Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/kern/tty.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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_capsicum.h" 34 #include "opt_compat.h" 35 36 #include <sys/param.h> 37 #include <sys/capsicum.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 70 static MALLOC_DEFINE(M_TTY, "tty", "tty device"); 71 72 static void tty_rel_free(struct tty *tp); 73 74 static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list); 75 static struct sx tty_list_sx; 76 SX_SYSINIT(tty_list, &tty_list_sx, "tty list"); 77 static unsigned int tty_list_count = 0; 78 79 /* Character device of /dev/console. */ 80 static struct cdev *dev_console; 81 static 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 static int tty_drainwait = 5 * 60; 99 SYSCTL_INT(_kern, OID_AUTO, tty_drainwait, CTLFLAG_RWTUN, 100 &tty_drainwait, 0, "Default output drain timeout in seconds"); 101 102 /* 103 * Set TTY buffer sizes. 104 */ 105 106 #define TTYBUF_MAX 65536 107 108 /* 109 * Allocate buffer space if necessary, and set low watermarks, based on speed. 110 * Note that the ttyxxxq_setsize() functions may drop and then reacquire the tty 111 * lock during memory allocation. They will return ENXIO if the tty disappears 112 * while unlocked. 113 */ 114 static int 115 tty_watermarks(struct tty *tp) 116 { 117 size_t bs = 0; 118 int error; 119 120 /* Provide an input buffer for 2 seconds of data. */ 121 if (tp->t_termios.c_cflag & CREAD) 122 bs = MIN(tp->t_termios.c_ispeed / 5, TTYBUF_MAX); 123 error = ttyinq_setsize(&tp->t_inq, tp, bs); 124 if (error != 0) 125 return (error); 126 127 /* Set low watermark at 10% (when 90% is available). */ 128 tp->t_inlow = (ttyinq_getallocatedsize(&tp->t_inq) * 9) / 10; 129 130 /* Provide an output buffer for 2 seconds of data. */ 131 bs = MIN(tp->t_termios.c_ospeed / 5, TTYBUF_MAX); 132 error = ttyoutq_setsize(&tp->t_outq, tp, bs); 133 if (error != 0) 134 return (error); 135 136 /* Set low watermark at 10% (when 90% is available). */ 137 tp->t_outlow = (ttyoutq_getallocatedsize(&tp->t_outq) * 9) / 10; 138 139 return (0); 140 } 141 142 static int 143 tty_drain(struct tty *tp, int leaving) 144 { 145 sbintime_t timeout_at; 146 size_t bytes; 147 int error; 148 149 if (ttyhook_hashook(tp, getc_inject)) 150 /* buffer is inaccessible */ 151 return (0); 152 153 /* 154 * For close(), use the recent historic timeout of "1 second without 155 * making progress". For tcdrain(), use t_drainwait as the timeout, 156 * with zero meaning "no timeout" which gives POSIX behavior. 157 */ 158 if (leaving) 159 timeout_at = getsbinuptime() + SBT_1S; 160 else if (tp->t_drainwait != 0) 161 timeout_at = getsbinuptime() + SBT_1S * tp->t_drainwait; 162 else 163 timeout_at = 0; 164 165 /* 166 * Poll the output buffer and the hardware for completion, at 10 Hz. 167 * Polling is required for devices which are not able to signal an 168 * interrupt when the transmitter becomes idle (most USB serial devs). 169 * The unusual structure of this loop ensures we check for busy one more 170 * time after tty_timedwait() returns EWOULDBLOCK, so that success has 171 * higher priority than timeout if the IO completed in the last 100mS. 172 */ 173 error = 0; 174 bytes = ttyoutq_bytesused(&tp->t_outq); 175 for (;;) { 176 if (ttyoutq_bytesused(&tp->t_outq) == 0 && !ttydevsw_busy(tp)) 177 return (0); 178 if (error != 0) 179 return (error); 180 ttydevsw_outwakeup(tp); 181 error = tty_timedwait(tp, &tp->t_outwait, hz / 10); 182 if (error != 0 && error != EWOULDBLOCK) 183 return (error); 184 else if (timeout_at == 0 || getsbinuptime() < timeout_at) 185 error = 0; 186 else if (leaving && ttyoutq_bytesused(&tp->t_outq) < bytes) { 187 /* In close, making progress, grant an extra second. */ 188 error = 0; 189 timeout_at += SBT_1S; 190 bytes = ttyoutq_bytesused(&tp->t_outq); 191 } 192 } 193 } 194 195 /* 196 * Though ttydev_enter() and ttydev_leave() seem to be related, they 197 * don't have to be used together. ttydev_enter() is used by the cdev 198 * operations to prevent an actual operation from being processed when 199 * the TTY has been abandoned. ttydev_leave() is used by ttydev_open() 200 * and ttydev_close() to determine whether per-TTY data should be 201 * deallocated. 202 */ 203 204 static __inline int 205 ttydev_enter(struct tty *tp) 206 { 207 208 tty_lock(tp); 209 210 if (tty_gone(tp) || !tty_opened(tp)) { 211 /* Device is already gone. */ 212 tty_unlock(tp); 213 return (ENXIO); 214 } 215 216 return (0); 217 } 218 219 static void 220 ttydev_leave(struct tty *tp) 221 { 222 223 tty_lock_assert(tp, MA_OWNED); 224 225 if (tty_opened(tp) || tp->t_flags & TF_OPENCLOSE) { 226 /* Device is still opened somewhere. */ 227 tty_unlock(tp); 228 return; 229 } 230 231 tp->t_flags |= TF_OPENCLOSE; 232 233 /* Remove console TTY. */ 234 if (constty == tp) 235 constty_clear(); 236 237 /* Drain any output. */ 238 if (!tty_gone(tp)) 239 tty_drain(tp, 1); 240 241 ttydisc_close(tp); 242 243 /* Free i/o queues now since they might be large. */ 244 ttyinq_free(&tp->t_inq); 245 tp->t_inlow = 0; 246 ttyoutq_free(&tp->t_outq); 247 tp->t_outlow = 0; 248 249 knlist_clear(&tp->t_inpoll.si_note, 1); 250 knlist_clear(&tp->t_outpoll.si_note, 1); 251 252 if (!tty_gone(tp)) 253 ttydevsw_close(tp); 254 255 tp->t_flags &= ~TF_OPENCLOSE; 256 cv_broadcast(&tp->t_dcdwait); 257 tty_rel_free(tp); 258 } 259 260 /* 261 * Operations that are exposed through the character device in /dev. 262 */ 263 static int 264 ttydev_open(struct cdev *dev, int oflags, int devtype __unused, 265 struct thread *td) 266 { 267 struct tty *tp; 268 int error; 269 270 tp = dev->si_drv1; 271 error = 0; 272 tty_lock(tp); 273 if (tty_gone(tp)) { 274 /* Device is already gone. */ 275 tty_unlock(tp); 276 return (ENXIO); 277 } 278 279 /* 280 * Block when other processes are currently opening or closing 281 * the TTY. 282 */ 283 while (tp->t_flags & TF_OPENCLOSE) { 284 error = tty_wait(tp, &tp->t_dcdwait); 285 if (error != 0) { 286 tty_unlock(tp); 287 return (error); 288 } 289 } 290 tp->t_flags |= TF_OPENCLOSE; 291 292 /* 293 * Make sure the "tty" and "cua" device cannot be opened at the 294 * same time. The console is a "tty" device. 295 */ 296 if (TTY_CALLOUT(tp, dev)) { 297 if (tp->t_flags & (TF_OPENED_CONS | TF_OPENED_IN)) { 298 error = EBUSY; 299 goto done; 300 } 301 } else { 302 if (tp->t_flags & TF_OPENED_OUT) { 303 error = EBUSY; 304 goto done; 305 } 306 } 307 308 if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) { 309 error = EBUSY; 310 goto done; 311 } 312 313 if (!tty_opened(tp)) { 314 /* Set proper termios flags. */ 315 if (TTY_CALLOUT(tp, dev)) 316 tp->t_termios = tp->t_termios_init_out; 317 else 318 tp->t_termios = tp->t_termios_init_in; 319 ttydevsw_param(tp, &tp->t_termios); 320 /* Prevent modem control on callout devices and /dev/console. */ 321 if (TTY_CALLOUT(tp, dev) || dev == dev_console) 322 tp->t_termios.c_cflag |= CLOCAL; 323 324 ttydevsw_modem(tp, SER_DTR|SER_RTS, 0); 325 326 error = ttydevsw_open(tp); 327 if (error != 0) 328 goto done; 329 330 ttydisc_open(tp); 331 error = tty_watermarks(tp); 332 if (error != 0) 333 goto done; 334 } 335 336 /* Wait for Carrier Detect. */ 337 if ((oflags & O_NONBLOCK) == 0 && 338 (tp->t_termios.c_cflag & CLOCAL) == 0) { 339 while ((ttydevsw_modem(tp, 0, 0) & SER_DCD) == 0) { 340 error = tty_wait(tp, &tp->t_dcdwait); 341 if (error != 0) 342 goto done; 343 } 344 } 345 346 if (dev == dev_console) 347 tp->t_flags |= TF_OPENED_CONS; 348 else if (TTY_CALLOUT(tp, dev)) 349 tp->t_flags |= TF_OPENED_OUT; 350 else 351 tp->t_flags |= TF_OPENED_IN; 352 MPASS((tp->t_flags & (TF_OPENED_CONS | TF_OPENED_IN)) == 0 || 353 (tp->t_flags & TF_OPENED_OUT) == 0); 354 355 done: tp->t_flags &= ~TF_OPENCLOSE; 356 cv_broadcast(&tp->t_dcdwait); 357 ttydev_leave(tp); 358 359 return (error); 360 } 361 362 static int 363 ttydev_close(struct cdev *dev, int fflag, int devtype __unused, 364 struct thread *td __unused) 365 { 366 struct tty *tp = dev->si_drv1; 367 368 tty_lock(tp); 369 370 /* 371 * Don't actually close the device if it is being used as the 372 * console. 