1 /* $NetBSD: tty_pty.c,v 1.119 2009/10/14 19:25:39 dsl 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 1.119 2009/10/14 19:25:39 dsl Exp $"); 41 42 #include "opt_ptm.h" 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/ioctl.h> 47 #include <sys/ioctl_compat.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/pty.h> 61 #include <sys/kauth.h> 62 63 #define DEFAULT_NPTYS 16 /* default number of initial ptys */ 64 #define DEFAULT_MAXPTYS 992 /* default maximum number of ptys */ 65 66 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 67 68 struct pt_softc { 69 struct tty *pt_tty; 70 int pt_flags; 71 struct selinfo pt_selr, pt_selw; 72 u_char pt_send; 73 u_char pt_ucntl; 74 }; 75 76 static struct pt_softc **pt_softc = NULL; /* pty array */ 77 static int maxptys = DEFAULT_MAXPTYS; /* maximum number of ptys (sysctable) */ 78 kmutex_t pt_softc_mutex; 79 int npty = 0; /* for pstat -t */ 80 81 #define PF_PKT 0x08 /* packet mode */ 82 #define PF_STOPPED 0x10 /* user told stopped */ 83 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 84 #define PF_NOSTOP 0x40 85 #define PF_UCNTL 0x80 /* user control mode */ 86 87 void ptyattach(int); 88 void ptcwakeup(struct tty *, int); 89 void ptsstart(struct tty *); 90 int pty_maxptys(int, int); 91 92 static struct pt_softc **ptyarralloc(int); 93 94 dev_type_open(ptcopen); 95 dev_type_close(ptcclose); 96 dev_type_read(ptcread); 97 dev_type_write(ptcwrite); 98 dev_type_poll(ptcpoll); 99 dev_type_kqfilter(ptckqfilter); 100 101 dev_type_open(ptsopen); 102 dev_type_close(ptsclose); 103 dev_type_read(ptsread); 104 dev_type_write(ptswrite); 105 dev_type_stop(ptsstop); 106 dev_type_poll(ptspoll); 107 108 dev_type_ioctl(ptyioctl); 109 dev_type_tty(ptytty); 110 111 const struct cdevsw ptc_cdevsw = { 112 ptcopen, ptcclose, ptcread, ptcwrite, ptyioctl, 113 nullstop, ptytty, ptcpoll, nommap, ptckqfilter, D_TTY 114 }; 115 116 const struct cdevsw pts_cdevsw = { 117 ptsopen, ptsclose, ptsread, ptswrite, ptyioctl, 118 ptsstop, ptytty, ptspoll, nommap, ttykqfilter, D_TTY 119 }; 120 121 #if defined(pmax) 122 const struct cdevsw ptc_ultrix_cdevsw = { 123 ptcopen, ptcclose, ptcread, ptcwrite, ptyioctl, 124 nullstop, ptytty, ptcpoll, nommap, ptckqfilter, D_TTY 125 }; 126 127 const struct cdevsw pts_ultrix_cdevsw = { 128 ptsopen, ptsclose, ptsread, ptswrite, ptyioctl, 129 ptsstop, ptytty, ptspoll, nommap, ttykqfilter, D_TTY 130 }; 131 #endif /* defined(pmax) */ 132 133 /* 134 * Check if a pty is free to use. 135 */ 136 int 137 pty_isfree(int minor, int lock) 138 { 139 struct pt_softc *pt = pt_softc[minor]; 140 if (lock) 141 mutex_enter(&pt_softc_mutex); 142 minor = pt == NULL || pt->pt_tty == NULL || 143 pt->pt_tty->t_oproc == NULL; 144 if (lock) 145 mutex_exit(&pt_softc_mutex); 146 return minor; 147 } 148 149 /* 150 * Allocate and zero array of nelem elements. 151 */ 152 static struct pt_softc ** 153 ptyarralloc(int nelem) 154 { 155 struct pt_softc **pt; 156 nelem += 10; 157 pt = kmem_zalloc(nelem * sizeof(*pt), KM_SLEEP); 158 return pt; 159 } 160 161 static void 162 ptyarrfree(struct pt_softc **pt, int nelem) 163 { 164 165 nelem += 10; 166 kmem_free(pt, nelem * sizeof(*pt)); 167 } 168 169 /* 170 * Check if the minor is correct and ensure necessary structures 171 * are properly allocated. 