1 /* $NetBSD: tty_pty.c,v 1.139 2014/05/22 16:28:06 dholland 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 1.139 2014/05/22 16:28:06 dholland Exp $"); 41 42 #include "opt_ptm.h" 43 44 #define TTY_ALLOW_PRIVATE 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/ioctl.h> 49 #include <sys/ioctl_compat.h> 50 #include <sys/proc.h> 51 #include <sys/tty.h> 52 #include <sys/stat.h> 53 #include <sys/file.h> 54 #include <sys/kernel.h> 55 #include <sys/vnode.h> 56 #include <sys/namei.h> 57 #include <sys/signalvar.h> 58 #include <sys/uio.h> 59 #include <sys/filedesc.h> 60 #include <sys/conf.h> 61 #include <sys/poll.h> 62 #include <sys/pty.h> 63 #include <sys/kauth.h> 64 65 #define DEFAULT_NPTYS 16 /* default number of initial ptys */ 66 #define DEFAULT_MAXPTYS 992 /* default maximum number of ptys */ 67 68 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 69 70 struct pt_softc { 71 struct tty *pt_tty; 72 int pt_flags; 73 struct selinfo pt_selr, pt_selw; 74 u_char pt_send; 75 u_char pt_ucntl; 76 }; 77 78 static struct pt_softc **pt_softc = NULL; /* pty array */ 79 static int maxptys = DEFAULT_MAXPTYS; /* maximum number of ptys (sysctable) */ 80 kmutex_t pt_softc_mutex; 81 int npty = 0; /* for pstat -t */ 82 83 #define PF_PKT 0x08 /* packet mode */ 84 #define PF_STOPPED 0x10 /* user told stopped */ 85 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 86 #define PF_NOSTOP 0x40 87 #define PF_UCNTL 0x80 /* user control mode */ 88 89 void ptyattach(int); 90 void ptcwakeup(struct tty *, int); 91 void ptsstart(struct tty *); 92 int pty_maxptys(int, int); 93 94 static struct pt_softc **ptyarralloc(int); 95 96 dev_type_open(ptcopen); 97 dev_type_close(ptcclose); 98 dev_type_read(ptcread); 99 dev_type_write(ptcwrite); 100 dev_type_poll(ptcpoll); 101 dev_type_kqfilter(ptckqfilter); 102 103 dev_type_open(ptsopen); 104 dev_type_close(ptsclose); 105 dev_type_read(ptsread); 106 dev_type_write(ptswrite); 107 dev_type_stop(ptsstop); 108 dev_type_poll(ptspoll); 109 110 dev_type_ioctl(ptyioctl); 111 dev_type_tty(ptytty); 112 113 const struct cdevsw ptc_cdevsw = { 114 .d_open = ptcopen, 115 .d_close = ptcclose, 116 .d_read = ptcread, 117 .d_write = ptcwrite, 118 .d_ioctl = ptyioctl, 119 .d_stop = nullstop, 120 .d_tty = ptytty, 121 .d_poll = ptcpoll, 122 .d_mmap = nommap, 123 .d_kqfilter = ptckqfilter, 124 .d_flag = D_TTY 125 }; 126 127 const struct cdevsw pts_cdevsw = { 128 .d_open = ptsopen, 129 .d_close = ptsclose, 130 .d_read = ptsread, 131 .d_write = ptswrite, 132 .d_ioctl = ptyioctl, 133 .d_stop = ptsstop, 134 .d_tty = ptytty, 135 .d_poll = ptspoll, 136 .d_mmap = nommap, 137 .d_kqfilter = ttykqfilter, 138 .d_flag = D_TTY 139 }; 140 141 #if defined(pmax) 142 /* 143 * Used by arch/pmax/conf/majors.pmax, which needs a second copy as it 144 * needs to map this stuff to two pairs of majors. 145 */ 146 147 const struct cdevsw ptc_ultrix_cdevsw = { 148 .d_open = ptcopen, 149 .d_close = ptcclose, 150 .d_read = ptcread, 151 .d_write = ptcwrite, 152 .d_ioctl = ptyioctl, 153 .d_stop = nullstop, 154 .d_tty = ptytty, 155 .d_poll = ptcpoll, 156 .d_mmap = nommap, 157 .d_kqfilter = ptckqfilter, 158 .d_flag = D_TTY 159 }; 160 161 const struct cdevsw pts_ultrix_cdevsw = { 162 .d_open = ptsopen, 163 .d_close = ptsclose, 164 .d_read = ptsread, 165 .d_write = ptswrite, 166 .d_ioctl = ptyioctl, 167 .d_stop = ptsstop, 168 .d_tty = ptytty, 169 .d_poll = ptspoll, 170 .d_mmap = nommap, 171 .d_kqfilter = ttykqfilter, 172 .d_flag = D_TTY 173 }; 174 #endif /* defined(pmax) */ 175 176 /* 177 * Check if a pty is free to use. 178 */ 179 int 180 pty_isfree(int minor, int lock) 181 { 182 struct pt_softc *pt = pt_softc[minor]; 183 if (lock) 184 mutex_enter(&pt_softc_mutex); 185 minor = pt == NULL || pt->pt_tty == NULL || 186 pt->pt_tty->t_oproc == NULL; 187 if (lock) 188 mutex_exit(&pt_softc_mutex); 189 return minor; 190 } 191 192 /* 193 * Allocate and zero array of nelem elements. 