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 { 1, NULL, tty_kqops_read_detach, tty_kqops_read_event }; 675 static struct filterops tty_kqops_write = 676 { 1, NULL, tty_kqops_write_detach, tty_kqops_write_event }; 677 678 static int 679 ttydev_kqfilter(struct cdev *dev, struct knote *kn) 680 { 681 struct tty *tp = dev->si_drv1; 682 int error; 683 684 error = ttydev_enter(tp); 685 if (error) 686 return (error); 687 688 switch (kn->kn_filter) { 689 case EVFILT_READ: 690 kn->kn_hook = tp; 691 kn->kn_fop = &tty_kqops_read; 692 knlist_add(&tp->t_inpoll.si_note, kn, 1); 693 break; 694 case EVFILT_WRITE: 695 kn->kn_hook = tp; 696 kn->kn_fop = &tty_kqops_write; 697 knlist_add(&tp->t_outpoll.si_note, kn, 1); 698 break; 699 default: 700 error = EINVAL; 701 break; 702 } 703 704 tty_unlock(tp); 705 return (error); 706 } 707 708 static struct cdevsw ttydev_cdevsw = { 709 .d_version = D_VERSION, 710 .d_open = ttydev_open, 711 .d_close = ttydev_close, 712 .d_read = ttydev_read, 713 .d_write = ttydev_write, 714 .d_ioctl = ttydev_ioctl, 715 .d_kqfilter = ttydev_kqfilter, 716 .d_poll = ttydev_poll, 717 .d_mmap = ttydev_mmap, 718 .d_name = "ttydev", 719 .d_flags = D_TTY, 720 }; 721 722 /* 723 * Init/lock-state devices 724 */ 725 726 static int 727 ttyil_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 728 { 729 struct tty *tp = dev->si_drv1; 730 int error = 0; 731 732 tty_lock(tp); 733 if (tty_gone(tp)) 734 error = ENODEV; 735 tty_unlock(tp); 736 737 return (error); 738 } 739 740 static int 741 ttyil_close(struct cdev *dev, int flag, int mode, struct thread *td) 742 { 743 return (0); 744 } 745 746 static int 747 ttyil_rdwr(struct cdev *dev, struct uio *uio, int ioflag) 748 { 749 return (ENODEV); 750 } 751 752 static int 753 ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 754 struct thread *td) 755 { 756 struct tty *tp = dev->si_drv1; 757 int error = 0; 758 759 tty_lock(tp); 760 if (tty_gone(tp)) { 761 error = ENODEV; 762 goto done; 763 } 764 765 switch (cmd) { 766 case TIOCGETA: 767 /* Obtain terminal flags through tcgetattr(). */ 768 *(struct termios*)data = *(struct termios*)dev->si_drv2; 769 break; 770 case TIOCSETA: 771 /* Set terminal flags through tcsetattr(). */ 772 error = priv_check(td, PRIV_TTY_SETA); 773 if (error) 774 break; 775 *(struct termios*)dev->si_drv2 = *(struct termios*)data; 776 break; 777 case TIOCGETD: 778 *(int *)data = TTYDISC; 779 break; 780 case TIOCGWINSZ: 781 bzero(data, sizeof(struct winsize)); 782 break; 783 default: 784 error = ENOTTY; 785 } 786 787 done: tty_unlock(tp); 788 return (error); 789 } 790 791 static struct cdevsw ttyil_cdevsw = { 792 .d_version = D_VERSION, 793 .d_open = ttyil_open, 794 .d_close = ttyil_close, 795 .d_read = ttyil_rdwr, 796 .d_write = ttyil_rdwr, 797 .d_ioctl = ttyil_ioctl, 798 .d_name = "ttyil", 799 .d_flags = D_TTY, 800 }; 801 802 static void 803 tty_init_termios(struct tty *tp) 804 { 805 struct termios *t = &tp->t_termios_init_in; 806 807 t->c_cflag = TTYDEF_CFLAG; 808 t->c_iflag = TTYDEF_IFLAG; 809 t->c_lflag = TTYDEF_LFLAG; 810 t->c_oflag = TTYDEF_OFLAG; 811 t->c_ispeed = TTYDEF_SPEED; 812 t->c_ospeed = TTYDEF_SPEED; 813 memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars); 814 815 tp->t_termios_init_out = *t; 816 } 817 818 void 819 tty_init_console(struct tty *tp, speed_t s) 820 { 821 struct termios *ti = &tp->t_termios_init_in; 822 struct termios *to = &tp->t_termios_init_out; 823 824 if (s != 0) { 825 ti->c_ispeed = ti->c_ospeed = s; 826 to->c_ispeed = to->c_ospeed = s; 827 } 828 829 ti->c_cflag |= CLOCAL; 830 to->c_cflag |= CLOCAL; 831 } 832 833 /* 834 * Standard device routine implementations, mostly meant for 835 * pseudo-terminal device drivers. When a driver creates a new terminal 836 * device class, missing routines are patched. 837 */ 838 839 static int 840 ttydevsw_defopen(struct tty *tp) 841 { 842 843 return (0); 844 } 845 846 static void 847 ttydevsw_defclose(struct tty *tp) 848 { 849 } 850 851 static void 852 ttydevsw_defoutwakeup(struct tty *tp) 853 { 854 855 panic("Terminal device has output, while not implemented"); 856 } 857 858 static void 859 ttydevsw_definwakeup(struct tty *tp) 860 { 861 } 862 863 static int 864 ttydevsw_defioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td) 865 { 866 867 return (ENOIOCTL); 868 } 869 870 static int 871 ttydevsw_defparam(struct tty *tp, struct termios *t) 872 { 873 874 /* Use a fake baud rate, we're not a real device. */ 875 t->c_ispeed = t->c_ospeed = TTYDEF_SPEED; 876 877 return (0); 878 } 879 880 static int 881 ttydevsw_defmodem(struct tty *tp, int sigon, int sigoff) 882 { 883 884 /* Simulate a carrier to make the TTY layer happy. */ 885 return (SER_DCD); 886 } 887 888 static int 889 ttydevsw_defmmap(struct tty *tp, vm_offset_t offset, vm_paddr_t *paddr, 890 int nprot) 891 { 892 893 return (-1); 894 } 895 896 static void 897 ttydevsw_defpktnotify(struct tty *tp, char event) 898 { 899 } 900 901 static void 902 ttydevsw_deffree(void *softc) 903 { 904 905 panic("Terminal device freed without a free-handler"); 906 } 907 908 /* 909 * TTY allocation and deallocation. TTY devices can be deallocated when 910 * the driver doesn't use it anymore, when the TTY isn't a session's 911 * controlling TTY and when the device node isn't opened through devfs. 