784 error = 0; 785 786 switch (cmd) { 787 case TIOCGETA: 788 /* Obtain terminal flags through tcgetattr(). */ 789 *(struct termios*)data = *(struct termios*)dev->si_drv2; 790 break; 791 case TIOCSETA: 792 /* Set terminal flags through tcsetattr(). */ 793 error = priv_check(td, PRIV_TTY_SETA); 794 if (error) 795 break; 796 *(struct termios*)dev->si_drv2 = *(struct termios*)data; 797 break; 798 case TIOCGETD: 799 *(int *)data = TTYDISC; 800 break; 801 case TIOCGWINSZ: 802 bzero(data, sizeof(struct winsize)); 803 break; 804 default: 805 error = ENOTTY; 806 } 807 808 done: tty_unlock(tp); 809 return (error); 810 } 811 812 static struct cdevsw ttyil_cdevsw = { 813 .d_version = D_VERSION, 814 .d_open = ttyil_open, 815 .d_close = ttyil_close, 816 .d_read = ttyil_rdwr, 817 .d_write = ttyil_rdwr, 818 .d_ioctl = ttyil_ioctl, 819 .d_name = "ttyil", 820 .d_flags = D_TTY, 821 }; 822 823 static void 824 tty_init_termios(struct tty *tp) 825 { 826 struct termios *t = &tp->t_termios_init_in; 827 828 t->c_cflag = TTYDEF_CFLAG; 829 t->c_iflag = TTYDEF_IFLAG; 830 t->c_lflag = TTYDEF_LFLAG; 831 t->c_oflag = TTYDEF_OFLAG; 832 t->c_ispeed = TTYDEF_SPEED; 833 t->c_ospeed = TTYDEF_SPEED; 834 memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars); 835 836 tp->t_termios_init_out = *t; 837 } 838 839 void 840 tty_init_console(struct tty *tp, speed_t s) 841 { 842 struct termios *ti = &tp->t_termios_init_in; 843 struct termios *to = &tp->t_termios_init_out; 844 845 if (s != 0) { 846 ti->c_ispeed = ti->c_ospeed = s; 847 to->c_ispeed = to->c_ospeed = s; 848 } 849 850 ti->c_cflag |= CLOCAL; 851 to->c_cflag |= CLOCAL; 852 } 853 854 /* 855 * Standard device routine implementations, mostly meant for 856 * pseudo-terminal device drivers. When a driver creates a new terminal 857 * device class, missing routines are patched. 858 */ 859 860 static int 861 ttydevsw_defopen(struct tty *tp) 862 { 863 864 return (0); 865 } 866 867 static void 868 ttydevsw_defclose(struct tty *tp) 869 { 870 } 871 872 static void 873 ttydevsw_defoutwakeup(struct tty *tp) 874 { 875 876 panic("Terminal device has output, while not implemented"); 877 } 878 879 static void 880 ttydevsw_definwakeup(struct tty *tp) 881 { 882 } 883 884 static int 885 ttydevsw_defioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td) 886 { 887 888 return (ENOIOCTL); 889 } 890 891 static int 892 ttydevsw_defcioctl(struct tty *tp, int unit, u_long cmd, caddr_t data, struct thread *td) 893 { 894 895 return (ENOIOCTL); 896 } 897 898 static int 899 ttydevsw_defparam(struct tty *tp, struct termios *t) 900 { 901 902 /* 903 * Allow the baud rate to be adjusted for pseudo-devices, but at 904 * least restrict it to 115200 to prevent excessive buffer 905 * usage. Also disallow 0, to prevent foot shooting. 906 */ 907 if (t->c_ispeed < B50) 908 t->c_ispeed = B50; 909 else if (t->c_ispeed > B115200) 910 t->c_ispeed = B115200; 911 if (t->c_ospeed < B50) 912 t->c_ospeed = B50; 913 else if (t->c_ospeed > B115200) 914 t->c_ospeed = B115200; 915 t->c_cflag |= CREAD; 916 917 return (0); 918 } 919 920 static int 921 ttydevsw_defmodem(struct tty *tp, int sigon, int sigoff) 922 { 923 924 /* Simulate a carrier to make the TTY layer happy. */ 925 return (SER_DCD); 926 } 927 928 static int 929 ttydevsw_defmmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t *paddr, 930 int nprot, vm_memattr_t *memattr) 931 { 932 933 return (-1); 934 } 935 936 static void 937 ttydevsw_defpktnotify(struct tty *tp, char event) 938 { 939 } 940 941 static void 942 ttydevsw_deffree(void *softc) 943 { 944 945 panic("Terminal device freed without a free-handler"); 946 } 947 948 /* 949 * TTY allocation and deallocation. TTY devices can be deallocated when 950 * the driver doesn't use it anymore, when the TTY isn't a session's 951 * controlling TTY and when the device node isn't opened through devfs. 952 */ 953 954 struct tty * 955 tty_alloc(struct ttydevsw *tsw, void *sc) 956 { 957 958 return (tty_alloc_mutex(tsw, sc, NULL)); 959 } 960 961 struct tty * 962 tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex) 963 { 964 struct tty *tp; 965 966 /* Make sure the driver defines all routines. */ 967 #define PATCH_FUNC(x) do { \ 968 if (tsw->tsw_ ## x == NULL) \ 969 tsw->tsw_ ## x = ttydevsw_def ## x; \ 970 } while (0) 971 PATCH_FUNC(open); 972 PATCH_FUNC(close); 973 PATCH_FUNC(outwakeup); 974 PATCH_FUNC(inwakeup); 975 PATCH_FUNC(ioctl); 976 PATCH_FUNC(cioctl); 977 PATCH_FUNC(param); 978 PATCH_FUNC(modem); 979 PATCH_FUNC(mmap); 980 PATCH_FUNC(pktnotify); 981 PATCH_FUNC(free); 982 #undef PATCH_FUNC 983 984 tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO); 985 tp->t_devsw = tsw; 986 tp->t_devswsoftc = sc; 987 tp->t_flags = tsw->tsw_flags; 988 989 tty_init_termios(tp); 