1 /* $NetBSD: tty_pty.c,v 1.124 2010/11/16 23:58:11 dyoung 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 1.124 2010/11/16 23:58:11 dyoung 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 /* 123 * Used by arch/pmax/conf/majors.pmax, which needs a second copy as it 124 * needs to map this stuff to two pairs of majors. 125 */ 126 127 const struct cdevsw ptc_ultrix_cdevsw = { 128 ptcopen, ptcclose, ptcread, ptcwrite, ptyioctl, 129 nullstop, ptytty, ptcpoll, nommap, ptckqfilter, D_TTY 130 }; 131 132 const struct cdevsw pts_ultrix_cdevsw = { 133 ptsopen, ptsclose, ptsread, ptswrite, ptyioctl, 134 ptsstop, ptytty, ptspoll, nommap, ttykqfilter, D_TTY 135 }; 136 #endif /* defined(pmax) */ 137 138 /* 139 * Check if a pty is free to use. 140 */ 141 int 142 pty_isfree(int minor, int lock) 143 { 144 struct pt_softc *pt = pt_softc[minor]; 145 if (lock) 146 mutex_enter(&pt_softc_mutex); 147 minor = pt == NULL || pt->pt_tty == NULL || 148 pt->pt_tty->t_oproc == NULL; 149 if (lock) 150 mutex_exit(&pt_softc_mutex); 151 return minor; 152 } 153 154 /* 155 * Allocate and zero array of nelem elements. 156 */ 157 static struct pt_softc ** 158 ptyarralloc(int nelem) 159 { 160 struct pt_softc **pt; 161 nelem += 10; 162 pt = kmem_zalloc(nelem * sizeof(*pt), KM_SLEEP); 163 return pt; 164 } 165 166 static void 167 ptyarrfree(struct pt_softc **pt, int nelem) 168 { 169 170 nelem += 10; 171 kmem_free(pt, nelem * sizeof(*pt)); 172 } 173 174 /* 175 * Check if the minor is correct and ensure necessary structures 176 * are properly allocated. 177 */ 178 int 179 pty_check(int ptn) 180 { 181 struct pt_softc *pti; 182 183 if (ptn >= npty) { 184 struct pt_softc **newpt, **oldpt; 185 int newnpty; 186 int oldnpty; 187 188 /* check if the requested pty can be granted */ 189 if (ptn >= maxptys) { 190 limit_reached: 191 tablefull("pty", "increase kern.maxptys"); 192 return ENXIO; 193 } 194 195 /* Allocate a larger pty array */ 196 for (newnpty = npty; newnpty <= ptn;) 197 newnpty *= 2; 198 if (newnpty > maxptys) 199 newnpty = maxptys; 200 newpt = ptyarralloc(newnpty); 201 202 /* 203 * Now grab the pty array mutex - we need to ensure 204 * that the pty array is consistent while copying it's 205 * content to newly allocated, larger space; we also 206 * need to be safe against pty_maxptys(). 207 */ 208 mutex_enter(&pt_softc_mutex); 209 210 if (newnpty >= maxptys) { 211 /* limit cut away beneath us... */ 212 if (ptn >= maxptys) { 213 mutex_exit(&pt_softc_mutex); 214 ptyarrfree(newpt, newnpty); 215 goto limit_reached; 216 } 217 newnpty = maxptys; 218 } 219 220 /* 221 * If the pty array was not enlarged while we were waiting 222 * for mutex, copy current contents of pt_softc[] to newly 223 * allocated array and start using the new bigger array. 