912 */ 913 914 struct tty * 915 tty_alloc(struct ttydevsw *tsw, void *sc) 916 { 917 918 return (tty_alloc_mutex(tsw, sc, NULL)); 919 } 920 921 struct tty * 922 tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex) 923 { 924 struct tty *tp; 925 926 /* Make sure the driver defines all routines. */ 927 #define PATCH_FUNC(x) do { \ 928 if (tsw->tsw_ ## x == NULL) \ 929 tsw->tsw_ ## x = ttydevsw_def ## x; \ 930 } while (0) 931 PATCH_FUNC(open); 932 PATCH_FUNC(close); 933 PATCH_FUNC(outwakeup); 934 PATCH_FUNC(inwakeup); 935 PATCH_FUNC(ioctl); 936 PATCH_FUNC(param); 937 PATCH_FUNC(modem); 938 PATCH_FUNC(mmap); 939 PATCH_FUNC(pktnotify); 940 PATCH_FUNC(free); 941 #undef PATCH_FUNC 942 943 tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO); 944 tp->t_devsw = tsw; 945 tp->t_devswsoftc = sc; 946 tp->t_flags = tsw->tsw_flags; 947 948 tty_init_termios(tp); 949 950 cv_init(&tp->t_inwait, "ttyin"); 951 cv_init(&tp->t_outwait, "ttyout"); 952 cv_init(&tp->t_outserwait, "ttyosr"); 953 cv_init(&tp->t_bgwait, "ttybg"); 954 cv_init(&tp->t_dcdwait, "ttydcd"); 955 956 /* Allow drivers to use a custom mutex to lock the TTY. */ 957 if (mutex != NULL) { 958 tp->t_mtx = mutex; 959 } else { 960 tp->t_mtx = &tp->t_mtxobj; 961 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF); 962 } 963 964 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx); 965 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx); 966 967 sx_xlock(&tty_list_sx); 968 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 969 tty_list_count++; 970 sx_xunlock(&tty_list_sx); 971 972 return (tp); 973 } 974 975 static void 976 tty_dealloc(void *arg) 977 { 978 struct tty *tp = arg; 979 980 sx_xlock(&tty_list_sx); 981 TAILQ_REMOVE(&tty_list, tp, t_list); 982 tty_list_count--; 983 sx_xunlock(&tty_list_sx); 984 985 /* Make sure we haven't leaked buffers. */ 986 MPASS(ttyinq_getsize(&tp->t_inq) == 0); 987 MPASS(ttyoutq_getsize(&tp->t_outq) == 0); 988 989 knlist_destroy(&tp->t_inpoll.si_note); 990 knlist_destroy(&tp->t_outpoll.si_note); 991 992 cv_destroy(&tp->t_inwait); 993 cv_destroy(&tp->t_outwait); 994 cv_destroy(&tp->t_bgwait); 995 cv_destroy(&tp->t_dcdwait); 996 cv_destroy(&tp->t_outserwait); 997 998 if (tp->t_mtx == &tp->t_mtxobj) 999 mtx_destroy(&tp->t_mtxobj); 1000 ttydevsw_free(tp); 1001 free(tp, M_TTY); 1002 } 1003 1004 static void 1005 tty_rel_free(struct tty *tp) 1006 { 1007 struct cdev *dev; 1008 1009 tty_lock_assert(tp, MA_OWNED); 1010 1011 #define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE) 1012 if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) { 1013 /* TTY is still in use. */ 1014 tty_unlock(tp); 1015 return; 1016 } 1017 1018 /* TTY can be deallocated. */ 1019 dev = tp->t_dev; 1020 tp->t_dev = NULL; 1021 tty_unlock(tp); 1022 1023 destroy_dev_sched_cb(dev, tty_dealloc, tp); 1024 } 1025 1026 void 1027 tty_rel_pgrp(struct tty *tp, struct pgrp *pg) 1028 { 1029 MPASS(tp->t_sessioncnt > 0); 1030 tty_lock_assert(tp, MA_OWNED); 1031 1032 if (tp->t_pgrp == pg) 1033 tp->t_pgrp = NULL; 1034 1035 tty_unlock(tp); 1036 } 1037 1038 void 1039 tty_rel_sess(struct tty *tp, struct session *sess) 1040 { 1041 MPASS(tp->t_sessioncnt > 0); 1042 1043 /* Current session has left. */ 1044 if (tp->t_session == sess) { 1045 tp->t_session = NULL; 1046 MPASS(tp->t_pgrp == NULL); 1047 } 1048 tp->t_sessioncnt--; 1049 tty_rel_free(tp); 1050 } 1051 1052 void 1053 tty_rel_gone(struct tty *tp) 1054 { 1055 MPASS(!tty_gone(tp)); 1056 1057 /* Simulate carrier removal. */ 1058 ttydisc_modem(tp, 0); 1059 1060 /* Wake up all blocked threads. */ 1061 tty_wakeup(tp, FREAD|FWRITE); 1062 cv_broadcast(&tp->t_bgwait); 1063 cv_broadcast(&tp->t_dcdwait); 1064 1065 tp->t_flags |= TF_GONE; 1066 tty_rel_free(tp); 1067 } 1068 1069 /* 1070 * Exposing information about current TTY's through sysctl 1071 */ 1072 1073 static void 1074 tty_to_xtty(struct tty *tp, struct xtty *xt) 1075 { 1076 tty_lock_assert(tp, MA_OWNED); 1077 1078 xt->xt_size = sizeof(struct xtty); 1079 xt->xt_insize = ttyinq_getsize(&tp->t_inq); 1080 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq); 1081 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq); 1082 xt->xt_inlow = tp->t_inlow; 1083 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq); 1084 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq); 