990 991 cv_init(&tp->t_inwait, "ttyin"); 992 cv_init(&tp->t_outwait, "ttyout"); 993 cv_init(&tp->t_outserwait, "ttyosr"); 994 cv_init(&tp->t_bgwait, "ttybg"); 995 cv_init(&tp->t_dcdwait, "ttydcd"); 996 997 /* Allow drivers to use a custom mutex to lock the TTY. */ 998 if (mutex != NULL) { 999 tp->t_mtx = mutex; 1000 } else { 1001 tp->t_mtx = &tp->t_mtxobj; 1002 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF); 1003 } 1004 1005 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx); 1006 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx); 1007 1008 sx_xlock(&tty_list_sx); 1009 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 1010 tty_list_count++; 1011 sx_xunlock(&tty_list_sx); 1012 1013 return (tp); 1014 } 1015 1016 static void 1017 tty_dealloc(void *arg) 1018 { 1019 struct tty *tp = arg; 1020 1021 sx_xlock(&tty_list_sx); 1022 TAILQ_REMOVE(&tty_list, tp, t_list); 1023 tty_list_count--; 1024 sx_xunlock(&tty_list_sx); 1025 1026 /* Make sure we haven't leaked buffers. */ 1027 MPASS(ttyinq_getsize(&tp->t_inq) == 0); 1028 MPASS(ttyoutq_getsize(&tp->t_outq) == 0); 1029 1030 seldrain(&tp->t_inpoll); 1031 seldrain(&tp->t_outpoll); 1032 knlist_destroy(&tp->t_inpoll.si_note); 1033 knlist_destroy(&tp->t_outpoll.si_note); 1034 1035 cv_destroy(&tp->t_inwait); 1036 cv_destroy(&tp->t_outwait); 1037 cv_destroy(&tp->t_bgwait); 1038 cv_destroy(&tp->t_dcdwait); 1039 cv_destroy(&tp->t_outserwait); 1040 1041 if (tp->t_mtx == &tp->t_mtxobj) 1042 mtx_destroy(&tp->t_mtxobj); 1043 ttydevsw_free(tp); 1044 free(tp, M_TTY); 1045 } 1046 1047 static void 1048 tty_rel_free(struct tty *tp) 1049 { 1050 struct cdev *dev; 1051 1052 tty_lock_assert(tp, MA_OWNED); 1053 1054 #define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE) 1055 if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) { 1056 /* TTY is still in use. */ 1057 tty_unlock(tp); 1058 return; 1059 } 1060 1061 /* TTY can be deallocated. */ 1062 dev = tp->t_dev; 1063 tp->t_dev = NULL; 1064 tty_unlock(tp); 1065 1066 if (dev != NULL) 1067 destroy_dev_sched_cb(dev, tty_dealloc, tp); 1068 } 1069 1070 void 1071 tty_rel_pgrp(struct tty *tp, struct pgrp *pg) 1072 { 1073 MPASS(tp->t_sessioncnt > 0); 1074 tty_lock_assert(tp, MA_OWNED); 1075 1076 if (tp->t_pgrp == pg) 1077 tp->t_pgrp = NULL; 1078 1079 tty_unlock(tp); 1080 } 1081 1082 void 1083 tty_rel_sess(struct tty *tp, struct session *sess) 1084 { 1085 MPASS(tp->t_sessioncnt > 0); 1086 1087 /* Current session has left. */ 1088 if (tp->t_session == sess) { 1089 tp->t_session = NULL; 1090 MPASS(tp->t_pgrp == NULL); 1091 } 1092 tp->t_sessioncnt--; 1093 tty_rel_free(tp); 1094 } 1095 1096 void 1097 tty_rel_gone(struct tty *tp) 1098 { 1099 MPASS(!tty_gone(tp)); 1100 1101 /* Simulate carrier removal. */ 1102 ttydisc_modem(tp, 0); 1103 1104 /* Wake up all blocked threads. */ 1105 tty_wakeup(tp, FREAD|FWRITE); 1106 cv_broadcast(&tp->t_bgwait); 1107 cv_broadcast(&tp->t_dcdwait); 1108 1109 tp->t_flags |= TF_GONE; 1110 tty_rel_free(tp); 1111 } 1112 1113 /* 1114 * Exposing information about current TTY's through sysctl 1115 */ 1116 1117 static void 1118 tty_to_xtty(struct tty *tp, struct xtty *xt) 1119 { 1120 tty_lock_assert(tp, MA_OWNED); 1121 1122 xt->xt_size = sizeof(struct xtty); 1123 xt->xt_insize = ttyinq_getsize(&tp->t_inq); 1124 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq); 1125 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq); 1126 xt->xt_inlow = tp->t_inlow; 1127 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq); 1128 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq); 1129 xt->xt_outlow = tp->t_outlow; 1130 xt->xt_column = tp->t_column; 1131 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1132 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0; 1133 xt->xt_flags = tp->t_flags; 1134 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV; 1135 } 1136 1137 static int 1138 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 1139 { 1140 unsigned long lsize; 1141 struct xtty *xtlist, *xt; 1142 struct tty *tp; 1143 int error; 1144 1145 sx_slock(&tty_list_sx); 1146 lsize = tty_list_count * sizeof(struct xtty); 1147 if (lsize == 0) { 1148 sx_sunlock(&tty_list_sx); 1149 return (0); 1150 } 1151 1152 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK); 1153 1154 TAILQ_FOREACH(tp, &tty_list, t_list) { 1155 tty_lock(tp); 1156 tty_to_xtty(tp, xt); 1157 tty_unlock(tp); 1158 xt++; 1159 } 1160 sx_sunlock(&tty_list_sx); 1161 1162 error = SYSCTL_OUT(req, xtlist, lsize); 1163 free(xtlist, M_TTY); 1164 return (error); 1165 } 1166 1167 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 1168 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs"); 1169 1170 /* 1171 * Device node creation. Device has been set up, now we can expose it to 1172 * the user. 1173 */ 1174 1175 void 1176 tty_makedev(struct tty *tp, struct ucred *cred, const char *fmt, ...) 