tty.c revision 194771
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: head/sys/kern/tty.c 194771 2009-06-23 21:43:02Z ed $"); 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 68static MALLOC_DEFINE(M_TTY, "tty", "tty device"); 69 70static void tty_rel_free(struct tty *tp); 71 72static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list); 73static struct sx tty_list_sx; 74SX_SYSINIT(tty_list, &tty_list_sx, "tty list"); 75static unsigned int tty_list_count = 0; 76 77/* Character device of /dev/console. */ 78static struct cdev *dev_console; 79static 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 102static void 103tty_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 122static int 123tty_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 155static __inline int 156ttydev_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 169static void 170ttydev_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 */ 216static int 217ttydev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 218{ 219 struct tty *tp = dev->si_drv1; 220 int error = 0; 221 222 tty_lock(tp); 223 if (tty_gone(tp)) { 224 /* Device is already gone. */ 225 tty_unlock(tp); 226 return (ENXIO); 227 } 228 229 /* 230 * Block when other processes are currently opening or closing 231 * the TTY. 232 */ 233 while (tp->t_flags & TF_OPENCLOSE) { 234 error = tty_wait(tp, &tp->t_dcdwait); 235 if (error != 0) { 236 tty_unlock(tp); 237 return (error); 238 } 239 } 240 tp->t_flags |= TF_OPENCLOSE; 241 242 /* 243 * Make sure the "tty" and "cua" device cannot be opened at the 244 * same time. 245 */ 246 if (TTY_CALLOUT(tp, dev)) { 247 if (tp->t_flags & TF_OPENED_IN) { 248 error = EBUSY; 249 goto done; 250 } 251 } else { 252 if (tp->t_flags & TF_OPENED_OUT) { 253 error = EBUSY; 254 goto done; 255 } 256 } 257 258 if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) { 259 error = EBUSY; 260 goto done; 261 } 262 263 if (!tty_opened(tp)) { 264 /* Set proper termios flags. */ 265 if (TTY_CALLOUT(tp, dev)) { 266 tp->t_termios = tp->t_termios_init_out; 267 } else { 268 tp->t_termios = tp->t_termios_init_in; 269 } 270 ttydevsw_param(tp, &tp->t_termios); 271 272 ttydevsw_modem(tp, SER_DTR|SER_RTS, 0); 273 274 error = ttydevsw_open(tp); 275 if (error != 0) 276 goto done; 277 278 ttydisc_open(tp); 279 tty_watermarks(tp); 280 } 281 282 /* Wait for Carrier Detect. */ 283 if (!TTY_CALLOUT(tp, dev) && (oflags & O_NONBLOCK) == 0 && 284 (tp->t_termios.c_cflag & CLOCAL) == 0) { 285 while ((ttydevsw_modem(tp, 0, 0) & SER_DCD) == 0) { 286 error = tty_wait(tp, &tp->t_dcdwait); 287 if (error != 0) 288 goto done; 289 } 290 } 291 292 if (dev == dev_console) 293 tp->t_flags |= TF_OPENED_CONS; 294 else if (TTY_CALLOUT(tp, dev)) 295 tp->t_flags |= TF_OPENED_OUT; 296 else 297 tp->t_flags |= TF_OPENED_IN; 298 299done: tp->t_flags &= ~TF_OPENCLOSE; 300 cv_broadcast(&tp->t_dcdwait); 301 ttydev_leave(tp); 302 303 return (error); 304} 305 306static int 307ttydev_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 308{ 309 struct tty *tp = dev->si_drv1; 310 311 tty_lock(tp); 312 313 /* 314 * Don't actually close the device if it is being used as the 315 * console. 316 */ 317 MPASS((tp->t_flags & TF_OPENED) != TF_OPENED); 318 if (dev == dev_console) 319 tp->t_flags &= ~TF_OPENED_CONS; 320 else 321 tp->t_flags &= ~(TF_OPENED_IN|TF_OPENED_OUT); 322 323 if (tp->t_flags & TF_OPENED) { 324 tty_unlock(tp); 325 return (0); 326 } 327 328 /* 329 * This can only be called once. The callin and the callout 330 * devices cannot be opened at the same time. 331 */ 332 tp->t_flags &= ~(TF_EXCLUDE|TF_STOPPED); 333 334 /* Properly wake up threads that are stuck - revoke(). */ 335 tp->t_revokecnt++; 336 tty_wakeup(tp, FREAD|FWRITE); 337 cv_broadcast(&tp->t_bgwait); 338 cv_broadcast(&tp->t_dcdwait); 339 340 ttydev_leave(tp); 341 342 return (0); 343} 344 345static __inline int 346tty_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 353static int 354tty_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 409static int 410ttydev_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 */ 432done: if (error == ENXIO) 433 error = 0; 434 return (error); 435} 436 437static int 438ttydev_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_outserwait); 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_signal(&tp->t_outserwait); 468 } 469 470done: tty_unlock(tp); 471 return (error); 472} 473 474static int 475ttydev_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); 527done: tty_unlock(tp); 528 529 return (error); 530} 531 532static int 533ttydev_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 571static int 572ttydev_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 592static void 593tty_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 600static int 601tty_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 616static void 617tty_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 624static int 