1 /* $NetBSD: tty_pty.c,v 1.105 2007/12/05 17:19:58 pooka Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95 32 */ 33 34 /* 35 * Pseudo-teletype Driver 36 * (Actually two drivers, requiring two entries in 'cdevsw') 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: tty_pty.c,v 1.105 2007/12/05 17:19:58 pooka Exp $"); 41 42 #include "opt_compat_sunos.h" 43 #include "opt_ptm.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/ioctl.h> 48 #include <sys/proc.h> 49 #include <sys/tty.h> 50 #include <sys/stat.h> 51 #include <sys/file.h> 52 #include <sys/kernel.h> 53 #include <sys/vnode.h> 54 #include <sys/namei.h> 55 #include <sys/signalvar.h> 56 #include <sys/uio.h> 57 #include <sys/filedesc.h> 58 #include <sys/conf.h> 59 #include <sys/poll.h> 60 #include <sys/malloc.h> 61 #include <sys/pty.h> 62 #include <sys/kauth.h> 63 64 #define DEFAULT_NPTYS 16 /* default number of initial ptys */ 65 #define DEFAULT_MAXPTYS 992 /* default maximum number of ptys */ 66 67 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 68 69 struct pt_softc { 70 struct tty *pt_tty; 71 int pt_flags; 72 struct selinfo pt_selr, pt_selw; 73 u_char pt_send; 74 u_char pt_ucntl; 75 }; 76 77 static struct pt_softc **pt_softc = NULL; /* pty array */ 78 static int maxptys = DEFAULT_MAXPTYS; /* maximum number of ptys (sysctable) */ 79 kmutex_t pt_softc_mutex; 80 int npty = 0; /* for pstat -t */ 81 82 #define PF_PKT 0x08 /* packet mode */ 83 #define PF_STOPPED 0x10 /* user told stopped */ 84 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 85 #define PF_NOSTOP 0x40 86 #define PF_UCNTL 0x80 /* user control mode */ 87 88 void ptyattach(int); 89 void ptcwakeup(struct tty *, int); 90 void ptsstart(struct tty *); 91 int pty_maxptys(int, int); 92 93 static struct pt_softc **ptyarralloc(int); 94 95 dev_type_open(ptcopen); 96 dev_type_close(ptcclose); 97 dev_type_read(ptcread); 98 dev_type_write(ptcwrite); 99 dev_type_poll(ptcpoll); 100 dev_type_kqfilter(ptckqfilter); 101 102 dev_type_open(ptsopen); 103 dev_type_close(ptsclose); 104 dev_type_read(ptsread); 105 dev_type_write(ptswrite); 106 dev_type_stop(ptsstop); 107 dev_type_poll(ptspoll); 108 109 dev_type_ioctl(ptyioctl); 110 dev_type_tty(ptytty); 111 112 const struct cdevsw ptc_cdevsw = { 113 ptcopen, ptcclose, ptcread, ptcwrite, ptyioctl, 114 nullstop, ptytty, ptcpoll, nommap, ptckqfilter, D_TTY 115 }; 116 117 const struct cdevsw pts_cdevsw = { 118 ptsopen, ptsclose, ptsread, ptswrite, ptyioctl, 119 ptsstop, ptytty, ptspoll, nommap, ttykqfilter, D_TTY 120 }; 121 122 #if defined(pmax) 123 const struct cdevsw ptc_ultrix_cdevsw = { 124 ptcopen, ptcclose, ptcread, ptcwrite, ptyioctl, 125 nullstop, ptytty, ptcpoll, nommap, ptckqfilter, D_TTY 126 }; 127 128 const struct cdevsw pts_ultrix_cdevsw = { 129 ptsopen, ptsclose, ptsread, ptswrite, ptyioctl, 130 ptsstop, ptytty, ptspoll, nommap, ttykqfilter, D_TTY 131 }; 132 #endif /* defined(pmax) */ 133 134 /* 135 * Check if a pty is free to use. 136 */ 137 int 138 pty_isfree(int minor, int lock) 139 { 140 struct pt_softc *pt = pt_softc[minor]; 141 if (lock) 142 mutex_enter(&pt_softc_mutex); 143 minor = pt == NULL || pt->pt_tty == NULL || 144 pt->pt_tty->t_oproc == NULL; 145 if (lock) 146 mutex_exit(&pt_softc_mutex); 147 return minor; 148 } 149 150 /* 151 * Allocate and zero array of nelem elements. 