1 /*- 2 * Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Portions of this software were developed under sponsorship from Snow 6 * B.V., the Netherlands. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include "opt_capsicum.h" 34 #include "opt_compat.h" 35 36 #include <sys/param.h> 37 #include <sys/capability.h> 38 #include <sys/conf.h> 39 #include <sys/cons.h> 40 #include <sys/fcntl.h> 41 #include <sys/file.h> 42 #include <sys/filedesc.h> 43 #include <sys/filio.h> 44 #ifdef COMPAT_43TTY 45 #include <sys/ioctl_compat.h> 46 #endif /* COMPAT_43TTY */ 47 #include <sys/kernel.h> 48 #include <sys/limits.h> 49 #include <sys/malloc.h> 50 #include <sys/mount.h> 51 #include <sys/poll.h> 52 #include <sys/priv.h> 53 #include <sys/proc.h> 54 #include <sys/serial.h> 55 #include <sys/signal.h> 56 #include <sys/stat.h> 57 #include <sys/sx.h> 58 #include <sys/sysctl.h> 59 #include <sys/systm.h> 60 #include <sys/tty.h> 61 #include <sys/ttycom.h> 62 #define TTYDEFCHARS 63 #include <sys/ttydefaults.h> 64 #undef TTYDEFCHARS 65 #include <sys/ucred.h> 66 #include <sys/vnode.h> 67 68 #include <machine/stdarg.h> 69 70 static MALLOC_DEFINE(M_TTY, "tty", "tty device"); 71 72 static void tty_rel_free(struct tty *tp); 73 74 static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list); 75 static struct sx tty_list_sx; 76 SX_SYSINIT(tty_list, &tty_list_sx, "tty list"); 77 static unsigned int tty_list_count = 0; 78 79 /* Character device of /dev/console. */ 80 static struct cdev *dev_console; 81 static const char *dev_console_filename; 82 83 /* 84 * Flags that are supported and stored by this implementation. 85 */ 86 #define TTYSUP_IFLAG (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK|ISTRIP|\ 87 INLCR|IGNCR|ICRNL|IXON|IXOFF|IXANY|IMAXBEL) 88 #define TTYSUP_OFLAG (OPOST|ONLCR|TAB3|ONOEOT|OCRNL|ONOCR|ONLRET) 89 #define TTYSUP_LFLAG (ECHOKE|ECHOE|ECHOK|ECHO|ECHONL|ECHOPRT|\ 90 ECHOCTL|ISIG|ICANON|ALTWERASE|IEXTEN|TOSTOP|\ 91 FLUSHO|NOKERNINFO|NOFLSH) 92 #define TTYSUP_CFLAG (CIGNORE|CSIZE|CSTOPB|CREAD|PARENB|PARODD|\ 93 HUPCL|CLOCAL|CCTS_OFLOW|CRTS_IFLOW|CDTR_IFLOW|\ 94 CDSR_OFLOW|CCAR_OFLOW) 95 96 #define TTY_CALLOUT(tp,d) (dev2unit(d) & TTYUNIT_CALLOUT) 97 98 /* 99 * Set TTY buffer sizes. 100 */ 101 102 #define TTYBUF_MAX 65536 103 104 static void 105 tty_watermarks(struct tty *tp) 106 { 107 size_t bs = 0; 108 109 /* Provide an input buffer for 0.2 seconds of data. */ 110 if (tp->t_termios.c_cflag & CREAD) 111 bs = MIN(tp->t_termios.c_ispeed / 5, TTYBUF_MAX); 112 ttyinq_setsize(&tp->t_inq, tp, bs); 113 114 /* Set low watermark at 10% (when 90% is available). */ 115 tp->t_inlow = (ttyinq_getallocatedsize(&tp->t_inq) * 9) / 10; 116 117 /* Provide an ouput buffer for 0.2 seconds of data. */ 118 bs = MIN(tp->t_termios.c_ospeed / 5, TTYBUF_MAX); 119 ttyoutq_setsize(&tp->t_outq, tp, bs); 120 121 /* Set low watermark at 10% (when 90% is available). */ 122 tp->t_outlow = (ttyoutq_getallocatedsize(&tp->t_outq) * 9) / 10; 123 } 124 125 static int 126 tty_drain(struct tty *tp) 127 { 128 int error; 129 130 if (ttyhook_hashook(tp, getc_inject)) 131 /* buffer is inaccessible */ 132 return (0); 133 134 while (ttyoutq_bytesused(&tp->t_outq) > 0) { 135 ttydevsw_outwakeup(tp); 136 /* Could be handled synchronously. */ 137 if (ttyoutq_bytesused(&tp->t_outq) == 0) 138 return (0); 139 140 /* Wait for data to be drained. */ 141 error = tty_wait(tp, &tp->t_outwait); 142 if (error) 143 return (error); 144 } 145 146 return (0); 147 } 148 149 /* 150 * Though ttydev_enter() and ttydev_leave() seem to be related, they 151 * don't have to be used together. ttydev_enter() is used by the cdev 152 * operations to prevent an actual operation from being processed when 153 * the TTY has been abandoned. ttydev_leave() is used by ttydev_open() 154 * and ttydev_close() to determine whether per-TTY data should be 155 * deallocated. 156 */ 157 158 static __inline int 159 ttydev_enter(struct tty *tp) 160 { 161 tty_lock(tp); 162 163 if (tty_gone(tp) || !tty_opened(tp)) { 164 /* Device is already gone. */ 165 tty_unlock(tp); 166 return (ENXIO); 167 } 168 169 return (0); 170 } 171 172 static void 173 ttydev_leave(struct tty *tp) 174 { 175 tty_lock_assert(tp, MA_OWNED); 176 177 if (tty_opened(tp) || tp->t_flags & TF_OPENCLOSE) { 178 /* Device is still opened somewhere. */ 179 tty_unlock(tp); 180 return; 181 } 182 183 tp->t_flags |= TF_OPENCLOSE; 184 185 /* Stop asynchronous I/O. */ 186 funsetown(&tp->t_sigio); 187 188 /* Remove console TTY. */ 189 if (constty == tp) 190 constty_clear(); 191 192 /* Drain any output. */ 193 MPASS((tp->t_flags & TF_STOPPED) == 0); 194 if (!tty_gone(tp)) 195 tty_drain(tp); 196 197 ttydisc_close(tp); 198 199 /* Destroy associated buffers already. */ 200 ttyinq_free(&tp->t_inq); 201 tp->t_inlow = 0; 202 ttyoutq_free(&tp->t_outq); 203 tp->t_outlow = 0; 204 205 knlist_clear(&tp->t_inpoll.si_note, 1); 206 knlist_clear(&tp->t_outpoll.si_note, 1); 207 208 if (!tty_gone(tp)) 209 ttydevsw_close(tp); 210 211 tp->t_flags &= ~TF_OPENCLOSE; 212 cv_broadcast(&tp->t_dcdwait); 213 tty_rel_free(tp); 214 } 215 216 /* 217 * Operations that are exposed through the character device in /dev. 218 */ 219 static int 220 ttydev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 221 { 222 struct tty *tp = dev->si_drv1; 223 int error = 0; 224 225 tty_lock(tp); 226 if (tty_gone(tp)) { 227 /* Device is already gone. */ 228 tty_unlock(tp); 229 return (ENXIO); 230 } 231 232 /* 233 * Block when other processes are currently opening or closing 234 * the TTY. 235 */ 236 while (tp->t_flags & TF_OPENCLOSE) { 237 error = tty_wait(tp, &tp->t_dcdwait); 238 if (error != 0) { 239 tty_unlock(tp); 240 return (error); 241 } 242 } 243 tp->t_flags |= TF_OPENCLOSE; 244 245 /* 246 * Make sure the "tty" and "cua" device cannot be opened at the 247 * same time. 248 */ 249 if (TTY_CALLOUT(tp, dev)) { 250 if (tp->t_flags & TF_OPENED_IN) { 251 error = EBUSY; 252 goto done; 253 } 254 } else { 255 if (tp->t_flags & TF_OPENED_OUT) { 256 error = EBUSY; 257 goto done; 258 } 259 } 260 261 if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) { 262 error = EBUSY; 263 goto done; 264 } 265 266 if (!tty_opened(tp)) { 267 /* Set proper termios flags. */ 268 if (TTY_CALLOUT(tp, dev)) 269 tp->t_termios = tp->t_termios_init_out; 270 else 271 tp->t_termios = tp->t_termios_init_in; 272 ttydevsw_param(tp, &tp->t_termios); 273 /* Prevent modem control on callout devices and /dev/console. */ 274 if (TTY_CALLOUT(tp, dev) || dev == dev_console) 275 tp->t_termios.c_cflag |= CLOCAL; 276 277 ttydevsw_modem(tp, SER_DTR|SER_RTS, 0); 278 279 error = ttydevsw_open(tp); 280 if (error != 0) 281 goto done; 282 283 ttydisc_open(tp); 284 tty_watermarks(tp); 285 } 286 287 /* Wait for Carrier Detect. */ 288 if ((oflags & O_NONBLOCK) == 0 && 289 (tp->t_termios.c_cflag & CLOCAL) == 0) { 290 while ((ttydevsw_modem(tp, 0, 0) & SER_DCD) == 0) { 291 error = tty_wait(tp, &tp->t_dcdwait); 292 if (error != 0) 293 goto done; 294 } 295 } 296 297 if (dev == dev_console) 298 tp->t_flags |= TF_OPENED_CONS; 299 else if (TTY_CALLOUT(tp, dev)) 300 tp->t_flags |= TF_OPENED_OUT; 301 else 302 tp->t_flags |= TF_OPENED_IN; 303 304 done: tp->t_flags &= ~TF_OPENCLOSE; 305 cv_broadcast(&tp->t_dcdwait); 306 ttydev_leave(tp); 307 308 return (error); 309 } 310 311 static int 312 ttydev_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 313 { 314 struct tty *tp = dev->si_drv1; 315 316 tty_lock(tp); 317 318 /* 319 * Don't actually close the device if it is being used as the 320 * console. 