tty.c revision 259441
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 259441 2013-12-16 00:50:14Z marcel $"); 32 33#include "opt_capsicum.h" 34#include "opt_compat.h" 35 36#include <sys/param.h> 37#include <sys/capability.h> 38#include <sys/conf.h> 39#include <sys/cons.h> 40#include <sys/fcntl.h> 41#include <sys/file.h> 42#include <sys/filedesc.h> 43#include <sys/filio.h> 44#ifdef COMPAT_43TTY 45#include <sys/ioctl_compat.h> 46#endif /* COMPAT_43TTY */ 47#include <sys/kernel.h> 48#include <sys/limits.h> 49#include <sys/malloc.h> 50#include <sys/mount.h> 51#include <sys/poll.h> 52#include <sys/priv.h> 53#include <sys/proc.h> 54#include <sys/serial.h> 55#include <sys/signal.h> 56#include <sys/stat.h> 57#include <sys/sx.h> 58#include <sys/sysctl.h> 59#include <sys/systm.h> 60#include <sys/tty.h> 61#include <sys/ttycom.h> 62#define TTYDEFCHARS 63#include <sys/ttydefaults.h> 64#undef TTYDEFCHARS 65#include <sys/ucred.h> 66#include <sys/vnode.h> 67 68#include <machine/stdarg.h> 69 70static MALLOC_DEFINE(M_TTY, "tty", "tty device"); 71 72static void tty_rel_free(struct tty *tp); 73 74static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list); 75static struct sx tty_list_sx; 76SX_SYSINIT(tty_list, &tty_list_sx, "tty list"); 77static unsigned int tty_list_count = 0; 78 79/* Character device of /dev/console. */ 80static struct cdev *dev_console; 81static const char *dev_console_filename; 82 83/* 84 * Flags that are supported and stored by this implementation. 85 */ 86#define TTYSUP_IFLAG (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK|ISTRIP|\ 87 INLCR|IGNCR|ICRNL|IXON|IXOFF|IXANY|IMAXBEL) 88#define TTYSUP_OFLAG (OPOST|ONLCR|TAB3|ONOEOT|OCRNL|ONOCR|ONLRET) 89#define TTYSUP_LFLAG (ECHOKE|ECHOE|ECHOK|ECHO|ECHONL|ECHOPRT|\ 90 ECHOCTL|ISIG|ICANON|ALTWERASE|IEXTEN|TOSTOP|\ 91 FLUSHO|NOKERNINFO|NOFLSH) 92#define TTYSUP_CFLAG (CIGNORE|CSIZE|CSTOPB|CREAD|PARENB|PARODD|\ 93 HUPCL|CLOCAL|CCTS_OFLOW|CRTS_IFLOW|CDTR_IFLOW|\ 94 CDSR_OFLOW|CCAR_OFLOW) 95 96#define TTY_CALLOUT(tp,d) (dev2unit(d) & TTYUNIT_CALLOUT) 97 98/* 99 * Set TTY buffer sizes. 100 */ 101 102#define TTYBUF_MAX 65536 103 104static void 105tty_watermarks(struct tty *tp) 106{ 107 size_t bs = 0; 108 109 /* Provide an input buffer for 0.2 seconds of data. */ 110 if (tp->t_termios.c_cflag & CREAD) 111 bs = MIN(tp->t_termios.c_ispeed / 5, TTYBUF_MAX); 112 ttyinq_setsize(&tp->t_inq, tp, bs); 113 114 /* Set low watermark at 10% (when 90% is available). */ 115 tp->t_inlow = (ttyinq_getallocatedsize(&tp->t_inq) * 9) / 10; 116 117 /* Provide an output buffer for 0.2 seconds of data. */ 118 bs = MIN(tp->t_termios.c_ospeed / 5, TTYBUF_MAX); 119 ttyoutq_setsize(&tp->t_outq, tp, bs); 120 121 /* Set low watermark at 10% (when 90% is available). */ 122 tp->t_outlow = (ttyoutq_getallocatedsize(&tp->t_outq) * 9) / 10; 123} 124 125static int 126tty_drain(struct tty *tp) 127{ 128 int error; 129 130 if (ttyhook_hashook(tp, getc_inject)) 131 /* buffer is inaccessible */ 132 return (0); 133 134 while (ttyoutq_bytesused(&tp->t_outq) > 0) { 135 ttydevsw_outwakeup(tp); 136 /* Could be handled synchronously. */ 137 if (ttyoutq_bytesused(&tp->t_outq) == 0) 138 return (0); 139 140 /* Wait for data to be drained. */ 141 error = tty_wait(tp, &tp->t_outwait); 142 if (error) 143 return (error); 144 } 145 146 return (0); 147} 148 149/* 150 * Though ttydev_enter() and ttydev_leave() seem to be related, they 151 * don't have to be used together. ttydev_enter() is used by the cdev 152 * operations to prevent an actual operation from being processed when 153 * the TTY has been abandoned. ttydev_leave() is used by ttydev_open() 154 * and ttydev_close() to determine whether per-TTY data should be 155 * deallocated. 156 */ 157 158static __inline int 159ttydev_enter(struct tty *tp) 160{ 161 tty_lock(tp); 162 163 if (tty_gone(tp) || !tty_opened(tp)) { 164 /* Device is already gone. */ 165 tty_unlock(tp); 166 return (ENXIO); 167 } 168 169 return (0); 170} 171 172static void 173ttydev_leave(struct tty *tp) 174{ 175 tty_lock_assert(tp, MA_OWNED); 176 177 if (tty_opened(tp) || tp->t_flags & TF_OPENCLOSE) { 178 /* Device is still opened somewhere. */ 179 tty_unlock(tp); 180 return; 181 } 182 183 tp->t_flags |= TF_OPENCLOSE; 184 185 /* Stop asynchronous I/O. */ 186 funsetown(&tp->t_sigio); 187 188 /* Remove console TTY. */ 189 if (constty == tp) 190 constty_clear(); 191 192 /* Drain any output. */ 193 MPASS((tp->t_flags & TF_STOPPED) == 0); 194 if (!tty_gone(tp)) { 195 while (tty_drain(tp) == ERESTART) 196 ; 197 } 198 199 ttydisc_close(tp); 200 201 /* Destroy associated buffers already. */ 202 ttyinq_free(&tp->t_inq); 203 tp->t_inlow = 0; 204 ttyoutq_free(&tp->t_outq); 205 tp->t_outlow = 0; 206 207 knlist_clear(&tp->t_inpoll.si_note, 1); 208 knlist_clear(&tp->t_outpoll.si_note, 1); 209 210 if (!tty_gone(tp)) 211 ttydevsw_close(tp); 212 213 tp->t_flags &= ~TF_OPENCLOSE; 214 cv_broadcast(&tp->t_dcdwait); 215 tty_rel_free(tp); 216} 217 218/* 219 * Operations that are exposed through the character device in /dev. 220 */ 221static int 222ttydev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 223{ 224 struct tty *tp; 225 int error = 0; 226 227 while ((tp = dev->si_drv1) == NULL) { 228 error = tsleep(&dev->si_drv1, PCATCH, "ttdrv1", 1); 229 if (error != EWOULDBLOCK) 230 return (error); 231 } 232 233 tty_lock(tp); 234 if (tty_gone(tp)) { 235 /* Device is already gone. */ 236 tty_unlock(tp); 237 return (ENXIO); 238 } 239 240 /* 241 * Block when other processes are currently opening or closing 242 * the TTY. 243 */ 244 while (tp->t_flags & TF_OPENCLOSE) { 245 error = tty_wait(tp, &tp->t_dcdwait); 246 if (error != 0) { 247 tty_unlock(tp); 248 return (error); 249 } 250 } 251 tp->t_flags |= TF_OPENCLOSE; 252 253 /* 254 * Make sure the "tty" and "cua" device cannot be opened at the 255 * same time. 256 */ 257 if (TTY_CALLOUT(tp, dev)) { 258 if (tp->t_flags & TF_OPENED_IN) { 259 error = EBUSY; 260 goto done; 261 } 262 } else { 263 if (tp->t_flags & TF_OPENED_OUT) { 264 error = EBUSY; 265 goto done; 266 } 267 } 268 269 if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) { 270 error = EBUSY; 271 goto done; 272 } 273 274 if (!tty_opened(tp)) { 275 /* Set proper termios flags. */ 276 if (TTY_CALLOUT(tp, dev)) 277 tp->t_termios = tp->t_termios_init_out; 278 else 279 tp->t_termios = tp->t_termios_init_in; 280 ttydevsw_param(tp, &tp->t_termios); 281 /* Prevent modem control on callout devices and /dev/console. */ 282 if (TTY_CALLOUT(tp, dev) || dev == dev_console) 283 tp->t_termios.c_cflag |= CLOCAL; 284 285 ttydevsw_modem(tp, SER_DTR|SER_RTS, 0); 286 287 error = ttydevsw_open(tp); 288 if (error != 0) 289 goto done; 290 291 ttydisc_open(tp); 292 tty_watermarks(tp); 293 } 294 295 /* Wait for Carrier Detect. */ 296 if ((oflags & O_NONBLOCK) == 0 && 297 (tp->t_termios.c_cflag & CLOCAL) == 0) { 298 while ((ttydevsw_modem(tp, 0, 0) & SER_DCD) == 0) { 299 error = tty_wait(tp, &tp->t_dcdwait); 300 if (error != 0) 301 goto done; 302 } 303 } 304 305 if (dev == dev_console) 306 tp->t_flags |= TF_OPENED_CONS; 307 else if (TTY_CALLOUT(tp, dev)) 308 tp->t_flags |= TF_OPENED_OUT; 309 else 310 tp->t_flags |= TF_OPENED_IN; 311 312done: tp->t_flags &= ~TF_OPENCLOSE; 313 cv_broadcast(&tp->t_dcdwait); 314 ttydev_leave(tp); 315 316 return (error); 317} 318 319static int 320ttydev_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 321{ 322 struct tty *tp = dev->si_drv1; 323 324 tty_lock(tp); 325 326 /* 327 * Don't actually close the device if it is being used as the 328 * console. 