1085 xt->xt_outlow = tp->t_outlow; 1086 xt->xt_column = tp->t_column; 1087 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1088 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0; 1089 xt->xt_flags = tp->t_flags; 1090 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV; 1091 } 1092 1093 static int 1094 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 1095 { 1096 unsigned long lsize; 1097 struct xtty *xtlist, *xt; 1098 struct tty *tp; 1099 int error; 1100 1101 sx_slock(&tty_list_sx); 1102 lsize = tty_list_count * sizeof(struct xtty); 1103 if (lsize == 0) { 1104 sx_sunlock(&tty_list_sx); 1105 return (0); 1106 } 1107 1108 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK); 1109 1110 TAILQ_FOREACH(tp, &tty_list, t_list) { 1111 tty_lock(tp); 1112 tty_to_xtty(tp, xt); 1113 tty_unlock(tp); 1114 xt++; 1115 } 1116 sx_sunlock(&tty_list_sx); 1117 1118 error = SYSCTL_OUT(req, xtlist, lsize); 1119 free(xtlist, M_TTY); 1120 return (error); 1121 } 1122 1123 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 1124 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs"); 1125 1126 /* 1127 * Device node creation. Device has been set up, now we can expose it to 1128 * the user. 1129 */ 1130 1131 void 1132 tty_makedev(struct tty *tp, struct ucred *cred, const char *fmt, ...) 1133 { 1134 va_list ap; 1135 struct cdev *dev; 1136 const char *prefix = "tty"; 1137 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */ 1138 uid_t uid; 1139 gid_t gid; 1140 mode_t mode; 1141 1142 /* Remove "tty" prefix from devices like PTY's. */ 1143 if (tp->t_flags & TF_NOPREFIX) 1144 prefix = ""; 1145 1146 va_start(ap, fmt); 1147 vsnrprintf(name, sizeof name, 32, fmt, ap); 1148 va_end(ap); 1149 1150 if (cred == NULL) { 1151 /* System device. */ 1152 uid = UID_ROOT; 1153 gid = GID_WHEEL; 1154 mode = S_IRUSR|S_IWUSR; 1155 } else { 1156 /* User device. */ 1157 uid = cred->cr_ruid; 1158 gid = GID_TTY; 1159 mode = S_IRUSR|S_IWUSR|S_IWGRP; 1160 } 1161 1162 /* Master call-in device. */ 1163 dev = make_dev_cred(&ttydev_cdevsw, 0, cred, 1164 uid, gid, mode, "%s%s", prefix, name); 1165 dev->si_drv1 = tp; 1166 tp->t_dev = dev; 1167 1168 /* Slave call-in devices. */ 1169 if (tp->t_flags & TF_INITLOCK) { 1170 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1171 uid, gid, mode, "%s%s.init", prefix, name); 1172 dev_depends(tp->t_dev, dev); 1173 dev->si_drv1 = tp; 1174 dev->si_drv2 = &tp->t_termios_init_in; 1175 1176 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1177 uid, gid, mode, "%s%s.lock", prefix, name); 1178 dev_depends(tp->t_dev, dev); 1179 dev->si_drv1 = tp; 1180 dev->si_drv2 = &tp->t_termios_lock_in; 1181 } 1182 1183 /* Call-out devices. */ 1184 if (tp->t_flags & TF_CALLOUT) { 1185 dev = make_dev_cred(&ttydev_cdevsw, 0, cred, 1186 UID_UUCP, GID_DIALER, 0660, "cua%s", name); 1187 dev_depends(tp->t_dev, dev); 1188 dev->si_drv1 = tp; 1189 1190 /* Slave call-out devices. */ 1191 if (tp->t_flags & TF_INITLOCK) { 1192 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1193 UID_UUCP, GID_DIALER, 0660, "cua%s.init", name); 1194 dev_depends(tp->t_dev, dev); 1195 dev->si_drv1 = tp; 1196 dev->si_drv2 = &tp->t_termios_init_out; 1197 1198 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1199 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", name); 1200 dev_depends(tp->t_dev, dev); 1201 dev->si_drv1 = tp; 1202 dev->si_drv2 = &tp->t_termios_lock_out; 1203 } 1204 } 1205 } 1206 1207 /* 1208 * Signalling processes. 1209 */ 1210 1211 void 1212 tty_signal_sessleader(struct tty *tp, int sig) 1213 { 1214 struct proc *p; 1215 1216 tty_lock_assert(tp, MA_OWNED); 1217 MPASS(sig >= 1 && sig < NSIG); 1218 1219 /* Make signals start output again. */ 1220 tp->t_flags &= ~TF_STOPPED; 1221 1222 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) { 1223 p = tp->t_session->s_leader; 1224 PROC_LOCK(p); 1225 psignal(p, sig); 1226 PROC_UNLOCK(p); 1227 } 1228 } 1229 1230 void 1231 tty_signal_pgrp(struct tty *tp, int sig) 1232 { 1233 ksiginfo_t ksi; 1234 1235 tty_lock_assert(tp, MA_OWNED); 1236 MPASS(sig >= 1 && sig < NSIG); 1237 1238 /* Make signals start output again. */ 1239 tp->t_flags &= ~TF_STOPPED; 1240 1241 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO)) 1242 tty_info(tp); 1243 if (tp->t_pgrp != NULL) { 1244 ksiginfo_init(&ksi); 1245 ksi.ksi_signo = sig; 1246 ksi.ksi_code = SI_KERNEL; 1247 PGRP_LOCK(tp->t_pgrp); 1248 pgsignal(tp->t_pgrp, sig, 1, &ksi); 1249 PGRP_UNLOCK(tp->t_pgrp); 1250 } 1251 } 1252 1253 void 1254 tty_wakeup(struct tty *tp, int flags) 1255 { 1256 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL) 1257 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 1258 1259 if (flags & FWRITE) { 1260 cv_broadcast(&tp->t_outwait); 1261 selwakeup(&tp->t_outpoll); 1262 