1 /* $NetBSD: tty_pty.c,v 1.114 2008/11/15 05:58:33 mrg 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 1.114 2008/11/15 05:58:33 mrg 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/malloc.h> 61 #include <sys/pty.h> 62 #include <sys/kauth.h> 63 64 #define DEFAULT_NPTYS 16 /* default number of initial ptys */ 65 #define DEFAULT_MAXPTYS 992 /* default maximum number of ptys */ 66 67 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 68 69 struct pt_softc { 70 struct tty *pt_tty; 71 int pt_flags; 72 struct selinfo pt_selr, pt_selw; 73 u_char pt_send; 74 u_char pt_ucntl; 75 }; 76 77 static struct pt_softc **pt_softc = NULL; /* pty array */ 78 static int maxptys = DEFAULT_MAXPTYS; /* maximum number of ptys (sysctable) */ 79 kmutex_t pt_softc_mutex; 80 int npty = 0; /* for pstat -t */ 81 82 #define PF_PKT 0x08 /* packet mode */ 83 #define PF_STOPPED 0x10 /* user told stopped */ 84 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 85 #define PF_NOSTOP 0x40 86 #define PF_UCNTL 0x80 /* user control mode */ 87 88 void ptyattach(int); 89 void ptcwakeup(struct tty *, int); 90 void ptsstart(struct tty *); 91 int pty_maxptys(int, int); 92 93 static struct pt_softc **ptyarralloc(int); 94 95 dev_type_open(ptcopen); 96 dev_type_close(ptcclose); 97 dev_type_read(ptcread); 98 dev_type_write(ptcwrite); 99 dev_type_poll(ptcpoll); 100 dev_type_kqfilter(ptckqfilter); 101 102 dev_type_open(ptsopen); 103 dev_type_close(ptsclose); 104 dev_type_read(ptsread); 105 dev_type_write(ptswrite); 106 dev_type_stop(ptsstop); 107 dev_type_poll(ptspoll); 108 109 dev_type_ioctl(ptyioctl); 110 dev_type_tty(ptytty); 111 112 const struct cdevsw ptc_cdevsw = { 113 ptcopen, ptcclose, ptcread, ptcwrite, ptyioctl, 114 nullstop, ptytty, ptcpoll, nommap, ptckqfilter, D_TTY 115 }; 116 117 const struct cdevsw pts_cdevsw = { 118 ptsopen, ptsclose, ptsread, ptswrite, ptyioctl, 119 ptsstop, ptytty, ptspoll, nommap, ttykqfilter, D_TTY 120 }; 121 122 #if defined(pmax) 123 const struct cdevsw ptc_ultrix_cdevsw = { 124 ptcopen, ptcclose, ptcread, ptcwrite, ptyioctl, 125 nullstop, ptytty, ptcpoll, nommap, ptckqfilter, D_TTY 126 }; 127 128 const struct cdevsw pts_ultrix_cdevsw = { 129 ptsopen, ptsclose, ptsread, ptswrite, ptyioctl, 130 ptsstop, ptytty, ptspoll, nommap, ttykqfilter, D_TTY 131 }; 132 #endif /* defined(pmax) */ 133 134 /* 135 * Check if a pty is free to use. 136 */ 137 int 138 pty_isfree(int minor, int lock) 139 { 140 struct pt_softc *pt = pt_softc[minor]; 141 if (lock) 142 mutex_enter(&pt_softc_mutex); 143 minor = pt == NULL || pt->pt_tty == NULL || 144 pt->pt_tty->t_oproc == NULL; 145 if (lock) 146 mutex_exit(&pt_softc_mutex); 147 return minor; 148 } 149 150 /* 151 * Allocate and zero array of nelem elements. 152 */ 153 static struct pt_softc ** 154 ptyarralloc(nelem) 155 int nelem; 156 { 157 struct pt_softc **pt; 158 nelem += 10; 159 pt = malloc(nelem * sizeof *pt, M_DEVBUF, M_WAITOK | M_ZERO); 160 return pt; 161 } 162 163 /* 164 * Check if the minor is correct and ensure necessary structures 165 * are properly allocated. 