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