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