321 */ 322 MPASS((tp->t_flags & TF_OPENED) != TF_OPENED); 323 if (dev == dev_console) 324 tp->t_flags &= ~TF_OPENED_CONS; 325 else 326 tp->t_flags &= ~(TF_OPENED_IN|TF_OPENED_OUT); 327 328 if (tp->t_flags & TF_OPENED) { 329 tty_unlock(tp); 330 return (0); 331 } 332 333 /* 334 * This can only be called once. The callin and the callout 335 * devices cannot be opened at the same time. 336 */ 337 tp->t_flags &= ~(TF_EXCLUDE|TF_STOPPED); 338 339 /* Properly wake up threads that are stuck - revoke(). */ 340 tp->t_revokecnt++; 341 tty_wakeup(tp, FREAD|FWRITE); 342 cv_broadcast(&tp->t_bgwait); 343 cv_broadcast(&tp->t_dcdwait); 344 345 ttydev_leave(tp); 346 347 return (0); 348 } 349 350 static __inline int 351 tty_is_ctty(struct tty *tp, struct proc *p) 352 { 353 tty_lock_assert(tp, MA_OWNED); 354 355 return (p->p_session == tp->t_session && p->p_flag & P_CONTROLT); 356 } 357 358 static int 359 tty_wait_background(struct tty *tp, struct thread *td, int sig) 360 { 361 struct proc *p = td->td_proc; 362 struct pgrp *pg; 363 ksiginfo_t ksi; 364 int error; 365 366 MPASS(sig == SIGTTIN || sig == SIGTTOU); 367 tty_lock_assert(tp, MA_OWNED); 368 369 for (;;) { 370 PROC_LOCK(p); 371 /* 372 * The process should only sleep, when: 373 * - This terminal is the controling terminal 374 * - Its process group is not the foreground process 375 * group 376 * - The parent process isn't waiting for the child to 377 * exit 378 * - the signal to send to the process isn't masked 379 */ 380 if (!tty_is_ctty(tp, p) || p->p_pgrp == tp->t_pgrp) { 381 /* Allow the action to happen. */ 382 PROC_UNLOCK(p); 383 return (0); 384 } 385 386 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, sig) || 387 SIGISMEMBER(td->td_sigmask, sig)) { 388 /* Only allow them in write()/ioctl(). */ 389 PROC_UNLOCK(p); 390 return (sig == SIGTTOU ? 0 : EIO); 391 } 392 393 pg = p->p_pgrp; 394 if (p->p_flag & P_PPWAIT || pg->pg_jobc == 0) { 395 /* Don't allow the action to happen. */ 396 PROC_UNLOCK(p); 397 return (EIO); 398 } 399 PROC_UNLOCK(p); 400 401 /* 402 * Send the signal and sleep until we're the new 403 * foreground process group. 404 */ 405 if (sig != 0) { 406 ksiginfo_init(&ksi); 407 ksi.ksi_code = SI_KERNEL; 408 ksi.ksi_signo = sig; 409 sig = 0; 410 } 411 PGRP_LOCK(pg); 412 pgsignal(pg, ksi.ksi_signo, 1, &ksi); 413 PGRP_UNLOCK(pg); 414 415 error = tty_wait(tp, &tp->t_bgwait); 416 if (error) 417 return (error); 418 } 419 } 420 421 static int 422 ttydev_read(struct cdev *dev, struct uio *uio, int ioflag) 423 { 424 struct tty *tp = dev->si_drv1; 425 int error; 426 427 error = ttydev_enter(tp); 428 if (error) 429 goto done; 430 431 error = tty_wait_background(tp, curthread, SIGTTIN); 432 if (error) { 433 tty_unlock(tp); 434 goto done; 435 } 436 437 error = ttydisc_read(tp, uio, ioflag); 438 tty_unlock(tp); 439 440 /* 441 * The read() call should not throw an error when the device is 442 * being destroyed. Silently convert it to an EOF. 443 */ 444 done: if (error == ENXIO) 445 error = 0; 446 return (error); 447 } 448 449 static int 450 ttydev_write(struct cdev *dev, struct uio *uio, int ioflag) 451 { 452 struct tty *tp = dev->si_drv1; 453 int error; 454 455 error = ttydev_enter(tp); 456 if (error) 457 return (error); 458 459 if (tp->t_termios.c_lflag & TOSTOP) { 460 error = tty_wait_background(tp, curthread, SIGTTOU); 461 if (error) 462 goto done; 463 } 464 465 if (ioflag & IO_NDELAY && tp->t_flags & TF_BUSY_OUT) { 466 /* Allow non-blocking writes to bypass serialization. */ 467 error = ttydisc_write(tp, uio, ioflag); 468 } else { 469 /* Serialize write() calls. */ 470 while (tp->t_flags & TF_BUSY_OUT) { 471 error = tty_wait(tp, &tp->t_outserwait); 472 if (error) 473 goto done; 474 } 475 476 tp->t_flags |= TF_BUSY_OUT; 477 error = ttydisc_write(tp, uio, ioflag); 478 tp->t_flags &= ~TF_BUSY_OUT; 479 cv_signal(&tp->t_outserwait); 480 } 481 482 done: tty_unlock(tp); 483 return (error); 484 } 485 486 static int 487 ttydev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 488 struct thread *td) 489 { 490 struct tty *tp = dev->si_drv1; 491 int error; 492 493 error = ttydev_enter(tp); 494 if (error) 495 return (error); 496 497 switch (cmd) { 498 case TIOCCBRK: 499 case TIOCCONS: 500 case TIOCDRAIN: 501 case TIOCEXCL: 502 case TIOCFLUSH: 503 case TIOCNXCL: 504 case TIOCSBRK: 505 case TIOCSCTTY: 506 case TIOCSETA: 507 case TIOCSETAF: 508 case TIOCSETAW: 509 case TIOCSPGRP: 510 case TIOCSTART: 511 case TIOCSTAT: 512 case TIOCSTI: 513 case TIOCSTOP: 514 case TIOCSWINSZ: 515 #if 0 516 case TIOCSDRAINWAIT: 517 case TIOCSETD: 518 #endif 519 #ifdef COMPAT_43TTY 520 case TIOCLBIC: 521 case TIOCLBIS: 522 case TIOCLSET: 523 case TIOCSETC: 524 case OTIOCSETD: 525 case TIOCSETN: 526 case TIOCSETP: 527 case TIOCSLTC: 528 #endif /* COMPAT_43TTY */ 529 /* 530 * If the ioctl() causes the TTY to be modified, let it 531 * wait in the background. 532 */ 533 error = tty_wait_background(tp, curthread, SIGTTOU); 534 if (error) 535 goto done; 536 } 537 538 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 539 struct termios *old = &tp->t_termios; 540 struct termios *new = (struct termios *)data; 541 struct termios *lock = TTY_CALLOUT(tp, dev) ? 542 &tp->t_termios_lock_out : &tp->t_termios_lock_in; 543 int cc; 544 545 /* 546 * Lock state devices. Just overwrite the values of the 547 * commands that are currently in use. 548 */ 549 new->c_iflag = (old->c_iflag & lock->c_iflag) | 550 (new->c_iflag & ~lock->c_iflag); 551 new->c_oflag = (old->c_oflag & lock->c_oflag) | 552 (new->c_oflag & ~lock->c_oflag); 553 new->c_cflag = (old->c_cflag & lock->c_cflag) | 554 (new->c_cflag & ~lock->c_cflag); 555 new->c_lflag = (old->c_lflag & lock->c_lflag) | 556 (new->c_lflag & ~lock->c_lflag); 557 for (cc = 0; cc < NCCS; ++cc) 558 if (lock->c_cc[cc]) 559 new->c_cc[cc] = old->c_cc[cc]; 560 if (lock->c_ispeed) 561 new->c_ispeed = old->c_ispeed; 562 if (lock->c_ospeed) 563 new->c_ospeed = old->c_ospeed; 564 } 565 566 error = tty_ioctl(tp, cmd, data, fflag, td); 567 done: tty_unlock(tp); 568 569 return (error); 570 } 571 572 static int 573 ttydev_poll(struct cdev *dev, int events, struct thread *td) 574 { 575 struct tty *tp = dev->si_drv1; 576 int error, revents = 0; 577 578 error = ttydev_enter(tp); 579 if (error) 580 return ((events & (POLLIN|POLLRDNORM)) | POLLHUP); 581 582 if (events & (POLLIN|POLLRDNORM)) { 583 /* See if we can read something. */ 584 if (ttydisc_read_poll(tp) > 0) 585 revents |= events & (POLLIN|POLLRDNORM); 586 } 587 588 if (tp->t_flags & TF_ZOMBIE) { 589 /* Hangup flag on zombie state. */ 590 revents |= POLLHUP; 591 } else if (events & (POLLOUT|POLLWRNORM)) { 592 /* See if we can write something. */ 593 if (ttydisc_write_poll(tp) > 0) 594 revents |= events & (POLLOUT|POLLWRNORM); 595 } 596 597 if (revents == 0) { 598 if (events & (POLLIN|POLLRDNORM)) 599 selrecord(td, &tp->t_inpoll); 600 if (events & (POLLOUT|POLLWRNORM)) 601 selrecord(td, &tp->t_outpoll); 602 } 603 604 tty_unlock(tp); 605 606 return (revents); 607 } 608 609 static int 610 ttydev_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 611 int nprot, vm_memattr_t *memattr) 612 { 613 struct tty *tp = dev->si_drv1; 614 int error; 615 616 /* Handle mmap() through the driver. */ 617 618 error = ttydev_enter(tp); 619 if (error) 620 return (-1); 621 error = ttydevsw_mmap(tp, offset, paddr, nprot, memattr); 622 tty_unlock(tp); 623 624 return (error); 625 } 626 627 /* 628 * kqueue support. 