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