152 */ 153 static struct pt_softc ** 154 ptyarralloc(nelem) 155 int nelem; 156 { 157 struct pt_softc **pt; 158 nelem += 10; 159 pt = malloc(nelem * sizeof *pt, M_DEVBUF, M_WAITOK | M_ZERO); 160 return pt; 161 } 162 163 /* 164 * Check if the minor is correct and ensure necessary structures 165 * are properly allocated. 166 */ 167 int 168 pty_check(int ptn) 169 { 170 struct pt_softc *pti; 171 172 if (ptn >= npty) { 173 struct pt_softc **newpt, **oldpt; 174 int newnpty; 175 176 /* check if the requested pty can be granted */ 177 if (ptn >= maxptys) { 178 limit_reached: 179 tablefull("pty", "increase kern.maxptys"); 180 return (ENXIO); 181 } 182 183 /* Allocate a larger pty array */ 184 for (newnpty = npty; newnpty <= ptn;) 185 newnpty *= 2; 186 if (newnpty > maxptys) 187 newnpty = maxptys; 188 newpt = ptyarralloc(newnpty); 189 190 /* 191 * Now grab the pty array mutex - we need to ensure 192 * that the pty array is consistent while copying it's 193 * content to newly allocated, larger space; we also 194 * need to be safe against pty_maxptys(). 195 */ 196 mutex_enter(&pt_softc_mutex); 197 198 if (newnpty >= maxptys) { 199 /* limit cut away beneath us... */ 200 newnpty = maxptys; 201 if (ptn >= newnpty) { 202 mutex_exit(&pt_softc_mutex); 203 free(newpt, M_DEVBUF); 204 goto limit_reached; 205 } 206 } 207 208 /* 209 * If the pty array was not enlarged while we were waiting 210 * for mutex, copy current contents of pt_softc[] to newly 211 * allocated array and start using the new bigger array. 212 */ 213 if (newnpty > npty) { 214 memcpy(newpt, pt_softc, npty*sizeof(struct pt_softc *)); 215 oldpt = pt_softc; 216 pt_softc = newpt; 217 npty = newnpty; 218 } else { 219 /* was enlarged when waited for lock, free new space */ 220 oldpt = newpt; 221 } 222 223 mutex_exit(&pt_softc_mutex); 224 free(oldpt, M_DEVBUF); 225 } 226 227 /* 228 * If the entry is not yet allocated, allocate one. The mutex is 229 * needed so that the state of pt_softc[] array is consistant 230 * in case it has been lengthened above. 231 */ 232 if (!pt_softc[ptn]) { 233 MALLOC(pti, struct pt_softc *, sizeof(struct pt_softc), 234 M_DEVBUF, M_WAITOK); 235 memset(pti, 0, sizeof(struct pt_softc)); 236 237 pti->pt_tty = ttymalloc(); 238 239 mutex_enter(&pt_softc_mutex); 240 241 /* 242 * Check the entry again - it might have been 243 * added while we were waiting for mutex. 244 */ 245 if (!pt_softc[ptn]) { 246 tty_attach(pti->pt_tty); 247 pt_softc[ptn] = pti; 248 } else { 249 ttyfree(pti->pt_tty); 250 free(pti, M_DEVBUF); 251 } 252 253 mutex_exit(&pt_softc_mutex); 254 } 255 256 return (0); 257 } 258 259 /* 260 * Set maxpty in thread-safe way. Returns 0 in case of error, otherwise 261 * new value of maxptys. 262 */ 263 int 264 pty_maxptys(newmax, set) 265 int newmax, set; 266 { 267 if (!set) 268 return (maxptys); 269 270 /* 271 * We have to grab the pt_softc lock, so that we would pick correct 272 * value of npty (might be modified in pty_check()). 273 */ 274 mutex_enter(&pt_softc_mutex); 275 276 /* 277 * The value cannot be set to value lower than the highest pty 278 * number ever allocated. 279 */ 280 if (newmax >= npty) 281 maxptys = newmax; 282 else 283 newmax = 0; 284 285 mutex_exit(&pt_softc_mutex); 286 287 return newmax; 288 } 289 290 /* 291 * Establish n (or default if n is 1) ptys in the system. 