625tty_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 640static struct filterops tty_kqops_read = 641 { 1, NULL, tty_kqops_read_detach, tty_kqops_read_event }; 642static struct filterops tty_kqops_write = 643 { 1, NULL, tty_kqops_write_detach, tty_kqops_write_event }; 644 645static int 646ttydev_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 675static 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 693static int 694ttyil_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 707static int 708ttyil_close(struct cdev *dev, int flag, int mode, struct thread *td) 709{ 710 return (0); 711} 712 713static int 714ttyil_rdwr(struct cdev *dev, struct uio *uio, int ioflag) 715{ 716 return (ENODEV); 717} 718 719static int 720ttyil_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 754done: tty_unlock(tp); 755 return (error); 756} 757 758static 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 769static void 770tty_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 785void 786tty_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 806static int 807ttydevsw_defopen(struct tty *tp) 808{ 809 810 return (0); 811} 812 813static void 814ttydevsw_defclose(struct tty *tp) 815{ 816} 817 818static void 819ttydevsw_defoutwakeup(struct tty *tp) 820{ 821 822 panic("Terminal device has output, while not implemented"); 823} 824 825static void 826ttydevsw_definwakeup(struct tty *tp) 827{ 828} 829 830static int 831ttydevsw_defioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td) 832{ 833 834 return (ENOIOCTL); 835} 836 837static int 838ttydevsw_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 847static int 848ttydevsw_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 855static int 856ttydevsw_defmmap(struct tty *tp, vm_offset_t offset, vm_paddr_t *paddr, 857 int nprot) 858{ 859 860 return (-1); 861} 862 863static void 864ttydevsw_defpktnotify(struct tty *tp, char event) 865{ 866} 867 868static void 869ttydevsw_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 881struct tty * 882tty_alloc(struct ttydevsw *tsw, void *sc) 883{ 884 885 return (tty_alloc_mutex(tsw, sc, NULL)); 886} 887 888struct tty * 889tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex) 890{ 891 struct tty *tp; 892 893 /* Make sure the driver defines all routines. */ 894#define PATCH_FUNC(x) do { \ 895 if (tsw->tsw_ ## x == NULL) \ 896 tsw->tsw_ ## x = ttydevsw_def ## x; \ 897} while (0) 898 PATCH_FUNC(open); 899 PATCH_FUNC(close); 900 PATCH_FUNC(outwakeup); 901 PATCH_FUNC(inwakeup); 902 PATCH_FUNC(ioctl); 903 PATCH_FUNC(param); 904 PATCH_FUNC(modem); 905 PATCH_FUNC(mmap); 906 PATCH_FUNC(pktnotify); 907 PATCH_FUNC(free); 908#undef PATCH_FUNC 909 910 tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO); 911 tp->t_devsw = tsw; 912 tp->t_devswsoftc = sc; 913 tp->t_flags = tsw->tsw_flags; 914 915 tty_init_termios(tp); 916 917 cv_init(&tp->t_inwait, "ttyin"); 918 cv_init(&tp->t_outwait, "ttyout"); 919 cv_init(&tp->t_outserwait, "ttyosr"); 920 cv_init(&tp->t_bgwait, "ttybg"); 921 cv_init(&tp->t_dcdwait, "ttydcd"); 922 923 /* Allow drivers to use a custom mutex to lock the TTY. */ 924 if (mutex != NULL) { 925 tp->t_mtx = mutex; 926 } else { 927 tp->t_mtx = &tp->t_mtxobj; 928 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF); 929 } 930 931 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx); 932 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx); 933 934 sx_xlock(&tty_list_sx); 935 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 936 tty_list_count++; 937 sx_xunlock(&tty_list_sx); 938 939 return (tp); 940} 941 942static void 943tty_dealloc(void *arg) 944{ 945 struct tty *tp = arg; 946 947 sx_xlock(&tty_list_sx); 948 TAILQ_REMOVE(&tty_list, tp, t_list); 949 tty_list_count--; 950 sx_xunlock(&tty_list_sx); 951 952 /* Make sure we haven't leaked buffers. */ 953 MPASS(ttyinq_getsize(&tp->t_inq) == 0); 954 MPASS(ttyoutq_getsize(&tp->t_outq) == 0); 955 956 knlist_destroy(&tp->t_inpoll.si_note); 957 knlist_destroy(&tp->t_outpoll.si_note); 958 959 cv_destroy(&tp->t_inwait); 960 cv_destroy(&tp->t_outwait); 961 cv_destroy(&tp->t_bgwait); 962 cv_destroy(&tp->t_dcdwait); 963 cv_destroy(&tp->t_outserwait); 964 965 if (tp->t_mtx == &tp->t_mtxobj) 966 mtx_destroy(&tp->t_mtxobj); 967 ttydevsw_free(tp); 968 free(tp, M_TTY); 969} 970 971static void 972tty_rel_free(struct tty *tp) 973{ 974 struct cdev *dev; 975 976 tty_lock_assert(tp, MA_OWNED); 977 978#define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE) 979 if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) { 980 /* TTY is still in use. */ 981 tty_unlock(tp); 982 return; 983 } 984 985 /* TTY can be deallocated. */ 986 dev = tp->t_dev; 987 tp->t_dev = NULL; 988 tty_unlock(tp); 989 990 destroy_dev_sched_cb(dev, tty_dealloc, tp); 991} 992 993void 994tty_rel_pgrp(struct tty *tp, struct pgrp *pg) 995{ 996 MPASS(tp->t_sessioncnt > 0); 997 tty_lock_assert(tp, MA_OWNED); 998 999 if (tp->t_pgrp == pg) 1000 tp->t_pgrp = NULL; 1001 1002 tty_unlock(tp); 1003} 1004 1005void 1006tty_rel_sess(struct tty *tp, struct session *sess) 1007{ 1008 MPASS(tp->t_sessioncnt > 0); 1009 1010 /* Current session has left. */ 1011 if (tp->t_session == sess) { 1012 tp->t_session = NULL; 1013 MPASS(tp->t_pgrp == NULL); 1014 } 1015 tp->t_sessioncnt--; 1016 tty_rel_free(tp); 1017} 1018 1019void 1020tty_rel_gone(struct tty *tp) 1021{ 1022 MPASS(!tty_gone(tp)); 1023 1024 /* Simulate carrier removal. */ 1025 ttydisc_modem(tp, 0); 1026 1027 /* Wake up all blocked threads. */ 1028 tty_wakeup(tp, FREAD|FWRITE); 1029 cv_broadcast(&tp->t_bgwait); 1030 cv_broadcast(&tp->t_dcdwait); 1031 1032 tp->t_flags |= TF_GONE; 1033 tty_rel_free(tp); 1034} 1035 1036/* 1037 * Exposing information about current TTY's through sysctl 1038 */ 1039 1040static void 1041tty_to_xtty(struct tty *tp, struct xtty *xt) 1042{ 1043 tty_lock_assert(tp, MA_OWNED); 1044 1045 xt->xt_size = sizeof(struct xtty); 1046 xt->xt_insize = ttyinq_getsize(&tp->t_inq); 1047 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq); 1048 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq); 1049 xt->xt_inlow = tp->t_inlow; 1050 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq); 1051 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq); 1052 xt->xt_outlow = tp->t_outlow; 1053 xt->xt_column = tp->t_column; 1054 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1055 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0; 1056 xt->xt_flags = tp->t_flags; 1057 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV; 1058} 1059 1060static int 1061sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 1062{ 1063 unsigned long lsize; 1064 struct xtty *xtlist, *xt; 1065 struct tty *tp; 1066 int error; 1067 1068 sx_slock(&tty_list_sx); 1069 lsize = tty_list_count * sizeof(struct xtty); 1070 if (lsize == 0) { 1071 sx_sunlock(&tty_list_sx); 1072 return (0); 1073 } 1074 1075 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK); 1076 1077 TAILQ_FOREACH(tp, &tty_list, t_list) { 1078 tty_lock(tp); 1079 tty_to_xtty(tp, xt); 1080 tty_unlock(tp); 1081 xt++; 1082 } 1083 sx_sunlock(&tty_list_sx); 1084 1085 error = SYSCTL_OUT(req, xtlist, lsize); 1086 free(xtlist, M_TTY); 1087 return (error); 1088} 1089 1090SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 1091 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs"); 1092 1093/* 1094 * Device node creation. Device has been set up, now we can expose it to 1095 * the user. 1096 */ 1097 1098void 1099tty_makedev(struct tty *tp, struct ucred *cred, const char *fmt, ...) 1100{ 1101 va_list ap; 1102 struct cdev *dev; 1103 const char *prefix = "tty"; 1104 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */ 1105 uid_t uid; 1106 gid_t gid; 1107 mode_t mode; 1108 1109 /* Remove "tty" prefix from devices like PTY's. */ 1110 if (tp->t_flags & TF_NOPREFIX) 1111 prefix = ""; 1112 1113 va_start(ap, fmt); 1114 vsnrprintf(name, sizeof name, 32, fmt, ap); 1115 va_end(ap); 1116 1117 if (cred == NULL) { 1118 /* System device. */ 1119 uid = UID_ROOT; 1120 gid = GID_WHEEL; 1121 mode = S_IRUSR|S_IWUSR; 1122 } else { 1123 /* User device. */ 1124 uid = cred->cr_ruid; 1125 gid = GID_TTY; 1126 mode = S_IRUSR|S_IWUSR|S_IWGRP; 1127 } 1128 1129 /* Master call-in device. */ 1130 dev = make_dev_cred(&ttydev_cdevsw, 0, cred, 1131 uid, gid, mode, "%s%s", prefix, name); 1132 dev->si_drv1 = tp; 1133 tp->t_dev = dev; 1134 1135 /* Slave call-in devices. */ 1136 if (tp->t_flags & TF_INITLOCK) { 1137 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1138 uid, gid, mode, "%s%s.init", prefix, name); 1139 dev_depends(tp->t_dev, dev); 1140 dev->si_drv1 = tp; 1141 dev->si_drv2 = &tp->t_termios_init_in; 1142 1143 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1144 uid, gid, mode, "%s%s.lock", prefix, name); 1145 dev_depends(tp->t_dev, dev); 1146 dev->si_drv1 = tp; 1147 dev->si_drv2 = &tp->t_termios_lock_in; 1148 } 1149 1150 /* Call-out devices. */ 1151 if (tp->t_flags & TF_CALLOUT) { 1152 dev = make_dev_cred(&ttydev_cdevsw, 0, cred, 1153 UID_UUCP, GID_DIALER, 0660, "cua%s", name); 1154 dev_depends(tp->t_dev, dev); 1155 dev->si_drv1 = tp; 1156 1157 /* Slave call-out devices. */ 1158 if (tp->t_flags & TF_INITLOCK) { 1159 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1160 UID_UUCP, GID_DIALER, 0660, "cua%s.init", name); 1161 dev_depends(tp->t_dev, dev); 1162 dev->si_drv1 = tp; 1163 dev->si_drv2 = &tp->t_termios_init_out; 1164 1165 dev = make_dev_cred(&ttyil_cdevsw, 0, cred, 1166 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", name); 1167 dev_depends(tp->t_dev, dev); 1168 dev->si_drv1 = tp; 1169 dev->si_drv2 = &tp->t_termios_lock_out; 1170 } 1171 } 1172} 1173 1174/* 1175 * Signalling processes. 