224 */ 225 if (newnpty > npty) { 226 memcpy(newpt, pt_softc, npty*sizeof(struct pt_softc *)); 227 oldpt = pt_softc; 228 oldnpty = npty; 229 pt_softc = newpt; 230 npty = newnpty; 231 } else { 232 /* was enlarged when waited for lock, free new space */ 233 oldpt = newpt; 234 oldnpty = newnpty; 235 } 236 237 mutex_exit(&pt_softc_mutex); 238 ptyarrfree(oldpt, oldnpty); 239 } 240 241 /* 242 * If the entry is not yet allocated, allocate one. The mutex is 243 * needed so that the state of pt_softc[] array is consistant 244 * in case it has been lengthened above. 245 */ 246 if (!pt_softc[ptn]) { 247 pti = kmem_zalloc(sizeof(*pti), KM_SLEEP); 248 249 selinit(&pti->pt_selr); 250 selinit(&pti->pt_selw); 251 pti->pt_tty = ttymalloc(); 252 253 mutex_enter(&pt_softc_mutex); 254 255 /* 256 * Check the entry again - it might have been 257 * added while we were waiting for mutex. 258 */ 259 if (pt_softc[ptn]) { 260 mutex_exit(&pt_softc_mutex); 261 ttyfree(pti->pt_tty); 262 seldestroy(&pti->pt_selr); 263 seldestroy(&pti->pt_selw); 264 kmem_free(pti, sizeof(*pti)); 265 return 0; 266 } 267 tty_attach(pti->pt_tty); 268 pt_softc[ptn] = pti; 269 270 mutex_exit(&pt_softc_mutex); 271 } 272 273 return 0; 274 } 275 276 /* 277 * Set maxpty in thread-safe way. Returns 0 in case of error, otherwise 278 * new value of maxptys. 279 */ 280 int 281 pty_maxptys(int newmax, int set) 282 { 283 if (!set) 284 return maxptys; 285 286 /* 287 * We have to grab the pt_softc lock, so that we would pick correct 288 * value of npty (might be modified in pty_check()). 289 */ 290 mutex_enter(&pt_softc_mutex); 291 292 /* 293 * The value cannot be set to value lower than the highest pty 294 * number ever allocated. 295 */ 296 if (newmax >= npty) 297 maxptys = newmax; 298 else 299 newmax = 0; 300 301 mutex_exit(&pt_softc_mutex); 302 303 return newmax; 304 } 305 306 /* 307 * Establish n (or default if n is 1) ptys in the system. 308 */ 309 void 310 ptyattach(int n) 311 { 312 313 mutex_init(&pt_softc_mutex, MUTEX_DEFAULT, IPL_NONE); 314 315 /* maybe should allow 0 => none? */ 316 if (n <= 1) 317 n = DEFAULT_NPTYS; 318 pt_softc = ptyarralloc(n); 319 npty = n; 320 #ifndef NO_DEV_PTM 321 ptmattach(1); 322 #endif 323 } 324 325 /*ARGSUSED*/ 326 int 327 ptsopen(dev_t dev, int flag, int devtype, struct lwp *l) 328 { 329 struct pt_softc *pti; 330 struct tty *tp; 331 int error; 332 int ptn = minor(dev); 333 334 if ((error = pty_check(ptn)) != 0) 335 return error; 336 337 mutex_spin_enter(&tty_lock); 338 pti = pt_softc[ptn]; 339 tp = pti->pt_tty; 340 if (!ISSET(tp->t_state, TS_ISOPEN)) { 341 ttychars(tp); /* Set up default chars */ 342 tp->t_iflag = TTYDEF_IFLAG; 343 tp->t_oflag = TTYDEF_OFLAG; 344 tp->t_lflag = TTYDEF_LFLAG; 345 tp->t_cflag = TTYDEF_CFLAG; 346 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 347 ttsetwater(tp); /* would be done in xxparam() */ 348 } else if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, 349 tp) != 0) { 350 mutex_spin_exit(&tty_lock); 351 return EBUSY; 352 } 353 if (tp->t_oproc) /* Ctrlr still around. */ 354 SET(tp->t_state, TS_CARR_ON); 355 if (!ISSET(flag, O_NONBLOCK)) { 356 while (!ISSET(tp->t_state, TS_CARR_ON)) { 357 tp->t_wopen++; 358 error = ttysleep(tp, &tp->t_rawcv, true, 0); 359 tp->t_wopen--; 360 if (error != 0) { 361 mutex_spin_exit(&tty_lock); 362 