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 || ttydevsw_busy(tp)) { 136 ttydevsw_outwakeup(tp); 137 /* Could be handled synchronously. */ 138 bytesused = ttyoutq_bytesused(&tp->t_outq); 139 if (bytesused == 0 && !ttydevsw_busy(tp)) 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 static bool 959 ttydevsw_defbusy(struct tty *tp __unused) 960 { 961 962 return (FALSE); 963 } 964 965 /* 966 * TTY allocation and deallocation. TTY devices can be deallocated when 967 * the driver doesn't use it anymore, when the TTY isn't a session's 968 * controlling TTY and when the device node isn't opened through devfs. 969 */ 970 971 struct tty * 972 tty_alloc(struct ttydevsw *tsw, void *sc) 973 { 974 975 return (tty_alloc_mutex(tsw, sc, NULL)); 976 } 977 978 struct tty * 979 tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex) 980 { 981 struct tty *tp; 982 983 /* Make sure the driver defines all routines. */ 984 #define PATCH_FUNC(x) do { \ 985 if (tsw->tsw_ ## x == NULL) \ 986 tsw->tsw_ ## x = ttydevsw_def ## x; \ 987 } while (0) 988 PATCH_FUNC(open); 989 PATCH_FUNC(close); 990 PATCH_FUNC(outwakeup); 991 PATCH_FUNC(inwakeup); 992 PATCH_FUNC(ioctl); 993 PATCH_FUNC(cioctl); 994 PATCH_FUNC(param); 995 PATCH_FUNC(modem); 996 PATCH_FUNC(mmap); 997 PATCH_FUNC(pktnotify); 998 PATCH_FUNC(free); 999 PATCH_FUNC(busy); 1000 #undef PATCH_FUNC 1001 1002 tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO); 1003 tp->t_devsw = tsw; 1004 tp->t_devswsoftc = sc; 1005 tp->t_flags = tsw->tsw_flags; 1006 1007 tty_init_termios(tp); 1008 1009 cv_init(&tp->t_inwait, "ttyin"); 1010 cv_init(&tp->t_outwait, "ttyout"); 1011 cv_init(&tp->t_outserwait, "ttyosr"); 1012 cv_init(&tp->t_bgwait, "ttybg"); 1013 cv_init(&tp->t_dcdwait, "ttydcd"); 1014 1015 /* Allow drivers to use a custom mutex to lock the TTY. */ 1016 if (mutex != NULL) { 1017 tp->t_mtx = mutex; 1018 } else { 1019 tp->t_mtx = &tp->t_mtxobj; 1020 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF); 1021 } 1022 1023 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx); 1024 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx); 1025 1026 return (tp); 1027 } 1028 1029 static void 1030 tty_dealloc(void *arg) 1031 { 1032 struct tty *tp = arg; 1033 1034 /* Make sure we haven't leaked buffers. */ 1035 MPASS(ttyinq_getsize(&tp->t_inq) == 0); 1036 MPASS(ttyoutq_getsize(&tp->t_outq) == 0); 1037 1038 seldrain(&tp->t_inpoll); 1039 seldrain(&tp->t_outpoll); 1040 knlist_destroy(&tp->t_inpoll.si_note); 1041 knlist_destroy(&tp->t_outpoll.si_note); 1042 1043 cv_destroy(&tp->t_inwait); 1044 cv_destroy(&tp->t_outwait); 1045 cv_destroy(&tp->t_bgwait); 1046 cv_destroy(&tp->t_dcdwait); 1047 cv_destroy(&tp->t_outserwait); 1048 1049 if (tp->t_mtx == &tp->t_mtxobj) 1050 mtx_destroy(&tp->t_mtxobj); 1051 ttydevsw_free(tp); 1052 free(tp, M_TTY); 1053 } 1054 1055 static void 1056 tty_rel_free(struct tty *tp) 1057 { 1058 struct cdev *dev; 1059 1060 tty_lock_assert(tp, MA_OWNED); 1061 1062 #define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE) 1063 if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) { 1064 /* TTY is still in use. */ 1065 tty_unlock(tp); 1066 return; 1067 } 1068 1069 /* TTY can be deallocated. */ 1070 dev = tp->t_dev; 1071 tp->t_dev = NULL; 1072 tty_unlock(tp); 1073 1074 if (dev != NULL) { 1075 sx_xlock(&tty_list_sx); 1076 TAILQ_REMOVE(&tty_list, tp, t_list); 1077 tty_list_count--; 1078 sx_xunlock(&tty_list_sx); 1079 destroy_dev_sched_cb(dev, tty_dealloc, tp); 1080 } 1081 } 1082 1083 void 1084 tty_rel_pgrp(struct tty *tp, struct pgrp *pg) 1085 { 1086 MPASS(tp->t_sessioncnt > 0); 1087 tty_lock_assert(tp, MA_OWNED); 1088 1089 if (tp->t_pgrp == pg) 1090 tp->t_pgrp = NULL; 1091 1092 tty_unlock(tp); 1093 } 1094 1095 void 1096 tty_rel_sess(struct tty *tp, struct session *sess) 1097 { 1098 MPASS(tp->t_sessioncnt > 0); 1099 1100 /* Current session has left. */ 1101 if (tp->t_session == sess) { 1102 tp->t_session = NULL; 1103 MPASS(tp->t_pgrp == NULL); 1104 } 1105 tp->t_sessioncnt--; 1106 tty_rel_free(tp); 1107 } 1108 1109 void 1110 tty_rel_gone(struct tty *tp) 1111 { 1112 MPASS(!tty_gone(tp)); 1113 1114 /* Simulate carrier removal. */ 1115 ttydisc_modem(tp, 0); 1116 1117 /* Wake up all blocked threads. */ 1118 tty_wakeup(tp, FREAD|FWRITE); 1119 cv_broadcast(&tp->t_bgwait); 1120 cv_broadcast(&tp->t_dcdwait); 1121 1122 tp->t_flags |= TF_GONE; 1123 tty_rel_free(tp); 1124 } 1125 1126 /* 1127 * Exposing information