1177 { 1178 va_list ap; 1179 struct cdev *dev; 1180 const char *prefix = "tty"; 1181 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */ 1182 uid_t uid; 1183 gid_t gid; 1184 mode_t mode; 1185 1186 /* Remove "tty" prefix from devices like PTY's. */ 1187 if (tp->t_flags & TF_NOPREFIX) 1188 prefix = ""; 1189 1190 va_start(ap, fmt); 1191 vsnrprintf(name, sizeof name, 32, fmt, ap); 1192 va_end(ap); 1193 1194 if (cred == NULL) { 1195 /* System device. */ 1196 uid = UID_ROOT; 1197 gid = GID_WHEEL; 1198 mode = S_IRUSR|S_IWUSR; 1199 } else { 1200 /* User device. */ 1201 uid = cred->cr_ruid; 1202 gid = GID_TTY; 1203 mode = S_IRUSR|S_IWUSR|S_IWGRP; 1204 } 1205 1206 /* Master call-in device. */ 1207 dev = make_dev_cred(&ttydev_cdevsw, 0, cred, 1208 uid, gid, mode, "%s%s", prefix, name); 1209 dev->si_drv1 = tp; 1210 wakeup(&dev->si_drv1); 1211 tp->t_dev = dev; 1212 1213 /* Slave call-in devices. */ 1214 if (tp->t_flags & TF_INITLOCK) { 1215 dev = make_dev_cred(&ttyil_cdevsw, TTYUNIT_INIT, cred, 1216 uid, gid, mode, "%s%s.init", prefix, name); 1217 dev_depends(tp->t_dev, dev); 1218 dev->si_drv1 = tp; 1219 wakeup(&dev->si_drv1); 1220 dev->si_drv2 = &tp->t_termios_init_in; 1221 1222 dev = make_dev_cred(&ttyil_cdevsw, TTYUNIT_LOCK, cred, 1223 uid, gid, mode, "%s%s.lock", prefix, name); 1224 dev_depends(tp->t_dev, dev); 1225 dev->si_drv1 = tp; 1226 wakeup(&dev->si_drv1); 1227 dev->si_drv2 = &tp->t_termios_lock_in; 1228 } 1229 1230 /* Call-out devices. */ 1231 if (tp->t_flags & TF_CALLOUT) { 1232 dev = make_dev_cred(&ttydev_cdevsw, TTYUNIT_CALLOUT, cred, 1233 UID_UUCP, GID_DIALER, 0660, "cua%s", name); 1234 dev_depends(tp->t_dev, dev); 1235 dev->si_drv1 = tp; 1236 wakeup(&dev->si_drv1); 1237 1238 /* Slave call-out devices. */ 1239 if (tp->t_flags & TF_INITLOCK) { 1240 dev = make_dev_cred(&ttyil_cdevsw, 1241 TTYUNIT_CALLOUT | TTYUNIT_INIT, cred, 1242 UID_UUCP, GID_DIALER, 0660, "cua%s.init", name); 1243 dev_depends(tp->t_dev, dev); 1244 dev->si_drv1 = tp; 1245 wakeup(&dev->si_drv1); 1246 dev->si_drv2 = &tp->t_termios_init_out; 1247 1248 dev = make_dev_cred(&ttyil_cdevsw, 1249 TTYUNIT_CALLOUT | TTYUNIT_LOCK, cred, 1250 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", name); 1251 dev_depends(tp->t_dev, dev); 1252 dev->si_drv1 = tp; 1253 wakeup(&dev->si_drv1); 1254 dev->si_drv2 = &tp->t_termios_lock_out; 1255 } 1256 } 1257 } 1258 1259 /* 1260 * Signalling processes. 1261 */ 1262 1263 void 1264 tty_signal_sessleader(struct tty *tp, int sig) 1265 { 1266 struct proc *p; 1267 1268 tty_lock_assert(tp, MA_OWNED); 1269 MPASS(sig >= 1 && sig < NSIG); 1270 1271 /* Make signals start output again. */ 1272 tp->t_flags &= ~TF_STOPPED; 1273 1274 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) { 1275 p = tp->t_session->s_leader; 1276 PROC_LOCK(p); 1277 kern_psignal(p, sig); 1278 PROC_UNLOCK(p); 1279 } 1280 } 1281 1282 void 1283 tty_signal_pgrp(struct tty *tp, int sig) 1284 { 1285 ksiginfo_t ksi; 1286 1287 tty_lock_assert(tp, MA_OWNED); 1288 MPASS(sig >= 1 && sig < NSIG); 1289 1290 /* Make signals start output again. */ 1291 tp->t_flags &= ~TF_STOPPED; 1292 1293 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO)) 1294 tty_info(tp); 1295 if (tp->t_pgrp != NULL) { 1296 ksiginfo_init(&ksi); 1297 ksi.ksi_signo = sig; 1298 ksi.ksi_code = SI_KERNEL; 1299 PGRP_LOCK(tp->t_pgrp); 1300 pgsignal(tp->t_pgrp, sig, 1, &ksi); 1301 PGRP_UNLOCK(tp->t_pgrp); 1302 } 1303 } 1304 1305 void 1306 tty_wakeup(struct tty *tp, int flags) 1307 { 1308 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL) 1309 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 1310 1311 if (flags & FWRITE) { 1312 cv_broadcast(&tp->t_outwait); 1313 selwakeup(&tp->t_outpoll); 1314 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0); 1315 } 1316 if (flags & FREAD) { 1317 cv_broadcast(&tp->t_inwait); 1318 selwakeup(&tp->t_inpoll); 1319 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0); 1320 } 1321 } 1322 1323 int 1324 tty_wait(struct tty *tp, struct cv *cv) 1325 { 1326 int error; 1327 int revokecnt = tp->t_revokecnt; 1328 1329 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1330 MPASS(!tty_gone(tp)); 1331 1332 error = cv_wait_sig(cv, tp->t_mtx); 1333 1334 /* Restart the system call when we may have been revoked. */ 1335 if (tp->t_revokecnt != revokecnt) 1336 return (ERESTART); 1337 1338 /* Bail out when the device slipped away. */ 1339 if (tty_gone(tp)) 1340 return (ENXIO); 1341 1342 return (error); 1343 } 1344 1345 int 1346 tty_timedwait(struct tty *tp, struct cv *cv, int hz) 1347 { 1348 int error; 1349 int revokecnt = tp->t_revokecnt; 1350 1351 