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0); 1263 } 1264 if (flags & FREAD) { 1265 cv_broadcast(&tp->t_inwait); 1266 selwakeup(&tp->t_inpoll); 1267 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0); 1268 } 1269 } 1270 1271 int 1272 tty_wait(struct tty *tp, struct cv *cv) 1273 { 1274 int error; 1275 int revokecnt = tp->t_revokecnt; 1276 1277 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1278 MPASS(!tty_gone(tp)); 1279 1280 error = cv_wait_sig(cv, tp->t_mtx); 1281 1282 /* Restart the system call when we may have been revoked. */ 1283 if (tp->t_revokecnt != revokecnt) 1284 return (ERESTART); 1285 1286 /* Bail out when the device slipped away. */ 1287 if (tty_gone(tp)) 1288 return (ENXIO); 1289 1290 return (error); 1291 } 1292 1293 int 1294 tty_timedwait(struct tty *tp, struct cv *cv, int hz) 1295 { 1296 int error; 1297 int revokecnt = tp->t_revokecnt; 1298 1299 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1300 MPASS(!tty_gone(tp)); 1301 1302 error = cv_timedwait_sig(cv, tp->t_mtx, hz); 1303 1304 /* Restart the system call when we may have been revoked. */ 1305 if (tp->t_revokecnt != revokecnt) 1306 return (ERESTART); 1307 1308 /* Bail out when the device slipped away. */ 1309 if (tty_gone(tp)) 1310 return (ENXIO); 1311 1312 return (error); 1313 } 1314 1315 void 1316 tty_flush(struct tty *tp, int flags) 1317 { 1318 if (flags & FWRITE) { 1319 tp->t_flags &= ~TF_HIWAT_OUT; 1320 ttyoutq_flush(&tp->t_outq); 1321 tty_wakeup(tp, FWRITE); 1322 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE); 1323 } 1324 if (flags & FREAD) { 1325 tty_hiwat_in_unblock(tp); 1326 ttyinq_flush(&tp->t_inq); 1327 ttydevsw_inwakeup(tp); 1328 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD); 1329 } 1330 } 1331 1332 static int 1333 tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, struct thread *td) 1334 { 1335 int error; 1336 1337 switch (cmd) { 1338 /* 1339 * Modem commands. 1340 * The SER_* and TIOCM_* flags are the same, but one bit 1341 * shifted. I don't know why. 1342 */ 1343 case TIOCSDTR: 1344 ttydevsw_modem(tp, SER_DTR, 0); 1345 return (0); 1346 case TIOCCDTR: 1347 ttydevsw_modem(tp, 0, SER_DTR); 1348 return (0); 1349 case TIOCMSET: { 1350 int bits = *(int *)data; 1351 ttydevsw_modem(tp, 1352 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 1353 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1354 return (0); 1355 } 1356 case TIOCMBIS: { 1357 int bits = *(int *)data; 1358 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0); 1359 return (0); 1360 } 1361 case TIOCMBIC: { 1362 int bits = *(int *)data; 1363 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1364 return (0); 1365 } 1366 case TIOCMGET: 1367 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1); 1368 return (0); 1369 1370 case FIOASYNC: 1371 if (*(int *)data) 1372 tp->t_flags |= TF_ASYNC; 1373 else 1374 tp->t_flags &= ~TF_ASYNC; 1375 return (0); 1376 case FIONBIO: 1377 /* This device supports non-blocking operation. */ 1378 return (0); 1379 case FIONREAD: 1380 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq); 1381 return (0); 1382 case FIONWRITE: 1383 case TIOCOUTQ: 1384 *(int *)data = ttyoutq_bytesused(&tp->t_outq); 1385 return (0); 1386 case FIOSETOWN: 1387 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1388 /* Not allowed to set ownership. */ 1389 return (ENOTTY); 1390 1391 /* Temporarily unlock the TTY to set ownership. */ 1392 tty_unlock(tp); 1393 error = fsetown(*(int *)data, &tp->t_sigio); 1394 tty_lock(tp); 1395 return (error); 1396 case FIOGETOWN: 1397 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1398 /* Not allowed to set ownership. */ 1399 return (ENOTTY); 1400 1401 /* Get ownership. */ 1402 *(int *)data = fgetown(&tp->t_sigio); 1403 return (0); 1404 case TIOCGETA: 1405 /* Obtain terminal flags through tcgetattr(). */ 1406 *(struct termios*)data = tp->t_termios; 1407 return (0); 1408 case TIOCSETA: 1409 case TIOCSETAW: 1410 case TIOCSETAF: { 1411 struct termios *t = data; 1412 1413 /* 1414 * Who makes up these funny rules? According to POSIX, 1415 * input baud rate is set equal to the output baud rate 1416 * when zero. 1417 */ 1418 if (t->c_ispeed == 0) 1419 t->c_ispeed = t->c_ospeed; 1420 1421 /* Discard any unsupported bits. */ 1422 t->c_iflag &= TTYSUP_IFLAG; 1423 t->c_oflag &= TTYSUP_OFLAG; 1424 t->c_lflag &= TTYSUP_LFLAG; 1425 t->c_cflag &= TTYSUP_CFLAG; 1426 1427 /* Set terminal flags through tcsetattr(). */ 1428 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1429 error = tty_drain(tp); 1430 if (error) 1431 return (error); 1432 if (cmd == TIOCSETAF) 1433 tty_flush(tp, FREAD); 1434 } 1435 1436 /* 1437 * Only call param() when the flags really change. 