172 */ 173 int 174 pty_check(int ptn) 175 { 176 struct pt_softc *pti; 177 178 if (ptn >= npty) { 179 struct pt_softc **newpt, **oldpt; 180 int newnpty; 181 int oldnpty; 182 183 /* check if the requested pty can be granted */ 184 if (ptn >= maxptys) { 185 limit_reached: 186 tablefull("pty", "increase kern.maxptys"); 187 return (ENXIO); 188 } 189 190 /* Allocate a larger pty array */ 191 for (newnpty = npty; newnpty <= ptn;) 192 newnpty *= 2; 193 if (newnpty > maxptys) 194 newnpty = maxptys; 195 newpt = ptyarralloc(newnpty); 196 197 /* 198 * Now grab the pty array mutex - we need to ensure 199 * that the pty array is consistent while copying it's 200 * content to newly allocated, larger space; we also 201 * need to be safe against pty_maxptys(). 202 */ 203 mutex_enter(&pt_softc_mutex); 204 205 if (newnpty >= maxptys) { 206 /* limit cut away beneath us... */ 207 if (ptn >= maxptys) { 208 mutex_exit(&pt_softc_mutex); 209 ptyarrfree(newpt, newnpty); 210 goto limit_reached; 211 } 212 newnpty = maxptys; 213 } 214 215 /* 216 * If the pty array was not enlarged while we were waiting 217 * for mutex, copy current contents of pt_softc[] to newly 218 * allocated array and start using the new bigger array. 219 */ 220 if (newnpty > npty) { 221 memcpy(newpt, pt_softc, npty*sizeof(struct pt_softc *)); 222 oldpt = pt_softc; 223 oldnpty = npty; 224 pt_softc = newpt; 225 npty = newnpty; 226 } else { 227 /* was enlarged when waited for lock, free new space */ 228 oldpt = newpt; 229 oldnpty = newnpty; 230 } 231 232 mutex_exit(&pt_softc_mutex); 233 ptyarrfree(oldpt, oldnpty); 234 } 235 236 /* 237 * If the entry is not yet allocated, allocate one. The mutex is 238 * needed so that the state of pt_softc[] array is consistant 239 * in case it has been lengthened above. 240 */ 241 if (!pt_softc[ptn]) { 242 pti = kmem_zalloc(sizeof(*pti), KM_SLEEP); 243 244 selinit(&pti->pt_selr); 245 selinit(&pti->pt_selw); 246 pti->pt_tty = ttymalloc(); 247 248 mutex_enter(&pt_softc_mutex); 249 250 /* 251 * Check the entry again - it might have been 252 * added while we were waiting for mutex. 253 */ 254 if (pt_softc[ptn]) { 255 mutex_exit(&pt_softc_mutex); 256 ttyfree(pti->pt_tty); 257 seldestroy(&pti->pt_selr); 258 seldestroy(&pti->pt_selw); 259 kmem_free(pti, sizeof(*pti)); 260 return (0); 261 } 262 tty_attach(pti->pt_tty); 263 pt_softc[ptn] = pti; 264 265 mutex_exit(&pt_softc_mutex); 266 } 267 268 return (0); 269 } 270 271 /* 272 * Set maxpty in thread-safe way. Returns 0 in case of error, otherwise 273 * new value of maxptys. 274 */ 275 int 276 pty_maxptys(int newmax, int set) 277 { 278 if (!set) 279 return (maxptys); 280 281 /* 282 * We have to grab the pt_softc lock, so that we would pick correct 283 * value of npty (might be modified in pty_check()). 284 */ 285 mutex_enter(&pt_softc_mutex); 286 287 /* 288 * The value cannot be set to value lower than the highest pty 289 * number ever allocated. 290 */ 291 if (newmax >= npty) 292 maxptys = newmax; 293 else 294 newmax = 0; 295 296 mutex_exit(&pt_softc_mutex); 297 298 return newmax; 299 } 300 301 /* 302 * Establish n (or default if n is 1) ptys in the system. 