1 /* $NetBSD: tty_pty.c,v 1.118 2009/10/11 08:08:32 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 1.118 2009/10/11 08:08:32 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 /* 590 * We want to block until the slave 591 * is open, and there's something to read; 592 * but if we lost the slave or we're NBIO, 593 * then return the appropriate error instead. 594 */ 595 mutex_spin_enter(&tty_lock); 596 for (;;) { 597 if (ISSET(tp->t_state, TS_ISOPEN)) { 598 if (pti->pt_flags & PF_PKT && (c = pti->pt_send)) { 599 pti->pt_send = 0; 600 mutex_spin_exit(&tty_lock); 601 error = ureadc(c, uio); 602 if (error) 603 return (error); 604 /* 605 * Since we don't have the tty locked, there's 606 * a risk of messing up `t_termios'. This is 607 * relevant only if the tty got closed and then 608 * opened again while we were out uiomoving. 609 */ 610 if (pti->pt_send & TIOCPKT_IOCTL) { 611 cc = min(uio->uio_resid, 612 sizeof(tp->t_termios)); 613 uiomove((void *) &tp->t_termios, 614 cc, uio); 615 } 616 return (0); 617 } 618 if (pti->pt_flags & PF_UCNTL && (c = pti->pt_ucntl)) { 619 pti->pt_ucntl = 0; 620 mutex_spin_exit(&tty_lock); 621 error = ureadc(c, uio); 622 if (error) 623 return (error); 624 return (0); 625 } 626 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 627 break; 628 } 629 if (!ISSET(tp->t_state, TS_CARR_ON)) { 630 error = 0; /* EOF */ 631 goto out; 632 } 633 if (flag & IO_NDELAY) { 634 error = EWOULDBLOCK; 635 goto out; 636 } 637 error = cv_wait_sig(&tp->t_outcvf, &tty_lock); 638 if (error) 639 goto out; 640 } 641 642 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) { 643 mutex_spin_exit(&tty_lock); 644 error = ureadc(0, uio); 645 mutex_spin_enter(&tty_lock); 646 if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) 647 error = EIO; 648 } 649 while (uio->uio_resid > 0 && error == 0) { 650 cc = q_to_b(&tp->t_outq, bf, min(uio->uio_resid, BUFSIZ)); 651 if (cc <= 0) 652 break; 653 mutex_spin_exit(&tty_lock); 654 error = uiomove(bf, cc, uio); 655 mutex_spin_enter(&tty_lock); 656 if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) 657 error = EIO; 658 } 659 ttypull(tp); 660 out: 661 mutex_spin_exit(&tty_lock); 662 return (error); 663 } 664 665 666 int 667 ptcwrite(dev_t dev, struct uio *uio, int flag) 668 { 669 struct pt_softc *pti = pt_softc[minor(dev)]; 670 struct tty *tp = pti->pt_tty; 671 u_char *cp = NULL; 672 int cc = 0; 673 u_char locbuf[BUFSIZ]; 674 int cnt = 0; 675 int error = 0; 676 677 again: 678 mutex_spin_enter(&tty_lock); 679 if (!ISSET(tp->t_state, TS_ISOPEN)) 680 goto block; 681 if (pti->pt_flags & PF_REMOTE) { 682 if (tp->t_canq.c_cc) 683 goto block; 684 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 685 if (cc == 0) { 686 cc = min(uio->uio_resid, BUFSIZ); 687 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 688 cp = locbuf; 689 mutex_spin_exit(&tty_lock); 690 error = uiomove((void *)cp, cc, uio); 691 if (error) 692 return (error); 693 mutex_spin_enter(&tty_lock); 694 /* check again for safety */ 695 if (!ISSET(tp->t_state, TS_ISOPEN)) { 696 /* 697 * adjust for data copied in but not 698 * written 699 */ 700 uio->uio_resid += cc; 701 error = EIO; 702 goto out; 703 } 704 } 705 if (cc) 706 (void) b_to_q(cp, cc, &tp->t_canq); 707 cc = 0; 708 } 709 (void) putc(0, &tp->t_canq); 710 ttwakeup(tp); 711 cv_broadcast(&tp->t_cancv); 712 error = 0; 713 goto out; 714 } 715 while (uio->uio_resid > 0) { 716 if (cc == 0) { 717 cc = min(uio->uio_resid, BUFSIZ); 718 cp = locbuf; 719 mutex_spin_exit(&tty_lock); 