194 */ 195 static struct pt_softc ** 196 ptyarralloc(int nelem) 197 { 198 struct pt_softc **pt; 199 nelem += 10; 200 pt = kmem_zalloc(nelem * sizeof(*pt), KM_SLEEP); 201 return pt; 202 } 203 204 static void 205 ptyarrfree(struct pt_softc **pt, int nelem) 206 { 207 208 nelem += 10; 209 kmem_free(pt, nelem * sizeof(*pt)); 210 } 211 212 /* 213 * Check if the minor is correct and ensure necessary structures 214 * are properly allocated. 215 */ 216 int 217 pty_check(int ptn) 218 { 219 struct pt_softc *pti; 220 221 if (ptn >= npty) { 222 struct pt_softc **newpt, **oldpt; 223 int newnpty; 224 int oldnpty; 225 226 /* check if the requested pty can be granted */ 227 if (ptn >= maxptys) { 228 limit_reached: 229 tablefull("pty", "increase kern.maxptys"); 230 return ENXIO; 231 } 232 233 /* Allocate a larger pty array */ 234 for (newnpty = npty; newnpty <= ptn;) 235 newnpty *= 2; 236 if (newnpty > maxptys) 237 newnpty = maxptys; 238 newpt = ptyarralloc(newnpty); 239 240 /* 241 * Now grab the pty array mutex - we need to ensure 242 * that the pty array is consistent while copying it's 243 * content to newly allocated, larger space; we also 244 * need to be safe against pty_maxptys(). 245 */ 246 mutex_enter(&pt_softc_mutex); 247 248 if (newnpty >= maxptys) { 249 /* limit cut away beneath us... */ 250 if (ptn >= maxptys) { 251 mutex_exit(&pt_softc_mutex); 252 ptyarrfree(newpt, newnpty); 253 goto limit_reached; 254 } 255 newnpty = maxptys; 256 } 257 258 /* 259 * If the pty array was not enlarged while we were waiting 260 * for mutex, copy current contents of pt_softc[] to newly 261 * allocated array and start using the new bigger array. 262 */ 263 if (newnpty > npty) { 264 memcpy(newpt, pt_softc, npty*sizeof(struct pt_softc *)); 265 oldpt = pt_softc; 266 oldnpty = npty; 267 pt_softc = newpt; 268 npty = newnpty; 269 } else { 270 /* was enlarged when waited for lock, free new space */ 271 oldpt = newpt; 272 oldnpty = newnpty; 273 } 274 275 mutex_exit(&pt_softc_mutex); 276 ptyarrfree(oldpt, oldnpty); 277 } 278 279 /* 280 * If the entry is not yet allocated, allocate one. The mutex is 281 * needed so that the state of pt_softc[] array is consistant 282 * in case it has been lengthened above. 283 */ 284 if (!pt_softc[ptn]) { 285 pti = kmem_zalloc(sizeof(*pti), KM_SLEEP); 286 287 selinit(&pti->pt_selr); 288 selinit(&pti->pt_selw); 289 pti->pt_tty = tty_alloc(); 290 291 mutex_enter(&pt_softc_mutex); 292 293 /* 294 * Check the entry again - it might have been 295 * added while we were waiting for mutex. 296 */ 297 if (pt_softc[ptn]) { 298 mutex_exit(&pt_softc_mutex); 299 tty_free(pti->pt_tty); 300 seldestroy(&pti->pt_selr); 301 seldestroy(&pti->pt_selw); 302 kmem_free(pti, sizeof(*pti)); 303 return 0; 304 } 305 tty_attach(pti->pt_tty); 306 pt_softc[ptn] = pti; 307 308 mutex_exit(&pt_softc_mutex); 309 } 310 311 return 0; 312 } 313 314 /* 315 * Set maxpty in thread-safe way. Returns 0 in case of error, otherwise 316 * new value of maxptys. 317 */ 318 int 319 pty_maxptys(int newmax, int set) 320 { 321 if (!set) 322 return maxptys; 323 324 /* 325 * We have to grab the pt_softc lock, so that we would pick correct 326 * value of npty (might be modified in pty_check()). 327 */ 328 mutex_enter(&pt_softc_mutex); 329 330 /* 331 * The value cannot be set to value lower than the highest pty 332 * number ever allocated. 