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 = 0; 241 242 while ((tp = dev->si_drv1) == NULL) { 243 error = tsleep(&dev->si_drv1, PCATCH, "ttdrv1", 1); 244 if (error != EWOULDBLOCK) 245 return (error); 246 } 247 248 tty_lock(tp); 249 if (tty_gone(tp)) { 250 /* Device is already gone. */ 251 tty_unlock(tp); 252 return (ENXIO); 253 } 254 255 /* 256 * Block when other processes are currently opening or closing 257 * the TTY. 258 */ 259 while (tp->t_flags & TF_OPENCLOSE) { 260 error = tty_wait(tp, &tp->t_dcdwait); 261 if (error != 0) { 262 tty_unlock(tp); 263 return (error); 264 } 265 } 266 tp->t_flags |= TF_OPENCLOSE; 267 268 /* 269 * Make sure the "tty" and "cua" device cannot be opened at the 270 * same time. 271 */ 272 if (TTY_CALLOUT(tp, dev)) { 273 if (tp->t_flags & TF_OPENED_IN) { 274 error = EBUSY; 275 goto done; 276 } 277 } else { 278 if (tp->t_flags & TF_OPENED_OUT) { 279 error = EBUSY; 280 goto done; 281 } 282 } 283 284 if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) { 285 error = EBUSY; 286 goto done; 287 } 288 289 if (!tty_opened(tp)) { 290 /* Set proper termios flags. */ 291 if (TTY_CALLOUT(tp, dev)) 292 tp->t_termios = tp->t_termios_init_out; 293 else 294 tp->t_termios = tp->t_termios_init_in; 295 ttydevsw_param(tp, &tp->t_termios); 296 /* Prevent modem control on callout devices and /dev/console. */ 297 if (TTY_CALLOUT(tp, dev) || dev == dev_console) 298 tp->t_termios.c_cflag |= CLOCAL; 299 300 ttydevsw_modem(tp, SER_DTR|SER_RTS, 0); 301 302 error = ttydevsw_open(tp); 303 if (error != 0) 304 goto done; 305 306 ttydisc_open(tp); 307 tty_watermarks(tp); /* XXXGL: drops lock */ 308 } 309 310 /* Wait for Carrier Detect. */ 311 if ((oflags & O_NONBLOCK) == 0 && 312 (tp->t_termios.c_cflag & CLOCAL) == 0) { 313 while ((ttydevsw_modem(tp, 0, 0) & SER_DCD) == 0) { 314 error = tty_wait(tp, &tp->t_dcdwait); 315 if (error != 0) 316 goto done; 317 } 318 } 319 320 if (dev == dev_console) 321 tp->t_flags |= TF_OPENED_CONS; 322 else if (TTY_CALLOUT(tp, dev)) 323 tp->t_flags |= TF_OPENED_OUT; 324 else 325 tp->t_flags |= TF_OPENED_IN; 326 327 done: tp->t_flags &= ~TF_OPENCLOSE; 328 cv_broadcast(&tp->t_dcdwait); 329 ttydev_leave(tp); 330 331 return (error); 332 } 333 334 static int 335 ttydev_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 336 { 337 struct tty *tp = dev->si_drv1; 338 339 tty_lock(tp); 340 341 /* 342 * Don't actually close the device if it is being used as the 343 * console. 344 */ 345 MPASS((tp->t_flags & TF_OPENED) != TF_OPENED); 346 if (dev == dev_console) 347 tp->t_flags &= ~TF_OPENED_CONS; 348 else 349 tp->t_flags &= ~(TF_OPENED_IN|TF_OPENED_OUT); 350 351 if (tp->t_flags & TF_OPENED) { 352 tty_unlock(tp); 353 return (0); 354 } 355 356 /* 357 * This can only be called once. The callin and the callout 358 * devices cannot be opened at the same time. 359 */ 360 tp->t_flags &= ~(TF_EXCLUDE|TF_STOPPED); 361 362 /* Properly wake up threads that are stuck - revoke(). */ 363 tp->t_revokecnt++; 364 tty_wakeup(tp, FREAD|FWRITE); 365 cv_broadcast(&tp->t_bgwait); 366 cv_broadcast(&tp->t_dcdwait); 367 368 ttydev_leave(tp); 369 370 return (0); 371 } 372 373 static __inline int 374 tty_is_ctty(struct tty *tp, struct proc *p) 375 { 376 tty_lock_assert(tp, MA_OWNED); 377 378 return (p->p_session == tp->t_session && p->p_flag & P_CONTROLT); 379 } 380 381 int 382 tty_wait_background(struct tty *tp, struct thread *td, int sig) 383 { 384 struct proc *p = td->td_proc; 385 struct pgrp *pg; 386 ksiginfo_t ksi; 387 int error; 388 389 MPASS(sig == SIGTTIN || sig == SIGTTOU); 390 tty_lock_assert(tp, MA_OWNED); 391 392 for (;;) { 393 PROC_LOCK(p); 394 /* 395 * The process should only sleep, when: 396 * - This terminal is the controling terminal 397 * - Its process group is not the foreground process 398 * group 399 * - The parent process isn't waiting for the child to 400 * exit 401 * - the signal to send to the process isn't masked 402 */ 403 if (!tty_is_ctty(tp, p) || p->p_pgrp == tp->t_pgrp) { 404 /* Allow the action to happen. */ 405 PROC_UNLOCK(p); 406 return (0); 407 } 408 409 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, sig) || 410 SIGISMEMBER(td->td_sigmask, sig)) { 411 /* Only allow them in write()/ioctl(). */ 412 PROC_UNLOCK(p); 413 return (sig == SIGTTOU ? 0 : EIO); 414 } 415 416 pg = p->p_pgrp; 417 if (p->p_flag & P_PPWAIT || pg->pg_jobc == 0) { 418 /* Don't allow the action to happen. */ 419 PROC_UNLOCK(p); 420 return (EIO); 421 } 422 PROC_UNLOCK(p); 423 424 /* 425 * Send the signal and sleep until we're the new 426 * foreground process group. 427 */ 428 if (sig != 0) { 429 ksiginfo_init(&ksi); 430 ksi.ksi_code = SI_KERNEL; 431 ksi.ksi_signo = sig; 432 sig = 0; 433 } 434 PGRP_LOCK(pg); 435 pgsignal(pg, ksi.ksi_signo, 1, &ksi); 436 PGRP_UNLOCK(pg); 437 438 error = tty_wait(tp, &tp->t_bgwait); 439 if (error) 440 return (error); 441 } 442 } 443 444 static int 445 ttydev_read(struct cdev *dev, struct uio *uio, int ioflag) 446 { 447 struct tty *tp = dev->si_drv1; 448 int error; 449 450 error = ttydev_enter(tp); 451 if (error) 452 goto done; 453 error = ttydisc_read(tp, uio, ioflag); 454 tty_unlock(tp); 455 456 /* 457 * The read() call should not throw an error when the device is 458 * being destroyed. Silently convert it to an EOF. 459 */ 460 done: if (error == ENXIO) 461 error = 0; 462 return (error); 463 } 464 465 static int 466 ttydev_write(struct cdev *dev, struct uio *uio, int ioflag) 467 { 468 struct tty *tp = dev->si_drv1; 469 int error; 470 471 error = ttydev_enter(tp); 472 if (error) 473 return (error); 474 475 if (tp->t_termios.c_lflag & TOSTOP) { 476 error = tty_wait_background(tp, curthread, SIGTTOU); 477 if (error) 478 goto done; 479 } 480 481 if (ioflag & IO_NDELAY && tp->t_flags & TF_BUSY_OUT) { 482 /* Allow non-blocking writes to bypass serialization. */ 483 error = ttydisc_write(tp, uio, ioflag); 484 } else { 485 /* Serialize write() calls. */ 486 while (tp->t_flags & TF_BUSY_OUT) { 487 error = tty_wait(tp, &tp->t_outserwait); 488 if (error) 489 goto done; 490 } 491 492 tp->t_flags |= TF_BUSY_OUT; 493 error = ttydisc_write(tp, uio, ioflag); 494 tp->t_flags &= ~TF_BUSY_OUT; 495 cv_signal(&tp->t_outserwait); 496 } 497 498 done: tty_unlock(tp); 499 return (error); 500 } 501 502 static int 503 ttydev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 504 struct thread *td) 505 { 506 struct tty *tp = dev->si_drv1; 507 int error; 508 509 error = ttydev_enter(tp); 510 if (error) 511 return (error); 512 513 switch (cmd) { 514 case TIOCCBRK: 515 case TIOCCONS: 516 case TIOCDRAIN: 517 case TIOCEXCL: 518 case TIOCFLUSH: 519 case TIOCNXCL: 520 case TIOCSBRK: 521 case TIOCSCTTY: 522 case TIOCSETA: 523 case TIOCSETAF: 524 case TIOCSETAW: 525 case TIOCSPGRP: 526 case TIOCSTART: 527 case TIOCSTAT: 528 case TIOCSTI: 529 case TIOCSTOP: 530 case TIOCSWINSZ: 531 #if 0 532 case TIOCSDRAINWAIT: 533 case TIOCSETD: 534 #endif 535 #ifdef COMPAT_43TTY 536 case TIOCLBIC: 537 case TIOCLBIS: 538 case TIOCLSET: 539 case TIOCSETC: 540 case OTIOCSETD: 541 case TIOCSETN: 542 case TIOCSETP: 543 case TIOCSLTC: 544 #endif /* COMPAT_43TTY */ 545 /* 546 * If the ioctl() causes the TTY to be modified, let it 547 * wait in the background. 