720 error = uiomove((void *)cp, cc, uio); 721 if (error) 722 return (error); 723 mutex_spin_enter(&tty_lock); 724 /* check again for safety */ 725 if (!ISSET(tp->t_state, TS_ISOPEN)) { 726 /* adjust for data copied in but not written */ 727 uio->uio_resid += cc; 728 error = EIO; 729 goto out; 730 } 731 } 732 while (cc > 0) { 733 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 734 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_lflag, ICANON))) { 735 cv_broadcast(&tp->t_rawcv); 736 goto block; 737 } 738 /* XXX - should change l_rint to be called with lock 739 * see also tty.c:ttyinput_wlock() 740 */ 741 mutex_spin_exit(&tty_lock); 742 (*tp->t_linesw->l_rint)(*cp++, tp); 743 mutex_spin_enter(&tty_lock); 744 cnt++; 745 cc--; 746 } 747 cc = 0; 748 } 749 error = 0; 750 goto out; 751 752 block: 753 /* 754 * Come here to wait for slave to open, for space 755 * in outq, or space in rawq. 756 */ 757 if (!ISSET(tp->t_state, TS_CARR_ON)) { 758 /* adjust for data copied in but not written */ 759 uio->uio_resid += cc; 760 error = EIO; 761 goto out; 762 } 763 if (flag & IO_NDELAY) { 764 /* adjust for data copied in but not written */ 765 uio->uio_resid += cc; 766 error = cnt == 0 ? EWOULDBLOCK : 0; 767 goto out; 768 } 769 error = cv_wait_sig(&tp->t_rawcvf, &tty_lock); 770 mutex_spin_exit(&tty_lock); 771 if (error) { 772 /* adjust for data copied in but not written */ 773 uio->uio_resid += cc; 774 return (error); 775 } 776 goto again; 777 778 out: 779 mutex_spin_exit(&tty_lock); 780 return (error); 781 } 782 783 int 784 ptcpoll(dev_t dev, int events, struct lwp *l) 785 { 786 struct pt_softc *pti = pt_softc[minor(dev)]; 787 struct tty *tp = pti->pt_tty; 788 int revents = 0; 789 790 mutex_spin_enter(&tty_lock); 791 792 if (events & (POLLIN | POLLRDNORM)) 793 if (ISSET(tp->t_state, TS_ISOPEN) && 794 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 795 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 796 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 797 revents |= events & (POLLIN | POLLRDNORM); 798 799 if (events & (POLLOUT | POLLWRNORM)) 800 if (ISSET(tp->t_state, TS_ISOPEN) && 801 ((pti->pt_flags & PF_REMOTE) ? 802 (tp->t_canq.c_cc == 0) : 803 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 804 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))) 805 revents |= events & (POLLOUT | POLLWRNORM); 806 807 if (events & POLLHUP) 808 if (!ISSET(tp->t_state, TS_CARR_ON)) 809 revents |= POLLHUP; 810 811 if (revents == 0) { 812 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 813 selrecord(l, &pti->pt_selr); 814 815 if (events & (POLLOUT | POLLWRNORM)) 816 selrecord(l, &pti->pt_selw); 817 } 818 819 mutex_spin_exit(&tty_lock); 820 821 return (revents); 822 } 823 824 static void 825 filt_ptcrdetach(struct knote *kn) 826 { 827 struct pt_softc *pti; 828 struct tty *tp; 829 830 pti = kn->kn_hook; 831 tp = pti->pt_tty; 832 833 mutex_spin_enter(&tty_lock); 834 SLIST_REMOVE(&pti->pt_selr.sel_klist, kn, knote, kn_selnext); 835 mutex_spin_exit(&tty_lock); 836 } 837 838 static int 839 filt_ptcread(struct knote *kn, long hint) 840 { 841 struct pt_softc *pti; 842 struct tty *tp; 843 int canread; 844 845 pti = kn->kn_hook; 846 tp = pti->pt_tty; 847 848 if ((hint & NOTE_SUBMIT) == 0) { 849 mutex_spin_enter(&tty_lock); 850 } 851 852 canread = (ISSET(tp->t_state, TS_ISOPEN) && 853 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 854 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 855 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))); 856 857 if (canread) { 858 /* 859 * c_cc is number of characters after output post-processing; 860 * the amount of data actually read(2) depends on 861 * setting of input flags for the terminal. 