1 /* $NetBSD: tty_pty.c,v 1.120 2009/12/20 19:06:44 pooka 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 1.120 2009/12/20 19:06:44 pooka 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 /* see arch/pmax/conf/majors.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(int nelem) 155 { 156 struct pt_softc **pt; 157 nelem += 10; 158 pt = kmem_zalloc(nelem * sizeof(*pt), KM_SLEEP); 159 return pt; 160 } 161 162 static void 163 ptyarrfree(struct pt_softc **pt, int nelem) 164 { 165 166 nelem += 10; 167 kmem_free(pt, nelem * sizeof(*pt)); 168 } 169 170 /* 171 * Check if the minor is correct and ensure necessary structures 172 * are properly allocated. 173 */ 174 int 175 pty_check(int ptn) 176 { 177 struct pt_softc *pti; 178 179 if (ptn >= npty) { 180 struct pt_softc **newpt, **oldpt; 181 int newnpty; 182 int oldnpty; 183 184 /* check if the requested pty can be granted */ 185 if (ptn >= maxptys) { 186 limit_reached: 187 tablefull("pty", "increase kern.maxptys"); 188 return (ENXIO); 189 } 190 191 /* Allocate a larger pty array */ 192 for (newnpty = npty; newnpty <= ptn;) 193 newnpty *= 2; 194 if (newnpty > maxptys) 195 newnpty = maxptys; 196 newpt = ptyarralloc(newnpty); 197 198 /* 199 * Now grab the pty array mutex - we need to ensure 200 * that the pty array is consistent while copying it's 201 * content to newly allocated, larger space; we also 202 * need to be safe against pty_maxptys(). 203 */ 204 mutex_enter(&pt_softc_mutex); 205 206 if (newnpty >= maxptys) { 207 /* limit cut away beneath us... */ 208 if (ptn >= maxptys) { 209 mutex_exit(&pt_softc_mutex); 210 ptyarrfree(newpt, newnpty); 211 goto limit_reached; 212 } 213 newnpty = maxptys; 214 } 215 216 /* 217 * If the pty array was not enlarged while we were waiting 218 * for mutex, copy current contents of pt_softc[] to newly 219 * allocated array and start using the new bigger array. 220 */ 221 if (newnpty > npty) { 222 memcpy(newpt, pt_softc, npty*sizeof(struct pt_softc *)); 223 oldpt = pt_softc; 224 oldnpty = npty; 225 pt_softc = newpt; 226 npty = newnpty; 227 } else { 228 /* was enlarged when waited for lock, free new space */ 229 oldpt = newpt; 230 oldnpty = newnpty; 231 } 232 233 mutex_exit(&pt_softc_mutex); 234 ptyarrfree(oldpt, oldnpty); 235 } 236 237 /* 238 * If the entry is not yet allocated, allocate one. The mutex is 239 * needed so that the state of pt_softc[] array is consistant 240 * in case it has been lengthened above. 241 */ 242 if (!pt_softc[ptn]) { 243 pti = kmem_zalloc(sizeof(*pti), KM_SLEEP); 244 245 selinit(&pti->pt_selr); 246 selinit(&pti->pt_selw); 247 pti->pt_tty = ttymalloc(); 248 249 mutex_enter(&pt_softc_mutex); 250 251 /* 252 * Check the entry again - it might have been 253 * added while we were waiting for mutex. 254 */ 255 if (pt_softc[ptn]) { 256 mutex_exit(&pt_softc_mutex); 257 ttyfree(pti->pt_tty); 258 seldestroy(&pti->pt_selr); 259 seldestroy(&pti->pt_selw); 260 kmem_free(pti, sizeof(*pti)); 261 return (0); 262 } 263 tty_attach(pti->pt_tty); 264 pt_softc[ptn] = pti; 265 266 mutex_exit(&pt_softc_mutex); 267 } 268 269 return (0); 270 } 271 272 /* 273 * Set maxpty in thread-safe way. Returns 0 in case of error, otherwise 274 * new value of maxptys. 275 */ 276 int 277 pty_maxptys(int newmax, int set) 278 { 279 if (!set) 280 return (maxptys); 281 282 /* 283 * We have to grab the pt_softc lock, so that we would pick correct 284 * value of npty (might be modified in pty_check()). 285 */ 286 mutex_enter(&pt_softc_mutex); 287 288 /* 289 * The value cannot be set to value lower than the highest pty 290 * number ever allocated. 