166 */ 167 int 168 pty_check(int ptn) 169 { 170 struct pt_softc *pti; 171 172 if (ptn >= npty) { 173 struct pt_softc **newpt, **oldpt; 174 int newnpty; 175 176 /* check if the requested pty can be granted */ 177 if (ptn >= maxptys) { 178 limit_reached: 179 tablefull("pty", "increase kern.maxptys"); 180 return (ENXIO); 181 } 182 183 /* Allocate a larger pty array */ 184 for (newnpty = npty; newnpty <= ptn;) 185 newnpty *= 2; 186 if (newnpty > maxptys) 187 newnpty = maxptys; 188 newpt = ptyarralloc(newnpty); 189 190 /* 191 * Now grab the pty array mutex - we need to ensure 192 * that the pty array is consistent while copying it's 193 * content to newly allocated, larger space; we also 194 * need to be safe against pty_maxptys(). 195 */ 196 mutex_enter(&pt_softc_mutex); 197 198 if (newnpty >= maxptys) { 199 /* limit cut away beneath us... */ 200 newnpty = maxptys; 201 if (ptn >= newnpty) { 202 mutex_exit(&pt_softc_mutex); 203 free(newpt, M_DEVBUF); 204 goto limit_reached; 205 } 206 } 207 208 /* 209 * If the pty array was not enlarged while we were waiting 210 * for mutex, copy current contents of pt_softc[] to newly 211 * allocated array and start using the new bigger array. 212 */ 213 if (newnpty > npty) { 214 memcpy(newpt, pt_softc, npty*sizeof(struct pt_softc *)); 215 oldpt = pt_softc; 216 pt_softc = newpt; 217 npty = newnpty; 218 } else { 219 /* was enlarged when waited for lock, free new space */ 220 oldpt = newpt; 221 } 222 223 mutex_exit(&pt_softc_mutex); 224 free(oldpt, M_DEVBUF); 225 } 226 227 /* 228 * If the entry is not yet allocated, allocate one. The mutex is 229 * needed so that the state of pt_softc[] array is consistant 230 * in case it has been lengthened above. 231 */ 232 if (!pt_softc[ptn]) { 233 pti = malloc(sizeof(struct pt_softc), 234 M_DEVBUF, M_WAITOK | M_ZERO); 235 236 selinit(&pti->pt_selr); 237 selinit(&pti->pt_selw); 238 pti->pt_tty = ttymalloc(); 239 240 mutex_enter(&pt_softc_mutex); 241 242 /* 243 * Check the entry again - it might have been 244 * added while we were waiting for mutex. 245 */ 246 if (pt_softc[ptn]) { 247 mutex_exit(&pt_softc_mutex); 248 ttyfree(pti->pt_tty); 249 seldestroy(&pti->pt_selr); 250 seldestroy(&pti->pt_selw); 251 free(pti, M_DEVBUF); 252 return (0); 253 } 254 tty_attach(pti->pt_tty); 255 pt_softc[ptn] = pti; 256 257 mutex_exit(&pt_softc_mutex); 258 } 259 260 return (0); 261 } 262 263 /* 264 * Set maxpty in thread-safe way. Returns 0 in case of error, otherwise 265 * new value of maxptys. 266 */ 267 int 268 pty_maxptys(newmax, set) 269 int newmax, set; 270 { 271 if (!set) 272 return (maxptys); 273 274 /* 275 * We have to grab the pt_softc lock, so that we would pick correct 276 * value of npty (might be modified in pty_check()). 277 */ 278 mutex_enter(&pt_softc_mutex); 279 280 /* 281 * The value cannot be set to value lower than the highest pty 282 * number ever allocated. 283 */ 284 if (newmax >= npty) 285 maxptys = newmax; 286 else 287 newmax = 0; 288 289 mutex_exit(&pt_softc_mutex); 290 291 return newmax; 292 } 293 294 /* 295 * Establish n (or default if n is 1) ptys in the system. 296 */ 297 void 298 ptyattach(n) 299 int n; 300 { 301 302 mutex_init(&pt_softc_mutex, MUTEX_DEFAULT, IPL_NONE); 303 304 /* maybe should allow 0 => none? */ 305 if (n <= 1) 306 n = DEFAULT_NPTYS; 307 pt_softc = ptyarralloc(n); 308 npty = n; 309 #ifndef NO_DEV_PTM 310 ptmattach(1); 311 #endif 312 } 313 314 /*ARGSUSED*/ 315 int 316 ptsopen(dev_t dev, int flag, int devtype, struct lwp *l) 317 { 318 struct pt_softc *pti; 319 struct tty *tp; 320 int error; 321 int ptn = minor(dev); 322 323 if ((error = pty_check(ptn)) != 0) 324 return (error); 325 326 mutex_spin_enter(&tty_lock); 