1176 */ 1177 1178void 1179tty_signal_sessleader(struct tty *tp, int sig) 1180{ 1181 struct proc *p; 1182 1183 tty_lock_assert(tp, MA_OWNED); 1184 MPASS(sig >= 1 && sig < NSIG); 1185 1186 /* Make signals start output again. */ 1187 tp->t_flags &= ~TF_STOPPED; 1188 1189 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) { 1190 p = tp->t_session->s_leader; 1191 PROC_LOCK(p); 1192 psignal(p, sig); 1193 PROC_UNLOCK(p); 1194 } 1195} 1196 1197void 1198tty_signal_pgrp(struct tty *tp, int sig) 1199{ 1200 tty_lock_assert(tp, MA_OWNED); 1201 MPASS(sig >= 1 && sig < NSIG); 1202 1203 /* Make signals start output again. */ 1204 tp->t_flags &= ~TF_STOPPED; 1205 1206 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO)) 1207 tty_info(tp); 1208 if (tp->t_pgrp != NULL) { 1209 PGRP_LOCK(tp->t_pgrp); 1210 pgsignal(tp->t_pgrp, sig, 1); 1211 PGRP_UNLOCK(tp->t_pgrp); 1212 } 1213} 1214 1215void 1216tty_wakeup(struct tty *tp, int flags) 1217{ 1218 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL) 1219 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 1220 1221 if (flags & FWRITE) { 1222 cv_broadcast(&tp->t_outwait); 1223 selwakeup(&tp->t_outpoll); 1224 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0); 1225 } 1226 if (flags & FREAD) { 1227 cv_broadcast(&tp->t_inwait); 1228 selwakeup(&tp->t_inpoll); 1229 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0); 1230 } 1231} 1232 1233int 1234tty_wait(struct tty *tp, struct cv *cv) 1235{ 1236 int error; 1237 int revokecnt = tp->t_revokecnt; 1238 1239 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1240 MPASS(!tty_gone(tp)); 1241 1242 error = cv_wait_sig(cv, tp->t_mtx); 1243 1244 /* Restart the system call when we may have been revoked. */ 1245 if (tp->t_revokecnt != revokecnt) 1246 return (ERESTART); 1247 1248 /* Bail out when the device slipped away. */ 1249 if (tty_gone(tp)) 1250 return (ENXIO); 1251 1252 return (error); 1253} 1254 1255int 1256tty_timedwait(struct tty *tp, struct cv *cv, int hz) 1257{ 1258 int error; 1259 int revokecnt = tp->t_revokecnt; 1260 1261 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1262 MPASS(!tty_gone(tp)); 1263 1264 error = cv_timedwait_sig(cv, tp->t_mtx, hz); 1265 1266 /* Restart the system call when we may have been revoked. */ 1267 if (tp->t_revokecnt != revokecnt) 1268 return (ERESTART); 1269 1270 /* Bail out when the device slipped away. */ 1271 if (tty_gone(tp)) 1272 return (ENXIO); 1273 1274 return (error); 1275} 1276 1277void 1278tty_flush(struct tty *tp, int flags) 1279{ 1280 if (flags & FWRITE) { 1281 tp->t_flags &= ~TF_HIWAT_OUT; 1282 ttyoutq_flush(&tp->t_outq); 1283 tty_wakeup(tp, FWRITE); 1284 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE); 1285 } 1286 if (flags & FREAD) { 1287 tty_hiwat_in_unblock(tp); 1288 ttyinq_flush(&tp->t_inq); 1289 ttydevsw_inwakeup(tp); 1290 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD); 1291 } 1292} 1293 1294static int 1295tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, struct thread *td) 1296{ 1297 int error; 1298 1299 switch (cmd) { 1300 /* 1301 * Modem commands. 1302 * The SER_* and TIOCM_* flags are the same, but one bit 1303 * shifted. I don't know why. 1304 */ 1305 case TIOCSDTR: 1306 ttydevsw_modem(tp, SER_DTR, 0); 1307 return (0); 1308 case TIOCCDTR: 1309 ttydevsw_modem(tp, 0, SER_DTR); 1310 return (0); 1311 case TIOCMSET: { 1312 int bits = *(int *)data; 1313 ttydevsw_modem(tp, 1314 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 1315 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1316 return (0); 1317 } 1318 case TIOCMBIS: { 1319 int bits = *(int *)data; 1320 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0); 1321 return (0); 1322 } 1323 case TIOCMBIC: { 1324 int bits = *(int *)data; 1325 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1326 return (0); 1327 } 1328 case TIOCMGET: 1329 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1); 1330 return (0); 1331 1332 case FIOASYNC: 1333 if (*(int *)data) 1334 tp->t_flags |= TF_ASYNC; 1335 else 1336 tp->t_flags &= ~TF_ASYNC; 1337 return (0); 1338 case FIONBIO: 1339 /* This device supports non-blocking operation. */ 1340 return (0); 1341 case FIONREAD: 1342 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq); 1343 return (0); 1344 case FIOSETOWN: 1345 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1346 /* Not allowed to set ownership. */ 1347 return (ENOTTY); 1348 1349 /* Temporarily unlock the TTY to set ownership. */ 1350 tty_unlock(tp); 1351 error = fsetown(*(int *)data, &tp->t_sigio); 1352 tty_lock(tp); 1353 return (error); 1354 case FIOGETOWN: 1355 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1356 /* Not allowed to set ownership. */ 1357 return (ENOTTY); 1358 1359 /* Get ownership. */ 1360 *(int *)data = fgetown(&tp->t_sigio); 1361 return (0); 1362 case TIOCGETA: 1363 /* Obtain terminal flags through tcgetattr(). */ 1364 *(struct termios*)data = tp->t_termios; 1365 return (0); 1366 case TIOCSETA: 1367 case TIOCSETAW: 1368 case TIOCSETAF: { 1369 struct termios *t = data; 1370 1371 /* 1372 * Who makes up these funny rules? According to POSIX, 1373 * input baud rate is set equal to the output baud rate 1374 * when zero. 1375 */ 1376 if (t->c_ispeed == 0) 1377 t->c_ispeed = t->c_ospeed; 1378 1379 /* Discard any unsupported bits. */ 1380 t->c_iflag &= TTYSUP_IFLAG; 1381 t->c_oflag &= TTYSUP_OFLAG; 1382 t->c_lflag &= TTYSUP_LFLAG; 1383 t->c_cflag &= TTYSUP_CFLAG; 1384 1385 /* Set terminal flags through tcsetattr(). */ 1386 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1387 error = tty_drain(tp); 1388 if (error) 1389 return (error); 1390 if (cmd == TIOCSETAF) 1391 tty_flush(tp, FREAD); 1392 } 1393 1394 /* 1395 * Only call param() when the flags really change. 