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/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 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, 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 */ 174 175 static __inline int 176 ttydev_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 } 188 189 static void 190 ttydev_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 */ 236 static int 237 ttydev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 238 { 239 struct tty *tp; 240 int error; 241 242 tp = dev->si_drv1; 243 error = 0; 244 tty_lock(tp); 245 if (tty_gone(tp)) { 246 /* Device is already gone. */ 247 tty_unlock(tp); 248 return (ENXIO); 249 } 250 251 /* 252 * Block when other processes are currently opening or closing 253 * the TTY. 254 */ 255 while (tp->t_flags & TF_OPENCLOSE) { 256 error = tty_wait(tp, &tp->t_dcdwait); 257 if (error != 0) { 258 tty_unlock(tp); 259 return (error); 260 } 261 } 262 tp->t_flags |= TF_OPENCLOSE; 263 264 /* 265 * Make sure the "tty" and "cua" device cannot be opened at the 266 * same time. 267 */ 268 if (TTY_CALLOUT(tp, dev)) { 269 if (tp->t_flags & TF_OPENED_IN) { 270 error = EBUSY; 271 goto done; 272 } 273 } else { 274 if (tp->t_flags & TF_OPENED_OUT) { 275 error = EBUSY; 276 goto done; 277 } 278 } 279 280 if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) { 281 error = EBUSY; 282 goto done; 283 } 284 285 if (!tty_opened(tp)) { 286 /* Set proper termios flags. */ 287 if (TTY_CALLOUT(tp, dev)) 288 tp->t_termios = tp->t_termios_init_out; 289 else 290 tp->t_termios = tp->t_termios_init_in; 291 ttydevsw_param(tp, &tp->t_termios); 292 /* Prevent modem control on callout devices and /dev/console. */ 293 if (TTY_CALLOUT(tp, dev) || dev == dev_console) 294 tp->t_termios.c_cflag |= CLOCAL; 295 296 ttydevsw_modem(tp, SER_DTR|SER_RTS, 0); 297 298 error = ttydevsw_open(tp); 299 if (error != 0) 300 goto done; 301 302 ttydisc_open(tp); 303 tty_watermarks(tp); /* XXXGL: drops lock */ 304 } 305 306 /* Wait for Carrier Detect. */ 307 if ((oflags & O_NONBLOCK) == 0 && 308 (tp->t_termios.c_cflag & CLOCAL) == 0) { 309 while ((ttydevsw_modem(tp, 0, 0) & SER_DCD) == 0) { 310 error = tty_wait(tp, &tp->t_dcdwait); 311 if (error != 0) 312 goto done; 313 } 314 } 315 316 if (dev == dev_console) 317 tp->t_flags |= TF_OPENED_CONS; 318 else if (TTY_CALLOUT(tp, dev)) 319 tp->t_flags |= TF_OPENED_OUT; 320 else 321 tp->t_flags |= TF_OPENED_IN; 322 323 done: tp->t_flags &= ~TF_OPENCLOSE; 324 cv_broadcast(&tp->t_dcdwait); 325 ttydev_leave(tp); 326 327 return (error); 328 } 329 330 static int 331 ttydev_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 332 { 333 struct tty *tp = dev->si_drv1; 334 335 tty_lock(tp); 336 337 /* 338 * Don't actually close the device if it is being used as the 339 * console. 340 */ 341 MPASS((tp->t_flags & TF_OPENED) != TF_OPENED); 342 if (dev == dev_console) 343 tp->t_flags &= ~TF_OPENED_CONS; 344 else 345 tp->t_flags &= ~(TF_OPENED_IN|TF_OPENED_OUT); 346 347 if (tp->t_flags & TF_OPENED) { 348 tty_unlock(tp); 349 return (0); 350 } 351 352 /* 353 * This can only be called once. The callin and the callout 354 * devices cannot be opened at the same time. 355 */ 356 tp->t_flags &= ~(TF_EXCLUDE|TF_STOPPED); 357 358 /* Properly wake up threads that are stuck - revoke(). */ 359 tp->t_revokecnt++; 360 tty_wakeup(tp, FREAD|FWRITE); 361 cv_broadcast(&tp->t_bgwait); 362 cv_broadcast(&tp->t_dcdwait); 363 364 ttydev_leave(tp); 365 366 return (0); 367 } 368 369 static __inline int 370 tty_is_ctty(struct tty *tp, struct proc *p) 371 { 372 tty_lock_assert(tp, MA_OWNED); 373 374 return (p->p_session == tp->t_session && p->p_flag & P_CONTROLT); 375 } 376 377 int 378 tty_wait_background(struct tty *tp, struct thread *td, int sig) 379 { 380 struct proc *p = td->td_proc; 381 struct pgrp *pg; 382 ksiginfo_t ksi; 383 int error; 384 385 MPASS(sig == SIGTTIN || sig == SIGTTOU); 386 tty_lock_assert(tp, MA_OWNED); 387 388 for (;;) { 389 PROC_LOCK(p); 390 /* 391 * The process should only sleep, when: 392 * - This terminal is the controling terminal 393 * - Its process group is not the foreground process 394 * group 395 * - The parent process isn't waiting for the child to 396 * exit 397 * - the signal to send to the process isn't masked 398 */ 399 if (!tty_is_ctty(tp, p) || p->p_pgrp == tp->t_pgrp) { 400 /* Allow the action to happen. */ 401 PROC_UNLOCK(p); 402 return (0); 403 } 404 405 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, sig) || 406 SIGISMEMBER(td->td_sigmask, sig)) { 407 /* Only allow them in write()/ioctl(). */ 408 PROC_UNLOCK(p); 409 return (sig == SIGTTOU ? 0 : EIO); 410 } 411 412 pg = p->p_pgrp; 413 if (p->p_flag & P_PPWAIT || pg->pg_jobc == 0) { 414 /* Don't allow the action to happen. */ 415 PROC_UNLOCK(p); 416 return (EIO); 417 } 418 PROC_UNLOCK(p); 419 420 /* 421 * Send the signal and sleep until we're the new 422 * foreground process group. 423 */ 424 if (sig != 0) { 425 ksiginfo_init(&ksi); 426 ksi.ksi_code = SI_KERNEL; 427 ksi.ksi_signo = sig; 428 sig = 0; 429 } 430 PGRP_LOCK(pg); 431 pgsignal(pg, ksi.ksi_signo, 1, &ksi); 432 PGRP_UNLOCK(pg); 433 434 error = tty_wait(tp, &tp->t_bgwait); 435 if (error) 436 return (error); 437 } 438 } 439 440 static int 441 ttydev_read(struct cdev *dev, struct uio *uio, int ioflag) 442 { 443 struct tty *tp = dev->si_drv1; 444 int error; 445 446 error = ttydev_enter(tp); 447 if (error) 448 goto done; 449 error = ttydisc_read(tp, uio, ioflag); 450 tty_unlock(tp); 451 452 /* 453 * The read() call should not throw an error when the device is 454 * being destroyed. Silently convert it to an EOF. 455 */ 456 done: if (error == ENXIO) 457 error = 0; 458 return (error); 459 } 460 461 static int 462 ttydev_write(struct cdev *dev, struct uio *uio, int ioflag) 463 { 464 struct tty *tp = dev->si_drv1; 465 int error; 466 467 error = ttydev_enter(tp); 468 if (error) 469 return (error); 470 471 if (tp->t_termios.c_lflag & TOSTOP) { 472 error = tty_wait_background(tp, curthread, SIGTTOU); 473 if (error) 474 goto done; 475 } 476 477 if (ioflag & IO_NDELAY && tp->t_flags & TF_BUSY_OUT) { 478 /* Allow non-blocking writes to bypass serialization. */ 479 error = ttydisc_write(tp, uio, ioflag); 480 } else { 481 /* Serialize write() calls. */ 482 while (tp->t_flags & TF_BUSY_OUT) { 483 error = tty_wait(tp, &tp->t_outserwait); 484 if (error) 485 goto