327 pti = pt_softc[ptn]; 328 tp = pti->pt_tty; 329 if (!ISSET(tp->t_state, TS_ISOPEN)) { 330 ttychars(tp); /* Set up default chars */ 331 tp->t_iflag = TTYDEF_IFLAG; 332 tp->t_oflag = TTYDEF_OFLAG; 333 tp->t_lflag = TTYDEF_LFLAG; 334 tp->t_cflag = TTYDEF_CFLAG; 335 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 336 ttsetwater(tp); /* would be done in xxparam() */ 337 } else if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, 338 tp) != 0) { 339 mutex_spin_exit(&tty_lock); 340 return (EBUSY); 341 } 342 if (tp->t_oproc) /* Ctrlr still around. */ 343 SET(tp->t_state, TS_CARR_ON); 344 if (!ISSET(flag, O_NONBLOCK)) { 345 while (!ISSET(tp->t_state, TS_CARR_ON)) { 346 tp->t_wopen++; 347 error = ttysleep(tp, &tp->t_rawcv, true, 0); 348 tp->t_wopen--; 349 if (error) { 350 mutex_spin_exit(&tty_lock); 351 return (error); 352 } 353 } 354 } 355 mutex_spin_exit(&tty_lock); 356 error = (*tp->t_linesw->l_open)(dev, tp); 357 ptcwakeup(tp, FREAD|FWRITE); 358 return (error); 359 } 360 361 int 362 ptsclose(dev_t dev, int flag, int mode, struct lwp *l) 363 { 364 struct pt_softc *pti = pt_softc[minor(dev)]; 365 struct tty *tp = pti->pt_tty; 366 int error; 367 368 error = (*tp->t_linesw->l_close)(tp, flag); 369 error |= ttyclose(tp); 370 ptcwakeup(tp, FREAD|FWRITE); 371 return (error); 372 } 373 374 int 375 ptsread(dev, uio, flag) 376 dev_t dev; 377 struct uio *uio; 378 int flag; 379 { 380 struct proc *p = curproc; 381 struct pt_softc *pti = pt_softc[minor(dev)]; 382 struct tty *tp = pti->pt_tty; 383 int error = 0; 384 int cc, c; 385 386 again: 387 if (pti->pt_flags & PF_REMOTE) { 388 mutex_spin_enter(&tty_lock); 389 while (isbackground(p, tp)) { /* XXXSMP */ 390 if (sigismasked(curlwp, SIGTTIN) || 391 p->p_pgrp->pg_jobc == 0 || 392 p->p_lflag & PL_PPWAIT) { 393 mutex_spin_exit(&tty_lock); 394 return (EIO); 395 } 396 ttysig(tp, TTYSIG_PG1, SIGTTIN); 397 error = ttysleep(tp, &lbolt, true, 0); 398 if (error) { 399 mutex_spin_exit(&tty_lock); 400 return (error); 401 } 402 } 403 if (tp->t_canq.c_cc == 0) { 404 if (flag & IO_NDELAY) { 405 mutex_spin_exit(&tty_lock); 406 return (EWOULDBLOCK); 407 } 408 error = ttysleep(tp, &tp->t_cancv, true, 0); 409 mutex_spin_exit(&tty_lock); 410 if (error) 411 return (error); 412 goto again; 413 } 414 while(error == 0 && tp->t_canq.c_cc > 1 && uio->uio_resid > 0) { 415 c = getc(&tp->t_canq); 416 mutex_spin_exit(&tty_lock); 417 error = ureadc(c, uio); 418 mutex_spin_enter(&tty_lock); 419 /* Re-check terminal state here? */ 420 } 421 if (tp->t_canq.c_cc == 1) 422 (void) getc(&tp->t_canq); 423 cc = tp->t_canq.c_cc; 424 mutex_spin_exit(&tty_lock); 425 if (cc) 426 return (error); 427 } else if (tp->t_oproc) 428 error = (*tp->t_linesw->l_read)(tp, uio, flag); 429 ptcwakeup(tp, FWRITE); 430 return (error); 431 } 432 433 /* 434 * Write to pseudo-tty. 435 * Wakeups of controlling tty will happen 436 * indirectly, when tty driver calls ptsstart. 