1396 */ 1397 if ((t->c_cflag & CIGNORE) == 0 && 1398 (tp->t_termios.c_cflag != t->c_cflag || 1399 tp->t_termios.c_ispeed != t->c_ispeed || 1400 tp->t_termios.c_ospeed != t->c_ospeed)) { 1401 error = ttydevsw_param(tp, t); 1402 if (error) 1403 return (error); 1404 1405 /* XXX: CLOCAL? */ 1406 1407 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE; 1408 tp->t_termios.c_ispeed = t->c_ispeed; 1409 tp->t_termios.c_ospeed = t->c_ospeed; 1410 1411 /* Baud rate has changed - update watermarks. */ 1412 tty_watermarks(tp); 1413 } 1414 1415 /* Copy new non-device driver parameters. */ 1416 tp->t_termios.c_iflag = t->c_iflag; 1417 tp->t_termios.c_oflag = t->c_oflag; 1418 tp->t_termios.c_lflag = t->c_lflag; 1419 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc); 1420 1421 ttydisc_optimize(tp); 1422 1423 if ((t->c_lflag & ICANON) == 0) { 1424 /* 1425 * When in non-canonical mode, wake up all 1426 * readers. Canonicalize any partial input. VMIN 1427 * and VTIME could also be adjusted. 1428 */ 1429 ttyinq_canonicalize(&tp->t_inq); 1430 tty_wakeup(tp, FREAD); 1431 } 1432 1433 /* 1434 * For packet mode: notify the PTY consumer that VSTOP 1435 * and VSTART may have been changed. 1436 */ 1437 if (tp->t_termios.c_iflag & IXON && 1438 tp->t_termios.c_cc[VSTOP] == CTRL('S') && 1439 tp->t_termios.c_cc[VSTART] == CTRL('Q')) 1440 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP); 1441 else 1442 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP); 1443 return (0); 1444 } 1445 case TIOCGETD: 1446 /* For compatibility - we only support TTYDISC. */ 1447 *(int *)data = TTYDISC; 1448 return (0); 1449 case TIOCGPGRP: 1450 if (!tty_is_ctty(tp, td->td_proc)) 1451 return (ENOTTY); 1452 1453 if (tp->t_pgrp != NULL) 1454 *(int *)data = tp->t_pgrp->pg_id; 1455 else 1456 *(int *)data = NO_PID; 1457 return (0); 1458 case TIOCGSID: 1459 if (!tty_is_ctty(tp, td->td_proc)) 1460 return (ENOTTY); 1461 1462 MPASS(tp->t_session); 1463 *(int *)data = tp->t_session->s_sid; 1464 return (0); 1465 case TIOCSCTTY: { 1466 struct proc *p = td->td_proc; 1467 1468 /* XXX: This looks awful. */ 1469 tty_unlock(tp); 1470 sx_xlock(&proctree_lock); 1471 tty_lock(tp); 1472 1473 if (!SESS_LEADER(p)) { 1474 /* Only the session leader may do this. */ 1475 sx_xunlock(&proctree_lock); 1476 return (EPERM); 1477 } 1478 1479 if (tp->t_session != NULL && tp->t_session == p->p_session) { 1480 /* This is already our controlling TTY. */ 1481 sx_xunlock(&proctree_lock); 1482 return (0); 1483 } 1484 1485 if (p->p_session->s_ttyp != NULL || 1486 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL && 1487 tp->t_session->s_ttyvp->v_type != VBAD)) { 1488 /* 1489 * There is already a relation between a TTY and 1490 * a session, or the caller is not the session 1491 * leader. 1492 * 1493 * Allow the TTY to be stolen when the vnode is 1494 * invalid, but the reference to the TTY is 1495 * still active. This allows immediate reuse of 1496 * TTYs of which the session leader has been 1497 * killed or the TTY revoked. 1498 */ 1499 sx_xunlock(&proctree_lock); 1500 return (EPERM); 1501 } 1502 1503 /* Connect the session to the TTY. */ 1504 tp->t_session = p->p_session; 1505 tp->t_session->s_ttyp = tp; 1506 tp->t_sessioncnt++; 1507 sx_xunlock(&proctree_lock); 1508 1509 /* Assign foreground process group. */ 1510 tp->t_pgrp = p->p_pgrp; 1511 PROC_LOCK(p); 1512 p->p_flag |= P_CONTROLT; 1513 PROC_UNLOCK(p); 1514 1515 return (0); 1516 } 1517 case TIOCSPGRP: { 1518 struct pgrp *pg; 1519 1520 /* 1521 * XXX: Temporarily unlock the TTY to locate the process 1522 * group. This code would be lot nicer if we would ever 1523 * decompose proctree_lock. 1524 */ 1525 tty_unlock(tp); 1526 sx_slock(&proctree_lock); 1527 pg = pgfind(*(int *)data); 1528 if (pg != NULL) 1529 PGRP_UNLOCK(pg); 1530 if (pg == NULL || pg->pg_session != td->td_proc->p_session) { 1531 sx_sunlock(&proctree_lock); 1532 tty_lock(tp); 1533 return (EPERM); 1534 } 1535 tty_lock(tp); 1536 1537 /* 1538 * Determine if this TTY is the controlling TTY after 1539 * relocking the TTY. 1540 */ 1541 if (!tty_is_ctty(tp, td->td_proc)) { 1542 sx_sunlock(&proctree_lock); 1543 return (ENOTTY); 1544 } 1545 tp->t_pgrp = pg; 1546 sx_sunlock(&proctree_lock); 1547 1548 /* Wake up the background process groups. */ 1549 cv_broadcast(&tp->t_bgwait); 1550 return (0); 1551 } 1552 case TIOCFLUSH: { 1553 int flags = *(int *)data; 1554 1555 if (flags == 0) 1556 flags = (FREAD|FWRITE); 1557 else 1558 flags &= (FREAD|FWRITE); 1559 tty_flush(tp, flags); 1560 return (0); 1561 } 1562 case TIOCDRAIN: 1563 /* Drain TTY output. */ 1564 return tty_drain(tp); 1565 case TIOCCONS: 1566 /* Set terminal as console TTY. */ 1567 if (*(int *)data) { 1568 error = priv_check(td, PRIV_TTY_CONSOLE); 1569 if (error) 1570 return (error); 1571 1572 /* 1573 * XXX: constty should really need to be locked! 