done; 486 } 487 488 tp->t_flags |= TF_BUSY_OUT; 489 error = ttydisc_write(tp, uio, ioflag); 490 tp->t_flags &= ~TF_BUSY_OUT; 491 cv_signal(&tp->t_outserwait); 492 } 493 494 done: tty_unlock(tp); 495 return (error); 496 } 497 498 static int 499 ttydev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 500 struct thread *td) 501 { 502 struct tty *tp = dev->si_drv1; 503 int error; 504 505 error = ttydev_enter(tp); 506 if (error) 507 return (error); 508 509 switch (cmd) { 510 case TIOCCBRK: 511 case TIOCCONS: 512 case TIOCDRAIN: 513 case TIOCEXCL: 514 case TIOCFLUSH: 515 case TIOCNXCL: 516 case TIOCSBRK: 517 case TIOCSCTTY: 518 case TIOCSETA: 519 case TIOCSETAF: 520 case TIOCSETAW: 521 case TIOCSPGRP: 522 case TIOCSTART: 523 case TIOCSTAT: 524 case TIOCSTI: 525 case TIOCSTOP: 526 case TIOCSWINSZ: 527 #if 0 528 case TIOCSDRAINWAIT: 529 case TIOCSETD: 530 #endif 531 #ifdef COMPAT_43TTY 532 case TIOCLBIC: 533 case TIOCLBIS: 534 case TIOCLSET: 535 case TIOCSETC: 536 case OTIOCSETD: 537 case TIOCSETN: 538 case TIOCSETP: 539 case TIOCSLTC: 540 #endif /* COMPAT_43TTY */ 541 /* 542 * If the ioctl() causes the TTY to be modified, let it 543 * wait in the background. 544 */ 545 error = tty_wait_background(tp, curthread, SIGTTOU); 546 if (error) 547 goto done; 548 } 549 550 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 551 struct termios *old = &tp->t_termios; 552 struct termios *new = (struct termios *)data; 553 struct termios *lock = TTY_CALLOUT(tp, dev) ? 554 &tp->t_termios_lock_out : &tp->t_termios_lock_in; 555 int cc; 556 557 /* 558 * Lock state devices. Just overwrite the values of the 559 * commands that are currently in use. 560 */ 561 new->c_iflag = (old->c_iflag & lock->c_iflag) | 562 (new->c_iflag & ~lock->c_iflag); 563 new->c_oflag = (old->c_oflag & lock->c_oflag) | 564 (new->c_oflag & ~lock->c_oflag); 565 new->c_cflag = (old->c_cflag & lock->c_cflag) | 566 (new->c_cflag & ~lock->c_cflag); 567 new->c_lflag = (old->c_lflag & lock->c_lflag) | 568 (new->c_lflag & ~lock->c_lflag); 569 for (cc = 0; cc < NCCS; ++cc) 570 if (lock->c_cc[cc]) 571 new->c_cc[cc] = old->c_cc[cc]; 572 if (lock->c_ispeed) 573 new->c_ispeed = old->c_ispeed; 574 if (lock->c_ospeed) 575 new->c_ospeed = old->c_ospeed; 576 } 577 578 error = tty_ioctl(tp, cmd, data, fflag, td); 579 done: tty_unlock(tp); 580 581 return (error); 582 } 583 584 static int 585 ttydev_poll(struct cdev *dev, int events, struct thread *td) 586 { 587 struct tty *tp = dev->si_drv1; 588 int error, revents = 0; 589 590 error = ttydev_enter(tp); 591 if (error) 592 return ((events & (POLLIN|POLLRDNORM)) | POLLHUP); 593 594 if (events & (POLLIN|POLLRDNORM)) { 595 /* See if we can read something. */ 596 if (ttydisc_read_poll(tp) > 0) 597 revents |= events & (POLLIN|POLLRDNORM); 598 } 599 600 if (tp->t_flags & TF_ZOMBIE) { 601 /* Hangup flag on zombie state. */ 602 revents |= POLLHUP; 603 } else if (events & (POLLOUT|POLLWRNORM)) { 604 /* See if we can write something. */ 605 if (ttydisc_write_poll(tp) > 0) 606 revents |= events & (POLLOUT|POLLWRNORM); 607 } 608 609 if (revents == 0) { 610 if (events & (POLLIN|POLLRDNORM)) 611 selrecord(td, &tp->t_inpoll); 612 if (events & (POLLOUT|POLLWRNORM)) 613 selrecord(td, &tp->t_outpoll); 614 } 615 616 tty_unlock(tp); 617 618 return (revents); 619 } 620 621 static int 622 ttydev_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 623 int nprot, vm_memattr_t *memattr) 624 { 625 struct tty *tp = dev->si_drv1; 626 int error; 627 628 /* Handle mmap() through the driver. */ 629 630 error = ttydev_enter(tp); 631 if (error) 632 return (-1); 633 error = ttydevsw_mmap(tp, offset, paddr, nprot, memattr); 634 tty_unlock(tp); 635 636 return (error); 637 } 638 639 /* 640 * kqueue support. 641 */ 642 643 static void 644 tty_kqops_read_detach(struct knote *kn) 645 { 646 struct tty *tp = kn->kn_hook; 647 648 knlist_remove(&tp->t_inpoll.si_note, kn, 0); 649 } 650 651 static int 652 tty_kqops_read_event(struct knote *kn, long hint) 653 { 654 struct tty *tp = kn->kn_hook; 655 656 tty_lock_assert(tp, MA_OWNED); 657 658 if (tty_gone(tp) || tp->t_flags & TF_ZOMBIE) { 659 kn->kn_flags |= EV_EOF; 660 return (1); 661 } else { 662 kn->kn_data = ttydisc_read_poll(tp); 663 return (kn->kn_data > 0); 664 } 665 } 666 667 static void 668 tty_kqops_write_detach(struct knote *kn) 669 { 670 struct tty *tp = kn->kn_hook; 671 672 knlist_remove(&tp->t_outpoll.si_note, kn, 0); 673 } 674 675 static int 676 tty_kqops_write_event(struct knote *kn, long hint) 677 { 678 struct tty *tp = kn->kn_hook; 679 680 tty_lock_assert(tp, MA_OWNED); 681 682 if (tty_gone(tp)) { 683 kn->kn_flags |= EV_EOF; 684 return (1); 685 } else { 686 kn->kn_data = ttydisc_write_poll(tp); 687 return (kn->kn_data > 0); 688 } 689 } 690 691 static struct filterops tty_kqops_read = { 692 .f_isfd = 1, 693 .f_detach = tty_kqops_read_detach, 694 .f_event = tty_kqops_read_event, 695 }; 696 static struct filterops tty_kqops_write = { 697 .f_isfd = 1, 698 .f_detach = tty_kqops_write_detach, 699 .f_event = tty_kqops_write_event, 700 }; 701 702 static int 703 ttydev_kqfilter(struct cdev *dev, struct knote *kn) 704 { 705 struct tty *tp = dev->si_drv1; 706 int error; 707 708 error = ttydev_enter(tp); 709 if (error) 710 return (error); 711 712 switch (kn->kn_filter) { 713 case EVFILT_READ: 714 kn->kn_hook = tp; 715 kn->kn_fop = &tty_kqops_read; 716 knlist_add(&tp->t_inpoll.si_note, kn, 1); 717 break; 718 case EVFILT_WRITE: 719 kn->kn_hook = tp; 720 kn->kn_fop = &tty_kqops_write; 721 knlist_add(&tp->t_outpoll.si_note, kn, 1); 722 break; 723 default: 724 error = EINVAL; 725 break; 726 } 727 728 tty_unlock(tp); 729 return (error); 730 } 731 732 static struct cdevsw ttydev_cdevsw = { 733 .d_version = D_VERSION, 734 .d_open = ttydev_open, 735 .d_close = ttydev_close, 736 .d_read = ttydev_read, 737 .d_write = ttydev_write, 738 .d_ioctl = ttydev_ioctl, 739 .d_kqfilter = ttydev_kqfilter, 740 .d_poll = ttydev_poll, 741 .d_mmap = ttydev_mmap, 742 .d_name = "ttydev", 743 .d_flags = D_TTY, 744 }; 745 746 /* 747 * Init/lock-state devices 748 */ 749 750 static int 751 ttyil_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 752 { 753 struct tty *tp; 754 int error; 755 756 tp = dev->si_drv1; 757 error = 0; 758 tty_lock(tp); 759 if (tty_gone(tp)) 760 error = ENODEV; 761 tty_unlock(tp); 762 763 return (error); 764 } 765 766 static int 767 ttyil_close(struct