291 */ 292 if (newmax >= npty) 293 maxptys = newmax; 294 else 295 newmax = 0; 296 297 mutex_exit(&pt_softc_mutex); 298 299 return newmax; 300 } 301 302 /* 303 * Establish n (or default if n is 1) ptys in the system. 304 */ 305 void 306 ptyattach(int n) 307 { 308 309 mutex_init(&pt_softc_mutex, MUTEX_DEFAULT, IPL_NONE); 310 311 /* maybe should allow 0 => none? */ 312 if (n <= 1) 313 n = DEFAULT_NPTYS; 314 pt_softc = ptyarralloc(n); 315 npty = n; 316 #ifndef NO_DEV_PTM 317 ptmattach(1); 318 #endif 319 } 320 321 /*ARGSUSED*/ 322 int 323 ptsopen(dev_t dev, int flag, int devtype, struct lwp *l) 324 { 325 struct pt_softc *pti; 326 struct tty *tp; 327 int error; 328 int ptn = minor(dev); 329 330 if ((error = pty_check(ptn)) != 0) 331 return (error); 332 333 mutex_spin_enter(&tty_lock); 334 pti = pt_softc[ptn]; 335 tp = pti->pt_tty; 336 if (!ISSET(tp->t_state, TS_ISOPEN)) { 337 ttychars(tp); /* Set up default chars */ 338 tp->t_iflag = TTYDEF_IFLAG; 339 tp->t_oflag = TTYDEF_OFLAG; 340 tp->t_lflag = TTYDEF_LFLAG; 341 tp->t_cflag = TTYDEF_CFLAG; 342 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 343 ttsetwater(tp); /* would be done in xxparam() */ 344 } else if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, 345 tp) != 0) { 346 mutex_spin_exit(&tty_lock); 347 return (EBUSY); 348 } 349 if (tp->t_oproc) /* Ctrlr still around. */ 350 SET(tp->t_state, TS_CARR_ON); 351 if (!ISSET(flag, O_NONBLOCK)) { 352 while (!ISSET(tp->t_state, TS_CARR_ON)) { 353 tp->t_wopen++; 354 error = ttysleep(tp, &tp->t_rawcv, true, 0); 355 tp->t_wopen--; 356 if (error) { 357 mutex_spin_exit(&tty_lock); 358 return (error); 359 } 360 } 361 } 362 mutex_spin_exit(&tty_lock); 363 error = (*tp->t_linesw->l_open)(dev, tp); 364 ptcwakeup(tp, FREAD|FWRITE); 365 return (error); 366 } 367 368 int 369 ptsclose(dev_t dev, int flag, int mode, struct lwp *l) 370 { 371 struct pt_softc *pti = pt_softc[minor(dev)]; 372 struct tty *tp = pti->pt_tty; 373 int error; 374 375 error = (*tp->t_linesw->l_close)(tp, flag); 376 error |= ttyclose(tp); 377 ptcwakeup(tp, FREAD|FWRITE); 378 return (error); 379 } 380 381 int 382 ptsread(dev_t dev, struct uio *uio, int flag) 383 { 384 struct proc *p = curproc; 385 struct pt_softc *pti = pt_softc[minor(dev)]; 386 struct tty *tp = pti->pt_tty; 387 int error = 0; 388 int cc, c; 389 390 again: 391 if (pti->pt_flags & PF_REMOTE) { 392 mutex_spin_enter(&tty_lock); 393 while (isbackground(p, tp)) { /* XXXSMP */ 394 if (sigismasked(curlwp, SIGTTIN) || 395 p->p_pgrp->pg_jobc == 0 || 396 p->p_lflag & PL_PPWAIT) { 397 mutex_spin_exit(&tty_lock); 398 return (EIO); 399 } 400 ttysig(tp, TTYSIG_PG1, SIGTTIN); 401 error = ttysleep(tp, &lbolt, true, 0); 402 if (error) { 403 mutex_spin_exit(&tty_lock); 404 return (error); 405 } 406 } 407 if (tp->t_canq.c_cc == 0) { 408 if (flag & IO_NDELAY) { 409 mutex_spin_exit(&tty_lock); 410 return (EWOULDBLOCK); 411 } 412 error = ttysleep(tp, &tp->t_cancv, true, 0); 413 mutex_spin_exit(&tty_lock); 414 if (error) 415 return (error); 416 goto again; 417 } 418 while(error == 0 && tp->t_canq.c_cc > 1 && uio->uio_resid > 0) { 419 c = getc(&tp->t_canq); 420 mutex_spin_exit(&tty_lock); 421 error = ureadc(c, uio); 422 mutex_spin_enter(&tty_lock); 423 /* Re-check terminal state here? */ 424 } 425 if (tp->t_canq.c_cc == 1) 426 (void) getc(&tp->t_canq); 427 cc = tp->t_canq.c_cc; 428 mutex_spin_exit(&tty_lock); 429 if (cc) 430 return (error); 431 } else if (tp->t_oproc) 432 error = (*tp->t_linesw->l_read)(tp, uio, flag); 433 ptcwakeup(tp, FWRITE); 434 return (error); 435 } 436 437 /* 438 * Write to pseudo-tty. 439 * Wakeups of controlling tty will happen 440 * indirectly, when tty driver calls ptsstart. 