548 */ 549 error = tty_wait_background(tp, curthread, SIGTTOU); 550 if (error) 551 goto done; 552 } 553 554 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 555 struct termios *old = &tp->t_termios; 556 struct termios *new = (struct termios *)data; 557 struct termios *lock = TTY_CALLOUT(tp, dev) ? 558 &tp->t_termios_lock_out : &tp->t_termios_lock_in; 559 int cc; 560 561 /* 562 * Lock state devices. Just overwrite the values of the 563 * commands that are currently in use. 564 */ 565 new->c_iflag = (old->c_iflag & lock->c_iflag) | 566 (new->c_iflag & ~lock->c_iflag); 567 new->c_oflag = (old->c_oflag & lock->c_oflag) | 568 (new->c_oflag & ~lock->c_oflag); 569 new->c_cflag = (old->c_cflag & lock->c_cflag) | 570 (new->c_cflag & ~lock->c_cflag); 571 new->c_lflag = (old->c_lflag & lock->c_lflag) | 572 (new->c_lflag & ~lock->c_lflag); 573 for (cc = 0; cc < NCCS; ++cc) 574 if (lock->c_cc[cc]) 575 new->c_cc[cc] = old->c_cc[cc]; 576 if (lock->c_ispeed) 577 new->c_ispeed = old->c_ispeed; 578 if (lock->c_ospeed) 579 new->c_ospeed = old->c_ospeed; 580 } 581 582 error = tty_ioctl(tp, cmd, data, fflag, td); 583 done: tty_unlock(tp); 584 585 return (error); 586 } 587 588 static int 589 ttydev_poll(struct cdev *dev, int events, struct thread *td) 590 { 591 struct tty *tp = dev->si_drv1; 592 int error, revents = 0; 593 594 error = ttydev_enter(tp); 595 if (error) 596 return ((events & (POLLIN|POLLRDNORM)) | POLLHUP); 597 598 if (events & (POLLIN|POLLRDNORM)) { 599 /* See if we can read something. */ 600 if (ttydisc_read_poll(tp) > 0) 601 revents |= events & (POLLIN|POLLRDNORM); 602 } 603 604 if (tp->t_flags & TF_ZOMBIE) { 605 /* Hangup flag on zombie state. */ 606 revents |= POLLHUP; 607 } else if (events & (POLLOUT|POLLWRNORM)) { 608 /* See if we can write something. */ 609 if (ttydisc_write_poll(tp) > 0) 610 revents |= events & (POLLOUT|POLLWRNORM); 611 } 612 613 if (revents == 0) { 614 if (events & (POLLIN|POLLRDNORM)) 615 selrecord(td, &tp->t_inpoll); 616 if (events & (POLLOUT|POLLWRNORM)) 617 selrecord(td, &tp->t_outpoll); 618 } 619 620 tty_unlock(tp); 621 622 return (revents); 623 } 624 625 static int 626 ttydev_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 627 int nprot, vm_memattr_t *memattr) 628 { 629 struct tty *tp = dev->si_drv1; 630 int error; 631 632 /* Handle mmap() through the driver. */ 633 634 error = ttydev_enter(tp); 635 if (error) 636 return (-1); 637 error = ttydevsw_mmap(tp, offset, paddr, nprot, memattr); 638 tty_unlock(tp); 639 640 return (error); 641 } 642 643 /* 644 * kqueue support. 645 */ 646 647 static void 648 tty_kqops_read_detach(struct knote *kn) 649 { 650 struct tty *tp = kn->kn_hook; 651 652 knlist_remove(&tp->t_inpoll.si_note, kn, 0); 653 } 654 655 static int 656 tty_kqops_read_event(struct knote *kn, long hint) 657 { 658 struct tty *tp = kn->kn_hook; 659 660 tty_lock_assert(tp, MA_OWNED); 661 662 if (tty_gone(tp) || tp->t_flags & TF_ZOMBIE) { 663 kn->kn_flags |= EV_EOF; 664 return (1); 665 } else { 666 kn->kn_data = ttydisc_read_poll(tp); 667 return (kn->kn_data > 0); 668 } 669 } 670 671 static void 672 tty_kqops_write_detach(struct knote *kn) 673 { 674 struct tty *tp = kn->kn_hook; 675 676 knlist_remove(&tp->t_outpoll.si_note, kn, 0); 677 } 678 679 static int 680 tty_kqops_write_event(struct knote *kn, long hint) 681 { 682 struct tty *tp = kn->kn_hook; 683 684 tty_lock_assert(tp, MA_OWNED); 685 686 if (tty_gone(tp)) { 687 kn->kn_flags |= EV_EOF; 688 return (1); 689 } else { 690 kn->kn_data = ttydisc_write_poll(tp); 691 return (kn->kn_data > 0); 692 } 693 } 694 695 static struct filterops tty_kqops_read = { 696 .f_isfd = 1, 697 .f_detach = tty_kqops_read_detach, 698 .f_event = tty_kqops_read_event, 699 }; 700 static struct filterops tty_kqops_write = { 701 .f_isfd = 1, 702 .f_detach = tty_kqops_write_detach, 703 .f_event = tty_kqops_write_event, 704 }; 705 706 static int 707 ttydev_kqfilter(struct cdev *dev, struct knote *kn) 708 { 709 struct tty *tp = dev->si_drv1; 710 int error; 711 712 error = ttydev_enter(tp); 713 if (error) 714 return (error); 715 716 switch (kn->kn_filter) { 717 case EVFILT_READ: 718 kn->kn_hook = tp; 719 kn->kn_fop = &tty_kqops_read; 720 knlist_add(&tp->t_inpoll.si_note, kn, 1); 721 break; 722 case EVFILT_WRITE: 723 kn->kn_hook = tp; 724 kn->kn_fop = &tty_kqops_write; 725 knlist_add(&tp->t_outpoll.si_note, kn, 1); 726 break; 727 default: 728 error = EINVAL; 729 break; 730 } 731 732 tty_unlock(tp); 733 return (error); 734 } 735 736 static struct cdevsw ttydev_cdevsw = { 737 .d_version = D_VERSION, 738 .d_open = ttydev_open, 739 .d_close = ttydev_close, 740 .d_read = ttydev_read, 741 .d_write = ttydev_write, 742 .d_ioctl = ttydev_ioctl, 743 .d_kqfilter = ttydev_kqfilter, 744 .d_poll = ttydev_poll, 745 .d_mmap = ttydev_mmap, 746 .d_name = "ttydev", 747 .d_flags = D_TTY, 748 }; 749 750 /* 751 * Init/lock-state devices 752 */ 753 754 static int 755 ttyil_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 756 { 757 struct tty *tp; 758 int error = 0; 759 760 while ((tp = dev->si_drv1) == NULL) { 761 error = tsleep(&dev->si_drv1, PCATCH, "ttdrv1", 1); 762 if (error != EWOULDBLOCK) 763 return (error); 764 } 765 tty_lock(tp); 766 if (tty_gone(tp)) 767 error = ENODEV; 768 tty_unlock(tp); 769 770 return (error); 771 } 772 773 static int 774 ttyil_close(struct cdev *dev, int flag, int mode, struct thread *td) 775 { 776 return (0); 777 } 778 779 static int 780 ttyil_rdwr(struct cdev *dev, struct uio *uio, int ioflag) 781 { 782 return (ENODEV); 783 } 784 785 static int 786 ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 