329 */ 330 MPASS((tp->t_flags & TF_OPENED) != TF_OPENED); 331 if (dev == dev_console) 332 tp->t_flags &= ~TF_OPENED_CONS; 333 else 334 tp->t_flags &= ~(TF_OPENED_IN|TF_OPENED_OUT); 335 336 if (tp->t_flags & TF_OPENED) { 337 tty_unlock(tp); 338 return (0); 339 } 340 341 /* 342 * This can only be called once. The callin and the callout 343 * devices cannot be opened at the same time. 344 */ 345 tp->t_flags &= ~(TF_EXCLUDE|TF_STOPPED); 346 347 /* Properly wake up threads that are stuck - revoke(). */ 348 tp->t_revokecnt++; 349 tty_wakeup(tp, FREAD|FWRITE); 350 cv_broadcast(&tp->t_bgwait); 351 cv_broadcast(&tp->t_dcdwait); 352 353 ttydev_leave(tp); 354 355 return (0); 356} 357 358static __inline int 359tty_is_ctty(struct tty *tp, struct proc *p) 360{ 361 tty_lock_assert(tp, MA_OWNED); 362 363 return (p->p_session == tp->t_session && p->p_flag & P_CONTROLT); 364} 365 366int 367tty_wait_background(struct tty *tp, struct thread *td, int sig) 368{ 369 struct proc *p = td->td_proc; 370 struct pgrp *pg; 371 ksiginfo_t ksi; 372 int error; 373 374 MPASS(sig == SIGTTIN || sig == SIGTTOU); 375 tty_lock_assert(tp, MA_OWNED); 376 377 for (;;) { 378 PROC_LOCK(p); 379 /* 380 * The process should only sleep, when: 381 * - This terminal is the controling terminal 382 * - Its process group is not the foreground process 383 * group 384 * - The parent process isn't waiting for the child to 385 * exit 386 * - the signal to send to the process isn't masked 387 */ 388 if (!tty_is_ctty(tp, p) || p->p_pgrp == tp->t_pgrp) { 389 /* Allow the action to happen. */ 390 PROC_UNLOCK(p); 391 return (0); 392 } 393 394 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, sig) || 395 SIGISMEMBER(td->td_sigmask, sig)) { 396 /* Only allow them in write()/ioctl(). */ 397 PROC_UNLOCK(p); 398 return (sig == SIGTTOU ? 0 : EIO); 399 } 400 401 pg = p->p_pgrp; 402 if (p->p_flag & P_PPWAIT || pg->pg_jobc == 0) { 403 /* Don't allow the action to happen. */ 404 PROC_UNLOCK(p); 405 return (EIO); 406 } 407 PROC_UNLOCK(p); 408 409 /* 410 * Send the signal and sleep until we're the new 411 * foreground process group. 412 */ 413 if (sig != 0) { 414 ksiginfo_init(&ksi); 415 ksi.ksi_code = SI_KERNEL; 416 ksi.ksi_signo = sig; 417 sig = 0; 418 } 419 PGRP_LOCK(pg); 420 pgsignal(pg, ksi.ksi_signo, 1, &ksi); 421 PGRP_UNLOCK(pg); 422 423 error = tty_wait(tp, &tp->t_bgwait); 424 if (error) 425 return (error); 426 } 427} 428 429static int 430ttydev_read(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 goto done; 438 error = ttydisc_read(tp, uio, ioflag); 439 tty_unlock(tp); 440 441 /* 442 * The read() call should not throw an error when the device is 443 * being destroyed. Silently convert it to an EOF. 444 */ 445done: if (error == ENXIO) 446 error = 0; 447 return (error); 448} 449 450static int 451ttydev_write(struct cdev *dev, struct uio *uio, int ioflag) 452{ 453 struct tty *tp = dev->si_drv1; 454 int error; 455 456 error = ttydev_enter(tp); 457 if (error) 458 return (error); 459 460 if (tp->t_termios.c_lflag & TOSTOP) { 461 error = tty_wait_background(tp, curthread, SIGTTOU); 462 if (error) 463 goto done; 464 } 465 466 if (ioflag & IO_NDELAY && tp->t_flags & TF_BUSY_OUT) { 467 /* Allow non-blocking writes to bypass serialization. */ 468 error = ttydisc_write(tp, uio, ioflag); 469 } else { 470 /* Serialize write() calls. */ 471 while (tp->t_flags & TF_BUSY_OUT) { 472 error = tty_wait(tp, &tp->t_outserwait); 473 if (error) 474 goto done; 475 } 476 477 tp->t_flags |= TF_BUSY_OUT; 478 error = ttydisc_write(tp, uio, ioflag); 479 tp->t_flags &= ~TF_BUSY_OUT; 480 cv_signal(&tp->t_outserwait); 481 } 482 483done: tty_unlock(tp); 484 return (error); 485} 486 487static int 488ttydev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 489 struct thread *td) 490{ 491 struct tty *tp = dev->si_drv1; 492 int error; 493 494 error = ttydev_enter(tp); 495 if (error) 496 return (error); 497 498 switch (cmd) { 499 case TIOCCBRK: 500 case TIOCCONS: 501 case TIOCDRAIN: 502 case TIOCEXCL: 503 case TIOCFLUSH: 504 case TIOCNXCL: 505 case TIOCSBRK: 506 case TIOCSCTTY: 507 case TIOCSETA: 508 case TIOCSETAF: 509 case TIOCSETAW: 510 case TIOCSPGRP: 511 case TIOCSTART: 512 case TIOCSTAT: 513 case TIOCSTI: 514 case TIOCSTOP: 515 case TIOCSWINSZ: 516#if 0 517 case TIOCSDRAINWAIT: 518 case TIOCSETD: 519#endif 520#ifdef COMPAT_43TTY 521 case TIOCLBIC: 522 case TIOCLBIS: 523 case TIOCLSET: 524 case TIOCSETC: 525 case OTIOCSETD: 526 case TIOCSETN: 527 case TIOCSETP: 528 case TIOCSLTC: 529#endif /* COMPAT_43TTY */ 530 /* 531 * If the ioctl() causes the TTY to be modified, let it 532 * wait in the background. 533 */ 534 error = tty_wait_background(tp, curthread, SIGTTOU); 535 if (error) 536 goto done; 537 } 538 539 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 540 struct termios *old = &tp->t_termios; 541 struct termios *new = (struct termios *)data; 542 struct termios *lock = TTY_CALLOUT(tp, dev) ? 543 &tp->t_termios_lock_out : &tp->t_termios_lock_in; 544 int cc; 545 546 /* 547 * Lock state devices. Just overwrite the values of the 548 * commands that are currently in use. 549 */ 550 new->c_iflag = (old->c_iflag & lock->c_iflag) | 551 (new->c_iflag & ~lock->c_iflag); 552 new->c_oflag = (old->c_oflag & lock->c_oflag) | 553 (new->c_oflag & ~lock->c_oflag); 554 new->c_cflag = (old->c_cflag & lock->c_cflag) | 555 (new->c_cflag & ~lock->c_cflag); 556 new->c_lflag = (old->c_lflag & lock->c_lflag) | 557 (new->c_lflag & ~lock->c_lflag); 558 for (cc = 0; cc < NCCS; ++cc) 559 if (lock->c_cc[cc]) 560 new->c_cc[cc] = old->c_cc[cc]; 561 if (lock->c_ispeed) 562 new->c_ispeed = old->c_ispeed; 563 if (lock->c_ospeed) 564 new->c_ospeed = old->c_ospeed; 565 } 566 567 error = tty_ioctl(tp, cmd, data, fflag, td); 568done: tty_unlock(tp); 569 570 return (error); 571} 572 573static int 574ttydev_poll(struct cdev *dev, int events, struct thread *td) 575{ 576 struct tty *tp = dev->si_drv1; 577 int error, revents = 0; 578 579 error = ttydev_enter(tp); 580 if (error) 581 return ((events & (POLLIN|POLLRDNORM)) | POLLHUP); 582 583 if (events & (POLLIN|POLLRDNORM)) { 584 /* See if we can read something. */ 585 if (ttydisc_read_poll(tp) > 0) 586 revents |= events & (POLLIN|POLLRDNORM); 587 } 588 589 if (tp->t_flags & TF_ZOMBIE) { 590 /* Hangup flag on zombie state. */ 591 revents |= POLLHUP; 592 } else if (events & (POLLOUT|POLLWRNORM)) { 593 /* See if we can write something. */ 594 if (ttydisc_write_poll(tp) > 0) 595 revents |= events & (POLLOUT|POLLWRNORM); 596 } 597 598 if (revents == 0) { 599 if (events & (POLLIN|POLLRDNORM)) 600 selrecord(td, &tp->t_inpoll); 601 if (events & (POLLOUT|POLLWRNORM)) 602 selrecord(td, &tp->t_outpoll); 603 } 604 605 tty_unlock(tp); 606 607 return (revents); 608} 609 610static int 611ttydev_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 612 int nprot, vm_memattr_t *memattr) 613{ 614 struct tty *tp = dev->si_drv1; 615 int error; 616 617 /* Handle mmap() through the driver. */ 618 619 error = ttydev_enter(tp); 620 if (error) 621 return (-1); 622 error = ttydevsw_mmap(tp, offset, paddr, nprot, memattr); 623 tty_unlock(tp); 624 625 return (error); 626} 627 628/* 629 * kqueue support. 