292 */ 293 void 294 ptyattach(n) 295 int n; 296 { 297 298 mutex_init(&pt_softc_mutex, MUTEX_DEFAULT, IPL_NONE); 299 300 /* maybe should allow 0 => none? */ 301 if (n <= 1) 302 n = DEFAULT_NPTYS; 303 pt_softc = ptyarralloc(n); 304 npty = n; 305 #ifndef NO_DEV_PTM 306 ptmattach(1); 307 #endif 308 } 309 310 /*ARGSUSED*/ 311 int 312 ptsopen(dev_t dev, int flag, int devtype, struct lwp *l) 313 { 314 struct pt_softc *pti; 315 struct tty *tp; 316 int error; 317 int ptn = minor(dev); 318 319 if ((error = pty_check(ptn)) != 0) 320 return (error); 321 322 mutex_spin_enter(&tty_lock); 323 pti = pt_softc[ptn]; 324 tp = pti->pt_tty; 325 if (!ISSET(tp->t_state, TS_ISOPEN)) { 326 ttychars(tp); /* Set up default chars */ 327 tp->t_iflag = TTYDEF_IFLAG; 328 tp->t_oflag = TTYDEF_OFLAG; 329 tp->t_lflag = TTYDEF_LFLAG; 330 tp->t_cflag = TTYDEF_CFLAG; 331 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 332 ttsetwater(tp); /* would be done in xxparam() */ 333 } else if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, 334 tp) != 0) { 335 mutex_spin_exit(&tty_lock); 336 return (EBUSY); 337 } 338 if (tp->t_oproc) /* Ctrlr still around. */ 339 SET(tp->t_state, TS_CARR_ON); 340 if (!ISSET(flag, O_NONBLOCK)) { 341 while (!ISSET(tp->t_state, TS_CARR_ON)) { 342 tp->t_wopen++; 343 error = ttysleep(tp, &tp->t_rawq.c_cv, true, 0); 344 tp->t_wopen--; 345 if (error) { 346 mutex_spin_exit(&tty_lock); 347 return (error); 348 } 349 } 350 } 351 mutex_spin_exit(&tty_lock); 352 error = (*tp->t_linesw->l_open)(dev, tp); 353 ptcwakeup(tp, FREAD|FWRITE); 354 return (error); 355 } 356 357 int 358 ptsclose(dev_t dev, int flag, int mode, struct lwp *l) 359 { 360 struct pt_softc *pti = pt_softc[minor(dev)]; 361 struct tty *tp = pti->pt_tty; 362 int error; 363 364 error = (*tp->t_linesw->l_close)(tp, flag); 365 error |= ttyclose(tp); 366 ptcwakeup(tp, FREAD|FWRITE); 367 return (error); 368 } 369 370 int 371 ptsread(dev, uio, flag) 372 dev_t dev; 373 struct uio *uio; 374 int flag; 375 { 376 struct proc *p = curproc; 377 struct pt_softc *pti = pt_softc[minor(dev)]; 378 struct tty *tp = pti->pt_tty; 379 int error = 0; 380 int cc, c; 381 382 again: 383 if (pti->pt_flags & PF_REMOTE) { 384 mutex_spin_enter(&tty_lock); 385 while (isbackground(p, tp)) { /* XXXSMP */ 386 if (sigismasked(curlwp, SIGTTIN) || 387 p->p_pgrp->pg_jobc == 0 || 388 p->p_flag & PS_PPWAIT) { 389 mutex_spin_exit(&tty_lock); 390 return (EIO); 391 } 392 ttysig(tp, TTYSIG_PG1, SIGTTIN); 393 error = ttysleep(tp, &lbolt, true, 0); 394 if (error) { 395 mutex_spin_exit(&tty_lock); 396 return (error); 397 } 398 } 399 if (tp->t_canq.c_cc == 0) { 400 if (flag & IO_NDELAY) { 401 mutex_spin_exit(&tty_lock); 402 return (EWOULDBLOCK); 403 } 404 error = ttysleep(tp, &tp->t_canq.c_cv, true, 0); 405 mutex_spin_exit(&tty_lock); 406 if (error) 407 return (error); 408 goto again; 409 } 410 while(error == 0 && tp->t_canq.c_cc > 1 && uio->uio_resid > 0) { 411 c = getc(&tp->t_canq); 412 mutex_spin_exit(&tty_lock); 413 error = ureadc(c, uio); 414 mutex_spin_enter(&tty_lock); 415 /* Re-check terminal state here? */ 416 } 417 if (tp->t_canq.c_cc == 1) 418 (void) getc(&tp->t_canq); 419 cc = tp->t_canq.c_cc; 420 mutex_spin_exit(&tty_lock); 421 if (cc) 422 return (error); 423 } else if (tp->t_oproc) 424 error = (*tp->t_linesw->l_read)(tp, uio, flag); 425 ptcwakeup(tp, FWRITE); 426 return (error); 427 } 428 429 /* 430 * Write to pseudo-tty. 431 * Wakeups of controlling tty will happen 432 * indirectly, when tty driver calls ptsstart. 