cdev *dev, int flag, int mode, struct thread *td) 768 { 769 return (0); 770 } 771 772 static int 773 ttyil_rdwr(struct cdev *dev, struct uio *uio, int ioflag) 774 { 775 return (ENODEV); 776 } 777 778 static int 779 ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 780 struct thread *td) 781 { 782 struct tty *tp = dev->si_drv1; 783 int error; 784 785 tty_lock(tp); 786 if (tty_gone(tp)) { 787 error = ENODEV; 788 goto done; 789 } 790 791 error = ttydevsw_cioctl(tp, dev2unit(dev), cmd, data, td); 792 if (error != ENOIOCTL) 793 goto done; 794 error = 0; 795 796 switch (cmd) { 797 case TIOCGETA: 798 /* Obtain terminal flags through tcgetattr(). */ 799 *(struct termios*)data = *(struct termios*)dev->si_drv2; 800 break; 801 case TIOCSETA: 802 /* Set terminal flags through tcsetattr(). */ 803 error = priv_check(td, PRIV_TTY_SETA); 804 if (error) 805 break; 806 *(struct termios*)dev->si_drv2 = *(struct termios*)data; 807 break; 808 case TIOCGETD: 809 *(int *)data = TTYDISC; 810 break; 811 case TIOCGWINSZ: 812 bzero(data, sizeof(struct winsize)); 813 break; 814 default: 815 error = ENOTTY; 816 } 817 818 done: tty_unlock(tp); 819 return (error); 820 } 821 822 static struct cdevsw ttyil_cdevsw = { 823 .d_version = D_VERSION, 824 .d_open = ttyil_open, 825 .d_close = ttyil_close, 826 .d_read = ttyil_rdwr, 827 .d_write = ttyil_rdwr, 828 .d_ioctl = ttyil_ioctl, 829 .d_name = "ttyil", 830 .d_flags = D_TTY, 831 }; 832 833 static void 834 tty_init_termios(struct tty *tp) 835 { 836 struct termios *t = &tp->t_termios_init_in; 837 838 t->c_cflag = TTYDEF_CFLAG; 839 t->c_iflag = TTYDEF_IFLAG; 840 t->c_lflag = TTYDEF_LFLAG; 841 t->c_oflag = TTYDEF_OFLAG; 842 t->c_ispeed = TTYDEF_SPEED; 843 t->c_ospeed = TTYDEF_SPEED; 844 memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars); 845 846 tp->t_termios_init_out = *t; 847 } 848 849 void 850 tty_init_console(struct tty *tp, speed_t s) 851 { 852 struct termios *ti = &tp->t_termios_init_in; 853 struct termios *to = &tp->t_termios_init_out; 854 855 if (s != 0) { 856 ti->c_ispeed = ti->c_ospeed = s; 857 to->c_ispeed = to->c_ospeed = s; 858 } 859 860 ti->c_cflag |= CLOCAL; 861 to->c_cflag |= CLOCAL; 862 } 863 864 /* 865 * Standard device routine implementations, mostly meant for 866 * pseudo-terminal device drivers. When a driver creates a new terminal 867 * device class, missing routines are patched. 868 */ 869 870 static int 871 ttydevsw_defopen(struct tty *tp) 872 { 873 874 return (0); 875 } 876 877 static void 878 ttydevsw_defclose(struct tty *tp) 879 { 880 } 881 882 static void 883 ttydevsw_defoutwakeup(struct tty *tp) 884 { 885 886 panic("Terminal device has output, while not implemented"); 887 } 888 889 static void 890 ttydevsw_definwakeup(struct tty *tp) 891 { 892 } 893 894 static int 895 ttydevsw_defioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td) 896 { 897 898 return (ENOIOCTL); 899 } 900 901 static int 902 ttydevsw_defcioctl(struct tty *tp, int unit, u_long cmd, caddr_t data, struct thread *td) 903 { 904 905 return (ENOIOCTL); 906 } 907 908 static int 909 ttydevsw_defparam(struct tty *tp, struct termios *t) 910 { 911 912 /* 913 * Allow the baud rate to be adjusted for pseudo-devices, but at 914 * least restrict it to 115200 to prevent excessive buffer 915 * usage. Also disallow 0, to prevent foot shooting. 916 */ 917 if (t->c_ispeed < B50) 918 t->c_ispeed = B50; 919 else if (t->c_ispeed > B115200) 920 t->c_ispeed = B115200; 921 if (t->c_ospeed < B50) 922 t->c_ospeed = B50; 923 else if (t->c_ospeed > B115200) 924 t->c_ospeed = B115200; 925 t->c_cflag |= CREAD; 926 927 return (0); 928 } 929 930 static int 931 ttydevsw_defmodem(struct tty *tp, int sigon, int sigoff) 932 { 933 934 /* Simulate a carrier to make the TTY layer happy. */ 935 return (SER_DCD); 936 } 937 938 static int 939 ttydevsw_defmmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t *paddr, 940 int nprot, vm_memattr_t *memattr) 941 { 942 943 return (-1); 944 } 945 946 static void 947 ttydevsw_defpktnotify(struct tty *tp, char event) 948 { 949 } 950 951 static void 952 ttydevsw_deffree(void *softc) 953 { 954 955 panic("Terminal device freed without a free-handler"); 956 } 957 958 /* 959 * TTY allocation and deallocation. TTY devices can be deallocated when 960 * the driver doesn't use it anymore, when the TTY isn't a session's 961 * controlling TTY and when the device node isn't opened through devfs. 962 */ 963 964 struct tty * 965 tty_alloc(struct ttydevsw *tsw, void *sc) 966 { 967 968 return (tty_alloc_mutex(tsw, sc, NULL)); 969 } 970 971 struct tty * 972 tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex) 973 { 974 struct tty *tp; 975 976 /* Make sure the driver defines all routines. */ 977 #define PATCH_FUNC(x) do { \ 978 if (tsw->tsw_ ## x == NULL) \ 979 tsw->tsw_ ## x = ttydevsw_def ## x; \ 980 } while (0) 981 PATCH_FUNC(open); 982 PATCH_FUNC(close); 983 PATCH_FUNC(outwakeup); 984 PATCH_FUNC(inwakeup); 985 PATCH_FUNC(ioctl); 986 PATCH_FUNC(cioctl); 987 PATCH_FUNC(param); 988 PATCH_FUNC(modem); 989 PATCH_FUNC(mmap); 990 PATCH_FUNC(pktnotify); 991 PATCH_FUNC(free); 992 #undef PATCH_FUNC 993 994 tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO); 995 tp->t_devsw = tsw; 996 tp->t_devswsoftc = sc; 997 tp->t_flags = tsw->tsw_flags; 998 999 tty_init_termios(tp); 1000 1001 cv_init(&tp->t_inwait, "ttyin"); 1002 cv_init(&tp->t_outwait, "ttyout"); 1003 cv_init(&tp->t_outserwait, "ttyosr"); 1004 cv_init(&tp->t_bgwait, "ttybg"); 1005 cv_init(&tp->t_dcdwait, "ttydcd"); 1006 1007 /* Allow drivers to use a custom mutex to lock the TTY. */ 1008 if (mutex != NULL) { 1009 tp->t_mtx = mutex; 1010 } else { 1011 tp->t_mtx = &tp->t_mtxobj; 1012 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF); 1013 } 1014 1015 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx); 1016 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx); 1017 1018 return (tp); 1019 } 1020 1021 static void 1022 tty_dealloc(void *arg) 1023 { 1024 struct tty *tp = arg; 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 sx_xlock(&tty_list_sx); 1068 TAILQ_REMOVE(&tty_list, tp, t_list); 1069 tty_list_count--; 1070 sx_xunlock(&tty_list_sx); 1071 destroy_dev_sched_cb(dev, tty_dealloc, tp); 1072 } 1073 } 1074 1075 void 1076 tty_rel_pgrp(struct tty *tp, struct pgrp *pg) 1077 { 1078 MPASS(tp->t_sessioncnt > 0); 1079 tty_lock_assert(tp, MA_OWNED); 1080 1081 