1438 */ 1439 if ((t->c_cflag & CIGNORE) == 0 && 1440 (tp->t_termios.c_cflag != t->c_cflag || 1441 tp->t_termios.c_ispeed != t->c_ispeed || 1442 tp->t_termios.c_ospeed != t->c_ospeed)) { 1443 error = ttydevsw_param(tp, t); 1444 if (error) 1445 return (error); 1446 1447 /* XXX: CLOCAL? */ 1448 1449 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE; 1450 tp->t_termios.c_ispeed = t->c_ispeed; 1451 tp->t_termios.c_ospeed = t->c_ospeed; 1452 1453 /* Baud rate has changed - update watermarks. */ 1454 tty_watermarks(tp); 1455 } 1456 1457 /* Copy new non-device driver parameters. */ 1458 tp->t_termios.c_iflag = t->c_iflag; 1459 tp->t_termios.c_oflag = t->c_oflag; 1460 tp->t_termios.c_lflag = t->c_lflag; 1461 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc); 1462 1463 ttydisc_optimize(tp); 1464 1465 if ((t->c_lflag & ICANON) == 0) { 1466 /* 1467 * When in non-canonical mode, wake up all 1468 * readers. Canonicalize any partial input. VMIN 1469 * and VTIME could also be adjusted. 1470 */ 1471 ttyinq_canonicalize(&tp->t_inq); 1472 tty_wakeup(tp, FREAD); 1473 } 1474 1475 /* 1476 * For packet mode: notify the PTY consumer that VSTOP 1477 * and VSTART may have been changed. 1478 */ 1479 if (tp->t_termios.c_iflag & IXON && 1480 tp->t_termios.c_cc[VSTOP] == CTRL('S') && 1481 tp->t_termios.c_cc[VSTART] == CTRL('Q')) 1482 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP); 1483 else 1484 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP); 1485 return (0); 1486 } 1487 case TIOCGETD: 1488 /* For compatibility - we only support TTYDISC. */ 1489 *(int *)data = TTYDISC; 1490 return (0); 1491 case TIOCGPGRP: 1492 if (!tty_is_ctty(tp, td->td_proc)) 1493 return (ENOTTY); 1494 1495 if (tp->t_pgrp != NULL) 1496 *(int *)data = tp->t_pgrp->pg_id; 1497 else 1498 *(int *)data = NO_PID; 1499 return (0); 1500 case TIOCGSID: 1501 if (!tty_is_ctty(tp, td->td_proc)) 1502 return (ENOTTY); 1503 1504 MPASS(tp->t_session); 1505 *(int *)data = tp->t_session->s_sid; 1506 return (0); 1507 case TIOCSCTTY: { 1508 struct proc *p = td->td_proc; 1509 1510 /* XXX: This looks awful. */ 1511 tty_unlock(tp); 1512 sx_xlock(&proctree_lock); 1513 tty_lock(tp); 1514 1515 if (!SESS_LEADER(p)) { 1516 /* Only the session leader may do this. */ 1517 sx_xunlock(&proctree_lock); 1518 return (EPERM); 1519 } 1520 1521 if (tp->t_session != NULL && tp->t_session == p->p_session) { 1522 /* This is already our controlling TTY. */ 1523 sx_xunlock(&proctree_lock); 1524 return (0); 1525 } 1526 1527 if (p->p_session->s_ttyp != NULL || 1528 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL && 1529 tp->t_session->s_ttyvp->v_type != VBAD)) { 1530 /* 1531 * There is already a relation between a TTY and 1532 * a session, or the caller is not the session 1533 * leader. 1534 * 1535 * Allow the TTY to be stolen when the vnode is 1536 * invalid, but the reference to the TTY is 1537 * still active. This allows immediate reuse of 1538 * TTYs of which the session leader has been 1539 * killed or the TTY revoked. 1540 */ 1541 sx_xunlock(&proctree_lock); 1542 return (EPERM); 1543 } 1544 1545 /* Connect the session to the TTY. */ 1546 tp->t_session = p->p_session; 1547 tp->t_session->s_ttyp = tp; 1548 tp->t_sessioncnt++; 1549 sx_xunlock(&proctree_lock); 1550 1551 /* Assign foreground process group. */ 1552 tp->t_pgrp = p->p_pgrp; 1553 PROC_LOCK(p); 1554 p->p_flag |= P_CONTROLT; 1555 PROC_UNLOCK(p); 1556 1557 return (0); 1558 } 1559 case TIOCSPGRP: { 1560 struct pgrp *pg; 1561 1562 /* 1563 * XXX: Temporarily unlock the TTY to locate the process 1564 * group. This code would be lot nicer if we would ever 1565 * decompose proctree_lock. 1566 */ 1567 tty_unlock(tp); 1568 sx_slock(&proctree_lock); 1569 pg = pgfind(*(int *)data); 1570 if (pg != NULL) 1571 PGRP_UNLOCK(pg); 1572 if (pg == NULL || pg->pg_session != td->td_proc->p_session) { 1573 sx_sunlock(&proctree_lock); 1574 tty_lock(tp); 1575 return (EPERM); 1576 } 1577 tty_lock(tp); 1578 1579 /* 1580 * Determine if this TTY is the controlling TTY after 1581 * relocking the TTY. 1582 */ 1583 if (!tty_is_ctty(tp, td->td_proc)) { 1584 sx_sunlock(&proctree_lock); 1585 return (ENOTTY); 1586 } 1587 tp->t_pgrp = pg; 1588 sx_sunlock(&proctree_lock); 1589 1590 /* Wake up the background process groups. */ 1591 cv_broadcast(&tp->t_bgwait); 1592 return (0); 1593 } 1594 case TIOCFLUSH: { 1595 int flags = *(int *)data; 1596 1597 if (flags == 0) 1598 flags = (FREAD|FWRITE); 1599 else 1600 flags &= (FREAD|FWRITE); 1601 tty_flush(tp, flags); 1602 return (0); 1603 } 1604 case TIOCDRAIN: 1605 /* Drain TTY output. */ 1606 return tty_drain(tp); 1607 case TIOCCONS: 1608 /* Set terminal as console TTY. */ 1609 if (*(int *)data) { 1610 error = priv_check(td, PRIV_TTY_CONSOLE); 1611 if (error) 1612 return (error); 1613 1614 /* 1615 * XXX: constty should really need to be locked! 1616 * XXX: allow disconnected constty's to be stolen! 