return error; 363 } 364 } 365 } 366 mutex_spin_exit(&tty_lock); 367 error = (*tp->t_linesw->l_open)(dev, tp); 368 ptcwakeup(tp, FREAD|FWRITE); 369 return error; 370 } 371 372 int 373 ptsclose(dev_t dev, int flag, int mode, struct lwp *l) 374 { 375 struct pt_softc *pti = pt_softc[minor(dev)]; 376 struct tty *tp = pti->pt_tty; 377 int error; 378 379 error = (*tp->t_linesw->l_close)(tp, flag); 380 error |= ttyclose(tp); 381 ptcwakeup(tp, FREAD|FWRITE); 382 return error; 383 } 384 385 int 386 ptsread(dev_t dev, struct uio *uio, int flag) 387 { 388 struct proc *p = curproc; 389 struct pt_softc *pti = pt_softc[minor(dev)]; 390 struct tty *tp = pti->pt_tty; 391 int error = 0; 392 int cc, c; 393 394 again: 395 if (pti->pt_flags & PF_REMOTE) { 396 mutex_spin_enter(&tty_lock); 397 while (isbackground(p, tp)) { /* XXXSMP */ 398 if (sigismasked(curlwp, SIGTTIN) || 399 p->p_pgrp->pg_jobc == 0 || 400 p->p_lflag & PL_PPWAIT) { 401 mutex_spin_exit(&tty_lock); 402 return EIO; 403 } 404 ttysig(tp, TTYSIG_PG1, SIGTTIN); 405 error = ttysleep(tp, &lbolt, true, 0); 406 if (error != 0) { 407 mutex_spin_exit(&tty_lock); 408 return error; 409 } 410 } 411 if (tp->t_canq.c_cc == 0) { 412 if (flag & IO_NDELAY) { 413 mutex_spin_exit(&tty_lock); 414 return EWOULDBLOCK; 415 } 416 error = ttysleep(tp, &tp->t_cancv, true, 0); 417 mutex_spin_exit(&tty_lock); 418 if (error != 0) 419 return error; 420 goto again; 421 } 422 while(error == 0 && tp->t_canq.c_cc > 1 && uio->uio_resid > 0) { 423 c = getc(&tp->t_canq); 424 mutex_spin_exit(&tty_lock); 425 error = ureadc(c, uio); 426 mutex_spin_enter(&tty_lock); 427 /* Re-check terminal state here? */ 428 } 429 if (tp->t_canq.c_cc == 1) 430 (void) getc(&tp->t_canq); 431 cc = tp->t_canq.c_cc; 432 mutex_spin_exit(&tty_lock); 433 if (cc) 434 return error; 435 } else if (tp->t_oproc) 436 error = (*tp->t_linesw->l_read)(tp, uio, flag); 437 ptcwakeup(tp, FWRITE); 438 return error; 439 } 440 441 /* 442 * Write to pseudo-tty. 443 * Wakeups of controlling tty will happen 444 * indirectly, when tty driver calls ptsstart. 445 */ 446 int 447 ptswrite(dev_t dev, struct uio *uio, int flag) 448 { 449 struct pt_softc *pti = pt_softc[minor(dev)]; 450 struct tty *tp = pti->pt_tty; 451 452 if (tp->t_oproc == NULL) 453 return EIO; 454 return (*tp->t_linesw->l_write)(tp, uio, flag); 455 } 456 457 /* 458 * Poll pseudo-tty. 459 */ 460 int 461 ptspoll(dev_t dev, int events, struct lwp *l) 462 { 463 struct pt_softc *pti = pt_softc[minor(dev)]; 464 struct tty *tp = pti->pt_tty; 465 466 if (tp->t_oproc == NULL) 467 return POLLHUP; 468 469 return (*tp->t_linesw->l_poll)(tp, events, l); 470 } 471 472 /* 473 * Start output on pseudo-tty. 474 * Wake up process polling or sleeping for input from controlling tty. 475 */ 476 void 477 ptsstart(struct tty *tp) 478 { 479 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 480 481 KASSERT(mutex_owned(&tty_lock)); 482 483 if (ISSET(tp->t_state, TS_TTSTOP)) 484 return; 485 if (pti->pt_flags & PF_STOPPED) { 486 pti->pt_flags &= ~PF_STOPPED; 487 pti->pt_send = TIOCPKT_START; 488 } 489 490 selnotify(&pti->pt_selr, 0, NOTE_SUBMIT); 491 cv_broadcast(&tp->t_outcvf); 492 } 493 494 /* 495 * Stop output. 