373 */ 374 MPASS((tp->t_flags & (TF_OPENED_CONS | TF_OPENED_IN)) == 0 || 375 (tp->t_flags & TF_OPENED_OUT) == 0); 376 if (dev == dev_console) 377 tp->t_flags &= ~TF_OPENED_CONS; 378 else 379 tp->t_flags &= ~(TF_OPENED_IN|TF_OPENED_OUT); 380 381 if (tp->t_flags & TF_OPENED) { 382 tty_unlock(tp); 383 return (0); 384 } 385 386 /* If revoking, flush output now to avoid draining it later. */ 387 if (fflag & FREVOKE) 388 tty_flush(tp, FWRITE); 389 390 tp->t_flags &= ~TF_EXCLUDE; 391 392 /* Properly wake up threads that are stuck - revoke(). */ 393 tp->t_revokecnt++; 394 tty_wakeup(tp, FREAD|FWRITE); 395 cv_broadcast(&tp->t_bgwait); 396 cv_broadcast(&tp->t_dcdwait); 397 398 ttydev_leave(tp); 399 400 return (0); 401 } 402 403 static __inline int 404 tty_is_ctty(struct tty *tp, struct proc *p) 405 { 406 407 tty_lock_assert(tp, MA_OWNED); 408 409 return (p->p_session == tp->t_session && p->p_flag & P_CONTROLT); 410 } 411 412 int 413 tty_wait_background(struct tty *tp, struct thread *td, int sig) 414 { 415 struct proc *p = td->td_proc; 416 struct pgrp *pg; 417 ksiginfo_t ksi; 418 int error; 419 420 MPASS(sig == SIGTTIN || sig == SIGTTOU); 421 tty_lock_assert(tp, MA_OWNED); 422 423 for (;;) { 424 PROC_LOCK(p); 425 /* 426 * The process should only sleep, when: 427 * - This terminal is the controlling terminal 428 * - Its process group is not the foreground process 429 * group 430 * - The parent process isn't waiting for the child to 431 * exit 432 * - the signal to send to the process isn't masked 433 */ 434 if (!tty_is_ctty(tp, p) || p->p_pgrp == tp->t_pgrp) { 435 /* Allow the action to happen. */ 436 PROC_UNLOCK(p); 437 return (0); 438 } 439 440 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, sig) || 441 SIGISMEMBER(td->td_sigmask, sig)) { 442 /* Only allow them in write()/ioctl(). */ 443 PROC_UNLOCK(p); 444 return (sig == SIGTTOU ? 0 : EIO); 445 } 446 447 pg = p->p_pgrp; 448 if (p->p_flag & P_PPWAIT || pg->pg_jobc == 0) { 449 /* Don't allow the action to happen. */ 450 PROC_UNLOCK(p); 451 return (EIO); 452 } 453 PROC_UNLOCK(p); 454 455 /* 456 * Send the signal and sleep until we're the new 457 * foreground process group. 458 */ 459 if (sig != 0) { 460 ksiginfo_init(&ksi); 461 ksi.ksi_code = SI_KERNEL; 462 ksi.ksi_signo = sig; 463 sig = 0; 464 } 465 PGRP_LOCK(pg); 466 pgsignal(pg, ksi.ksi_signo, 1, &ksi); 467 PGRP_UNLOCK(pg); 468 469 error = tty_wait(tp, &tp->t_bgwait); 470 if (error) 471 return (error); 472 } 473 } 474 475 static int 476 ttydev_read(struct cdev *dev, struct uio *uio, int ioflag) 477 { 478 struct tty *tp = dev->si_drv1; 479 int error; 480 481 error = ttydev_enter(tp); 482 if (error) 483 goto done; 484 error = ttydisc_read(tp, uio, ioflag); 485 tty_unlock(tp); 486 487 /* 488 * The read() call should not throw an error when the device is 489 * being destroyed. Silently convert it to an EOF. 490 */ 491 done: if (error == ENXIO) 492 error = 0; 493 return (error); 494 } 495 496 static int 497 ttydev_write(struct cdev *dev, struct uio *uio, int ioflag) 498 { 499 struct tty *tp = dev->si_drv1; 500 int error; 501 502 error = ttydev_enter(tp); 503 if (error) 504 return (error); 505 506 if (tp->t_termios.c_lflag & TOSTOP) { 507 error = tty_wait_background(tp, curthread, SIGTTOU); 508 if (error) 509 goto done; 510 } 511 512 if (ioflag & IO_NDELAY && tp->t_flags & TF_BUSY_OUT) { 513 /* Allow non-blocking writes to bypass serialization. */ 514 error = ttydisc_write(tp, uio, ioflag); 515 } else { 516 /* Serialize write() calls. */ 517 while (tp->t_flags & TF_BUSY_OUT) { 518 error = tty_wait(tp, &tp->t_outserwait); 519 if (error) 520 goto done; 521 } 522 523 tp->t_flags |= TF_BUSY_OUT; 524 error = ttydisc_write(tp, uio, ioflag); 525 tp->t_flags &= ~TF_BUSY_OUT; 526 cv_signal(&tp->t_outserwait); 527 } 528 529 done: tty_unlock(tp); 530 return (error); 531 } 532 533 static int 534 ttydev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 535 struct thread *td) 536 { 537 struct tty *tp = dev->si_drv1; 538 int error; 539 540 error = ttydev_enter(tp); 541 if (error) 542 return (error); 543 544 switch (cmd) { 545 case TIOCCBRK: 546 case TIOCCONS: 547 case TIOCDRAIN: 548 case TIOCEXCL: 549 case TIOCFLUSH: 550 case TIOCNXCL: 551 case TIOCSBRK: 552 case TIOCSCTTY: 553 case TIOCSETA: 554 case TIOCSETAF: 555 case TIOCSETAW: 556 case TIOCSPGRP: 557 case TIOCSTART: 558 case TIOCSTAT: 559 case TIOCSTI: 560 case TIOCSTOP: 561 case TIOCSWINSZ: 562 #if 0 563 case TIOCSDRAINWAIT: 564 case TIOCSETD: 565 #endif 566 #ifdef COMPAT_43TTY 567 case TIOCLBIC: 568 case TIOCLBIS: 569 case TIOCLSET: 570 case TIOCSETC: 571 case OTIOCSETD: 572 case TIOCSETN: 573 case TIOCSETP: 574 case TIOCSLTC: 575 #endif /* COMPAT_43TTY */ 576 /* 577 * If the ioctl() causes the TTY to be modified, let it 578 * wait in the background. 579 */ 580 error = tty_wait_background(tp, curthread, SIGTTOU); 581 if (error) 582 goto done; 583 } 584 585 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 586 struct termios *old = &tp->t_termios; 587 struct termios *new = (struct termios *)data; 588 struct termios *lock = TTY_CALLOUT(tp, dev) ? 589 &tp->t_termios_lock_out : &tp->t_termios_lock_in; 590 int cc; 591 592 /* 593 * Lock state devices. Just overwrite the values of the 594 * commands that are currently in use. 595 */ 596 new->c_iflag = (old->c_iflag & lock->c_iflag) | 597 (new->c_iflag & ~lock->c_iflag); 598 new->c_oflag = (old->c_oflag & lock->c_oflag) | 599 (new->c_oflag & ~lock->c_oflag); 600 new->c_cflag = (old->c_cflag & lock->c_cflag) | 601 (new->c_cflag & ~lock->c_cflag); 602 new->c_lflag = (old->c_lflag & lock->c_lflag) | 603 (new->c_lflag & ~lock->c_lflag); 604 for (cc = 0; cc < NCCS; ++cc) 605 if (lock->c_cc[cc]) 606 new->c_cc[cc] = old->c_cc[cc]; 607 if (lock->c_ispeed) 608 new->c_ispeed = old->c_ispeed; 609 if (lock->c_ospeed) 610 new->c_ospeed = old->c_ospeed; 611 } 612 613 error = tty_ioctl(tp, cmd, data, fflag, td); 614 done: tty_unlock(tp); 615 616 return (error); 617 } 618 619 static int 620 ttydev_poll(struct cdev *dev, int events, struct thread *td) 621 { 622 struct tty *tp = dev->si_drv1; 623 int error, revents = 0; 624 625 error = ttydev_enter(tp); 626 if (error) 627 return ((events & (POLLIN|POLLRDNORM)) | POLLHUP); 628 629 if (events & (POLLIN|POLLRDNORM)) { 630 /* See if we can read something. */ 631 if (ttydisc_read_poll(tp) > 0) 632 revents |= events & (POLLIN|POLLRDNORM); 633 } 634 635 if (tp->t_flags & TF_ZOMBIE) { 636 /* Hangup flag on zombie state. */ 637 revents |= POLLHUP; 638 } else if (events & (POLLOUT|POLLWRNORM)) { 639 /* See if we can write something. */ 640 if (ttydisc_write_poll(tp) > 0) 641 revents |= events & (POLLOUT|POLLWRNORM); 642 } 643 644 if (revents == 0) { 645 if (events & (POLLIN|POLLRDNORM)) 646 selrecord(td, &tp->t_inpoll); 647 if (events & (POLLOUT|POLLWRNORM)) 648 selrecord(td, &tp->t_outpoll); 649 } 650 651 tty_unlock(tp); 652 653 return (revents); 654 } 655 656 static int 657 ttydev_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 658 int nprot, vm_memattr_t *memattr) 659 { 660 struct tty *tp = dev->si_drv1; 661 int error; 662 663 /* Handle mmap() through the driver. */ 664 665 error = ttydev_enter(tp); 666 if (error) 667 return (-1); 668 error = ttydevsw_mmap(tp, offset, paddr, nprot, memattr); 669 tty_unlock(tp); 670 671 return (error); 672 } 673 674 /* 675 * kqueue support. 