630 */ 631 632static void 633tty_kqops_read_detach(struct knote *kn) 634{ 635 struct tty *tp = kn->kn_hook; 636 637 knlist_remove(&tp->t_inpoll.si_note, kn, 0); 638} 639 640static int 641tty_kqops_read_event(struct knote *kn, long hint) 642{ 643 struct tty *tp = kn->kn_hook; 644 645 tty_lock_assert(tp, MA_OWNED); 646 647 if (tty_gone(tp) || tp->t_flags & TF_ZOMBIE) { 648 kn->kn_flags |= EV_EOF; 649 return (1); 650 } else { 651 kn->kn_data = ttydisc_read_poll(tp); 652 return (kn->kn_data > 0); 653 } 654} 655 656static void 657tty_kqops_write_detach(struct knote *kn) 658{ 659 struct tty *tp = kn->kn_hook; 660 661 knlist_remove(&tp->t_outpoll.si_note, kn, 0); 662} 663 664static int 665tty_kqops_write_event(struct knote *kn, long hint) 666{ 667 struct tty *tp = kn->kn_hook; 668 669 tty_lock_assert(tp, MA_OWNED); 670 671 if (tty_gone(tp)) { 672 kn->kn_flags |= EV_EOF; 673 return (1); 674 } else { 675 kn->kn_data = ttydisc_write_poll(tp); 676 return (kn->kn_data > 0); 677 } 678} 679 680static struct filterops tty_kqops_read = { 681 .f_isfd = 1, 682 .f_detach = tty_kqops_read_detach, 683 .f_event = tty_kqops_read_event, 684}; 685static struct filterops tty_kqops_write = { 686 .f_isfd = 1, 687 .f_detach = tty_kqops_write_detach, 688 .f_event = tty_kqops_write_event, 689}; 690 691static int 692ttydev_kqfilter(struct cdev *dev, struct knote *kn) 693{ 694 struct tty *tp = dev->si_drv1; 695 int error; 696 697 error = ttydev_enter(tp); 698 if (error) 699 return (error); 700 701 switch (kn->kn_filter) { 702 case EVFILT_READ: 703 kn->kn_hook = tp; 704 kn->kn_fop = &tty_kqops_read; 705 knlist_add(&tp->t_inpoll.si_note, kn, 1); 706 break; 707 case EVFILT_WRITE: 708 kn->kn_hook = tp; 709 kn->kn_fop = &tty_kqops_write; 710 knlist_add(&tp->t_outpoll.si_note, kn, 1); 711 break; 712 default: 713 error = EINVAL; 714 break; 715 } 716 717 tty_unlock(tp); 718 return (error); 719} 720 721static struct cdevsw ttydev_cdevsw = { 722 .d_version = D_VERSION, 723 .d_open = ttydev_open, 724 .d_close = ttydev_close, 725 .d_read = ttydev_read, 726 .d_write = ttydev_write, 727 .d_ioctl = ttydev_ioctl, 728 .d_kqfilter = ttydev_kqfilter, 729 .d_poll = ttydev_poll, 730 .d_mmap = ttydev_mmap, 731 .d_name = "ttydev", 732 .d_flags = D_TTY, 733}; 734 735/* 736 * Init/lock-state devices 737 */ 738 739static int 740ttyil_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 741{ 742 struct tty *tp; 743 int error = 0; 744 745 while ((tp = dev->si_drv1) == NULL) { 746 error = tsleep(&dev->si_drv1, PCATCH, "ttdrv1", 1); 747 if (error != EWOULDBLOCK) 748 return (error); 749 } 750 tty_lock(tp); 751 if (tty_gone(tp)) 752 error = ENODEV; 753 tty_unlock(tp); 754 755 return (error); 756} 757 758static int 759ttyil_close(struct cdev *dev, int flag, int mode, struct thread *td) 760{ 761 return (0); 762} 763 764static int 765ttyil_rdwr(struct cdev *dev, struct uio *uio, int ioflag) 766{ 767 return (ENODEV); 768} 769 770static int 771ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 772 struct thread *td) 773{ 774 struct tty *tp = dev->si_drv1; 775 int error; 776 777 tty_lock(tp); 778 if (tty_gone(tp)) { 779 error = ENODEV; 780 goto done; 781 } 782 783 error = ttydevsw_cioctl(tp, dev2unit(dev), cmd, data, td); 784 if (error != ENOIOCTL) 785 goto done; 786 error = 0; 787 788 switch (cmd) { 789 case TIOCGETA: 790 /* Obtain terminal flags through tcgetattr(). */ 791 *(struct termios*)data = *(struct termios*)dev->si_drv2; 792 break; 793 case TIOCSETA: 794 /* Set terminal flags through tcsetattr(). */ 795 error = priv_check(td, PRIV_TTY_SETA); 796 if (error) 797 break; 798 *(struct termios*)dev->si_drv2 = *(struct termios*)data; 799 break; 800 case TIOCGETD: 801 *(int *)data = TTYDISC; 802 break; 803 case TIOCGWINSZ: 804 bzero(data, sizeof(struct winsize)); 805 break; 806 default: 807 error = ENOTTY; 808 } 809 810done: tty_unlock(tp); 811 return (error); 812} 813 814static struct cdevsw ttyil_cdevsw = { 815 .d_version = D_VERSION, 816 .d_open = ttyil_open, 817 .d_close = ttyil_close, 818 .d_read = ttyil_rdwr, 819 .d_write = ttyil_rdwr, 820 .d_ioctl = ttyil_ioctl, 821 .d_name = "ttyil", 822 .d_flags = D_TTY, 823}; 824 825static void 826tty_init_termios(struct tty *tp) 827{ 828 struct termios *t = &tp->t_termios_init_in; 829 830 t->c_cflag = TTYDEF_CFLAG; 831 t->c_iflag = TTYDEF_IFLAG; 832 t->c_lflag = TTYDEF_LFLAG; 833 t->c_oflag = TTYDEF_OFLAG; 834 t->c_ispeed = TTYDEF_SPEED; 835 t->c_ospeed = TTYDEF_SPEED; 836 memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars); 837 838 tp->t_termios_init_out = *t; 839} 840 841void 842tty_init_console(struct tty *tp, speed_t s) 843{ 844 struct termios *ti = &tp->t_termios_init_in; 845 struct termios *to = &tp->t_termios_init_out; 846 847 if (s != 0) { 848 ti->c_ispeed = ti->c_ospeed = s; 849 to->c_ispeed = to->c_ospeed = s; 850 } 851 852 ti->c_cflag |= CLOCAL; 853 to->c_cflag |= CLOCAL; 854} 855 856/* 857 * Standard device routine implementations, mostly meant for 858 * pseudo-terminal device drivers. When a driver creates a new terminal 859 * device class, missing routines are patched. 860 */ 861 862static int 863ttydevsw_defopen(struct tty *tp) 864{ 865 866 return (0); 867} 868 869static void 870ttydevsw_defclose(struct tty *tp) 871{ 872} 873 874static void 875ttydevsw_defoutwakeup(struct tty *tp) 876{ 877 878 panic("Terminal device has output, while not implemented"); 879} 880 881static void 882ttydevsw_definwakeup(struct tty *tp) 883{ 884} 885 886static int 887ttydevsw_defioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td) 888{ 889 890 return (ENOIOCTL); 891} 892 893static int 894ttydevsw_defcioctl(struct tty *tp, int unit, u_long cmd, caddr_t data, struct thread *td) 895{ 896 897 return (ENOIOCTL); 898} 899 900static int 901ttydevsw_defparam(struct tty *tp, struct termios *t) 902{ 903 904 /* 905 * Allow the baud rate to be adjusted for pseudo-devices, but at 906 * least restrict it to 115200 to prevent excessive buffer 907 * usage. Also disallow 0, to prevent foot shooting. 