787 struct thread *td) 788 { 789 struct tty *tp = dev->si_drv1; 790 int error; 791 792 tty_lock(tp); 793 if (tty_gone(tp)) { 794 error = ENODEV; 795 goto done; 796 } 797 798 error = ttydevsw_cioctl(tp, dev2unit(dev), cmd, data, td); 799 if (error != ENOIOCTL) 800 goto done; 801 error = 0; 802 803 switch (cmd) { 804 case TIOCGETA: 805 /* Obtain terminal flags through tcgetattr(). */ 806 *(struct termios*)data = *(struct termios*)dev->si_drv2; 807 break; 808 case TIOCSETA: 809 /* Set terminal flags through tcsetattr(). */ 810 error = priv_check(td, PRIV_TTY_SETA); 811 if (error) 812 break; 813 *(struct termios*)dev->si_drv2 = *(struct termios*)data; 814 break; 815 case TIOCGETD: 816 *(int *)data = TTYDISC; 817 break; 818 case TIOCGWINSZ: 819 bzero(data, sizeof(struct winsize)); 820 break; 821 default: 822 error = ENOTTY; 823 } 824 825 done: tty_unlock(tp); 826 return (error); 827 } 828 829 static struct cdevsw ttyil_cdevsw = { 830 .d_version = D_VERSION, 831 .d_open = ttyil_open, 832 .d_close = ttyil_close, 833 .d_read = ttyil_rdwr, 834 .d_write = ttyil_rdwr, 835 .d_ioctl = ttyil_ioctl, 836 .d_name = "ttyil", 837 .d_flags = D_TTY, 838 }; 839 840 static void 841 tty_init_termios(struct tty *tp) 842 { 843 struct termios *t = &tp->t_termios_init_in; 844 845 t->c_cflag = TTYDEF_CFLAG; 846 t->c_iflag = TTYDEF_IFLAG; 847 t->c_lflag = TTYDEF_LFLAG; 848 t->c_oflag = TTYDEF_OFLAG; 849 t->c_ispeed = TTYDEF_SPEED; 850 t->c_ospeed = TTYDEF_SPEED; 851 memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars); 852 853 tp->t_termios_init_out = *t; 854 } 855 856 void 857 tty_init_console(struct tty *tp, speed_t s) 858 { 859 struct termios *ti = &tp->t_termios_init_in; 860 struct termios *to = &tp->t_termios_init_out; 861 862 if (s != 0) { 863 ti->c_ispeed = ti->c_ospeed = s; 864 to->c_ispeed = to->c_ospeed = s; 865 } 866 867 ti->c_cflag |= CLOCAL; 868 to->c_cflag |= CLOCAL; 869 } 870 871 /* 872 * Standard device routine implementations, mostly meant for 873 * pseudo-terminal device drivers. When a driver creates a new terminal 874 * device class, missing routines are patched. 875 */ 876 877 static int 878 ttydevsw_defopen(struct tty *tp) 879 { 880 881 return (0); 882 } 883 884 static void 885 ttydevsw_defclose(struct tty *tp) 886 { 887 } 888 889 static void 890 ttydevsw_defoutwakeup(struct tty *tp) 891 { 892 893 panic("Terminal device has output, while not implemented"); 894 } 895 896 static void 897 ttydevsw_definwakeup(struct tty *tp) 898 { 899 } 900 901 static int 902 ttydevsw_defioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td) 903 { 904 905 return (ENOIOCTL); 906 } 907 908 static int 909 ttydevsw_defcioctl(struct tty *tp, int unit, u_long cmd, caddr_t data, struct thread *td) 910 { 911 912 return (ENOIOCTL); 913 } 914 915 static int 916 ttydevsw_defparam(struct tty *tp, struct termios *t) 917 { 918 919 /* 920 * Allow the baud rate to be adjusted for pseudo-devices, but at 921 * least restrict it to 115200 to prevent excessive buffer 922 * usage. Also disallow 0, to prevent foot shooting. 923 */ 924 if (t->c_ispeed < B50) 925 t->c_ispeed = B50; 926 else if (t->c_ispeed > B115200) 927 t->c_ispeed = B115200; 928 if (t->c_ospeed < B50) 929 t->c_ospeed = B50; 930 else if (t->c_ospeed > B115200) 931 t->c_ospeed = B115200; 932 t->c_cflag |= CREAD; 933 934 return (0); 935 } 936 937 static int 938 ttydevsw_defmodem(struct tty *tp, int sigon, int sigoff) 939 { 940 941 /* Simulate a carrier to make the TTY layer happy. */ 942 return (SER_DCD); 943 } 944 945 static int 946 ttydevsw_defmmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t *paddr, 947 int nprot, vm_memattr_t *memattr) 948 { 949 950 return (-1); 951 } 952 953 static void 954 ttydevsw_defpktnotify(struct tty *tp, char event) 955 { 956 } 957 958 static void 959 ttydevsw_deffree(void *softc) 960 { 961 962 panic("Terminal device freed without a free-handler"); 963 } 964 965 /* 966 * TTY allocation and deallocation. TTY devices can be deallocated when 967 * the driver doesn't use it anymore, when the TTY isn't a session's 968 * controlling TTY and when the device node isn't opened through devfs. 969 */ 970 971 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 #undef PATCH_FUNC 1000 1001 tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO); 1002 tp->t_devsw = tsw; 1003 tp->t_devswsoftc = sc; 1004 tp->t_flags = tsw->tsw_flags; 1005 1006 tty_init_termios(tp); 1007 1008 cv_init(&tp->t_inwait, "ttyin"); 1009 cv_init(&tp->t_outwait, "ttyout"); 1010 cv_init(&tp->t_outserwait, "ttyosr"); 1011 cv_init(&tp->t_bgwait, "ttybg"); 1012 cv_init(&tp->t_dcdwait, "ttydcd"); 1013 1014 /* Allow drivers to use a custom mutex to lock the TTY. */ 1015 if (mutex != NULL) { 1016 tp->t_mtx = mutex; 1017 } else { 1018 tp->t_mtx = &tp->t_mtxobj; 1019 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF); 1020 } 1021 1022 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx); 1023 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx); 1024 1025 return (tp); 1026 } 1027 1028 static void 1029 tty_dealloc(void *arg) 1030 { 1031 struct tty *tp = arg; 1032 1033 /* Make sure we haven't leaked buffers. */ 1034 MPASS(ttyinq_getsize(&tp->t_inq) == 0); 1035 MPASS(ttyoutq_getsize(&tp->t_outq) == 0); 1036 1037 seldrain(&tp->t_inpoll); 1038 seldrain(&tp->t_outpoll); 1039 knlist_destroy(&tp->t_inpoll.si_note); 1040 knlist_destroy(&tp->t_outpoll.si_note); 1041 1042 cv_destroy(&tp->t_inwait); 1043 cv_destroy(&tp->t_outwait); 1044 cv_destroy(&tp->t_bgwait); 1045 cv_destroy(&tp->t_dcdwait); 1046 cv_destroy(&tp->t_outserwait); 1047 1048 if (tp->t_mtx == &tp->t_mtxobj) 1049 mtx_destroy(&tp->t_mtxobj); 1050 ttydevsw_free(tp); 1051 free(tp, M_TTY); 1052 } 1053 1054 static void 1055 tty_rel_free(struct tty *tp) 1056 { 1057 struct cdev *dev; 1058 1059 tty_lock_assert(tp, MA_OWNED); 1060 1061 #define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE) 1062 if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) { 1063 /* TTY is still in use. */ 1064 tty_unlock(tp); 1065 return; 1066 } 1067 1068 /* TTY can be deallocated. */ 1069 dev = tp->t_dev; 1070 tp->t_dev = NULL; 1071 tty_unlock(tp); 1072 1073 if (dev != NULL) { 1074 sx_xlock(&tty_list_sx); 1075 TAILQ_REMOVE(&tty_list, tp, t_list); 1076 tty_list_count--; 1077 sx_xunlock(&tty_list_sx); 1078 destroy_dev_sched_cb(dev, tty_dealloc, tp); 1079 } 1080 } 1081 1082 void 1083 tty_rel_pgrp(struct