if (tp->t_pgrp == pg) 1082 tp->t_pgrp = NULL; 1083 1084 tty_unlock(tp); 1085 } 1086 1087 void 1088 tty_rel_sess(struct tty *tp, struct session *sess) 1089 { 1090 MPASS(tp->t_sessioncnt > 0); 1091 1092 /* Current session has left. */ 1093 if (tp->t_session == sess) { 1094 tp->t_session = NULL; 1095 MPASS(tp->t_pgrp == NULL); 1096 } 1097 tp->t_sessioncnt--; 1098 tty_rel_free(tp); 1099 } 1100 1101 void 1102 tty_rel_gone(struct tty *tp) 1103 { 1104 MPASS(!tty_gone(tp)); 1105 1106 /* Simulate carrier removal. */ 1107 ttydisc_modem(tp, 0); 1108 1109 /* Wake up all blocked threads. */ 1110 tty_wakeup(tp, FREAD|FWRITE); 1111 cv_broadcast(&tp->t_bgwait); 1112 cv_broadcast(&tp->t_dcdwait); 1113 1114 tp->t_flags |= TF_GONE; 1115 tty_rel_free(tp); 1116 } 1117 1118 /* 1119 * Exposing information about current TTY's through sysctl 1120 */ 1121 1122 static void 1123 tty_to_xtty(struct tty *tp, struct xtty *xt) 1124 { 1125 tty_lock_assert(tp, MA_OWNED); 1126 1127 xt->xt_size = sizeof(struct xtty); 1128 xt->xt_insize = ttyinq_getsize(&tp->t_inq); 1129 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq); 1130 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq); 1131 xt->xt_inlow = tp->t_inlow; 1132 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq); 1133 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq); 1134 xt->xt_outlow = tp->t_outlow; 1135 xt->xt_column = tp->t_column; 1136 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1137 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0; 1138 xt->xt_flags = tp->t_flags; 1139 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV; 1140 } 1141 1142 static int 1143 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 1144 { 1145 unsigned long lsize; 1146 struct xtty *xtlist, *xt; 1147 struct tty *tp; 1148 int error; 1149 1150 sx_slock(&tty_list_sx); 1151 lsize = tty_list_count * sizeof(struct xtty); 1152 if (lsize == 0) { 1153 sx_sunlock(&tty_list_sx); 1154 return (0); 1155 } 1156 1157 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK); 1158 1159 TAILQ_FOREACH(tp, &tty_list, t_list) { 1160 tty_lock(tp); 1161 tty_to_xtty(tp, xt); 1162 tty_unlock(tp); 1163 xt++; 1164 } 1165 sx_sunlock(&tty_list_sx); 1166 1167 error = SYSCTL_OUT(req, xtlist, lsize); 1168 free(xtlist, M_TTY); 1169 return (error); 1170 } 1171 1172 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 1173 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs"); 1174 1175 /* 1176 * Device node creation. Device has been set up, now we can expose it to 1177 * the user. 1178 */ 1179 1180 int 1181 tty_makedevf(struct tty *tp, struct ucred *cred, int flags, 1182 const char *fmt, ...) 1183 { 1184 va_list ap; 1185 struct make_dev_args args; 1186 struct cdev *dev, *init, *lock, *cua, *cinit, *clock; 1187 const char *prefix = "tty"; 1188 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */ 1189 uid_t uid; 1190 gid_t gid; 1191 mode_t mode; 1192 int error; 1193 1194 /* Remove "tty" prefix from devices like PTY's. */ 1195 if (tp->t_flags & TF_NOPREFIX) 1196 prefix = ""; 1197 1198 va_start(ap, fmt); 1199 vsnrprintf(name, sizeof name, 32, fmt, ap); 1200 va_end(ap); 1201 1202 if (cred == NULL) { 1203 /* System device. */ 1204 uid = UID_ROOT; 1205 gid = GID_WHEEL; 1206 mode = S_IRUSR|S_IWUSR; 1207 } else { 1208 /* User device. */ 1209 uid = cred->cr_ruid; 1210 gid = GID_TTY; 1211 mode = S_IRUSR|S_IWUSR|S_IWGRP; 1212 } 1213 1214 flags = flags & TTYMK_CLONING ? MAKEDEV_REF : 0; 1215 flags |= MAKEDEV_CHECKNAME; 1216 1217 /* Master call-in device. */ 1218 make_dev_args_init(&args); 1219 args.mda_flags = flags; 1220 args.mda_devsw = &ttydev_cdevsw; 1221 args.mda_cr = cred; 1222 args.mda_uid = uid; 1223 args.mda_gid = gid; 1224 args.mda_mode = mode; 1225 args.mda_si_drv1 = tp; 1226 error = make_dev_s(&args, &dev, "%s%s", prefix, name); 1227 if (error != 0) 1228 return (error); 1229 tp->t_dev = dev; 1230 1231 init = lock = cua = cinit = clock = NULL; 1232 1233 /* Slave call-in devices. */ 1234 if (tp->t_flags & TF_INITLOCK) { 1235 args.mda_devsw = &ttyil_cdevsw; 1236 args.mda_unit = TTYUNIT_INIT; 1237 args.mda_si_drv1 = tp; 1238 args.mda_si_drv2 = &tp->t_termios_init_in; 1239 error = make_dev_s(&args, &init, "%s%s.init", prefix, name); 1240 if (error != 0) 1241 goto fail; 1242 dev_depends(dev, init); 1243 1244 args.mda_unit = TTYUNIT_LOCK; 1245 args.mda_si_drv2 = &tp->t_termios_lock_in; 1246 error = make_dev_s(&args, &lock, "%s%s.lock", prefix, name); 1247 if (error != 0) 1248 goto fail; 1249 dev_depends(dev, lock); 1250 } 1251 1252 /* Call-out devices. */ 1253 if (tp->t_flags & TF_CALLOUT) { 1254 make_dev_args_init(&args); 1255 args.mda_flags = flags; 1256 args.mda_devsw = &ttydev_cdevsw; 1257 args.mda_cr = cred; 1258 args.mda_uid = UID_UUCP; 1259 args.mda_gid = GID_DIALER; 1260 args.mda_mode = 0660; 1261 args.mda_unit = TTYUNIT_CALLOUT; 1262 args.mda_si_drv1 = tp; 1263 error = make_dev_s(&args, &cua, "cua%s", name); 1264 if (error != 0) 1265 goto fail; 1266 dev_depends(dev, cua); 1267 1268 /* Slave call-out devices. */ 1269 if (tp->t_flags & TF_INITLOCK) { 1270 args.mda_devsw = &ttyil_cdevsw; 1271 args.mda_unit = TTYUNIT_CALLOUT | TTYUNIT_INIT; 1272 args.mda_si_drv2 = &tp->t_termios_init_out; 1273 error = make_dev_s(&args, &cinit, "cua%s.init", name); 1274 if (error != 0) 1275 goto fail; 1276 dev_depends(dev, cinit); 1277 1278 args.mda_unit = TTYUNIT_CALLOUT | TTYUNIT_LOCK; 1279 args.mda_si_drv2 = &tp->t_termios_lock_out; 1280 error = make_dev_s(&args, &clock, "cua%s.lock", name); 1281 if (error != 0) 1282 goto fail; 1283 dev_depends(dev, clock); 1284 } 1285 } 1286 1287 sx_xlock(&tty_list_sx); 1288 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 1289 tty_list_count++; 1290 sx_xunlock(&tty_list_sx); 1291 1292 return (0); 1293 1294 fail: 1295 destroy_dev(dev); 1296 if (init) 1297 destroy_dev(init); 1298 if (lock) 1299 destroy_dev(lock); 1300 if (cinit) 1301 destroy_dev(cinit); 1302 if (clock) 1303 destroy_dev(clock); 1304 1305 return (error); 1306 } 1307 1308 /* 1309 * Signalling processes. 