333 */ 334 if (newmax >= npty) 335 maxptys = newmax; 336 else 337 newmax = 0; 338 339 mutex_exit(&pt_softc_mutex); 340 341 return newmax; 342 } 343 344 /* 345 * Establish n (or default if n is 1) ptys in the system. 346 */ 347 void 348 ptyattach(int n) 349 { 350 351 mutex_init(&pt_softc_mutex, MUTEX_DEFAULT, IPL_NONE); 352 353 /* maybe should allow 0 => none? */ 354 if (n <= 1) 355 n = DEFAULT_NPTYS; 356 pt_softc = ptyarralloc(n); 357 npty = n; 358 #ifndef NO_DEV_PTM 359 ptmattach(1); 360 #endif 361 } 362 363 /*ARGSUSED*/ 364 int 365 ptsopen(dev_t dev, int flag, int devtype, struct lwp *l) 366 { 367 struct pt_softc *pti; 368 struct tty *tp; 369 int error; 370 int ptn = minor(dev); 371 372 if ((error = pty_check(ptn)) != 0) 373 return error; 374 375 mutex_spin_enter(&tty_lock); 376 pti = pt_softc[ptn]; 377 tp = pti->pt_tty; 378 if (!ISSET(tp->t_state, TS_ISOPEN)) { 379 tp->t_dev = dev; 380 ttychars(tp); /* Set up default chars */ 381 tp->t_iflag = TTYDEF_IFLAG; 382 tp->t_oflag = TTYDEF_OFLAG; 383 tp->t_lflag = TTYDEF_LFLAG; 384 tp->t_cflag = TTYDEF_CFLAG; 385 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 386 ttsetwater(tp); /* would be done in xxparam() */ 387 } else if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, 388 tp) != 0) { 389 mutex_spin_exit(&tty_lock); 390 return EBUSY; 391 } 392 if (tp->t_oproc) /* Ctrlr still around. */ 393 SET(tp->t_state, TS_CARR_ON); 394 if (!ISSET(flag, O_NONBLOCK)) { 395 while (!ISSET(tp->t_state, TS_CARR_ON)) { 396 tp->t_wopen++; 397 error = ttysleep(tp, &tp->t_rawcv, true, 0); 398 tp->t_wopen--; 399 if (error != 0) { 400 mutex_spin_exit(&tty_lock); 401 return error; 402 } 403 } 404 } 405 mutex_spin_exit(&tty_lock); 406 error = (*tp->t_linesw->l_open)(dev, tp); 407 ptcwakeup(tp, FREAD|FWRITE); 408 return error; 409 } 410 411 int 412 ptsclose(dev_t dev, int flag, int mode, struct lwp *l) 413 { 414 struct pt_softc *pti = pt_softc[minor(dev)]; 415 struct tty *tp = pti->pt_tty; 416 int error; 417 418 error = (*tp->t_linesw->l_close)(tp, flag); 419 error |= ttyclose(tp); 420 ptcwakeup(tp, FREAD|FWRITE); 421 return error; 422 } 423 424 int 425 ptsread(dev_t dev, struct uio *uio, int flag) 426 { 427 struct proc *p = curproc; 428 struct pt_softc *pti = pt_softc[minor(dev)]; 429 struct tty *tp = pti->pt_tty; 430 int error = 0; 431 int cc, c; 432 433 again: 434 if (pti->pt_flags & PF_REMOTE) { 435 mutex_spin_enter(&tty_lock); 436 while (isbackground(p, tp)) { /* XXXSMP */ 437 if (sigismasked(curlwp, SIGTTIN) || 438 p->p_pgrp->pg_jobc == 0 || 439 p->p_lflag & PL_PPWAIT) { 440 mutex_spin_exit(&tty_lock); 441 return EIO; 442 } 443 ttysig(tp, TTYSIG_PG1, SIGTTIN); 444 error = ttypause(tp, hz); 445 if (error != 0) { 446 mutex_spin_exit(&tty_lock); 447 return error; 448 } 449 } 450 if (tp->t_canq.c_cc == 0) { 451 if (flag & IO_NDELAY) { 452 mutex_spin_exit(&tty_lock); 453 return EWOULDBLOCK; 454 } 455 error = ttysleep(tp, &tp->t_cancv, true, 0); 456 mutex_spin_exit(&tty_lock); 457 if (error != 0) 458 return error; 459 goto again; 460 } 461 while(error == 0 && tp->t_canq.c_cc > 1 && uio->uio_resid > 0) { 462 c = getc(&tp->t_canq); 463 mutex_spin_exit(&tty_lock); 464 error = ureadc(c, uio); 465 mutex_spin_enter(&tty_lock); 466 /* Re-check terminal state here? */ 467 } 468 if (tp->t_canq.c_cc == 1) 469 (void) getc(&tp->t_canq); 470 cc = tp->t_canq.c_cc; 471 mutex_spin_exit(&tty_lock); 472 if (cc) 473 return error; 474 } else if (tp->t_oproc) 475 error = (*tp->t_linesw->l_read)(tp, uio, flag); 476 ptcwakeup(tp, FWRITE); 477 return error; 478 } 479 480 /* 481 * Write to pseudo-tty. 482 * Wakeups of controlling tty will happen 483 * indirectly, when tty driver calls ptsstart. 