676 */ 677 678 static void 679 tty_kqops_read_detach(struct knote *kn) 680 { 681 struct tty *tp = kn->kn_hook; 682 683 knlist_remove(&tp->t_inpoll.si_note, kn, 0); 684 } 685 686 static int 687 tty_kqops_read_event(struct knote *kn, long hint __unused) 688 { 689 struct tty *tp = kn->kn_hook; 690 691 tty_lock_assert(tp, MA_OWNED); 692 693 if (tty_gone(tp) || tp->t_flags & TF_ZOMBIE) { 694 kn->kn_flags |= EV_EOF; 695 return (1); 696 } else { 697 kn->kn_data = ttydisc_read_poll(tp); 698 return (kn->kn_data > 0); 699 } 700 } 701 702 static void 703 tty_kqops_write_detach(struct knote *kn) 704 { 705 struct tty *tp = kn->kn_hook; 706 707 knlist_remove(&tp->t_outpoll.si_note, kn, 0); 708 } 709 710 static int 711 tty_kqops_write_event(struct knote *kn, long hint __unused) 712 { 713 struct tty *tp = kn->kn_hook; 714 715 tty_lock_assert(tp, MA_OWNED); 716 717 if (tty_gone(tp)) { 718 kn->kn_flags |= EV_EOF; 719 return (1); 720 } else { 721 kn->kn_data = ttydisc_write_poll(tp); 722 return (kn->kn_data > 0); 723 } 724 } 725 726 static struct filterops tty_kqops_read = { 727 .f_isfd = 1, 728 .f_detach = tty_kqops_read_detach, 729 .f_event = tty_kqops_read_event, 730 }; 731 732 static struct filterops tty_kqops_write = { 733 .f_isfd = 1, 734 .f_detach = tty_kqops_write_detach, 735 .f_event = tty_kqops_write_event, 736 }; 737 738 static int 739 ttydev_kqfilter(struct cdev *dev, struct knote *kn) 740 { 741 struct tty *tp = dev->si_drv1; 742 int error; 743 744 error = ttydev_enter(tp); 745 if (error) 746 return (error); 747 748 switch (kn->kn_filter) { 749 case EVFILT_READ: 750 kn->kn_hook = tp; 751 kn->kn_fop = &tty_kqops_read; 752 knlist_add(&tp->t_inpoll.si_note, kn, 1); 753 break; 754 case EVFILT_WRITE: 755 kn->kn_hook = tp; 756 kn->kn_fop = &tty_kqops_write; 757 knlist_add(&tp->t_outpoll.si_note, kn, 1); 758 break; 759 default: 760 error = EINVAL; 761 break; 762 } 763 764 tty_unlock(tp); 765 return (error); 766 } 767 768 static struct cdevsw ttydev_cdevsw = { 769 .d_version = D_VERSION, 770 .d_open = ttydev_open, 771 .d_close = ttydev_close, 772 .d_read = ttydev_read, 773 .d_write = ttydev_write, 774 .d_ioctl = ttydev_ioctl, 775 .d_kqfilter = ttydev_kqfilter, 776 .d_poll = ttydev_poll, 777 .d_mmap = ttydev_mmap, 778 .d_name = "ttydev", 779 .d_flags = D_TTY, 780 }; 781 782 /* 783 * Init/lock-state devices 784 */ 785 786 static int 787 ttyil_open(struct cdev *dev, int oflags __unused, int devtype __unused, 788 struct thread *td) 789 { 790 struct tty *tp; 791 int error; 792 793 tp = dev->si_drv1; 794 error = 0; 795 tty_lock(tp); 796 if (tty_gone(tp)) 797 error = ENODEV; 798 tty_unlock(tp); 799 800 return (error); 801 } 802 803 static int 804 ttyil_close(struct cdev *dev __unused, int flag __unused, int mode __unused, 805 struct thread *td __unused) 806 { 807 808 return (0); 809 } 810 811 static int 812 ttyil_rdwr(struct cdev *dev __unused, struct uio *uio __unused, 813 int ioflag __unused) 814 { 815 816 return (ENODEV); 817 } 818 819 static int 820 ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 821 struct thread *td) 822 { 823 struct tty *tp = dev->si_drv1; 824 int error; 825 826 tty_lock(tp); 827 if (tty_gone(tp)) { 828 error = ENODEV; 829 goto done; 830 } 831 832 error = ttydevsw_cioctl(tp, dev2unit(dev), cmd, data, td); 833 if (error != ENOIOCTL) 834 goto done; 835 error = 0; 836 837 switch (cmd) { 838 case TIOCGETA: 839 /* Obtain terminal flags through tcgetattr(). */ 840 *(struct termios*)data = *(struct termios*)dev->si_drv2; 841 break; 842 case TIOCSETA: 843 /* Set terminal flags through tcsetattr(). */ 844 error = priv_check(td, PRIV_TTY_SETA); 845 if (error) 846 break; 847 *(struct termios*)dev->si_drv2 = *(struct termios*)data; 848 break; 849 case TIOCGETD: 850 *(int *)data = TTYDISC; 851 break; 852 case TIOCGWINSZ: 853 bzero(data, sizeof(struct winsize)); 854 break; 855 default: 856 error = ENOTTY; 857 } 858 859 done: tty_unlock(tp); 860 return (error); 861 } 862 863 static struct cdevsw ttyil_cdevsw = { 864 .d_version = D_VERSION, 865 .d_open = ttyil_open, 866 .d_close = ttyil_close, 867 .d_read = ttyil_rdwr, 868 .d_write = ttyil_rdwr, 869 .d_ioctl = ttyil_ioctl, 870 .d_name = "ttyil", 871 .d_flags = D_TTY, 872 }; 873 874 static void 875 tty_init_termios(struct tty *tp) 876 { 877 struct termios *t = &tp->t_termios_init_in; 878 879 t->c_cflag = TTYDEF_CFLAG; 880 t->c_iflag = TTYDEF_IFLAG; 881 t->c_lflag = TTYDEF_LFLAG; 882 t->c_oflag = TTYDEF_OFLAG; 883 t->c_ispeed = TTYDEF_SPEED; 884 t->c_ospeed = TTYDEF_SPEED; 885 memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars); 886 887 tp->t_termios_init_out = *t; 888 } 889 890 void 891 tty_init_console(struct tty *tp, speed_t s) 892 { 893 struct termios *ti = &tp->t_termios_init_in; 894 struct termios *to = &tp->t_termios_init_out; 895 896 if (s != 0) { 897 ti->c_ispeed = ti->c_ospeed = s; 898 to->c_ispeed = to->c_ospeed = s; 899 } 900 901 ti->c_cflag |= CLOCAL; 902 to->c_cflag |= CLOCAL; 903 } 904 905 /* 906 * Standard device routine implementations, mostly meant for 907 * pseudo-terminal device drivers. When a driver creates a new terminal 908 * device class, missing routines are patched. 909 */ 910 911 static int 912 ttydevsw_defopen(struct tty *tp __unused) 913 { 914 915 return (0); 916 } 917 918 static void 919 ttydevsw_defclose(struct tty *tp __unused) 920 { 921 922 } 923 924 static void 925 ttydevsw_defoutwakeup(struct tty *tp __unused) 926 { 927 928 panic("Terminal device has output, while not implemented"); 929 } 930 931 static void 932 ttydevsw_definwakeup(struct tty *tp __unused) 933 { 934 935 } 936 937 static int 938 ttydevsw_defioctl(struct tty *tp __unused, u_long cmd __unused, 939 caddr_t data __unused, struct thread *td __unused) 940 { 941 942 return (ENOIOCTL); 943 } 944 945 static int 946 ttydevsw_defcioctl(struct tty *tp __unused, int unit __unused, 947 u_long cmd __unused, caddr_t data __unused, struct thread *td __unused) 948 { 949 950 return (ENOIOCTL); 951 } 952 953 static int 954 ttydevsw_defparam(struct tty *tp __unused, struct termios *t) 955 { 956 957 /* 958 * Allow the baud rate to be adjusted for pseudo-devices, but at 959 * least restrict it to 115200 to prevent excessive buffer 960 * usage. Also disallow 0, to prevent foot shooting. 961 */ 962 if (t->c_ispeed < B50) 963 t->c_ispeed = B50; 964 else if (t->c_ispeed > B115200) 965 t->c_ispeed = B115200; 966 if (t->c_ospeed < B50) 967 t->c_ospeed = B50; 968 else if (t->c_ospeed > B115200) 969 t->c_ospeed = B115200; 970 t->c_cflag |= CREAD; 971 972 return (0); 973 } 974 975 static int 976 ttydevsw_defmodem(struct tty *tp __unused, int sigon __unused, 977 int sigoff __unused) 978 { 979 980 /* Simulate a carrier to make the TTY layer happy. */ 981 return (SER_DCD); 982 } 983 984 static int 985 ttydevsw_defmmap(struct tty *tp __unused, vm_ooffset_t offset __unused, 986 vm_paddr_t *paddr __unused, int nprot __unused, 987 vm_memattr_t *memattr __unused) 988 { 989 990 return (-1); 991 } 992 993 static void 994 ttydevsw_defpktnotify(struct tty *tp __unused, char event __unused) 995 { 996 997 } 998 999 static void 1000 ttydevsw_deffree(void *softc __unused) 1001 { 1002 1003 panic("Terminal device freed without a free-handler"); 1004 } 1005 1006 static bool 1007 ttydevsw_defbusy(struct tty *tp __unused) 1008 { 1009 1010 return (FALSE); 1011 } 1012 1013 /* 1014 * TTY allocation and deallocation. TTY devices can be deallocated when 1015 * the driver doesn't use it anymore, when the TTY isn't a session's 1016 * controlling TTY and when the device node isn't opened through devfs. 