1310 */ 1311 1312 void 1313 tty_signal_sessleader(struct tty *tp, int sig) 1314 { 1315 struct proc *p; 1316 1317 tty_lock_assert(tp, MA_OWNED); 1318 MPASS(sig >= 1 && sig < NSIG); 1319 1320 /* Make signals start output again. */ 1321 tp->t_flags &= ~TF_STOPPED; 1322 1323 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) { 1324 p = tp->t_session->s_leader; 1325 PROC_LOCK(p); 1326 kern_psignal(p, sig); 1327 PROC_UNLOCK(p); 1328 } 1329 } 1330 1331 void 1332 tty_signal_pgrp(struct tty *tp, int sig) 1333 { 1334 ksiginfo_t ksi; 1335 1336 tty_lock_assert(tp, MA_OWNED); 1337 MPASS(sig >= 1 && sig < NSIG); 1338 1339 /* Make signals start output again. */ 1340 tp->t_flags &= ~TF_STOPPED; 1341 1342 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO)) 1343 tty_info(tp); 1344 if (tp->t_pgrp != NULL) { 1345 ksiginfo_init(&ksi); 1346 ksi.ksi_signo = sig; 1347 ksi.ksi_code = SI_KERNEL; 1348 PGRP_LOCK(tp->t_pgrp); 1349 pgsignal(tp->t_pgrp, sig, 1, &ksi); 1350 PGRP_UNLOCK(tp->t_pgrp); 1351 } 1352 } 1353 1354 void 1355 tty_wakeup(struct tty *tp, int flags) 1356 { 1357 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL) 1358 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 1359 1360 if (flags & FWRITE) { 1361 cv_broadcast(&tp->t_outwait); 1362 selwakeup(&tp->t_outpoll); 1363 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0); 1364 } 1365 if (flags & FREAD) { 1366 cv_broadcast(&tp->t_inwait); 1367 selwakeup(&tp->t_inpoll); 1368 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0); 1369 } 1370 } 1371 1372 int 1373 tty_wait(struct tty *tp, struct cv *cv) 1374 { 1375 int error; 1376 int revokecnt = tp->t_revokecnt; 1377 1378 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1379 MPASS(!tty_gone(tp)); 1380 1381 error = cv_wait_sig(cv, tp->t_mtx); 1382 1383 /* Bail out when the device slipped away. */ 1384 if (tty_gone(tp)) 1385 return (ENXIO); 1386 1387 /* Restart the system call when we may have been revoked. */ 1388 if (tp->t_revokecnt != revokecnt) 1389 return (ERESTART); 1390 1391 return (error); 1392 } 1393 1394 int 1395 tty_timedwait(struct tty *tp, struct cv *cv, int hz) 1396 { 1397 int error; 1398 int revokecnt = tp->t_revokecnt; 1399 1400 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1401 MPASS(!tty_gone(tp)); 1402 1403 error = cv_timedwait_sig(cv, tp->t_mtx, hz); 1404 1405 /* Bail out when the device slipped away. */ 1406 if (tty_gone(tp)) 1407 return (ENXIO); 1408 1409 /* Restart the system call when we may have been revoked. */ 1410 if (tp->t_revokecnt != revokecnt) 1411 return (ERESTART); 1412 1413 return (error); 1414 } 1415 1416 void 1417 tty_flush(struct tty *tp, int flags) 1418 { 1419 if (flags & FWRITE) { 1420 tp->t_flags &= ~TF_HIWAT_OUT; 1421 ttyoutq_flush(&tp->t_outq); 1422 tty_wakeup(tp, FWRITE); 1423 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE); 1424 } 1425 if (flags & FREAD) { 1426 tty_hiwat_in_unblock(tp); 1427 ttyinq_flush(&tp->t_inq); 1428 ttydevsw_inwakeup(tp); 1429 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD); 1430 } 1431 } 1432 1433 void 1434 tty_set_winsize(struct tty *tp, const struct winsize *wsz) 1435 { 1436 1437 if (memcmp(&tp->t_winsize, wsz, sizeof(*wsz)) == 0) 1438 return; 1439 tp->t_winsize = *wsz; 1440 tty_signal_pgrp(tp, SIGWINCH); 1441 } 1442 1443 static int 1444 tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, 1445 struct thread *td) 1446 { 1447 int error; 1448 1449 switch (cmd) { 1450 /* 1451 * Modem commands. 1452 * The SER_* and TIOCM_* flags are the same, but one bit 1453 * shifted. I don't know why. 1454 */ 1455 case TIOCSDTR: 1456 ttydevsw_modem(tp, SER_DTR, 0); 1457 return (0); 1458 case TIOCCDTR: 1459 ttydevsw_modem(tp, 0, SER_DTR); 1460 return (0); 1461 case TIOCMSET: { 1462 int bits = *(int *)data; 1463 ttydevsw_modem(tp, 1464 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 1465 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1466 return (0); 1467 } 1468 case TIOCMBIS: { 1469 int bits = *(int *)data; 1470 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0); 1471 return (0); 1472 } 1473 case TIOCMBIC: { 1474 int bits = *(int *)data; 1475 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1476 return (0); 1477 } 1478 case TIOCMGET: 1479 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1); 1480 return (0); 1481 1482 case FIOASYNC: 1483 if (*(int *)data) 1484 tp->t_flags |= TF_ASYNC; 1485 else 1486 tp->t_flags &= ~TF_ASYNC; 1487 return (0); 1488 case FIONBIO: 1489 /* This device supports non-blocking operation. */ 1490 return (0); 1491 case FIONREAD: 1492 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq); 1493 return (0); 1494 case FIONWRITE: 1495 case TIOCOUTQ: 1496 *(int *)data = ttyoutq_bytesused(&tp->t_outq); 1497 return (0); 1498 case FIOSETOWN: 1499 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1500 /* Not allowed to set ownership. */ 1501 return (ENOTTY); 1502 1503 /* Temporarily unlock the TTY to set ownership. */ 1504 tty_unlock(tp); 1505 error = fsetown(*(int *)data, &tp->t_sigio); 1506 tty_lock(tp); 1507 return (error); 1508 case FIOGETOWN: 1509 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1510 /* Not allowed to set ownership. */ 1511 return (ENOTTY); 1512 1513 /* Get ownership. */ 1514 *(int *)data = fgetown(&tp->t_sigio); 1515 return (0); 1516 case TIOCGETA: 1517 /* Obtain terminal flags through tcgetattr(). */ 1518 *(struct termios*)data = tp->t_termios; 1519 return (0); 1520 case TIOCSETA: 1521 case TIOCSETAW: 1522 case TIOCSETAF: { 1523 struct termios *t = data; 1524 1525 /* 1526 * Who makes up these funny rules? According to POSIX, 1527 * input baud rate is set equal to the output baud rate 1528 * when zero. 1529 */ 1530 if (t->c_ispeed == 0) 1531 t->c_ispeed = t->c_ospeed; 1532 1533 /* Discard any unsupported bits. */ 1534 t->c_iflag &= TTYSUP_IFLAG; 1535 t->c_oflag &= TTYSUP_OFLAG; 1536 t->c_lflag &= TTYSUP_LFLAG; 1537 t->c_cflag &= TTYSUP_CFLAG; 1538 1539 /* Set terminal flags through tcsetattr(). */ 1540 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1541 error = tty_drain(tp, 0); 1542 if (error) 1543 return (error); 1544 if (cmd == TIOCSETAF) 1545 tty_flush(tp, FREAD); 1546 } 1547 1548 /* 1549 * Only call param() when the flags really change. 