496 */ 497 void 498 ptsstop(struct tty *tp, int flush) 499 { 500 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 501 502 KASSERT(mutex_owned(&tty_lock)); 503 504 /* note: FLUSHREAD and FLUSHWRITE already ok */ 505 if (flush == 0) { 506 flush = TIOCPKT_STOP; 507 pti->pt_flags |= PF_STOPPED; 508 } else 509 pti->pt_flags &= ~PF_STOPPED; 510 pti->pt_send |= flush; 511 512 /* change of perspective */ 513 if (flush & FREAD) { 514 selnotify(&pti->pt_selw, 0, NOTE_SUBMIT); 515 cv_broadcast(&tp->t_rawcvf); 516 } 517 if (flush & FWRITE) { 518 selnotify(&pti->pt_selr, 0, NOTE_SUBMIT); 519 cv_broadcast(&tp->t_outcvf); 520 } 521 } 522 523 void 524 ptcwakeup(struct tty *tp, int flag) 525 { 526 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 527 528 mutex_spin_enter(&tty_lock); 529 if (flag & FREAD) { 530 selnotify(&pti->pt_selr, 0, NOTE_SUBMIT); 531 cv_broadcast(&tp->t_outcvf); 532 } 533 if (flag & FWRITE) { 534 selnotify(&pti->pt_selw, 0, NOTE_SUBMIT); 535 cv_broadcast(&tp->t_rawcvf); 536 } 537 mutex_spin_exit(&tty_lock); 538 } 539 540 /*ARGSUSED*/ 541 int 542 ptcopen(dev_t dev, int flag, int devtype, struct lwp *l) 543 { 544 struct pt_softc *pti; 545 struct tty *tp; 546 int error; 547 int ptn = minor(dev); 548 549 if ((error = pty_check(ptn)) != 0) 550 return error; 551 552 pti = pt_softc[ptn]; 553 tp = pti->pt_tty; 554 555 mutex_spin_enter(&tty_lock); 556 if (tp->t_oproc) { 557 mutex_spin_exit(&tty_lock); 558 return EIO; 559 } 560 tp->t_oproc = ptsstart; 561 mutex_spin_exit(&tty_lock); 562 (void)(*tp->t_linesw->l_modem)(tp, 1); 563 CLR(tp->t_lflag, EXTPROC); 564 pti->pt_flags = 0; 565 pti->pt_send = 0; 566 pti->pt_ucntl = 0; 567 return 0; 568 } 569 570 /*ARGSUSED*/ 571 int 572 ptcclose(dev_t dev, int flag, int devtype, struct lwp *l) 573 { 574 struct pt_softc *pti = pt_softc[minor(dev)]; 575 struct tty *tp = pti->pt_tty; 576 577 (void)(*tp->t_linesw->l_modem)(tp, 0); 578 mutex_spin_enter(&tty_lock); 579 CLR(tp->t_state, TS_CARR_ON); 580 tp->t_oproc = NULL; /* mark closed */ 581 mutex_spin_exit(&tty_lock); 582 return 0; 583 } 584 585 int 586 ptcread(dev_t dev, struct uio *uio, int flag) 587 { 588 struct pt_softc *pti = pt_softc[minor(dev)]; 589 struct tty *tp = pti->pt_tty; 590 u_char bf[BUFSIZ]; 591 int error = 0, cc; 592 int c; 593 594 if (uio->uio_resid <= 0) 595 return EINVAL; 596 597 /* 598 * We want to block until the slave 599 * is open, and there's something to read; 600 * but if we lost the slave or we're NBIO, 601 * then return the appropriate error instead. 602 */ 603 mutex_spin_enter(&tty_lock); 604 for (;;) { 605 if (ISSET(tp->t_state, TS_ISOPEN)) { 606 if (pti->pt_flags & PF_PKT && (c = pti->pt_send)) { 607 pti->pt_send = 0; 608 mutex_spin_exit(&tty_lock); 609 error = ureadc(c, uio); 610 if (error != 0) 611 return error; 612 /* 613 * Since we don't have the tty locked, there's 614 * a risk of messing up `t_termios'. This is 615 * relevant only if the tty got closed and then 616 * opened again while we were out uiomoving. 