433 */ 434 int 435 ptswrite(dev, uio, flag) 436 dev_t dev; 437 struct uio *uio; 438 int flag; 439 { 440 struct pt_softc *pti = pt_softc[minor(dev)]; 441 struct tty *tp = pti->pt_tty; 442 443 if (tp->t_oproc == 0) 444 return (EIO); 445 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 446 } 447 448 /* 449 * Poll pseudo-tty. 450 */ 451 int 452 ptspoll(dev, events, l) 453 dev_t dev; 454 int events; 455 struct lwp *l; 456 { 457 struct pt_softc *pti = pt_softc[minor(dev)]; 458 struct tty *tp = pti->pt_tty; 459 460 if (tp->t_oproc == 0) 461 return (POLLHUP); 462 463 return ((*tp->t_linesw->l_poll)(tp, events, l)); 464 } 465 466 /* 467 * Start output on pseudo-tty. 468 * Wake up process polling or sleeping for input from controlling tty. 469 */ 470 void 471 ptsstart(tp) 472 struct tty *tp; 473 { 474 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 475 476 KASSERT(mutex_owned(&tty_lock)); 477 478 if (ISSET(tp->t_state, TS_TTSTOP)) 479 return; 480 if (pti->pt_flags & PF_STOPPED) { 481 pti->pt_flags &= ~PF_STOPPED; 482 pti->pt_send = TIOCPKT_START; 483 } 484 485 selnotify(&pti->pt_selr, NOTE_SUBMIT); 486 clwakeup(&tp->t_outq); 487 } 488 489 /* 490 * Stop output. 491 */ 492 void 493 ptsstop(tp, flush) 494 struct tty *tp; 495 int flush; 496 { 497 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 498 499 KASSERT(mutex_owned(&tty_lock)); 500 501 /* note: FLUSHREAD and FLUSHWRITE already ok */ 502 if (flush == 0) { 503 flush = TIOCPKT_STOP; 504 pti->pt_flags |= PF_STOPPED; 505 } else 506 pti->pt_flags &= ~PF_STOPPED; 507 pti->pt_send |= flush; 508 509 /* change of perspective */ 510 if (flush & FREAD) { 511 selnotify(&pti->pt_selw, NOTE_SUBMIT); 512 clwakeup(&tp->t_rawq); 513 } 514 if (flush & FWRITE) { 515 selnotify(&pti->pt_selr, NOTE_SUBMIT); 516 clwakeup(&tp->t_outq); 517 } 518 } 519 520 void 521 ptcwakeup(tp, flag) 522 struct tty *tp; 523 int flag; 524 { 525 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 526 527 mutex_spin_enter(&tty_lock); 528 if (flag & FREAD) { 529 selnotify(&pti->pt_selr, NOTE_SUBMIT); 530 clwakeup(&tp->t_outq); 531 } 532 if (flag & FWRITE) { 533 selnotify(&pti->pt_selw, NOTE_SUBMIT); 534 clwakeup(&tp->t_rawq); 535 } 536 mutex_spin_exit(&tty_lock); 537 } 538 539 /*ARGSUSED*/ 540 int 541 ptcopen(dev_t dev, int flag, int devtype, struct lwp *l) 542 { 543 struct pt_softc *pti; 544 struct tty *tp; 545 int error; 546 int ptn = minor(dev); 547 548 if ((error = pty_check(ptn)) != 0) 549 return (error); 550 551 pti = pt_softc[ptn]; 552 tp = pti->pt_tty; 553 554 mutex_spin_enter(&tty_lock); 555 if (tp->t_oproc) { 556 mutex_spin_exit(&tty_lock); 557 return (EIO); 558 } 559 tp->t_oproc = ptsstart; 560 mutex_spin_exit(&tty_lock); 561 (void)(*tp->t_linesw->l_modem)(tp, 1); 562 CLR(tp->t_lflag, EXTPROC); 563 pti->pt_flags = 0; 564 pti->pt_send = 0; 565 pti->pt_ucntl = 0; 566 return (0); 567 } 568 569 /*ARGSUSED*/ 570 int 571 ptcclose(dev_t dev, int flag, int devtype, struct lwp *l) 572 { 573 struct pt_softc *pti = pt_softc[minor(dev)]; 574 struct tty *tp = pti->pt_tty; 575 576 (void)(*tp->t_linesw->l_modem)(tp, 0); 577 mutex_spin_enter(&tty_lock); 578 CLR(tp->t_state, TS_CARR_ON); 579 tp->t_oproc = 0; /* mark closed */ 580 mutex_spin_exit(&tty_lock); 581 return (0); 582 } 583 584 int 585 ptcread(dev, uio, flag) 586 dev_t dev; 587 struct uio *uio; 588 int flag; 589 { 590 struct pt_softc *pti = pt_softc[minor(dev)]; 591 struct tty *tp = pti->pt_tty; 592 u_char bf[BUFSIZ]; 593 int error = 0, cc; 594 595 /* 596 * We want to block until the slave 597 * is open, and there's something to read; 598 * but if we lost the slave or we're NBIO, 599 * then return the appropriate error instead. 