908 */ 909 if (t->c_ispeed < B50) 910 t->c_ispeed = B50; 911 else if (t->c_ispeed > B115200) 912 t->c_ispeed = B115200; 913 if (t->c_ospeed < B50) 914 t->c_ospeed = B50; 915 else if (t->c_ospeed > B115200) 916 t->c_ospeed = B115200; 917 t->c_cflag |= CREAD; 918 919 return (0); 920} 921 922static int 923ttydevsw_defmodem(struct tty *tp, int sigon, int sigoff) 924{ 925 926 /* Simulate a carrier to make the TTY layer happy. */ 927 return (SER_DCD); 928} 929 930static int 931ttydevsw_defmmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t *paddr, 932 int nprot, vm_memattr_t *memattr) 933{ 934 935 return (-1); 936} 937 938static void 939ttydevsw_defpktnotify(struct tty *tp, char event) 940{ 941} 942 943static void 944ttydevsw_deffree(void *softc) 945{ 946 947 panic("Terminal device freed without a free-handler"); 948} 949 950/* 951 * TTY allocation and deallocation. TTY devices can be deallocated when 952 * the driver doesn't use it anymore, when the TTY isn't a session's 953 * controlling TTY and when the device node isn't opened through devfs. 954 */ 955 956struct tty * 957tty_alloc(struct ttydevsw *tsw, void *sc) 958{ 959 960 return (tty_alloc_mutex(tsw, sc, NULL)); 961} 962 963struct tty * 964tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex) 965{ 966 struct tty *tp; 967 968 /* Make sure the driver defines all routines. */ 969#define PATCH_FUNC(x) do { \ 970 if (tsw->tsw_ ## x == NULL) \ 971 tsw->tsw_ ## x = ttydevsw_def ## x; \ 972} while (0) 973 PATCH_FUNC(open); 974 PATCH_FUNC(close); 975 PATCH_FUNC(outwakeup); 976 PATCH_FUNC(inwakeup); 977 PATCH_FUNC(ioctl); 978 PATCH_FUNC(cioctl); 979 PATCH_FUNC(param); 980 PATCH_FUNC(modem); 981 PATCH_FUNC(mmap); 982 PATCH_FUNC(pktnotify); 983 PATCH_FUNC(free); 984#undef PATCH_FUNC 985 986 tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO); 987 tp->t_devsw = tsw; 988 tp->t_devswsoftc = sc; 989 tp->t_flags = tsw->tsw_flags; 990 991 tty_init_termios(tp); 992 993 cv_init(&tp->t_inwait, "ttyin"); 994 cv_init(&tp->t_outwait, "ttyout"); 995 cv_init(&tp->t_outserwait, "ttyosr"); 996 cv_init(&tp->t_bgwait, "ttybg"); 997 cv_init(&tp->t_dcdwait, "ttydcd"); 998 999 /* Allow drivers to use a custom mutex to lock the TTY. */ 1000 if (mutex != NULL) { 1001 tp->t_mtx = mutex; 1002 } else { 1003 tp->t_mtx = &tp->t_mtxobj; 1004 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF); 1005 } 1006 1007 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx); 1008 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx); 1009 1010 sx_xlock(&tty_list_sx); 1011 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 1012 tty_list_count++; 1013 sx_xunlock(&tty_list_sx); 1014 1015 return (tp); 1016} 1017 1018static void 1019tty_dealloc(void *arg) 1020{ 1021 struct tty *tp = arg; 1022 1023 sx_xlock(&tty_list_sx); 1024 TAILQ_REMOVE(&tty_list, tp, t_list); 1025 tty_list_count--; 1026 sx_xunlock(&tty_list_sx); 1027 1028 /* Make sure we haven't leaked buffers. */ 1029 MPASS(ttyinq_getsize(&tp->t_inq) == 0); 1030 MPASS(ttyoutq_getsize(&tp->t_outq) == 0); 1031 1032 seldrain(&tp->t_inpoll); 1033 seldrain(&tp->t_outpoll); 1034 knlist_destroy(&tp->t_inpoll.si_note); 1035 knlist_destroy(&tp->t_outpoll.si_note); 1036 1037 cv_destroy(&tp->t_inwait); 1038 cv_destroy(&tp->t_outwait); 1039 cv_destroy(&tp->t_bgwait); 1040 cv_destroy(&tp->t_dcdwait); 1041 cv_destroy(&tp->t_outserwait); 1042 1043 if (tp->t_mtx == &tp->t_mtxobj) 1044 mtx_destroy(&tp->t_mtxobj); 1045 ttydevsw_free(tp); 1046 free(tp, M_TTY); 1047} 1048 1049static void 1050tty_rel_free(struct tty *tp) 1051{ 1052 struct cdev *dev; 1053 1054 tty_lock_assert(tp, MA_OWNED); 1055 1056#define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE) 1057 if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) { 1058 /* TTY is still in use. */ 1059 tty_unlock(tp); 1060 return; 1061 } 1062 1063 /* TTY can be deallocated. */ 1064 dev = tp->t_dev; 1065 tp->t_dev = NULL; 1066 tty_unlock(tp); 1067 1068 if (dev != NULL) 1069 destroy_dev_sched_cb(dev, tty_dealloc, tp); 1070} 1071 1072void 1073tty_rel_pgrp(struct tty *tp, struct pgrp *pg) 1074{ 1075 MPASS(tp->t_sessioncnt > 0); 1076 tty_lock_assert(tp, MA_OWNED); 1077 1078 if (tp->t_pgrp == pg) 1079 tp->t_pgrp = NULL; 1080 1081 tty_unlock(tp); 1082} 1083 1084void 1085tty_rel_sess(struct tty *tp, struct session *sess) 1086{ 1087 MPASS(tp->t_sessioncnt > 0); 1088 1089 /* Current session has left. */ 1090 if (tp->t_session == sess) { 1091 tp->t_session = NULL; 1092 MPASS(tp->t_pgrp == NULL); 1093 } 1094 tp->t_sessioncnt--; 1095 tty_rel_free(tp); 1096} 1097 1098void 1099tty_rel_gone(struct tty *tp) 1100{ 1101 MPASS(!tty_gone(tp)); 1102 1103 /* Simulate carrier removal. */ 1104 ttydisc_modem(tp, 0); 1105 1106 /* Wake up all blocked threads. */ 1107 tty_wakeup(tp, FREAD|FWRITE); 1108 cv_broadcast(&tp->t_bgwait); 1109 cv_broadcast(&tp->t_dcdwait); 1110 1111 tp->t_flags |= TF_GONE; 1112 tty_rel_free(tp); 1113} 1114 1115/* 1116 * Exposing information about current TTY's through sysctl 1117 */ 1118 1119static void 1120tty_to_xtty(struct tty *tp, struct xtty *xt) 1121{ 1122 tty_lock_assert(tp, MA_OWNED); 1123 1124 xt->xt_size = sizeof(struct xtty); 1125 xt->xt_insize = ttyinq_getsize(&tp->t_inq); 1126 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq); 1127 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq); 1128 xt->xt_inlow = tp->t_inlow; 1129 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq); 1130 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq); 1131 xt->xt_outlow = tp->t_outlow; 1132 xt->xt_column = tp->t_column; 1133 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1134 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0; 1135 xt->xt_flags = tp->t_flags; 1136 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV; 1137} 1138 1139static int 1140sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 1141{ 1142 unsigned long lsize; 1143 struct xtty *xtlist, *xt; 1144 struct tty *tp; 1145 int error; 1146 1147 sx_slock(&tty_list_sx); 1148 lsize = tty_list_count * sizeof(struct xtty); 1149 if (lsize == 0) { 1150 sx_sunlock(&tty_list_sx); 1151 return (0); 1152 } 1153 1154 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK); 1155 1156 TAILQ_FOREACH(tp, &tty_list, t_list) { 1157 tty_lock(tp); 1158 tty_to_xtty(tp, xt); 1159 tty_unlock(tp); 1160 xt++; 1161 } 1162 sx_sunlock(&tty_list_sx); 1163 1164 error = SYSCTL_OUT(req, xtlist, lsize); 1165 free(xtlist, M_TTY); 1166 return (error); 1167} 1168 1169SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 1170 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs"); 1171 1172/* 1173 * Device node creation. Device has been set up, now we can expose it to 1174 * the user. 1175 */ 1176 1177void 1178tty_makedev(struct tty *tp, struct ucred *cred, const char *fmt, ...) 