1617 */ 1618 1619 if (constty == tp) 1620 return (0); 1621 if (constty != NULL) 1622 return (EBUSY); 1623 1624 tty_unlock(tp); 1625 constty_set(tp); 1626 tty_lock(tp); 1627 } else if (constty == tp) { 1628 constty_clear(); 1629 } 1630 return (0); 1631 case TIOCGWINSZ: 1632 /* Obtain window size. */ 1633 *(struct winsize*)data = tp->t_winsize; 1634 return (0); 1635 case TIOCSWINSZ: 1636 /* Set window size. */ 1637 if (bcmp(&tp->t_winsize, data, sizeof(struct winsize)) == 0) 1638 return (0); 1639 tp->t_winsize = *(struct winsize*)data; 1640 tty_signal_pgrp(tp, SIGWINCH); 1641 return (0); 1642 case TIOCEXCL: 1643 tp->t_flags |= TF_EXCLUDE; 1644 return (0); 1645 case TIOCNXCL: 1646 tp->t_flags &= ~TF_EXCLUDE; 1647 return (0); 1648 case TIOCSTOP: 1649 tp->t_flags |= TF_STOPPED; 1650 ttydevsw_pktnotify(tp, TIOCPKT_STOP); 1651 return (0); 1652 case TIOCSTART: 1653 tp->t_flags &= ~TF_STOPPED; 1654 ttydevsw_outwakeup(tp); 1655 ttydevsw_pktnotify(tp, TIOCPKT_START); 1656 return (0); 1657 case TIOCSTAT: 1658 tty_info(tp); 1659 return (0); 1660 } 1661 1662 #ifdef COMPAT_43TTY 1663 return tty_ioctl_compat(tp, cmd, data, td); 1664 #else /* !COMPAT_43TTY */ 1665 return (ENOIOCTL); 1666 #endif /* COMPAT_43TTY */ 1667 } 1668 1669 int 1670 tty_ioctl(struct tty *tp, u_long cmd, void *data, struct thread *td) 1671 { 1672 int error; 1673 1674 tty_lock_assert(tp, MA_OWNED); 1675 1676 if (tty_gone(tp)) 1677 return (ENXIO); 1678 1679 error = ttydevsw_ioctl(tp, cmd, data, td); 1680 if (error == ENOIOCTL) 1681 error = tty_generic_ioctl(tp, cmd, data, td); 1682 1683 return (error); 1684 } 1685 1686 dev_t 1687 tty_udev(struct tty *tp) 1688 { 1689 if (tp->t_dev) 1690 return dev2udev(tp->t_dev); 1691 else 1692 return NODEV; 1693 } 1694 1695 int 1696 tty_checkoutq(struct tty *tp) 1697 { 1698 1699 /* 256 bytes should be enough to print a log message. */ 1700 return (ttyoutq_bytesleft(&tp->t_outq) >= 256); 1701 } 1702 1703 void 1704 tty_hiwat_in_block(struct tty *tp) 1705 { 1706 1707 if ((tp->t_flags & TF_HIWAT_IN) == 0 && 1708 tp->t_termios.c_iflag & IXOFF && 1709 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) { 1710 /* 1711 * Input flow control. Only enter the high watermark when we 1712 * can successfully store the VSTOP character. 1713 */ 1714 if (ttyoutq_write_nofrag(&tp->t_outq, 1715 &tp->t_termios.c_cc[VSTOP], 1) == 0) 1716 tp->t_flags |= TF_HIWAT_IN; 1717 } else { 1718 /* No input flow control. */ 1719 tp->t_flags |= TF_HIWAT_IN; 1720 } 1721 } 1722 1723 void 1724 tty_hiwat_in_unblock(struct tty *tp) 1725 { 1726 1727 if (tp->t_flags & TF_HIWAT_IN && 1728 tp->t_termios.c_iflag & IXOFF && 1729 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) { 1730 /* 1731 * Input flow control. Only leave the high watermark when we 1732 * can successfully store the VSTART character. 1733 */ 1734 if (ttyoutq_write_nofrag(&tp->t_outq, 1735 &tp->t_termios.c_cc[VSTART], 1) == 0) 1736 tp->t_flags &= ~TF_HIWAT_IN; 1737 } else { 1738 /* No input flow control. */ 1739 tp->t_flags &= ~TF_HIWAT_IN; 1740 } 1741 1742 if (!tty_gone(tp)) 1743 ttydevsw_inwakeup(tp); 1744 } 1745 1746 /* 1747 * TTY hooks interface. 1748 */ 1749 1750 static int 1751 ttyhook_defrint(struct tty *tp, char c, int flags) 1752 { 1753 1754 if (ttyhook_rint_bypass(tp, &c, 1) != 1) 1755 return (-1); 1756 1757 return (0); 1758 } 1759 1760 int 1761 ttyhook_register(struct tty **rtp, struct proc *p, int fd, 1762 struct ttyhook *th, void *softc) 1763 { 1764 struct tty *tp; 1765 struct file *fp; 1766 struct cdev *dev; 1767 struct cdevsw *cdp; 1768 struct filedesc *fdp; 1769 int error; 1770 1771 /* Validate the file descriptor. */ 1772 if ((fdp = p->p_fd) == NULL) 1773 return (EBADF); 1774 1775 fp = fget_unlocked(fdp, fd); 1776 if (fp == NULL) 1777 return (EBADF); 1778 if (fp->f_ops == &badfileops) { 1779 error = EBADF; 1780 goto done1; 1781 } 1782 1783 /* 1784 * Make sure the vnode is bound to a character device. 1785 * Unlocked check for the vnode type is ok there, because we 1786 * only shall prevent calling devvn_refthread on the file that 1787 * never has been opened over a character device. 