1017 */ 1018 1019 struct tty * 1020 tty_alloc(struct ttydevsw *tsw, void *sc) 1021 { 1022 1023 return (tty_alloc_mutex(tsw, sc, NULL)); 1024 } 1025 1026 struct tty * 1027 tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex) 1028 { 1029 struct tty *tp; 1030 1031 /* Make sure the driver defines all routines. */ 1032 #define PATCH_FUNC(x) do { \ 1033 if (tsw->tsw_ ## x == NULL) \ 1034 tsw->tsw_ ## x = ttydevsw_def ## x; \ 1035 } while (0) 1036 PATCH_FUNC(open); 1037 PATCH_FUNC(close); 1038 PATCH_FUNC(outwakeup); 1039 PATCH_FUNC(inwakeup); 1040 PATCH_FUNC(ioctl); 1041 PATCH_FUNC(cioctl); 1042 PATCH_FUNC(param); 1043 PATCH_FUNC(modem); 1044 PATCH_FUNC(mmap); 1045 PATCH_FUNC(pktnotify); 1046 PATCH_FUNC(free); 1047 PATCH_FUNC(busy); 1048 #undef PATCH_FUNC 1049 1050 tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO); 1051 tp->t_devsw = tsw; 1052 tp->t_devswsoftc = sc; 1053 tp->t_flags = tsw->tsw_flags; 1054 tp->t_drainwait = tty_drainwait; 1055 1056 tty_init_termios(tp); 1057 1058 cv_init(&tp->t_inwait, "ttyin"); 1059 cv_init(&tp->t_outwait, "ttyout"); 1060 cv_init(&tp->t_outserwait, "ttyosr"); 1061 cv_init(&tp->t_bgwait, "ttybg"); 1062 cv_init(&tp->t_dcdwait, "ttydcd"); 1063 1064 /* Allow drivers to use a custom mutex to lock the TTY. */ 1065 if (mutex != NULL) { 1066 tp->t_mtx = mutex; 1067 } else { 1068 tp->t_mtx = &tp->t_mtxobj; 1069 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF); 1070 } 1071 1072 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx); 1073 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx); 1074 1075 return (tp); 1076 } 1077 1078 static void 1079 tty_dealloc(void *arg) 1080 { 1081 struct tty *tp = arg; 1082 1083 /* 1084 * ttyydev_leave() usually frees the i/o queues earlier, but it is 1085 * not always called between queue allocation and here. The queues 1086 * may be allocated by ioctls on a pty control device without the 1087 * corresponding pty slave device ever being open, or after it is 1088 * closed. 1089 */ 1090 ttyinq_free(&tp->t_inq); 1091 ttyoutq_free(&tp->t_outq); 1092 seldrain(&tp->t_inpoll); 1093 seldrain(&tp->t_outpoll); 1094 knlist_destroy(&tp->t_inpoll.si_note); 1095 knlist_destroy(&tp->t_outpoll.si_note); 1096 1097 cv_destroy(&tp->t_inwait); 1098 cv_destroy(&tp->t_outwait); 1099 cv_destroy(&tp->t_bgwait); 1100 cv_destroy(&tp->t_dcdwait); 1101 cv_destroy(&tp->t_outserwait); 1102 1103 if (tp->t_mtx == &tp->t_mtxobj) 1104 mtx_destroy(&tp->t_mtxobj); 1105 ttydevsw_free(tp); 1106 free(tp, M_TTY); 1107 } 1108 1109 static void 1110 tty_rel_free(struct tty *tp) 1111 { 1112 struct cdev *dev; 1113 1114 tty_lock_assert(tp, MA_OWNED); 1115 1116 #define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE) 1117 if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) { 1118 /* TTY is still in use. */ 1119 tty_unlock(tp); 1120 return; 1121 } 1122 1123 /* Stop asynchronous I/O. */ 1124 funsetown(&tp->t_sigio); 1125 1126 /* TTY can be deallocated. */ 1127 dev = tp->t_dev; 1128 tp->t_dev = NULL; 1129 tty_unlock(tp); 1130 1131 if (dev != NULL) { 1132 sx_xlock(&tty_list_sx); 1133 TAILQ_REMOVE(&tty_list, tp, t_list); 1134 tty_list_count--; 1135 sx_xunlock(&tty_list_sx); 1136 destroy_dev_sched_cb(dev, tty_dealloc, tp); 1137 } 1138 } 1139 1140 void 1141 tty_rel_pgrp(struct tty *tp, struct pgrp *pg) 1142 { 1143 1144 MPASS(tp->t_sessioncnt > 0); 1145 tty_lock_assert(tp, MA_OWNED); 1146 1147 if (tp->t_pgrp == pg) 1148 tp->t_pgrp = NULL; 1149 1150 tty_unlock(tp); 1151 } 1152 1153 void 1154 tty_rel_sess(struct tty *tp, struct session *sess) 1155 { 1156 1157 MPASS(tp->t_sessioncnt > 0); 1158 1159 /* Current session has left. */ 1160 if (tp->t_session == sess) { 1161 tp->t_session = NULL; 1162 MPASS(tp->t_pgrp == NULL); 1163 } 1164 tp->t_sessioncnt--; 1165 tty_rel_free(tp); 1166 } 1167 1168 void 1169 tty_rel_gone(struct tty *tp) 1170 { 1171 1172 tty_lock_assert(tp, MA_OWNED); 1173 MPASS(!tty_gone(tp)); 1174 1175 /* Simulate carrier removal. */ 1176 ttydisc_modem(tp, 0); 1177 1178 /* Wake up all blocked threads. */ 1179 tty_wakeup(tp, FREAD|FWRITE); 1180 cv_broadcast(&tp->t_bgwait); 1181 cv_broadcast(&tp->t_dcdwait); 1182 1183 tp->t_flags |= TF_GONE; 1184 tty_rel_free(tp); 1185 } 1186 1187 static int 1188 tty_drop_ctty(struct tty *tp, struct proc *p) 1189 { 1190 struct session *session; 1191 struct vnode *vp; 1192 1193 /* 1194 * This looks terrible, but it's generally safe as long as the tty 1195 * hasn't gone away while we had the lock dropped. All of our sanity 1196 * checking that this operation is OK happens after we've picked it back 1197 * up, so other state changes are generally not fatal and the potential 1198 * for this particular operation to happen out-of-order in a 1199 * multithreaded scenario is likely a non-issue. 1200 */ 1201 tty_unlock(tp); 1202 sx_xlock(&proctree_lock); 1203 tty_lock(tp); 1204 if (tty_gone(tp)) { 1205 sx_xunlock(&proctree_lock); 1206 return (ENODEV); 1207 } 1208 1209 /* 1210 * If the session doesn't have a controlling TTY, or if we weren't 1211 * invoked on the controlling TTY, we'll return ENOIOCTL as we've 1212 * historically done. 1213 */ 1214 session = p->p_session; 1215 if (session->s_ttyp == NULL || session->s_ttyp != tp) { 1216 sx_xunlock(&proctree_lock); 1217 return (ENOTTY); 1218 } 1219 1220 if (!SESS_LEADER(p)) { 1221 sx_xunlock(&proctree_lock); 1222 return (EPERM); 1223 } 1224 1225 PROC_LOCK(p); 1226 SESS_LOCK(session); 1227 vp = session->s_ttyvp; 1228 session->s_ttyp = NULL; 1229 session->s_ttyvp = NULL; 1230 session->s_ttydp = NULL; 1231 SESS_UNLOCK(session); 1232 1233 tp->t_sessioncnt--; 1234 p->p_flag &= ~P_CONTROLT; 1235 PROC_UNLOCK(p); 1236 sx_xunlock(&proctree_lock); 1237 1238 /* 1239 * If we did have a vnode, release our reference. Ordinarily we manage 1240 * these at the devfs layer, but we can't necessarily know that we were 1241 * invoked on the vnode referenced in the session (i.e. the vnode we 1242 * hold a reference to). We explicitly don't check VBAD/VI_DOOMED here 1243 * to avoid a vnode leak -- in circumstances elsewhere where we'd hit a 1244 * VI_DOOMED vnode, release has been deferred until the controlling TTY 1245 * is either changed or released. 1246 */ 1247 if (vp != NULL) 1248 vrele(vp); 1249 return (0); 1250 } 1251 1252 /* 1253 * Exposing information about current TTY's through sysctl 1254 */ 1255 1256 static void 1257 tty_to_xtty(struct tty *tp, struct xtty *xt) 1258 { 1259 1260 tty_lock_assert(tp, MA_OWNED); 1261 1262 xt->xt_size = sizeof(struct xtty); 1263 xt->xt_insize = ttyinq_getsize(&tp->t_inq); 1264 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq); 1265 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq); 1266 xt->xt_inlow = tp->t_inlow; 1267 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq); 1268 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq); 1269 xt->xt_outlow = tp->t_outlow; 1270 xt->xt_column = tp->t_column; 1271 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1272 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0; 1273 xt->xt_flags = tp->t_flags; 1274 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV; 1275 } 1276 1277 static int 1278 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 1279 { 1280 unsigned long lsize; 1281 struct xtty *xtlist, *xt; 1282 struct tty *tp; 1283 int error; 1284 1285 sx_slock(&tty_list_sx); 1286 lsize = tty_list_count * sizeof(struct xtty); 1287 if (lsize == 0) { 1288 sx_sunlock(&tty_list_sx); 1289 return (0); 1290 } 1291 1292 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK); 1293 1294 TAILQ_FOREACH(tp, &tty_list, t_list) { 1295 tty_lock(tp); 1296 tty_to_xtty(tp, xt); 1297 tty_unlock(tp); 1298 xt++; 1299 } 1300 sx_sunlock(&tty_list_sx); 1301 1302 error = SYSCTL_OUT(req, xtlist, lsize); 1303 free(xtlist, M_TTY); 1304 return (error); 1305 } 1306 1307 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 1308 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs"); 1309 1310 /* 1311 * Device node creation. Device has been set up, now we can expose it to 1312 * the user. 1313 */ 1314 1315 int 1316 tty_makedevf(struct tty *tp, struct ucred *cred, int flags, 1317 const char *fmt, ...) 