437 */ 438 int 439 ptswrite(dev, uio, flag) 440 dev_t dev; 441 struct uio *uio; 442 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, events, l) 457 dev_t dev; 458 int events; 459 struct lwp *l; 460 { 461 struct pt_softc *pti = pt_softc[minor(dev)]; 462 struct tty *tp = pti->pt_tty; 463 464 if (tp->t_oproc == 0) 465 return (POLLHUP); 466 467 return ((*tp->t_linesw->l_poll)(tp, events, l)); 468 } 469 470 /* 471 * Start output on pseudo-tty. 472 * Wake up process polling or sleeping for input from controlling tty. 473 */ 474 void 475 ptsstart(tp) 476 struct tty *tp; 477 { 478 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 479 480 KASSERT(mutex_owned(&tty_lock)); 481 482 if (ISSET(tp->t_state, TS_TTSTOP)) 483 return; 484 if (pti->pt_flags & PF_STOPPED) { 485 pti->pt_flags &= ~PF_STOPPED; 486 pti->pt_send = TIOCPKT_START; 487 } 488 489 selnotify(&pti->pt_selr, 0, NOTE_SUBMIT); 490 cv_broadcast(&tp->t_outcvf); 491 } 492 493 /* 494 * Stop output. 495 */ 496 void 497 ptsstop(tp, flush) 498 struct tty *tp; 499 int flush; 500 { 501 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 502 503 KASSERT(mutex_owned(&tty_lock)); 504 505 /* note: FLUSHREAD and FLUSHWRITE already ok */ 506 if (flush == 0) { 507 flush = TIOCPKT_STOP; 508 pti->pt_flags |= PF_STOPPED; 509 } else 510 pti->pt_flags &= ~PF_STOPPED; 511 pti->pt_send |= flush; 512 513 /* change of perspective */ 514 if (flush & FREAD) { 515 selnotify(&pti->pt_selw, 0, NOTE_SUBMIT); 516 cv_broadcast(&tp->t_rawcvf); 517 } 518 if (flush & FWRITE) { 519 selnotify(&pti->pt_selr, 0, NOTE_SUBMIT); 520 cv_broadcast(&tp->t_outcvf); 521 } 522 } 523 524 void 525 ptcwakeup(tp, flag) 526 struct tty *tp; 527 int flag; 528 { 529 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 530 531 mutex_spin_enter(&tty_lock); 532 if (flag & FREAD) { 533 selnotify(&pti->pt_selr, 0, NOTE_SUBMIT); 534 cv_broadcast(&tp->t_outcvf); 535 } 536 if (flag & FWRITE) { 537 selnotify(&pti->pt_selw, 0, NOTE_SUBMIT); 538 cv_broadcast(&tp->t_rawcvf); 539 } 540 mutex_spin_exit(&tty_lock); 541 } 542 543 /*ARGSUSED*/ 544 int 545 ptcopen(dev_t dev, int flag, int devtype, struct lwp *l) 546 { 547 struct pt_softc *pti; 548 struct tty *tp; 549 int error; 550 int ptn = minor(dev); 551 552 if ((error = pty_check(ptn)) != 0) 553 return (error); 554 555 pti = pt_softc[ptn]; 556 tp = pti->pt_tty; 557 558 mutex_spin_enter(&tty_lock); 559 if (tp->t_oproc) { 560 mutex_spin_exit(&tty_lock); 561 return (EIO); 562 } 563 tp->t_oproc = ptsstart; 564 mutex_spin_exit(&tty_lock); 565 (void)(*tp->t_linesw->l_modem)(tp, 1); 566 CLR(tp->t_lflag, EXTPROC); 567 pti->pt_flags = 0; 568 pti->pt_send = 0; 569 pti->pt_ucntl = 0; 570 return (0); 571 } 572 573 /*ARGSUSED*/ 574 int 575 ptcclose(dev_t dev, int flag, int devtype, struct lwp *l) 576 { 577 struct pt_softc *pti = pt_softc[minor(dev)]; 578 struct tty *tp = pti->pt_tty; 579 580 (void)(*tp->t_linesw->l_modem)(tp, 0); 581 mutex_spin_enter(&tty_lock); 582 CLR(tp->t_state, TS_CARR_ON); 583 tp->t_oproc = 0; /* mark closed */ 584 mutex_spin_exit(&tty_lock); 585 return (0); 586 } 587 588 int 589 ptcread(dev, uio, flag) 590 dev_t dev; 591 struct uio *uio; 592 int flag; 593 { 594 struct pt_softc *pti = pt_softc[minor(dev)]; 595 struct tty *tp = pti->pt_tty; 596 u_char bf[BUFSIZ]; 597 int error = 0, cc; 598 599 /* 600 * We want to block until the slave 601 * is open, and there's something to read; 602 * but if we lost the slave or we're NBIO, 603 * then return the appropriate error instead. 604 */ 605 mutex_spin_enter(&tty_lock); 606 for (;;) { 607 if (ISSET(tp->t_state, TS_ISOPEN)) { 608 if (pti->pt_flags & PF_PKT && pti->pt_send) { 609 mutex_spin_exit(&tty_lock); 610 error = ureadc((int)pti->pt_send, uio); 611 if (error) 612 return (error); 613 /* 614 * Since we don't have the tty locked, there's 615 * a risk of messing up `t_termios'. This is 616 * relevant only if the tty got closed and then 617 * opened again while we were out uiomoving. 