about current TTY's through sysctl 1128 */ 1129 1130 static void 1131 tty_to_xtty(struct tty *tp, struct xtty *xt) 1132 { 1133 tty_lock_assert(tp, MA_OWNED); 1134 1135 xt->xt_size = sizeof(struct xtty); 1136 xt->xt_insize = ttyinq_getsize(&tp->t_inq); 1137 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq); 1138 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq); 1139 xt->xt_inlow = tp->t_inlow; 1140 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq); 1141 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq); 1142 xt->xt_outlow = tp->t_outlow; 1143 xt->xt_column = tp->t_column; 1144 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1145 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0; 1146 xt->xt_flags = tp->t_flags; 1147 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV; 1148 } 1149 1150 static int 1151 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 1152 { 1153 unsigned long lsize; 1154 struct xtty *xtlist, *xt; 1155 struct tty *tp; 1156 int error; 1157 1158 sx_slock(&tty_list_sx); 1159 lsize = tty_list_count * sizeof(struct xtty); 1160 if (lsize == 0) { 1161 sx_sunlock(&tty_list_sx); 1162 return (0); 1163 } 1164 1165 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK); 1166 1167 TAILQ_FOREACH(tp, &tty_list, t_list) { 1168 tty_lock(tp); 1169 tty_to_xtty(tp, xt); 1170 tty_unlock(tp); 1171 xt++; 1172 } 1173 sx_sunlock(&tty_list_sx); 1174 1175 error = SYSCTL_OUT(req, xtlist, lsize); 1176 free(xtlist, M_TTY); 1177 return (error); 1178 } 1179 1180 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 1181 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs"); 1182 1183 /* 1184 * Device node creation. Device has been set up, now we can expose it to 1185 * the user. 1186 */ 1187 1188 int 1189 tty_makedevf(struct tty *tp, struct ucred *cred, int flags, 1190 const char *fmt, ...) 1191 { 1192 va_list ap; 1193 struct make_dev_args args; 1194 struct cdev *dev, *init, *lock, *cua, *cinit, *clock; 1195 const char *prefix = "tty"; 1196 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */ 1197 uid_t uid; 1198 gid_t gid; 1199 mode_t mode; 1200 int error; 1201 1202 /* Remove "tty" prefix from devices like PTY's. */ 1203 if (tp->t_flags & TF_NOPREFIX) 1204 prefix = ""; 1205 1206 va_start(ap, fmt); 1207 vsnrprintf(name, sizeof name, 32, fmt, ap); 1208 va_end(ap); 1209 1210 if (cred == NULL) { 1211 /* System device. */ 1212 uid = UID_ROOT; 1213 gid = GID_WHEEL; 1214 mode = S_IRUSR|S_IWUSR; 1215 } else { 1216 /* User device. */ 1217 uid = cred->cr_ruid; 1218 gid = GID_TTY; 1219 mode = S_IRUSR|S_IWUSR|S_IWGRP; 1220 } 1221 1222 flags = flags & TTYMK_CLONING ? MAKEDEV_REF : 0; 1223 flags |= MAKEDEV_CHECKNAME; 1224 1225 /* Master call-in device. */ 1226 make_dev_args_init(&args); 1227 args.mda_flags = flags; 1228 args.mda_devsw = &ttydev_cdevsw; 1229 args.mda_cr = cred; 1230 args.mda_uid = uid; 1231 args.mda_gid = gid; 1232 args.mda_mode = mode; 1233 args.mda_si_drv1 = tp; 1234 error = make_dev_s(&args, &dev, "%s%s", prefix, name); 1235 if (error != 0) 1236 return (error); 1237 tp->t_dev = dev; 1238 1239 init = lock = cua = cinit = clock = NULL; 1240 1241 /* Slave call-in devices. */ 1242 if (tp->t_flags & TF_INITLOCK) { 1243 args.mda_devsw = &ttyil_cdevsw; 1244 args.mda_unit = TTYUNIT_INIT; 1245 args.mda_si_drv1 = tp; 1246 args.mda_si_drv2 = &tp->t_termios_init_in; 1247 error = make_dev_s(&args, &init, "%s%s.init", prefix, name); 1248 if (error != 0) 1249 goto fail; 1250 dev_depends(dev, init); 1251 1252 args.mda_unit = TTYUNIT_LOCK; 1253 args.mda_si_drv2 = &tp->t_termios_lock_in; 1254 error = make_dev_s(&args, &lock, "%s%s.lock", prefix, name); 1255 if (error != 0) 1256 goto fail; 1257 dev_depends(dev, lock); 1258 } 1259 1260 /* Call-out devices. */ 1261 if (tp->t_flags & TF_CALLOUT) { 1262 make_dev_args_init(&args); 1263 args.mda_flags = flags; 1264 args.mda_devsw = &ttydev_cdevsw; 1265 args.mda_cr = cred; 1266 args.mda_uid = UID_UUCP; 1267 args.mda_gid = GID_DIALER; 1268 args.mda_mode = 0660; 1269 args.mda_unit = TTYUNIT_CALLOUT; 1270 args.mda_si_drv1 = tp; 1271 error = make_dev_s(&args, &cua, "cua%s", name); 1272 if (error != 0) 1273 goto fail; 1274 dev_depends(dev, cua); 1275 1276 /* Slave call-out devices. */ 1277 if (tp->t_flags & TF_INITLOCK) { 1278 args.mda_devsw = &ttyil_cdevsw; 1279 args.mda_unit = TTYUNIT_CALLOUT | TTYUNIT_INIT; 1280 args.mda_si_drv2 = &tp->t_termios_init_out; 1281 error = make_dev_s(&args, &cinit, "cua%s.init", name); 1282 if (error != 0) 1283 goto fail; 1284 dev_depends(dev, cinit); 1285 1286 args.mda_unit = TTYUNIT_CALLOUT | TTYUNIT_LOCK; 1287 args.mda_si_drv2 = &tp->t_termios_lock_out; 1288 error = make_dev_s(&args, &clock, "cua%s.lock", name); 1289 if (error != 0) 1290 goto fail; 1291 dev_depends(dev, clock); 1292 } 1293 } 1294 1295 sx_xlock(&tty_list_sx); 1296 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 1297 tty_list_count++; 1298 sx_xunlock(&tty_list_sx); 1299 1300 return (0); 1301 1302 fail: 1303 destroy_dev(dev); 1304 if (init) 1305 destroy_dev(init); 1306 if (lock) 1307 destroy_dev(lock); 1308 if (cinit) 1309 destroy_dev(cinit); 1310 if (clock) 1311 destroy_dev(clock); 1312 1313 return (error); 1314 } 1315 1316 /* 1317 * Signalling processes. 1318 */ 1319 1320 void 1321 tty_signal_sessleader(struct tty *tp, int sig) 1322 { 1323 struct proc *p; 1324 1325 tty_lock_assert(tp, MA_OWNED); 1326 MPASS(sig >= 1 && sig < NSIG); 1327 1328 /* Make signals start output again. */ 1329 tp->t_flags &= ~TF_STOPPED; 1330 1331 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) { 1332 p = tp->t_session->s_leader; 1333 PROC_LOCK(p); 1334 kern_psignal(p, sig); 1335 PROC_UNLOCK(p); 1336 } 1337 } 1338 1339 void 1340 tty_signal_pgrp(struct tty *tp, int sig) 1341 { 1342 ksiginfo_t ksi; 1343 1344 tty_lock_assert(tp, MA_OWNED); 1345 MPASS(sig >= 1 && sig < NSIG); 1346 1347 /* Make signals start output again. */ 1348 tp->t_flags &= ~TF_STOPPED; 1349 1350 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO)) 1351 tty_info(tp); 1352 if (tp->t_pgrp != NULL) { 1353 ksiginfo_init(&ksi); 1354 ksi.ksi_signo = sig; 1355 ksi.ksi_code = SI_KERNEL; 1356 PGRP_LOCK(tp->t_pgrp); 1357 pgsignal(tp->t_pgrp, sig, 1, &ksi); 1358 PGRP_UNLOCK(tp->t_pgrp); 1359 } 1360 } 1361 1362 void 1363 tty_wakeup(struct tty *tp, int flags) 1364 { 1365 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL) 1366 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 1367 1368 if (flags & FWRITE) { 1369 cv_broadcast(&tp->t_outwait); 1370 selwakeup(&tp->t_outpoll); 1371 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0); 1372 } 1373 if (flags & FREAD) { 1374 cv_broadcast(&tp->t_inwait); 1375 selwakeup(&tp->t_inpoll); 1376 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0); 1377 } 1378 } 1379 1380 int 1381 tty_wait(struct tty *tp, struct cv *cv) 1382 { 1383 int error; 1384 int revokecnt = tp->t_revokecnt; 1385 1386 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1387 MPASS(!tty_gone(tp)); 1388 1389 error = cv_wait_sig(cv, tp->t_mtx); 1390 1391 /* Bail out when the device slipped away. */ 1392 if (tty_gone(tp)) 1393 return (ENXIO); 1394 1395 /* Restart the system call when we may have been revoked. */ 1396 if (tp->t_revokecnt != revokecnt) 1397 return (ERESTART); 1398 1399 return (error); 1400 } 1401 1402 int 1403 tty_timedwait(struct tty *tp, struct cv *cv, int hz) 1404 { 1405 int error; 1406 int revokecnt = tp->t_revokecnt; 1407 1408 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1409 MPASS(!tty_gone(tp)); 1410 1411 error = cv_timedwait_sig(cv, tp->t_mtx, hz); 1412 1413 /* Bail out when the device slipped away. */ 1414 if (tty_gone(tp)) 1415 return (ENXIO); 1416 1417 /* Restart the system call when we may have been revoked. */ 1418 if (tp->t_revokecnt != revokecnt) 1419 return (ERESTART); 1420 1421 return (error); 1422 } 1423 1424 void 1425 tty_flush(struct tty *tp, int flags) 1426 { 1427 if (flags & FWRITE) { 1428 tp->t_flags &= ~TF_HIWAT_OUT; 1429 ttyoutq_flush(&tp->t_outq); 1430 tty_wakeup(tp, FWRITE); 1431 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE); 1432 } 1433 if (flags & FREAD) { 1434 tty_hiwat_in_unblock(tp); 1435 ttyinq_flush(&tp->t_inq); 1436 ttydevsw_inwakeup(tp); 1437 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD); 1438 } 1439 } 1440 1441 void 1442 tty_set_winsize(struct tty *tp, const struct winsize *wsz) 1443 { 1444 1445 if (memcmp(&tp->t_winsize, wsz, sizeof(*wsz)) == 0) 1446 return; 1447 tp->t_winsize = *wsz; 1448 tty_signal_pgrp(tp, SIGWINCH); 1449 } 1450 1451 static int 1452 tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, 1453 struct thread *td) 1454 { 1455 int error; 1456 1457 switch (cmd) { 1458 /* 1459 * Modem commands. 