1318 { 1319 va_list ap; 1320 struct make_dev_args args; 1321 struct cdev *dev, *init, *lock, *cua, *cinit, *clock; 1322 const char *prefix = "tty"; 1323 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */ 1324 uid_t uid; 1325 gid_t gid; 1326 mode_t mode; 1327 int error; 1328 1329 /* Remove "tty" prefix from devices like PTY's. */ 1330 if (tp->t_flags & TF_NOPREFIX) 1331 prefix = ""; 1332 1333 va_start(ap, fmt); 1334 vsnrprintf(name, sizeof name, 32, fmt, ap); 1335 va_end(ap); 1336 1337 if (cred == NULL) { 1338 /* System device. */ 1339 uid = UID_ROOT; 1340 gid = GID_WHEEL; 1341 mode = S_IRUSR|S_IWUSR; 1342 } else { 1343 /* User device. */ 1344 uid = cred->cr_ruid; 1345 gid = GID_TTY; 1346 mode = S_IRUSR|S_IWUSR|S_IWGRP; 1347 } 1348 1349 flags = flags & TTYMK_CLONING ? MAKEDEV_REF : 0; 1350 flags |= MAKEDEV_CHECKNAME; 1351 1352 /* Master call-in device. */ 1353 make_dev_args_init(&args); 1354 args.mda_flags = flags; 1355 args.mda_devsw = &ttydev_cdevsw; 1356 args.mda_cr = cred; 1357 args.mda_uid = uid; 1358 args.mda_gid = gid; 1359 args.mda_mode = mode; 1360 args.mda_si_drv1 = tp; 1361 error = make_dev_s(&args, &dev, "%s%s", prefix, name); 1362 if (error != 0) 1363 return (error); 1364 tp->t_dev = dev; 1365 1366 init = lock = cua = cinit = clock = NULL; 1367 1368 /* Slave call-in devices. */ 1369 if (tp->t_flags & TF_INITLOCK) { 1370 args.mda_devsw = &ttyil_cdevsw; 1371 args.mda_unit = TTYUNIT_INIT; 1372 args.mda_si_drv1 = tp; 1373 args.mda_si_drv2 = &tp->t_termios_init_in; 1374 error = make_dev_s(&args, &init, "%s%s.init", prefix, name); 1375 if (error != 0) 1376 goto fail; 1377 dev_depends(dev, init); 1378 1379 args.mda_unit = TTYUNIT_LOCK; 1380 args.mda_si_drv2 = &tp->t_termios_lock_in; 1381 error = make_dev_s(&args, &lock, "%s%s.lock", prefix, name); 1382 if (error != 0) 1383 goto fail; 1384 dev_depends(dev, lock); 1385 } 1386 1387 /* Call-out devices. */ 1388 if (tp->t_flags & TF_CALLOUT) { 1389 make_dev_args_init(&args); 1390 args.mda_flags = flags; 1391 args.mda_devsw = &ttydev_cdevsw; 1392 args.mda_cr = cred; 1393 args.mda_uid = UID_UUCP; 1394 args.mda_gid = GID_DIALER; 1395 args.mda_mode = 0660; 1396 args.mda_unit = TTYUNIT_CALLOUT; 1397 args.mda_si_drv1 = tp; 1398 error = make_dev_s(&args, &cua, "cua%s", name); 1399 if (error != 0) 1400 goto fail; 1401 dev_depends(dev, cua); 1402 1403 /* Slave call-out devices. */ 1404 if (tp->t_flags & TF_INITLOCK) { 1405 args.mda_devsw = &ttyil_cdevsw; 1406 args.mda_unit = TTYUNIT_CALLOUT | TTYUNIT_INIT; 1407 args.mda_si_drv2 = &tp->t_termios_init_out; 1408 error = make_dev_s(&args, &cinit, "cua%s.init", name); 1409 if (error != 0) 1410 goto fail; 1411 dev_depends(dev, cinit); 1412 1413 args.mda_unit = TTYUNIT_CALLOUT | TTYUNIT_LOCK; 1414 args.mda_si_drv2 = &tp->t_termios_lock_out; 1415 error = make_dev_s(&args, &clock, "cua%s.lock", name); 1416 if (error != 0) 1417 goto fail; 1418 dev_depends(dev, clock); 1419 } 1420 } 1421 1422 sx_xlock(&tty_list_sx); 1423 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 1424 tty_list_count++; 1425 sx_xunlock(&tty_list_sx); 1426 1427 return (0); 1428 1429 fail: 1430 destroy_dev(dev); 1431 if (init) 1432 destroy_dev(init); 1433 if (lock) 1434 destroy_dev(lock); 1435 if (cinit) 1436 destroy_dev(cinit); 1437 if (clock) 1438 destroy_dev(clock); 1439 1440 return (error); 1441 } 1442 1443 /* 1444 * Signalling processes. 1445 */ 1446 1447 void 1448 tty_signal_sessleader(struct tty *tp, int sig) 1449 { 1450 struct proc *p; 1451 1452 tty_lock_assert(tp, MA_OWNED); 1453 MPASS(sig >= 1 && sig < NSIG); 1454 1455 /* Make signals start output again. */ 1456 tp->t_flags &= ~TF_STOPPED; 1457 1458 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) { 1459 p = tp->t_session->s_leader; 1460 PROC_LOCK(p); 1461 kern_psignal(p, sig); 1462 PROC_UNLOCK(p); 1463 } 1464 } 1465 1466 void 1467 tty_signal_pgrp(struct tty *tp, int sig) 1468 { 1469 ksiginfo_t ksi; 1470 1471 tty_lock_assert(tp, MA_OWNED); 1472 MPASS(sig >= 1 && sig < NSIG); 1473 1474 /* Make signals start output again. */ 1475 tp->t_flags &= ~TF_STOPPED; 1476 1477 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO)) 1478 tty_info(tp); 1479 if (tp->t_pgrp != NULL) { 1480 ksiginfo_init(&ksi); 1481 ksi.ksi_signo = sig; 1482 ksi.ksi_code = SI_KERNEL; 1483 PGRP_LOCK(tp->t_pgrp); 1484 pgsignal(tp->t_pgrp, sig, 1, &ksi); 1485 PGRP_UNLOCK(tp->t_pgrp); 1486 } 1487 } 1488 1489 void 1490 tty_wakeup(struct tty *tp, int flags) 1491 { 1492 1493 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL) 1494 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 1495 1496 if (flags & FWRITE) { 1497 cv_broadcast(&tp->t_outwait); 1498 selwakeup(&tp->t_outpoll); 1499 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0); 1500 } 1501 if (flags & FREAD) { 1502 cv_broadcast(&tp->t_inwait); 1503 selwakeup(&tp->t_inpoll); 1504 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0); 1505 } 1506 } 1507 1508 int 1509 tty_wait(struct tty *tp, struct cv *cv) 1510 { 1511 int error; 1512 int revokecnt = tp->t_revokecnt; 1513 1514 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1515 MPASS(!tty_gone(tp)); 1516 1517 error = cv_wait_sig(cv, tp->t_mtx); 1518 1519 /* Bail out when the device slipped away. */ 1520 if (tty_gone(tp)) 1521 return (ENXIO); 1522 1523 /* Restart the system call when we may have been revoked. */ 1524 if (tp->t_revokecnt != revokecnt) 1525 return (ERESTART); 1526 1527 return (error); 1528 } 1529 1530 int 1531 tty_timedwait(struct tty *tp, struct cv *cv, int hz) 1532 { 1533 int error; 1534 int revokecnt = tp->t_revokecnt; 1535 1536 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED); 1537 MPASS(!tty_gone(tp)); 1538 1539 error = cv_timedwait_sig(cv, tp->t_mtx, hz); 1540 1541 /* Bail out when the device slipped away. */ 1542 if (tty_gone(tp)) 1543 return (ENXIO); 1544 1545 /* Restart the system call when we may have been revoked. */ 1546 if (tp->t_revokecnt != revokecnt) 1547 return (ERESTART); 1548 1549 return (error); 1550 } 1551 1552 void 1553 tty_flush(struct tty *tp, int flags) 1554 { 1555 1556 if (flags & FWRITE) { 1557 tp->t_flags &= ~TF_HIWAT_OUT; 1558 ttyoutq_flush(&tp->t_outq); 1559 tty_wakeup(tp, FWRITE); 1560 if (!tty_gone(tp)) { 1561 ttydevsw_outwakeup(tp); 1562 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE); 1563 } 1564 } 1565 if (flags & FREAD) { 1566 tty_hiwat_in_unblock(tp); 1567 ttyinq_flush(&tp->t_inq); 1568 tty_wakeup(tp, FREAD); 1569 if (!tty_gone(tp)) { 1570 ttydevsw_inwakeup(tp); 1571 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD); 1572 } 1573 } 1574 } 1575 1576 void 1577 tty_set_winsize(struct tty *tp, const struct winsize *wsz) 1578 { 1579 1580 if (memcmp(&tp->t_winsize, wsz, sizeof(*wsz)) == 0) 1581 return; 1582 tp->t_winsize = *wsz; 1583 tty_signal_pgrp(tp, SIGWINCH); 1584 } 1585 1586 static int 1587 tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, 1588 struct thread *td) 1589 { 1590 int error; 1591 1592 switch (cmd) { 1593 /* 1594 * Modem commands. 