600 */ 601 mutex_spin_enter(&tty_lock); 602 for (;;) { 603 if (ISSET(tp->t_state, TS_ISOPEN)) { 604 if (pti->pt_flags & PF_PKT && pti->pt_send) { 605 mutex_spin_exit(&tty_lock); 606 error = ureadc((int)pti->pt_send, uio); 607 if (error) 608 return (error); 609 /* 610 * Since we don't have the tty locked, there's 611 * a risk of messing up `t_termios'. This is 612 * relevant only if the tty got closed and then 613 * opened again while we were out uiomoving. 614 */ 615 if (pti->pt_send & TIOCPKT_IOCTL) { 616 cc = min(uio->uio_resid, 617 sizeof(tp->t_termios)); 618 uiomove((void *) &tp->t_termios, 619 cc, uio); 620 } 621 pti->pt_send = 0; 622 return (0); 623 } 624 if (pti->pt_flags & PF_UCNTL && pti->pt_ucntl) { 625 mutex_spin_exit(&tty_lock); 626 error = ureadc((int)pti->pt_ucntl, uio); 627 if (error) 628 return (error); 629 pti->pt_ucntl = 0; 630 return (0); 631 } 632 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 633 break; 634 } 635 if (!ISSET(tp->t_state, TS_CARR_ON)) { 636 error = 0; /* EOF */ 637 goto out; 638 } 639 if (flag & IO_NDELAY) { 640 error = EWOULDBLOCK; 641 goto out; 642 } 643 error = cv_wait_sig(&tp->t_outq.c_cv, &tty_lock); 644 if (error) 645 goto out; 646 } 647 648 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) { 649 mutex_spin_exit(&tty_lock); 650 error = ureadc(0, uio); 651 mutex_spin_enter(&tty_lock); 652 if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) 653 error = EIO; 654 } 655 while (uio->uio_resid > 0 && error == 0) { 656 cc = q_to_b(&tp->t_outq, bf, min(uio->uio_resid, BUFSIZ)); 657 if (cc <= 0) 658 break; 659 mutex_spin_exit(&tty_lock); 660 error = uiomove(bf, cc, uio); 661 mutex_spin_enter(&tty_lock); 662 if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) 663 error = EIO; 664 } 665 ttypull(tp); 666 out: 667 mutex_spin_exit(&tty_lock); 668 return (error); 669 } 670 671 672 int 673 ptcwrite(dev, uio, flag) 674 dev_t dev; 675 struct uio *uio; 676 int flag; 677 { 678 struct pt_softc *pti = pt_softc[minor(dev)]; 679 struct tty *tp = pti->pt_tty; 680 u_char *cp = NULL; 681 int cc = 0; 682 u_char locbuf[BUFSIZ]; 683 int cnt = 0; 684 int error = 0; 685 686 again: 687 mutex_spin_enter(&tty_lock); 688 if (!ISSET(tp->t_state, TS_ISOPEN)) 689 goto block; 690 if (pti->pt_flags & PF_REMOTE) { 691 if (tp->t_canq.c_cc) 692 goto block; 693 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 694 if (cc == 0) { 695 cc = min(uio->uio_resid, BUFSIZ); 696 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 697 cp = locbuf; 698 mutex_spin_exit(&tty_lock); 699 error = uiomove((void *)cp, cc, uio); 700 if (error) 701 return (error); 702 mutex_spin_enter(&tty_lock); 703 /* check again for safety */ 704 if (!ISSET(tp->t_state, TS_ISOPEN)) { 705 /* 706 * adjust for data copied in but not 707 * written 708 */ 709 uio->uio_resid += cc; 710 error = EIO; 711 goto out; 712 } 713 } 714 if (cc) 715 (void) b_to_q(cp, cc, &tp->t_canq); 716 cc = 0; 717 } 718 (void) putc(0, &tp->t_canq); 719 ttwakeup(tp); 720 clwakeup(&tp->t_canq); 721 error = 0; 722 goto out; 723 } 724 while (uio->uio_resid > 0) { 725 if (cc == 0) { 726 cc = min(uio->uio_resid, BUFSIZ); 727 cp = locbuf; 728 mutex_spin_exit(&tty_lock); 729 error = uiomove((void *)cp, cc, uio); 730 if (error) 731 return (error); 732 mutex_spin_enter(&tty_lock); 733 /* check