tty *tp, struct pgrp *pg) 1084 { 1085 MPASS(tp->t_sessioncnt > 0); 1086 tty_lock_assert(tp, MA_OWNED); 1087 1088 if (tp->t_pgrp == pg) 1089 tp->t_pgrp = NULL; 1090 1091 tty_unlock(tp); 1092 } 1093 1094 void 1095 tty_rel_sess(struct tty *tp, struct session *sess) 1096 { 1097 MPASS(tp->t_sessioncnt > 0); 1098 1099 /* Current session has left. */ 1100 if (tp->t_session == sess) { 1101 tp->t_session = NULL; 1102 MPASS(tp->t_pgrp == NULL); 1103 } 1104 tp->t_sessioncnt--; 1105 tty_rel_free(tp); 1106 } 1107 1108 void 1109 tty_rel_gone(struct tty *tp) 1110 { 1111 MPASS(!tty_gone(tp)); 1112 1113 /* Simulate carrier removal. */ 1114 ttydisc_modem(tp, 0); 1115 1116 /* Wake up all blocked threads. */ 1117 tty_wakeup(tp, FREAD|FWRITE); 1118 cv_broadcast(&tp->t_bgwait); 1119 cv_broadcast(&tp->t_dcdwait); 1120 1121 tp->t_flags |= TF_GONE; 1122 tty_rel_free(tp); 1123 } 1124 1125 /* 1126 * Exposing information about current TTY's through sysctl 1127 */ 1128 1129 static void 1130 tty_to_xtty(struct tty *tp, struct xtty *xt) 1131 { 1132 tty_lock_assert(tp, MA_OWNED); 1133 1134 xt->xt_size = sizeof(struct xtty); 1135 xt->xt_insize = ttyinq_getsize(&tp->t_inq); 1136 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq); 1137 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq); 1138 xt->xt_inlow = tp->t_inlow; 1139 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq); 1140 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq); 1141 xt->xt_outlow = tp->t_outlow; 1142 xt->xt_column = tp->t_column; 1143 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1144 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0; 1145 xt->xt_flags = tp->t_flags; 1146 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV; 1147 } 1148 1149 static int 1150 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 1151 { 1152 unsigned long lsize; 1153 struct xtty *xtlist, *xt; 1154 struct tty *tp; 1155 int error; 1156 1157 sx_slock(&tty_list_sx); 1158 lsize = tty_list_count * sizeof(struct xtty); 1159 if (lsize == 0) { 1160 sx_sunlock(&tty_list_sx); 1161 return (0); 1162 } 1163 1164 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK); 1165 1166 TAILQ_FOREACH(tp, &tty_list, t_list) { 1167 tty_lock(tp); 1168 tty_to_xtty(tp, xt); 1169 tty_unlock(tp); 1170 xt++; 1171 } 1172 sx_sunlock(&tty_list_sx); 1173 1174 error = SYSCTL_OUT(req, xtlist, lsize); 1175 free(xtlist, M_TTY); 1176 return (error); 1177 } 1178 1179 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 1180 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs"); 1181 1182 /* 1183 * Device node creation. Device has been set up, now we can expose it to 1184 * the user. 1185 */ 1186 1187 int 1188 tty_makedevf(struct tty *tp, struct ucred *cred, int flags, 1189 const char *fmt, ...) 1190 { 1191 va_list ap; 1192 struct cdev *dev, *init, *lock, *cua, *cinit, *clock; 1193 const char *prefix = "tty"; 1194 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */ 1195 uid_t uid; 1196 gid_t gid; 1197 mode_t mode; 1198 int error; 1199 1200 /* Remove "tty" prefix from devices like PTY's. */ 1201 if (tp->t_flags & TF_NOPREFIX) 1202 prefix = ""; 1203 1204 va_start(ap, fmt); 1205 vsnrprintf(name, sizeof name, 32, fmt, ap); 1206 va_end(ap); 1207 1208 if (cred == NULL) { 1209 /* System device. */ 1210 uid = UID_ROOT; 1211 gid = GID_WHEEL; 1212 mode = S_IRUSR|S_IWUSR; 1213 } else { 1214 /* User device. */ 1215 uid = cred->cr_ruid; 1216 gid = GID_TTY; 1217 mode = S_IRUSR|S_IWUSR|S_IWGRP; 1218 } 1219 1220 flags = flags & TTYMK_CLONING ? MAKEDEV_REF : 0; 1221 flags |= MAKEDEV_CHECKNAME; 1222 1223 /* Master call-in device. */ 1224 error = make_dev_p(flags, &dev, &ttydev_cdevsw, cred, uid, gid, mode, 1225 "%s%s", prefix, name); 1226 if (error) 1227 return (error); 1228 dev->si_drv1 = tp; 1229 wakeup(&dev->si_drv1); 1230 tp->t_dev = dev; 1231 1232 init = lock = cua = cinit = clock = NULL; 1233 1234 /* Slave call-in devices. */ 1235 if (tp->t_flags & TF_INITLOCK) { 1236 error = make_dev_p(flags, &init, &ttyil_cdevsw, cred, uid, 1237 gid, mode, "%s%s.init", prefix, name); 1238 if (error) 1239 goto fail; 1240 dev_depends(dev, init); 1241 dev2unit(init) = TTYUNIT_INIT; 1242 init->si_drv1 = tp; 1243 wakeup(&init->si_drv1); 1244 init->si_drv2 = &tp->t_termios_init_in; 1245 1246 error = make_dev_p(flags, &lock, &ttyil_cdevsw, cred, uid, 1247 gid, mode, "%s%s.lock", prefix, name); 1248 if (error) 1249 goto fail; 1250 dev_depends(dev, lock); 1251 dev2unit(lock) = TTYUNIT_LOCK; 1252 lock->si_drv1 = tp; 1253 wakeup(&lock->si_drv1); 1254 lock->si_drv2 = &tp->t_termios_lock_in; 1255 } 1256 1257 /* Call-out devices. */ 1258 if (tp->t_flags & TF_CALLOUT) { 1259 error = make_dev_p(flags, &cua, &ttydev_cdevsw, cred, 1260 UID_UUCP, GID_DIALER, 0660, "cua%s", name); 1261 if (error) 1262 goto fail; 1263 dev_depends(dev, cua); 1264 dev2unit(cua) = TTYUNIT_CALLOUT; 1265 cua->si_drv1 = tp; 1266 wakeup(&cua->si_drv1); 1267 1268 /* Slave call-out devices. */ 1269 if (tp->t_flags & TF_INITLOCK) { 1270 error = make_dev_p(flags, &cinit, &ttyil_cdevsw, cred, 1271 UID_UUCP, GID_DIALER, 0660, "cua%s.init", name); 1272 if (error) 1273 goto fail; 1274 dev_depends(dev, cinit); 1275 dev2unit(cinit) = TTYUNIT_CALLOUT | TTYUNIT_INIT; 1276 cinit->si_drv1 = tp; 1277 wakeup(&cinit->si_drv1); 1278 cinit->si_drv2 = &tp->t_termios_init_out; 1279 1280 error = make_dev_p(flags, &clock, &ttyil_cdevsw, cred, 1281 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", name); 1282 if (error) 1283 goto fail; 1284 dev_depends(dev, clock); 1285 dev2unit(clock) = TTYUNIT_CALLOUT | TTYUNIT_LOCK; 1286 clock->si_drv1 = tp; 1287 wakeup(&clock->si_drv1); 1288 clock->si_drv2 = &tp->t_termios_lock_out; 1289 } 1290 } 1291 1292 sx_xlock(&tty_list_sx); 1293 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 1294 tty_list_count++; 1295 sx_xunlock(&tty_list_sx); 1296 1297 return (0); 1298 1299 fail: 1300 destroy_dev(dev); 1301 if (init) 1302 destroy_dev(init); 1303 if (lock) 1304 destroy_dev(lock); 1305 if (cinit) 1306 destroy_dev(cinit); 1307 if (clock) 1308 destroy_dev(clock); 1309 1310 return (error); 1311 } 1312 1313 /* 1314 * Signalling processes. 