618 */ 619 if (pti->pt_send & TIOCPKT_IOCTL) { 620 cc = min(uio->uio_resid, 621 sizeof(tp->t_termios)); 622 uiomove((void *) &tp->t_termios, 623 cc, uio); 624 } 625 pti->pt_send = 0; 626 return (0); 627 } 628 if (pti->pt_flags & PF_UCNTL && pti->pt_ucntl) { 629 mutex_spin_exit(&tty_lock); 630 error = ureadc((int)pti->pt_ucntl, uio); 631 if (error) 632 return (error); 633 pti->pt_ucntl = 0; 634 return (0); 635 } 636 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 637 break; 638 } 639 if (!ISSET(tp->t_state, TS_CARR_ON)) { 640 error = 0; /* EOF */ 641 goto out; 642 } 643 if (flag & IO_NDELAY) { 644 error = EWOULDBLOCK; 645 goto out; 646 } 647 error = cv_wait_sig(&tp->t_outcvf, &tty_lock); 648 if (error) 649 goto out; 650 } 651 652 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) { 653 mutex_spin_exit(&tty_lock); 654 error = ureadc(0, uio); 655 mutex_spin_enter(&tty_lock); 656 if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) 657 error = EIO; 658 } 659 while (uio->uio_resid > 0 && error == 0) { 660 cc = q_to_b(&tp->t_outq, bf, min(uio->uio_resid, BUFSIZ)); 661 if (cc <= 0) 662 break; 663 mutex_spin_exit(&tty_lock); 664 error = uiomove(bf, cc, uio); 665 mutex_spin_enter(&tty_lock); 666 if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) 667 error = EIO; 668 } 669 ttypull(tp); 670 out: 671 mutex_spin_exit(&tty_lock); 672 return (error); 673 } 674 675 676 int 677 ptcwrite(dev, uio, flag) 678 dev_t dev; 679 struct uio *uio; 680 int flag; 681 { 682 struct pt_softc *pti = pt_softc[minor(dev)]; 683 struct tty *tp = pti->pt_tty; 684 u_char *cp = NULL; 685 int cc = 0; 686 u_char locbuf[BUFSIZ]; 687 int cnt = 0; 688 int error = 0; 689 690 again: 691 mutex_spin_enter(&tty_lock); 692 if (!ISSET(tp->t_state, TS_ISOPEN)) 693 goto block; 694 if (pti->pt_flags & PF_REMOTE) { 695 if (tp->t_canq.c_cc) 696 goto block; 697 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 698 if (cc == 0) { 699 cc = min(uio->uio_resid, BUFSIZ); 700 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 701 cp = locbuf; 702 mutex_spin_exit(&tty_lock); 703 error = uiomove((void *)cp, cc, uio); 704 if (error) 705 return (error); 706 mutex_spin_enter(&tty_lock); 707 /* check again for safety */ 708 if (!ISSET(tp->t_state, TS_ISOPEN)) { 709 /* 710 * adjust for data copied in but not 711 * written 712 */ 713 uio->uio_resid += cc; 714 error = EIO; 715 goto out; 716 } 717 } 718 if (cc) 719 (void) b_to_q(cp, cc, &tp->t_canq); 720 cc = 0; 721 } 722 (void) putc(0, &tp->t_canq); 723 ttwakeup(tp); 724 cv_broadcast(&tp->t_cancv); 725 error = 0; 726 goto out; 727 } 728 while (uio->uio_resid > 0) { 729 if (cc == 0) { 730 cc = min(uio->uio_resid, BUFSIZ); 731 cp = locbuf; 732 mutex_spin_exit(&tty_lock); 733 error = uiomove((void *)cp, cc, uio); 734 if (error) 735 return (error); 736 mutex_spin_enter(&tty_lock); 737 /* check again for safety */ 738 if (!ISSET(tp->t_state, TS_ISOPEN)) { 739 /* adjust for data copied in but not written */ 740 uio->uio_resid += cc; 741 error = EIO; 742 goto out; 743 } 744 } 745 while (cc > 0) { 746 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 747 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_lflag, ICANON))) { 748 cv_broadcast(&tp->t_rawcv); 