484 */ 485 int 486 ptswrite(dev_t dev, struct uio *uio, int flag) 487 { 488 struct pt_softc *pti = pt_softc[minor(dev)]; 489 struct tty *tp = pti->pt_tty; 490 491 if (tp->t_oproc == NULL) 492 return EIO; 493 return (*tp->t_linesw->l_write)(tp, uio, flag); 494 } 495 496 /* 497 * Poll pseudo-tty. 498 */ 499 int 500 ptspoll(dev_t dev, int events, struct lwp *l) 501 { 502 struct pt_softc *pti = pt_softc[minor(dev)]; 503 struct tty *tp = pti->pt_tty; 504 505 if (tp->t_oproc == NULL) 506 return POLLHUP; 507 508 return (*tp->t_linesw->l_poll)(tp, events, l); 509 } 510 511 /* 512 * Start output on pseudo-tty. 513 * Wake up process polling or sleeping for input from controlling tty. 514 */ 515 void 516 ptsstart(struct tty *tp) 517 { 518 struct pt_softc *pti; 519 520 KASSERT(tp->t_dev != NODEV); 521 pti = pt_softc[minor(tp->t_dev)]; 522 523 KASSERT(mutex_owned(&tty_lock)); 524 525 if (ISSET(tp->t_state, TS_TTSTOP)) 526 return; 527 if (pti->pt_flags & PF_STOPPED) { 528 pti->pt_flags &= ~PF_STOPPED; 529 pti->pt_send = TIOCPKT_START; 530 } 531 532 selnotify(&pti->pt_selr, 0, NOTE_SUBMIT); 533 cv_broadcast(&tp->t_outcvf); 534 } 535 536 /* 537 * Stop output. 538 */ 539 void 540 ptsstop(struct tty *tp, int flush) 541 { 542 struct pt_softc *pti; 543 544 KASSERT(tp->t_dev != NODEV); 545 pti = pt_softc[minor(tp->t_dev)]; 546 547 KASSERT(mutex_owned(&tty_lock)); 548 549 /* note: FLUSHREAD and FLUSHWRITE already ok */ 550 CTASSERT(TIOCPKT_FLUSHREAD == FREAD); 551 CTASSERT(TIOCPKT_FLUSHWRITE == FWRITE); 552 if (flush == 0) { 553 flush = TIOCPKT_STOP; 554 pti->pt_flags |= PF_STOPPED; 555 } else 556 pti->pt_flags &= ~PF_STOPPED; 557 pti->pt_send |= flush; 558 559 /* change of perspective */ 560 if (flush & FREAD) { 561 selnotify(&pti->pt_selw, 0, NOTE_SUBMIT); 562 cv_broadcast(&tp->t_rawcvf); 563 } 564 if (flush & FWRITE) { 565 selnotify(&pti->pt_selr, 0, NOTE_SUBMIT); 566 cv_broadcast(&tp->t_outcvf); 567 } 568 } 569 570 void 571 ptcwakeup(struct tty *tp, int flag) 572 { 573 struct pt_softc *pti; 574 575 if (tp->t_dev == NODEV) 576 return; /* client side not open yet */ 577 578 pti = pt_softc[minor(tp->t_dev)]; 579 KASSERT(pti != NULL); 580 581 mutex_spin_enter(&tty_lock); 582 if (flag & FREAD) { 583 selnotify(&pti->pt_selr, 0, NOTE_SUBMIT); 584 cv_broadcast(&tp->t_outcvf); 585 } 586 if (flag & FWRITE) { 587 selnotify(&pti->pt_selw, 0, NOTE_SUBMIT); 588 cv_broadcast(&tp->t_rawcvf); 589 } 590 mutex_spin_exit(&tty_lock); 591 } 592 593 /*ARGSUSED*/ 594 int 595 ptcopen(dev_t dev, int flag, int devtype, struct lwp *l) 596 { 597 struct pt_softc *pti; 598 struct tty *tp; 599 int error; 600 int ptn = minor(dev); 601 602 if ((error = pty_check(ptn)) != 0) 603 return error; 604 605 pti = pt_softc[ptn]; 606 tp = pti->pt_tty; 607 608 mutex_spin_enter(&tty_lock); 609 if (tp->t_oproc) { 610 mutex_spin_exit(&tty_lock); 611 return EIO; 612 } 613 tp->t_dev = dev; 614 tp->t_oproc = ptsstart; 615 mutex_spin_exit(&tty_lock); 616 (void)(*tp->t_linesw->l_modem)(tp, 1); 617 CLR(tp->t_lflag, EXTPROC); 618 pti->pt_flags = 0; 619 pti->pt_send = 0; 620 pti->pt_ucntl = 0; 621 return 0; 622 } 623 624 /*ARGSUSED*/ 625 int 626 ptcclose(dev_t dev, int flag, int devtype, struct lwp *l) 627 { 628 struct pt_softc *pti = pt_softc[minor(dev)]; 629 struct tty *tp = pti->pt_tty; 630 631 (void)(*tp->t_linesw->l_modem)(tp, 0); 632 mutex_spin_enter(&tty_lock); 633 CLR(tp->t_state, TS_CARR_ON); 634 tp->t_oproc = NULL; /* mark closed */ 635 mutex_spin_exit(&tty_lock); 636 return 0; 637 } 638 639 int 640 ptcread(dev_t dev, struct uio *uio, int flag) 641 { 642 struct pt_softc *pti = pt_softc[minor(dev)]; 643 struct tty *tp = pti->pt_tty; 644 u_char bf[BUFSIZ]; 645 int error = 0, cc; 646 int c; 647 648 if (uio->uio_resid <= 0) 649 return EINVAL; 650 651 /* 652 * We want to block until the slave 653 * is open, and there's something to read; 654 * but if we lost the slave or we're NBIO, 655 * then return the appropriate error instead. 