1595 * The SER_* and TIOCM_* flags are the same, but one bit 1596 * shifted. I don't know why. 1597 */ 1598 case TIOCSDTR: 1599 ttydevsw_modem(tp, SER_DTR, 0); 1600 return (0); 1601 case TIOCCDTR: 1602 ttydevsw_modem(tp, 0, SER_DTR); 1603 return (0); 1604 case TIOCMSET: { 1605 int bits = *(int *)data; 1606 ttydevsw_modem(tp, 1607 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 1608 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1609 return (0); 1610 } 1611 case TIOCMBIS: { 1612 int bits = *(int *)data; 1613 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0); 1614 return (0); 1615 } 1616 case TIOCMBIC: { 1617 int bits = *(int *)data; 1618 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1); 1619 return (0); 1620 } 1621 case TIOCMGET: 1622 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1); 1623 return (0); 1624 1625 case FIOASYNC: 1626 if (*(int *)data) 1627 tp->t_flags |= TF_ASYNC; 1628 else 1629 tp->t_flags &= ~TF_ASYNC; 1630 return (0); 1631 case FIONBIO: 1632 /* This device supports non-blocking operation. */ 1633 return (0); 1634 case FIONREAD: 1635 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq); 1636 return (0); 1637 case FIONWRITE: 1638 case TIOCOUTQ: 1639 *(int *)data = ttyoutq_bytesused(&tp->t_outq); 1640 return (0); 1641 case FIOSETOWN: 1642 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1643 /* Not allowed to set ownership. */ 1644 return (ENOTTY); 1645 1646 /* Temporarily unlock the TTY to set ownership. */ 1647 tty_unlock(tp); 1648 error = fsetown(*(int *)data, &tp->t_sigio); 1649 tty_lock(tp); 1650 return (error); 1651 case FIOGETOWN: 1652 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc)) 1653 /* Not allowed to set ownership. */ 1654 return (ENOTTY); 1655 1656 /* Get ownership. */ 1657 *(int *)data = fgetown(&tp->t_sigio); 1658 return (0); 1659 case TIOCGETA: 1660 /* Obtain terminal flags through tcgetattr(). */ 1661 *(struct termios*)data = tp->t_termios; 1662 return (0); 1663 case TIOCSETA: 1664 case TIOCSETAW: 1665 case TIOCSETAF: { 1666 struct termios *t = data; 1667 1668 /* 1669 * Who makes up these funny rules? According to POSIX, 1670 * input baud rate is set equal to the output baud rate 1671 * when zero. 1672 */ 1673 if (t->c_ispeed == 0) 1674 t->c_ispeed = t->c_ospeed; 1675 1676 /* Discard any unsupported bits. */ 1677 t->c_iflag &= TTYSUP_IFLAG; 1678 t->c_oflag &= TTYSUP_OFLAG; 1679 t->c_lflag &= TTYSUP_LFLAG; 1680 t->c_cflag &= TTYSUP_CFLAG; 1681 1682 /* Set terminal flags through tcsetattr(). */ 1683 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1684 error = tty_drain(tp, 0); 1685 if (error) 1686 return (error); 1687 if (cmd == TIOCSETAF) 1688 tty_flush(tp, FREAD); 1689 } 1690 1691 /* 1692 * Only call param() when the flags really change. 1693 */ 1694 if ((t->c_cflag & CIGNORE) == 0 && 1695 (tp->t_termios.c_cflag != t->c_cflag || 1696 ((tp->t_termios.c_iflag ^ t->c_iflag) & 1697 (IXON|IXOFF|IXANY)) || 1698 tp->t_termios.c_ispeed != t->c_ispeed || 1699 tp->t_termios.c_ospeed != t->c_ospeed)) { 1700 error = ttydevsw_param(tp, t); 1701 if (error) 1702 return (error); 1703 1704 /* XXX: CLOCAL? */ 1705 1706 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE; 1707 tp->t_termios.c_ispeed = t->c_ispeed; 1708 tp->t_termios.c_ospeed = t->c_ospeed; 1709 1710 /* Baud rate has changed - update watermarks. */ 1711 error = tty_watermarks(tp); 1712 if (error) 1713 return (error); 1714 } 1715 1716 /* Copy new non-device driver parameters. */ 1717 tp->t_termios.c_iflag = t->c_iflag; 1718 tp->t_termios.c_oflag = t->c_oflag; 1719 tp->t_termios.c_lflag = t->c_lflag; 1720 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc); 1721 1722 ttydisc_optimize(tp); 1723 1724 if ((t->c_lflag & ICANON) == 0) { 1725 /* 1726 * When in non-canonical mode, wake up all 1727 * readers. Canonicalize any partial input. VMIN 1728 * and VTIME could also be adjusted. 1729 */ 1730 ttyinq_canonicalize(&tp->t_inq); 1731 tty_wakeup(tp, FREAD); 1732 } 1733 1734 /* 1735 * For packet mode: notify the PTY consumer that VSTOP 1736 * and VSTART may have been changed. 1737 */ 1738 if (tp->t_termios.c_iflag & IXON && 1739 tp->t_termios.c_cc[VSTOP] == CTRL('S') && 1740 tp->t_termios.c_cc[VSTART] == CTRL('Q')) 1741 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP); 1742 else 1743 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP); 1744 return (0); 1745 } 1746 case TIOCGETD: 1747 /* For compatibility - we only support TTYDISC. */ 1748 *(int *)data = TTYDISC; 1749 return (0); 1750 case TIOCGPGRP: 1751 if (!tty_is_ctty(tp, td->td_proc)) 1752 return (ENOTTY); 1753 1754 if (tp->t_pgrp != NULL) 1755 *(int *)data = tp->t_pgrp->pg_id; 1756 else 1757 *(int *)data = NO_PID; 1758 return (0); 1759 case TIOCGSID: 1760 if (!tty_is_ctty(tp, td->td_proc)) 1761 return (ENOTTY); 1762 1763 MPASS(tp->t_session); 1764 *(int *)data = tp->t_session->s_sid; 1765 return (0); 1766 case TIOCNOTTY: 1767 return (tty_drop_ctty(tp, td->td_proc)); 1768 case TIOCSCTTY: { 1769 struct proc *p = td->td_proc; 1770 1771 /* XXX: This looks awful. */ 1772 tty_unlock(tp); 1773 sx_xlock(&proctree_lock); 1774 tty_lock(tp); 1775 1776 if (!SESS_LEADER(p)) { 1777 /* Only the session leader may do this. */ 1778 sx_xunlock(&proctree_lock); 1779 return (EPERM); 1780 } 1781 1782 if (tp->t_session != NULL && tp->t_session == p->p_session) { 1783 /* This is already our controlling TTY. */ 1784 sx_xunlock(&proctree_lock); 1785 return (0); 1786 } 1787 1788 if (p->p_session->s_ttyp != NULL || 1789 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL && 1790 tp->t_session->s_ttyvp->v_type != VBAD)) { 1791 /* 1792 * There is already a relation between a TTY and 1793 * a session, or the caller is not the session 1794 * leader. 1795 * 1796 * Allow the TTY to be stolen when the vnode is 1797 * invalid, but the reference to the TTY is 1798 * still active. This allows immediate reuse of 1799 * TTYs of which the session leader has been 1800 * killed or the TTY revoked. 1801 */ 1802 sx_xunlock(&proctree_lock); 1803 return (EPERM); 1804 } 1805 1806 /* Connect the session to the TTY. */ 1807 tp->t_session = p->p_session; 1808 tp->t_session->s_ttyp = tp; 1809 tp->t_sessioncnt++; 1810 1811 /* Assign foreground process group. */ 1812 tp->t_pgrp = p->p_pgrp; 1813 PROC_LOCK(p); 1814 p->p_flag |= P_CONTROLT; 1815 PROC_UNLOCK(p); 1816 1817 sx_xunlock(&proctree_lock); 1818 return (0); 1819 } 1820 case TIOCSPGRP: { 1821 struct pgrp *pg; 1822 1823 /* 1824 * XXX: Temporarily unlock the TTY to locate the process 1825 * group. This code would be lot nicer if we would ever 1826 * decompose proctree_lock. 1827 */ 1828 tty_unlock(tp); 1829 sx_slock(&proctree_lock); 1830 pg = pgfind(*(int *)data); 1831 if (pg != NULL) 1832 PGRP_UNLOCK(pg); 1833 if (pg == NULL || pg->pg_session != td->td_proc->p_session) { 1834 sx_sunlock(&proctree_lock); 1835 tty_lock(tp); 1836 return (EPERM); 1837 } 1838 tty_lock(tp); 1839 1840 /* 1841 * Determine if this TTY is the controlling TTY after 1842 * relocking the TTY. 1843 */ 1844 if (!tty_is_ctty(tp, td->td_proc)) { 1845 sx_sunlock(&proctree_lock); 1846 return (ENOTTY); 1847 } 1848 tp->t_pgrp = pg; 1849 sx_sunlock(&proctree_lock); 1850 1851 /* Wake up the background process groups. */ 1852 cv_broadcast(&tp->t_bgwait); 1853 return (0); 1854 } 1855 case TIOCFLUSH: { 1856 int flags = *(int *)data; 1857 1858 if (flags == 0) 1859 flags = (FREAD|FWRITE); 1860 else 1861 flags &= (FREAD|FWRITE); 1862 tty_flush(tp, flags); 1863 return (0); 1864 } 1865 case TIOCDRAIN: 1866 /* Drain TTY output. */ 1867 return tty_drain(tp, 0); 1868 case TIOCGDRAINWAIT: 1869 *(int *)data = tp->t_drainwait; 1870 return (0); 1871 case TIOCSDRAINWAIT: 1872 error = priv_check(td, PRIV_TTY_DRAINWAIT); 1873 if (error == 0) 1874 tp->t_drainwait = *(int *)data; 1875 return (error); 1876 case TIOCCONS: 1877 /* Set terminal as console TTY. */ 1878 if (*(int *)data) { 1879 error = priv_check(td, PRIV_TTY_CONSOLE); 1880 if (error) 1881 return (error); 1882 1883 /* 1884 * XXX: constty should really need to be locked! 