629 */ 630 631 static void 632 tty_kqops_read_detach(struct knote *kn) 633 { 634 struct tty *tp = kn->kn_hook; 635 636 knlist_remove(&tp->t_inpoll.si_note, kn, 0); 637 } 638 639 static int 640 tty_kqops_read_event(struct knote *kn, long hint) 641 { 642 struct tty *tp = kn->kn_hook; 643 644 tty_lock_assert(tp, MA_OWNED); 645 646 if (tty_gone(tp) || tp->t_flags & TF_ZOMBIE) { 647 kn->kn_flags |= EV_EOF; 648 return (1); 649 } else { 650 kn->kn_data = ttydisc_read_poll(tp); 651 return (kn->kn_data > 0); 652 } 653 } 654 655 static void 656 tty_kqops_write_detach(struct knote *kn) 657 { 658 struct tty *tp = kn->kn_hook; 659 660 knlist_remove(&tp->t_outpoll.si_note, kn, 0); 661 } 662 663 static int 664 tty_kqops_write_event(struct knote *kn, long hint) 665 { 666 struct tty *tp = kn->kn_hook; 667 668 tty_lock_assert(tp, MA_OWNED); 669 670 if (tty_gone(tp)) { 671 kn->kn_flags |= EV_EOF; 672 return (1); 673 } else { 674 kn->kn_data = ttydisc_write_poll(tp); 675 return (kn->kn_data > 0); 676 } 677 } 678 679 static struct filterops tty_kqops_read = { 680 .f_isfd = 1, 681 .f_detach = tty_kqops_read_detach, 682 .f_event = tty_kqops_read_event, 683 }; 684 static struct filterops tty_kqops_write = { 685 .f_isfd = 1, 686 .f_detach = tty_kqops_write_detach, 687 .f_event = tty_kqops_write_event, 688 }; 689 690 static int 691 ttydev_kqfilter(struct cdev *dev, struct knote *kn) 692 { 693 struct tty *tp = dev->si_drv1; 694 int error; 695 696 error = ttydev_enter(tp); 697 if (error) 698 return (error); 699 700 switch (kn->kn_filter) { 701 case EVFILT_READ: 702 kn->kn_hook = tp; 703 kn->kn_fop = &tty_kqops_read; 704 knlist_add(&tp->t_inpoll.si_note, kn, 1); 705 break; 706 case EVFILT_WRITE: 707 kn->kn_hook = tp; 708 kn->kn_fop = &tty_kqops_write; 709 knlist_add(&tp->t_outpoll.si_note, kn, 1); 710 break; 711 default: 712 error = EINVAL; 713 break; 714 } 715 716 tty_unlock(tp); 717 return (error); 718 } 719 720 static struct cdevsw ttydev_cdevsw = { 721 .d_version = D_VERSION, 722 .d_open = ttydev_open, 723 .d_close = ttydev_close, 724 .d_read = ttydev_read, 725 .d_write = ttydev_write, 726 .d_ioctl = ttydev_ioctl, 727 .d_kqfilter = ttydev_kqfilter, 728 .d_poll = ttydev_poll, 729 .d_mmap = ttydev_mmap, 730 .d_name = "ttydev", 731 .d_flags = D_TTY, 732 }; 733 734 /* 735 * Init/lock-state devices 736 */ 737 738 static int 739 ttyil_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 740 { 741 struct tty *tp = dev->si_drv1; 742 int error = 0; 743 744 tty_lock(tp); 745 if (tty_gone(tp)) 746 error = ENODEV; 747 tty_unlock(tp); 748 749 return (error); 750 } 751 752 static int 753 ttyil_close(struct cdev *dev, int flag, int mode, struct thread *td) 754 { 755 return (0); 756 } 757 758 static int 759 ttyil_rdwr(struct cdev *dev, struct uio *uio, int ioflag) 760 { 761 return (ENODEV); 762 } 763 764 static int 765 ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 766 struct thread *td) 767 { 768 struct tty *tp = dev->si_drv1; 769 int error = 0; 770 771 tty_lock(tp); 772 if (tty_gone(tp)) { 773 error = ENODEV; 774 goto done; 775 } 776 777 error = ttydevsw_cioctl(tp, dev2unit(dev), cmd, data, td); 778 if (error != ENOIOCTL) 779 goto done; 780 781 switch (cmd) { 782 case TIOCGETA: 783 /* Obtain terminal flags through tcgetattr(). */ 784 *(struct termios*)data = *(struct termios*)dev->si_drv2; 785 break; 786 case TIOCSETA: 787 /* Set terminal flags through tcsetattr(). */ 788 error = priv_check(td, PRIV_TTY_SETA); 789 if (error) 790 break; 791 *(struct termios*)dev->si_drv2 = *(struct termios*)data; 792 break; 793 case TIOCGETD: 794 *(int *)data = TTYDISC; 795 break; 796 case TIOCGWINSZ: 797 bzero(data, sizeof(struct winsize)); 798 break; 799 default: 800 error = ENOTTY; 801 } 802 803 done: tty_unlock(tp); 804 return (error); 805 } 806 807 static struct cdevsw ttyil_cdevsw = { 808 .d_version = D_VERSION, 809 .d_open = ttyil_open, 810 .d_close = ttyil_close, 811 .d_read = ttyil_rdwr, 812 .d_write = ttyil_rdwr, 813 .d_ioctl = ttyil_ioctl, 814 .d_name = "ttyil", 815 .d_flags = D_TTY, 816 }; 817 818 static void 819 tty_init_termios(struct tty *tp) 820 { 821 struct termios *t = &tp->t_termios_init_in; 822 823 t->c_cflag = TTYDEF_CFLAG; 824 t->c_iflag = TTYDEF_IFLAG; 825 t->c_lflag = TTYDEF_LFLAG; 826 t->c_oflag = TTYDEF_OFLAG; 827 t->c_ispeed = TTYDEF_SPEED; 828 t->c_ospeed = TTYDEF_SPEED; 829 memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars); 830 831 tp->t_termios_init_out = *t; 832 } 833 834 void 835 tty_init_console(struct tty *tp, speed_t s) 836 { 837 struct termios *ti = &tp->t_termios_init_in; 838 struct termios *to = &tp->t_termios_init_out; 839 840 if (s != 0) { 841 ti->c_ispeed = ti->c_ospeed = s; 842 to->c_ispeed = to->c_ospeed = s; 843 } 844 845 ti->c_cflag |= CLOCAL; 846 to->c_cflag |= CLOCAL; 847 } 848 849 /* 850 * Standard device routine implementations, mostly meant for 851 * pseudo-terminal device drivers. When a driver creates a new terminal 852 * device class, missing routines are patched. 853 */ 854 855 static int 856 ttydevsw_defopen(struct tty *tp) 857 { 858 859 return (0); 860 } 861 862 static void 863 ttydevsw_defclose(struct tty *tp) 864 { 865 } 866 867 static void 868 ttydevsw_defoutwakeup(struct tty *tp) 869 { 870 871 panic("Terminal device has output, while not implemented"); 872 } 873 874 static void 875 ttydevsw_definwakeup(struct tty *tp) 876 { 877 } 878 879 static int 880 ttydevsw_defioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td) 881 { 882 883 return (ENOIOCTL); 884 } 885 886 static int 887 ttydevsw_defcioctl(struct tty *tp, int unit, u_long cmd, caddr_t data, struct thread *td) 888 { 889 890 return (ENOIOCTL); 891 } 892 893 static int 894 ttydevsw_defparam(struct tty *tp, struct termios *t) 895 { 896 897 /* 898 * Allow the baud rate to be adjusted for pseudo-devices, but at 899 * least restrict it to 115200 to prevent excessive buffer 900 * usage. Also disallow 0, to prevent foot shooting. 