656 */ 657 mutex_spin_enter(&tty_lock); 658 for (;;) { 659 if (ISSET(tp->t_state, TS_ISOPEN)) { 660 if (pti->pt_flags & PF_PKT && (c = pti->pt_send)) { 661 pti->pt_send = 0; 662 mutex_spin_exit(&tty_lock); 663 error = ureadc(c, uio); 664 if (error != 0) 665 return error; 666 /* 667 * Since we don't have the tty locked, there's 668 * a risk of messing up `t_termios'. This is 669 * relevant only if the tty got closed and then 670 * opened again while we were out uiomoving. 671 */ 672 if (c & TIOCPKT_IOCTL) { 673 cc = min(uio->uio_resid, 674 sizeof(tp->t_termios)); 675 uiomove((void *) &tp->t_termios, 676 cc, uio); 677 } 678 return 0; 679 } 680 if (pti->pt_flags & PF_UCNTL && (c = pti->pt_ucntl)) { 681 pti->pt_ucntl = 0; 682 mutex_spin_exit(&tty_lock); 683 error = ureadc(c, uio); 684 if (error != 0) 685 return error; 686 return 0; 687 } 688 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 689 break; 690 } 691 if (!ISSET(tp->t_state, TS_CARR_ON)) { 692 error = 0; /* EOF */ 693 goto out; 694 } 695 if (flag & IO_NDELAY) { 696 error = EWOULDBLOCK; 697 goto out; 698 } 699 error = cv_wait_sig(&tp->t_outcvf, &tty_lock); 700 if (error != 0) 701 goto out; 702 } 703 704 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) { 705 mutex_spin_exit(&tty_lock); 706 error = ureadc(0, uio); 707 mutex_spin_enter(&tty_lock); 708 if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) 709 error = EIO; 710 } 711 while (uio->uio_resid > 0 && error == 0) { 712 cc = q_to_b(&tp->t_outq, bf, min(uio->uio_resid, BUFSIZ)); 713 if (cc <= 0) 714 break; 715 mutex_spin_exit(&tty_lock); 716 error = uiomove(bf, cc, uio); 717 mutex_spin_enter(&tty_lock); 718 if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) 719 error = EIO; 720 } 721 ttypull(tp); 722 out: 723 mutex_spin_exit(&tty_lock); 724 return error; 725 } 726 727 728 int 729 ptcwrite(dev_t dev, struct uio *uio, int flag) 730 { 731 struct pt_softc *pti = pt_softc[minor(dev)]; 732 struct tty *tp = pti->pt_tty; 733 u_char *cp = NULL; 734 int cc = 0; 735 u_char locbuf[BUFSIZ]; 736 int cnt = 0; 737 int error = 0; 738 739 again: 740 mutex_spin_enter(&tty_lock); 741 if (!ISSET(tp->t_state, TS_ISOPEN)) 742 goto block; 743 if (pti->pt_flags & PF_REMOTE) { 744 if (tp->t_canq.c_cc) 745 goto block; 746 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG) { 747 if (cc == 0) { 748 cc = min(uio->uio_resid, BUFSIZ); 749 cc = min(cc, TTYHOG - tp->t_canq.c_cc); 750 cp = locbuf; 751 mutex_spin_exit(&tty_lock); 752 error = uiomove(cp, cc, uio); 753 if (error != 0) 754 return error; 755 mutex_spin_enter(&tty_lock); 756 /* check again for safety */ 757 if (!ISSET(tp->t_state, TS_ISOPEN)) { 758 /* 759 * adjust for data copied in but not 760 * written 761 */ 762 uio->uio_resid += cc; 763 error = EIO; 764 goto out; 765 } 766 } 767 if (cc) { 768 cc = b_to_q(cp, cc, &tp->t_outq); 769 if (cc > 0) 770 goto block; 771 } 772 } 773 (void) putc(0, &tp->t_canq); 774 ttwakeup(tp); 775 cv_broadcast(&tp->t_cancv); 776 error = 0; 777 goto out; 778 } 779 while (uio->uio_resid > 0) { 780 if (cc == 0) { 781 cc = min(uio->uio_resid, BUFSIZ); 782 cp = locbuf; 783 mutex_spin_exit(&tty_lock); 784 error = uiomove(cp, cc, uio); 785 if (error != 0) 786 return error; 787 mutex_spin_enter(&tty_lock); 788 /* check again for safety */ 789 if (!ISSET(tp->t_state, TS_ISOPEN)) { 790 /* adjust for data copied in but not written */ 791 uio->uio_resid += cc; 792 error = EIO; 793 goto out; 794 } 795 } 796 while (cc > 0) { 797 int used = tp->t_rawq.c_cc + tp->t_canq.c_cc; 798 int canon = ISSET(tp->t_lflag, ICANON) ? 