303 */ 304 void 305 ptyattach(int n) 306 { 307 308 mutex_init(&pt_softc_mutex, MUTEX_DEFAULT, IPL_NONE); 309 310 /* maybe should allow 0 => none? */ 311 if (n <= 1) 312 n = DEFAULT_NPTYS; 313 pt_softc = ptyarralloc(n); 314 npty = n; 315 #ifndef NO_DEV_PTM 316 ptmattach(1); 317 #endif 318 } 319 320 /*ARGSUSED*/ 321 int 322 ptsopen(dev_t dev, int flag, int devtype, struct lwp *l) 323 { 324 struct pt_softc *pti; 325 struct tty *tp; 326 int error; 327 int ptn = minor(dev); 328 329 if ((error = pty_check(ptn)) != 0) 330 return (error); 331 332 mutex_spin_enter(&tty_lock); 333 pti = pt_softc[ptn]; 334 tp = pti->pt_tty; 335 if (!ISSET(tp->t_state, TS_ISOPEN)) { 336 ttychars(tp); /* Set up default chars */ 337 tp->t_iflag = TTYDEF_IFLAG; 338 tp->t_oflag = TTYDEF_OFLAG; 339 tp->t_lflag = TTYDEF_LFLAG; 340 tp->t_cflag = TTYDEF_CFLAG; 341 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 342 ttsetwater(tp); /* would be done in xxparam() */ 343 } else if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, 344 tp) != 0) { 345 mutex_spin_exit(&tty_lock); 346 return (EBUSY); 347 } 348 if (tp->t_oproc) /* Ctrlr still around. */ 349 SET(tp->t_state, TS_CARR_ON); 350 if (!ISSET(flag, O_NONBLOCK)) { 351 while (!ISSET(tp->t_state, TS_CARR_ON)) { 352 tp->t_wopen++; 353 error = ttysleep(tp, &tp->t_rawcv, true, 0); 354 tp->t_wopen--; 355 if (error) { 356 mutex_spin_exit(&tty_lock); 357 return (error); 358 } 359 } 360 } 361 mutex_spin_exit(&tty_lock); 362 error = (*tp->t_linesw->l_open)(dev, tp); 363 ptcwakeup(tp, FREAD|FWRITE); 364 return (error); 365 } 366 367 int 368 ptsclose(dev_t dev, int flag, int mode, struct lwp *l) 369 { 370 struct pt_softc *pti = pt_softc[minor(dev)]; 371 struct tty *tp = pti->pt_tty; 372 int error; 373 374 error = (*tp->t_linesw->l_close)(tp, flag); 375 error |= ttyclose(tp); 376 ptcwakeup(tp, FREAD|FWRITE); 377 return (error); 378 } 379 380 int 381 ptsread(dev_t dev, struct uio *uio, int flag) 382 { 383 struct proc *p = curproc; 384 struct pt_softc *pti = pt_softc[minor(dev)]; 385 struct tty *tp = pti->pt_tty; 386 int error = 0; 387 int cc, c; 388 389 again: 390 if (pti->pt_flags & PF_REMOTE) { 391 mutex_spin_enter(&tty_lock); 392 while (isbackground(p, tp)) { /* XXXSMP */ 393 if (sigismasked(curlwp, SIGTTIN) || 394 p->p_pgrp->pg_jobc == 0 || 395 p->p_lflag & PL_PPWAIT) { 396 mutex_spin_exit(&tty_lock); 397 return (EIO); 398 } 399 ttysig(tp, TTYSIG_PG1, SIGTTIN); 400 error = ttysleep(tp, &lbolt, true, 0); 401 if (error) { 402 mutex_spin_exit(&tty_lock); 403 return (error); 404 } 405 } 406 if (tp->t_canq.c_cc == 0) { 407 if (flag & IO_NDELAY) { 408 mutex_spin_exit(&tty_lock); 409 return (EWOULDBLOCK); 410 } 411 error = ttysleep(tp, &tp->t_cancv, true, 0); 412 mutex_spin_exit(&tty_lock); 413 if (error) 414 return (error); 415 goto again; 416 } 417 while(error == 0 && tp->t_canq.c_cc > 1 && uio->uio_resid > 0) { 418 c = getc(&tp->t_canq); 419 mutex_spin_exit(&tty_lock); 420 error = ureadc(c, uio); 421 mutex_spin_enter(&tty_lock); 422 /* Re-check terminal state here? */ 423 } 424 if (tp->t_canq.c_cc == 1) 425 (void) getc(&tp->t_canq); 426 cc = tp->t_canq.c_cc; 427 mutex_spin_exit(&tty_lock); 428 if (cc) 429 return (error); 430 } else if (tp->t_oproc) 431 error = (*tp->t_linesw->l_read)(tp, uio, flag); 432 ptcwakeup(tp, FWRITE); 433 return (error); 434 } 435 436 /* 437 * Write to pseudo-tty. 438 * Wakeups of controlling tty will happen 439 * indirectly, when tty driver calls ptsstart. 