1460 * The SER_* and TIOCM_* flags are the same, but one bit 1461 * shifted. I don't know why. 1462 */ 1463 case TIOCSDTR: 1464 ttydevsw_modem(tp, SER_DTR, 0); 1465 return (0); 1466 case TIOCCDTR: 1467 ttydevsw_modem(tp, 0, SER_DTR); 1468 return (0); 1469 case TIOCMSET: { 1470 int bits = *(int *)data; 1471 ttydevsw_modem(tp, 1472 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 1473 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1474 return (0); 1475 } 1476 case TIOCMBIS: { 1477 int bits = *(int *)data; 1478 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0); 1479 return (0); 1480 } 1481 case TIOCMBIC: { 1482 int bits = *(int *)data; 1483 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1484 return (0); 1485 } 1486 case TIOCMGET: 1487 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1); 1488 return (0); 1489 1490 case FIOASYNC: 1491 if (*(int *)data) 1492 tp->t_flags |= TF_ASYNC; 1493 else 1494 tp->t_flags &= ~TF_ASYNC; 1495 return (0); 1496 case FIONBIO: 1497 /* This device supports non-blocking operation. */ 1498 return (0); 1499 case FIONREAD: 1500 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq); 1501 return (0); 1502 case FIONWRITE: 1503 case TIOCOUTQ: 1504 *(int *)data = ttyoutq_bytesused(&tp->t_outq); 1505 return (0); 1506 case FIOSETOWN: 1507 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1508 /* Not allowed to set ownership. */ 1509 return (ENOTTY); 1510 1511 /* Temporarily unlock the TTY to set ownership. */ 1512 tty_unlock(tp); 1513 error = fsetown(*(int *)data, &tp->t_sigio); 1514 tty_lock(tp); 1515 return (error); 1516 case FIOGETOWN: 1517 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1518 /* Not allowed to set ownership. */ 1519 return (ENOTTY); 1520 1521 /* Get ownership. */ 1522 *(int *)data = fgetown(&tp->t_sigio); 1523 return (0); 1524 case TIOCGETA: 1525 /* Obtain terminal flags through tcgetattr(). */ 1526 *(struct termios*)data = tp->t_termios; 1527 return (0); 1528 case TIOCSETA: 1529 case TIOCSETAW: 1530 case TIOCSETAF: { 1531 struct termios *t = data; 1532 1533 /* 1534 * Who makes up these funny rules? According to POSIX, 1535 * input baud rate is set equal to the output baud rate 1536 * when zero. 1537 */ 1538 if (t->c_ispeed == 0) 1539 t->c_ispeed = t->c_ospeed; 1540 1541 /* Discard any unsupported bits. */ 1542 t->c_iflag &= TTYSUP_IFLAG; 1543 t->c_oflag &= TTYSUP_OFLAG; 1544 t->c_lflag &= TTYSUP_LFLAG; 1545 t->c_cflag &= TTYSUP_CFLAG; 1546 1547 /* Set terminal flags through tcsetattr(). */ 1548 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1549 error = tty_drain(tp, 0); 1550 if (error) 1551 return (error); 1552 if (cmd == TIOCSETAF) 1553 tty_flush(tp, FREAD); 1554 } 1555 1556 /* 1557 * Only call param() when the flags really change. 1558 */ 1559 if ((t->c_cflag & CIGNORE) == 0 && 1560 (tp->t_termios.c_cflag != t->c_cflag || 1561 ((tp->t_termios.c_iflag ^ t->c_iflag) & 1562 (IXON|IXOFF|IXANY)) || 1563 tp->t_termios.c_ispeed != t->c_ispeed || 1564 tp->t_termios.c_ospeed != t->c_ospeed)) { 1565 error = ttydevsw_param(tp, t); 1566 if (error) 1567 return (error); 1568 1569 /* XXX: CLOCAL? */ 1570 1571 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE; 1572 tp->t_termios.c_ispeed = t->c_ispeed; 1573 tp->t_termios.c_ospeed = t->c_ospeed; 1574 1575 /* Baud rate has changed - update watermarks. */ 1576 tty_watermarks(tp); 1577 } 1578 1579 /* Copy new non-device driver parameters. */ 1580 tp->t_termios.c_iflag = t->c_iflag; 1581 tp->t_termios.c_oflag = t->c_oflag; 1582 tp->t_termios.c_lflag = t->c_lflag; 1583 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc); 1584 1585 ttydisc_optimize(tp); 1586 1587 if ((t->c_lflag & ICANON) == 0) { 1588 /* 1589 * When in non-canonical mode, wake up all 1590 * readers. Canonicalize any partial input. VMIN 1591 * and VTIME could also be adjusted. 1592 */ 1593 ttyinq_canonicalize(&tp->t_inq); 1594 tty_wakeup(tp, FREAD); 1595 } 1596 1597 /* 1598 * For packet mode: notify the PTY consumer that VSTOP 1599 * and VSTART may have been changed. 