again for safety */ 734 if (!ISSET(tp->t_state, TS_ISOPEN)) { 735 /* adjust for data copied in but not written */ 736 uio->uio_resid += cc; 737 error = EIO; 738 goto out; 739 } 740 } 741 while (cc > 0) { 742 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 743 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_lflag, ICANON))) { 744 clwakeup(&tp->t_rawq); 745 goto block; 746 } 747 /* XXX - should change l_rint to be called with lock 748 * see also tty.c:ttyinput_wlock() 749 */ 750 mutex_spin_exit(&tty_lock); 751 (*tp->t_linesw->l_rint)(*cp++, tp); 752 mutex_spin_enter(&tty_lock); 753 cnt++; 754 cc--; 755 } 756 cc = 0; 757 } 758 error = 0; 759 goto out; 760 761 block: 762 /* 763 * Come here to wait for slave to open, for space 764 * in outq, or space in rawq. 765 */ 766 if (!ISSET(tp->t_state, TS_CARR_ON)) { 767 /* adjust for data copied in but not written */ 768 uio->uio_resid += cc; 769 error = EIO; 770 goto out; 771 } 772 if (flag & IO_NDELAY) { 773 /* adjust for data copied in but not written */ 774 uio->uio_resid += cc; 775 error = cnt == 0 ? EWOULDBLOCK : 0; 776 goto out; 777 } 778 error = cv_wait_sig(&tp->t_rawq.c_cv, &tty_lock); 779 mutex_spin_exit(&tty_lock); 780 if (error) { 781 /* adjust for data copied in but not written */ 782 uio->uio_resid += cc; 783 return (error); 784 } 785 goto again; 786 787 out: 788 mutex_spin_exit(&tty_lock); 789 return (error); 790 } 791 792 int 793 ptcpoll(dev, events, l) 794 dev_t dev; 795 int events; 796 struct lwp *l; 797 { 798 struct pt_softc *pti = pt_softc[minor(dev)]; 799 struct tty *tp = pti->pt_tty; 800 int revents = 0; 801 802 mutex_spin_enter(&tty_lock); 803 804 if (events & (POLLIN | POLLRDNORM)) 805 if (ISSET(tp->t_state, TS_ISOPEN) && 806 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 807 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 808 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 809 revents |= events & (POLLIN | POLLRDNORM); 810 811 if (events & (POLLOUT | POLLWRNORM)) 812 if (ISSET(tp->t_state, TS_ISOPEN) && 813 ((pti->pt_flags & PF_REMOTE) ? 814 (tp->t_canq.c_cc == 0) : 815 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 816 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))) 817 revents |= events & (POLLOUT | POLLWRNORM); 818 819 if (events & POLLHUP) 820 if (!ISSET(tp->t_state, TS_CARR_ON)) 821 revents |= POLLHUP; 822 823 if (revents == 0) { 824 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 825 selrecord(l, &pti->pt_selr); 826 827 if (events & (POLLOUT | POLLWRNORM)) 828 selrecord(l, &pti->pt_selw); 829 } 830 831 mutex_spin_exit(&tty_lock); 832 833 return (revents); 834 } 835 836 static void 837 filt_ptcrdetach(struct knote *kn) 838 { 839 struct pt_softc *pti; 840 struct tty *tp; 841 842 pti = kn->kn_hook; 843 tp = pti->pt_tty; 844 845 mutex_spin_enter(&tty_lock); 846 SLIST_REMOVE(&pti->pt_selr.sel_klist, kn, knote, kn_selnext); 847 mutex_spin_exit(&tty_lock); 848 } 849 850 static int 851 filt_ptcread(struct knote *kn, long hint) 852 { 853 struct pt_softc *pti; 854 struct tty *tp; 855 int canread; 856 857 pti = kn->kn_hook; 858 tp = pti->pt_tty; 859 860 mutex_spin_enter(&tty_lock); 861 862 canread = (ISSET(tp->t_state, TS_ISOPEN) && 863 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 864 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 865 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))); 866 867 if (canread) { 868 /* 869 * c_cc is number of characters after output post-processing; 870 * the amount of data actually read(2) depends on 871 * setting of input flags for the terminal. 