1315 */ 1316 1317 void 1318 tty_signal_sessleader(struct tty *tp, int sig) 1319 { 1320 struct proc *p; 1321 1322 tty_lock_assert(tp, MA_OWNED); 1323 MPASS(sig >= 1 && sig < NSIG); 1324 1325 /* Make signals start output again. */ 1326 tp->t_flags &= ~TF_STOPPED; 1327 1328 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) { 1329 p = tp->t_session->s_leader; 1330 PROC_LOCK(p); 1331 kern_psignal(p, sig); 1332 PROC_UNLOCK(p); 1333 } 1334 } 1335 1336 void 1337 tty_signal_pgrp(struct tty *tp, int sig) 1338 { 1339 ksiginfo_t ksi; 1340 1341 tty_lock_assert(tp, MA_OWNED); 1342 MPASS(sig >= 1 && sig < NSIG); 1343 1344 /* Make signals start output again. */ 1345 tp->t_flags &= ~TF_STOPPED; 1346 1347 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO)) 1348 tty_info(tp); 1349 if (tp->t_pgrp != NULL) { 1350 ksiginfo_init(&ksi); 1351 ksi.ksi_signo = sig; 1352 ksi.ksi_code = SI_KERNEL; 1353 PGRP_LOCK(tp->t_pgrp); 1354 pgsignal(tp->t_pgrp, sig, 1, &ksi); 1355 PGRP_UNLOCK(tp->t_pgrp); 1356 } 1357 } 1358 1359 void 1360 tty_wakeup(struct tty *tp, int flags) 1361 { 1362 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL) 1363 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 1364 1365 if (flags & FWRITE) { 1366 cv_broadcast(&tp->t_outwait); 1367 selwakeup(&tp->t_outpoll); 1368 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0); 1369 } 1370 if (flags & FREAD) { 1371 cv_broadcast(&tp->t_inwait); 1372 selwakeup(&tp->t_inpoll); 1373 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0); 1374 } 1375 } 1376 1377 int 1378 tty_wait(struct tty *tp, struct cv *cv) 1379 { 1380 int error; 1381 int revokecnt = tp->t_revokecnt; 1382 1383 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1384 MPASS(!tty_gone(tp)); 1385 1386 error = cv_wait_sig(cv, tp->t_mtx); 1387 1388 /* Bail out when the device slipped away. */ 1389 if (tty_gone(tp)) 1390 return (ENXIO); 1391 1392 /* Restart the system call when we may have been revoked. */ 1393 if (tp->t_revokecnt != revokecnt) 1394 return (ERESTART); 1395 1396 return (error); 1397 } 1398 1399 int 1400 tty_timedwait(struct tty *tp, struct cv *cv, int hz) 1401 { 1402 int error; 1403 int revokecnt = tp->t_revokecnt; 1404 1405 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1406 MPASS(!tty_gone(tp)); 1407 1408 error = cv_timedwait_sig(cv, tp->t_mtx, hz); 1409 1410 /* Bail out when the device slipped away. */ 1411 if (tty_gone(tp)) 1412 return (ENXIO); 1413 1414 /* Restart the system call when we may have been revoked. */ 1415 if (tp->t_revokecnt != revokecnt) 1416 return (ERESTART); 1417 1418 return (error); 1419 } 1420 1421 void 1422 tty_flush(struct tty *tp, int flags) 1423 { 1424 if (flags & FWRITE) { 1425 tp->t_flags &= ~TF_HIWAT_OUT; 1426 ttyoutq_flush(&tp->t_outq); 1427 tty_wakeup(tp, FWRITE); 1428 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE); 1429 } 1430 if (flags & FREAD) { 1431 tty_hiwat_in_unblock(tp); 1432 ttyinq_flush(&tp->t_inq); 1433 ttydevsw_inwakeup(tp); 1434 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD); 1435 } 1436 } 1437 1438 void 1439 tty_set_winsize(struct tty *tp, const struct winsize *wsz) 1440 { 1441 1442 if (memcmp(&tp->t_winsize, wsz, sizeof(*wsz)) == 0) 1443 return; 1444 tp->t_winsize = *wsz; 1445 tty_signal_pgrp(tp, SIGWINCH); 1446 } 1447 1448 static int 1449 tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, 1450 struct thread *td) 1451 { 1452 int error; 1453 1454 switch (cmd) { 1455 /* 1456 * Modem commands. 1457 * The SER_* and TIOCM_* flags are the same, but one bit 1458 * shifted. I don't know why. 1459 */ 1460 case TIOCSDTR: 1461 ttydevsw_modem(tp, SER_DTR, 0); 1462 return (0); 1463 case TIOCCDTR: 1464 ttydevsw_modem(tp, 0, SER_DTR); 1465 return (0); 1466 case TIOCMSET: { 1467 int bits = *(int *)data; 1468 ttydevsw_modem(tp, 1469 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 1470 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1471 return (0); 1472 } 1473 case TIOCMBIS: { 1474 int bits = *(int *)data; 1475 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0); 1476 return (0); 1477 } 1478 case TIOCMBIC: { 1479 int bits = *(int *)data; 1480 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1481 return (0); 1482 } 1483 case TIOCMGET: 1484 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1); 1485 return (0); 1486 1487 case FIOASYNC: 1488 if (*(int *)data) 1489 tp->t_flags |= TF_ASYNC; 1490 else 1491 tp->t_flags &= ~TF_ASYNC; 1492 return (0); 1493 case FIONBIO: 1494 /* This device supports non-blocking operation. */ 1495 return (0); 1496 case FIONREAD: 1497 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq); 1498 return (0); 1499 case FIONWRITE: 1500 case TIOCOUTQ: 1501 *(int *)data = ttyoutq_bytesused(&tp->t_outq); 1502 return (0); 1503 case FIOSETOWN: 1504 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1505 /* Not allowed to set ownership. */ 1506 return (ENOTTY); 1507 1508 /* Temporarily unlock the TTY to set ownership. */ 1509 tty_unlock(tp); 1510 error = fsetown(*(int *)data, &tp->t_sigio); 1511 tty_lock(tp); 1512 return (error); 1513 case FIOGETOWN: 1514 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1515 /* Not allowed to set ownership. */ 1516 return (ENOTTY); 1517 1518 /* Get ownership. */ 1519 *(int *)data = fgetown(&tp->t_sigio); 1520 return (0); 1521 case TIOCGETA: 1522 /* Obtain terminal flags through tcgetattr(). */ 1523 *(struct termios*)data = tp->t_termios; 1524 return (0); 1525 case TIOCSETA: 1526 case TIOCSETAW: 1527 case TIOCSETAF: { 1528 struct termios *t = data; 1529 1530 /* 1531 * Who makes up these funny rules? According to POSIX, 1532 * input baud rate is set equal to the output baud rate 1533 * when zero. 1534 */ 1535 if (t->c_ispeed == 0) 1536 t->c_ispeed = t->c_ospeed; 1537 1538 /* Discard any unsupported bits. */ 1539 t->c_iflag &= TTYSUP_IFLAG; 1540 t->c_oflag &= TTYSUP_OFLAG; 1541 t->c_lflag &= TTYSUP_LFLAG; 1542 t->c_cflag &= TTYSUP_CFLAG; 1543 1544 /* Set terminal flags through tcsetattr(). */ 1545 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1546 error = tty_drain(tp, 0); 1547 if (error) 1548 return (error); 1549 if (cmd == TIOCSETAF) 1550 tty_flush(tp, FREAD); 1551 } 1552 1553 /* 1554 * Only call param() when the flags really change. 