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1352 MPASS(!tty_gone(tp)); 1353 1354 error = cv_timedwait_sig(cv, tp->t_mtx, hz); 1355 1356 /* Restart the system call when we may have been revoked. */ 1357 if (tp->t_revokecnt != revokecnt) 1358 return (ERESTART); 1359 1360 /* Bail out when the device slipped away. */ 1361 if (tty_gone(tp)) 1362 return (ENXIO); 1363 1364 return (error); 1365 } 1366 1367 void 1368 tty_flush(struct tty *tp, int flags) 1369 { 1370 if (flags & FWRITE) { 1371 tp->t_flags &= ~TF_HIWAT_OUT; 1372 ttyoutq_flush(&tp->t_outq); 1373 tty_wakeup(tp, FWRITE); 1374 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE); 1375 } 1376 if (flags & FREAD) { 1377 tty_hiwat_in_unblock(tp); 1378 ttyinq_flush(&tp->t_inq); 1379 ttydevsw_inwakeup(tp); 1380 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD); 1381 } 1382 } 1383 1384 void 1385 tty_set_winsize(struct tty *tp, const struct winsize *wsz) 1386 { 1387 1388 if (memcmp(&tp->t_winsize, wsz, sizeof(*wsz)) == 0) 1389 return; 1390 tp->t_winsize = *wsz; 1391 tty_signal_pgrp(tp, SIGWINCH); 1392 } 1393 1394 static int 1395 tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, 1396 struct thread *td) 1397 { 1398 int error; 1399 1400 switch (cmd) { 1401 /* 1402 * Modem commands. 1403 * The SER_* and TIOCM_* flags are the same, but one bit 1404 * shifted. I don't know why. 1405 */ 1406 case TIOCSDTR: 1407 ttydevsw_modem(tp, SER_DTR, 0); 1408 return (0); 1409 case TIOCCDTR: 1410 ttydevsw_modem(tp, 0, SER_DTR); 1411 return (0); 1412 case TIOCMSET: { 1413 int bits = *(int *)data; 1414 ttydevsw_modem(tp, 1415 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 1416 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1417 return (0); 1418 } 1419 case TIOCMBIS: { 1420 int bits = *(int *)data; 1421 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0); 1422 return (0); 1423 } 1424 case TIOCMBIC: { 1425 int bits = *(int *)data; 1426 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1427 return (0); 1428 } 1429 case TIOCMGET: 1430 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1); 1431 return (0); 1432 1433 case FIOASYNC: 1434 if (*(int *)data) 1435 tp->t_flags |= TF_ASYNC; 1436 else 1437 tp->t_flags &= ~TF_ASYNC; 1438 return (0); 1439 case FIONBIO: 1440 /* This device supports non-blocking operation. */ 1441 return (0); 1442 case FIONREAD: 1443 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq); 1444 return (0); 1445 case FIONWRITE: 1446 case TIOCOUTQ: 1447 *(int *)data = ttyoutq_bytesused(&tp->t_outq); 1448 return (0); 1449 case FIOSETOWN: 1450 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1451 /* Not allowed to set ownership. */ 1452 return (ENOTTY); 1453 1454 /* Temporarily unlock the TTY to set ownership. */ 1455 tty_unlock(tp); 1456 error = fsetown(*(int *)data, &tp->t_sigio); 1457 tty_lock(tp); 1458 return (error); 1459 case FIOGETOWN: 1460 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1461 /* Not allowed to set ownership. */ 1462 return (ENOTTY); 1463 1464 /* Get ownership. */ 1465 *(int *)data = fgetown(&tp->t_sigio); 1466 return (0); 1467 case TIOCGETA: 1468 /* Obtain terminal flags through tcgetattr(). */ 1469 *(struct termios*)data = tp->t_termios; 1470 return (0); 1471 case TIOCSETA: 1472 case TIOCSETAW: 1473 case TIOCSETAF: { 1474 struct termios *t = data; 1475 1476 /* 1477 * Who makes up these funny rules? According to POSIX, 1478 * input baud rate is set equal to the output baud rate 1479 * when zero. 1480 */ 1481 if (t->c_ispeed == 0) 1482 t->c_ispeed = t->c_ospeed; 1483 1484 /* Discard any unsupported bits. */ 1485 t->c_iflag &= TTYSUP_IFLAG; 1486 t->c_oflag &= TTYSUP_OFLAG; 1487 t->c_lflag &= TTYSUP_LFLAG; 1488 t->c_cflag &= TTYSUP_CFLAG; 1489 1490 /* Set terminal flags through tcsetattr(). */ 1491 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1492 error = tty_drain(tp); 1493 if (error) 1494 return (error); 1495 if (cmd == TIOCSETAF) 1496 tty_flush(tp, FREAD); 1497 } 1498 1499 /* 1500 * Only call param() when the flags really change. 1501 */ 1502 if ((t->c_cflag & CIGNORE) == 0 && 1503 (tp->t_termios.c_cflag != t->c_cflag || 1504 ((tp->t_termios.c_iflag ^ t->c_iflag) & 1505 (IXON|IXOFF|IXANY)) || 1506 tp->t_termios.c_ispeed != t->c_ispeed || 1507 tp->t_termios.c_ospeed != t->c_ospeed)) { 1508 error = ttydevsw_param(tp, t); 1509 if (error) 1510 return (error); 1511 1512 /* XXX: CLOCAL? */ 1513 1514 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE; 1515 tp->t_termios.c_ispeed = t->c_ispeed; 1516 tp->t_termios.c_ospeed = t->c_ospeed; 1517 1518 /* Baud rate has changed - update watermarks. */ 1519 tty_watermarks(tp); 1520 } 1521 1522 /* Copy new non-device driver parameters. */ 1523 tp->t_termios.c_iflag = t->c_iflag; 1524 tp->t_termios.c_oflag = t->c_oflag; 1525 tp->t_termios.c_lflag = t->c_lflag; 1526 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc); 1527 1528 ttydisc_optimize(tp); 1529 1530 if ((t->c_lflag & ICANON) == 0) { 1531 /* 1532 * When in non-canonical mode, wake up all 1533 * readers. Canonicalize any partial input. VMIN 1534 * and VTIME could also be adjusted. 