pty.c revision 173456
1/*- 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95 30 */ 31 32#include <sys/cdefs.h> 33__FBSDID("$FreeBSD: head/sys/kern/tty_pty.c 173456 2007-11-08 15:51:52Z jhb $"); 34 35/* 36 * Pseudo-teletype Driver 37 * (Actually two drivers, requiring two entries in 'cdevsw') 38 */ 39#include "opt_compat.h" 40#include "opt_tty.h" 41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/libkern.h> 44#include <sys/lock.h> 45#include <sys/mutex.h> 46#include <sys/sx.h> 47#if defined(COMPAT_43TTY) 48#include <sys/ioctl_compat.h> 49#endif 50#include <sys/priv.h> 51#include <sys/proc.h> 52#include <sys/tty.h> 53#include <sys/conf.h> 54#include <sys/fcntl.h> 55#include <sys/poll.h> 56#include <sys/kernel.h> 57#include <sys/uio.h> 58#include <sys/signalvar.h> 59#include <sys/malloc.h> 60 61static MALLOC_DEFINE(M_PTY, "ptys", "pty data structures"); 62 63static void ptsstart(struct tty *tp); 64static void ptsstop(struct tty *tp, int rw); 65static void ptcwakeup(struct tty *tp, int flag); 66static struct cdev *ptyinit(struct cdev *cdev, struct thread *td); 67 68static d_open_t ptsopen; 69static d_close_t ptsclose; 70static d_read_t ptsread; 71static d_write_t ptswrite; 72static d_ioctl_t ptsioctl; 73static d_open_t ptcopen; 74static d_close_t ptcclose; 75static d_read_t ptcread; 76static d_ioctl_t ptcioctl; 77static d_write_t ptcwrite; 78static d_poll_t ptcpoll; 79 80static struct cdevsw pts_cdevsw = { 81 .d_version = D_VERSION, 82 .d_open = ptsopen, 83 .d_close = ptsclose, 84 .d_read = ptsread, 85 .d_write = ptswrite, 86 .d_ioctl = ptsioctl, 87 .d_name = "pts", 88 .d_flags = D_TTY | D_NEEDGIANT, 89}; 90 91static struct cdevsw ptc_cdevsw = { 92 .d_version = D_VERSION, 93 .d_open = ptcopen, 94 .d_close = ptcclose, 95 .d_read = ptcread, 96 .d_write = ptcwrite, 97 .d_ioctl = ptcioctl, 98 .d_poll = ptcpoll, 99 .d_name = "ptc", 100 .d_flags = D_TTY | D_NEEDGIANT, 101}; 102 103#define BUFSIZ 100 /* Chunk size iomoved to/from user */ 104 105struct ptsc { 106 int pt_flags; 107 struct selinfo pt_selr, pt_selw; 108 u_char pt_send; 109 u_char pt_ucntl; 110 struct tty *pt_tty; 111 struct cdev *devs, *devc; 112 int pt_devs_open, pt_devc_open; 113 struct prison *pt_prison; 114}; 115 116#define PF_PKT 0x08 /* packet mode */ 117#define PF_STOPPED 0x10 /* user told stopped */ 118#define PF_NOSTOP 0x40 119#define PF_UCNTL 0x80 /* user control mode */ 120 121#define TSA_PTC_READ(tp) ((void *)&(tp)->t_outq.c_cf) 122#define TSA_PTC_WRITE(tp) ((void *)&(tp)->t_rawq.c_cl) 123#define TSA_PTS_READ(tp) ((void *)&(tp)->t_canq) 124 125static char *names = "pqrsPQRS"; 126/* 127 * This function creates and initializes a pts/ptc pair 128 * 129 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 130 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 131 */ 132static struct cdev * 133ptyinit(struct cdev *devc, struct thread *td) 134{ 135 struct ptsc *pt; 136 int n; 137 138 n = minor2unit(minor(devc)); 139 140 /* We only allow for up to 32 ptys per char in "names". */ 141 if (n >= 32 * strlen(names)) 142 return (NULL); 143 144 devc->si_flags &= ~SI_CHEAPCLONE; 145 146 /* 147 * Initially do not create a slave endpoint. 