1788 */ 1789 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) { 1790 error = EINVAL; 1791 goto done1; 1792 } 1793 1794 /* Make sure it is a TTY. */ 1795 cdp = devvn_refthread(fp->f_vnode, &dev); 1796 if (cdp == NULL) { 1797 error = ENXIO; 1798 goto done1; 1799 } 1800 if (dev != fp->f_data) { 1801 error = ENXIO; 1802 goto done2; 1803 } 1804 if (cdp != &ttydev_cdevsw) { 1805 error = ENOTTY; 1806 goto done2; 1807 } 1808 tp = dev->si_drv1; 1809 1810 /* Try to attach the hook to the TTY. */ 1811 error = EBUSY; 1812 tty_lock(tp); 1813 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0)); 1814 if (tp->t_flags & TF_HOOK) 1815 goto done3; 1816 1817 tp->t_flags |= TF_HOOK; 1818 tp->t_hook = th; 1819 tp->t_hooksoftc = softc; 1820 *rtp = tp; 1821 error = 0; 1822 1823 /* Maybe we can switch into bypass mode now. */ 1824 ttydisc_optimize(tp); 1825 1826 /* Silently convert rint() calls to rint_bypass() when possible. */ 1827 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass)) 1828 th->th_rint = ttyhook_defrint; 1829 1830 done3: tty_unlock(tp); 1831 done2: dev_relthread(dev); 1832 done1: fdrop(fp, curthread); 1833 return (error); 1834 } 1835 1836 void 1837 ttyhook_unregister(struct tty *tp) 1838 { 1839 1840 tty_lock_assert(tp, MA_OWNED); 1841 MPASS(tp->t_flags & TF_HOOK); 1842 1843 /* Disconnect the hook. */ 1844 tp->t_flags &= ~TF_HOOK; 1845 tp->t_hook = NULL; 1846 1847 /* Maybe we need to leave bypass mode. */ 1848 ttydisc_optimize(tp); 1849 1850 /* Maybe deallocate the TTY as well. */ 1851 tty_rel_free(tp); 1852 } 1853 1854 /* 1855 * /dev/console handling. 1856 */ 1857 1858 static int 1859 ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 1860 { 1861 struct tty *tp; 1862 1863 /* System has no console device. */ 1864 if (dev_console_filename == NULL) 1865 return (ENXIO); 1866 1867 /* Look up corresponding TTY by device name. */ 1868 sx_slock(&tty_list_sx); 1869 TAILQ_FOREACH(tp, &tty_list, t_list) { 1870 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) { 1871 dev_console->si_drv1 = tp; 1872 break; 1873 } 1874 } 1875 sx_sunlock(&tty_list_sx); 1876 1877 /* System console has no TTY associated. */ 1878 if (dev_console->si_drv1 == NULL) 1879 return (ENXIO); 1880 1881 return (ttydev_open(dev, oflags, devtype, td)); 1882 } 1883 1884 static int 1885 ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag) 1886 { 1887 1888 log_console(uio); 1889 1890 return (ttydev_write(dev, uio, ioflag)); 1891 } 1892 1893 /* 1894 * /dev/console is a little different than normal TTY's. When opened, 1895 * it determines which TTY to use. When data gets written to it, it 1896 * will be logged in the kernel message buffer. 1897 */ 1898 static struct cdevsw ttyconsdev_cdevsw = { 1899 .d_version = D_VERSION, 1900 .d_open = ttyconsdev_open, 1901 .d_close = ttydev_close, 1902 .d_read = ttydev_read, 1903 .d_write = ttyconsdev_write, 1904 .d_ioctl = ttydev_ioctl, 1905 .d_kqfilter = ttydev_kqfilter, 1906 .d_poll = ttydev_poll, 1907 .d_mmap = ttydev_mmap, 1908 .d_name = "ttyconsdev", 1909 .d_flags = D_TTY, 1910 }; 1911 1912 static void 1913 ttyconsdev_init(void *unused) 1914 { 1915 1916 dev_console = make_dev(&ttyconsdev_cdevsw, 0, UID_ROOT, GID_WHEEL, 1917 0600, "console"); 1918 } 1919 1920 SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL); 1921 1922 void 1923 ttyconsdev_select(const char *name) 1924 { 1925 1926 dev_console_filename = name; 1927 } 1928 1929 /* 1930 * Debugging routines. 1931 */ 1932 1933 #include "opt_ddb.h" 1934 #ifdef DDB 1935 #include <ddb/ddb.h> 1936 #include <ddb/db_sym.h> 1937 1938 static struct { 1939 int flag; 1940 char val; 1941 } ttystates[] = { 1942 #if 0 1943 { TF_NOPREFIX, 'N' }, 1944 #endif 1945 { TF_INITLOCK, 'I' }, 1946 { TF_CALLOUT, 'C' }, 1947 1948 /* Keep these together -> 'Oi' and 'Oo'. */ 1949 { TF_OPENED, 'O' }, 1950 { TF_OPENED_IN, 'i' }, 1951 { TF_OPENED_OUT, 'o' }, 1952 { TF_OPENED_CONS, 'c' }, 1953 1954 { TF_GONE, 'G' }, 1955 { TF_OPENCLOSE, 'B' }, 1956 { TF_ASYNC, 'Y' }, 1957 { TF_LITERAL, 'L' }, 1958 1959 /* Keep these together -> 'Hi' and 'Ho'. */ 1960 { TF_HIWAT, 'H' }, 1961 { TF_HIWAT_IN, 'i' }, 1962 { TF_HIWAT_OUT, 'o' }, 1963 1964 { TF_STOPPED, 'S' }, 1965 { TF_EXCLUDE, 'X' }, 1966 { TF_BYPASS, 'l' }, 1967 { TF_ZOMBIE, 'Z' }, 1968 { TF_HOOK, 's' }, 1969 1970 /* Keep these together -> 'bi' and 'bo'. */ 1971 { TF_BUSY, 'b' }, 1972 { TF_BUSY_IN, 'i' }, 1973 { TF_BUSY_OUT, 'o' }, 1974 1975 { 0, '\0'}, 1976 }; 1977 1978 #define TTY_FLAG_BITS \ 1979 "\20\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \ 1980 "\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \ 1981 "\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK" 1982 1983 #define DB_PRINTSYM(name, addr) \ 1984 db_printf("%s " #name ": ", sep); \ 1985 db_printsym((db_addr_t) addr, DB_STGY_ANY); \ 1986 db_printf("\n"); 1987 1988 static void 1989 _db_show_devsw(const char *sep, const struct ttydevsw *tsw) 1990 { 1991 db_printf("%sdevsw: ", sep); 1992 db_printsym((db_addr_t)tsw, DB_STGY_ANY); 1993 db_printf(" (%p)\n", tsw); 1994 DB_PRINTSYM(open, tsw->tsw_open); 1995 DB_PRINTSYM(close, tsw->tsw_close); 1996 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup); 1997 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup); 1998 DB_PRINTSYM(ioctl, tsw->tsw_ioctl); 1999 DB_PRINTSYM(param, tsw->tsw_param); 2000 DB_PRINTSYM(modem, tsw->tsw_modem); 2001 DB_PRINTSYM(mmap, tsw->tsw_mmap); 2002 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify); 