1535 */ 1536 ttyinq_canonicalize(&tp->t_inq); 1537 tty_wakeup(tp, FREAD); 1538 } 1539 1540 /* 1541 * For packet mode: notify the PTY consumer that VSTOP 1542 * and VSTART may have been changed. 1543 */ 1544 if (tp->t_termios.c_iflag & IXON && 1545 tp->t_termios.c_cc[VSTOP] == CTRL('S') && 1546 tp->t_termios.c_cc[VSTART] == CTRL('Q')) 1547 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP); 1548 else 1549 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP); 1550 return (0); 1551 } 1552 case TIOCGETD: 1553 /* For compatibility - we only support TTYDISC. */ 1554 *(int *)data = TTYDISC; 1555 return (0); 1556 case TIOCGPGRP: 1557 if (!tty_is_ctty(tp, td->td_proc)) 1558 return (ENOTTY); 1559 1560 if (tp->t_pgrp != NULL) 1561 *(int *)data = tp->t_pgrp->pg_id; 1562 else 1563 *(int *)data = NO_PID; 1564 return (0); 1565 case TIOCGSID: 1566 if (!tty_is_ctty(tp, td->td_proc)) 1567 return (ENOTTY); 1568 1569 MPASS(tp->t_session); 1570 *(int *)data = tp->t_session->s_sid; 1571 return (0); 1572 case TIOCSCTTY: { 1573 struct proc *p = td->td_proc; 1574 1575 /* XXX: This looks awful. */ 1576 tty_unlock(tp); 1577 sx_xlock(&proctree_lock); 1578 tty_lock(tp); 1579 1580 if (!SESS_LEADER(p)) { 1581 /* Only the session leader may do this. */ 1582 sx_xunlock(&proctree_lock); 1583 return (EPERM); 1584 } 1585 1586 if (tp->t_session != NULL && tp->t_session == p->p_session) { 1587 /* This is already our controlling TTY. */ 1588 sx_xunlock(&proctree_lock); 1589 return (0); 1590 } 1591 1592 if (p->p_session->s_ttyp != NULL || 1593 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL && 1594 tp->t_session->s_ttyvp->v_type != VBAD)) { 1595 /* 1596 * There is already a relation between a TTY and 1597 * a session, or the caller is not the session 1598 * leader. 1599 * 1600 * Allow the TTY to be stolen when the vnode is 1601 * invalid, but the reference to the TTY is 1602 * still active. This allows immediate reuse of 1603 * TTYs of which the session leader has been 1604 * killed or the TTY revoked. 1605 */ 1606 sx_xunlock(&proctree_lock); 1607 return (EPERM); 1608 } 1609 1610 /* Connect the session to the TTY. */ 1611 tp->t_session = p->p_session; 1612 tp->t_session->s_ttyp = tp; 1613 tp->t_sessioncnt++; 1614 sx_xunlock(&proctree_lock); 1615 1616 /* Assign foreground process group. */ 1617 tp->t_pgrp = p->p_pgrp; 1618 PROC_LOCK(p); 1619 p->p_flag |= P_CONTROLT; 1620 PROC_UNLOCK(p); 1621 1622 return (0); 1623 } 1624 case TIOCSPGRP: { 1625 struct pgrp *pg; 1626 1627 /* 1628 * XXX: Temporarily unlock the TTY to locate the process 1629 * group. This code would be lot nicer if we would ever 1630 * decompose proctree_lock. 1631 */ 1632 tty_unlock(tp); 1633 sx_slock(&proctree_lock); 1634 pg = pgfind(*(int *)data); 1635 if (pg != NULL) 1636 PGRP_UNLOCK(pg); 1637 if (pg == NULL || pg->pg_session != td->td_proc->p_session) { 1638 sx_sunlock(&proctree_lock); 1639 tty_lock(tp); 1640 return (EPERM); 1641 } 1642 tty_lock(tp); 1643 1644 /* 1645 * Determine if this TTY is the controlling TTY after 1646 * relocking the TTY. 1647 */ 1648 if (!tty_is_ctty(tp, td->td_proc)) { 1649 sx_sunlock(&proctree_lock); 1650 return (ENOTTY); 1651 } 1652 tp->t_pgrp = pg; 1653 sx_sunlock(&proctree_lock); 1654 1655 /* Wake up the background process groups. */ 1656 cv_broadcast(&tp->t_bgwait); 1657 return (0); 1658 } 1659 case TIOCFLUSH: { 1660 int flags = *(int *)data; 1661 1662 if (flags == 0) 1663 flags = (FREAD|FWRITE); 1664 else 1665 flags &= (FREAD|FWRITE); 1666 tty_flush(tp, flags); 1667 return (0); 1668 } 1669 case TIOCDRAIN: 1670 /* Drain TTY output. */ 1671 return tty_drain(tp); 1672 case TIOCCONS: 1673 /* Set terminal as console TTY. */ 1674 if (*(int *)data) { 1675 error = priv_check(td, PRIV_TTY_CONSOLE); 1676 if (error) 1677 return (error); 1678 1679 /* 1680 * XXX: constty should really need to be locked! 1681 * XXX: allow disconnected constty's to be stolen! 