862 */ 863 kn->kn_data = tp->t_outq.c_cc; 864 if (((pti->pt_flags & PF_PKT) && pti->pt_send) || 865 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)) 866 kn->kn_data++; 867 } 868 869 if ((hint & NOTE_SUBMIT) == 0) { 870 mutex_spin_exit(&tty_lock); 871 } 872 873 return (canread); 874 } 875 876 static void 877 filt_ptcwdetach(struct knote *kn) 878 { 879 struct pt_softc *pti; 880 struct tty *tp; 881 882 pti = kn->kn_hook; 883 tp = pti->pt_tty; 884 885 mutex_spin_enter(&tty_lock); 886 SLIST_REMOVE(&pti->pt_selw.sel_klist, kn, knote, kn_selnext); 887 mutex_spin_exit(&tty_lock); 888 } 889 890 static int 891 filt_ptcwrite(struct knote *kn, long hint) 892 { 893 struct pt_softc *pti; 894 struct tty *tp; 895 int canwrite; 896 int nwrite; 897 898 pti = kn->kn_hook; 899 tp = pti->pt_tty; 900 901 if ((hint & NOTE_SUBMIT) == 0) { 902 mutex_spin_enter(&tty_lock); 903 } 904 905 canwrite = (ISSET(tp->t_state, TS_ISOPEN) && 906 ((pti->pt_flags & PF_REMOTE) ? 907 (tp->t_canq.c_cc == 0) : 908 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 909 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))); 910 911 if (canwrite) { 912 if (pti->pt_flags & PF_REMOTE) 913 nwrite = tp->t_canq.c_cn; 914 else { 915 /* this is guaranteed to be > 0 due to above check */ 916 nwrite = tp->t_canq.c_cn 917 - (tp->t_rawq.c_cc + tp->t_canq.c_cc); 918 } 919 kn->kn_data = nwrite; 920 } 921 922 if ((hint & NOTE_SUBMIT) == 0) { 923 mutex_spin_exit(&tty_lock); 924 } 925 926 return (canwrite); 927 } 928 929 static const struct filterops ptcread_filtops = 930 { 1, NULL, filt_ptcrdetach, filt_ptcread }; 931 static const struct filterops ptcwrite_filtops = 932 { 1, NULL, filt_ptcwdetach, filt_ptcwrite }; 933 934 int 935 ptckqfilter(dev_t dev, struct knote *kn) 936 { 937 struct pt_softc *pti = pt_softc[minor(dev)]; 938 struct klist *klist; 939 940 switch (kn->kn_filter) { 941 case EVFILT_READ: 942 klist = &pti->pt_selr.sel_klist; 943 kn->kn_fop = &ptcread_filtops; 944 break; 945 case EVFILT_WRITE: 946 klist = &pti->pt_selw.sel_klist; 947 kn->kn_fop = &ptcwrite_filtops; 948 break; 949 default: 950 return (EINVAL); 951 } 952 953 kn->kn_hook = pti; 954 955 mutex_spin_enter(&tty_lock); 956 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 957 mutex_spin_exit(&tty_lock); 958 959 return (0); 960 } 961 962 struct tty * 963 ptytty(dev_t dev) 964 { 965 struct pt_softc *pti = pt_softc[minor(dev)]; 966 struct tty *tp = pti->pt_tty; 967 968 return (tp); 969 } 970 971 /*ARGSUSED*/ 972 int 973 ptyioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 974 { 975 struct pt_softc *pti = pt_softc[minor(dev)]; 976 struct tty *tp = pti->pt_tty; 977 const struct cdevsw *cdev; 978 u_char *cc = tp->t_cc; 979 int stop, error, sig; 980 981 /* 982 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 983 * ttywflush(tp) will hang if there are characters in the outq. 984 */ 985 if (cmd == TIOCEXT) { 986 /* 987 * When the EXTPROC bit is being toggled, we need 988 * to send an TIOCPKT_IOCTL if the packet driver 989 * is turned on. 990 */ 991 if (*(int *)data) { 992 if (pti->pt_flags & PF_PKT) { 993 pti->pt_send |= TIOCPKT_IOCTL; 994 ptcwakeup(tp, FREAD); 995 } 996 SET(tp->t_lflag, EXTPROC); 997 } else { 998 if (ISSET(tp->t_lflag, EXTPROC) && 999 (pti->pt_flags & PF_PKT)) { 1000 pti->pt_send |= TIOCPKT_IOCTL; 1001 ptcwakeup(tp, FREAD); 1002 } 1003 CLR(tp->t_lflag, EXTPROC); 1004 } 1005 return(0); 1006 } 1007 1008 #ifndef NO_DEV_PTM 1009 /* Allow getting the name from either the master or the slave */ 1010 if (cmd == TIOCPTSNAME) 1011 return pty_fill_ptmget(l, dev, -1, -1, data); 1012 #endif 1013 1014 cdev = cdevsw_lookup(dev); 1015 if (cdev != NULL && cdev->d_open == ptcopen) 1016 switch (cmd) { 1017 #ifndef NO_DEV_PTM 1018 case TIOCGRANTPT: 1019 return pty_grant_slave(l, dev); 1020 #endif 1021 1022 case TIOCGPGRP: 1023 /* 1024 * We avoid calling ttioctl on the controller since, 1025 * in that case, tp must be the controlling terminal. 1026 */ 1027 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1028 return (0); 1029 1030 case TIOCPKT: 1031 if (*(int *)data) { 1032 if (pti->pt_flags & PF_UCNTL) 1033 return (EINVAL); 1034 pti->pt_flags |= PF_PKT; 1035 } else 1036 pti->pt_flags &= ~PF_PKT; 1037 return (0); 1038 1039 case TIOCUCNTL: 1040 if (*(int *)data) { 1041 if (pti->pt_flags & PF_PKT) 1042 return (EINVAL); 1043 pti->pt_flags |= PF_UCNTL; 1044 } else 1045 pti->pt_flags &= ~PF_UCNTL; 1046 return (0); 1047 1048 case TIOCREMOTE: 1049 if (*(int *)data) 1050 pti->pt_flags |= PF_REMOTE; 1051 else 1052 pti->pt_flags &= ~PF_REMOTE; 1053 mutex_spin_enter(&tty_lock); 1054 ttyflush(tp, FREAD|FWRITE); 1055 mutex_spin_exit(&tty_lock); 1056 return (0); 1057 1058 case TIOCSETP: 1059 case TIOCSETN: 1060 case TIOCSETD: 1061 case TIOCSETA: 1062 case TIOCSETAW: 1063 case TIOCSETAF: 1064 mutex_spin_enter(&tty_lock); 1065 ndflush(&tp->t_outq, tp->t_outq.c_cc); 1066 mutex_spin_exit(&tty_lock); 1067 break; 1068 1069 case TIOCSIG: 1070 sig = (int)(long)*(void **)data; 1071 if (sig <= 0 || sig >= NSIG) 1072 return (EINVAL); 1073 mutex_spin_enter(&tty_lock); 1074 if (!ISSET(tp->t_lflag, NOFLSH)) 1075 ttyflush(tp, FREAD|FWRITE); 1076 tp->t_state |= TS_SIGINFO; 1077 ttysig(tp, TTYSIG_PG1, sig); 1078 mutex_spin_exit(&tty_lock); 1079 return (0); 1080 1081 case FIONREAD: 1082 mutex_spin_enter(&tty_lock); 1083 *(int *)data = tp->t_outq.c_cc; 1084 mutex_spin_exit(&tty_lock); 1085 return (0); 1086 } 1087 1088 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 1089 if (error == EPASSTHROUGH) 1090 error = ttioctl(tp, cmd, data, flag, l); 1091 if (error == EPASSTHROUGH) { 1092 if (pti->pt_flags & PF_UCNTL && 1093 (cmd & ~0xff) == UIOCCMD(0)) { 1094 if (cmd & 0xff) { 1095 pti->pt_ucntl = (u_char)cmd; 1096 ptcwakeup(tp, FREAD); 1097 } 1098 return (0); 1099 } 1100 } 1101 /* 1102 * If external processing and packet mode send ioctl packet. 1103 */ 1104 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 1105 switch(cmd) { 1106 case TIOCSETA: 1107 case TIOCSETAW: 1108 case TIOCSETAF: 1109 case TIOCSETP: 1110 case TIOCSETN: 1111 case TIOCSETC: 1112 case TIOCSLTC: 1113 case TIOCLBIS: 1114 case TIOCLBIC: 1115 case TIOCLSET: 1116 pti->pt_send |= TIOCPKT_IOCTL; 1117 ptcwakeup(tp, FREAD); 1118 default: 1119 break; 1120 } 1121 } 1122 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 1123 && CCEQ(cc[VSTART], CTRL('q')); 1124 if (pti->pt_flags & PF_NOSTOP) { 1125 if (stop) { 1126 pti->pt_send &= ~TIOCPKT_NOSTOP; 1127 pti->pt_send |= TIOCPKT_DOSTOP; 1128 pti->pt_flags &= ~PF_NOSTOP; 1129 ptcwakeup(tp, FREAD); 1130 } 1131 } else { 1132 if (!stop) { 1133 pti->pt_send &= ~TIOCPKT_DOSTOP; 1134 pti->pt_send |= TIOCPKT_NOSTOP; 1135 pti->pt_flags |= PF_NOSTOP; 1136 ptcwakeup(tp, FREAD); 1137 } 1138 } 1139 return (error); 1140 } 1141