749 goto block; 750 } 751 /* XXX - should change l_rint to be called with lock 752 * see also tty.c:ttyinput_wlock() 753 */ 754 mutex_spin_exit(&tty_lock); 755 (*tp->t_linesw->l_rint)(*cp++, tp); 756 mutex_spin_enter(&tty_lock); 757 cnt++; 758 cc--; 759 } 760 cc = 0; 761 } 762 error = 0; 763 goto out; 764 765 block: 766 /* 767 * Come here to wait for slave to open, for space 768 * in outq, or space in rawq. 769 */ 770 if (!ISSET(tp->t_state, TS_CARR_ON)) { 771 /* adjust for data copied in but not written */ 772 uio->uio_resid += cc; 773 error = EIO; 774 goto out; 775 } 776 if (flag & IO_NDELAY) { 777 /* adjust for data copied in but not written */ 778 uio->uio_resid += cc; 779 error = cnt == 0 ? EWOULDBLOCK : 0; 780 goto out; 781 } 782 error = cv_wait_sig(&tp->t_rawcv, &tty_lock); 783 mutex_spin_exit(&tty_lock); 784 if (error) { 785 /* adjust for data copied in but not written */ 786 uio->uio_resid += cc; 787 return (error); 788 } 789 goto again; 790 791 out: 792 mutex_spin_exit(&tty_lock); 793 return (error); 794 } 795 796 int 797 ptcpoll(dev, events, l) 798 dev_t dev; 799 int events; 800 struct lwp *l; 801 { 802 struct pt_softc *pti = pt_softc[minor(dev)]; 803 struct tty *tp = pti->pt_tty; 804 int revents = 0; 805 806 mutex_spin_enter(&tty_lock); 807 808 if (events & (POLLIN | POLLRDNORM)) 809 if (ISSET(tp->t_state, TS_ISOPEN) && 810 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 811 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 812 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 813 revents |= events & (POLLIN | POLLRDNORM); 814 815 if (events & (POLLOUT | POLLWRNORM)) 816 if (ISSET(tp->t_state, TS_ISOPEN) && 817 ((pti->pt_flags & PF_REMOTE) ? 818 (tp->t_canq.c_cc == 0) : 819 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 820 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))) 821 revents |= events & (POLLOUT | POLLWRNORM); 822 823 if (events & POLLHUP) 824 if (!ISSET(tp->t_state, TS_CARR_ON)) 825 revents |= POLLHUP; 826 827 if (revents == 0) { 828 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 829 selrecord(l, &pti->pt_selr); 830 831 if (events & (POLLOUT | POLLWRNORM)) 832 selrecord(l, &pti->pt_selw); 833 } 834 835 mutex_spin_exit(&tty_lock); 836 837 return (revents); 838 } 839 840 static void 841 filt_ptcrdetach(struct knote *kn) 842 { 843 struct pt_softc *pti; 844 struct tty *tp; 845 846 pti = kn->kn_hook; 847 tp = pti->pt_tty; 848 849 mutex_spin_enter(&tty_lock); 850 SLIST_REMOVE(&pti->pt_selr.sel_klist, kn, knote, kn_selnext); 851 mutex_spin_exit(&tty_lock); 852 } 853 854 static int 855 filt_ptcread(struct knote *kn, long hint) 856 { 857 struct pt_softc *pti; 858 struct tty *tp; 859 int canread; 860 861 pti = kn->kn_hook; 862 tp = pti->pt_tty; 863 864 if ((hint & NOTE_SUBMIT) == 0) { 865 mutex_spin_enter(&tty_lock); 866 } 867 868 canread = (ISSET(tp->t_state, TS_ISOPEN) && 869 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 870 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 871 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))); 872 873 if (canread) { 874 /* 875 * c_cc is number of characters after output post-processing; 876 * the amount of data actually read(2) depends on 877 * setting of input flags for the terminal. 