440 */ 441 int 442 ptswrite(dev_t dev, struct uio *uio, int flag) 443 { 444 struct pt_softc *pti = pt_softc[minor(dev)]; 445 struct tty *tp = pti->pt_tty; 446 447 if (tp->t_oproc == 0) 448 return (EIO); 449 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 450 } 451 452 /* 453 * Poll pseudo-tty. 454 */ 455 int 456 ptspoll(dev_t dev, int events, struct lwp *l) 457 { 458 struct pt_softc *pti = pt_softc[minor(dev)]; 459 struct tty *tp = pti->pt_tty; 460 461 if (tp->t_oproc == 0) 462 return (POLLHUP); 463 464 return ((*tp->t_linesw->l_poll)(tp, events, l)); 465 } 466 467 /* 468 * Start output on pseudo-tty. 469 * Wake up process polling or sleeping for input from controlling tty. 470 */ 471 void 472 ptsstart(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, 0, NOTE_SUBMIT); 486 cv_broadcast(&tp->t_outcvf); 487 } 488 489 /* 490 * Stop output. 491 */ 492 void 493 ptsstop(struct tty *tp, int flush) 494 { 495 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 496 497 KASSERT(mutex_owned(&tty_lock)); 498 499 /* note: FLUSHREAD and FLUSHWRITE already ok */ 500 if (flush == 0) { 501 flush = TIOCPKT_STOP; 502 pti->pt_flags |= PF_STOPPED; 503 } else 504 pti->pt_flags &= ~PF_STOPPED; 505 pti->pt_send |= flush; 506 507 /* change of perspective */ 508 if (flush & FREAD) { 509 selnotify(&pti->pt_selw, 0, NOTE_SUBMIT); 510 cv_broadcast(&tp->t_rawcvf); 511 } 512 if (flush & FWRITE) { 513 selnotify(&pti->pt_selr, 0, NOTE_SUBMIT); 514 cv_broadcast(&tp->t_outcvf); 515 } 516 } 517 518 void 519 ptcwakeup(struct tty *tp, int flag) 520 { 521 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 522 523 mutex_spin_enter(&tty_lock); 524 if (flag & FREAD) { 525 selnotify(&pti->pt_selr, 0, NOTE_SUBMIT); 526 cv_broadcast(&tp->t_outcvf); 527 } 528 if (flag & FWRITE) { 529 selnotify(&pti->pt_selw, 0, NOTE_SUBMIT); 530 cv_broadcast(&tp->t_rawcvf); 531 } 532 mutex_spin_exit(&tty_lock); 533 } 534 535 /*ARGSUSED*/ 536 int 537 ptcopen(dev_t dev, int flag, int devtype, struct lwp *l) 538 { 539 struct pt_softc *pti; 540 struct tty *tp; 541 int error; 542 int ptn = minor(dev); 543 544 if ((error = pty_check(ptn)) != 0) 545 return (error); 546 547 pti = pt_softc[ptn]; 548 tp = pti->pt_tty; 549 550 mutex_spin_enter(&tty_lock); 551 if (tp->t_oproc) { 552 mutex_spin_exit(&tty_lock); 553 return (EIO); 554 } 555 tp->t_oproc = ptsstart; 556 mutex_spin_exit(&tty_lock); 557 (void)(*tp->t_linesw->l_modem)(tp, 1); 558 CLR(tp->t_lflag, EXTPROC); 559 pti->pt_flags = 0; 560 pti->pt_send = 0; 561 pti->pt_ucntl = 0; 562 return (0); 563 } 564 565 /*ARGSUSED*/ 566 int 567 ptcclose(dev_t dev, int flag, int devtype, struct lwp *l) 568 { 569 struct pt_softc *pti = pt_softc[minor(dev)]; 570 struct tty *tp = pti->pt_tty; 571 572 (void)(*tp->t_linesw->l_modem)(tp, 0); 573 mutex_spin_enter(&tty_lock); 574 CLR(tp->t_state, TS_CARR_ON); 575 tp->t_oproc = 0; /* mark closed */ 576 mutex_spin_exit(&tty_lock); 577 return (0); 578 } 579 580 int 581 ptcread(dev_t dev, struct uio *uio, int flag) 582 { 583 struct pt_softc *pti = pt_softc[minor(dev)]; 584 struct tty *tp = pti->pt_tty; 585 u_char bf[BUFSIZ]; 586 int error = 0, cc; 587 int c; 588 589 if (uio->uio_resid <= 0) 590 return EINVAL; 591 592 /* 593 * We want to block until the slave 594 * is open, and there's something to read; 595 * but if we lost the slave or we're NBIO, 596 * then return the appropriate error instead. 