872 */ 873 kn->kn_data = tp->t_outq.c_cc; 874 if (((pti->pt_flags & PF_PKT) && pti->pt_send) || 875 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)) 876 kn->kn_data++; 877 } 878 879 mutex_spin_exit(&tty_lock); 880 881 return (canread); 882 } 883 884 static void 885 filt_ptcwdetach(struct knote *kn) 886 { 887 struct pt_softc *pti; 888 struct tty *tp; 889 890 pti = kn->kn_hook; 891 tp = pti->pt_tty; 892 893 mutex_spin_enter(&tty_lock); 894 SLIST_REMOVE(&pti->pt_selw.sel_klist, kn, knote, kn_selnext); 895 mutex_spin_exit(&tty_lock); 896 } 897 898 static int 899 filt_ptcwrite(struct knote *kn, long hint) 900 { 901 struct pt_softc *pti; 902 struct tty *tp; 903 int canwrite; 904 int nwrite; 905 906 pti = kn->kn_hook; 907 tp = pti->pt_tty; 908 909 mutex_spin_enter(&tty_lock); 910 911 canwrite = (ISSET(tp->t_state, TS_ISOPEN) && 912 ((pti->pt_flags & PF_REMOTE) ? 913 (tp->t_canq.c_cc == 0) : 914 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 915 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))); 916 917 if (canwrite) { 918 if (pti->pt_flags & PF_REMOTE) 919 nwrite = tp->t_canq.c_cn; 920 else { 921 /* this is guaranteed to be > 0 due to above check */ 922 nwrite = tp->t_canq.c_cn 923 - (tp->t_rawq.c_cc + tp->t_canq.c_cc); 924 } 925 kn->kn_data = nwrite; 926 } 927 928 mutex_spin_exit(&tty_lock); 929 930 return (canwrite); 931 } 932 933 static const struct filterops ptcread_filtops = 934 { 1, NULL, filt_ptcrdetach, filt_ptcread }; 935 static const struct filterops ptcwrite_filtops = 936 { 1, NULL, filt_ptcwdetach, filt_ptcwrite }; 937 938 int 939 ptckqfilter(dev_t dev, struct knote *kn) 940 { 941 struct pt_softc *pti = pt_softc[minor(dev)]; 942 struct klist *klist; 943 944 switch (kn->kn_filter) { 945 case EVFILT_READ: 946 klist = &pti->pt_selr.sel_klist; 947 kn->kn_fop = &ptcread_filtops; 948 break; 949 case EVFILT_WRITE: 950 klist = &pti->pt_selw.sel_klist; 951 kn->kn_fop = &ptcwrite_filtops; 952 break; 953 default: 954 return (EINVAL); 955 } 956 957 kn->kn_hook = pti; 958 959 mutex_spin_enter(&tty_lock); 960 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 961 mutex_spin_exit(&tty_lock); 962 963 return (0); 964 } 965 966 struct tty * 967 ptytty(dev) 968 dev_t dev; 969 { 970 struct pt_softc *pti = pt_softc[minor(dev)]; 971 struct tty *tp = pti->pt_tty; 972 973 return (tp); 974 } 975 976 /*ARGSUSED*/ 977 int 978 ptyioctl(dev, cmd, data, flag, l) 979 dev_t dev; 980 u_long cmd; 981 void *data; 982 int flag; 983 struct lwp *l; 984 { 985 struct pt_softc *pti = pt_softc[minor(dev)]; 986 struct tty *tp = pti->pt_tty; 987 const struct cdevsw *cdev; 988 u_char *cc = tp->t_cc; 989 int stop, error, sig; 990 991 /* 992 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 993 * ttywflush(tp) will hang if there are characters in the outq. 994 */ 995 if (cmd == TIOCEXT) { 996 /* 997 * When the EXTPROC bit is being toggled, we need 998 * to send an TIOCPKT_IOCTL if the packet driver 999 * is turned on. 1000 */ 1001 if (*(int *)data) { 1002 if (pti->pt_flags & PF_PKT) { 1003 pti->pt_send |= TIOCPKT_IOCTL; 1004 ptcwakeup(tp, FREAD); 1005 } 1006 SET(tp->t_lflag, EXTPROC); 1007 } else { 1008 if (ISSET(tp->t_lflag, EXTPROC) && 1009 (pti->pt_flags & PF_PKT)) { 1010 pti->pt_send |= TIOCPKT_IOCTL; 1011 