148 */ 149 pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO); 150 pt->devc = devc; 151 152 pt->pt_tty = ttyalloc(); 153 pt->pt_tty->t_sc = pt; 154 devc->si_drv1 = pt; 155 devc->si_tty = pt->pt_tty; 156 return (devc); 157} 158 159static void 160pty_create_slave(struct ucred *cred, struct ptsc *pt, int n) 161{ 162 163 pt->devs = make_dev_cred(&pts_cdevsw, n, cred, UID_ROOT, GID_WHEEL, 164 0666, "tty%c%r", names[n / 32], n % 32); 165 pt->devs->si_drv1 = pt; 166 pt->devs->si_tty = pt->pt_tty; 167 pt->pt_tty->t_dev = pt->devs; 168} 169 170static void 171pty_destroy_slave(struct ptsc *pt) 172{ 173 174 if (pt->pt_tty->t_refcnt > 1) 175 return; 176 pt->pt_tty->t_dev = NULL; 177 ttyrel(pt->pt_tty); 178 pt->pt_tty = NULL; 179 destroy_dev(pt->devs); 180 pt->devs = NULL; 181} 182 183static void 184pty_maybe_destroy_slave(struct ptsc *pt) 185{ 186 187 /* 188 * vfs bugs and complications near revoke() make 189 * it currently impossible to destroy struct cdev 190 */ 191 if (0 && pt->pt_devc_open == 0 && pt->pt_devs_open == 0) 192 pty_destroy_slave(pt); 193} 194 195/*ARGSUSED*/ 196static int 197ptsopen(struct cdev *dev, int flag, int devtype, struct thread *td) 198{ 199 struct tty *tp; 200 int error; 201 struct ptsc *pt; 202 203 if (!dev->si_drv1) 204 return(ENXIO); 205 pt = dev->si_drv1; 206 tp = dev->si_tty; 207 208 if ((tp->t_state & TS_ISOPEN) == 0) { 209 ttyinitmode(tp, 1, 0); 210 } else if (tp->t_state & TS_XCLUDE && priv_check(td, 211 PRIV_TTY_EXCLUSIVE)) 212 return (EBUSY); 213 else if (pt->pt_prison != td->td_ucred->cr_prison && 214 priv_check(td, PRIV_TTY_PRISON)) 215 return (EBUSY); 216 if (tp->t_oproc) /* Ctrlr still around. */ 217 (void)ttyld_modem(tp, 1); 218 while ((tp->t_state & TS_CARR_ON) == 0) { 219 if (flag&FNONBLOCK) 220 break; 221 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 222 "ptsopn", 0); 223 if (error) 224 return (error); 225 } 226 error = ttyld_open(tp, dev); 227 if (error == 0) { 228 ptcwakeup(tp, FREAD|FWRITE); 229 pt->pt_devs_open = 1; 230 } else 231 pty_maybe_destroy_slave(pt); 232 return (error); 233} 234 235static int 236ptsclose(struct cdev *dev, int flag, int mode, struct thread *td) 237{ 238 struct ptsc *pti; 239 struct tty *tp; 240 int err; 241 242 tp = dev->si_tty; 243 pti = dev->si_drv1; 244 245 KASSERT(dev == pti->devs, ("ptsclose: dev != pti->devs")); 246 247 err = ttyld_close(tp, flag); 248 (void) tty_close(tp); 249 250 pti->pt_devs_open = 0; 251 pty_maybe_destroy_slave(pti); 252 253 return (err); 254} 255 256static int 257ptsread(struct cdev *dev, struct uio *uio, int flag) 258{ 259 struct tty *tp = dev->si_tty; 260 int error = 0; 261 262 if (tp->t_oproc) 263 error = ttyld_read(tp, uio, flag); 264 ptcwakeup(tp, FWRITE); 265 return (error); 266} 267 268/* 269 * Write to pseudo-tty. 270 * Wakeups of controlling tty will happen 271 * indirectly, when tty driver calls ptsstart. 