878 */ 879 kn->kn_data = tp->t_outq.c_cc; 880 if (((pti->pt_flags & PF_PKT) && pti->pt_send) || 881 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)) 882 kn->kn_data++; 883 } 884 885 if ((hint & NOTE_SUBMIT) == 0) { 886 mutex_spin_exit(&tty_lock); 887 } 888 889 return (canread); 890 } 891 892 static void 893 filt_ptcwdetach(struct knote *kn) 894 { 895 struct pt_softc *pti; 896 struct tty *tp; 897 898 pti = kn->kn_hook; 899 tp = pti->pt_tty; 900 901 mutex_spin_enter(&tty_lock); 902 SLIST_REMOVE(&pti->pt_selw.sel_klist, kn, knote, kn_selnext); 903 mutex_spin_exit(&tty_lock); 904 } 905 906 static int 907 filt_ptcwrite(struct knote *kn, long hint) 908 { 909 struct pt_softc *pti; 910 struct tty *tp; 911 int canwrite; 912 int nwrite; 913 914 pti = kn->kn_hook; 915 tp = pti->pt_tty; 916 917 if ((hint & NOTE_SUBMIT) == 0) { 918 mutex_spin_enter(&tty_lock); 919 } 920 921 canwrite = (ISSET(tp->t_state, TS_ISOPEN) && 922 ((pti->pt_flags & PF_REMOTE) ? 923 (tp->t_canq.c_cc == 0) : 924 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 925 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))); 926 927 if (canwrite) { 928 if (pti->pt_flags & PF_REMOTE) 929 nwrite = tp->t_canq.c_cn; 930 else { 931 /* this is guaranteed to be > 0 due to above check */ 932 nwrite = tp->t_canq.c_cn 933 - (tp->t_rawq.c_cc + tp->t_canq.c_cc); 934 } 935 kn->kn_data = nwrite; 936 } 937 938 if ((hint & NOTE_SUBMIT) == 0) { 939 mutex_spin_exit(&tty_lock); 940 } 941 942 return (canwrite); 943 } 944 945 static const struct filterops ptcread_filtops = 946 { 1, NULL, filt_ptcrdetach, filt_ptcread }; 947 static const struct filterops ptcwrite_filtops = 948 { 1, NULL, filt_ptcwdetach, filt_ptcwrite }; 949 950 int 951 ptckqfilter(dev_t dev, struct knote *kn) 952 { 953 struct pt_softc *pti = pt_softc[minor(dev)]; 954 struct klist *klist; 955 956 switch (kn->kn_filter) { 957 case EVFILT_READ: 958 klist = &pti->pt_selr.sel_klist; 959 kn->kn_fop = &ptcread_filtops; 960 break; 961 case EVFILT_WRITE: 962 klist = &pti->pt_selw.sel_klist; 963 kn->kn_fop = &ptcwrite_filtops; 964 break; 965 default: 966 return (EINVAL); 967 } 968 969 kn->kn_hook = pti; 970 971 mutex_spin_enter(&tty_lock); 972 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 973 mutex_spin_exit(&tty_lock); 974 975 return (0); 976 } 977 978 struct tty * 979 ptytty(dev) 980 dev_t dev; 981 { 982 struct pt_softc *pti = pt_softc[minor(dev)]; 983 struct tty *tp = pti->pt_tty; 984 985 return (tp); 986 } 987 988 /*ARGSUSED*/ 989 int 990 ptyioctl(dev, cmd, data, flag, l) 991 dev_t dev; 992 u_long cmd; 993 void *data; 994 int flag; 995 struct lwp *l; 996 { 997 struct pt_softc *pti = pt_softc[minor(dev)]; 998 struct tty *tp = pti->pt_tty; 999 const struct cdevsw *cdev; 1000 u_char *cc = tp->t_cc; 1001 int stop, error, sig; 1002 1003 /* 1004 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 1005 * ttywflush(tp) will hang if there are characters in the outq. 1006 */ 1007 if (cmd == TIOCEXT) { 1008 /* 1009 * When the EXTPROC bit is being toggled, we need 1010 * to send an TIOCPKT_IOCTL if the packet driver 1011 * is turned on. 1012 */ 1013 if (*(int *)data) { 1014 if (pti->pt_flags & PF_PKT) { 1015 pti->pt_send |= TIOCPKT_IOCTL; 1016 ptcwakeup(tp, FREAD); 1017 } 1018 SET(tp->t_lflag, EXTPROC); 1019 } else { 1020 if (ISSET(tp->t_lflag, EXTPROC) && 1021 (pti->pt_flags & PF_PKT)) { 1022 pti->pt_send |= TIOCPKT_IOCTL; 1023 ptcwakeup(tp, FREAD); 1024 } 1025 CLR(tp->t_lflag, EXTPROC); 1026 } 1027 return(0); 