1 : 0; 799 /* 800 * We need space for 2 characters if canonical 801 * because we might need to print ^C 802 */ 803 if (used >= (TTYHOG - canon) && 804 (tp->t_canq.c_cc > 0 || !canon)) { 805 cv_broadcast(&tp->t_rawcv); 806 goto block; 807 } 808 /* 809 * XXX - should change l_rint to be called with lock 810 * see also tty.c:ttyinput_wlock() 811 */ 812 mutex_spin_exit(&tty_lock); 813 (*tp->t_linesw->l_rint)(*cp++, tp); 814 mutex_spin_enter(&tty_lock); 815 cnt++; 816 cc--; 817 } 818 } 819 error = 0; 820 goto out; 821 822 block: 823 /* 824 * Come here to wait for slave to open, for space 825 * in outq, or space in rawq. 826 */ 827 if (!ISSET(tp->t_state, TS_CARR_ON)) { 828 /* adjust for data copied in but not written */ 829 uio->uio_resid += cc; 830 error = EIO; 831 goto out; 832 } 833 if (flag & IO_NDELAY) { 834 /* adjust for data copied in but not written */ 835 uio->uio_resid += cc; 836 error = cnt == 0 ? EWOULDBLOCK : 0; 837 goto out; 838 } 839 error = cv_wait_sig(&tp->t_rawcvf, &tty_lock); 840 mutex_spin_exit(&tty_lock); 841 if (error != 0) { 842 /* adjust for data copied in but not written */ 843 uio->uio_resid += cc; 844 return error; 845 } 846 goto again; 847 848 out: 849 mutex_spin_exit(&tty_lock); 850 return error; 851 } 852 853 int 854 ptcpoll(dev_t dev, int events, struct lwp *l) 855 { 856 struct pt_softc *pti = pt_softc[minor(dev)]; 857 struct tty *tp = pti->pt_tty; 858 int revents = 0; 859 860 mutex_spin_enter(&tty_lock); 861 862 if (events & (POLLIN | POLLRDNORM)) 863 if (ISSET(tp->t_state, TS_ISOPEN) && 864 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 865 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 866 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 867 revents |= events & (POLLIN | POLLRDNORM); 868 869 if (events & (POLLOUT | POLLWRNORM)) 870 if (ISSET(tp->t_state, TS_ISOPEN) && 871 ((pti->pt_flags & PF_REMOTE) ? 872 (tp->t_canq.c_cc == 0) : 873 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 874 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))) 875 revents |= events & (POLLOUT | POLLWRNORM); 876 877 if (events & POLLHUP) 878 if (!ISSET(tp->t_state, TS_CARR_ON)) 879 revents |= POLLHUP; 880 881 if (revents == 0) { 882 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 883 selrecord(l, &pti->pt_selr); 884 885 if (events & (POLLOUT | POLLWRNORM)) 886 selrecord(l, &pti->pt_selw); 887 } 888 889 mutex_spin_exit(&tty_lock); 890 891 return revents; 892 } 893 894 static void 895 filt_ptcrdetach(struct knote *kn) 896 { 897 struct pt_softc *pti; 898 899 pti = kn->kn_hook; 900 901 mutex_spin_enter(&tty_lock); 902 SLIST_REMOVE(&pti->pt_selr.sel_klist, kn, knote, kn_selnext); 903 mutex_spin_exit(&tty_lock); 904 } 905 906 static int 907 filt_ptcread(struct knote *kn, long hint) 908 { 909 struct pt_softc *pti; 910 struct tty *tp; 911 int canread; 912 913 pti = kn->kn_hook; 914 tp = pti->pt_tty; 915 916 if ((hint & NOTE_SUBMIT) == 0) { 917 mutex_spin_enter(&tty_lock); 918 } 919 920 canread = (ISSET(tp->t_state, TS_ISOPEN) && 921 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 922 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 923 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))); 924 925 if (canread) { 926 /* 927 * c_cc is number of characters after output post-processing; 928 * the amount of data actually read(2) depends on 929 * setting of input flags for the terminal. 