1600 */ 1601 if (tp->t_termios.c_iflag & IXON && 1602 tp->t_termios.c_cc[VSTOP] == CTRL('S') && 1603 tp->t_termios.c_cc[VSTART] == CTRL('Q')) 1604 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP); 1605 else 1606 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP); 1607 return (0); 1608 } 1609 case TIOCGETD: 1610 /* For compatibility - we only support TTYDISC. */ 1611 *(int *)data = TTYDISC; 1612 return (0); 1613 case TIOCGPGRP: 1614 if (!tty_is_ctty(tp, td->td_proc)) 1615 return (ENOTTY); 1616 1617 if (tp->t_pgrp != NULL) 1618 *(int *)data = tp->t_pgrp->pg_id; 1619 else 1620 *(int *)data = NO_PID; 1621 return (0); 1622 case TIOCGSID: 1623 if (!tty_is_ctty(tp, td->td_proc)) 1624 return (ENOTTY); 1625 1626 MPASS(tp->t_session); 1627 *(int *)data = tp->t_session->s_sid; 1628 return (0); 1629 case TIOCSCTTY: { 1630 struct proc *p = td->td_proc; 1631 1632 /* XXX: This looks awful. */ 1633 tty_unlock(tp); 1634 sx_xlock(&proctree_lock); 1635 tty_lock(tp); 1636 1637 if (!SESS_LEADER(p)) { 1638 /* Only the session leader may do this. */ 1639 sx_xunlock(&proctree_lock); 1640 return (EPERM); 1641 } 1642 1643 if (tp->t_session != NULL && tp->t_session == p->p_session) { 1644 /* This is already our controlling TTY. */ 1645 sx_xunlock(&proctree_lock); 1646 return (0); 1647 } 1648 1649 if (p->p_session->s_ttyp != NULL || 1650 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL && 1651 tp->t_session->s_ttyvp->v_type != VBAD)) { 1652 /* 1653 * There is already a relation between a TTY and 1654 * a session, or the caller is not the session 1655 * leader. 1656 * 1657 * Allow the TTY to be stolen when the vnode is 1658 * invalid, but the reference to the TTY is 1659 * still active. This allows immediate reuse of 1660 * TTYs of which the session leader has been 1661 * killed or the TTY revoked. 1662 */ 1663 sx_xunlock(&proctree_lock); 1664 return (EPERM); 1665 } 1666 1667 /* Connect the session to the TTY. */ 1668 tp->t_session = p->p_session; 1669 tp->t_session->s_ttyp = tp; 1670 tp->t_sessioncnt++; 1671 sx_xunlock(&proctree_lock); 1672 1673 /* Assign foreground process group. */ 1674 tp->t_pgrp = p->p_pgrp; 1675 PROC_LOCK(p); 1676 p->p_flag |= P_CONTROLT; 1677 PROC_UNLOCK(p); 1678 1679 return (0); 1680 } 1681 case TIOCSPGRP: { 1682 struct pgrp *pg; 1683 1684 /* 1685 * XXX: Temporarily unlock the TTY to locate the process 1686 * group. This code would be lot nicer if we would ever 1687 * decompose proctree_lock. 1688 */ 1689 tty_unlock(tp); 1690 sx_slock(&proctree_lock); 1691 pg = pgfind(*(int *)data); 1692 if (pg != NULL) 1693 PGRP_UNLOCK(pg); 1694 if (pg == NULL || pg->pg_session != td->td_proc->p_session) { 1695 sx_sunlock(&proctree_lock); 1696 tty_lock(tp); 1697 return (EPERM); 1698 } 1699 tty_lock(tp); 1700 1701 /* 1702 * Determine if this TTY is the controlling TTY after 1703 * relocking the TTY. 1704 */ 1705 if (!tty_is_ctty(tp, td->td_proc)) { 1706 sx_sunlock(&proctree_lock); 1707 return (ENOTTY); 1708 } 1709 tp->t_pgrp = pg; 1710 sx_sunlock(&proctree_lock); 1711 1712 /* Wake up the background process groups. */ 1713 cv_broadcast(&tp->t_bgwait); 1714 return (0); 1715 } 1716 case TIOCFLUSH: { 1717 int flags = *(int *)data; 1718 1719 if (flags == 0) 1720 flags = (FREAD|FWRITE); 1721 else 1722 flags &= (FREAD|FWRITE); 1723 tty_flush(tp, flags); 1724 return (0); 1725 } 1726 case TIOCDRAIN: 1727 /* Drain TTY output. */ 1728 return tty_drain(tp, 0); 1729 case TIOCCONS: 1730 /* Set terminal as console TTY. */ 1731 if (*(int *)data) { 1732 error = priv_check(td, PRIV_TTY_CONSOLE); 1733 if (error) 1734 return (error); 1735 1736 /* 1737 * XXX: constty should really need to be locked! 1738 * XXX: allow disconnected constty's to be stolen! 1739 */ 1740 1741 if (constty == tp) 1742 return (0); 1743 if (constty != NULL) 1744 return (EBUSY); 1745 1746 tty_unlock(tp); 1747 constty_set(tp); 1748 tty_lock(tp); 1749 } else if (constty == tp) { 1750 constty_clear(); 1751 } 1752 return (0); 1753 case TIOCGWINSZ: 1754 /* Obtain window size. */ 1755 *(struct winsize*)data = tp->t_winsize; 1756 return (0); 1757 case TIOCSWINSZ: 1758 /* Set window size. */ 1759 tty_set_winsize(tp, data); 1760 return (0); 1761 case TIOCEXCL: 1762 tp->t_flags |= TF_EXCLUDE; 1763 return (0); 1764 case TIOCNXCL: 1765 tp->t_flags &= ~TF_EXCLUDE; 1766 return (0); 1767 case TIOCSTOP: 1768 tp->t_flags |= TF_STOPPED; 1769 ttydevsw_pktnotify(tp, TIOCPKT_STOP); 1770 return (0); 1771 case TIOCSTART: 1772 tp->t_flags &= ~TF_STOPPED; 1773 ttydevsw_outwakeup(tp); 1774 ttydevsw_pktnotify(tp, TIOCPKT_START); 1775 return (0); 1776 case TIOCSTAT: 1777 tty_info(tp); 1778 return (0); 1779 case TIOCSTI: 1780 if ((fflag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI)) 1781 return (EPERM); 1782 if (!tty_is_ctty(tp, td->td_proc) && 1783 priv_check(td, PRIV_TTY_STI)) 1784 return (EACCES); 1785 ttydisc_rint(tp, *(char *)data, 0); 1786 ttydisc_rint_done(tp); 1787 return (0); 1788 } 1789 1790 #ifdef COMPAT_43TTY 1791 return tty_ioctl_compat(tp, cmd, data, fflag, td); 1792 #else /* !COMPAT_43TTY */ 1793 return (ENOIOCTL); 1794 #endif /* COMPAT_43TTY */ 1795 } 1796 1797 int 1798 tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, struct thread *td) 1799 { 1800 int error; 1801 1802 tty_lock_assert(tp, MA_OWNED); 1803 1804 if (tty_gone(tp)) 1805 return (ENXIO); 1806 1807 error = ttydevsw_ioctl(tp, cmd, data, td); 1808 if (error == ENOIOCTL) 1809 error = tty_generic_ioctl(tp, cmd, data, fflag, td); 1810 1811 return (error); 1812 } 1813 1814 dev_t 1815 tty_udev(struct tty *tp) 1816 { 1817 if (tp->t_dev) 1818 return dev2udev(tp->t_dev); 1819 else 1820 return NODEV; 1821 } 1822 1823 int 1824 tty_checkoutq(struct tty *tp) 1825 { 1826 1827 /* 256 bytes should be enough to print a log message. */ 1828 return (ttyoutq_bytesleft(&tp->t_outq) >= 256); 1829 } 1830 1831 void 1832 tty_hiwat_in_block(struct tty *tp) 1833 { 1834 1835 if ((tp->t_flags & TF_HIWAT_IN) == 0 && 1836 tp->t_termios.c_iflag & IXOFF && 1837 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) { 1838 /* 1839 * Input flow control. Only enter the high watermark when we 1840 * can successfully store the VSTOP character. 1841 */ 1842 if (ttyoutq_write_nofrag(&tp->t_outq, 1843 &tp->t_termios.c_cc[VSTOP], 1) == 0) 1844 tp->t_flags |= TF_HIWAT_IN; 1845 } else { 1846 /* No input flow control. */ 1847 tp->t_flags |= TF_HIWAT_IN; 1848 } 1849 } 1850 1851 void 1852 tty_hiwat_in_unblock(struct tty *tp) 1853 { 1854 1855 if (tp->t_flags & TF_HIWAT_IN && 1856 tp->t_termios.c_iflag & IXOFF && 1857 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) { 1858 /* 1859 * Input flow control. Only leave the high watermark when we 1860 * can successfully store the VSTART character. 1861 */ 1862 if (ttyoutq_write_nofrag(&tp->t_outq, 1863 &tp->t_termios.c_cc[VSTART], 1) == 0) 1864 tp->t_flags &= ~TF_HIWAT_IN; 1865 } else { 1866 /* No input flow control. */ 1867 tp->t_flags &= ~TF_HIWAT_IN; 1868 } 1869 1870 if (!tty_gone(tp)) 1871 ttydevsw_inwakeup(tp); 1872 } 1873 1874 /* 1875 * TTY hooks interface. 1876 */ 1877 1878 static int 1879 ttyhook_defrint(struct tty *tp, char c, int flags) 1880 { 1881 1882 if (ttyhook_rint_bypass(tp, &c, 1) != 1) 1883 return (-1); 1884 1885 return (0); 1886 } 1887 1888 int 1889 ttyhook_register(struct tty **rtp, struct proc *p, int fd, 1890 struct ttyhook *th, void *softc) 1891 { 1892 struct tty *tp; 1893 struct file *fp; 1894 struct cdev *dev; 1895 struct cdevsw *cdp; 1896 struct filedesc *fdp; 1897 cap_rights_t rights; 1898 int error, ref; 1899 1900 /* Validate the file descriptor. */ 1901 fdp = p->p_fd; 1902 error = fget_unlocked(fdp, fd, cap_rights_init(&rights, CAP_TTYHOOK), 1903 &fp, NULL); 1904 if (error != 0) 1905 return (error); 1906 if (fp->f_ops == &badfileops) { 1907 error = EBADF; 1908 goto done1; 1909 } 1910 1911 /* 1912 * Make sure the vnode is bound to a character device. 1913 * Unlocked check for the vnode type is ok there, because we 1914 * only shall prevent calling devvn_refthread on the file that 1915 * never has been opened over a character device. 1916 */ 1917 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) { 1918 error = EINVAL; 1919 goto done1; 1920 } 1921 1922 /* Make sure it is a TTY. */ 1923 cdp = devvn_refthread(fp->f_vnode, &dev, &ref); 1924 if (cdp == NULL) { 1925 error = ENXIO; 1926 goto done1; 1927 } 1928 if (dev != fp->f_data) { 1929 error = ENXIO; 1930 goto done2; 1931 } 1932 if (cdp != &ttydev_cdevsw) { 1933 error = ENOTTY; 1934 goto done2; 1935 } 1936 tp = dev->si_drv1; 1937 1938 /* Try to attach the hook to the TTY. */ 1939 error = EBUSY; 1940 tty_lock(tp); 1941 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0)); 1942 if (tp->t_flags & TF_HOOK) 1943 goto done3; 1944 1945 tp->t_flags |= TF_HOOK; 1946 tp->t_hook = th; 1947 tp->t_hooksoftc = softc; 1948 *rtp = tp; 1949 error = 0; 1950 1951 /* Maybe we can switch into bypass mode now. */ 1952 ttydisc_optimize(tp); 1953 1954 /* Silently convert rint() calls to rint_bypass() when possible. */ 1955 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass)) 1956 th->th_rint = ttyhook_defrint; 1957 1958 done3: tty_unlock(tp); 1959 done2: dev_relthread(dev, ref); 1960 done1: fdrop(fp, curthread); 1961 return (error); 1962 } 1963 1964 void 1965 ttyhook_unregister(struct tty *tp) 1966 { 1967 1968 tty_lock_assert(tp, MA_OWNED); 1969 MPASS(tp->t_flags & TF_HOOK); 1970 1971 /* Disconnect the hook. */ 1972 tp->t_flags &= ~TF_HOOK; 1973 tp->t_hook = NULL; 1974 1975 /* Maybe we need to leave bypass mode. */ 1976 ttydisc_optimize(tp); 1977 1978 /* Maybe deallocate the TTY as well. */ 1979 tty_rel_free(tp); 1980 } 1981 1982 /* 1983 * /dev/console handling. 