1574 * XXX: allow disconnected constty's to be stolen! 1575 */ 1576 1577 if (constty == tp) 1578 return (0); 1579 if (constty != NULL) 1580 return (EBUSY); 1581 1582 tty_unlock(tp); 1583 constty_set(tp); 1584 tty_lock(tp); 1585 } else if (constty == tp) { 1586 constty_clear(); 1587 } 1588 return (0); 1589 case TIOCGWINSZ: 1590 /* Obtain window size. */ 1591 *(struct winsize*)data = tp->t_winsize; 1592 return (0); 1593 case TIOCSWINSZ: 1594 /* Set window size. */ 1595 if (bcmp(&tp->t_winsize, data, sizeof(struct winsize)) == 0) 1596 return (0); 1597 tp->t_winsize = *(struct winsize*)data; 1598 tty_signal_pgrp(tp, SIGWINCH); 1599 return (0); 1600 case TIOCEXCL: 1601 tp->t_flags |= TF_EXCLUDE; 1602 return (0); 1603 case TIOCNXCL: 1604 tp->t_flags &= ~TF_EXCLUDE; 1605 return (0); 1606 case TIOCOUTQ: 1607 *(unsigned int *)data = ttyoutq_bytesused(&tp->t_outq); 1608 return (0); 1609 case TIOCSTOP: 1610 tp->t_flags |= TF_STOPPED; 1611 ttydevsw_pktnotify(tp, TIOCPKT_STOP); 1612 return (0); 1613 case TIOCSTART: 1614 tp->t_flags &= ~TF_STOPPED; 1615 ttydevsw_outwakeup(tp); 1616 ttydevsw_pktnotify(tp, TIOCPKT_START); 1617 return (0); 1618 case TIOCSTAT: 1619 tty_info(tp); 1620 return (0); 1621 } 1622 1623#ifdef COMPAT_43TTY 1624 return tty_ioctl_compat(tp, cmd, data, td); 1625#else /* !COMPAT_43TTY */ 1626 return (ENOIOCTL); 1627#endif /* COMPAT_43TTY */ 1628} 1629 1630int 1631tty_ioctl(struct tty *tp, u_long cmd, void *data, struct thread *td) 1632{ 1633 int error; 1634 1635 tty_lock_assert(tp, MA_OWNED); 1636 1637 if (tty_gone(tp)) 1638 return (ENXIO); 1639 1640 error = ttydevsw_ioctl(tp, cmd, data, td); 1641 if (error == ENOIOCTL) 1642 error = tty_generic_ioctl(tp, cmd, data, td); 1643 1644 return (error); 1645} 1646 1647dev_t 1648tty_udev(struct tty *tp) 1649{ 1650 if (tp->t_dev) 1651 return dev2udev(tp->t_dev); 1652 else 1653 return NODEV; 1654} 1655 1656int 1657tty_checkoutq(struct tty *tp) 1658{ 1659 1660 /* 256 bytes should be enough to print a log message. */ 1661 return (ttyoutq_bytesleft(&tp->t_outq) >= 256); 1662} 1663 1664void 1665tty_hiwat_in_block(struct tty *tp) 1666{ 1667 1668 if ((tp->t_flags & TF_HIWAT_IN) == 0 && 1669 tp->t_termios.c_iflag & IXOFF && 1670 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) { 1671 /* 1672 * Input flow control. Only enter the high watermark when we 1673 * can successfully store the VSTOP character. 1674 */ 1675 if (ttyoutq_write_nofrag(&tp->t_outq, 1676 &tp->t_termios.c_cc[VSTOP], 1) == 0) 1677 tp->t_flags |= TF_HIWAT_IN; 1678 } else { 1679 /* No input flow control. */ 1680 tp->t_flags |= TF_HIWAT_IN; 1681 } 1682} 1683 1684void 1685tty_hiwat_in_unblock(struct tty *tp) 1686{ 1687 1688 if (tp->t_flags & TF_HIWAT_IN && 1689 tp->t_termios.c_iflag & IXOFF && 1690 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) { 1691 /* 1692 * Input flow control. Only leave the high watermark when we 1693 * can successfully store the VSTART character. 1694 */ 1695 if (ttyoutq_write_nofrag(&tp->t_outq, 1696 &tp->t_termios.c_cc[VSTART], 1) == 0) 1697 tp->t_flags &= ~TF_HIWAT_IN; 1698 } else { 1699 /* No input flow control. */ 1700 tp->t_flags &= ~TF_HIWAT_IN; 1701 } 1702 1703 if (!tty_gone(tp)) 1704 ttydevsw_inwakeup(tp); 1705} 1706 1707/* 1708 * TTY hooks interface. 1709 */ 1710 1711static int 1712ttyhook_defrint(struct tty *tp, char c, int flags) 1713{ 1714 1715 if (ttyhook_rint_bypass(tp, &c, 1) != 1) 1716 return (-1); 1717 1718 return (0); 1719} 1720 1721int 1722ttyhook_register(struct tty **rtp, struct proc *p, int fd, 1723 struct ttyhook *th, void *softc) 1724{ 1725 struct tty *tp; 1726 struct file *fp; 1727 struct cdev *dev; 1728 struct cdevsw *cdp; 1729 struct filedesc *fdp; 1730 int error; 1731 1732 /* Validate the file descriptor. */ 1733 if ((fdp = p->p_fd) == NULL) 1734 return (EBADF); 1735 1736 fp = fget_unlocked(fdp, fd); 1737 if (fp == NULL) 1738 return (EBADF); 1739 if (fp->f_ops == &badfileops) { 1740 error = EBADF; 1741 goto done1; 1742 } 1743 1744 /* 1745 * Make sure the vnode is bound to a character device. 1746 * Unlocked check for the vnode type is ok there, because we 1747 * only shall prevent calling devvn_refthread on the file that 1748 * never has been opened over a character device. 