1885 * XXX: allow disconnected constty's to be stolen! 1886 */ 1887 1888 if (constty == tp) 1889 return (0); 1890 if (constty != NULL) 1891 return (EBUSY); 1892 1893 tty_unlock(tp); 1894 constty_set(tp); 1895 tty_lock(tp); 1896 } else if (constty == tp) { 1897 constty_clear(); 1898 } 1899 return (0); 1900 case TIOCGWINSZ: 1901 /* Obtain window size. */ 1902 *(struct winsize*)data = tp->t_winsize; 1903 return (0); 1904 case TIOCSWINSZ: 1905 /* Set window size. */ 1906 tty_set_winsize(tp, data); 1907 return (0); 1908 case TIOCEXCL: 1909 tp->t_flags |= TF_EXCLUDE; 1910 return (0); 1911 case TIOCNXCL: 1912 tp->t_flags &= ~TF_EXCLUDE; 1913 return (0); 1914 case TIOCSTOP: 1915 tp->t_flags |= TF_STOPPED; 1916 ttydevsw_pktnotify(tp, TIOCPKT_STOP); 1917 return (0); 1918 case TIOCSTART: 1919 tp->t_flags &= ~TF_STOPPED; 1920 ttydevsw_outwakeup(tp); 1921 ttydevsw_pktnotify(tp, TIOCPKT_START); 1922 return (0); 1923 case TIOCSTAT: 1924 tty_info(tp); 1925 return (0); 1926 case TIOCSTI: 1927 if ((fflag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI)) 1928 return (EPERM); 1929 if (!tty_is_ctty(tp, td->td_proc) && 1930 priv_check(td, PRIV_TTY_STI)) 1931 return (EACCES); 1932 ttydisc_rint(tp, *(char *)data, 0); 1933 ttydisc_rint_done(tp); 1934 return (0); 1935 } 1936 1937 #ifdef COMPAT_43TTY 1938 return tty_ioctl_compat(tp, cmd, data, fflag, td); 1939 #else /* !COMPAT_43TTY */ 1940 return (ENOIOCTL); 1941 #endif /* COMPAT_43TTY */ 1942 } 1943 1944 int 1945 tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, struct thread *td) 1946 { 1947 int error; 1948 1949 tty_lock_assert(tp, MA_OWNED); 1950 1951 if (tty_gone(tp)) 1952 return (ENXIO); 1953 1954 error = ttydevsw_ioctl(tp, cmd, data, td); 1955 if (error == ENOIOCTL) 1956 error = tty_generic_ioctl(tp, cmd, data, fflag, td); 1957 1958 return (error); 1959 } 1960 1961 dev_t 1962 tty_udev(struct tty *tp) 1963 { 1964 1965 if (tp->t_dev) 1966 return (dev2udev(tp->t_dev)); 1967 else 1968 return (NODEV); 1969 } 1970 1971 int 1972 tty_checkoutq(struct tty *tp) 1973 { 1974 1975 /* 256 bytes should be enough to print a log message. */ 1976 return (ttyoutq_bytesleft(&tp->t_outq) >= 256); 1977 } 1978 1979 void 1980 tty_hiwat_in_block(struct tty *tp) 1981 { 1982 1983 if ((tp->t_flags & TF_HIWAT_IN) == 0 && 1984 tp->t_termios.c_iflag & IXOFF && 1985 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) { 1986 /* 1987 * Input flow control. Only enter the high watermark when we 1988 * can successfully store the VSTOP character. 1989 */ 1990 if (ttyoutq_write_nofrag(&tp->t_outq, 1991 &tp->t_termios.c_cc[VSTOP], 1) == 0) 1992 tp->t_flags |= TF_HIWAT_IN; 1993 } else { 1994 /* No input flow control. */ 1995 tp->t_flags |= TF_HIWAT_IN; 1996 } 1997 } 1998 1999 void 2000 tty_hiwat_in_unblock(struct tty *tp) 2001 { 2002 2003 if (tp->t_flags & TF_HIWAT_IN && 2004 tp->t_termios.c_iflag & IXOFF && 2005 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) { 2006 /* 2007 * Input flow control. Only leave the high watermark when we 2008 * can successfully store the VSTART character. 2009 */ 2010 if (ttyoutq_write_nofrag(&tp->t_outq, 2011 &tp->t_termios.c_cc[VSTART], 1) == 0) 2012 tp->t_flags &= ~TF_HIWAT_IN; 2013 } else { 2014 /* No input flow control. */ 2015 tp->t_flags &= ~TF_HIWAT_IN; 2016 } 2017 2018 if (!tty_gone(tp)) 2019 ttydevsw_inwakeup(tp); 2020 } 2021 2022 /* 2023 * TTY hooks interface. 2024 */ 2025 2026 static int 2027 ttyhook_defrint(struct tty *tp, char c, int flags) 2028 { 2029 2030 if (ttyhook_rint_bypass(tp, &c, 1) != 1) 2031 return (-1); 2032 2033 return (0); 2034 } 2035 2036 int 2037 ttyhook_register(struct tty **rtp, struct proc *p, int fd, struct ttyhook *th, 2038 void *softc) 2039 { 2040 struct tty *tp; 2041 struct file *fp; 2042 struct cdev *dev; 2043 struct cdevsw *cdp; 2044 struct filedesc *fdp; 2045 cap_rights_t rights; 2046 int error, ref; 2047 2048 /* Validate the file descriptor. */ 2049 fdp = p->p_fd; 2050 error = fget_unlocked(fdp, fd, cap_rights_init(&rights, CAP_TTYHOOK), 2051 &fp, NULL); 2052 if (error != 0) 2053 return (error); 2054 if (fp->f_ops == &badfileops) { 2055 error = EBADF; 2056 goto done1; 2057 } 2058 2059 /* 2060 * Make sure the vnode is bound to a character device. 2061 * Unlocked check for the vnode type is ok there, because we 2062 * only shall prevent calling devvn_refthread on the file that 2063 * never has been opened over a character device. 2064 */ 2065 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) { 2066 error = EINVAL; 2067 goto done1; 2068 } 2069 2070 /* Make sure it is a TTY. */ 2071 cdp = devvn_refthread(fp->f_vnode, &dev, &ref); 2072 if (cdp == NULL) { 2073 error = ENXIO; 2074 goto done1; 2075 } 2076 if (dev != fp->f_data) { 2077 error = ENXIO; 2078 goto done2; 2079 } 2080 if (cdp != &ttydev_cdevsw) { 2081 error = ENOTTY; 2082 goto done2; 2083 } 2084 tp = dev->si_drv1; 2085 2086 /* Try to attach the hook to the TTY. */ 2087 error = EBUSY; 2088 tty_lock(tp); 2089 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0)); 2090 if (tp->t_flags & TF_HOOK) 2091 goto done3; 2092 2093 tp->t_flags |= TF_HOOK; 2094 tp->t_hook = th; 2095 tp->t_hooksoftc = softc; 2096 *rtp = tp; 2097 error = 0; 2098 2099 /* Maybe we can switch into bypass mode now. */ 2100 ttydisc_optimize(tp); 2101 2102 /* Silently convert rint() calls to rint_bypass() when possible. */ 2103 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass)) 2104 th->th_rint = ttyhook_defrint; 2105 2106 done3: tty_unlock(tp); 2107 done2: dev_relthread(dev, ref); 2108 done1: fdrop(fp, curthread); 2109 return (error); 2110 } 2111 2112 void 2113 ttyhook_unregister(struct tty *tp) 2114 { 2115 2116 tty_lock_assert(tp, MA_OWNED); 2117 MPASS(tp->t_flags & TF_HOOK); 2118 2119 /* Disconnect the hook. */ 2120 tp->t_flags &= ~TF_HOOK; 2121 tp->t_hook = NULL; 2122 2123 /* Maybe we need to leave bypass mode. */ 2124 ttydisc_optimize(tp); 2125 2126 /* Maybe deallocate the TTY as well. */ 2127 tty_rel_free(tp); 2128 } 2129 2130 /* 2131 * /dev/console handling. 2132 */ 2133 2134 static int 2135 ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 2136 { 2137 struct tty *tp; 2138 2139 /* System has no console device. */ 2140 if (dev_console_filename == NULL) 2141 return (ENXIO); 2142 2143 /* Look up corresponding TTY by device name. */ 2144 sx_slock(&tty_list_sx); 2145 TAILQ_FOREACH(tp, &tty_list, t_list) { 2146 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) { 2147 dev_console->si_drv1 = tp; 2148 break; 2149 } 2150 } 2151 sx_sunlock(&tty_list_sx); 2152 2153 /* System console has no TTY associated. */ 2154 if (dev_console->si_drv1 == NULL) 2155 return (ENXIO); 2156 2157 return (ttydev_open(dev, oflags, devtype, td)); 2158 } 2159 2160 static int 2161 ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag) 2162 { 2163 2164 log_console(uio); 2165 2166 return (ttydev_write(dev, uio, ioflag)); 2167 } 2168 2169 /* 2170 * /dev/console is a little different than normal TTY's. When opened, 2171 * it determines which TTY to use. When data gets written to it, it 2172 * will be logged in the kernel message buffer. 