1984 */ 1985 1986 static int 1987 ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 1988 { 1989 struct tty *tp; 1990 1991 /* System has no console device. */ 1992 if (dev_console_filename == NULL) 1993 return (ENXIO); 1994 1995 /* Look up corresponding TTY by device name. */ 1996 sx_slock(&tty_list_sx); 1997 TAILQ_FOREACH(tp, &tty_list, t_list) { 1998 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) { 1999 dev_console->si_drv1 = tp; 2000 break; 2001 } 2002 } 2003 sx_sunlock(&tty_list_sx); 2004 2005 /* System console has no TTY associated. */ 2006 if (dev_console->si_drv1 == NULL) 2007 return (ENXIO); 2008 2009 return (ttydev_open(dev, oflags, devtype, td)); 2010 } 2011 2012 static int 2013 ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag) 2014 { 2015 2016 log_console(uio); 2017 2018 return (ttydev_write(dev, uio, ioflag)); 2019 } 2020 2021 /* 2022 * /dev/console is a little different than normal TTY's. When opened, 2023 * it determines which TTY to use. When data gets written to it, it 2024 * will be logged in the kernel message buffer. 2025 */ 2026 static struct cdevsw ttyconsdev_cdevsw = { 2027 .d_version = D_VERSION, 2028 .d_open = ttyconsdev_open, 2029 .d_close = ttydev_close, 2030 .d_read = ttydev_read, 2031 .d_write = ttyconsdev_write, 2032 .d_ioctl = ttydev_ioctl, 2033 .d_kqfilter = ttydev_kqfilter, 2034 .d_poll = ttydev_poll, 2035 .d_mmap = ttydev_mmap, 2036 .d_name = "ttyconsdev", 2037 .d_flags = D_TTY, 2038 }; 2039 2040 static void 2041 ttyconsdev_init(void *unused) 2042 { 2043 2044 dev_console = make_dev_credf(MAKEDEV_ETERNAL, &ttyconsdev_cdevsw, 0, 2045 NULL, UID_ROOT, GID_WHEEL, 0600, "console"); 2046 } 2047 2048 SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL); 2049 2050 void 2051 ttyconsdev_select(const char *name) 2052 { 2053 2054 dev_console_filename = name; 2055 } 2056 2057 /* 2058 * Debugging routines. 2059 */ 2060 2061 #include "opt_ddb.h" 2062 #ifdef DDB 2063 #include <ddb/ddb.h> 2064 #include <ddb/db_sym.h> 2065 2066 static struct { 2067 int flag; 2068 char val; 2069 } ttystates[] = { 2070 #if 0 2071 { TF_NOPREFIX, 'N' }, 2072 #endif 2073 { TF_INITLOCK, 'I' }, 2074 { TF_CALLOUT, 'C' }, 2075 2076 /* Keep these together -> 'Oi' and 'Oo'. */ 2077 { TF_OPENED, 'O' }, 2078 { TF_OPENED_IN, 'i' }, 2079 { TF_OPENED_OUT, 'o' }, 2080 { TF_OPENED_CONS, 'c' }, 2081 2082 { TF_GONE, 'G' }, 2083 { TF_OPENCLOSE, 'B' }, 2084 { TF_ASYNC, 'Y' }, 2085 { TF_LITERAL, 'L' }, 2086 2087 /* Keep these together -> 'Hi' and 'Ho'. */ 2088 { TF_HIWAT, 'H' }, 2089 { TF_HIWAT_IN, 'i' }, 2090 { TF_HIWAT_OUT, 'o' }, 2091 2092 { TF_STOPPED, 'S' }, 2093 { TF_EXCLUDE, 'X' }, 2094 { TF_BYPASS, 'l' }, 2095 { TF_ZOMBIE, 'Z' }, 2096 { TF_HOOK, 's' }, 2097 2098 /* Keep these together -> 'bi' and 'bo'. */ 2099 { TF_BUSY, 'b' }, 2100 { TF_BUSY_IN, 'i' }, 2101 { TF_BUSY_OUT, 'o' }, 2102 2103 { 0, '\0'}, 2104 }; 2105 2106 #define TTY_FLAG_BITS \ 2107 "\20\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \ 2108 "\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \ 2109 "\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK" 2110 2111 #define DB_PRINTSYM(name, addr) \ 2112 db_printf("%s " #name ": ", sep); \ 2113 db_printsym((db_addr_t) addr, DB_STGY_ANY); \ 2114 db_printf("\n"); 2115 2116 static void 2117 _db_show_devsw(const char *sep, const struct ttydevsw *tsw) 2118 { 2119 db_printf("%sdevsw: ", sep); 2120 db_printsym((db_addr_t)tsw, DB_STGY_ANY); 2121 db_printf(" (%p)\n", tsw); 2122 DB_PRINTSYM(open, tsw->tsw_open); 2123 DB_PRINTSYM(close, tsw->tsw_close); 2124 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup); 2125 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup); 2126 DB_PRINTSYM(ioctl, tsw->tsw_ioctl); 2127 DB_PRINTSYM(param, tsw->tsw_param); 2128 DB_PRINTSYM(modem, tsw->tsw_modem); 2129 DB_PRINTSYM(mmap, tsw->tsw_mmap); 2130 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify); 2131 DB_PRINTSYM(free, tsw->tsw_free); 2132 } 2133 static void 2134 _db_show_hooks(const char *sep, const struct ttyhook *th) 2135 { 2136 db_printf("%shook: ", sep); 2137 db_printsym((db_addr_t)th, DB_STGY_ANY); 2138 db_printf(" (%p)\n", th); 2139 if (th == NULL) 2140 return; 2141 DB_PRINTSYM(rint, th->th_rint); 2142 DB_PRINTSYM(rint_bypass, th->th_rint_bypass); 