1555 */ 1556 if ((t->c_cflag & CIGNORE) == 0 && 1557 (tp->t_termios.c_cflag != t->c_cflag || 1558 ((tp->t_termios.c_iflag ^ t->c_iflag) & 1559 (IXON|IXOFF|IXANY)) || 1560 tp->t_termios.c_ispeed != t->c_ispeed || 1561 tp->t_termios.c_ospeed != t->c_ospeed)) { 1562 error = ttydevsw_param(tp, t); 1563 if (error) 1564 return (error); 1565 1566 /* XXX: CLOCAL? */ 1567 1568 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE; 1569 tp->t_termios.c_ispeed = t->c_ispeed; 1570 tp->t_termios.c_ospeed = t->c_ospeed; 1571 1572 /* Baud rate has changed - update watermarks. */ 1573 tty_watermarks(tp); 1574 } 1575 1576 /* Copy new non-device driver parameters. */ 1577 tp->t_termios.c_iflag = t->c_iflag; 1578 tp->t_termios.c_oflag = t->c_oflag; 1579 tp->t_termios.c_lflag = t->c_lflag; 1580 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc); 1581 1582 ttydisc_optimize(tp); 1583 1584 if ((t->c_lflag & ICANON) == 0) { 1585 /* 1586 * When in non-canonical mode, wake up all 1587 * readers. Canonicalize any partial input. VMIN 1588 * and VTIME could also be adjusted. 1589 */ 1590 ttyinq_canonicalize(&tp->t_inq); 1591 tty_wakeup(tp, FREAD); 1592 } 1593 1594 /* 1595 * For packet mode: notify the PTY consumer that VSTOP 1596 * and VSTART may have been changed. 1597 */ 1598 if (tp->t_termios.c_iflag & IXON && 1599 tp->t_termios.c_cc[VSTOP] == CTRL('S') && 1600 tp->t_termios.c_cc[VSTART] == CTRL('Q')) 1601 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP); 1602 else 1603 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP); 1604 return (0); 1605 } 1606 case TIOCGETD: 1607 /* For compatibility - we only support TTYDISC. */ 1608 *(int *)data = TTYDISC; 1609 return (0); 1610 case TIOCGPGRP: 1611 if (!tty_is_ctty(tp, td->td_proc)) 1612 return (ENOTTY); 1613 1614 if (tp->t_pgrp != NULL) 1615 *(int *)data = tp->t_pgrp->pg_id; 1616 else 1617 *(int *)data = NO_PID; 1618 return (0); 1619 case TIOCGSID: 1620 if (!tty_is_ctty(tp, td->td_proc)) 1621 return (ENOTTY); 1622 1623 MPASS(tp->t_session); 1624 *(int *)data = tp->t_session->s_sid; 1625 return (0); 1626 case TIOCSCTTY: { 1627 struct proc *p = td->td_proc; 1628 1629 /* XXX: This looks awful. */ 1630 tty_unlock(tp); 1631 sx_xlock(&proctree_lock); 1632 tty_lock(tp); 1633 1634 if (!SESS_LEADER(p)) { 1635 /* Only the session leader may do this. */ 1636 sx_xunlock(&proctree_lock); 1637 return (EPERM); 1638 } 1639 1640 if (tp->t_session != NULL && tp->t_session == p->p_session) { 1641 /* This is already our controlling TTY. */ 1642 sx_xunlock(&proctree_lock); 1643 return (0); 1644 } 1645 1646 if (p->p_session->s_ttyp != NULL || 1647 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL && 1648 tp->t_session->s_ttyvp->v_type != VBAD)) { 1649 /* 1650 * There is already a relation between a TTY and 1651 * a session, or the caller is not the session 1652 * leader. 1653 * 1654 * Allow the TTY to be stolen when the vnode is 1655 * invalid, but the reference to the TTY is 1656 * still active. This allows immediate reuse of 1657 * TTYs of which the session leader has been 1658 * killed or the TTY revoked. 1659 */ 1660 sx_xunlock(&proctree_lock); 1661 return (EPERM); 1662 } 1663 1664 /* Connect the session to the TTY. */ 1665 tp->t_session = p->p_session; 1666 tp->t_session->s_ttyp = tp; 1667 tp->t_sessioncnt++; 1668 sx_xunlock(&proctree_lock); 1669 1670 /* Assign foreground process group. */ 1671 tp->t_pgrp = p->p_pgrp; 1672 PROC_LOCK(p); 1673 p->p_flag |= P_CONTROLT; 1674 PROC_UNLOCK(p); 1675 1676 return (0); 1677 } 1678 case TIOCSPGRP: { 1679 struct pgrp *pg; 1680 1681 /* 1682 * XXX: Temporarily unlock the TTY to locate the process 1683 * group. This code would be lot nicer if we would ever 1684 * decompose proctree_lock. 1685 */ 1686 tty_unlock(tp); 1687 sx_slock(&proctree_lock); 1688 pg = pgfind(*(int *)data); 1689 if (pg != NULL) 1690 PGRP_UNLOCK(pg); 1691 if (pg == NULL || pg->pg_session != td->td_proc->p_session) { 1692 sx_sunlock(&proctree_lock); 1693 tty_lock(tp); 1694 return (EPERM); 1695 } 1696 tty_lock(tp); 1697 1698 /* 1699 * Determine if this TTY is the controlling TTY after 1700 * relocking the TTY. 1701 */ 1702 if (!tty_is_ctty(tp, td->td_proc)) { 1703 sx_sunlock(&proctree_lock); 1704 return (ENOTTY); 1705 } 1706 tp->t_pgrp = pg; 1707 sx_sunlock(&proctree_lock); 1708 1709 /* Wake up the background process groups. */ 1710 cv_broadcast(&tp->t_bgwait); 1711 return (0); 1712 } 1713 case TIOCFLUSH: { 1714 int flags = *(int *)data; 1715 1716 if (flags == 0) 1717 flags = (FREAD|FWRITE); 1718 else 1719 flags &= (FREAD|FWRITE); 1720 tty_flush(tp, flags); 1721 return (0); 1722 } 1723 case TIOCDRAIN: 1724 /* Drain TTY output. */ 1725 return tty_drain(tp, 0); 1726 case TIOCCONS: 1727 /* Set terminal as console TTY. */ 1728 if (*(int *)data) { 1729 error = priv_check(td, PRIV_TTY_CONSOLE); 1730 if (error) 1731 return (error); 1732 1733 /* 1734 * XXX: constty should really need to be locked! 1735 * XXX: allow disconnected constty's to be stolen! 1736 */ 1737 1738 if (constty == tp) 1739 return (0); 1740 if (constty != NULL) 1741 return (EBUSY); 1742 1743 tty_unlock(tp); 1744 constty_set(tp); 1745 tty_lock(tp); 1746 } else if (constty == tp) { 1747 constty_clear(); 1748 } 1749 return (0); 1750 case TIOCGWINSZ: 1751 /* Obtain window size. */ 1752 *(struct winsize*)data = tp->t_winsize; 1753 return (0); 1754 case TIOCSWINSZ: 1755 /* Set window size. */ 1756 tty_set_winsize(tp, data); 1757 return (0); 1758 case TIOCEXCL: 1759 tp->t_flags |= TF_EXCLUDE; 1760 return (0); 1761 case TIOCNXCL: 1762 tp->t_flags &= ~TF_EXCLUDE; 1763 return (0); 1764 case TIOCSTOP: 1765 tp->t_flags |= TF_STOPPED; 1766 ttydevsw_pktnotify(tp, TIOCPKT_STOP); 1767 return (0); 1768 case TIOCSTART: 1769 tp->t_flags &= ~TF_STOPPED; 1770 ttydevsw_outwakeup(tp); 1771 ttydevsw_pktnotify(tp, TIOCPKT_START); 1772 return (0); 1773 case TIOCSTAT: 1774 tty_info(tp); 1775 return (0); 1776 case TIOCSTI: 1777 if ((fflag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI)) 1778 return (EPERM); 1779 if (!tty_is_ctty(tp, td->td_proc) && 1780 priv_check(td, PRIV_TTY_STI)) 1781 return (EACCES); 1782 ttydisc_rint(tp, *(char *)data, 0); 1783 ttydisc_rint_done(tp); 1784 return (0); 1785 } 1786 1787 #ifdef COMPAT_43TTY 1788 return tty_ioctl_compat(tp, cmd, data, fflag, td); 1789 #else /* !COMPAT_43TTY */ 1790 return (ENOIOCTL); 1791 #endif /* COMPAT_43TTY */ 1792 } 1793 1794 int 1795 tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, struct thread *td) 1796 { 1797 int error; 1798 1799 tty_lock_assert(tp, MA_OWNED); 1800 1801 if (tty_gone(tp)) 1802 return (ENXIO); 1803 1804 error = ttydevsw_ioctl(tp, cmd, data, td); 1805 if (error == ENOIOCTL) 1806 error = tty_generic_ioctl(tp, cmd, data, fflag, td); 1807 1808 return (error); 1809 } 1810 1811 dev_t 1812 tty_udev(struct tty *tp) 1813 { 1814 if (tp->t_dev) 1815 return dev2udev(tp->t_dev); 1816 else 1817 return NODEV; 1818 } 1819 1820 int 1821 tty_checkoutq(struct tty *tp) 1822 { 1823 1824 /* 256 bytes should be enough to print a log message. */ 1825 return (ttyoutq_bytesleft(&tp->t_outq) >= 256); 1826 } 1827 1828 void 1829 tty_hiwat_in_block(struct tty *tp) 1830 { 1831 1832 if ((tp->t_flags & TF_HIWAT_IN) == 0 && 1833 tp->t_termios.c_iflag & IXOFF && 1834 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) { 1835 /* 1836 * Input flow control. Only enter the high watermark when we 1837 * can successfully store the VSTOP character. 