272 */ 273static int 274ptswrite(struct cdev *dev, struct uio *uio, int flag) 275{ 276 struct tty *tp; 277 278 tp = dev->si_tty; 279 if (tp->t_oproc == 0) 280 return (EIO); 281 return (ttyld_write(tp, uio, flag)); 282} 283 284/* 285 * Start output on pseudo-tty. 286 * Wake up process selecting or sleeping for input from controlling tty. 287 */ 288static void 289ptsstart(struct tty *tp) 290{ 291 struct ptsc *pt = tp->t_sc; 292 293 if (tp->t_state & TS_TTSTOP) 294 return; 295 if (pt->pt_flags & PF_STOPPED) { 296 pt->pt_flags &= ~PF_STOPPED; 297 pt->pt_send = TIOCPKT_START; 298 } 299 ptcwakeup(tp, FREAD); 300} 301 302static void 303ptcwakeup(struct tty *tp, int flag) 304{ 305 struct ptsc *pt = tp->t_sc; 306 307 if (flag & FREAD) { 308 selwakeuppri(&pt->pt_selr, TTIPRI); 309 wakeup(TSA_PTC_READ(tp)); 310 } 311 if (flag & FWRITE) { 312 selwakeuppri(&pt->pt_selw, TTOPRI); 313 wakeup(TSA_PTC_WRITE(tp)); 314 } 315} 316 317static int 318ptcopen(struct cdev *dev, int flag, int devtype, struct thread *td) 319{ 320 struct tty *tp; 321 struct ptsc *pt; 322 323 if (!dev->si_drv1) 324 ptyinit(dev, td); 325 if (!dev->si_drv1) 326 return(ENXIO); 327 328 pt = dev->si_drv1; 329 /* 330 * In case we have destroyed the struct tty at the last connect time, 331 * we need to recreate it. 332 */ 333 if (pt->pt_tty == NULL) { 334 pt->pt_tty = ttyalloc(); 335 pt->pt_tty->t_sc = pt; 336 dev->si_tty = pt->pt_tty; 337 } 338 tp = dev->si_tty; 339 340 if (tp->t_oproc) 341 return (EIO); 342 tp->t_timeout = -1; 343 tp->t_oproc = ptsstart; 344 tp->t_stop = ptsstop; 345 (void)ttyld_modem(tp, 1); 346 tp->t_lflag &= ~EXTPROC; 347 pt->pt_prison = td->td_ucred->cr_prison; 348 pt->pt_flags = 0; 349 pt->pt_send = 0; 350 pt->pt_ucntl = 0; 351 352 if (!pt->devs) 353 pty_create_slave(td->td_ucred, pt, minor(dev)); 354 pt->pt_devc_open = 1; 355 356 return (0); 357} 358 359static int 360ptcclose(struct cdev *dev, int flags, int fmt, struct thread *td) 361{ 362 struct ptsc *pti = dev->si_drv1; 363 struct tty *tp; 364 365 tp = dev->si_tty; 366 (void)ttyld_modem(tp, 0); 367 368 /* 369 * XXX MDMBUF makes no sense for ptys but would inhibit the above 370 * l_modem(). CLOCAL makes sense but isn't supported. Special 371 * l_modem()s that ignore carrier drop make no sense for ptys but 372 * may be in use because other parts of the line discipline make 373 * sense for ptys. Recover by doing everything that a normal 374 * ttymodem() would have done except for sending a SIGHUP. 375 */ 376 if (tp->t_state & TS_ISOPEN) { 377 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 378 tp->t_state |= TS_ZOMBIE; 379 ttyflush(tp, FREAD | FWRITE); 380 } 381 382 tp->t_oproc = 0; /* mark closed */ 383 pti->pt_devc_open = 0; 384 pty_maybe_destroy_slave(pti); 385 return (0); 386} 387 388static int 389ptcread(struct cdev *dev, struct uio *uio, int flag) 390{ 391 struct tty *tp = dev->si_tty; 392 struct ptsc *pt = dev->si_drv1; 393 char buf[BUFSIZ]; 394 int error = 0, cc; 395 396 /* 397 * We want to block until the slave 398 * is open, and there's something to read; 399 * but if we lost the slave or we're NBIO, 400 * then return the appropriate error instead. 