1749 */ 1750 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) { 1751 error = EINVAL; 1752 goto done1; 1753 } 1754 1755 /* Make sure it is a TTY. */ 1756 cdp = devvn_refthread(fp->f_vnode, &dev); 1757 if (cdp == NULL) { 1758 error = ENXIO; 1759 goto done1; 1760 } 1761 if (dev != fp->f_data) { 1762 error = ENXIO; 1763 goto done2; 1764 } 1765 if (cdp != &ttydev_cdevsw) { 1766 error = ENOTTY; 1767 goto done2; 1768 } 1769 tp = dev->si_drv1; 1770 1771 /* Try to attach the hook to the TTY. */ 1772 error = EBUSY; 1773 tty_lock(tp); 1774 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0)); 1775 if (tp->t_flags & TF_HOOK) 1776 goto done3; 1777 1778 tp->t_flags |= TF_HOOK; 1779 tp->t_hook = th; 1780 tp->t_hooksoftc = softc; 1781 *rtp = tp; 1782 error = 0; 1783 1784 /* Maybe we can switch into bypass mode now. */ 1785 ttydisc_optimize(tp); 1786 1787 /* Silently convert rint() calls to rint_bypass() when possible. */ 1788 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass)) 1789 th->th_rint = ttyhook_defrint; 1790 1791done3: tty_unlock(tp); 1792done2: dev_relthread(dev); 1793done1: fdrop(fp, curthread); 1794 return (error); 1795} 1796 1797void 1798ttyhook_unregister(struct tty *tp) 1799{ 1800 1801 tty_lock_assert(tp, MA_OWNED); 1802 MPASS(tp->t_flags & TF_HOOK); 1803 1804 /* Disconnect the hook. */ 1805 tp->t_flags &= ~TF_HOOK; 1806 tp->t_hook = NULL; 1807 1808 /* Maybe we need to leave bypass mode. */ 1809 ttydisc_optimize(tp); 1810 1811 /* Maybe deallocate the TTY as well. */ 1812 tty_rel_free(tp); 1813} 1814 1815/* 1816 * /dev/console handling. 1817 */ 1818 1819static int 1820ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 1821{ 1822 struct tty *tp; 1823 1824 /* System has no console device. */ 1825 if (dev_console_filename == NULL) 1826 return (ENXIO); 1827 1828 /* Look up corresponding TTY by device name. */ 1829 sx_slock(&tty_list_sx); 1830 TAILQ_FOREACH(tp, &tty_list, t_list) { 1831 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) { 1832 dev_console->si_drv1 = tp; 1833 break; 1834 } 1835 } 1836 sx_sunlock(&tty_list_sx); 1837 1838 /* System console has no TTY associated. */ 1839 if (dev_console->si_drv1 == NULL) 1840 return (ENXIO); 1841 1842 return (ttydev_open(dev, oflags, devtype, td)); 1843} 1844 1845static int 1846ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag) 1847{ 1848 1849 log_console(uio); 1850 1851 return (ttydev_write(dev, uio, ioflag)); 1852} 1853 1854/* 1855 * /dev/console is a little different than normal TTY's. When opened, 1856 * it determines which TTY to use. When data gets written to it, it 1857 * will be logged in the kernel message buffer. 1858 */ 1859static struct cdevsw ttyconsdev_cdevsw = { 1860 .d_version = D_VERSION, 1861 .d_open = ttyconsdev_open, 1862 .d_close = ttydev_close, 1863 .d_read = ttydev_read, 1864 .d_write = ttyconsdev_write, 1865 .d_ioctl = ttydev_ioctl, 1866 .d_kqfilter = ttydev_kqfilter, 1867 .d_poll = ttydev_poll, 1868 .d_mmap = ttydev_mmap, 1869 .d_name = "ttyconsdev", 1870 .d_flags = D_TTY, 1871}; 1872 1873static void 1874ttyconsdev_init(void *unused) 1875{ 1876 1877 dev_console = make_dev(&ttyconsdev_cdevsw, 0, UID_ROOT, GID_WHEEL, 1878 0600, "console"); 1879} 1880 1881SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL); 1882 1883void 1884ttyconsdev_select(const char *name) 1885{ 1886 1887 dev_console_filename = name; 1888} 1889 1890/* 1891 * Debugging routines. 1892 */ 1893 1894#include "opt_ddb.h" 1895#ifdef DDB 1896#include <ddb/ddb.h> 1897#include <ddb/db_sym.h> 1898 1899static struct { 1900 int flag; 1901 char val; 1902} ttystates[] = { 1903#if 0 1904 { TF_NOPREFIX, 'N' }, 1905#endif 1906 { TF_INITLOCK, 'I' }, 1907 { TF_CALLOUT, 'C' }, 1908 1909 /* Keep these together -> 'Oi' and 'Oo'. */ 1910 { TF_OPENED, 'O' }, 1911 { TF_OPENED_IN, 'i' }, 1912 { TF_OPENED_OUT, 'o' }, 1913 { TF_OPENED_CONS, 'c' }, 1914 1915 { TF_GONE, 'G' }, 1916 { TF_OPENCLOSE, 'B' }, 1917 { TF_ASYNC, 'Y' }, 1918 { TF_LITERAL, 'L' }, 1919 1920 /* Keep these together -> 'Hi' and 'Ho'. */ 1921 { TF_HIWAT, 'H' }, 1922 { TF_HIWAT_IN, 'i' }, 1923 { TF_HIWAT_OUT, 'o' }, 1924 1925 { TF_STOPPED, 'S' }, 1926 { TF_EXCLUDE, 'X' }, 1927 { TF_BYPASS, 'l' }, 1928 { TF_ZOMBIE, 'Z' }, 1929 { TF_HOOK, 's' }, 1930 1931 /* Keep these together -> 'bi' and 'bo'. */ 1932 { TF_BUSY, 'b' }, 1933 { TF_BUSY_IN, 'i' }, 1934 { TF_BUSY_OUT, 'o' }, 1935 1936 { 0, '\0'}, 1937}; 1938 1939#define TTY_FLAG_BITS \ 1940 "\20\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \ 1941 "\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \ 1942 "\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK" 1943 1944#define DB_PRINTSYM(name, addr) \ 1945 db_printf("%s " #name ": ", sep); \ 1946 db_printsym((db_addr_t) addr, DB_STGY_ANY); \ 1947 db_printf("\n"); 1948 1949static void 1950_db_show_devsw(const char *sep, const struct ttydevsw *tsw) 1951{ 1952 db_printf("%sdevsw: ", sep); 1953 db_printsym((db_addr_t)tsw, DB_STGY_ANY); 1954 db_printf(" (%p)\n", tsw); 1955 DB_PRINTSYM(open, tsw->tsw_open); 1956 DB_PRINTSYM(close, tsw->tsw_close); 1957 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup); 1958 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup); 1959 DB_PRINTSYM(ioctl, tsw->tsw_ioctl); 