1179{ 1180 va_list ap; 1181 struct cdev *dev; 1182 const char *prefix = "tty"; 1183 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */ 1184 uid_t uid; 1185 gid_t gid; 1186 mode_t mode; 1187 1188 /* Remove "tty" prefix from devices like PTY's. */ 1189 if (tp->t_flags & TF_NOPREFIX) 1190 prefix = ""; 1191 1192 va_start(ap, fmt); 1193 vsnrprintf(name, sizeof name, 32, fmt, ap); 1194 va_end(ap); 1195 1196 if (cred == NULL) { 1197 /* System device. */ 1198 uid = UID_ROOT; 1199 gid = GID_WHEEL; 1200 mode = S_IRUSR|S_IWUSR; 1201 } else { 1202 /* User device. */ 1203 uid = cred->cr_ruid; 1204 gid = GID_TTY; 1205 mode = S_IRUSR|S_IWUSR|S_IWGRP; 1206 } 1207 1208 /* Master call-in device. */ 1209 dev = make_dev_cred(&ttydev_cdevsw, 0, cred, 1210 uid, gid, mode, "%s%s", prefix, name); 1211 dev->si_drv1 = tp; 1212 wakeup(&dev->si_drv1); 1213 tp->t_dev = dev; 1214 1215 /* Slave call-in devices. */ 1216 if (tp->t_flags & TF_INITLOCK) { 1217 dev = make_dev_cred(&ttyil_cdevsw, TTYUNIT_INIT, cred, 1218 uid, gid, mode, "%s%s.init", prefix, name); 1219 dev_depends(tp->t_dev, dev); 1220 dev->si_drv1 = tp; 1221 wakeup(&dev->si_drv1); 1222 dev->si_drv2 = &tp->t_termios_init_in; 1223 1224 dev = make_dev_cred(&ttyil_cdevsw, TTYUNIT_LOCK, cred, 1225 uid, gid, mode, "%s%s.lock", prefix, name); 1226 dev_depends(tp->t_dev, dev); 1227 dev->si_drv1 = tp; 1228 wakeup(&dev->si_drv1); 1229 dev->si_drv2 = &tp->t_termios_lock_in; 1230 } 1231 1232 /* Call-out devices. */ 1233 if (tp->t_flags & TF_CALLOUT) { 1234 dev = make_dev_cred(&ttydev_cdevsw, TTYUNIT_CALLOUT, cred, 1235 UID_UUCP, GID_DIALER, 0660, "cua%s", name); 1236 dev_depends(tp->t_dev, dev); 1237 dev->si_drv1 = tp; 1238 wakeup(&dev->si_drv1); 1239 1240 /* Slave call-out devices. */ 1241 if (tp->t_flags & TF_INITLOCK) { 1242 dev = make_dev_cred(&ttyil_cdevsw, 1243 TTYUNIT_CALLOUT | TTYUNIT_INIT, cred, 1244 UID_UUCP, GID_DIALER, 0660, "cua%s.init", name); 1245 dev_depends(tp->t_dev, dev); 1246 dev->si_drv1 = tp; 1247 wakeup(&dev->si_drv1); 1248 dev->si_drv2 = &tp->t_termios_init_out; 1249 1250 dev = make_dev_cred(&ttyil_cdevsw, 1251 TTYUNIT_CALLOUT | TTYUNIT_LOCK, cred, 1252 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", name); 1253 dev_depends(tp->t_dev, dev); 1254 dev->si_drv1 = tp; 1255 wakeup(&dev->si_drv1); 1256 dev->si_drv2 = &tp->t_termios_lock_out; 1257 } 1258 } 1259} 1260 1261/* 1262 * Signalling processes. 1263 */ 1264 1265void 1266tty_signal_sessleader(struct tty *tp, int sig) 1267{ 1268 struct proc *p; 1269 1270 tty_lock_assert(tp, MA_OWNED); 1271 MPASS(sig >= 1 && sig < NSIG); 1272 1273 /* Make signals start output again. */ 1274 tp->t_flags &= ~TF_STOPPED; 1275 1276 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) { 1277 p = tp->t_session->s_leader; 1278 PROC_LOCK(p); 1279 kern_psignal(p, sig); 1280 PROC_UNLOCK(p); 1281 } 1282} 1283 1284void 1285tty_signal_pgrp(struct tty *tp, int sig) 1286{ 1287 ksiginfo_t ksi; 1288 1289 tty_lock_assert(tp, MA_OWNED); 1290 MPASS(sig >= 1 && sig < NSIG); 1291 1292 /* Make signals start output again. */ 1293 tp->t_flags &= ~TF_STOPPED; 1294 1295 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO)) 1296 tty_info(tp); 1297 if (tp->t_pgrp != NULL) { 1298 ksiginfo_init(&ksi); 1299 ksi.ksi_signo = sig; 1300 ksi.ksi_code = SI_KERNEL; 1301 PGRP_LOCK(tp->t_pgrp); 1302 pgsignal(tp->t_pgrp, sig, 1, &ksi); 1303 PGRP_UNLOCK(tp->t_pgrp); 1304 } 1305} 1306 1307void 1308tty_wakeup(struct tty *tp, int flags) 1309{ 1310 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL) 1311 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 1312 1313 if (flags & FWRITE) { 1314 cv_broadcast(&tp->t_outwait); 1315 selwakeup(&tp->t_outpoll); 1316 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0); 1317 } 1318 if (flags & FREAD) { 1319 cv_broadcast(&tp->t_inwait); 1320 selwakeup(&tp->t_inpoll); 1321 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0); 1322 } 1323} 1324 1325int 1326tty_wait(struct tty *tp, struct cv *cv) 1327{ 1328 int error; 1329 int revokecnt = tp->t_revokecnt; 1330 1331 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1332 MPASS(!tty_gone(tp)); 1333 1334 error = cv_wait_sig(cv, tp->t_mtx); 1335 1336 /* Restart the system call when we may have been revoked. */ 1337 if (tp->t_revokecnt != revokecnt) 1338 return (ERESTART); 1339 1340 /* Bail out when the device slipped away. */ 1341 if (tty_gone(tp)) 1342 return (ENXIO); 1343 1344 return (error); 1345} 1346 1347int 1348tty_timedwait(struct tty *tp, struct cv *cv, int hz) 1349{ 1350 int error; 1351 int revokecnt = tp->t_revokecnt; 1352 1353 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1354 MPASS(!tty_gone(tp)); 1355 1356 error = cv_timedwait_sig(cv, tp->t_mtx, hz); 1357 1358 /* Restart the system call when we may have been revoked. */ 1359 if (tp->t_revokecnt != revokecnt) 1360 return (ERESTART); 1361 1362 /* Bail out when the device slipped away. */ 1363 if (tty_gone(tp)) 1364 return (ENXIO); 1365 1366 return (error); 1367} 1368 1369void 1370tty_flush(struct tty *tp, int flags) 1371{ 1372 if (flags & FWRITE) { 1373 tp->t_flags &= ~TF_HIWAT_OUT; 1374 ttyoutq_flush(&tp->t_outq); 1375 tty_wakeup(tp, FWRITE); 1376 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE); 1377 } 1378 if (flags & FREAD) { 1379 tty_hiwat_in_unblock(tp); 1380 ttyinq_flush(&tp->t_inq); 1381 ttydevsw_inwakeup(tp); 1382 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD); 1383 } 1384} 1385 1386void 1387tty_set_winsize(struct tty *tp, const struct winsize *wsz) 1388{ 1389 1390 if (memcmp(&tp->t_winsize, wsz, sizeof(*wsz)) == 0) 1391 return; 1392 tp->t_winsize = *wsz; 1393 tty_signal_pgrp(tp, SIGWINCH); 1394} 1395 1396static int 1397tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, 1398 struct thread *td) 1399{ 1400 int error; 1401 1402 switch (cmd) { 1403 /* 1404 * Modem commands. 1405 * The SER_* and TIOCM_* flags are the same, but one bit 1406 * shifted. I don't know why. 1407 */ 1408 case TIOCSDTR: 1409 ttydevsw_modem(tp, SER_DTR, 0); 1410 return (0); 1411 case TIOCCDTR: 1412 ttydevsw_modem(tp, 0, SER_DTR); 1413 return (0); 1414 case TIOCMSET: { 1415 int bits = *(int *)data; 1416 ttydevsw_modem(tp, 1417 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 1418 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1419 return (0); 1420 } 1421 case TIOCMBIS: { 1422 int bits = *(int *)data; 1423 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0); 1424 return (0); 1425 } 1426 case TIOCMBIC: { 1427 int bits = *(int *)data; 1428 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1429 return (0); 1430 } 1431 case TIOCMGET: 1432 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1); 1433 return (0); 1434 1435 case FIOASYNC: 1436 if (*(int *)data) 1437 tp->t_flags |= TF_ASYNC; 1438 else 1439 tp->t_flags &= ~TF_ASYNC; 1440 return (0); 1441 case FIONBIO: 1442 /* This device supports non-blocking operation. */ 1443 return (0); 1444 case FIONREAD: 1445 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq); 1446 return (0); 1447 case FIONWRITE: 1448 case TIOCOUTQ: 1449 *(int *)data = ttyoutq_bytesused(&tp->t_outq); 1450 return (0); 1451 case FIOSETOWN: 1452 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1453 /* Not allowed to set ownership. */ 1454 return (ENOTTY); 1455 