597 */ 598 mutex_spin_enter(&tty_lock); 599 for (;;) { 600 if (ISSET(tp->t_state, TS_ISOPEN)) { 601 if (pti->pt_flags & PF_PKT && (c = pti->pt_send)) { 602 pti->pt_send = 0; 603 mutex_spin_exit(&tty_lock); 604 error = ureadc(c, uio); 605 if (error) 606 return (error); 607 /* 608 * Since we don't have the tty locked, there's 609 * a risk of messing up `t_termios'. This is 610 * relevant only if the tty got closed and then 611 * opened again while we were out uiomoving. 612 */ 613 if (pti->pt_send & TIOCPKT_IOCTL) { 614 cc = min(uio->uio_resid, 615 sizeof(tp->t_termios)); 616 uiomove((void *) &tp->t_termios, 617 cc, uio); 618 } 619 return (0); 620 } 621 if (pti->pt_flags & PF_UCNTL && (c = pti->pt_ucntl)) { 622 pti->pt_ucntl = 0; 623 mutex_spin_exit(&tty_lock); 624 error = ureadc(c, uio); 625 if (error) 626 return (error); 627 return (0); 628 } 629 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 630 break; 631 } 632 if (!ISSET(tp->t_state, TS_CARR_ON)) { 633 error = 0; /* EOF */ 634 goto out; 635 } 636 if (flag & IO_NDELAY) { 637 error = EWOULDBLOCK; 638 goto out; 639 } 640 error = cv_wait_sig(&tp->t_outcvf, &tty_lock); 641 if (error) 642 goto out; 643 } 644 645 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) { 646 mutex_spin_exit(&tty_lock); 647 error = ureadc(0, uio); 648 mutex_spin_enter(&tty_lock); 649 if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) 650 error = EIO; 651 } 652 while (uio->uio_resid > 0 && error == 0) { 653 cc = q_to_b(&tp->t_outq, bf, min(uio->uio_resid, BUFSIZ)); 654 if (cc <= 0) 655 break; 656 mutex_spin_exit(&tty_lock); 657 error = uiomove(bf, cc, uio); 658 mutex_spin_enter(&tty_lock); 659 if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) 660 error = EIO; 661 } 662 ttypull(tp); 663 out: 664 mutex_spin_exit(&tty_lock); 665 return (error); 666 } 667 668 669 int 670 ptcwrite(dev_t dev, struct uio *uio, int flag) 671 { 672 struct pt_softc *pti = pt_softc[minor(dev)]; 673 struct tty *tp = pti->pt_tty; 674 u_char *cp = NULL; 675 int cc = 0; 676 u_char locbuf[BUFSIZ]; 677 int cnt = 0; 678 int error = 0; 679 680 again: 681 mutex_spin_enter(&tty_lock); 682 if (!ISSET(tp->t_state, TS_ISOPEN)) 683 goto block; 684 if (pti->pt_flags & PF_REMOTE) { 685 if (tp->t_canq.c_cc) 686 goto block; 687 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 688 if (cc == 0) { 689 cc = min(uio->uio_resid, BUFSIZ); 690 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 691 cp = locbuf; 692 mutex_spin_exit(&tty_lock); 693 error = uiomove((void *)cp, cc, uio); 694 if (error) 695 return (error); 696 mutex_spin_enter(&tty_lock); 697 /* check again for safety */ 698 if (!ISSET(tp->t_state, TS_ISOPEN)) { 699 /* 700 * adjust for data copied in but not 701 * written 702 */ 703 uio->uio_resid += cc; 704 error = EIO; 705 goto out; 706 } 707 } 708 if (cc) 709 (void) b_to_q(cp, cc, &tp->t_canq); 710 cc = 0; 711 } 712 (void) putc(0, &tp->t_canq); 713 ttwakeup(tp); 714 cv_broadcast(&tp->t_cancv); 715 error = 0; 716 goto out; 717 } 718 while (uio->uio_resid > 0) { 719 if (cc == 0) { 720 cc = min(uio->uio_resid, BUFSIZ); 721 cp = locbuf; 722 mutex_spin_exit(&tty_lock); 723 error = uiomove((void *)cp, cc, uio); 724 if (error) 725 return (error); 726 mutex_spin_enter(&tty_lock); 727 /* check again for safety */ 728 if (!ISSET(tp->t_state, TS_ISOPEN)) { 729 /* adjust for data copied in but not written */ 730 uio->uio_resid += cc; 731 error = EIO; 732 goto out; 733 } 734 } 735 while (cc > 0) { 736 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 737 