2003 DB_PRINTSYM(free, tsw->tsw_free); 2004 } 2005 static void 2006 _db_show_hooks(const char *sep, const struct ttyhook *th) 2007 { 2008 db_printf("%shook: ", sep); 2009 db_printsym((db_addr_t)th, DB_STGY_ANY); 2010 db_printf(" (%p)\n", th); 2011 if (th == NULL) 2012 return; 2013 DB_PRINTSYM(rint, th->th_rint); 2014 DB_PRINTSYM(rint_bypass, th->th_rint_bypass); 2015 DB_PRINTSYM(rint_done, th->th_rint_done); 2016 DB_PRINTSYM(rint_poll, th->th_rint_poll); 2017 DB_PRINTSYM(getc_inject, th->th_getc_inject); 2018 DB_PRINTSYM(getc_capture, th->th_getc_capture); 2019 DB_PRINTSYM(getc_poll, th->th_getc_poll); 2020 DB_PRINTSYM(close, th->th_close); 2021 } 2022 2023 static void 2024 _db_show_termios(const char *name, const struct termios *t) 2025 { 2026 2027 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x " 2028 "lflag 0x%x ispeed %u ospeed %u\n", name, 2029 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag, 2030 t->c_ispeed, t->c_ospeed); 2031 } 2032 2033 /* DDB command to show TTY statistics. */ 2034 DB_SHOW_COMMAND(tty, db_show_tty) 2035 { 2036 struct tty *tp; 2037 2038 if (!have_addr) { 2039 db_printf("usage: show tty <addr>\n"); 2040 return; 2041 } 2042 tp = (struct tty *)addr; 2043 2044 db_printf("0x%p: %s\n", tp, tty_devname(tp)); 2045 db_printf("\tmtx: %p\n", tp->t_mtx); 2046 db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS); 2047 db_printf("\trevokecnt: %u\n", tp->t_revokecnt); 2048 2049 /* Buffering mechanisms. */ 2050 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u " 2051 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin, 2052 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end, 2053 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota); 2054 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n", 2055 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end, 2056 tp->t_outq.to_nblocks, tp->t_outq.to_quota); 2057 db_printf("\tinlow: %zu\n", tp->t_inlow); 2058 db_printf("\toutlow: %zu\n", tp->t_outlow); 2059 _db_show_termios("\ttermios", &tp->t_termios); 2060 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n", 2061 tp->t_winsize.ws_row, tp->t_winsize.ws_col, 2062 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel); 2063 db_printf("\tcolumn: %u\n", tp->t_column); 2064 db_printf("\twritepos: %u\n", tp->t_writepos); 2065 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags); 2066 2067 /* Init/lock-state devices. */ 2068 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in); 2069 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out); 2070 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in); 2071 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out); 2072 2073 /* Hooks */ 2074 _db_show_devsw("\t", tp->t_devsw); 2075 _db_show_hooks("\t", tp->t_hook); 2076 2077 /* Process info. */ 2078 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp, 2079 tp->t_pgrp ? tp->t_pgrp->pg_id : 0, 2080 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0); 2081 db_printf("\tsession: %p", tp->t_session); 2082 if (tp->t_session != NULL) 2083 db_printf(" count %u leader %p tty %p sid %d login %s", 2084 tp->t_session->s_count, tp->t_session->s_leader, 2085 tp->t_session->s_ttyp, tp->t_session->s_sid, 2086 tp->t_session->s_login); 2087 db_printf("\n"); 2088 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt); 2089 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc); 2090 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc); 2091 db_printf("\tdev: %p\n", tp->t_dev); 2092 } 2093 2094 /* DDB command to list TTYs. */ 2095 DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys) 2096 { 2097 struct tty *tp; 2098 size_t isiz, osiz; 2099 int i, j; 2100 2101 /* Make the output look like `pstat -t'. */ 2102 db_printf("PTR "); 2103 #if defined(__LP64__) 2104 db_printf(" "); 2105 #endif 2106 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW " 2107 "COL SESS PGID STATE\n"); 2108 2109 TAILQ_FOREACH(tp, &tty_list, t_list) { 2110 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE; 2111 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE; 2112 2113 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ", 2114 tp, 2115 tty_devname(tp), 2116 isiz, 2117 tp->t_inq.ti_linestart - tp->t_inq.ti_begin, 2118 tp->t_inq.ti_end - tp->t_inq.ti_linestart, 2119 isiz - tp->t_inlow, 2120 osiz, 2121 tp->t_outq.to_end - tp->t_outq.to_begin, 2122 osiz - tp->t_outlow, 2123 MIN(tp->t_column, 99999), 2124 tp->t_session ? tp->t_session->s_sid : 0, 2125 tp->t_pgrp ? tp->t_pgrp->pg_id : 0); 2126 2127 /* Flag bits. */ 2128 for (i = j = 0; ttystates[i].flag; i++) 2129 if (tp->t_flags & ttystates[i].flag) { 2130 db_printf("%c", ttystates[i].val); 2131 j++; 2132 } 2133 if (j == 0) 2134 db_printf("-"); 2135 db_printf("\n"); 2136 } 2137 } 2138 #endif /* DDB */ 2139