2143 DB_PRINTSYM(rint_done, th->th_rint_done); 2144 DB_PRINTSYM(rint_poll, th->th_rint_poll); 2145 DB_PRINTSYM(getc_inject, th->th_getc_inject); 2146 DB_PRINTSYM(getc_capture, th->th_getc_capture); 2147 DB_PRINTSYM(getc_poll, th->th_getc_poll); 2148 DB_PRINTSYM(close, th->th_close); 2149 } 2150 2151 static void 2152 _db_show_termios(const char *name, const struct termios *t) 2153 { 2154 2155 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x " 2156 "lflag 0x%x ispeed %u ospeed %u\n", name, 2157 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag, 2158 t->c_ispeed, t->c_ospeed); 2159 } 2160 2161 /* DDB command to show TTY statistics. */ 2162 DB_SHOW_COMMAND(tty, db_show_tty) 2163 { 2164 struct tty *tp; 2165 2166 if (!have_addr) { 2167 db_printf("usage: show tty <addr>\n"); 2168 return; 2169 } 2170 tp = (struct tty *)addr; 2171 2172 db_printf("0x%p: %s\n", tp, tty_devname(tp)); 2173 db_printf("\tmtx: %p\n", tp->t_mtx); 2174 db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS); 2175 db_printf("\trevokecnt: %u\n", tp->t_revokecnt); 2176 2177 /* Buffering mechanisms. */ 2178 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u " 2179 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin, 2180 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end, 2181 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota); 2182 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n", 2183 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end, 2184 tp->t_outq.to_nblocks, tp->t_outq.to_quota); 2185 db_printf("\tinlow: %zu\n", tp->t_inlow); 2186 db_printf("\toutlow: %zu\n", tp->t_outlow); 2187 _db_show_termios("\ttermios", &tp->t_termios); 2188 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n", 2189 tp->t_winsize.ws_row, tp->t_winsize.ws_col, 2190 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel); 2191 db_printf("\tcolumn: %u\n", tp->t_column); 2192 db_printf("\twritepos: %u\n", tp->t_writepos); 2193 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags); 2194 2195 /* Init/lock-state devices. */ 2196 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in); 2197 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out); 2198 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in); 2199 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out); 2200 2201 /* Hooks */ 2202 _db_show_devsw("\t", tp->t_devsw); 2203 _db_show_hooks("\t", tp->t_hook); 2204 2205 /* Process info. */ 2206 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp, 2207 tp->t_pgrp ? tp->t_pgrp->pg_id : 0, 2208 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0); 2209 db_printf("\tsession: %p", tp->t_session); 2210 if (tp->t_session != NULL) 2211 db_printf(" count %u leader %p tty %p sid %d login %s", 2212 tp->t_session->s_count, tp->t_session->s_leader, 2213 tp->t_session->s_ttyp, tp->t_session->s_sid, 2214 tp->t_session->s_login); 2215 db_printf("\n"); 2216 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt); 2217 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc); 2218 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc); 2219 db_printf("\tdev: %p\n", tp->t_dev); 2220 } 2221 2222 /* DDB command to list TTYs. */ 2223 DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys) 2224 { 2225 struct tty *tp; 2226 size_t isiz, osiz; 2227 int i, j; 2228 2229 /* Make the output look like `pstat -t'. */ 2230 db_printf("PTR "); 2231 #if defined(__LP64__) 2232 db_printf(" "); 2233 #endif 2234 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW " 2235 "COL SESS PGID STATE\n"); 2236 2237 TAILQ_FOREACH(tp, &tty_list, t_list) { 2238 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE; 2239 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE; 2240 2241 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ", 2242 tp, 2243 tty_devname(tp), 2244 isiz, 2245 tp->t_inq.ti_linestart - tp->t_inq.ti_begin, 2246 tp->t_inq.ti_end - tp->t_inq.ti_linestart, 2247 isiz - tp->t_inlow, 2248 osiz, 2249 tp->t_outq.to_end - tp->t_outq.to_begin, 2250 osiz - tp->t_outlow, 2251 MIN(tp->t_column, 99999), 2252 tp->t_session ? tp->t_session->s_sid : 0, 2253 tp->t_pgrp ? tp->t_pgrp->pg_id : 0); 2254 2255 /* Flag bits. */ 2256 for (i = j = 0; ttystates[i].flag; i++) 2257 if (tp->t_flags & ttystates[i].flag) { 2258 db_printf("%c", ttystates[i].val); 2259 j++; 2260 } 2261 if (j == 0) 2262 db_printf("-"); 2263 db_printf("\n"); 2264 } 2265 } 2266 #endif /* DDB */ 2267