1682 */ 1683 1684 if (constty == tp) 1685 return (0); 1686 if (constty != NULL) 1687 return (EBUSY); 1688 1689 tty_unlock(tp); 1690 constty_set(tp); 1691 tty_lock(tp); 1692 } else if (constty == tp) { 1693 constty_clear(); 1694 } 1695 return (0); 1696 case TIOCGWINSZ: 1697 /* Obtain window size. */ 1698 *(struct winsize*)data = tp->t_winsize; 1699 return (0); 1700 case TIOCSWINSZ: 1701 /* Set window size. */ 1702 tty_set_winsize(tp, data); 1703 return (0); 1704 case TIOCEXCL: 1705 tp->t_flags |= TF_EXCLUDE; 1706 return (0); 1707 case TIOCNXCL: 1708 tp->t_flags &= ~TF_EXCLUDE; 1709 return (0); 1710 case TIOCSTOP: 1711 tp->t_flags |= TF_STOPPED; 1712 ttydevsw_pktnotify(tp, TIOCPKT_STOP); 1713 return (0); 1714 case TIOCSTART: 1715 tp->t_flags &= ~TF_STOPPED; 1716 ttydevsw_outwakeup(tp); 1717 ttydevsw_pktnotify(tp, TIOCPKT_START); 1718 return (0); 1719 case TIOCSTAT: 1720 tty_info(tp); 1721 return (0); 1722 case TIOCSTI: 1723 if ((fflag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI)) 1724 return (EPERM); 1725 if (!tty_is_ctty(tp, td->td_proc) && 1726 priv_check(td, PRIV_TTY_STI)) 1727 return (EACCES); 1728 ttydisc_rint(tp, *(char *)data, 0); 1729 ttydisc_rint_done(tp); 1730 return (0); 1731 } 1732 1733 #ifdef COMPAT_43TTY 1734 return tty_ioctl_compat(tp, cmd, data, fflag, td); 1735 #else /* !COMPAT_43TTY */ 1736 return (ENOIOCTL); 1737 #endif /* COMPAT_43TTY */ 1738 } 1739 1740 int 1741 tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, struct thread *td) 1742 { 1743 int error; 1744 1745 tty_lock_assert(tp, MA_OWNED); 1746 1747 if (tty_gone(tp)) 1748 return (ENXIO); 1749 1750 error = ttydevsw_ioctl(tp, cmd, data, td); 1751 if (error == ENOIOCTL) 1752 error = tty_generic_ioctl(tp, cmd, data, fflag, td); 1753 1754 return (error); 1755 } 1756 1757 dev_t 1758 tty_udev(struct tty *tp) 1759 { 1760 if (tp->t_dev) 1761 return dev2udev(tp->t_dev); 1762 else 1763 return NODEV; 1764 } 1765 1766 int 1767 tty_checkoutq(struct tty *tp) 1768 { 1769 1770 /* 256 bytes should be enough to print a log message. */ 1771 return (ttyoutq_bytesleft(&tp->t_outq) >= 256); 1772 } 1773 1774 void 1775 tty_hiwat_in_block(struct tty *tp) 1776 { 1777 1778 if ((tp->t_flags & TF_HIWAT_IN) == 0 && 1779 tp->t_termios.c_iflag & IXOFF && 1780 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) { 1781 /* 1782 * Input flow control. Only enter the high watermark when we 1783 * can successfully store the VSTOP character. 1784 */ 1785 if (ttyoutq_write_nofrag(&tp->t_outq, 1786 &tp->t_termios.c_cc[VSTOP], 1) == 0) 1787 tp->t_flags |= TF_HIWAT_IN; 1788 } else { 1789 /* No input flow control. */ 1790 tp->t_flags |= TF_HIWAT_IN; 1791 } 1792 } 1793 1794 void 1795 tty_hiwat_in_unblock(struct tty *tp) 1796 { 1797 1798 if (tp->t_flags & TF_HIWAT_IN && 1799 tp->t_termios.c_iflag & IXOFF && 1800 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) { 1801 /* 1802 * Input flow control. Only leave the high watermark when we 1803 * can successfully store the VSTART character. 1804 */ 1805 if (ttyoutq_write_nofrag(&tp->t_outq, 1806 &tp->t_termios.c_cc[VSTART], 1) == 0) 1807 tp->t_flags &= ~TF_HIWAT_IN; 1808 } else { 1809 /* No input flow control. */ 1810 tp->t_flags &= ~TF_HIWAT_IN; 1811 } 1812 1813 if (!tty_gone(tp)) 1814 ttydevsw_inwakeup(tp); 1815 } 1816 1817 /* 1818 * TTY hooks interface. 1819 */ 1820 1821 static int 1822 ttyhook_defrint(struct tty *tp, char c, int flags) 1823 { 1824 1825 if (ttyhook_rint_bypass(tp, &c, 1) != 1) 1826 return (-1); 1827 1828 return (0); 1829 } 1830 1831 int 1832 ttyhook_register(struct tty **rtp, struct proc *p, int fd, 1833 struct ttyhook *th, void *softc) 1834 { 1835 struct tty *tp; 1836 struct file *fp; 1837 struct cdev *dev; 1838 struct cdevsw *cdp; 1839 struct filedesc *fdp; 1840 int error, ref; 1841 1842 /* Validate the file descriptor. */ 1843 if ((fdp = p->p_fd) == NULL) 1844 return (EBADF); 1845 1846 fp = fget_unlocked(fdp, fd); 1847 if (fp == NULL) 1848 return (EBADF); 1849 if (fp->f_ops == &badfileops) { 1850 error = EBADF; 1851 goto done1; 1852 } 1853 1854 #ifdef CAPABILITIES 1855 error = cap_funwrap(fp, CAP_TTYHOOK, &fp); 1856 if (error) 1857 goto done1; 1858 #endif 1859 1860 /* 1861 * Make sure the vnode is bound to a character device. 1862 * Unlocked check for the vnode type is ok there, because we 1863 * only shall prevent calling devvn_refthread on the file that 1864 * never has been opened over a character device. 1865 */ 1866 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) { 1867 error = EINVAL; 1868 goto done1; 1869 } 1870 1871 /* Make sure it is a TTY. */ 1872 cdp = devvn_refthread(fp->f_vnode, &dev, &ref); 1873 if (cdp == NULL) { 1874 error = ENXIO; 1875 goto done1; 1876 } 1877 if (dev != fp->f_data) { 1878 error = ENXIO; 1879 goto done2; 1880 } 1881 if (cdp != &ttydev_cdevsw) { 1882 error = ENOTTY; 1883 goto done2; 1884 } 1885 tp = dev->si_drv1; 1886 1887 /* Try to attach the hook to the TTY. */ 1888 error = EBUSY; 1889 tty_lock(tp); 1890 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0)); 1891 if (tp->t_flags & TF_HOOK) 1892 goto done3; 1893 1894 tp->t_flags |= TF_HOOK; 1895 tp->t_hook = th; 1896 tp->t_hooksoftc = softc; 1897 *rtp = tp; 1898 error = 0; 1899 1900 /* Maybe we can switch