1456 /* Temporarily unlock the TTY to set ownership. */ 1457 tty_unlock(tp); 1458 error = fsetown(*(int *)data, &tp->t_sigio); 1459 tty_lock(tp); 1460 return (error); 1461 case FIOGETOWN: 1462 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1463 /* Not allowed to set ownership. */ 1464 return (ENOTTY); 1465 1466 /* Get ownership. */ 1467 *(int *)data = fgetown(&tp->t_sigio); 1468 return (0); 1469 case TIOCGETA: 1470 /* Obtain terminal flags through tcgetattr(). */ 1471 *(struct termios*)data = tp->t_termios; 1472 return (0); 1473 case TIOCSETA: 1474 case TIOCSETAW: 1475 case TIOCSETAF: { 1476 struct termios *t = data; 1477 1478 /* 1479 * Who makes up these funny rules? According to POSIX, 1480 * input baud rate is set equal to the output baud rate 1481 * when zero. 1482 */ 1483 if (t->c_ispeed == 0) 1484 t->c_ispeed = t->c_ospeed; 1485 1486 /* Discard any unsupported bits. */ 1487 t->c_iflag &= TTYSUP_IFLAG; 1488 t->c_oflag &= TTYSUP_OFLAG; 1489 t->c_lflag &= TTYSUP_LFLAG; 1490 t->c_cflag &= TTYSUP_CFLAG; 1491 1492 /* Set terminal flags through tcsetattr(). */ 1493 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1494 error = tty_drain(tp); 1495 if (error) 1496 return (error); 1497 if (cmd == TIOCSETAF) 1498 tty_flush(tp, FREAD); 1499 } 1500 1501 /* 1502 * Only call param() when the flags really change. 1503 */ 1504 if ((t->c_cflag & CIGNORE) == 0 && 1505 (tp->t_termios.c_cflag != t->c_cflag || 1506 ((tp->t_termios.c_iflag ^ t->c_iflag) & 1507 (IXON|IXOFF|IXANY)) || 1508 tp->t_termios.c_ispeed != t->c_ispeed || 1509 tp->t_termios.c_ospeed != t->c_ospeed)) { 1510 error = ttydevsw_param(tp, t); 1511 if (error) 1512 return (error); 1513 1514 /* XXX: CLOCAL? */ 1515 1516 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE; 1517 tp->t_termios.c_ispeed = t->c_ispeed; 1518 tp->t_termios.c_ospeed = t->c_ospeed; 1519 1520 /* Baud rate has changed - update watermarks. */ 1521 tty_watermarks(tp); 1522 } 1523 1524 /* Copy new non-device driver parameters. */ 1525 tp->t_termios.c_iflag = t->c_iflag; 1526 tp->t_termios.c_oflag = t->c_oflag; 1527 tp->t_termios.c_lflag = t->c_lflag; 1528 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc); 1529 1530 ttydisc_optimize(tp); 1531 1532 if ((t->c_lflag & ICANON) == 0) { 1533 /* 1534 * When in non-canonical mode, wake up all 1535 * readers. Canonicalize any partial input. VMIN 1536 * and VTIME could also be adjusted. 1537 */ 1538 ttyinq_canonicalize(&tp->t_inq); 1539 tty_wakeup(tp, FREAD); 1540 } 1541 1542 /* 1543 * For packet mode: notify the PTY consumer that VSTOP 1544 * and VSTART may have been changed. 1545 */ 1546 if (tp->t_termios.c_iflag & IXON && 1547 tp->t_termios.c_cc[VSTOP] == CTRL('S') && 1548 tp->t_termios.c_cc[VSTART] == CTRL('Q')) 1549 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP); 1550 else 1551 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP); 1552 return (0); 1553 } 1554 case TIOCGETD: 1555 /* For compatibility - we only support TTYDISC. */ 1556 *(int *)data = TTYDISC; 1557 return (0); 1558 case TIOCGPGRP: 1559 if (!tty_is_ctty(tp, td->td_proc)) 1560 return (ENOTTY); 1561 1562 if (tp->t_pgrp != NULL) 1563 *(int *)data = tp->t_pgrp->pg_id; 1564 else 1565 *(int *)data = NO_PID; 1566 return (0); 1567 case TIOCGSID: 1568 if (!tty_is_ctty(tp, td->td_proc)) 1569 return (ENOTTY); 1570 1571 MPASS(tp->t_session); 1572 *(int *)data = tp->t_session->s_sid; 1573 return (0); 1574 case TIOCSCTTY: { 1575 struct proc *p = td->td_proc; 1576 1577 /* XXX: This looks awful. */ 1578 tty_unlock(tp); 1579 sx_xlock(&proctree_lock); 1580 tty_lock(tp); 1581 1582 if (!SESS_LEADER(p)) { 1583 /* Only the session leader may do this. */ 1584 sx_xunlock(&proctree_lock); 1585 return (EPERM); 1586 } 1587 1588 if (tp->t_session != NULL && tp->t_session == p->p_session) { 1589 /* This is already our controlling TTY. */ 1590 sx_xunlock(&proctree_lock); 1591 return (0); 1592 } 1593 1594 if (p->p_session->s_ttyp != NULL || 1595 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL && 1596 tp->t_session->s_ttyvp->v_type != VBAD)) { 1597 /* 1598 * There is already a relation between a TTY and 1599 * a session, or the caller is not the session 1600 * leader. 1601 * 1602 * Allow the TTY to be stolen when the vnode is 1603 * invalid, but the reference to the TTY is 1604 * still active. This allows immediate reuse of 1605 * TTYs of which the session leader has been 1606 * killed or the TTY revoked. 1607 */ 1608 sx_xunlock(&proctree_lock); 1609 return (EPERM); 1610 } 1611 1612 /* Connect the session to the TTY. */ 1613 tp->t_session = p->p_session; 1614 tp->t_session->s_ttyp = tp; 1615 tp->t_sessioncnt++; 1616 sx_xunlock(&proctree_lock); 1617 1618 /* Assign foreground process group. */ 1619 tp->t_pgrp = p->p_pgrp; 1620 PROC_LOCK(p); 1621 p->p_flag |= P_CONTROLT; 1622 PROC_UNLOCK(p); 1623 1624 return (0); 1625 } 1626 case TIOCSPGRP: { 1627 struct pgrp *pg; 1628 1629 /* 1630 * XXX: Temporarily unlock the TTY to locate the process 1631 * group. This code would be lot nicer if we would ever 1632 * decompose proctree_lock. 1633 */ 1634 tty_unlock(tp); 1635 sx_slock(&proctree_lock); 1636 pg = pgfind(*(int *)data); 1637 if (pg != NULL) 1638 PGRP_UNLOCK(pg); 1639 if (pg == NULL || pg->pg_session != td->td_proc->p_session) { 1640 sx_sunlock(&proctree_lock); 1641 tty_lock(tp); 1642 return (EPERM); 1643 } 1644 tty_lock(tp); 1645 1646 /* 1647 * Determine if this TTY is the controlling TTY after 1648 * relocking the TTY. 1649 */ 1650 if (!tty_is_ctty(tp, td->td_proc)) { 1651 sx_sunlock(&proctree_lock); 1652 return (ENOTTY); 1653 } 1654 tp->t_pgrp = pg; 1655 sx_sunlock(&proctree_lock); 1656 1657 /* Wake up the background process groups. */ 1658 cv_broadcast(&tp->t_bgwait); 1659 return (0); 1660 } 1661 case TIOCFLUSH: { 1662 int flags = *(int *)data; 1663 1664 if (flags == 0) 1665 flags = (FREAD|FWRITE); 1666 else 1667 flags &= (FREAD|FWRITE); 1668 tty_flush(tp, flags); 1669 return (0); 1670 } 1671 case TIOCDRAIN: 1672 /* Drain TTY output. */ 1673 return tty_drain(tp); 1674 case TIOCCONS: 1675 /* Set terminal as console TTY. */ 1676 if (*(int *)data) { 1677 error = priv_check(td, PRIV_TTY_CONSOLE); 1678 if (error) 1679 return (error); 1680 1681 /* 1682 * XXX: constty should really need to be locked! 1683 * XXX: allow disconnected constty's to be stolen! 