617 */ 618 if (c & TIOCPKT_IOCTL) { 619 cc = min(uio->uio_resid, 620 sizeof(tp->t_termios)); 621 uiomove((void *) &tp->t_termios, 622 cc, uio); 623 } 624 return 0; 625 } 626 if (pti->pt_flags & PF_UCNTL && (c = pti->pt_ucntl)) { 627 pti->pt_ucntl = 0; 628 mutex_spin_exit(&tty_lock); 629 error = ureadc(c, uio); 630 if (error != 0) 631 return error; 632 return 0; 633 } 634 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 635 break; 636 } 637 if (!ISSET(tp->t_state, TS_CARR_ON)) { 638 error = 0; /* EOF */ 639 goto out; 640 } 641 if (flag & IO_NDELAY) { 642 error = EWOULDBLOCK; 643 goto out; 644 } 645 error = cv_wait_sig(&tp->t_outcvf, &tty_lock); 646 if (error != 0) 647 goto out; 648 } 649 650 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) { 651 mutex_spin_exit(&tty_lock); 652 error = ureadc(0, uio); 653 mutex_spin_enter(&tty_lock); 654 if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) 655 error = EIO; 656 } 657 while (uio->uio_resid > 0 && error == 0) { 658 cc = q_to_b(&tp->t_outq, bf, min(uio->uio_resid, BUFSIZ)); 659 if (cc <= 0) 660 break; 661 mutex_spin_exit(&tty_lock); 662 error = uiomove(bf, cc, uio); 663 mutex_spin_enter(&tty_lock); 664 if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) 665 error = EIO; 666 } 667 ttypull(tp); 668 out: 669 mutex_spin_exit(&tty_lock); 670 return error; 671 } 672 673 674 int 675 ptcwrite(dev_t dev, struct uio *uio, int flag) 676 { 677 struct pt_softc *pti = pt_softc[minor(dev)]; 678 struct tty *tp = pti->pt_tty; 679 u_char *cp = NULL; 680 int cc = 0; 681 u_char locbuf[BUFSIZ]; 682 int cnt = 0; 683 int error = 0; 684 685 again: 686 mutex_spin_enter(&tty_lock); 687 if (!ISSET(tp->t_state, TS_ISOPEN)) 688 goto block; 689 if (pti->pt_flags & PF_REMOTE) { 690 if (tp->t_canq.c_cc) 691 goto block; 692 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 693 if (cc == 0) { 694 cc = min(uio->uio_resid, BUFSIZ); 695 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 696 cp = locbuf; 697 mutex_spin_exit(&tty_lock); 698 error = uiomove((void *)cp, cc, uio); 699 if (error != 0) 700 return error; 701 mutex_spin_enter(&tty_lock); 702 /* check again for safety */ 703 if (!ISSET(tp->t_state, TS_ISOPEN)) { 704 /* 705 * adjust for data copied in but not 706 * written 707 */ 708 uio->uio_resid += cc; 709 error = EIO; 710 goto out; 711 } 712 } 713 if (cc) 714 (void) b_to_q(cp, cc, &tp->t_canq); 715 cc = 0; 716 } 717 (void) putc(0, &tp->t_canq); 718 ttwakeup(tp); 719 cv_broadcast(&tp->t_cancv); 720 error = 0; 721 goto out; 722 } 723 while (uio->uio_resid > 0) { 724 if (cc == 0) { 725 cc = min(uio->uio_resid, BUFSIZ); 726 cp = locbuf; 727 mutex_spin_exit(&tty_lock); 728 error = uiomove((void *)cp, cc, uio); 729 if (error != 0) 730 return error; 731 mutex_spin_enter(&tty_lock); 732 /* check again for safety */ 733 if (!ISSET(tp->t_state, TS_ISOPEN)) { 734 /* adjust for data copied in but not written */ 735 uio->uio_resid += cc; 736 