401 */ 402 for (;;) { 403 if (tp->t_state&TS_ISOPEN) { 404 if (pt->pt_flags&PF_PKT && pt->pt_send) { 405 error = ureadc((int)pt->pt_send, uio); 406 if (error) 407 return (error); 408 if (pt->pt_send & TIOCPKT_IOCTL) { 409 cc = min(uio->uio_resid, 410 sizeof(tp->t_termios)); 411 uiomove(&tp->t_termios, cc, uio); 412 } 413 pt->pt_send = 0; 414 return (0); 415 } 416 if (pt->pt_flags&PF_UCNTL && pt->pt_ucntl) { 417 error = ureadc((int)pt->pt_ucntl, uio); 418 if (error) 419 return (error); 420 pt->pt_ucntl = 0; 421 return (0); 422 } 423 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 424 break; 425 } 426 if ((tp->t_state & TS_CONNECTED) == 0) 427 return (0); /* EOF */ 428 if (flag & O_NONBLOCK) 429 return (EWOULDBLOCK); 430 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 431 if (error) 432 return (error); 433 } 434 if (pt->pt_flags & (PF_PKT|PF_UCNTL)) 435 error = ureadc(0, uio); 436 while (uio->uio_resid > 0 && error == 0) { 437 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 438 if (cc <= 0) 439 break; 440 error = uiomove(buf, cc, uio); 441 } 442 ttwwakeup(tp); 443 return (error); 444} 445 446static void 447ptsstop(struct tty *tp, int flush) 448{ 449 struct ptsc *pt = tp->t_sc; 450 int flag; 451 452 /* note: FLUSHREAD and FLUSHWRITE already ok */ 453 if (flush == 0) { 454 flush = TIOCPKT_STOP; 455 pt->pt_flags |= PF_STOPPED; 456 } else 457 pt->pt_flags &= ~PF_STOPPED; 458 pt->pt_send |= flush; 459 /* change of perspective */ 460 flag = 0; 461 if (flush & FREAD) 462 flag |= FWRITE; 463 if (flush & FWRITE) 464 flag |= FREAD; 465 ptcwakeup(tp, flag); 466} 467 468static int 469ptcpoll(struct cdev *dev, int events, struct thread *td) 470{ 471 struct tty *tp = dev->si_tty; 472 struct ptsc *pt = dev->si_drv1; 473 int revents = 0; 474 int s; 475 476 if ((tp->t_state & TS_CONNECTED) == 0) 477 return (events & 478 (POLLHUP | POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM)); 479 480 /* 481 * Need to block timeouts (ttrstart). 482 */ 483 s = spltty(); 484 485 if (events & (POLLIN | POLLRDNORM)) 486 if ((tp->t_state & TS_ISOPEN) && 487 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || 488 ((pt->pt_flags & PF_PKT) && pt->pt_send) || 489 ((pt->pt_flags & PF_UCNTL) && pt->pt_ucntl))) 490 revents |= events & (POLLIN | POLLRDNORM); 491 492 if (events & (POLLOUT | POLLWRNORM)) 493 if (tp->t_state & TS_ISOPEN && 494 (((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 495 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) 496 revents |= events & (POLLOUT | POLLWRNORM); 497 498 if (events & POLLHUP) 499 if ((tp->t_state & TS_CARR_ON) == 0) 500 revents |= POLLHUP; 501 502 if (revents == 0) { 503 if (events & (POLLIN | POLLRDNORM)) 504 selrecord(td, &pt->pt_selr); 505 506 if (events & (POLLOUT | POLLWRNORM)) 507 selrecord(td, &pt->pt_selw); 508 } 509 splx(s); 510 511 return (revents); 512} 513 514static int 515ptcwrite(struct cdev *dev, struct uio *uio, int flag) 516{ 517 struct tty *tp = dev->si_tty; 518 u_char *cp = 0; 519 int cc = 0; 520 u_char locbuf[BUFSIZ]; 521 int cnt = 0; 522 int error = 0; 523 524again: 525 if ((tp->t_state&TS_ISOPEN) == 0) 526 goto block; 527 while (uio->uio_resid > 0 || cc > 0) { 528 if (cc == 0) { 529 cc = min(uio->uio_resid, BUFSIZ); 530 cp = locbuf; 531 error = uiomove(cp, cc, uio); 532 if (error) 533 