1684 */ 1685 1686 if (constty == tp) 1687 return (0); 1688 if (constty != NULL) 1689 return (EBUSY); 1690 1691 tty_unlock(tp); 1692 constty_set(tp); 1693 tty_lock(tp); 1694 } else if (constty == tp) { 1695 constty_clear(); 1696 } 1697 return (0); 1698 case TIOCGWINSZ: 1699 /* Obtain window size. */ 1700 *(struct winsize*)data = tp->t_winsize; 1701 return (0); 1702 case TIOCSWINSZ: 1703 /* Set window size. */ 1704 tty_set_winsize(tp, data); 1705 return (0); 1706 case TIOCEXCL: 1707 tp->t_flags |= TF_EXCLUDE; 1708 return (0); 1709 case TIOCNXCL: 1710 tp->t_flags &= ~TF_EXCLUDE; 1711 return (0); 1712 case TIOCSTOP: 1713 tp->t_flags |= TF_STOPPED; 1714 ttydevsw_pktnotify(tp, TIOCPKT_STOP); 1715 return (0); 1716 case TIOCSTART: 1717 tp->t_flags &= ~TF_STOPPED; 1718 ttydevsw_outwakeup(tp); 1719 ttydevsw_pktnotify(tp, TIOCPKT_START); 1720 return (0); 1721 case TIOCSTAT: 1722 tty_info(tp); 1723 return (0); 1724 case TIOCSTI: 1725 if ((fflag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI)) 1726 return (EPERM); 1727 if (!tty_is_ctty(tp, td->td_proc) && 1728 priv_check(td, PRIV_TTY_STI)) 1729 return (EACCES); 1730 ttydisc_rint(tp, *(char *)data, 0); 1731 ttydisc_rint_done(tp); 1732 return (0); 1733 } 1734 1735#ifdef COMPAT_43TTY 1736 return tty_ioctl_compat(tp, cmd, data, fflag, td); 1737#else /* !COMPAT_43TTY */ 1738 return (ENOIOCTL); 1739#endif /* COMPAT_43TTY */ 1740} 1741 1742int 1743tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, struct thread *td) 1744{ 1745 int error; 1746 1747 tty_lock_assert(tp, MA_OWNED); 1748 1749 if (tty_gone(tp)) 1750 return (ENXIO); 1751 1752 error = ttydevsw_ioctl(tp, cmd, data, td); 1753 if (error == ENOIOCTL) 1754 error = tty_generic_ioctl(tp, cmd, data, fflag, td); 1755 1756 return (error); 1757} 1758 1759dev_t 1760tty_udev(struct tty *tp) 1761{ 1762 if (tp->t_dev) 1763 return dev2udev(tp->t_dev); 1764 else 1765 return NODEV; 1766} 1767 1768int 1769tty_checkoutq(struct tty *tp) 1770{ 1771 1772 /* 256 bytes should be enough to print a log message. */ 1773 return (ttyoutq_bytesleft(&tp->t_outq) >= 256); 1774} 1775 1776void 1777tty_hiwat_in_block(struct tty *tp) 1778{ 1779 1780 if ((tp->t_flags & TF_HIWAT_IN) == 0 && 1781 tp->t_termios.c_iflag & IXOFF && 1782 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) { 1783 /* 1784 * Input flow control. Only enter the high watermark when we 1785 * can successfully store the VSTOP character. 1786 */ 1787 if (ttyoutq_write_nofrag(&tp->t_outq, 1788 &tp->t_termios.c_cc[VSTOP], 1) == 0) 1789 tp->t_flags |= TF_HIWAT_IN; 1790 } else { 1791 /* No input flow control. */ 1792 tp->t_flags |= TF_HIWAT_IN; 1793 } 1794} 1795 1796void 1797tty_hiwat_in_unblock(struct tty *tp) 1798{ 1799 1800 if (tp->t_flags & TF_HIWAT_IN && 1801 tp->t_termios.c_iflag & IXOFF && 1802 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) { 1803 /* 1804 * Input flow control. Only leave the high watermark when we 1805 * can successfully store the VSTART character. 1806 */ 1807 if (ttyoutq_write_nofrag(&tp->t_outq, 1808 &tp->t_termios.c_cc[VSTART], 1) == 0) 1809 tp->t_flags &= ~TF_HIWAT_IN; 1810 } else { 1811 /* No input flow control. */ 1812 tp->t_flags &= ~TF_HIWAT_IN; 1813 } 1814 1815 if (!tty_gone(tp)) 1816 ttydevsw_inwakeup(tp); 1817} 1818 1819/* 1820 * TTY hooks interface. 1821 */ 1822 1823static int 1824ttyhook_defrint(struct tty *tp, char c, int flags) 1825{ 1826 1827 if (ttyhook_rint_bypass(tp, &c, 1) != 1) 1828 return (-1); 1829 1830 return (0); 1831} 1832 1833int 1834ttyhook_register(struct tty **rtp, struct proc *p, int fd, 1835 struct ttyhook *th, void *softc) 1836{ 1837 struct tty *tp; 1838 struct file *fp; 1839 struct cdev *dev; 1840 struct cdevsw *cdp; 1841 struct filedesc *fdp; 1842 cap_rights_t rights; 1843 int error, ref; 1844 1845 /* Validate the file descriptor. */ 1846 fdp = p->p_fd; 1847 error = fget_unlocked(fdp, fd, cap_rights_init(&rights, CAP_TTYHOOK), 1848 0, &fp, NULL); 1849 if (error != 0) 1850 return (error); 1851 if (fp->f_ops == &badfileops) { 1852 error = EBADF; 1853 goto done1; 1854 } 1855 1856 /* 1857 * Make sure the vnode is bound to a character device. 1858 * Unlocked check for the vnode type is ok there, because we 1859 * only shall prevent calling devvn_refthread on the file that 1860 * never has been opened over a character device. 1861 */ 1862 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) { 1863 error = EINVAL; 1864 goto done1; 1865 } 1866 1867 /* Make sure it is a TTY. */ 1868 cdp = devvn_refthread(fp->f_vnode, &dev, &ref); 1869 if (cdp == NULL) { 1870 error = ENXIO; 1871 goto done1; 1872 } 1873 if (dev != fp->f_data) { 1874 error = ENXIO; 1875 goto done2; 1876 } 1877 if (cdp != &ttydev_cdevsw) { 1878 error = ENOTTY; 1879 goto done2; 1880 } 1881 tp = dev->si_drv1; 1882 1883 /* Try to attach the hook to the TTY. */ 1884 error = EBUSY; 1885 tty_lock(tp); 1886 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0)); 1887 if (tp->t_flags & TF_HOOK) 1888 goto done3; 1889 1890 tp->t_flags |= TF_HOOK; 1891 tp->t_hook = th; 1892 tp->t_hooksoftc = softc; 1893 *rtp = tp; 1894 error = 0; 1895 1896 /* Maybe we can switch into bypass mode now. */ 1897 ttydisc_optimize(tp); 1898 1899 /* Silently convert rint() calls to rint_bypass() when possible. */ 1900 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass)) 1901 th->th_rint = ttyhook_defrint; 1902 1903done3: tty_unlock(tp); 1904done2: dev_relthread(dev, ref); 1905done1: fdrop(fp, curthread); 1906 return (error); 1907} 1908 1909void 1910ttyhook_unregister(struct tty *tp) 1911{ 1912 1913 tty_lock_assert(tp, MA_OWNED); 1914 MPASS(tp->t_flags & TF_HOOK); 1915 1916 /* Disconnect the hook. */ 1917 tp->t_flags &= ~TF_HOOK; 1918 tp->t_hook = NULL; 1919 1920 /* Maybe we need to leave bypass mode. */ 1921 ttydisc_optimize(tp); 1922 1923 /* Maybe deallocate the TTY as well. */ 1924 tty_rel_free(tp); 1925} 1926 1927/* 1928 * /dev/console handling. 1929 */ 1930 1931static int 1932ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 1933{ 1934 struct tty *tp; 1935 1936 /* System has no console device. */ 1937 if (dev_console_filename == NULL) 1938 return (ENXIO); 1939 1940 /* Look up corresponding TTY by device name. */ 1941 sx_slock(&tty_list_sx); 1942 TAILQ_FOREACH(tp, &tty_list, t_list) { 1943 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) { 1944 dev_console->si_drv1 = tp; 1945 break; 1946 } 1947 } 1948 sx_sunlock(&tty_list_sx); 1949 1950 /* System console has no TTY associated. */ 1951 if (dev_console->si_drv1 == NULL) 1952 return (ENXIO); 1953 1954 return (ttydev_open(dev, oflags, devtype, td)); 1955} 1956 1957static int 1958ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag) 1959{ 1960 1961 log_console(uio); 1962 1963 return (ttydev_write(dev, uio, ioflag)); 1964} 1965 1966/* 1967 * /dev/console is a little different than normal TTY's. When opened, 1968 * it determines which TTY to use. When data gets written to it, it 1969 * will be logged in the kernel message buffer. 1970 */ 1971static struct cdevsw ttyconsdev_cdevsw = { 1972 .d_version = D_VERSION, 1973 .d_open = ttyconsdev_open, 1974 .d_close = ttydev_close, 1975 .d_read = ttydev_read, 1976 .d_write = ttyconsdev_write, 1977 .d_ioctl = ttydev_ioctl, 1978 .d_kqfilter = ttydev_kqfilter, 1979 .d_poll = ttydev_poll, 1980 .d_mmap = ttydev_mmap, 1981 .d_name = "ttyconsdev", 1982 .d_flags = D_TTY, 1983}; 1984 1985static void 1986ttyconsdev_init(void *unused) 1987{ 1988 1989 dev_console = make_dev_credf(MAKEDEV_ETERNAL, &ttyconsdev_cdevsw, 0, 1990 NULL, UID_ROOT, GID_WHEEL, 0600, "console"); 1991} 1992 1993SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL); 1994 1995void 1996ttyconsdev_select(const char *name) 1997{ 1998 1999 dev_console_filename = name; 2000} 2001 2002/* 2003 * Debugging routines. 