901 */ 902 if (t->c_ispeed < B50) 903 t->c_ispeed = B50; 904 else if (t->c_ispeed > B115200) 905 t->c_ispeed = B115200; 906 if (t->c_ospeed < B50) 907 t->c_ospeed = B50; 908 else if (t->c_ospeed > B115200) 909 t->c_ospeed = B115200; 910 t->c_cflag |= CREAD; 911 912 return (0); 913 } 914 915 static int 916 ttydevsw_defmodem(struct tty *tp, int sigon, int sigoff) 917 { 918 919 /* Simulate a carrier to make the TTY layer happy. */ 920 return (SER_DCD); 921 } 922 923 static int 924 ttydevsw_defmmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t *paddr, 925 int nprot, vm_memattr_t *memattr) 926 { 927 928 return (-1); 929 } 930 931 static void 932 ttydevsw_defpktnotify(struct tty *tp, char event) 933 { 934 } 935 936 static void 937 ttydevsw_deffree(void *softc) 938 { 939 940 panic("Terminal device freed without a free-handler"); 941 } 942 943 /* 944 * TTY allocation and deallocation. TTY devices can be deallocated when 945 * the driver doesn't use it anymore, when the TTY isn't a session's 946 * controlling TTY and when the device node isn't opened through devfs. 947 */ 948 949 struct tty * 950 tty_alloc(struct ttydevsw *tsw, void *sc) 951 { 952 953 return (tty_alloc_mutex(tsw, sc, NULL)); 954 } 955 956 struct tty * 957 tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex) 958 { 959 struct tty *tp; 960 961 /* Make sure the driver defines all routines. */ 962 #define PATCH_FUNC(x) do { \ 963 if (tsw->tsw_ ## x == NULL) \ 964 tsw->tsw_ ## x = ttydevsw_def ## x; \ 965 } while (0) 966 PATCH_FUNC(open); 967 PATCH_FUNC(close); 968 PATCH_FUNC(outwakeup); 969 PATCH_FUNC(inwakeup); 970 PATCH_FUNC(ioctl); 971 PATCH_FUNC(cioctl); 972 PATCH_FUNC(param); 973 PATCH_FUNC(modem); 974 PATCH_FUNC(mmap); 975 PATCH_FUNC(pktnotify); 976 PATCH_FUNC(free); 977 #undef PATCH_FUNC 978 979 tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO); 980 tp->t_devsw = tsw; 981 tp->t_devswsoftc = sc; 982 tp->t_flags = tsw->tsw_flags; 983 984 tty_init_termios(tp); 985 986 cv_init(&tp->t_inwait, "ttyin"); 987 cv_init(&tp->t_outwait, "ttyout"); 988 cv_init(&tp->t_outserwait, "ttyosr"); 989 cv_init(&tp->t_bgwait, "ttybg"); 990 cv_init(&tp->t_dcdwait, "ttydcd"); 991 992 /* Allow drivers to use a custom mutex to lock the TTY. */ 993 if (mutex != NULL) { 994 tp->t_mtx = mutex; 995 } else { 996 tp->t_mtx = &tp->t_mtxobj; 997 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF); 998 } 999 1000 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx); 1001 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx); 1002 1003 sx_xlock(&tty_list_sx); 1004 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 1005 tty_list_count++; 1006 sx_xunlock(&tty_list_sx); 1007 1008 return (tp); 1009 } 1010 1011 static void 1012 tty_dealloc(void *arg) 1013 { 1014 struct tty *tp = arg; 1015 1016 sx_xlock(&tty_list_sx); 1017 TAILQ_REMOVE(&tty_list, tp, t_list); 1018 tty_list_count--; 1019 sx_xunlock(&tty_list_sx); 1020 1021 /* Make sure we haven't leaked buffers. */ 1022 MPASS(ttyinq_getsize(&tp->t_inq) == 0); 1023 MPASS(ttyoutq_getsize(&tp->t_outq) == 0); 1024 1025 seldrain(&tp->t_inpoll); 1026 seldrain(&tp->t_outpoll); 1027 knlist_destroy(&tp->t_inpoll.si_note); 1028 knlist_destroy(&tp->t_outpoll.si_note); 1029 1030 cv_destroy(&tp->t_inwait); 1031 cv_destroy(&tp->t_outwait); 1032 cv_destroy(&tp->t_bgwait); 1033 cv_destroy(&tp->t_dcdwait); 1034 cv_destroy(&tp->t_outserwait); 1035 1036 if (tp->t_mtx == &tp->t_mtxobj) 1037 mtx_destroy(&tp->t_mtxobj); 1038 ttydevsw_free(tp); 1039 free(tp, M_TTY); 1040 } 1041 1042 static void 1043 tty_rel_free(struct tty *tp) 1044 { 1045 struct cdev *dev; 1046 1047 tty_lock_assert(tp, MA_OWNED); 1048 1049 #define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE) 1050 if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) { 1051 /* TTY is still in use. */ 1052 tty_unlock(tp); 1053 return; 1054 } 1055 1056 /* TTY can be deallocated. */ 1057 dev = tp->t_dev; 1058 tp->t_dev = NULL; 1059 tty_unlock(tp); 1060 1061 if (dev != NULL) 1062 destroy_dev_sched_cb(dev, tty_dealloc, tp); 1063 } 1064 1065 void 1066 tty_rel_pgrp(struct tty *tp, struct pgrp *pg) 1067 { 1068 MPASS(tp->t_sessioncnt > 0); 1069 tty_lock_assert(tp, MA_OWNED); 1070 1071 if (tp->t_pgrp == pg) 1072 tp->t_pgrp = NULL; 1073 1074 tty_unlock(tp); 1075 } 1076 1077 void 1078 tty_rel_sess(struct tty *tp, struct session *sess) 1079 { 1080 MPASS(tp->t_sessioncnt > 0); 1081 1082 /* Current session has left. */ 1083 if (tp->t_session == sess) { 1084 tp->t_session = NULL; 1085 MPASS(tp->t_pgrp == NULL); 1086 } 1087 tp->t_sessioncnt--; 1088 tty_rel_free(tp); 1089 } 1090 1091 void 1092 tty_rel_gone(struct tty *tp) 1093 { 1094 MPASS(!tty_gone(tp)); 1095 1096 /* Simulate carrier removal. */ 1097 ttydisc_modem(tp, 0); 1098 1099 /* Wake up all blocked threads. */ 1100 tty_wakeup(tp, FREAD|FWRITE); 1101 cv_broadcast(&tp->t_bgwait); 1102 cv_broadcast(&tp->t_dcdwait); 1103 1104 tp->t_flags |= TF_GONE; 1105 tty_rel_free(tp); 1106 } 1107 1108 /* 1109 * Exposing information about current TTY's through sysctl 1110 */ 1111 1112 static void 1113 tty_to_xtty(struct tty *tp, struct xtty *xt) 1114 { 1115 tty_lock_assert(tp, MA_OWNED); 1116 1117 xt->xt_size = sizeof(struct xtty); 1118 xt->xt_insize = ttyinq_getsize(&tp->t_inq); 1119 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq); 1120 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq); 1121 xt->xt_inlow = tp->t_inlow; 1122 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq); 1123 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq); 1124 xt->xt_outlow = tp->t_outlow; 1125 xt->xt_column = tp->t_column; 1126 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1127 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0; 1128 xt->xt_flags = tp->t_flags; 1129 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV; 1130 } 1131 1132 static int 1133 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 1134 { 1135 unsigned long lsize; 1136 struct xtty *xtlist, *xt; 1137 struct tty *tp; 1138 int error; 1139 1140 sx_slock(&tty_list_sx); 1141 lsize = tty_list_count * sizeof(struct xtty); 1142 if (lsize == 0) { 1143 sx_sunlock(&tty_list_sx); 1144 return (0); 1145 } 1146 1147 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK); 1148 1149 TAILQ_FOREACH(tp, &tty_list, t_list) { 1150 tty_lock(tp); 1151 tty_to_xtty(tp, xt); 1152 tty_unlock(tp); 1153 xt++; 1154 } 1155 sx_sunlock(&tty_list_sx); 1156 1157 error = SYSCTL_OUT(req, xtlist, lsize); 1158 free(xtlist, M_TTY); 1159 return (error); 1160 } 1161 1162 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 1163 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs"); 1164 1165 /* 1166 * Device node creation. Device has been set up, now we can expose it to 1167 * the user. 1168 */ 1169 1170 void 1171 tty_makedev(struct tty *tp, struct ucred *cred, const char *fmt, ...) 