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_lflag, ICANON))) { 738 cv_broadcast(&tp->t_rawcv); 739 goto block; 740 } 741 /* XXX - should change l_rint to be called with lock 742 * see also tty.c:ttyinput_wlock() 743 */ 744 mutex_spin_exit(&tty_lock); 745 (*tp->t_linesw->l_rint)(*cp++, tp); 746 mutex_spin_enter(&tty_lock); 747 cnt++; 748 cc--; 749 } 750 cc = 0; 751 } 752 error = 0; 753 goto out; 754 755 block: 756 /* 757 * Come here to wait for slave to open, for space 758 * in outq, or space in rawq. 759 */ 760 if (!ISSET(tp->t_state, TS_CARR_ON)) { 761 /* adjust for data copied in but not written */ 762 uio->uio_resid += cc; 763 error = EIO; 764 goto out; 765 } 766 if (flag & IO_NDELAY) { 767 /* adjust for data copied in but not written */ 768 uio->uio_resid += cc; 769 error = cnt == 0 ? EWOULDBLOCK : 0; 770 goto out; 771 } 772 error = cv_wait_sig(&tp->t_rawcvf, &tty_lock); 773 mutex_spin_exit(&tty_lock); 774 if (error) { 775 /* adjust for data copied in but not written */ 776 uio->uio_resid += cc; 777 return (error); 778 } 779 goto again; 780 781 out: 782 mutex_spin_exit(&tty_lock); 783 return (error); 784 } 785 786 int 787 ptcpoll(dev_t dev, int events, struct lwp *l) 788 { 789 struct pt_softc *pti = pt_softc[minor(dev)]; 790 struct tty *tp = pti->pt_tty; 791 int revents = 0; 792 793 mutex_spin_enter(&tty_lock); 794 795 if (events & (POLLIN | POLLRDNORM)) 796 if (ISSET(tp->t_state, TS_ISOPEN) && 797 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 798 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 799 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 800 revents |= events & (POLLIN | POLLRDNORM); 801 802 if (events & (POLLOUT | POLLWRNORM)) 803 if (ISSET(tp->t_state, TS_ISOPEN) && 804 ((pti->pt_flags & PF_REMOTE) ? 805 (tp->t_canq.c_cc == 0) : 806 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 807 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))) 808 revents |= events & (POLLOUT | POLLWRNORM); 809 810 if (events & POLLHUP) 811 if (!ISSET(tp->t_state, TS_CARR_ON)) 812 revents |= POLLHUP; 813 814 if (revents == 0) { 815 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 816 selrecord(l, &pti->pt_selr); 817 818 if (events & (POLLOUT | POLLWRNORM)) 819 selrecord(l, &pti->pt_selw); 820 } 821 822 mutex_spin_exit(&tty_lock); 823 824 return (revents); 825 } 826 827 static void 828 filt_ptcrdetach(struct knote *kn) 829 { 830 struct pt_softc *pti; 831 struct tty *tp; 832 833 pti = kn->kn_hook; 834 tp = pti->pt_tty; 835 836 mutex_spin_enter(&tty_lock); 837 SLIST_REMOVE(&pti->pt_selr.sel_klist, kn, knote, kn_selnext); 838 mutex_spin_exit(&tty_lock); 839 } 840 841 static int 842 filt_ptcread(struct knote *kn, long hint) 843 { 844 struct pt_softc *pti; 845 struct tty *tp; 846 int canread; 847 848 pti = kn->kn_hook; 849 tp = pti->pt_tty; 850 851 if ((hint & NOTE_SUBMIT) == 0) { 852 mutex_spin_enter(&tty_lock); 853 } 854 855 canread = (ISSET(tp->t_state, TS_ISOPEN) && 856 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 857 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 858 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))); 859 860 if (canread) { 861 /* 862 * c_cc is number of characters after output post-processing; 863 * the amount of data actually read(2) depends on 864 * setting of input flags for the terminal. 