1550 */ 1551 if ((t->c_cflag & CIGNORE) == 0 && 1552 (tp->t_termios.c_cflag != t->c_cflag || 1553 ((tp->t_termios.c_iflag ^ t->c_iflag) & 1554 (IXON|IXOFF|IXANY)) || 1555 tp->t_termios.c_ispeed != t->c_ispeed || 1556 tp->t_termios.c_ospeed != t->c_ospeed)) { 1557 error = ttydevsw_param(tp, t); 1558 if (error) 1559 return (error); 1560 1561 /* XXX: CLOCAL? */ 1562 1563 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE; 1564 tp->t_termios.c_ispeed = t->c_ispeed; 1565 tp->t_termios.c_ospeed = t->c_ospeed; 1566 1567 /* Baud rate has changed - update watermarks. */ 1568 tty_watermarks(tp); 1569 } 1570 1571 /* Copy new non-device driver parameters. */ 1572 tp->t_termios.c_iflag = t->c_iflag; 1573 tp->t_termios.c_oflag = t->c_oflag; 1574 tp->t_termios.c_lflag = t->c_lflag; 1575 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc); 1576 1577 ttydisc_optimize(tp); 1578 1579 if ((t->c_lflag & ICANON) == 0) { 1580 /* 1581 * When in non-canonical mode, wake up all 1582 * readers. Canonicalize any partial input. VMIN 1583 * and VTIME could also be adjusted. 1584 */ 1585 ttyinq_canonicalize(&tp->t_inq); 1586 tty_wakeup(tp, FREAD); 1587 } 1588 1589 /* 1590 * For packet mode: notify the PTY consumer that VSTOP 1591 * and VSTART may have been changed. 1592 */ 1593 if (tp->t_termios.c_iflag & IXON && 1594 tp->t_termios.c_cc[VSTOP] == CTRL('S') && 1595 tp->t_termios.c_cc[VSTART] == CTRL('Q')) 1596 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP); 1597 else 1598 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP); 1599 return (0); 1600 } 1601 case TIOCGETD: 1602 /* For compatibility - we only support TTYDISC. */ 1603 *(int *)data = TTYDISC; 1604 return (0); 1605 case TIOCGPGRP: 1606 if (!tty_is_ctty(tp, td->td_proc)) 1607 return (ENOTTY); 1608 1609 if (tp->t_pgrp != NULL) 1610 *(int *)data = tp->t_pgrp->pg_id; 1611 else 1612 *(int *)data = NO_PID; 1613 return (0); 1614 case TIOCGSID: 1615 if (!tty_is_ctty(tp, td->td_proc)) 1616 return (ENOTTY); 1617 1618 MPASS(tp->t_session); 1619 *(int *)data = tp->t_session->s_sid; 1620 return (0); 1621 case TIOCSCTTY: { 1622 struct proc *p = td->td_proc; 1623 1624 /* XXX: This looks awful. */ 1625 tty_unlock(tp); 1626 sx_xlock(&proctree_lock); 1627 tty_lock(tp); 1628 1629 if (!SESS_LEADER(p)) { 1630 /* Only the session leader may do this. */ 1631 sx_xunlock(&proctree_lock); 1632 return (EPERM); 1633 } 1634 1635 if (tp->t_session != NULL && tp->t_session == p->p_session) { 1636 /* This is already our controlling TTY. */ 1637 sx_xunlock(&proctree_lock); 1638 return (0); 1639 } 1640 1641 if (p->p_session->s_ttyp != NULL || 1642 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL && 1643 tp->t_session->s_ttyvp->v_type != VBAD)) { 1644 /* 1645 * There is already a relation between a TTY and 1646 * a session, or the caller is not the session 1647 * leader. 1648 * 1649 * Allow the TTY to be stolen when the vnode is 1650 * invalid, but the reference to the TTY is 1651 * still active. This allows immediate reuse of 1652 * TTYs of which the session leader has been 1653 * killed or the TTY revoked. 1654 */ 1655 sx_xunlock(&proctree_lock); 1656 return (EPERM); 1657 } 1658 1659 /* Connect the session to the TTY. */ 1660 tp->t_session = p->p_session; 1661 tp->t_session->s_ttyp = tp; 1662 tp->t_sessioncnt++; 1663 sx_xunlock(&proctree_lock); 1664 1665 /* Assign foreground process group. */ 1666 tp->t_pgrp = p->p_pgrp; 1667 PROC_LOCK(p); 1668 p->p_flag |= P_CONTROLT; 1669 PROC_UNLOCK(p); 1670 1671 return (0); 1672 } 1673 case TIOCSPGRP: { 1674 struct pgrp *pg; 1675 1676 /* 1677 * XXX: Temporarily unlock the TTY to locate the process 1678 * group. This code would be lot nicer if we would ever 1679 * decompose proctree_lock. 1680 */ 1681 tty_unlock(tp); 1682 sx_slock(&proctree_lock); 1683 pg = pgfind(*(int *)data); 1684 if (pg != NULL) 1685 PGRP_UNLOCK(pg); 1686 if (pg == NULL || pg->pg_session != td->td_proc->p_session) { 1687 sx_sunlock(&proctree_lock); 1688 tty_lock(tp); 1689 return (EPERM); 1690 } 1691 tty_lock(tp); 1692 1693 /* 1694 * Determine if this TTY is the controlling TTY after 1695 * relocking the TTY. 1696 */ 1697 if (!tty_is_ctty(tp, td->td_proc)) { 1698 sx_sunlock(&proctree_lock); 1699 return (ENOTTY); 1700 } 1701 tp->t_pgrp = pg; 1702 sx_sunlock(&proctree_lock); 1703 1704 /* Wake up the background process groups. */ 1705 cv_broadcast(&tp->t_bgwait); 1706 return (0); 1707 } 1708 case TIOCFLUSH: { 1709 int flags = *(int *)data; 1710 1711 if (flags == 0) 1712 flags = (FREAD|FWRITE); 1713 else 1714 flags &= (FREAD|FWRITE); 1715 tty_flush(tp, flags); 1716 return (0); 1717 } 1718 case TIOCDRAIN: 1719 /* Drain TTY output. */ 1720 return tty_drain(tp, 0); 1721 case TIOCCONS: 1722 /* Set terminal as console TTY. */ 1723 if (*(int *)data) { 1724 error = priv_check(td, PRIV_TTY_CONSOLE); 1725 if (error) 1726 return (error); 1727 1728 /* 1729 * XXX: constty should really need to be locked! 1730 * XXX: allow disconnected constty's to be stolen! 1731 */ 1732 1733 if (constty == tp) 1734 return (0); 1735 if (constty != NULL) 1736 return (EBUSY); 1737 1738 tty_unlock(tp); 1739 constty_set(tp); 1740 tty_lock(tp); 1741 } else if (constty == tp) { 1742 constty_clear(); 1743 } 1744 return (0); 1745 case TIOCGWINSZ: 1746 /* Obtain window size. */ 1747 *(struct winsize*)data = tp->t_winsize; 1748 return (0); 1749 case TIOCSWINSZ: 1750 /* Set window size. */ 1751 tty_set_winsize(tp, data); 1752 return (0); 1753 case TIOCEXCL: 1754 tp->t_flags |= TF_EXCLUDE; 1755 return (0); 1756 case TIOCNXCL: 1757 tp->t_flags &= ~TF_EXCLUDE; 1758 return (0); 1759 case TIOCSTOP: 1760 tp->t_flags |= TF_STOPPED; 1761 ttydevsw_pktnotify(tp, TIOCPKT_STOP); 1762 return (0); 1763 case TIOCSTART: 1764 tp->t_flags &= ~TF_STOPPED; 1765 ttydevsw_outwakeup(tp); 1766 ttydevsw_pktnotify(tp, TIOCPKT_START); 1767 return (0); 1768 case TIOCSTAT: 1769 tty_info(tp); 1770 return (0); 1771 case TIOCSTI: 1772 if ((fflag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI)) 1773 return (EPERM); 1774 if (!tty_is_ctty(tp, td->td_proc) && 1775 priv_check(td, PRIV_TTY_STI)) 1776 return (EACCES); 1777 ttydisc_rint(tp, *(char *)data, 0); 1778 ttydisc_rint_done(tp); 1779 return (0); 1780 } 1781 1782 #ifdef COMPAT_43TTY 1783 return tty_ioctl_compat(tp, cmd, data, fflag, td); 1784 #else /* !COMPAT_43TTY */ 1785 return (ENOIOCTL); 1786 #endif /* COMPAT_43TTY */ 1787 } 1788 1789 int 1790 tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, struct thread *td) 1791 { 1792 int error; 1793 1794 tty_lock_assert(tp, MA_OWNED); 1795 1796 if (tty_gone(tp)) 1797 return (ENXIO); 1798 1799 error = ttydevsw_ioctl(tp, cmd, data, td); 1800 if (error == ENOIOCTL) 1801 error = tty_generic_ioctl(tp, cmd, data, fflag, td); 1802 1803 return (error); 1804 } 1805 1806 dev_t 1807 tty_udev(struct tty *tp) 1808 { 1809 if (tp->t_dev) 1810 return dev2udev(tp->t_dev); 1811 else 1812 return NODEV; 1813 } 1814 1815 int 1816 tty_checkoutq(struct tty *tp) 1817 { 1818 1819 /* 256 bytes should be enough to print a log message. */ 1820 return (ttyoutq_bytesleft(&tp->t_outq) >= 256); 1821 } 1822 1823 void 1824 tty_hiwat_in_block(struct tty *tp) 1825 { 1826 1827 if ((tp->t_flags & TF_HIWAT_IN) == 0 && 1828 tp->t_termios.c_iflag & IXOFF && 1829 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) { 1830 /* 1831 * Input flow control. Only enter the high watermark when we 1832 * can successfully store the VSTOP character. 