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