865 */ 866 kn->kn_data = tp->t_outq.c_cc; 867 if (((pti->pt_flags & PF_PKT) && pti->pt_send) || 868 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)) 869 kn->kn_data++; 870 } 871 872 if ((hint & NOTE_SUBMIT) == 0) { 873 mutex_spin_exit(&tty_lock); 874 } 875 876 return (canread); 877 } 878 879 static void 880 filt_ptcwdetach(struct knote *kn) 881 { 882 struct pt_softc *pti; 883 struct tty *tp; 884 885 pti = kn->kn_hook; 886 tp = pti->pt_tty; 887 888 mutex_spin_enter(&tty_lock); 889 SLIST_REMOVE(&pti->pt_selw.sel_klist, kn, knote, kn_selnext); 890 mutex_spin_exit(&tty_lock); 891 } 892 893 static int 894 filt_ptcwrite(struct knote *kn, long hint) 895 { 896 struct pt_softc *pti; 897 struct tty *tp; 898 int canwrite; 899 int nwrite; 900 901 pti = kn->kn_hook; 902 tp = pti->pt_tty; 903 904 if ((hint & NOTE_SUBMIT) == 0) { 905 mutex_spin_enter(&tty_lock); 906 } 907 908 canwrite = (ISSET(tp->t_state, TS_ISOPEN) && 909 ((pti->pt_flags & PF_REMOTE) ? 910 (tp->t_canq.c_cc == 0) : 911 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 912 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))); 913 914 if (canwrite) { 915 if (pti->pt_flags & PF_REMOTE) 916 nwrite = tp->t_canq.c_cn; 917 else { 918 /* this is guaranteed to be > 0 due to above check */ 919 nwrite = tp->t_canq.c_cn 920 - (tp->t_rawq.c_cc + tp->t_canq.c_cc); 921 } 922 kn->kn_data = nwrite; 923 } 924 925 if ((hint & NOTE_SUBMIT) == 0) { 926 mutex_spin_exit(&tty_lock); 927 } 928 929 return (canwrite); 930 } 931 932 static const struct filterops ptcread_filtops = 933 { 1, NULL, filt_ptcrdetach, filt_ptcread }; 934 static const struct filterops ptcwrite_filtops = 935 { 1, NULL, filt_ptcwdetach, filt_ptcwrite }; 936 937 int 938 ptckqfilter(dev_t dev, struct knote *kn) 939 { 940 struct pt_softc *pti = pt_softc[minor(dev)]; 941 struct klist *klist; 942 943 switch (kn->kn_filter) { 944 case EVFILT_READ: 945 klist = &pti->pt_selr.sel_klist; 946 kn->kn_fop = &ptcread_filtops; 947 break; 948 case EVFILT_WRITE: 949 klist = &pti->pt_selw.sel_klist; 950 kn->kn_fop = &ptcwrite_filtops; 951 break; 952 default: 953 return (EINVAL); 954 } 955 956 kn->kn_hook = pti; 957 958 mutex_spin_enter(&tty_lock); 959 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 960 mutex_spin_exit(&tty_lock); 961 962 return (0); 963 } 964 965 struct tty * 966 ptytty(dev_t dev) 967 { 968 struct pt_softc *pti = pt_softc[minor(dev)]; 969 struct tty *tp = pti->pt_tty; 970 971 return (tp); 972 } 973 974 /*ARGSUSED*/ 975 int 976 ptyioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 977 { 978 struct pt_softc *pti = pt_softc[minor(dev)]; 979 struct tty *tp = pti->pt_tty; 980 const struct cdevsw *cdev; 981 u_char *cc = tp->t_cc; 982 int stop, error, sig; 983 984 /* 985 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 986 * ttywflush(tp) will hang if there are characters in the outq. 987 */ 988 if (cmd == TIOCEXT) { 989 /* 990 * When the EXTPROC bit is being toggled, we need 991 * to send an TIOCPKT_IOCTL if the packet driver 992 * is turned on. 993 */ 994 if (*(int *)data) { 995 if (pti->pt_flags & PF_PKT) { 996 pti->pt_send |= TIOCPKT_IOCTL; 997 ptcwakeup(tp, FREAD); 998 } 999 SET(tp->t_lflag, EXTPROC); 1000 } else { 1001 if (ISSET(tp->t_lflag, EXTPROC) && 1002 (pti->pt_flags & PF_PKT)) { 1003 pti->pt_send |= TIOCPKT_IOCTL; 1004 ptcwakeup(tp, FREAD); 1005 } 1006 CLR(tp->t_lflag, EXTPROC); 1007 } 1008 return(0); 