930 */ 931 kn->kn_data = tp->t_outq.c_cc; 932 if (((pti->pt_flags & PF_PKT) && pti->pt_send) || 933 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)) 934 kn->kn_data++; 935 } 936 937 if ((hint & NOTE_SUBMIT) == 0) { 938 mutex_spin_exit(&tty_lock); 939 } 940 941 return canread; 942 } 943 944 static void 945 filt_ptcwdetach(struct knote *kn) 946 { 947 struct pt_softc *pti; 948 949 pti = kn->kn_hook; 950 951 mutex_spin_enter(&tty_lock); 952 SLIST_REMOVE(&pti->pt_selw.sel_klist, kn, knote, kn_selnext); 953 mutex_spin_exit(&tty_lock); 954 } 955 956 static int 957 filt_ptcwrite(struct knote *kn, long hint) 958 { 959 struct pt_softc *pti; 960 struct tty *tp; 961 int canwrite; 962 int nwrite; 963 964 pti = kn->kn_hook; 965 tp = pti->pt_tty; 966 967 if ((hint & NOTE_SUBMIT) == 0) { 968 mutex_spin_enter(&tty_lock); 969 } 970 971 canwrite = (ISSET(tp->t_state, TS_ISOPEN) && 972 ((pti->pt_flags & PF_REMOTE) ? 973 (tp->t_canq.c_cc == 0) : 974 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 975 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))); 976 977 if (canwrite) { 978 if (pti->pt_flags & PF_REMOTE) 979 nwrite = tp->t_canq.c_cn; 980 else { 981 /* this is guaranteed to be > 0 due to above check */ 982 nwrite = tp->t_canq.c_cn 983 - (tp->t_rawq.c_cc + tp->t_canq.c_cc); 984 } 985 kn->kn_data = nwrite; 986 } 987 988 if ((hint & NOTE_SUBMIT) == 0) { 989 mutex_spin_exit(&tty_lock); 990 } 991 992 return canwrite; 993 } 994 995 static const struct filterops ptcread_filtops = 996 { 1, NULL, filt_ptcrdetach, filt_ptcread }; 997 static const struct filterops ptcwrite_filtops = 998 { 1, NULL, filt_ptcwdetach, filt_ptcwrite }; 999 1000 int 1001 ptckqfilter(dev_t dev, struct knote *kn) 1002 { 1003 struct pt_softc *pti = pt_softc[minor(dev)]; 1004 struct klist *klist; 1005 1006 switch (kn->kn_filter) { 1007 case EVFILT_READ: 1008 klist = &pti->pt_selr.sel_klist; 1009 kn->kn_fop = &ptcread_filtops; 1010 break; 1011 case EVFILT_WRITE: 1012 klist = &pti->pt_selw.sel_klist; 1013 kn->kn_fop = &ptcwrite_filtops; 1014 break; 1015 default: 1016 return EINVAL; 1017 } 1018 1019 kn->kn_hook = pti; 1020 1021 mutex_spin_enter(&tty_lock); 1022 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 1023 mutex_spin_exit(&tty_lock); 1024 1025 return 0; 1026 } 1027 1028 struct tty * 1029 ptytty(dev_t dev) 1030 { 1031 struct pt_softc *pti = pt_softc[minor(dev)]; 1032 struct tty *tp = pti->pt_tty; 1033 1034 return tp; 1035 } 1036 1037 /*ARGSUSED*/ 1038 int 1039 ptyioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 1040 { 1041 struct pt_softc *pti = pt_softc[minor(dev)]; 1042 struct tty *tp = pti->pt_tty; 1043 const struct cdevsw *cdev; 1044 u_char *cc = tp->t_cc; 1045 int stop, error, sig; 1046 #ifndef NO_DEV_PTM 1047 struct mount *mp; 1048 #endif 1049 1050 /* 1051 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 1052 * ttywflush(tp) will hang if there are characters in the outq. 1053 */ 1054 if (cmd == TIOCEXT) { 1055 /* 1056 * When the EXTPROC bit is being toggled, we need 1057 * to send an TIOCPKT_IOCTL if the packet driver 1058 * is turned on. 1059 */ 1060 if (*(int *)data) { 1061 if (pti->pt_flags & PF_PKT) { 1062 pti->pt_send |= TIOCPKT_IOCTL; 1063 ptcwakeup(tp, FREAD); 1064 } 1065 SET(tp->t_lflag, EXTPROC); 1066 } else { 1067 if (ISSET(tp->t_lflag, EXTPROC) && 1068 (pti->pt_flags & PF_PKT)) { 1069 