return (error); 534 /* check again for safety */ 535 if ((tp->t_state & TS_ISOPEN) == 0) { 536 /* adjust for data copied in but not written */ 537 uio->uio_resid += cc; 538 return (EIO); 539 } 540 } 541 while (cc > 0) { 542 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 543 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) { 544 wakeup(TSA_HUP_OR_INPUT(tp)); 545 goto block; 546 } 547 ttyld_rint(tp, *cp++); 548 cnt++; 549 cc--; 550 } 551 cc = 0; 552 } 553 return (0); 554block: 555 /* 556 * Come here to wait for slave to open, for space 557 * in outq, or space in rawq, or an empty canq. 558 */ 559 if ((tp->t_state & TS_CONNECTED) == 0) { 560 /* adjust for data copied in but not written */ 561 uio->uio_resid += cc; 562 return (EIO); 563 } 564 if (flag & O_NONBLOCK) { 565 /* adjust for data copied in but not written */ 566 uio->uio_resid += cc; 567 if (cnt == 0) 568 return (EWOULDBLOCK); 569 return (0); 570 } 571 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); 572 if (error) { 573 /* adjust for data copied in but not written */ 574 uio->uio_resid += cc; 575 return (error); 576 } 577 goto again; 578} 579 580/*ARGSUSED*/ 581static int 582ptcioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 583{ 584 struct tty *tp = dev->si_tty; 585 struct ptsc *pt = dev->si_drv1; 586#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \ 587 defined(COMPAT_FREEBSD4) || defined(COMPAT_43) 588 int ival; 589#endif 590 591 switch (cmd) { 592 593 case TIOCGPGRP: 594 /* 595 * We avoid calling ttioctl on the controller since, 596 * in that case, tp must be the controlling terminal. 597 */ 598 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 599 return (0); 600 601 case TIOCPKT: 602 if (*(int *)data) { 603 if (pt->pt_flags & PF_UCNTL) 604 return (EINVAL); 605 pt->pt_flags |= PF_PKT; 606 } else 607 pt->pt_flags &= ~PF_PKT; 608 return (0); 609 610 case TIOCUCNTL: 611 if (*(int *)data) { 612 if (pt->pt_flags & PF_PKT) 613 return (EINVAL); 614 pt->pt_flags |= PF_UCNTL; 615 } else 616 pt->pt_flags &= ~PF_UCNTL; 617 return (0); 618 } 619 620 /* 621 * The rest of the ioctls shouldn't be called until 622 * the slave is open. 623 */ 624 if ((tp->t_state & TS_ISOPEN) == 0) 625 return (EAGAIN); 626 627 switch (cmd) { 628#ifdef COMPAT_43TTY 629 case TIOCSETP: 630 case TIOCSETN: 631#endif 632 case TIOCSETD: 633 case TIOCSETA: 634 case TIOCSETAW: 635 case TIOCSETAF: 636 /* 637 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 638 * ttywflush(tp) will hang if there are characters in 639 * the outq. 640 */ 641 ndflush(&tp->t_outq, tp->t_outq.c_cc); 642 break; 643 644#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \ 645 defined(COMPAT_FREEBSD4) || defined(COMPAT_43) 646 case _IO('t', 95): 647 ival = IOCPARM_IVAL(data); 648 data = (caddr_t)&ival; 649 /* FALLTHROUGH */ 650#endif 651 case TIOCSIG: 652 if (*(unsigned int *)data >= NSIG || 653 *(unsigned int *)data == 0) 654 return(EINVAL); 655 if ((tp->t_lflag&NOFLSH) == 0) 656 ttyflush(tp, FREAD|FWRITE); 657 if (tp->t_pgrp != NULL) { 658 PGRP_LOCK(tp->t_pgrp); 659 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 660 