1960 DB_PRINTSYM(param, tsw->tsw_param); 1961 DB_PRINTSYM(modem, tsw->tsw_modem); 1962 DB_PRINTSYM(mmap, tsw->tsw_mmap); 1963 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify); 1964 DB_PRINTSYM(free, tsw->tsw_free); 1965} 1966static void 1967_db_show_hooks(const char *sep, const struct ttyhook *th) 1968{ 1969 db_printf("%shook: ", sep); 1970 db_printsym((db_addr_t)th, DB_STGY_ANY); 1971 db_printf(" (%p)\n", th); 1972 if (th == NULL) 1973 return; 1974 DB_PRINTSYM(rint, th->th_rint); 1975 DB_PRINTSYM(rint_bypass, th->th_rint_bypass); 1976 DB_PRINTSYM(rint_done, th->th_rint_done); 1977 DB_PRINTSYM(rint_poll, th->th_rint_poll); 1978 DB_PRINTSYM(getc_inject, th->th_getc_inject); 1979 DB_PRINTSYM(getc_capture, th->th_getc_capture); 1980 DB_PRINTSYM(getc_poll, th->th_getc_poll); 1981 DB_PRINTSYM(close, th->th_close); 1982} 1983 1984static void 1985_db_show_termios(const char *name, const struct termios *t) 1986{ 1987 1988 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x " 1989 "lflag 0x%x ispeed %u ospeed %u\n", name, 1990 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag, 1991 t->c_ispeed, t->c_ospeed); 1992} 1993 1994/* DDB command to show TTY statistics. */ 1995DB_SHOW_COMMAND(tty, db_show_tty) 1996{ 1997 struct tty *tp; 1998 1999 if (!have_addr) { 2000 db_printf("usage: show tty <addr>\n"); 2001 return; 2002 } 2003 tp = (struct tty *)addr; 2004 2005 db_printf("0x%p: %s\n", tp, tty_devname(tp)); 2006 db_printf("\tmtx: %p\n", tp->t_mtx); 2007 db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS); 2008 db_printf("\trevokecnt: %u\n", tp->t_revokecnt); 2009 2010 /* Buffering mechanisms. */ 2011 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u " 2012 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin, 2013 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end, 2014 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota); 2015 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n", 2016 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end, 2017 tp->t_outq.to_nblocks, tp->t_outq.to_quota); 2018 db_printf("\tinlow: %zu\n", tp->t_inlow); 2019 db_printf("\toutlow: %zu\n", tp->t_outlow); 2020 _db_show_termios("\ttermios", &tp->t_termios); 2021 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n", 2022 tp->t_winsize.ws_row, tp->t_winsize.ws_col, 2023 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel); 2024 db_printf("\tcolumn: %u\n", tp->t_column); 2025 db_printf("\twritepos: %u\n", tp->t_writepos); 2026 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags); 2027 2028 /* Init/lock-state devices. */ 2029 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in); 2030 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out); 2031 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in); 2032 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out); 2033 2034 /* Hooks */ 2035 _db_show_devsw("\t", tp->t_devsw); 2036 _db_show_hooks("\t", tp->t_hook); 2037 2038 /* Process info. */ 2039 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp, 2040 tp->t_pgrp ? tp->t_pgrp->pg_id : 0, 2041 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0); 2042 db_printf("\tsession: %p", tp->t_session); 2043 if (tp->t_session != NULL) 2044 db_printf(" count %u leader %p tty %p sid %d login %s", 2045 tp->t_session->s_count, tp->t_session->s_leader, 2046 tp->t_session->s_ttyp, tp->t_session->s_sid, 2047 tp->t_session->s_login); 2048 db_printf("\n"); 2049 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt); 2050 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc); 2051 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc); 2052 db_printf("\tdev: %p\n", tp->t_dev); 2053} 2054 2055/* DDB command to list TTYs. */ 2056DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys) 2057{ 2058 struct tty *tp; 2059 size_t isiz, osiz; 2060 int i, j; 2061 2062 /* Make the output look like `pstat -t'. */ 2063 db_printf("PTR "); 2064#if defined(__LP64__) 2065 db_printf(" "); 2066#endif 2067 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW " 2068 "COL SESS PGID STATE\n"); 2069 2070 TAILQ_FOREACH(tp, &tty_list, t_list) { 2071 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE; 2072 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE; 2073 2074 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ", 2075 tp, 2076 tty_devname(tp), 2077 isiz, 2078 tp->t_inq.ti_linestart - tp->t_inq.ti_begin, 2079 tp->t_inq.ti_end - tp->t_inq.ti_linestart, 2080 isiz - tp->t_inlow, 2081 osiz, 2082 tp->t_outq.to_end - tp->t_outq.to_begin, 2083 osiz - tp->t_outlow, 2084 MIN(tp->t_column, 99999), 2085 tp->t_session ? tp->t_session->s_sid : 0, 2086 tp->t_pgrp ? tp->t_pgrp->pg_id : 0); 2087 2088 /* Flag bits. */ 2089 for (i = j = 0; ttystates[i].flag; i++) 2090 if (tp->t_flags & ttystates[i].flag) { 2091 db_printf("%c", ttystates[i].val); 2092 j++; 2093 } 2094 if (j == 0) 2095 db_printf("-"); 2096 db_printf("\n"); 2097 } 2098} 2099#endif /* DDB */ 2100