into bypass mode now. */ 1901 ttydisc_optimize(tp); 1902 1903 /* Silently convert rint() calls to rint_bypass() when possible. */ 1904 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass)) 1905 th->th_rint = ttyhook_defrint; 1906 1907 done3: tty_unlock(tp); 1908 done2: dev_relthread(dev, ref); 1909 done1: fdrop(fp, curthread); 1910 return (error); 1911 } 1912 1913 void 1914 ttyhook_unregister(struct tty *tp) 1915 { 1916 1917 tty_lock_assert(tp, MA_OWNED); 1918 MPASS(tp->t_flags & TF_HOOK); 1919 1920 /* Disconnect the hook. */ 1921 tp->t_flags &= ~TF_HOOK; 1922 tp->t_hook = NULL; 1923 1924 /* Maybe we need to leave bypass mode. */ 1925 ttydisc_optimize(tp); 1926 1927 /* Maybe deallocate the TTY as well. */ 1928 tty_rel_free(tp); 1929 } 1930 1931 /* 1932 * /dev/console handling. 1933 */ 1934 1935 static int 1936 ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 1937 { 1938 struct tty *tp; 1939 1940 /* System has no console device. */ 1941 if (dev_console_filename == NULL) 1942 return (ENXIO); 1943 1944 /* Look up corresponding TTY by device name. */ 1945 sx_slock(&tty_list_sx); 1946 TAILQ_FOREACH(tp, &tty_list, t_list) { 1947 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) { 1948 dev_console->si_drv1 = tp; 1949 break; 1950 } 1951 } 1952 sx_sunlock(&tty_list_sx); 1953 1954 /* System console has no TTY associated. */ 1955 if (dev_console->si_drv1 == NULL) 1956 return (ENXIO); 1957 1958 return (ttydev_open(dev, oflags, devtype, td)); 1959 } 1960 1961 static int 1962 ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag) 1963 { 1964 1965 log_console(uio); 1966 1967 return (ttydev_write(dev, uio, ioflag)); 1968 } 1969 1970 /* 1971 * /dev/console is a little different than normal TTY's. When opened, 1972 * it determines which TTY to use. When data gets written to it, it 1973 * will be logged in the kernel message buffer. 1974 */ 1975 static struct cdevsw ttyconsdev_cdevsw = { 1976 .d_version = D_VERSION, 1977 .d_open = ttyconsdev_open, 1978 .d_close = ttydev_close, 1979 .d_read = ttydev_read, 1980 .d_write = ttyconsdev_write, 1981 .d_ioctl = ttydev_ioctl, 1982 .d_kqfilter = ttydev_kqfilter, 1983 .d_poll = ttydev_poll, 1984 .d_mmap = ttydev_mmap, 1985 .d_name = "ttyconsdev", 1986 .d_flags = D_TTY, 1987 }; 1988 1989 static void 1990 ttyconsdev_init(void *unused) 1991 { 1992 1993 dev_console = make_dev_credf(MAKEDEV_ETERNAL, &ttyconsdev_cdevsw, 0, 1994 NULL, UID_ROOT, GID_WHEEL, 0600, "console"); 1995 } 1996 1997 SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL); 1998 1999 void 2000 ttyconsdev_select(const char *name) 2001 { 2002 2003 dev_console_filename = name; 2004 } 2005 2006 /* 2007 * Debugging routines. 2008 */ 2009 2010 #include "opt_ddb.h" 2011 #ifdef DDB 2012 #include <ddb/ddb.h> 2013 #include <ddb/db_sym.h> 2014 2015 static struct { 2016 int flag; 2017 char val; 2018 } ttystates[] = { 2019 #if 0 2020 { TF_NOPREFIX, 'N' }, 2021 #endif 2022 { TF_INITLOCK, 'I' }, 2023 { TF_CALLOUT, 'C' }, 2024 2025 /* Keep these together -> 'Oi' and 'Oo'. */ 2026 { TF_OPENED, 'O' }, 2027 { TF_OPENED_IN, 'i' }, 2028 { TF_OPENED_OUT, 'o' }, 2029 { TF_OPENED_CONS, 'c' }, 2030 2031 { TF_GONE, 'G' }, 2032 { TF_OPENCLOSE, 'B' }, 2033 { TF_ASYNC, 'Y' }, 2034 { TF_LITERAL, 'L' }, 2035 2036 /* Keep these together -> 'Hi' and 'Ho'. */ 2037 { TF_HIWAT, 'H' }, 2038 { TF_HIWAT_IN, 'i' }, 2039 { TF_HIWAT_OUT, 'o' }, 2040 2041 { TF_STOPPED, 'S' }, 2042 { TF_EXCLUDE, 'X' }, 2043 { TF_BYPASS, 'l' }, 2044 { TF_ZOMBIE, 'Z' }, 2045 { TF_HOOK, 's' }, 2046 2047 /* Keep these together -> 'bi' and 'bo'. */ 2048 { TF_BUSY, 'b' }, 2049 { TF_BUSY_IN, 'i' }, 2050 { TF_BUSY_OUT, 'o' }, 2051 2052 { 0, '\0'}, 2053 }; 2054 2055 #define TTY_FLAG_BITS \ 2056 "\20\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \ 2057 "\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \ 2058 "\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK" 2059 2060 #define DB_PRINTSYM(name, addr) \ 2061 db_printf("%s " #name ": ", sep); \ 2062 db_printsym((db_addr_t) addr, DB_STGY_ANY); \ 2063 db_printf("\n"); 2064 2065 static void 2066 _db_show_devsw(const char *sep, const struct ttydevsw *tsw) 2067 { 2068 db_printf("%sdevsw: ", sep); 2069 db_printsym((db_addr_t)tsw, DB_STGY_ANY); 2070 db_printf(" (%p)\n", tsw); 2071 DB_PRINTSYM(open, tsw->tsw_open); 2072 DB_PRINTSYM(close, tsw->tsw_close); 2073 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup); 2074 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup); 2075 DB_PRINTSYM(ioctl, tsw->tsw_ioctl); 2076 DB_PRINTSYM(param, tsw->tsw_param); 2077 DB_PRINTSYM(modem, tsw->tsw_modem); 2078 DB_PRINTSYM(mmap, tsw->tsw_mmap); 2079 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify); 2080 DB_PRINTSYM(free, tsw->tsw_free); 2081 } 