error = EIO; 737 goto out; 738 } 739 } 740 while (cc > 0) { 741 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 742 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_lflag, ICANON))) { 743 cv_broadcast(&tp->t_rawcv); 744 goto block; 745 } 746 /* XXX - should change l_rint to be called with lock 747 * see also tty.c:ttyinput_wlock() 748 */ 749 mutex_spin_exit(&tty_lock); 750 (*tp->t_linesw->l_rint)(*cp++, tp); 751 mutex_spin_enter(&tty_lock); 752 cnt++; 753 cc--; 754 } 755 cc = 0; 756 } 757 error = 0; 758 goto out; 759 760 block: 761 /* 762 * Come here to wait for slave to open, for space 763 * in outq, or space in rawq. 764 */ 765 if (!ISSET(tp->t_state, TS_CARR_ON)) { 766 /* adjust for data copied in but not written */ 767 uio->uio_resid += cc; 768 error = EIO; 769 goto out; 770 } 771 if (flag & IO_NDELAY) { 772 /* adjust for data copied in but not written */ 773 uio->uio_resid += cc; 774 error = cnt == 0 ? EWOULDBLOCK : 0; 775 goto out; 776 } 777 error = cv_wait_sig(&tp->t_rawcvf, &tty_lock); 778 mutex_spin_exit(&tty_lock); 779 if (error != 0) { 780 /* adjust for data copied in but not written */ 781 uio->uio_resid += cc; 782 return error; 783 } 784 goto again; 785 786 out: 787 mutex_spin_exit(&tty_lock); 788 return error; 789 } 790 791 int 792 ptcpoll(dev_t dev, int events, struct lwp *l) 793 { 794 struct pt_softc *pti = pt_softc[minor(dev)]; 795 struct tty *tp = pti->pt_tty; 796 int revents = 0; 797 798 mutex_spin_enter(&tty_lock); 799 800 if (events & (POLLIN | POLLRDNORM)) 801 if (ISSET(tp->t_state, TS_ISOPEN) && 802 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 803 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 804 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 805 revents |= events & (POLLIN | POLLRDNORM); 806 807 if (events & (POLLOUT | POLLWRNORM)) 808 if (ISSET(tp->t_state, TS_ISOPEN) && 809 ((pti->pt_flags & PF_REMOTE) ? 810 (tp->t_canq.c_cc == 0) : 811 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 812 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))) 813 revents |= events & (POLLOUT | POLLWRNORM); 814 815 if (events & POLLHUP) 816 if (!ISSET(tp->t_state, TS_CARR_ON)) 817 revents |= POLLHUP; 818 819 if (revents == 0) { 820 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 821 selrecord(l, &pti->pt_selr); 822 823 if (events & (POLLOUT | POLLWRNORM)) 824 selrecord(l, &pti->pt_selw); 825 } 826 827 mutex_spin_exit(&tty_lock); 828 829 return revents; 830 } 831 832 static void 833 filt_ptcrdetach(struct knote *kn) 834 { 835 struct pt_softc *pti; 836 struct tty *tp; 837 838 pti = kn->kn_hook; 839 tp = pti->pt_tty; 840 841 mutex_spin_enter(&tty_lock); 842 SLIST_REMOVE(&pti->pt_selr.sel_klist, kn, knote, kn_selnext); 843 mutex_spin_exit(&tty_lock); 844 } 845 846 static int 847 filt_ptcread(struct knote *kn, long hint) 848 { 849 struct pt_softc *pti; 850 struct tty *tp; 851 int canread; 852 853 pti = kn->kn_hook; 854 tp = pti->pt_tty; 855 856 if ((hint & NOTE_SUBMIT) == 0) { 857 mutex_spin_enter(&tty_lock); 858 } 859 860 canread = (ISSET(tp->t_state, TS_ISOPEN) && 861 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 862 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 863 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))); 864 865 if (canread) { 866 /* 867 * c_cc is number of characters after output post-processing; 868 * the amount of data actually read(2) depends on 869 * setting of input flags for the terminal. 