1833 */ 1834 if (ttyoutq_write_nofrag(&tp->t_outq, 1835 &tp->t_termios.c_cc[VSTOP], 1) == 0) 1836 tp->t_flags |= TF_HIWAT_IN; 1837 } else { 1838 /* No input flow control. */ 1839 tp->t_flags |= TF_HIWAT_IN; 1840 } 1841 } 1842 1843 void 1844 tty_hiwat_in_unblock(struct tty *tp) 1845 { 1846 1847 if (tp->t_flags & TF_HIWAT_IN && 1848 tp->t_termios.c_iflag & IXOFF && 1849 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) { 1850 /* 1851 * Input flow control. Only leave the high watermark when we 1852 * can successfully store the VSTART character. 1853 */ 1854 if (ttyoutq_write_nofrag(&tp->t_outq, 1855 &tp->t_termios.c_cc[VSTART], 1) == 0) 1856 tp->t_flags &= ~TF_HIWAT_IN; 1857 } else { 1858 /* No input flow control. */ 1859 tp->t_flags &= ~TF_HIWAT_IN; 1860 } 1861 1862 if (!tty_gone(tp)) 1863 ttydevsw_inwakeup(tp); 1864 } 1865 1866 /* 1867 * TTY hooks interface. 1868 */ 1869 1870 static int 1871 ttyhook_defrint(struct tty *tp, char c, int flags) 1872 { 1873 1874 if (ttyhook_rint_bypass(tp, &c, 1) != 1) 1875 return (-1); 1876 1877 return (0); 1878 } 1879 1880 int 1881 ttyhook_register(struct tty **rtp, struct proc *p, int fd, 1882 struct ttyhook *th, void *softc) 1883 { 1884 struct tty *tp; 1885 struct file *fp; 1886 struct cdev *dev; 1887 struct cdevsw *cdp; 1888 struct filedesc *fdp; 1889 cap_rights_t rights; 1890 int error, ref; 1891 1892 /* Validate the file descriptor. */ 1893 fdp = p->p_fd; 1894 error = fget_unlocked(fdp, fd, cap_rights_init(&rights, CAP_TTYHOOK), 1895 &fp, NULL); 1896 if (error != 0) 1897 return (error); 1898 if (fp->f_ops == &badfileops) { 1899 error = EBADF; 1900 goto done1; 1901 } 1902 1903 /* 1904 * Make sure the vnode is bound to a character device. 1905 * Unlocked check for the vnode type is ok there, because we 1906 * only shall prevent calling devvn_refthread on the file that 1907 * never has been opened over a character device. 1908 */ 1909 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) { 1910 error = EINVAL; 1911 goto done1; 1912 } 1913 1914 /* Make sure it is a TTY. */ 1915 cdp = devvn_refthread(fp->f_vnode, &dev, &ref); 1916 if (cdp == NULL) { 1917 error = ENXIO; 1918 goto done1; 1919 } 1920 if (dev != fp->f_data) { 1921 error = ENXIO; 1922 goto done2; 1923 } 1924 if (cdp != &ttydev_cdevsw) { 1925 error = ENOTTY; 1926 goto done2; 1927 } 1928 tp = dev->si_drv1; 1929 1930 /* Try to attach the hook to the TTY. */ 1931 error = EBUSY; 1932 tty_lock(tp); 1933 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0)); 1934 if (tp->t_flags & TF_HOOK) 1935 goto done3; 1936 1937 tp->t_flags |= TF_HOOK; 1938 tp->t_hook = th; 1939 tp->t_hooksoftc = softc; 1940 *rtp = tp; 1941 error = 0; 1942 1943 /* Maybe we can switch into bypass mode now. */ 1944 ttydisc_optimize(tp); 1945 1946 /* Silently convert rint() calls to rint_bypass() when possible. */ 1947 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass)) 1948 th->th_rint = ttyhook_defrint; 1949 1950 done3: tty_unlock(tp); 1951 done2: dev_relthread(dev, ref); 1952 done1: fdrop(fp, curthread); 1953 return (error); 1954 } 1955 1956 void 1957 ttyhook_unregister(struct tty *tp) 1958 { 1959 1960 tty_lock_assert(tp, MA_OWNED); 1961 MPASS(tp->t_flags & TF_HOOK); 1962 1963 /* Disconnect the hook. */ 1964 tp->t_flags &= ~TF_HOOK; 1965 tp->t_hook = NULL; 1966 1967 /* Maybe we need to leave bypass mode. */ 1968 ttydisc_optimize(tp); 1969 1970 /* Maybe deallocate the TTY as well. */ 1971 tty_rel_free(tp); 1972 } 1973 1974 /* 1975 * /dev/console handling. 1976 */ 1977 1978 static int 1979 ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 1980 { 1981 struct tty *tp; 1982 1983 /* System has no console device. */ 1984 if (dev_console_filename == NULL) 1985 return (ENXIO); 1986 1987 /* Look up corresponding TTY by device name. */ 1988 sx_slock(&tty_list_sx); 1989 TAILQ_FOREACH(tp, &tty_list, t_list) { 1990 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) { 1991 dev_console->si_drv1 = tp; 1992 break; 1993 } 1994 } 1995 sx_sunlock(&tty_list_sx); 1996 1997 /* System console has no TTY associated. */ 1998 if (dev_console->si_drv1 == NULL) 1999 return (ENXIO); 2000 2001 return (ttydev_open(dev, oflags, devtype, td)); 2002 } 2003 2004 static int 2005 ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag) 2006 { 2007 2008 log_console(uio); 2009 2010 return (ttydev_write(dev, uio, ioflag)); 2011 } 2012 2013 /* 2014 * /dev/console is a little different than normal TTY's. When opened, 2015 * it determines which TTY to use. When data gets written to it, it 2016 * will be logged in the kernel message buffer. 2017 */ 2018 static struct cdevsw ttyconsdev_cdevsw = { 2019 .d_version = D_VERSION, 2020 .d_open = ttyconsdev_open, 2021 .d_close = ttydev_close, 2022 .d_read = ttydev_read, 2023 .d_write = ttyconsdev_write, 2024 .d_ioctl = ttydev_ioctl, 2025 .d_kqfilter = ttydev_kqfilter, 2026 .d_poll = ttydev_poll, 2027 .d_mmap = ttydev_mmap, 2028 .d_name = "ttyconsdev", 2029 .d_flags = D_TTY, 2030 }; 2031 2032 static void 2033 ttyconsdev_init(void *unused) 2034 { 2035 2036 dev_console = make_dev_credf(MAKEDEV_ETERNAL, &ttyconsdev_cdevsw, 0, 2037 NULL, UID_ROOT, GID_WHEEL, 0600, "console"); 2038 } 2039 2040 SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL); 2041 2042 void 2043 ttyconsdev_select(const char *name) 2044 { 2045 2046 dev_console_filename = name; 2047 } 2048 2049 /* 2050 * Debugging routines. 