2082 static void 2083 _db_show_hooks(const char *sep, const struct ttyhook *th) 2084 { 2085 db_printf("%shook: ", sep); 2086 db_printsym((db_addr_t)th, DB_STGY_ANY); 2087 db_printf(" (%p)\n", th); 2088 if (th == NULL) 2089 return; 2090 DB_PRINTSYM(rint, th->th_rint); 2091 DB_PRINTSYM(rint_bypass, th->th_rint_bypass); 2092 DB_PRINTSYM(rint_done, th->th_rint_done); 2093 DB_PRINTSYM(rint_poll, th->th_rint_poll); 2094 DB_PRINTSYM(getc_inject, th->th_getc_inject); 2095 DB_PRINTSYM(getc_capture, th->th_getc_capture); 2096 DB_PRINTSYM(getc_poll, th->th_getc_poll); 2097 DB_PRINTSYM(close, th->th_close); 2098 } 2099 2100 static void 2101 _db_show_termios(const char *name, const struct termios *t) 2102 { 2103 2104 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x " 2105 "lflag 0x%x ispeed %u ospeed %u\n", name, 2106 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag, 2107 t->c_ispeed, t->c_ospeed); 2108 } 2109 2110 /* DDB command to show TTY statistics. */ 2111 DB_SHOW_COMMAND(tty, db_show_tty) 2112 { 2113 struct tty *tp; 2114 2115 if (!have_addr) { 2116 db_printf("usage: show tty <addr>\n"); 2117 return; 2118 } 2119 tp = (struct tty *)addr; 2120 2121 db_printf("0x%p: %s\n", tp, tty_devname(tp)); 2122 db_printf("\tmtx: %p\n", tp->t_mtx); 2123 db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS); 2124 db_printf("\trevokecnt: %u\n", tp->t_revokecnt); 2125 2126 /* Buffering mechanisms. */ 2127 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u " 2128 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin, 2129 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end, 2130 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota); 2131 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n", 2132 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end, 2133 tp->t_outq.to_nblocks, tp->t_outq.to_quota); 2134 db_printf("\tinlow: %zu\n", tp->t_inlow); 2135 db_printf("\toutlow: %zu\n", tp->t_outlow); 2136 _db_show_termios("\ttermios", &tp->t_termios); 2137 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n", 2138 tp->t_winsize.ws_row, tp->t_winsize.ws_col, 2139 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel); 2140 db_printf("\tcolumn: %u\n", tp->t_column); 2141 db_printf("\twritepos: %u\n", tp->t_writepos); 2142 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags); 2143 2144 /* Init/lock-state devices. */ 2145 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in); 2146 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out); 2147 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in); 2148 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out); 2149 2150 /* Hooks */ 2151 _db_show_devsw("\t", tp->t_devsw); 2152 _db_show_hooks("\t", tp->t_hook); 2153 2154 /* Process info. */ 2155 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp, 2156 tp->t_pgrp ? tp->t_pgrp->pg_id : 0, 2157 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0); 2158 db_printf("\tsession: %p", tp->t_session); 2159 if (tp->t_session != NULL) 2160 db_printf(" count %u leader %p tty %p sid %d login %s", 2161 tp->t_session->s_count, tp->t_session->s_leader, 2162 tp->t_session->s_ttyp, tp->t_session->s_sid, 2163 tp->t_session->s_login); 2164 db_printf("\n"); 2165 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt); 2166 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc); 2167 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc); 2168 db_printf("\tdev: %p\n", tp->t_dev); 2169 } 2170 2171 /* DDB command to list TTYs. */ 2172 DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys) 2173 { 2174 struct tty *tp; 2175 size_t isiz, osiz; 2176 int i, j; 2177 2178 /* Make the output look like `pstat -t'. */ 2179 db_printf("PTR "); 2180 #if defined(__LP64__) 2181 db_printf(" "); 2182 #endif 2183 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW " 2184 "COL SESS PGID STATE\n"); 2185 2186 TAILQ_FOREACH(tp, &tty_list, t_list) { 2187 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE; 2188 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE; 2189 2190 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ", 2191 tp, 2192 tty_devname(tp), 2193 isiz, 2194 tp->t_inq.ti_linestart - tp->t_inq.ti_begin, 2195 tp->t_inq.ti_end - tp->t_inq.ti_linestart, 2196 isiz - tp->t_inlow, 2197 osiz, 2198 tp->t_outq.to_end - tp->t_outq.to_begin, 2199 osiz - tp->t_outlow, 2200 MIN(tp->t_column, 99999), 2201 tp->t_session ? tp->t_session->s_sid : 0, 2202 tp->t_pgrp ? tp->t_pgrp->pg_id : 0); 2203 2204 /* Flag bits. */ 2205 for (i = j = 0; ttystates[i].flag; i++) 2206 if (tp->t_flags & ttystates[i].flag) { 2207 db_printf("%c", ttystates[i].val); 2208 j++; 2209 } 2210 if (j == 0) 2211 db_printf("-"); 2212 db_printf("\n"); 2213 } 2214 } 2215 #endif /* DDB */ 2216