2173 */ 2174 static struct cdevsw ttyconsdev_cdevsw = { 2175 .d_version = D_VERSION, 2176 .d_open = ttyconsdev_open, 2177 .d_close = ttydev_close, 2178 .d_read = ttydev_read, 2179 .d_write = ttyconsdev_write, 2180 .d_ioctl = ttydev_ioctl, 2181 .d_kqfilter = ttydev_kqfilter, 2182 .d_poll = ttydev_poll, 2183 .d_mmap = ttydev_mmap, 2184 .d_name = "ttyconsdev", 2185 .d_flags = D_TTY, 2186 }; 2187 2188 static void 2189 ttyconsdev_init(void *unused __unused) 2190 { 2191 2192 dev_console = make_dev_credf(MAKEDEV_ETERNAL, &ttyconsdev_cdevsw, 0, 2193 NULL, UID_ROOT, GID_WHEEL, 0600, "console"); 2194 } 2195 2196 SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL); 2197 2198 void 2199 ttyconsdev_select(const char *name) 2200 { 2201 2202 dev_console_filename = name; 2203 } 2204 2205 /* 2206 * Debugging routines. 2207 */ 2208 2209 #include "opt_ddb.h" 2210 #ifdef DDB 2211 #include <ddb/ddb.h> 2212 #include <ddb/db_sym.h> 2213 2214 static const struct { 2215 int flag; 2216 char val; 2217 } ttystates[] = { 2218 #if 0 2219 { TF_NOPREFIX, 'N' }, 2220 #endif 2221 { TF_INITLOCK, 'I' }, 2222 { TF_CALLOUT, 'C' }, 2223 2224 /* Keep these together -> 'Oi' and 'Oo'. */ 2225 { TF_OPENED, 'O' }, 2226 { TF_OPENED_IN, 'i' }, 2227 { TF_OPENED_OUT, 'o' }, 2228 { TF_OPENED_CONS, 'c' }, 2229 2230 { TF_GONE, 'G' }, 2231 { TF_OPENCLOSE, 'B' }, 2232 { TF_ASYNC, 'Y' }, 2233 { TF_LITERAL, 'L' }, 2234 2235 /* Keep these together -> 'Hi' and 'Ho'. */ 2236 { TF_HIWAT, 'H' }, 2237 { TF_HIWAT_IN, 'i' }, 2238 { TF_HIWAT_OUT, 'o' }, 2239 2240 { TF_STOPPED, 'S' }, 2241 { TF_EXCLUDE, 'X' }, 2242 { TF_BYPASS, 'l' }, 2243 { TF_ZOMBIE, 'Z' }, 2244 { TF_HOOK, 's' }, 2245 2246 /* Keep these together -> 'bi' and 'bo'. */ 2247 { TF_BUSY, 'b' }, 2248 { TF_BUSY_IN, 'i' }, 2249 { TF_BUSY_OUT, 'o' }, 2250 2251 { 0, '\0'}, 2252 }; 2253 2254 #define TTY_FLAG_BITS \ 2255 "\2\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN" \ 2256 "\5OPENED_OUT\6OPENED_CONS\7GONE\10OPENCLOSE" \ 2257 "\11ASYNC\12LITERAL\13HIWAT_IN\14HIWAT_OUT" \ 2258 "\15STOPPED\16EXCLUDE\17BYPASS\20ZOMBIE" \ 2259 "\21HOOK\22BUSY_IN\23BUSY_OUT" 2260 2261 #define DB_PRINTSYM(name, addr) \ 2262 db_printf("%s " #name ": ", sep); \ 2263 db_printsym((db_addr_t) addr, DB_STGY_ANY); \ 2264 db_printf("\n"); 2265 2266 static void 2267 _db_show_devsw(const char *sep, const struct ttydevsw *tsw) 2268 { 2269 2270 db_printf("%sdevsw: ", sep); 2271 db_printsym((db_addr_t)tsw, DB_STGY_ANY); 2272 db_printf(" (%p)\n", tsw); 2273 DB_PRINTSYM(open, tsw->tsw_open); 2274 DB_PRINTSYM(close, tsw->tsw_close); 2275 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup); 2276 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup); 2277 DB_PRINTSYM(ioctl, tsw->tsw_ioctl); 2278 DB_PRINTSYM(param, tsw->tsw_param); 2279 DB_PRINTSYM(modem, tsw->tsw_modem); 2280 DB_PRINTSYM(mmap, tsw->tsw_mmap); 2281 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify); 2282 DB_PRINTSYM(free, tsw->tsw_free); 2283 } 2284 2285 static void 2286 _db_show_hooks(const char *sep, const struct ttyhook *th) 2287 { 2288 2289 db_printf("%shook: ", sep); 2290 db_printsym((db_addr_t)th, DB_STGY_ANY); 2291 db_printf(" (%p)\n", th); 2292 if (th == NULL) 2293 return; 2294 DB_PRINTSYM(rint, th->th_rint); 2295 DB_PRINTSYM(rint_bypass, th->th_rint_bypass); 2296 DB_PRINTSYM(rint_done, th->th_rint_done); 2297 DB_PRINTSYM(rint_poll, th->th_rint_poll); 2298 DB_PRINTSYM(getc_inject, th->th_getc_inject); 2299 DB_PRINTSYM(getc_capture, th->th_getc_capture); 2300 DB_PRINTSYM(getc_poll, th->th_getc_poll); 2301 DB_PRINTSYM(close, th->th_close); 2302 } 2303 2304 static void 2305 _db_show_termios(const char *name, const struct termios *t) 2306 { 2307 2308 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x " 2309 "lflag 0x%x ispeed %u ospeed %u\n", name, 2310 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag, 2311 t->c_ispeed, t->c_ospeed); 2312 } 2313 2314 /* DDB command to show TTY statistics. */ 2315 DB_SHOW_COMMAND(tty, db_show_tty) 2316 { 2317 struct tty *tp; 2318 2319 if (!have_addr) { 2320 db_printf("usage: show tty <addr>\n"); 2321 return; 2322 } 2323 tp = (struct tty *)addr; 2324 2325 db_printf("%p: %s\n", tp, tty_devname(tp)); 2326 db_printf("\tmtx: %p\n", tp->t_mtx); 2327 db_printf("\tflags: 0x%b\n", tp->t_flags, TTY_FLAG_BITS); 2328 db_printf("\trevokecnt: %u\n", tp->t_revokecnt); 2329 2330 /* Buffering mechanisms. */ 2331 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u " 2332 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin, 2333 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end, 2334 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota); 2335 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n", 2336 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end, 2337 tp->t_outq.to_nblocks, tp->t_outq.to_quota); 2338 db_printf("\tinlow: %zu\n", tp->t_inlow); 2339 db_printf("\toutlow: %zu\n", tp->t_outlow); 2340 _db_show_termios("\ttermios", &tp->t_termios); 2341 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n", 2342 tp->t_winsize.ws_row, tp->t_winsize.ws_col, 2343 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel); 2344 db_printf("\tcolumn: %u\n", tp->t_column); 2345 db_printf("\twritepos: %u\n", tp->t_writepos); 2346 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags); 2347 2348 /* Init/lock-state devices. */ 2349 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in); 2350 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out); 2351 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in); 2352 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out); 2353 2354 /* Hooks */ 2355 _db_show_devsw("\t", tp->t_devsw); 2356 _db_show_hooks("\t", tp->t_hook); 2357 2358 /* Process info. */ 2359 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp, 2360 tp->t_pgrp ? tp->t_pgrp->pg_id : 0, 2361 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0); 2362 db_printf("\tsession: %p", tp->t_session); 2363 if (tp->t_session != NULL) 2364 db_printf(" count %u leader %p tty %p sid %d login %s", 2365 tp->t_session->s_count, tp->t_session->s_leader, 2366 tp->t_session->s_ttyp, tp->t_session->s_sid, 2367 tp->t_session->s_login); 2368 db_printf("\n"); 2369 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt); 2370 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc); 2371 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc); 2372 db_printf("\tdev: %p\n", tp->t_dev); 2373 } 2374 2375 /* DDB command to list TTYs. */ 2376 DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys) 2377 { 2378 struct tty *tp; 2379 size_t isiz, osiz; 2380 int i, j; 2381 2382 /* Make the output look like `pstat -t'. */ 2383 db_printf("PTR "); 2384 #if defined(__LP64__) 2385 db_printf(" "); 2386 #endif 2387 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW " 2388 "COL SESS PGID STATE\n"); 2389 2390 TAILQ_FOREACH(tp, &tty_list, t_list) { 2391 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE; 2392 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE; 2393 2394 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d " 2395 "%5d ", tp, tty_devname(tp), isiz, 2396 tp->t_inq.ti_linestart - tp->t_inq.ti_begin, 2397 tp->t_inq.ti_end - tp->t_inq.ti_linestart, 2398 isiz - tp->t_inlow, osiz, 2399 tp->t_outq.to_end - tp->t_outq.to_begin, 2400 osiz - tp->t_outlow, MIN(tp->t_column, 99999), 2401 tp->t_session ? tp->t_session->s_sid : 0, 2402 tp->t_pgrp ? tp->t_pgrp->pg_id : 0); 2403 2404 /* Flag bits. */ 2405 for (i = j = 0; ttystates[i].flag; i++) 2406 if (tp->t_flags & ttystates[i].flag) { 2407 db_printf("%c", ttystates[i].val); 2408 j++; 2409 } 2410 if (j == 0) 2411 db_printf("-"); 2412 db_printf("\n"); 2413 } 2414 } 2415 #endif /* DDB */
Cache object: 78e3b2dd36d47bad05610dcde5f51859
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]