1009 } 1010 1011 #ifndef NO_DEV_PTM 1012 /* Allow getting the name from either the master or the slave */ 1013 if (cmd == TIOCPTSNAME) 1014 return pty_fill_ptmget(l, dev, -1, -1, data); 1015 #endif 1016 1017 cdev = cdevsw_lookup(dev); 1018 if (cdev != NULL && cdev->d_open == ptcopen) 1019 switch (cmd) { 1020 #ifndef NO_DEV_PTM 1021 case TIOCGRANTPT: 1022 return pty_grant_slave(l, dev); 1023 #endif 1024 1025 case TIOCGPGRP: 1026 /* 1027 * We avoid calling ttioctl on the controller since, 1028 * in that case, tp must be the controlling terminal. 1029 */ 1030 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1031 return (0); 1032 1033 case TIOCPKT: 1034 if (*(int *)data) { 1035 if (pti->pt_flags & PF_UCNTL) 1036 return (EINVAL); 1037 pti->pt_flags |= PF_PKT; 1038 } else 1039 pti->pt_flags &= ~PF_PKT; 1040 return (0); 1041 1042 case TIOCUCNTL: 1043 if (*(int *)data) { 1044 if (pti->pt_flags & PF_PKT) 1045 return (EINVAL); 1046 pti->pt_flags |= PF_UCNTL; 1047 } else 1048 pti->pt_flags &= ~PF_UCNTL; 1049 return (0); 1050 1051 case TIOCREMOTE: 1052 if (*(int *)data) 1053 pti->pt_flags |= PF_REMOTE; 1054 else 1055 pti->pt_flags &= ~PF_REMOTE; 1056 mutex_spin_enter(&tty_lock); 1057 ttyflush(tp, FREAD|FWRITE); 1058 mutex_spin_exit(&tty_lock); 1059 return (0); 1060 1061 case TIOCSETP: 1062 case TIOCSETN: 1063 case TIOCSETD: 1064 case TIOCSETA: 1065 case TIOCSETAW: 1066 case TIOCSETAF: 1067 mutex_spin_enter(&tty_lock); 1068 ndflush(&tp->t_outq, tp->t_outq.c_cc); 1069 mutex_spin_exit(&tty_lock); 1070 break; 1071 1072 case TIOCSIG: 1073 sig = (int)(long)*(void **)data; 1074 if (sig <= 0 || sig >= NSIG) 1075 return (EINVAL); 1076 mutex_spin_enter(&tty_lock); 1077 if (!ISSET(tp->t_lflag, NOFLSH)) 1078 ttyflush(tp, FREAD|FWRITE); 1079 tp->t_state |= TS_SIGINFO; 1080 ttysig(tp, TTYSIG_PG1, sig); 1081 mutex_spin_exit(&tty_lock); 1082 return (0); 1083 1084 case FIONREAD: 1085 mutex_spin_enter(&tty_lock); 1086 *(int *)data = tp->t_outq.c_cc; 1087 mutex_spin_exit(&tty_lock); 1088 return (0); 1089 } 1090 1091 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 1092 if (error == EPASSTHROUGH) 1093 error = ttioctl(tp, cmd, data, flag, l); 1094 if (error == EPASSTHROUGH) { 1095 if (pti->pt_flags & PF_UCNTL && 1096 (cmd & ~0xff) == UIOCCMD(0)) { 1097 if (cmd & 0xff) { 1098 pti->pt_ucntl = (u_char)cmd; 1099 ptcwakeup(tp, FREAD); 1100 } 1101 return (0); 1102 } 1103 } 1104 /* 1105 * If external processing and packet mode send ioctl packet. 1106 */ 1107 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 1108 switch(cmd) { 1109 case TIOCSETA: 1110 case TIOCSETAW: 1111 case TIOCSETAF: 1112 case TIOCSETP: 1113 case TIOCSETN: 1114 case TIOCSETC: 1115 case TIOCSLTC: 1116 case TIOCLBIS: 1117 case TIOCLBIC: 1118 case TIOCLSET: 1119 pti->pt_send |= TIOCPKT_IOCTL; 1120 ptcwakeup(tp, FREAD); 1121 default: 1122 break; 1123 } 1124 } 1125 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 1126 && CCEQ(cc[VSTART], CTRL('q')); 1127 if (pti->pt_flags & PF_NOSTOP) { 1128 if (stop) { 1129 pti->pt_send &= ~TIOCPKT_NOSTOP; 1130 pti->pt_send |= TIOCPKT_DOSTOP; 1131 pti->pt_flags &= ~PF_NOSTOP; 1132 ptcwakeup(tp, FREAD); 1133 } 1134 } else { 1135 if (!stop) { 1136 pti->pt_send &= ~TIOCPKT_DOSTOP; 1137 pti->pt_send |= TIOCPKT_NOSTOP; 1138 pti->pt_flags |= PF_NOSTOP; 1139 ptcwakeup(tp, FREAD); 1140 } 1141 } 1142 return (error); 1143 } 1144