870 */ 871 kn->kn_data = tp->t_outq.c_cc; 872 if (((pti->pt_flags & PF_PKT) && pti->pt_send) || 873 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)) 874 kn->kn_data++; 875 } 876 877 if ((hint & NOTE_SUBMIT) == 0) { 878 mutex_spin_exit(&tty_lock); 879 } 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 if ((hint & NOTE_SUBMIT) == 0) { 910 mutex_spin_enter(&tty_lock); 911 } 912 913 canwrite = (ISSET(tp->t_state, TS_ISOPEN) && 914 ((pti->pt_flags & PF_REMOTE) ? 915 (tp->t_canq.c_cc == 0) : 916 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 917 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))); 918 919 if (canwrite) { 920 if (pti->pt_flags & PF_REMOTE) 921 nwrite = tp->t_canq.c_cn; 922 else { 923 /* this is guaranteed to be > 0 due to above check */ 924 nwrite = tp->t_canq.c_cn 925 - (tp->t_rawq.c_cc + tp->t_canq.c_cc); 926 } 927 kn->kn_data = nwrite; 928 } 929 930 if ((hint & NOTE_SUBMIT) == 0) { 931 mutex_spin_exit(&tty_lock); 932 } 933 934 return canwrite; 935 } 936 937 static const struct filterops ptcread_filtops = 938 { 1, NULL, filt_ptcrdetach, filt_ptcread }; 939 static const struct filterops ptcwrite_filtops = 940 { 1, NULL, filt_ptcwdetach, filt_ptcwrite }; 941 942 int 943 ptckqfilter(dev_t dev, struct knote *kn) 944 { 945 struct pt_softc *pti = pt_softc[minor(dev)]; 946 struct klist *klist; 947 948 switch (kn->kn_filter) { 949 case EVFILT_READ: 950 klist = &pti->pt_selr.sel_klist; 951 kn->kn_fop = &ptcread_filtops; 952 break; 953 case EVFILT_WRITE: 954 klist = &pti->pt_selw.sel_klist; 955 kn->kn_fop = &ptcwrite_filtops; 956 break; 957 default: 958 return EINVAL; 959 } 960 961 kn->kn_hook = pti; 962 963 mutex_spin_enter(&tty_lock); 964 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 965 mutex_spin_exit(&tty_lock); 966 967 return 0; 968 } 969 970 struct tty * 971 ptytty(dev_t dev) 972 { 973 struct pt_softc *pti = pt_softc[minor(dev)]; 974 struct tty *tp = pti->pt_tty; 975 976 return tp; 977 } 978 979 /*ARGSUSED*/ 980 int 981 ptyioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 982 { 983 struct pt_softc *pti = pt_softc[minor(dev)]; 984 struct tty *tp = pti->pt_tty; 985 const struct cdevsw *cdev; 986 u_char *cc = tp->t_cc; 987 int stop, error, sig; 988 989 /* 990 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 991 * ttywflush(tp) will hang if there are characters in the outq. 992 */ 993 if (cmd == TIOCEXT) { 994 /* 995 * When the EXTPROC bit is being toggled, we need 996 * to send an TIOCPKT_IOCTL if the packet driver 997 * is turned on. 998 */ 999 if (*(int *)data) { 1000 if (pti->pt_flags & PF_PKT) { 1001 pti->pt_send |= TIOCPKT_IOCTL; 1002 ptcwakeup(tp, FREAD); 1003 } 1004 SET(tp->t_lflag, EXTPROC); 1005 } else { 1006 if (ISSET(tp->t_lflag, EXTPROC) && 1007 (pti->pt_flags & PF_PKT)) { 1008 pti->pt_send |= TIOCPKT_IOCTL; 1009 ptcwakeup(tp, FREAD); 1010 } 1011 CLR(tp->t_lflag, EXTPROC); 1012 } 1013 return(0); 1014 } 1015 1016 #ifndef NO_DEV_PTM 1017 /* Allow getting the name from either the master or the slave */ 1018 if (cmd == TIOCPTSNAME) 1019 return pty_fill_ptmget(l, dev, -1, -1, data); 1020 #endif 1021 1022 cdev = cdevsw_lookup(dev); 1023 if (cdev != NULL && cdev->d_open == ptcopen) 1024 switch (cmd) { 1025 #ifndef NO_DEV_PTM 1026 case TIOCGRANTPT: 1027 return pty_grant_slave(l, dev); 1028 #endif 1029 1030 case TIOCGPGRP: 1031 /* 1032 * We avoid calling ttioctl on the controller since, 1033 * in that case, tp must be the controlling terminal. 1034 */ 1035 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1036 return 0; 1037 1038 case TIOCPKT: 1039 if (*(int *)data) { 1040 if (pti->pt_flags & PF_UCNTL) 1041 return EINVAL; 1042 pti->pt_flags |= PF_PKT; 1043 } else 1044 pti->pt_flags &= ~PF_PKT; 1045 return 0; 1046 1047 case TIOCUCNTL: 1048 if (*(int *)data) { 1049 if (pti->pt_flags & PF_PKT) 1050 return EINVAL; 1051 pti->pt_flags |= PF_UCNTL; 1052 } else 1053 pti->pt_flags &= ~PF_UCNTL; 1054 return 0; 1055 1056 case TIOCREMOTE: 1057 if (*(int *)data) 1058 pti->pt_flags |= PF_REMOTE; 1059 else 1060 pti->pt_flags &= ~PF_REMOTE; 1061 mutex_spin_enter(&tty_lock); 1062 ttyflush(tp, FREAD|FWRITE); 1063 mutex_spin_exit(&tty_lock); 1064 return 0; 1065 1066 case TIOCSETP: 1067 case TIOCSETN: 1068 case TIOCSETD: 1069 case TIOCSETA: 1070 case TIOCSETAW: 1071 case TIOCSETAF: 1072 mutex_spin_enter(&tty_lock); 1073 ndflush(&tp->t_outq, tp->t_outq.c_cc); 1074 mutex_spin_exit(&tty_lock); 1075 break; 1076 1077 case TIOCSIG: 1078 sig = (int)(long)*(void **)data; 1079 if (sig <= 0 || sig >= NSIG) 1080 return EINVAL; 1081 mutex_spin_enter(&tty_lock); 1082 if (!ISSET(tp->t_lflag, NOFLSH)) 1083 ttyflush(tp, FREAD|FWRITE); 1084 tp->t_state |= TS_SIGINFO; 1085 ttysig(tp, TTYSIG_PG1, sig); 1086 mutex_spin_exit(&tty_lock); 1087 return 0; 1088 1089 case FIONREAD: 1090 mutex_spin_enter(&tty_lock); 1091 *(int *)data = tp->t_outq.c_cc; 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 case TIOCSETP: 1118 case TIOCSETN: 1119 case TIOCSETC: 1120 case TIOCSLTC: 1121 case TIOCLBIS: 1122 case TIOCLBIC: 1123 case TIOCLSET: 1124 pti->pt_send |= TIOCPKT_IOCTL; 1125 ptcwakeup(tp, FREAD); 1126 default: 1127 break; 1128 } 1129 } 1130 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 1131 && CCEQ(cc[VSTART], CTRL('q')); 1132 if (pti->pt_flags & PF_NOSTOP) { 1133 if (stop) { 1134 pti->pt_send &= ~TIOCPKT_NOSTOP; 1135 pti->pt_send |= TIOCPKT_DOSTOP; 1136 pti->pt_flags &= ~PF_NOSTOP; 1137 ptcwakeup(tp, FREAD); 1138 } 1139 } else { 1140 if (!stop) { 1141 pti->pt_send &= ~TIOCPKT_DOSTOP; 1142 pti->pt_send |= TIOCPKT_NOSTOP; 1143 pti->pt_flags |= PF_NOSTOP; 1144 ptcwakeup(tp, FREAD); 1145 } 1146 } 1147 return error; 1148 } 1149