2051 */ 2052 2053 #include "opt_ddb.h" 2054 #ifdef DDB 2055 #include <ddb/ddb.h> 2056 #include <ddb/db_sym.h> 2057 2058 static struct { 2059 int flag; 2060 char val; 2061 } ttystates[] = { 2062 #if 0 2063 { TF_NOPREFIX, 'N' }, 2064 #endif 2065 { TF_INITLOCK, 'I' }, 2066 { TF_CALLOUT, 'C' }, 2067 2068 /* Keep these together -> 'Oi' and 'Oo'. */ 2069 { TF_OPENED, 'O' }, 2070 { TF_OPENED_IN, 'i' }, 2071 { TF_OPENED_OUT, 'o' }, 2072 { TF_OPENED_CONS, 'c' }, 2073 2074 { TF_GONE, 'G' }, 2075 { TF_OPENCLOSE, 'B' }, 2076 { TF_ASYNC, 'Y' }, 2077 { TF_LITERAL, 'L' }, 2078 2079 /* Keep these together -> 'Hi' and 'Ho'. */ 2080 { TF_HIWAT, 'H' }, 2081 { TF_HIWAT_IN, 'i' }, 2082 { TF_HIWAT_OUT, 'o' }, 2083 2084 { TF_STOPPED, 'S' }, 2085 { TF_EXCLUDE, 'X' }, 2086 { TF_BYPASS, 'l' }, 2087 { TF_ZOMBIE, 'Z' }, 2088 { TF_HOOK, 's' }, 2089 2090 /* Keep these together -> 'bi' and 'bo'. */ 2091 { TF_BUSY, 'b' }, 2092 { TF_BUSY_IN, 'i' }, 2093 { TF_BUSY_OUT, 'o' }, 2094 2095 { 0, '\0'}, 2096 }; 2097 2098 #define TTY_FLAG_BITS \ 2099 "\20\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \ 2100 "\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \ 2101 "\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK" 2102 2103 #define DB_PRINTSYM(name, addr) \ 2104 db_printf("%s " #name ": ", sep); \ 2105 db_printsym((db_addr_t) addr, DB_STGY_ANY); \ 2106 db_printf("\n"); 2107 2108 static void 2109 _db_show_devsw(const char *sep, const struct ttydevsw *tsw) 2110 { 2111 db_printf("%sdevsw: ", sep); 2112 db_printsym((db_addr_t)tsw, DB_STGY_ANY); 2113 db_printf(" (%p)\n", tsw); 2114 DB_PRINTSYM(open, tsw->tsw_open); 2115 DB_PRINTSYM(close, tsw->tsw_close); 2116 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup); 2117 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup); 2118 DB_PRINTSYM(ioctl, tsw->tsw_ioctl); 2119 DB_PRINTSYM(param, tsw->tsw_param); 2120 DB_PRINTSYM(modem, tsw->tsw_modem); 2121 DB_PRINTSYM(mmap, tsw->tsw_mmap); 2122 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify); 2123 DB_PRINTSYM(free, tsw->tsw_free); 2124 } 2125 static void 2126 _db_show_hooks(const char *sep, const struct ttyhook *th) 2127 { 2128 db_printf("%shook: ", sep); 2129 db_printsym((db_addr_t)th, DB_STGY_ANY); 2130 db_printf(" (%p)\n", th); 2131 if (th == NULL) 2132 return; 2133 DB_PRINTSYM(rint, th->th_rint); 2134 DB_PRINTSYM(rint_bypass, th->th_rint_bypass); 2135 DB_PRINTSYM(rint_done, th->th_rint_done); 2136 DB_PRINTSYM(rint_poll, th->th_rint_poll); 2137 DB_PRINTSYM(getc_inject, th->th_getc_inject); 2138 DB_PRINTSYM(getc_capture, th->th_getc_capture); 2139 DB_PRINTSYM(getc_poll, th->th_getc_poll); 2140 DB_PRINTSYM(close, th->th_close); 2141 } 2142 2143 static void 2144 _db_show_termios(const char *name, const struct termios *t) 2145 { 2146 2147 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x " 2148 "lflag 0x%x ispeed %u ospeed %u\n", name, 2149 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag, 2150 t->c_ispeed, t->c_ospeed); 2151 } 2152 2153 /* DDB command to show TTY statistics. */ 2154 DB_SHOW_COMMAND(tty, db_show_tty) 2155 { 2156 struct tty *tp; 2157 2158 if (!have_addr) { 2159 db_printf("usage: show tty <addr>\n"); 2160 return; 2161 } 2162 tp = (struct tty *)addr; 2163 2164 db_printf("0x%p: %s\n", tp, tty_devname(tp)); 2165 db_printf("\tmtx: %p\n", tp->t_mtx); 2166 db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS); 2167 db_printf("\trevokecnt: %u\n", tp->t_revokecnt); 2168 2169 /* Buffering mechanisms. */ 2170 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u " 2171 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin, 2172 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end, 2173 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota); 2174 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n", 2175 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end, 2176 tp->t_outq.to_nblocks, tp->t_outq.to_quota); 2177 db_printf("\tinlow: %zu\n", tp->t_inlow); 2178 db_printf("\toutlow: %zu\n", tp->t_outlow); 2179 _db_show_termios("\ttermios", &tp->t_termios); 2180 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n", 2181 tp->t_winsize.ws_row, tp->t_winsize.ws_col, 2182 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel); 2183 db_printf("\tcolumn: %u\n", tp->t_column); 2184 db_printf("\twritepos: %u\n", tp->t_writepos); 2185 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags); 2186 2187 /* Init/lock-state devices. */ 2188 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in); 2189 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out); 2190 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in); 2191 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out); 2192 2193 /* Hooks */ 2194 _db_show_devsw("\t", tp->t_devsw); 2195 _db_show_hooks("\t", tp->t_hook); 2196 2197 /* Process info. */ 2198 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp, 2199 tp->t_pgrp ? tp->t_pgrp->pg_id : 0, 2200 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0); 2201 db_printf("\tsession: %p", tp->t_session); 2202 if (tp->t_session != NULL) 2203 db_printf(" count %u leader %p tty %p sid %d login %s", 2204 tp->t_session->s_count, tp->t_session->s_leader, 2205 tp->t_session->s_ttyp, tp->t_session->s_sid, 2206 tp->t_session->s_login); 2207 db_printf("\n"); 2208 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt); 2209 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc); 2210 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc); 2211 db_printf("\tdev: %p\n", tp->t_dev); 2212 } 2213 2214 /* DDB command to list TTYs. */ 2215 DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys) 2216 { 2217 struct tty *tp; 2218 size_t isiz, osiz; 2219 int i, j; 2220 2221 /* Make the output look like `pstat -t'. */ 2222 db_printf("PTR "); 2223 #if defined(__LP64__) 2224 db_printf(" "); 2225 #endif 2226 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW " 2227 "COL SESS PGID STATE\n"); 2228 2229 TAILQ_FOREACH(tp, &tty_list, t_list) { 2230 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE; 2231 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE; 2232 2233 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ", 2234 tp, 2235 tty_devname(tp), 2236 isiz, 2237 tp->t_inq.ti_linestart - tp->t_inq.ti_begin, 2238 tp->t_inq.ti_end - tp->t_inq.ti_linestart, 2239 isiz - tp->t_inlow, 2240 osiz, 2241 tp->t_outq.to_end - tp->t_outq.to_begin, 2242 osiz - tp->t_outlow, 2243 MIN(tp->t_column, 99999), 2244 tp->t_session ? tp->t_session->s_sid : 0, 2245 tp->t_pgrp ? tp->t_pgrp->pg_id : 0); 2246 2247 /* Flag bits. */ 2248 for (i = j = 0; ttystates[i].flag; i++) 2249 if (tp->t_flags & ttystates[i].flag) { 2250 db_printf("%c", ttystates[i].val); 2251 j++; 2252 } 2253 if (j == 0) 2254 db_printf("-"); 2255 db_printf("\n"); 2256 } 2257 } 2258 #endif /* DDB */ 2259