ptcwakeup(tp, FREAD); 1012 } 1013 CLR(tp->t_lflag, EXTPROC); 1014 } 1015 return(0); 1016 } 1017 1018 #ifndef NO_DEV_PTM 1019 /* Allow getting the name from either the master or the slave */ 1020 if (cmd == TIOCPTSNAME) 1021 return pty_fill_ptmget(l, dev, -1, -1, data); 1022 #endif 1023 1024 cdev = cdevsw_lookup(dev); 1025 if (cdev != NULL && cdev->d_open == ptcopen) 1026 switch (cmd) { 1027 #ifndef NO_DEV_PTM 1028 case TIOCGRANTPT: 1029 return pty_grant_slave(l, dev); 1030 #endif 1031 1032 case TIOCGPGRP: 1033 /* 1034 * We avoid calling ttioctl on the controller since, 1035 * in that case, tp must be the controlling terminal. 1036 */ 1037 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1038 return (0); 1039 1040 case TIOCPKT: 1041 if (*(int *)data) { 1042 if (pti->pt_flags & PF_UCNTL) 1043 return (EINVAL); 1044 pti->pt_flags |= PF_PKT; 1045 } else 1046 pti->pt_flags &= ~PF_PKT; 1047 return (0); 1048 1049 case TIOCUCNTL: 1050 if (*(int *)data) { 1051 if (pti->pt_flags & PF_PKT) 1052 return (EINVAL); 1053 pti->pt_flags |= PF_UCNTL; 1054 } else 1055 pti->pt_flags &= ~PF_UCNTL; 1056 return (0); 1057 1058 case TIOCREMOTE: 1059 if (*(int *)data) 1060 pti->pt_flags |= PF_REMOTE; 1061 else 1062 pti->pt_flags &= ~PF_REMOTE; 1063 mutex_spin_enter(&tty_lock); 1064 ttyflush(tp, FREAD|FWRITE); 1065 mutex_spin_exit(&tty_lock); 1066 return (0); 1067 1068 #ifdef COMPAT_OLDTTY 1069 case TIOCSETP: 1070 case TIOCSETN: 1071 #endif 1072 case TIOCSETD: 1073 case TIOCSETA: 1074 case TIOCSETAW: 1075 case TIOCSETAF: 1076 mutex_spin_enter(&tty_lock); 1077 ndflush(&tp->t_outq, tp->t_outq.c_cc); 1078 mutex_spin_exit(&tty_lock); 1079 break; 1080 1081 case TIOCSIG: 1082 sig = (int)(long)*(void **)data; 1083 if (sig <= 0 || sig >= NSIG) 1084 return (EINVAL); 1085 mutex_spin_enter(&tty_lock); 1086 if (!ISSET(tp->t_lflag, NOFLSH)) 1087 ttyflush(tp, FREAD|FWRITE); 1088 if ((sig == SIGINFO) && 1089 (!ISSET(tp->t_lflag, NOKERNINFO))) 1090 ttyinfo(tp, 1); 1091 ttysig(tp, TTYSIG_PG1, sig); 1092 mutex_spin_exit(&tty_lock); 1093 return(0); 1094 } 1095 1096 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 1097 if (error == EPASSTHROUGH) 1098 error = ttioctl(tp, cmd, data, flag, l); 1099 if (error == EPASSTHROUGH) { 1100 if (pti->pt_flags & PF_UCNTL && 1101 (cmd & ~0xff) == UIOCCMD(0)) { 1102 if (cmd & 0xff) { 1103 pti->pt_ucntl = (u_char)cmd; 1104 ptcwakeup(tp, FREAD); 1105 } 1106 return (0); 1107 } 1108 } 1109 /* 1110 * If external processing and packet mode send ioctl packet. 1111 */ 1112 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 1113 switch(cmd) { 1114 case TIOCSETA: 1115 case TIOCSETAW: 1116 case TIOCSETAF: 1117 #ifdef COMPAT_OLDTTY 1118 case TIOCSETP: 1119 case TIOCSETN: 1120 case TIOCSETC: 1121 case TIOCSLTC: 1122 case TIOCLBIS: 1123 case TIOCLBIC: 1124 case TIOCLSET: 1125 #endif 1126 pti->pt_send |= TIOCPKT_IOCTL; 1127 ptcwakeup(tp, FREAD); 1128 default: 1129 break; 1130 } 1131 } 1132 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 1133 && CCEQ(cc[VSTART], CTRL('q')); 1134 if (pti->pt_flags & PF_NOSTOP) { 1135 if (stop) { 1136 pti->pt_send &= ~TIOCPKT_NOSTOP; 1137 pti->pt_send |= TIOCPKT_DOSTOP; 1138 pti->pt_flags &= ~PF_NOSTOP; 1139 ptcwakeup(tp, FREAD); 1140 } 1141 } else { 1142 if (!stop) { 1143 pti->pt_send &= ~TIOCPKT_DOSTOP; 1144 pti->pt_send |= TIOCPKT_NOSTOP; 1145 pti->pt_flags |= PF_NOSTOP; 1146 ptcwakeup(tp, FREAD); 1147 } 1148 } 1149 return (error); 1150 } 1151