PGRP_UNLOCK(tp->t_pgrp); 661 } 662 if ((*(unsigned int *)data == SIGINFO) && 663 ((tp->t_lflag&NOKERNINFO) == 0)) 664 ttyinfo(tp); 665 return(0); 666 } 667 668 return (ptsioctl(dev, cmd, data, flag, td)); 669} 670 671/*ARGSUSED*/ 672static int 673ptsioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 674{ 675 struct tty *tp = dev->si_tty; 676 struct ptsc *pt = dev->si_drv1; 677 u_char *cc = tp->t_cc; 678 int stop, error; 679 680 if (cmd == TIOCEXT) { 681 /* 682 * When the EXTPROC bit is being toggled, we need 683 * to send an TIOCPKT_IOCTL if the packet driver 684 * is turned on. 685 */ 686 if (*(int *)data) { 687 if (pt->pt_flags & PF_PKT) { 688 pt->pt_send |= TIOCPKT_IOCTL; 689 ptcwakeup(tp, FREAD); 690 } 691 tp->t_lflag |= EXTPROC; 692 } else { 693 if ((tp->t_lflag & EXTPROC) && 694 (pt->pt_flags & PF_PKT)) { 695 pt->pt_send |= TIOCPKT_IOCTL; 696 ptcwakeup(tp, FREAD); 697 } 698 tp->t_lflag &= ~EXTPROC; 699 } 700 return(0); 701 } 702 error = ttyioctl(dev, cmd, data, flag, td); 703 if (error == ENOTTY) { 704 if (pt->pt_flags & PF_UCNTL && 705 (cmd & ~0xff) == UIOCCMD(0)) { 706 if (cmd & 0xff) { 707 pt->pt_ucntl = (u_char)cmd; 708 ptcwakeup(tp, FREAD); 709 } 710 return (0); 711 } 712 error = ENOTTY; 713 } 714 /* 715 * If external processing and packet mode send ioctl packet. 716 */ 717 if ((tp->t_lflag&EXTPROC) && (pt->pt_flags & PF_PKT)) { 718 switch(cmd) { 719 case TIOCSETA: 720 case TIOCSETAW: 721 case TIOCSETAF: 722#ifdef COMPAT_43TTY 723 case TIOCSETP: 724 case TIOCSETN: 725 case TIOCSETC: 726 case TIOCSLTC: 727 case TIOCLBIS: 728 case TIOCLBIC: 729 case TIOCLSET: 730#endif 731 pt->pt_send |= TIOCPKT_IOCTL; 732 ptcwakeup(tp, FREAD); 733 break; 734 default: 735 break; 736 } 737 } 738 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 739 && CCEQ(cc[VSTART], CTRL('q')); 740 if (pt->pt_flags & PF_NOSTOP) { 741 if (stop) { 742 pt->pt_send &= ~TIOCPKT_NOSTOP; 743 pt->pt_send |= TIOCPKT_DOSTOP; 744 pt->pt_flags &= ~PF_NOSTOP; 745 ptcwakeup(tp, FREAD); 746 } 747 } else { 748 if (!stop) { 749 pt->pt_send &= ~TIOCPKT_DOSTOP; 750 pt->pt_send |= TIOCPKT_NOSTOP; 751 pt->pt_flags |= PF_NOSTOP; 752 ptcwakeup(tp, FREAD); 753 } 754 } 755 return (error); 756} 757 758static void 759pty_clone(void *arg, struct ucred *cr, char *name, int namelen, 760 struct cdev **dev) 761{ 762 char *cp; 763 int u; 764 765 if (*dev != NULL) 766 return; 767 if (bcmp(name, "pty", 3) != 0) 768 return; 769 if (name[5] != '\0' || name[3] == '\0') 770 return; 771 cp = index(names, name[3]); 772 if (cp == NULL) 773 return; 774 u = (cp - names) * 32; 775 if (name[4] >= '0' && name[4] <= '9') 776 u += name[4] - '0'; 777 else if (name[4] >= 'a' && name[4] <= 'v') 778 u += name[4] - 'a' + 10; 779 else 780 return; 781 *dev = make_dev_credf(MAKEDEV_REF, &ptc_cdevsw, unit2minor(u), cr, 782 UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32); 783 (*dev)->si_flags |= SI_CHEAPCLONE; 784 return; 785} 786 787static void 788ptc_drvinit(void *unused) 789{ 790 791 EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000); 792} 793 794SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,ptc_drvinit,NULL) 795