1172 { 1173 va_list ap; 1174 struct cdev *dev; 1175 const char *prefix = "tty"; 1176 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */ 1177 uid_t uid; 1178 gid_t gid; 1179 mode_t mode; 1180 1181 /* Remove "tty" prefix from devices like PTY's. */ 1182 if (tp->t_flags & TF_NOPREFIX) 1183 prefix = ""; 1184 1185 va_start(ap, fmt); 1186 vsnrprintf(name, sizeof name, 32, fmt, ap); 1187 va_end(ap); 1188 1189 if (cred == NULL) { 1190 /* System device. */ 1191 uid = UID_ROOT; 1192 gid = GID_WHEEL; 1193 mode = S_IRUSR|S_IWUSR; 1194 } else { 1195 /* User device. */ 1196 uid = cred->cr_ruid; 1197 gid = GID_TTY; 1198 mode = S_IRUSR|S_IWUSR|S_IWGRP; 1199 } 1200 1201 /* Master call-in device. */ 1202 dev = make_dev_cred(&ttydev_cdevsw, 0, cred, 1203 uid, gid, mode, "%s%s", prefix, name); 1204 dev->si_drv1 = tp; 1205 tp->t_dev = dev; 1206 1207 /* Slave call-in devices. */ 1208 if (tp->t_flags & TF_INITLOCK) { 1209 dev = make_dev_cred(&ttyil_cdevsw, TTYUNIT_INIT, cred, 1210 uid, gid, mode, "%s%s.init", prefix, name); 1211 dev_depends(tp->t_dev, dev); 1212 dev->si_drv1 = tp; 1213 dev->si_drv2 = &tp->t_termios_init_in; 1214 1215 dev = make_dev_cred(&ttyil_cdevsw, TTYUNIT_LOCK, cred, 1216 uid, gid, mode, "%s%s.lock", prefix, name); 1217 dev_depends(tp->t_dev, dev); 1218 dev->si_drv1 = tp; 1219 dev->si_drv2 = &tp->t_termios_lock_in; 1220 } 1221 1222 /* Call-out devices. */ 1223 if (tp->t_flags & TF_CALLOUT) { 1224 dev = make_dev_cred(&ttydev_cdevsw, TTYUNIT_CALLOUT, cred, 1225 UID_UUCP, GID_DIALER, 0660, "cua%s", name); 1226 dev_depends(tp->t_dev, dev); 1227 dev->si_drv1 = tp; 1228 1229 /* Slave call-out devices. */ 1230 if (tp->t_flags & TF_INITLOCK) { 1231 dev = make_dev_cred(&ttyil_cdevsw, 1232 TTYUNIT_CALLOUT | TTYUNIT_INIT, cred, 1233 UID_UUCP, GID_DIALER, 0660, "cua%s.init", name); 1234 dev_depends(tp->t_dev, dev); 1235 dev->si_drv1 = tp; 1236 dev->si_drv2 = &tp->t_termios_init_out; 1237 1238 dev = make_dev_cred(&ttyil_cdevsw, 1239 TTYUNIT_CALLOUT | TTYUNIT_LOCK, cred, 1240 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", name); 1241 dev_depends(tp->t_dev, dev); 1242 dev->si_drv1 = tp; 1243 dev->si_drv2 = &tp->t_termios_lock_out; 1244 } 1245 } 1246 } 1247 1248 /* 1249 * Signalling processes. 1250 */ 1251 1252 void 1253 tty_signal_sessleader(struct tty *tp, int sig) 1254 { 1255 struct proc *p; 1256 1257 tty_lock_assert(tp, MA_OWNED); 1258 MPASS(sig >= 1 && sig < NSIG); 1259 1260 /* Make signals start output again. */ 1261 tp->t_flags &= ~TF_STOPPED; 1262 1263 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) { 1264 p = tp->t_session->s_leader; 1265 PROC_LOCK(p); 1266 psignal(p, sig); 1267 PROC_UNLOCK(p); 1268 } 1269 } 1270 1271 void 1272 tty_signal_pgrp(struct tty *tp, int sig) 1273 { 1274 ksiginfo_t ksi; 1275 1276 tty_lock_assert(tp, MA_OWNED); 1277 MPASS(sig >= 1 && sig < NSIG); 1278 1279 /* Make signals start output again. */ 1280 tp->t_flags &= ~TF_STOPPED; 1281 1282 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO)) 1283 tty_info(tp); 1284 if (tp->t_pgrp != NULL) { 1285 ksiginfo_init(&ksi); 1286 ksi.ksi_signo = sig; 1287 ksi.ksi_code = SI_KERNEL; 1288 PGRP_LOCK(tp->t_pgrp); 1289 pgsignal(tp->t_pgrp, sig, 1, &ksi); 1290 PGRP_UNLOCK(tp->t_pgrp); 1291 } 1292 } 1293 1294 void 1295 tty_wakeup(struct tty *tp, int flags) 1296 { 1297 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL) 1298 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 1299 1300 if (flags & FWRITE) { 1301 cv_broadcast(&tp->t_outwait); 1302 selwakeup(&tp->t_outpoll); 1303 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0); 1304 } 1305 if (flags & FREAD) { 1306 cv_broadcast(&tp->t_inwait); 1307 selwakeup(&tp->t_inpoll); 1308 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0); 1309 } 1310 } 1311 1312 int 1313 tty_wait(struct tty *tp, struct cv *cv) 1314 { 1315 int error; 1316 int revokecnt = tp->t_revokecnt; 1317 1318 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1319 MPASS(!tty_gone(tp)); 1320 1321 error = cv_wait_sig(cv, tp->t_mtx); 1322 1323 /* Restart the system call when we may have been revoked. */ 1324 if (tp->t_revokecnt != revokecnt) 1325 return (ERESTART); 1326 1327 /* Bail out when the device slipped away. */ 1328 if (tty_gone(tp)) 1329 return (ENXIO); 1330 1331 return (error); 1332 } 1333 1334 int 1335 tty_timedwait(struct tty *tp, struct cv *cv, int hz) 1336 { 1337 int error; 1338 int revokecnt = tp->t_revokecnt; 1339 1340 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1341 MPASS(!tty_gone(tp)); 1342 1343 error = cv_timedwait_sig(cv, tp->t_mtx, hz); 1344 1345 /* Restart the system call when we may have been revoked. */ 1346 if (tp->t_revokecnt != revokecnt) 1347 return (ERESTART); 1348 1349 /* Bail out when the device slipped away. */ 1350 if (tty_gone(tp)) 1351 return (ENXIO); 1352 1353 return (error); 1354 } 1355 1356 void 1357 tty_flush(struct tty *tp, int flags) 1358 { 1359 if (flags & FWRITE) { 1360 tp->t_flags &= ~TF_HIWAT_OUT; 1361 ttyoutq_flush(&tp->t_outq); 1362 tty_wakeup(tp, FWRITE); 1363 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE); 1364 } 1365 if (flags & FREAD) { 1366 tty_hiwat_in_unblock(tp); 1367 ttyinq_flush(&tp->t_inq); 1368 ttydevsw_inwakeup(tp); 1369 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD); 1370 } 1371 } 1372 1373 static int 1374 tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, 1375 struct thread *td) 1376 { 1377 int error; 1378 1379 switch (cmd) { 1380 /* 1381 * Modem commands. 1382 * The SER_* and TIOCM_* flags are the same, but one bit 1383 * shifted. I don't know why. 1384 */ 1385 case TIOCSDTR: 1386 ttydevsw_modem(tp, SER_DTR, 0); 1387 return (0); 1388 case TIOCCDTR: 1389 ttydevsw_modem(tp, 0, SER_DTR); 1390 return (0); 1391 case TIOCMSET: { 1392 int bits = *(int *)data; 1393 ttydevsw_modem(tp, 1394 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 1395 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1396 return (0); 1397 } 1398 case TIOCMBIS: { 1399 int bits = *(int *)data; 1400 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0); 1401 return (0); 1402 } 1403 case TIOCMBIC: { 1404 int bits = *(int *)data; 1405 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1406 return (0); 1407 } 1408 case TIOCMGET: 1409 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1); 1410 return (0); 1411 1412 case FIOASYNC: 1413 if (*(int *)data) 1414 tp->t_flags |= TF_ASYNC; 1415 else 1416 tp->t_flags &= ~TF_ASYNC; 1417 return (0); 1418 case FIONBIO: 1419 /* This device supports non-blocking operation. */ 1420 return (0); 1421 case FIONREAD: 1422 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq); 1423 return (0); 1424 case FIONWRITE: 1425 case TIOCOUTQ: 1426 *(int *)data = ttyoutq_bytesused(&tp->t_outq); 1427 return (0); 1428 case FIOSETOWN: 1429 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1430 /* Not allowed to set ownership. */ 1431 return (ENOTTY); 1432 1433 /* Temporarily unlock the TTY to set ownership. */ 1434 tty_unlock(tp); 1435 error = fsetown(*(int *)data, &tp->t_sigio); 1436 tty_lock(tp); 1437 return (error); 1438 case FIOGETOWN: 1439 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1440 /* Not allowed to set ownership. */ 1441 return (ENOTTY); 1442 1443 /* Get ownership. */ 1444 *(int *)data = fgetown(&tp->t_sigio); 1445 return (0); 1446 case TIOCGETA: 1447 /* Obtain terminal flags through tcgetattr(). */ 1448 *(struct termios*)data = tp->t_termios; 1449 return (0); 1450 case TIOCSETA: 1451 case TIOCSETAW: 1452 case TIOCSETAF: { 1453 struct termios *t = data; 1454 1455 /* 1456 * Who makes up these funny rules? According to POSIX, 1457 * input baud rate is set equal to the output baud rate 1458 * when zero. 1459 */ 1460 if (t->c_ispeed == 0) 1461 t->c_ispeed = t->c_ospeed; 1462 1463 /* Discard any unsupported bits. */ 1464 t->c_iflag &= TTYSUP_IFLAG; 1465 t->c_oflag &= TTYSUP_OFLAG; 1466 t->c_lflag &= TTYSUP_LFLAG; 1467 t->c_cflag &= TTYSUP_CFLAG; 1468 1469 /* Set terminal flags through tcsetattr(). */ 1470 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1471 error = tty_drain(tp); 1472 if (error) 1473 return (error); 1474 if (cmd == TIOCSETAF) 1475 tty_flush(tp, FREAD); 1476 } 1477 1478 /* 1479 * Only call param() when the flags really change. 1480 */ 1481 if ((t->c_cflag & CIGNORE) == 0 && 1482 (tp->t_termios.c_cflag != t->c_cflag || 1483 tp->t_termios.c_ispeed != t->c_ispeed || 1484 tp->t_termios.c_ospeed != t->c_ospeed)) { 1485 error = ttydevsw_param(tp, t); 1486 if (error) 1487 return (error); 1488 1489 /* XXX: CLOCAL? */ 1490 1491 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE; 1492 tp->t_termios.c_ispeed = t->c_ispeed; 1493 tp->t_termios.c_ospeed = t->c_ospeed; 1494 1495 /* Baud rate has changed - update watermarks. */ 1496 tty_watermarks(tp); 1497 } 1498 1499 /* Copy new non-device driver parameters. */ 1500 tp->t_termios.c_iflag = t->c_iflag; 1501 tp->t_termios.c_oflag = t->c_oflag; 1502 tp->t_termios.c_lflag = t->c_lflag; 1503 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc); 1504 1505 ttydisc_optimize(tp); 1506 1507 if ((t->c_lflag & ICANON) == 0) { 1508 /* 1509 * When in non-canonical mode, wake up all 1510 * readers. Canonicalize any partial input. VMIN 1511 * and VTIME could also be adjusted. 1512 */ 1513 ttyinq_canonicalize(&tp->t_inq); 1514 tty_wakeup(tp, FREAD); 1515 } 1516 1517 /* 1518 * For packet mode: notify the PTY consumer that VSTOP 1519 * and VSTART may have been changed. 1520 */ 1521 if (tp->t_termios.c_iflag & IXON && 1522 tp->t_termios.c_cc[VSTOP] == CTRL('S') && 1523 tp->t_termios.c_cc[VSTART] == CTRL('Q')) 1524 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP); 1525 else 1526 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP); 1527 return (0); 1528 } 1529 case TIOCGETD: 1530 /* For compatibility - we only support TTYDISC. */ 1531 *(int *)data = TTYDISC; 1532 return (0); 1533 case TIOCGPGRP: 1534 if (!tty_is_ctty(tp, td->td_proc)) 1535 return (ENOTTY); 1536 1537 if (tp->t_pgrp != NULL) 1538 *(int *)data = tp->t_pgrp->pg_id; 1539 else 1540 *(int *)data = NO_PID; 1541 return (0); 1542 case TIOCGSID: 1543 if (!tty_is_ctty(tp, td->td_proc)) 1544 return (ENOTTY); 1545 1546 MPASS(tp->t_session); 1547 *(int *)data = tp->t_session->s_sid; 1548 return (0); 1549 case TIOCSCTTY: { 1550 struct proc *p = td->td_proc; 1551 1552 /* XXX: This looks awful. */ 1553 tty_unlock(tp); 1554 sx_xlock(&proctree_lock); 1555 tty_lock(tp); 1556 1557 if (!SESS_LEADER(p)) { 1558 /* Only the session leader may do this. */ 1559 sx_xunlock(&proctree_lock); 1560 return (EPERM); 1561 } 1562 1563 if (tp->t_session != NULL && tp->t_session == p->p_session) { 1564 /* This is already our controlling TTY. */ 1565 sx_xunlock(&proctree_lock); 1566 return (0); 1567 } 1568 1569 if (p->p_session->s_ttyp != NULL || 1570 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL && 1571 tp->t_session->s_ttyvp->v_type != VBAD)) { 1572 /* 1573 * There is already a relation between a TTY and 1574 * a session, or the caller is not the session 1575 * leader. 1576 * 1577 * Allow the TTY to be stolen when the vnode is 1578 * invalid, but the reference to the TTY is 1579 * still active. This allows immediate reuse of 1580 * TTYs of which the session leader has been 1581 * killed or the TTY revoked. 1582 */ 1583 sx_xunlock(&proctree_lock); 1584 return (EPERM); 1585 } 1586 1587 /* Connect the session to the TTY. */ 1588 tp->t_session = p->p_session; 1589 tp->t_session->s_ttyp = tp; 1590 tp->t_sessioncnt++; 1591 sx_xunlock(&proctree_lock); 1592 1593 /* Assign foreground process group. */ 1594 tp->t_pgrp = p->p_pgrp; 1595 PROC_LOCK(p); 1596 p->p_flag |= P_CONTROLT; 1597 PROC_UNLOCK(p); 1598 1599 return (0); 1600 } 1601 case TIOCSPGRP: { 1602 struct pgrp *pg; 1603 1604 /* 1605 * XXX: Temporarily unlock the TTY to locate the process 1606 * group. This code would be lot nicer if we would ever 1607 * decompose proctree_lock. 1608 */ 1609 tty_unlock(tp); 1610 sx_slock(&proctree_lock); 1611 pg = pgfind(*(int *)data); 1612 if (pg != NULL) 1613 PGRP_UNLOCK(pg); 1614 if (pg == NULL || pg->pg_session != td->td_proc->p_session) { 1615 sx_sunlock(&proctree_lock); 1616 tty_lock(tp); 1617 return (EPERM); 1618 } 1619 tty_lock(tp); 1620 1621 /* 1622 * Determine if this TTY is the controlling TTY after 1623 * relocking the TTY. 1624 */ 1625 if (!tty_is_ctty(tp, td->td_proc)) { 1626 sx_sunlock(&proctree_lock); 1627 return (ENOTTY); 1628 } 1629 tp->t_pgrp = pg; 1630 sx_sunlock(&proctree_lock); 1631 1632 /* Wake up the background process groups. */ 1633 cv_broadcast(&tp->t_bgwait); 1634 return (0); 1635 } 1636 case TIOCFLUSH: { 1637 int flags = *(int *)data; 1638 1639 if (flags == 0) 1640 flags = (FREAD|FWRITE); 1641 else 1642 flags &= (FREAD|FWRITE); 1643 tty_flush(tp, flags); 1644 return (0); 1645 } 1646 case TIOCDRAIN: 1647 /* Drain TTY output. */ 1648 return tty_drain(tp); 1649 case TIOCCONS: 1650 /* Set terminal as console TTY. */ 1651 if (*(int *)data) { 1652 error = priv_check(td, PRIV_TTY_CONSOLE); 1653 if (error) 1654 return (error); 1655 1656 /* 1657 * XXX: constty should really need to be locked! 1658 * XXX: allow disconnected constty's to be stolen! 