2004 */ 2005 2006#include "opt_ddb.h" 2007#ifdef DDB 2008#include <ddb/ddb.h> 2009#include <ddb/db_sym.h> 2010 2011static struct { 2012 int flag; 2013 char val; 2014} ttystates[] = { 2015#if 0 2016 { TF_NOPREFIX, 'N' }, 2017#endif 2018 { TF_INITLOCK, 'I' }, 2019 { TF_CALLOUT, 'C' }, 2020 2021 /* Keep these together -> 'Oi' and 'Oo'. */ 2022 { TF_OPENED, 'O' }, 2023 { TF_OPENED_IN, 'i' }, 2024 { TF_OPENED_OUT, 'o' }, 2025 { TF_OPENED_CONS, 'c' }, 2026 2027 { TF_GONE, 'G' }, 2028 { TF_OPENCLOSE, 'B' }, 2029 { TF_ASYNC, 'Y' }, 2030 { TF_LITERAL, 'L' }, 2031 2032 /* Keep these together -> 'Hi' and 'Ho'. */ 2033 { TF_HIWAT, 'H' }, 2034 { TF_HIWAT_IN, 'i' }, 2035 { TF_HIWAT_OUT, 'o' }, 2036 2037 { TF_STOPPED, 'S' }, 2038 { TF_EXCLUDE, 'X' }, 2039 { TF_BYPASS, 'l' }, 2040 { TF_ZOMBIE, 'Z' }, 2041 { TF_HOOK, 's' }, 2042 2043 /* Keep these together -> 'bi' and 'bo'. */ 2044 { TF_BUSY, 'b' }, 2045 { TF_BUSY_IN, 'i' }, 2046 { TF_BUSY_OUT, 'o' }, 2047 2048 { 0, '\0'}, 2049}; 2050 2051#define TTY_FLAG_BITS \ 2052 "\20\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \ 2053 "\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \ 2054 "\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK" 2055 2056#define DB_PRINTSYM(name, addr) \ 2057 db_printf("%s " #name ": ", sep); \ 2058 db_printsym((db_addr_t) addr, DB_STGY_ANY); \ 2059 db_printf("\n"); 2060 2061static void 2062_db_show_devsw(const char *sep, const struct ttydevsw *tsw) 2063{ 2064 db_printf("%sdevsw: ", sep); 2065 db_printsym((db_addr_t)tsw, DB_STGY_ANY); 2066 db_printf(" (%p)\n", tsw); 2067 DB_PRINTSYM(open, tsw->tsw_open); 2068 DB_PRINTSYM(close, tsw->tsw_close); 2069 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup); 2070 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup); 2071 DB_PRINTSYM(ioctl, tsw->tsw_ioctl); 2072 DB_PRINTSYM(param, tsw->tsw_param); 2073 DB_PRINTSYM(modem, tsw->tsw_modem); 2074 DB_PRINTSYM(mmap, tsw->tsw_mmap); 2075 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify); 2076 DB_PRINTSYM(free, tsw->tsw_free); 2077} 2078static void 2079_db_show_hooks(const char *sep, const struct ttyhook *th) 2080{ 2081 db_printf("%shook: ", sep); 2082 db_printsym((db_addr_t)th, DB_STGY_ANY); 2083 db_printf(" (%p)\n", th); 2084 if (th == NULL) 2085 return; 2086 DB_PRINTSYM(rint, th->th_rint); 2087 DB_PRINTSYM(rint_bypass, th->th_rint_bypass); 2088 DB_PRINTSYM(rint_done, th->th_rint_done); 2089 DB_PRINTSYM(rint_poll, th->th_rint_poll); 2090 DB_PRINTSYM(getc_inject, th->th_getc_inject); 2091 DB_PRINTSYM(getc_capture, th->th_getc_capture); 2092 DB_PRINTSYM(getc_poll, th->th_getc_poll); 2093 DB_PRINTSYM(close, th->th_close); 2094} 2095 2096static void 2097_db_show_termios(const char *name, const struct termios *t) 2098{ 2099 2100 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x " 2101 "lflag 0x%x ispeed %u ospeed %u\n", name, 2102 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag, 2103 t->c_ispeed, t->c_ospeed); 2104} 2105 2106/* DDB command to show TTY statistics. */ 2107DB_SHOW_COMMAND(tty, db_show_tty) 2108{ 2109 struct tty *tp; 2110 2111 if (!have_addr) { 2112 db_printf("usage: show tty <addr>\n"); 2113 return; 2114 } 2115 tp = (struct tty *)addr; 2116 2117 db_printf("0x%p: %s\n", tp, tty_devname(tp)); 2118 db_printf("\tmtx: %p\n", tp->t_mtx); 2119 db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS); 2120 db_printf("\trevokecnt: %u\n", tp->t_revokecnt); 2121 2122 /* Buffering mechanisms. */ 2123 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u " 2124 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin, 2125 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end, 2126 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota); 2127 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n", 2128 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end, 2129 tp->t_outq.to_nblocks, tp->t_outq.to_quota); 2130 db_printf("\tinlow: %zu\n", tp->t_inlow); 2131 db_printf("\toutlow: %zu\n", tp->t_outlow); 2132 _db_show_termios("\ttermios", &tp->t_termios); 2133 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n", 2134 tp->t_winsize.ws_row, tp->t_winsize.ws_col, 2135 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel); 2136 db_printf("\tcolumn: %u\n", tp->t_column); 2137 db_printf("\twritepos: %u\n", tp->t_writepos); 2138 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags); 2139 2140 /* Init/lock-state devices. */ 2141 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in); 2142 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out); 2143 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in); 2144 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out); 2145 2146 /* Hooks */ 2147 _db_show_devsw("\t", tp->t_devsw); 2148 _db_show_hooks("\t", tp->t_hook); 2149 2150 /* Process info. */ 2151 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp, 2152 tp->t_pgrp ? tp->t_pgrp->pg_id : 0, 2153 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0); 2154 db_printf("\tsession: %p", tp->t_session); 2155 if (tp->t_session != NULL) 2156 db_printf(" count %u leader %p tty %p sid %d login %s", 2157 tp->t_session->s_count, tp->t_session->s_leader, 2158 tp->t_session->s_ttyp, tp->t_session->s_sid, 2159 tp->t_session->s_login); 2160 db_printf("\n"); 2161 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt); 2162 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc); 2163 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc); 2164 db_printf("\tdev: %p\n", tp->t_dev); 2165} 2166 2167/* DDB command to list TTYs. */ 2168DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys) 2169{ 2170 struct tty *tp; 2171 size_t isiz, osiz; 2172 int i, j; 2173 2174 /* Make the output look like `pstat -t'. */ 2175 db_printf("PTR "); 2176#if defined(__LP64__) 2177 db_printf(" "); 2178#endif 2179 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW " 2180 "COL SESS PGID STATE\n"); 2181 2182 TAILQ_FOREACH(tp, &tty_list, t_list) { 2183 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE; 2184 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE; 2185 2186 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ", 2187 tp, 2188 tty_devname(tp), 2189 isiz, 2190 tp->t_inq.ti_linestart - tp->t_inq.ti_begin, 2191 tp->t_inq.ti_end - tp->t_inq.ti_linestart, 2192 isiz - tp->t_inlow, 2193 osiz, 2194 tp->t_outq.to_end - tp->t_outq.to_begin, 2195 osiz - tp->t_outlow, 2196 MIN(tp->t_column, 99999), 2197 tp->t_session ? tp->t_session->s_sid : 0, 2198 tp->t_pgrp ? tp->t_pgrp->pg_id : 0); 2199 2200 /* Flag bits. */ 2201 for (i = j = 0; ttystates[i].flag; i++) 2202 if (tp->t_flags & ttystates[i].flag) { 2203 db_printf("%c", ttystates[i].val); 2204 j++; 2205 } 2206 if (j == 0) 2207 db_printf("-"); 2208 db_printf("\n"); 2209 } 2210} 2211#endif /* DDB */ 2212