pti->pt_send |= TIOCPKT_IOCTL; 1070 ptcwakeup(tp, FREAD); 1071 } 1072 CLR(tp->t_lflag, EXTPROC); 1073 } 1074 return(0); 1075 } 1076 1077 #ifndef NO_DEV_PTM 1078 /* Allow getting the name from either the master or the slave */ 1079 if (cmd == TIOCPTSNAME) { 1080 if ((error = pty_getmp(l, &mp)) != 0) 1081 return error; 1082 return pty_fill_ptmget(l, dev, -1, -1, data, mp); 1083 } 1084 #endif 1085 1086 cdev = cdevsw_lookup(dev); 1087 if (cdev != NULL && cdev->d_open == ptcopen) 1088 switch (cmd) { 1089 #ifndef NO_DEV_PTM 1090 case TIOCGRANTPT: 1091 if ((error = pty_getmp(l, &mp)) != 0) 1092 return error; 1093 return pty_grant_slave(l, dev, mp); 1094 #endif 1095 1096 case TIOCGPGRP: 1097 /* 1098 * We avoid calling ttioctl on the controller since, 1099 * in that case, tp must be the controlling terminal. 1100 */ 1101 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1102 return 0; 1103 1104 case TIOCPKT: 1105 if (*(int *)data) { 1106 if (pti->pt_flags & PF_UCNTL) 1107 return EINVAL; 1108 pti->pt_flags |= PF_PKT; 1109 } else 1110 pti->pt_flags &= ~PF_PKT; 1111 return 0; 1112 1113 case TIOCUCNTL: 1114 if (*(int *)data) { 1115 if (pti->pt_flags & PF_PKT) 1116 return EINVAL; 1117 pti->pt_flags |= PF_UCNTL; 1118 } else 1119 pti->pt_flags &= ~PF_UCNTL; 1120 return 0; 1121 1122 case TIOCREMOTE: 1123 if (*(int *)data) 1124 pti->pt_flags |= PF_REMOTE; 1125 else 1126 pti->pt_flags &= ~PF_REMOTE; 1127 mutex_spin_enter(&tty_lock); 1128 ttyflush(tp, FREAD|FWRITE); 1129 mutex_spin_exit(&tty_lock); 1130 return 0; 1131 1132 case TIOCSETP: 1133 case TIOCSETN: 1134 case TIOCSETD: 1135 case TIOCSETA: 1136 case TIOCSETAW: 1137 case TIOCSETAF: 1138 mutex_spin_enter(&tty_lock); 1139 ndflush(&tp->t_outq, tp->t_outq.c_cc); 1140 mutex_spin_exit(&tty_lock); 1141 break; 1142 1143 case TIOCSIG: 1144 sig = (int)(long)*(void **)data; 1145 if (sig <= 0 || sig >= NSIG) 1146 return EINVAL; 1147 mutex_spin_enter(&tty_lock); 1148 if (!ISSET(tp->t_lflag, NOFLSH)) 1149 ttyflush(tp, FREAD|FWRITE); 1150 tp->t_state |= TS_SIGINFO; 1151 ttysig(tp, TTYSIG_PG1, sig); 1152 mutex_spin_exit(&tty_lock); 1153 return 0; 1154 1155 case FIONREAD: 1156 mutex_spin_enter(&tty_lock); 1157 *(int *)data = tp->t_outq.c_cc; 1158 mutex_spin_exit(&tty_lock); 1159 return 0; 1160 } 1161 1162 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 1163 if (error == EPASSTHROUGH) 1164 error = ttioctl(tp, cmd, data, flag, l); 1165 if (error == EPASSTHROUGH) { 1166 if (pti->pt_flags & PF_UCNTL && 1167 (cmd & ~0xff) == UIOCCMD(0)) { 1168 if (cmd & 0xff) { 1169 pti->pt_ucntl = (u_char)cmd; 1170 ptcwakeup(tp, FREAD); 1171 } 1172 return 0; 1173 } 1174 } 1175 /* 1176 * If external processing and packet mode send ioctl packet. 1177 */ 1178 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 1179 switch(cmd) { 1180 case TIOCSETA: 1181 case TIOCSETAW: 1182 case TIOCSETAF: 1183 case TIOCSETP: 1184 case TIOCSETN: 1185 case TIOCSETC: 1186 case TIOCSLTC: 1187 case TIOCLBIS: 1188 case TIOCLBIC: 1189 case TIOCLSET: 1190 pti->pt_send |= TIOCPKT_IOCTL; 1191 ptcwakeup(tp, FREAD); 1192 default: 1193 break; 1194 } 1195 } 1196 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 1197 && CCEQ(cc[VSTART], CTRL('q')); 1198 if (pti->pt_flags & PF_NOSTOP) { 1199 if (stop) { 1200 pti->pt_send &= ~TIOCPKT_NOSTOP; 1201 pti->pt_send |= TIOCPKT_DOSTOP; 1202 pti->pt_flags &= ~PF_NOSTOP; 1203 ptcwakeup(tp, FREAD); 1204 } 1205 } else { 1206 if (!stop) { 1207 pti->pt_send &= ~TIOCPKT_DOSTOP; 1208 pti->pt_send |= TIOCPKT_NOSTOP; 1209 pti->pt_flags |= PF_NOSTOP; 1210 ptcwakeup(tp, FREAD); 1211 } 1212 } 1213 return error; 1214 } 1215