1028 } 1029 1030 #ifndef NO_DEV_PTM 1031 /* Allow getting the name from either the master or the slave */ 1032 if (cmd == TIOCPTSNAME) 1033 return pty_fill_ptmget(l, dev, -1, -1, data); 1034 #endif 1035 1036 cdev = cdevsw_lookup(dev); 1037 if (cdev != NULL && cdev->d_open == ptcopen) 1038 switch (cmd) { 1039 #ifndef NO_DEV_PTM 1040 case TIOCGRANTPT: 1041 return pty_grant_slave(l, dev); 1042 #endif 1043 1044 case TIOCGPGRP: 1045 /* 1046 * We avoid calling ttioctl on the controller since, 1047 * in that case, tp must be the controlling terminal. 1048 */ 1049 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1050 return (0); 1051 1052 case TIOCPKT: 1053 if (*(int *)data) { 1054 if (pti->pt_flags & PF_UCNTL) 1055 return (EINVAL); 1056 pti->pt_flags |= PF_PKT; 1057 } else 1058 pti->pt_flags &= ~PF_PKT; 1059 return (0); 1060 1061 case TIOCUCNTL: 1062 if (*(int *)data) { 1063 if (pti->pt_flags & PF_PKT) 1064 return (EINVAL); 1065 pti->pt_flags |= PF_UCNTL; 1066 } else 1067 pti->pt_flags &= ~PF_UCNTL; 1068 return (0); 1069 1070 case TIOCREMOTE: 1071 if (*(int *)data) 1072 pti->pt_flags |= PF_REMOTE; 1073 else 1074 pti->pt_flags &= ~PF_REMOTE; 1075 mutex_spin_enter(&tty_lock); 1076 ttyflush(tp, FREAD|FWRITE); 1077 mutex_spin_exit(&tty_lock); 1078 return (0); 1079 1080 case TIOCSETP: 1081 case TIOCSETN: 1082 case TIOCSETD: 1083 case TIOCSETA: 1084 case TIOCSETAW: 1085 case TIOCSETAF: 1086 mutex_spin_enter(&tty_lock); 1087 ndflush(&tp->t_outq, tp->t_outq.c_cc); 1088 mutex_spin_exit(&tty_lock); 1089 break; 1090 1091 case TIOCSIG: 1092 sig = (int)(long)*(void **)data; 1093 if (sig <= 0 || sig >= NSIG) 1094 return (EINVAL); 1095 mutex_spin_enter(&tty_lock); 1096 if (!ISSET(tp->t_lflag, NOFLSH)) 1097 ttyflush(tp, FREAD|FWRITE); 1098 tp->t_state |= TS_SIGINFO; 1099 ttysig(tp, TTYSIG_PG1, sig); 1100 mutex_spin_exit(&tty_lock); 1101 return (0); 1102 1103 case FIONREAD: 1104 mutex_spin_enter(&tty_lock); 1105 *(int *)data = tp->t_outq.c_cc; 1106 mutex_spin_exit(&tty_lock); 1107 return (0); 1108 } 1109 1110 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 1111 if (error == EPASSTHROUGH) 1112 error = ttioctl(tp, cmd, data, flag, l); 1113 if (error == EPASSTHROUGH) { 1114 if (pti->pt_flags & PF_UCNTL && 1115 (cmd & ~0xff) == UIOCCMD(0)) { 1116 if (cmd & 0xff) { 1117 pti->pt_ucntl = (u_char)cmd; 1118 ptcwakeup(tp, FREAD); 1119 } 1120 return (0); 1121 } 1122 } 1123 /* 1124 * If external processing and packet mode send ioctl packet. 1125 */ 1126 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 1127 switch(cmd) { 1128 case TIOCSETA: 1129 case TIOCSETAW: 1130 case TIOCSETAF: 1131 case TIOCSETP: 1132 case TIOCSETN: 1133 case TIOCSETC: 1134 case TIOCSLTC: 1135 case TIOCLBIS: 1136 case TIOCLBIC: 1137 case TIOCLSET: 1138 pti->pt_send |= TIOCPKT_IOCTL; 1139 ptcwakeup(tp, FREAD); 1140 default: 1141 break; 1142 } 1143 } 1144 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 1145 && CCEQ(cc[VSTART], CTRL('q')); 1146 if (pti->pt_flags & PF_NOSTOP) { 1147 if (stop) { 1148 pti->pt_send &= ~TIOCPKT_NOSTOP; 1149 pti->pt_send |= TIOCPKT_DOSTOP; 1150 pti->pt_flags &= ~PF_NOSTOP; 1151 ptcwakeup(tp, FREAD); 1152 } 1153 } else { 1154 if (!stop) { 1155 pti->pt_send &= ~TIOCPKT_DOSTOP; 1156 pti->pt_send |= TIOCPKT_NOSTOP; 1157 pti->pt_flags |= PF_NOSTOP; 1158 ptcwakeup(tp, FREAD); 1159 } 1160 } 1161 return (error); 1162 } 1163