1838 */ 1839 if (ttyoutq_write_nofrag(&tp->t_outq, 1840 &tp->t_termios.c_cc[VSTOP], 1) == 0) 1841 tp->t_flags |= TF_HIWAT_IN; 1842 } else { 1843 /* No input flow control. */ 1844 tp->t_flags |= TF_HIWAT_IN; 1845 } 1846 } 1847 1848 void 1849 tty_hiwat_in_unblock(struct tty *tp) 1850 { 1851 1852 if (tp->t_flags & TF_HIWAT_IN && 1853 tp->t_termios.c_iflag & IXOFF && 1854 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) { 1855 /* 1856 * Input flow control. Only leave the high watermark when we 1857 * can successfully store the VSTART character. 1858 */ 1859 if (ttyoutq_write_nofrag(&tp->t_outq, 1860 &tp->t_termios.c_cc[VSTART], 1) == 0) 1861 tp->t_flags &= ~TF_HIWAT_IN; 1862 } else { 1863 /* No input flow control. */ 1864 tp->t_flags &= ~TF_HIWAT_IN; 1865 } 1866 1867 if (!tty_gone(tp)) 1868 ttydevsw_inwakeup(tp); 1869 } 1870 1871 /* 1872 * TTY hooks interface. 1873 */ 1874 1875 static int 1876 ttyhook_defrint(struct tty *tp, char c, int flags) 1877 { 1878 1879 if (ttyhook_rint_bypass(tp, &c, 1) != 1) 1880 return (-1); 1881 1882 return (0); 1883 } 1884 1885 int 1886 ttyhook_register(struct tty **rtp, struct proc *p, int fd, 1887 struct ttyhook *th, void *softc) 1888 { 1889 struct tty *tp; 1890 struct file *fp; 1891 struct cdev *dev; 1892 struct cdevsw *cdp; 1893 struct filedesc *fdp; 1894 cap_rights_t rights; 1895 int error, ref; 1896 1897 /* Validate the file descriptor. */ 1898 fdp = p->p_fd; 1899 error = fget_unlocked(fdp, fd, cap_rights_init(&rights, CAP_TTYHOOK), 1900 &fp, NULL); 1901 if (error != 0) 1902 return (error); 1903 if (fp->f_ops == &badfileops) { 1904 error = EBADF; 1905 goto done1; 1906 } 1907 1908 /* 1909 * Make sure the vnode is bound to a character device. 1910 * Unlocked check for the vnode type is ok there, because we 1911 * only shall prevent calling devvn_refthread on the file that 1912 * never has been opened over a character device. 1913 */ 1914 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) { 1915 error = EINVAL; 1916 goto done1; 1917 } 1918 1919 /* Make sure it is a TTY. */ 1920 cdp = devvn_refthread(fp->f_vnode, &dev, &ref); 1921 if (cdp == NULL) { 1922 error = ENXIO; 1923 goto done1; 1924 } 1925 if (dev != fp->f_data) { 1926 error = ENXIO; 1927 goto done2; 1928 } 1929 if (cdp != &ttydev_cdevsw) { 1930 error = ENOTTY; 1931 goto done2; 1932 } 1933 tp = dev->si_drv1; 1934 1935 /* Try to attach the hook to the TTY. */ 1936 error = EBUSY; 1937 tty_lock(tp); 1938 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0)); 1939 if (tp->t_flags & TF_HOOK) 1940 goto done3; 1941 1942 tp->t_flags |= TF_HOOK; 1943 tp->t_hook = th; 1944 tp->t_hooksoftc = softc; 1945 *rtp = tp; 1946 error = 0; 1947 1948 /* Maybe we can switch into bypass mode now. */ 1949 ttydisc_optimize(tp); 1950 1951 /* Silently convert rint() calls to rint_bypass() when possible. */ 1952 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass)) 1953 th->th_rint = ttyhook_defrint; 1954 1955 done3: tty_unlock(tp); 1956 done2: dev_relthread(dev, ref); 1957 done1: fdrop(fp, curthread); 1958 return (error); 1959 } 1960 1961 void 1962 ttyhook_unregister(struct tty *tp) 1963 { 1964 1965 tty_lock_assert(tp, MA_OWNED); 1966 MPASS(tp->t_flags & TF_HOOK); 1967 1968 /* Disconnect the hook. */ 1969 tp->t_flags &= ~TF_HOOK; 1970 tp->t_hook = NULL; 1971 1972 /* Maybe we need to leave bypass mode. */ 1973 ttydisc_optimize(tp); 1974 1975 /* Maybe deallocate the TTY as well. */ 1976 tty_rel_free(tp); 1977 } 1978 1979 /* 1980 * /dev/console handling. 1981 */ 1982 1983 static int 1984 ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 1985 { 1986 struct tty *tp; 1987 1988 /* System has no console device. */ 1989 if (dev_console_filename == NULL) 1990 return (ENXIO); 1991 1992 /* Look up corresponding TTY by device name. */ 1993 sx_slock(&tty_list_sx); 1994 TAILQ_FOREACH(tp, &tty_list, t_list) { 1995 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) { 1996 dev_console->si_drv1 = tp; 1997 break; 1998 } 1999 } 2000 sx_sunlock(&tty_list_sx); 2001 2002 /* System console has no TTY associated. */ 2003 if (dev_console->si_drv1 == NULL) 2004 return (ENXIO); 2005 2006 return (ttydev_open(dev, oflags, devtype, td)); 2007 } 2008 2009 static int 2010 ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag) 2011 { 2012 2013 log_console(uio); 2014 2015 return (ttydev_write(dev, uio, ioflag)); 2016 } 2017 2018 /* 2019 * /dev/console is a little different than normal TTY's. When opened, 2020 * it determines which TTY to use. When data gets written to it, it 2021 * will be logged in the kernel message buffer. 2022 */ 2023 static struct cdevsw ttyconsdev_cdevsw = { 2024 .d_version = D_VERSION, 2025 .d_open = ttyconsdev_open, 2026 .d_close = ttydev_close, 2027 .d_read = ttydev_read, 2028 .d_write = ttyconsdev_write, 2029 .d_ioctl = ttydev_ioctl, 2030 .d_kqfilter = ttydev_kqfilter, 2031 .d_poll = ttydev_poll, 2032 .d_mmap = ttydev_mmap, 2033 .d_name = "ttyconsdev", 2034 .d_flags = D_TTY, 2035 }; 2036 2037 static void 2038 ttyconsdev_init(void *unused) 2039 { 2040 2041 dev_console = make_dev_credf(MAKEDEV_ETERNAL, &ttyconsdev_cdevsw, 0, 2042 NULL, UID_ROOT, GID_WHEEL, 0600, "console"); 2043 } 2044 2045 SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL); 2046 2047 void 2048 ttyconsdev_select(const char *name) 2049 { 2050 2051 dev_console_filename = name; 2052 } 2053 2054 /* 2055 * Debugging routines. 