1659 */ 1660 1661 if (constty == tp) 1662 return (0); 1663 if (constty != NULL) 1664 return (EBUSY); 1665 1666 tty_unlock(tp); 1667 constty_set(tp); 1668 tty_lock(tp); 1669 } else if (constty == tp) { 1670 constty_clear(); 1671 } 1672 return (0); 1673 case TIOCGWINSZ: 1674 /* Obtain window size. */ 1675 *(struct winsize*)data = tp->t_winsize; 1676 return (0); 1677 case TIOCSWINSZ: 1678 /* Set window size. */ 1679 if (bcmp(&tp->t_winsize, data, sizeof(struct winsize)) == 0) 1680 return (0); 1681 tp->t_winsize = *(struct winsize*)data; 1682 tty_signal_pgrp(tp, SIGWINCH); 1683 return (0); 1684 case TIOCEXCL: 1685 tp->t_flags |= TF_EXCLUDE; 1686 return (0); 1687 case TIOCNXCL: 1688 tp->t_flags &= ~TF_EXCLUDE; 1689 return (0); 1690 case TIOCSTOP: 1691 tp->t_flags |= TF_STOPPED; 1692 ttydevsw_pktnotify(tp, TIOCPKT_STOP); 1693 return (0); 1694 case TIOCSTART: 1695 tp->t_flags &= ~TF_STOPPED; 1696 ttydevsw_outwakeup(tp); 1697 ttydevsw_pktnotify(tp, TIOCPKT_START); 1698 return (0); 1699 case TIOCSTAT: 1700 tty_info(tp); 1701 return (0); 1702 case TIOCSTI: 1703 if ((fflag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI)) 1704 return (EPERM); 1705 if (!tty_is_ctty(tp, td->td_proc) && 1706 priv_check(td, PRIV_TTY_STI)) 1707 return (EACCES); 1708 ttydisc_rint(tp, *(char *)data, 0); 1709 ttydisc_rint_done(tp); 1710 return (0); 1711 } 1712 1713 #ifdef COMPAT_43TTY 1714 return tty_ioctl_compat(tp, cmd, data, fflag, td); 1715 #else /* !COMPAT_43TTY */ 1716 return (ENOIOCTL); 1717 #endif /* COMPAT_43TTY */ 1718 } 1719 1720 int 1721 tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, struct thread *td) 1722 { 1723 int error; 1724 1725 tty_lock_assert(tp, MA_OWNED); 1726 1727 if (tty_gone(tp)) 1728 return (ENXIO); 1729 1730 error = ttydevsw_ioctl(tp, cmd, data, td); 1731 if (error == ENOIOCTL) 1732 error = tty_generic_ioctl(tp, cmd, data, fflag, td); 1733 1734 return (error); 1735 } 1736 1737 dev_t 1738 tty_udev(struct tty *tp) 1739 { 1740 if (tp->t_dev) 1741 return dev2udev(tp->t_dev); 1742 else 1743 return NODEV; 1744 } 1745 1746 int 1747 tty_checkoutq(struct tty *tp) 1748 { 1749 1750 /* 256 bytes should be enough to print a log message. */ 1751 return (ttyoutq_bytesleft(&tp->t_outq) >= 256); 1752 } 1753 1754 void 1755 tty_hiwat_in_block(struct tty *tp) 1756 { 1757 1758 if ((tp->t_flags & TF_HIWAT_IN) == 0 && 1759 tp->t_termios.c_iflag & IXOFF && 1760 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) { 1761 /* 1762 * Input flow control. Only enter the high watermark when we 1763 * can successfully store the VSTOP character. 1764 */ 1765 if (ttyoutq_write_nofrag(&tp->t_outq, 1766 &tp->t_termios.c_cc[VSTOP], 1) == 0) 1767 tp->t_flags |= TF_HIWAT_IN; 1768 } else { 1769 /* No input flow control. */ 1770 tp->t_flags |= TF_HIWAT_IN; 1771 } 1772 } 1773 1774 void 1775 tty_hiwat_in_unblock(struct tty *tp) 1776 { 1777 1778 if (tp->t_flags & TF_HIWAT_IN && 1779 tp->t_termios.c_iflag & IXOFF && 1780 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) { 1781 /* 1782 * Input flow control. Only leave the high watermark when we 1783 * can successfully store the VSTART character. 1784 */ 1785 if (ttyoutq_write_nofrag(&tp->t_outq, 1786 &tp->t_termios.c_cc[VSTART], 1) == 0) 1787 tp->t_flags &= ~TF_HIWAT_IN; 1788 } else { 1789 /* No input flow control. */ 1790 tp->t_flags &= ~TF_HIWAT_IN; 1791 } 1792 1793 if (!tty_gone(tp)) 1794 ttydevsw_inwakeup(tp); 1795 } 1796 1797 /* 1798 * TTY hooks interface. 1799 */ 1800 1801 static int 1802 ttyhook_defrint(struct tty *tp, char c, int flags) 1803 { 1804 1805 if (ttyhook_rint_bypass(tp, &c, 1) != 1) 1806 return (-1); 1807 1808 return (0); 1809 } 1810 1811 int 1812 ttyhook_register(struct tty **rtp, struct proc *p, int fd, 1813 struct ttyhook *th, void *softc) 1814 { 1815 struct tty *tp; 1816 struct file *fp; 1817 #ifdef CAPABILITIES 1818 struct file *fp_cap; 1819 #endif 1820 struct cdev *dev; 1821 struct cdevsw *cdp; 1822 struct filedesc *fdp; 1823 int error, ref; 1824 1825 /* Validate the file descriptor. */ 1826 if ((fdp = p->p_fd) == NULL) 1827 return (EBADF); 1828 1829 fp = fget_unlocked(fdp, fd); 1830 if (fp == NULL) 1831 return (EBADF); 1832 if (fp->f_ops == &badfileops) { 1833 error = EBADF; 1834 goto done1; 1835 } 1836 1837 #ifdef CAPABILITIES 1838 fp_cap = fp; 1839 error = cap_funwrap(fp_cap, CAP_TTYHOOK, &fp); 1840 if (error) 1841 return (error); 1842 #endif 1843 1844 /* 1845 * Make sure the vnode is bound to a character device. 1846 * Unlocked check for the vnode type is ok there, because we 1847 * only shall prevent calling devvn_refthread on the file that 1848 * never has been opened over a character device. 1849 */ 1850 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) { 1851 error = EINVAL; 1852 goto done1; 1853 } 1854 1855 /* Make sure it is a TTY. */ 1856 cdp = devvn_refthread(fp->f_vnode, &dev, &ref); 1857 if (cdp == NULL) { 1858 error = ENXIO; 1859 goto done1; 1860 } 1861 if (dev != fp->f_data) { 1862 error = ENXIO; 1863 goto done2; 1864 } 1865 if (cdp != &ttydev_cdevsw) { 1866 error = ENOTTY; 1867 goto done2; 1868 } 1869 tp = dev->si_drv1; 1870 1871 /* Try to attach the hook to the TTY. */ 1872 error = EBUSY; 1873 tty_lock(tp); 1874 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0)); 1875 if (tp->t_flags & TF_HOOK) 1876 goto done3; 1877 1878 tp->t_flags |= TF_HOOK; 1879 tp->t_hook = th; 1880 tp->t_hooksoftc = softc; 1881 *rtp = tp; 1882 error = 0; 1883 1884 /* Maybe we can switch into bypass mode now. */ 1885 ttydisc_optimize(tp); 1886 1887 /* Silently convert rint() calls to rint_bypass() when possible. */ 1888 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass)) 1889 th->th_rint = ttyhook_defrint; 1890 1891 done3: tty_unlock(tp); 1892 done2: dev_relthread(dev, ref); 1893 done1: fdrop(fp, curthread); 1894 return (error); 1895 } 1896 1897 void 1898 ttyhook_unregister(struct tty *tp) 1899 { 1900 1901 tty_lock_assert(tp, MA_OWNED); 1902 MPASS(tp->t_flags & TF_HOOK); 1903 1904 /* Disconnect the hook. */ 1905 tp->t_flags &= ~TF_HOOK; 1906 tp->t_hook = NULL; 1907 1908 /* Maybe we need to leave bypass mode. */ 1909 ttydisc_optimize(tp); 1910 1911 /* Maybe deallocate the TTY as well. */ 1912 tty_rel_free(tp); 1913 } 1914 1915 /* 1916 * /dev/console handling. 1917 */ 1918 1919 static int 1920 ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 1921 { 1922 struct tty *tp; 1923 1924 /* System has no console device. */ 1925 if (dev_console_filename == NULL) 1926 return (ENXIO); 1927 1928 /* Look up corresponding TTY by device name. */ 1929 sx_slock(&tty_list_sx); 1930 TAILQ_FOREACH(tp, &tty_list, t_list) { 1931 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) { 1932 dev_console->si_drv1 = tp; 1933 break; 1934 } 1935 } 1936 sx_sunlock(&tty_list_sx); 1937 1938 /* System console has no TTY associated. */ 1939 if (dev_console->si_drv1 == NULL) 1940 return (ENXIO); 1941 1942 return (ttydev_open(dev, oflags, devtype, td)); 1943 } 1944 1945 static int 1946 ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag) 1947 { 1948 1949 log_console(uio); 1950 1951 return (ttydev_write(dev, uio, ioflag)); 1952 } 1953 1954 /* 1955 * /dev/console is a little different than normal TTY's. When opened, 1956 * it determines which TTY to use. When data gets written to it, it 1957 * will be logged in the kernel message buffer. 1958 */ 1959 static struct cdevsw ttyconsdev_cdevsw = { 1960 .d_version = D_VERSION, 1961 .d_open = ttyconsdev_open, 1962 .d_close = ttydev_close, 1963 .d_read = ttydev_read, 1964 .d_write = ttyconsdev_write, 1965 .d_ioctl = ttydev_ioctl, 1966 .d_kqfilter = ttydev_kqfilter, 1967 .d_poll = ttydev_poll, 1968 .d_mmap = ttydev_mmap, 1969 .d_name = "ttyconsdev", 1970 .d_flags = D_TTY, 1971 }; 1972 1973 static void 1974 ttyconsdev_init(void *unused) 1975 { 1976 1977 dev_console = make_dev_credf(MAKEDEV_ETERNAL, &ttyconsdev_cdevsw, 0, 1978 NULL, UID_ROOT, GID_WHEEL, 0600, "console"); 1979 } 1980 1981 SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL); 1982 1983 void 1984 ttyconsdev_select(const char *name) 1985 { 1986 1987 dev_console_filename = name; 1988 } 1989 1990 /* 1991 * Debugging routines. 