2056 */ 2057 2058 #include "opt_ddb.h" 2059 #ifdef DDB 2060 #include <ddb/ddb.h> 2061 #include <ddb/db_sym.h> 2062 2063 static struct { 2064 int flag; 2065 char val; 2066 } ttystates[] = { 2067 #if 0 2068 { TF_NOPREFIX, 'N' }, 2069 #endif 2070 { TF_INITLOCK, 'I' }, 2071 { TF_CALLOUT, 'C' }, 2072 2073 /* Keep these together -> 'Oi' and 'Oo'. */ 2074 { TF_OPENED, 'O' }, 2075 { TF_OPENED_IN, 'i' }, 2076 { TF_OPENED_OUT, 'o' }, 2077 { TF_OPENED_CONS, 'c' }, 2078 2079 { TF_GONE, 'G' }, 2080 { TF_OPENCLOSE, 'B' }, 2081 { TF_ASYNC, 'Y' }, 2082 { TF_LITERAL, 'L' }, 2083 2084 /* Keep these together -> 'Hi' and 'Ho'. */ 2085 { TF_HIWAT, 'H' }, 2086 { TF_HIWAT_IN, 'i' }, 2087 { TF_HIWAT_OUT, 'o' }, 2088 2089 { TF_STOPPED, 'S' }, 2090 { TF_EXCLUDE, 'X' }, 2091 { TF_BYPASS, 'l' }, 2092 { TF_ZOMBIE, 'Z' }, 2093 { TF_HOOK, 's' }, 2094 2095 /* Keep these together -> 'bi' and 'bo'. */ 2096 { TF_BUSY, 'b' }, 2097 { TF_BUSY_IN, 'i' }, 2098 { TF_BUSY_OUT, 'o' }, 2099 2100 { 0, '\0'}, 2101 }; 2102 2103 #define TTY_FLAG_BITS \ 2104 "\20\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \ 2105 "\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \ 2106 "\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK" 2107 2108 #define DB_PRINTSYM(name, addr) \ 2109 db_printf("%s " #name ": ", sep); \ 2110 db_printsym((db_addr_t) addr, DB_STGY_ANY); \ 2111 db_printf("\n"); 2112 2113 static void 2114 _db_show_devsw(const char *sep, const struct ttydevsw *tsw) 2115 { 2116 db_printf("%sdevsw: ", sep); 2117 db_printsym((db_addr_t)tsw, DB_STGY_ANY); 2118 db_printf(" (%p)\n", tsw); 2119 DB_PRINTSYM(open, tsw->tsw_open); 2120 DB_PRINTSYM(close, tsw->tsw_close); 2121 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup); 2122 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup); 2123 DB_PRINTSYM(ioctl, tsw->tsw_ioctl); 2124 DB_PRINTSYM(param, tsw->tsw_param); 2125 DB_PRINTSYM(modem, tsw->tsw_modem); 2126 DB_PRINTSYM(mmap, tsw->tsw_mmap); 2127 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify); 2128 DB_PRINTSYM(free, tsw->tsw_free); 2129 } 2130 static void 2131 _db_show_hooks(const char *sep, const struct ttyhook *th) 2132 { 2133 db_printf("%shook: ", sep); 2134 db_printsym((db_addr_t)th, DB_STGY_ANY); 2135 db_printf(" (%p)\n", th); 2136 if (th == NULL) 2137 return; 2138 DB_PRINTSYM(rint, th->th_rint); 2139 DB_PRINTSYM(rint_bypass, th->th_rint_bypass); 2140 DB_PRINTSYM(rint_done, th->th_rint_done); 2141 DB_PRINTSYM(rint_poll, th->th_rint_poll); 2142 DB_PRINTSYM(getc_inject, th->th_getc_inject); 2143 DB_PRINTSYM(getc_capture, th->th_getc_capture); 2144 DB_PRINTSYM(getc_poll, th->th_getc_poll); 2145 DB_PRINTSYM(close, th->th_close); 2146 } 2147 2148 static void 2149 _db_show_termios(const char *name, const struct termios *t) 2150 { 2151 2152 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x " 2153 "lflag 0x%x ispeed %u ospeed %u\n", name, 2154 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag, 2155 t->c_ispeed, t->c_ospeed); 2156 } 2157 2158 /* DDB command to show TTY statistics. */ 2159 DB_SHOW_COMMAND(tty, db_show_tty) 2160 { 2161 struct tty *tp; 2162 2163 if (!have_addr) { 2164 db_printf("usage: show tty <addr>\n"); 2165 return; 2166 } 2167 tp = (struct tty *)addr; 2168 2169 db_printf("0x%p: %s\n", tp, tty_devname(tp)); 2170 db_printf("\tmtx: %p\n", tp->t_mtx); 2171 db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS); 2172 db_printf("\trevokecnt: %u\n", tp->t_revokecnt); 2173 2174 /* Buffering mechanisms. */ 2175 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u " 2176 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin, 2177 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end, 2178 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota); 2179 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n", 2180 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end, 2181 tp->t_outq.to_nblocks, tp->t_outq.to_quota); 2182 db_printf("\tinlow: %zu\n", tp->t_inlow); 2183 db_printf("\toutlow: %zu\n", tp->t_outlow); 2184 _db_show_termios("\ttermios", &tp->t_termios); 2185 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n", 2186 tp->t_winsize.ws_row, tp->t_winsize.ws_col, 2187 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel); 2188 db_printf("\tcolumn: %u\n", tp->t_column); 2189 db_printf("\twritepos: %u\n", tp->t_writepos); 2190 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags); 2191 2192 /* Init/lock-state devices. */ 2193 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in); 2194 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out); 2195 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in); 2196 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out); 2197 2198 /* Hooks */ 2199 _db_show_devsw("\t", tp->t_devsw); 2200 _db_show_hooks("\t", tp->t_hook); 2201 2202 /* Process info. */ 2203 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp, 2204 tp->t_pgrp ? tp->t_pgrp->pg_id : 0, 2205 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0); 2206 db_printf("\tsession: %p", tp->t_session); 2207 if (tp->t_session != NULL) 2208 db_printf(" count %u leader %p tty %p sid %d login %s", 2209 tp->t_session->s_count, tp->t_session->s_leader, 2210 tp->t_session->s_ttyp, tp->t_session->s_sid, 2211 tp->t_session->s_login); 2212 db_printf("\n"); 2213 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt); 2214 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc); 2215 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc); 2216 db_printf("\tdev: %p\n", tp->t_dev); 2217 } 2218 2219 /* DDB command to list TTYs. */ 2220 DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys) 2221 { 2222 struct tty *tp; 2223 size_t isiz, osiz; 2224 int i, j; 2225 2226 /* Make the output look like `pstat -t'. */ 2227 db_printf("PTR "); 2228 #if defined(__LP64__) 2229 db_printf(" "); 2230 #endif 2231 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW " 2232 "COL SESS PGID STATE\n"); 2233 2234 TAILQ_FOREACH(tp, &tty_list, t_list) { 2235 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE; 2236 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE; 2237 2238 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ", 2239 tp, 2240 tty_devname(tp), 2241 isiz, 2242 tp->t_inq.ti_linestart - tp->t_inq.ti_begin, 2243 tp->t_inq.ti_end - tp->t_inq.ti_linestart, 2244 isiz - tp->t_inlow, 2245 osiz, 2246 tp->t_outq.to_end - tp->t_outq.to_begin, 2247 osiz - tp->t_outlow, 2248 MIN(tp->t_column, 99999), 2249 tp->t_session ? tp->t_session->s_sid : 0, 2250 tp->t_pgrp ? tp->t_pgrp->pg_id : 0); 2251 2252 /* Flag bits. */ 2253 for (i = j = 0; ttystates[i].flag; i++) 2254 if (tp->t_flags & ttystates[i].flag) { 2255 db_printf("%c", ttystates[i].val); 2256 j++; 2257 } 2258 if (j == 0) 2259 db_printf("-"); 2260 db_printf("\n"); 2261 } 2262 } 2263 #endif /* DDB */ 2264