1992 */ 1993 1994 #include "opt_ddb.h" 1995 #ifdef DDB 1996 #include <ddb/ddb.h> 1997 #include <ddb/db_sym.h> 1998 1999 static struct { 2000 int flag; 2001 char val; 2002 } ttystates[] = { 2003 #if 0 2004 { TF_NOPREFIX, 'N' }, 2005 #endif 2006 { TF_INITLOCK, 'I' }, 2007 { TF_CALLOUT, 'C' }, 2008 2009 /* Keep these together -> 'Oi' and 'Oo'. */ 2010 { TF_OPENED, 'O' }, 2011 { TF_OPENED_IN, 'i' }, 2012 { TF_OPENED_OUT, 'o' }, 2013 { TF_OPENED_CONS, 'c' }, 2014 2015 { TF_GONE, 'G' }, 2016 { TF_OPENCLOSE, 'B' }, 2017 { TF_ASYNC, 'Y' }, 2018 { TF_LITERAL, 'L' }, 2019 2020 /* Keep these together -> 'Hi' and 'Ho'. */ 2021 { TF_HIWAT, 'H' }, 2022 { TF_HIWAT_IN, 'i' }, 2023 { TF_HIWAT_OUT, 'o' }, 2024 2025 { TF_STOPPED, 'S' }, 2026 { TF_EXCLUDE, 'X' }, 2027 { TF_BYPASS, 'l' }, 2028 { TF_ZOMBIE, 'Z' }, 2029 { TF_HOOK, 's' }, 2030 2031 /* Keep these together -> 'bi' and 'bo'. */ 2032 { TF_BUSY, 'b' }, 2033 { TF_BUSY_IN, 'i' }, 2034 { TF_BUSY_OUT, 'o' }, 2035 2036 { 0, '\0'}, 2037 }; 2038 2039 #define TTY_FLAG_BITS \ 2040 "\20\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \ 2041 "\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \ 2042 "\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK" 2043 2044 #define DB_PRINTSYM(name, addr) \ 2045 db_printf("%s " #name ": ", sep); \ 2046 db_printsym((db_addr_t) addr, DB_STGY_ANY); \ 2047 db_printf("\n"); 2048 2049 static void 2050 _db_show_devsw(const char *sep, const struct ttydevsw *tsw) 2051 { 2052 db_printf("%sdevsw: ", sep); 2053 db_printsym((db_addr_t)tsw, DB_STGY_ANY); 2054 db_printf(" (%p)\n", tsw); 2055 DB_PRINTSYM(open, tsw->tsw_open); 2056 DB_PRINTSYM(close, tsw->tsw_close); 2057 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup); 2058 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup); 2059 DB_PRINTSYM(ioctl, tsw->tsw_ioctl); 2060 DB_PRINTSYM(param, tsw->tsw_param); 2061 DB_PRINTSYM(modem, tsw->tsw_modem); 2062 DB_PRINTSYM(mmap, tsw->tsw_mmap); 2063 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify); 2064 DB_PRINTSYM(free, tsw->tsw_free); 2065 } 2066 static void 2067 _db_show_hooks(const char *sep, const struct ttyhook *th) 2068 { 2069 db_printf("%shook: ", sep); 2070 db_printsym((db_addr_t)th, DB_STGY_ANY); 2071 db_printf(" (%p)\n", th); 2072 if (th == NULL) 2073 return; 2074 DB_PRINTSYM(rint, th->th_rint); 2075 DB_PRINTSYM(rint_bypass, th->th_rint_bypass); 2076 DB_PRINTSYM(rint_done, th->th_rint_done); 2077 DB_PRINTSYM(rint_poll, th->th_rint_poll); 2078 DB_PRINTSYM(getc_inject, th->th_getc_inject); 2079 DB_PRINTSYM(getc_capture, th->th_getc_capture); 2080 DB_PRINTSYM(getc_poll, th->th_getc_poll); 2081 DB_PRINTSYM(close, th->th_close); 2082 } 2083 2084 static void 2085 _db_show_termios(const char *name, const struct termios *t) 2086 { 2087 2088 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x " 2089 "lflag 0x%x ispeed %u ospeed %u\n", name, 2090 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag, 2091 t->c_ispeed, t->c_ospeed); 2092 } 2093 2094 /* DDB command to show TTY statistics. */ 2095 DB_SHOW_COMMAND(tty, db_show_tty) 2096 { 2097 struct tty *tp; 2098 2099 if (!have_addr) { 2100 db_printf("usage: show tty <addr>\n"); 2101 return; 2102 } 2103 tp = (struct tty *)addr; 2104 2105 db_printf("0x%p: %s\n", tp, tty_devname(tp)); 2106 db_printf("\tmtx: %p\n", tp->t_mtx); 2107 db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS); 2108 db_printf("\trevokecnt: %u\n", tp->t_revokecnt); 2109 2110 /* Buffering mechanisms. */ 2111 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u " 2112 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin, 2113 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end, 2114 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota); 2115 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n", 2116 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end, 2117 tp->t_outq.to_nblocks, tp->t_outq.to_quota); 2118 db_printf("\tinlow: %zu\n", tp->t_inlow); 2119 db_printf("\toutlow: %zu\n", tp->t_outlow); 2120 _db_show_termios("\ttermios", &tp->t_termios); 2121 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n", 2122 tp->t_winsize.ws_row, tp->t_winsize.ws_col, 2123 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel); 2124 db_printf("\tcolumn: %u\n", tp->t_column); 2125 db_printf("\twritepos: %u\n", tp->t_writepos); 2126 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags); 2127 2128 /* Init/lock-state devices. */ 2129 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in); 2130 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out); 2131 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in); 2132 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out); 2133 2134 /* Hooks */ 2135 _db_show_devsw("\t", tp->t_devsw); 2136 _db_show_hooks("\t", tp->t_hook); 2137 2138 /* Process info. */ 2139 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp, 2140 tp->t_pgrp ? tp->t_pgrp->pg_id : 0, 2141 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0); 2142 db_printf("\tsession: %p", tp->t_session); 2143 if (tp->t_session != NULL) 2144 db_printf(" count %u leader %p tty %p sid %d login %s", 2145 tp->t_session->s_count, tp->t_session->s_leader, 2146 tp->t_session->s_ttyp, tp->t_session->s_sid, 2147 tp->t_session->s_login); 2148 db_printf("\n"); 2149 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt); 2150 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc); 2151 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc); 2152 db_printf("\tdev: %p\n", tp->t_dev); 2153 } 2154 2155 /* DDB command to list TTYs. */ 2156 DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys) 2157 { 2158 struct tty *tp; 2159 size_t isiz, osiz; 2160 int i, j; 2161 2162 /* Make the output look like `pstat -t'. */ 2163 db_printf("PTR "); 2164 #if defined(__LP64__) 2165 db_printf(" "); 2166 #endif 2167 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW " 2168 "COL SESS PGID STATE\n"); 2169 2170 TAILQ_FOREACH(tp, &tty_list, t_list) { 2171 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE; 2172 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE; 2173 2174 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ", 2175 tp, 2176 tty_devname(tp), 2177 isiz, 2178 tp->t_inq.ti_linestart - tp->t_inq.ti_begin, 2179 tp->t_inq.ti_end - tp->t_inq.ti_linestart, 2180 isiz - tp->t_inlow, 2181 osiz, 2182 tp->t_outq.to_end - tp->t_outq.to_begin, 2183 osiz - tp->t_outlow, 2184 MIN(tp->t_column, 99999), 2185 tp->t_session ? tp->t_session->s_sid : 0, 2186 tp->t_pgrp ? tp->t_pgrp->pg_id : 0); 2187 2188 /* Flag bits. */ 2189 for (i = j = 0; ttystates[i].flag; i++) 2190 if (tp->t_flags & ttystates[i].flag) { 2191 db_printf("%c", ttystates[i].val); 2192 j++; 2193 } 2194 if (j == 0) 2195 db_printf("-"); 2196 db_printf("\n"); 2197 } 2198 } 2199 #endif /* DDB */ 2200