441 */ 442 int 443 ptswrite(dev_t dev, struct uio *uio, int flag) 444 { 445 struct pt_softc *pti = pt_softc[minor(dev)]; 446 struct tty *tp = pti->pt_tty; 447 448 if (tp->t_oproc == 0) 449 return (EIO); 450 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 451 } 452 453 /* 454 * Poll pseudo-tty. 455 */ 456 int 457 ptspoll(dev_t dev, int events, struct lwp *l) 458 { 459 struct pt_softc *pti = pt_softc[minor(dev)]; 460 struct tty *tp = pti->pt_tty; 461 462 if (tp->t_oproc == 0) 463 return (POLLHUP); 464 465 return ((*tp->t_linesw->l_poll)(tp, events, l)); 466 } 467 468 /* 469 * Start output on pseudo-tty. 470 * Wake up process polling or sleeping for input from controlling tty. 471 */ 472 void 473 ptsstart(struct tty *tp) 474 { 475 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 476 477 KASSERT(mutex_owned(&tty_lock)); 478 479 if (ISSET(tp->t_state, TS_TTSTOP)) 480 return; 481 if (pti->pt_flags & PF_STOPPED) { 482 pti->pt_flags &= ~PF_STOPPED; 483 pti->pt_send = TIOCPKT_START; 484 } 485 486 selnotify(&pti->pt_selr, 0, NOTE_SUBMIT); 487 cv_broadcast(&tp->t_outcvf); 488 } 489 490 /* 491 * Stop output. 492 */ 493 void 494 ptsstop(struct tty *tp, int flush) 495 { 496 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 497 498 KASSERT(mutex_owned(&tty_lock)); 499 500 /* note: FLUSHREAD and FLUSHWRITE already ok */ 501 if (flush == 0) { 502 flush = TIOCPKT_STOP; 503 pti->pt_flags |= PF_STOPPED; 504 } else 505 pti->pt_flags &= ~PF_STOPPED; 506 pti->pt_send |= flush; 507 508 /* change of perspective */ 509 if (flush & FREAD) { 510 selnotify(&pti->pt_selw, 0, NOTE_SUBMIT); 511 cv_broadcast(&tp->t_rawcvf); 512 } 513 if (flush & FWRITE) { 514 selnotify(&pti->pt_selr, 0, NOTE_SUBMIT); 515 cv_broadcast(&tp->t_outcvf); 516 } 517 } 518 519 void 520 ptcwakeup(struct tty *tp, int flag) 521 { 522 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 523 524 mutex_spin_enter(&tty_lock); 525 if (flag & FREAD) { 526 selnotify(&pti->pt_selr, 0, NOTE_SUBMIT); 527 cv_broadcast(&tp->t_outcvf); 528 } 529 if (flag & FWRITE) { 530 selnotify(&pti->pt_selw, 0, NOTE_SUBMIT); 531 cv_broadcast(&tp->t_rawcvf); 532 } 533 mutex_spin_exit(&tty_lock); 534 } 535 536 /*ARGSUSED*/ 537 int 538 ptcopen(dev_t dev, int flag, int devtype, struct lwp *l) 539 { 540 struct pt_softc *pti; 541 struct tty *tp; 542 int error; 543 int ptn = minor(dev); 544 545 if ((error = pty_check(ptn)) != 0) 546 return (error); 547 548 pti = pt_softc[ptn]; 549 tp = pti->pt_tty; 550 551 mutex_spin_enter(&tty_lock); 552 if (tp->t_oproc) { 553 mutex_spin_exit(&tty_lock); 554 return (EIO); 555 } 556 tp->t_oproc = ptsstart; 557 mutex_spin_exit(&tty_lock); 558 (void)(*tp->t_linesw->l_modem)(tp, 1); 559 CLR(tp->t_lflag, EXTPROC); 560 pti->pt_flags = 0; 561 pti->pt_send = 0; 562 pti->pt_ucntl = 0; 563 return (0); 564 } 565 566 /*ARGSUSED*/ 567 int 568 ptcclose(dev_t dev, int flag, int devtype, struct lwp *l) 569 { 570 struct pt_softc *pti = pt_softc[minor(dev)]; 571 struct tty *tp = pti->pt_tty; 572 573 (void)(*tp->t_linesw->l_modem)(tp, 0); 574 mutex_spin_enter(&tty_lock); 575 CLR(tp->t_state, TS_CARR_ON); 576 tp->t_oproc = 0; /* mark closed */ 577 mutex_spin_exit(&tty_lock); 578 return (0); 579 } 580 581 int 582 ptcread(dev_t dev, struct uio *uio, int flag) 583 { 584 struct pt_softc *pti = pt_softc[minor(dev)]; 585 struct tty *tp = pti->pt_tty; 586 u_char bf[BUFSIZ]; 587 int error = 0, cc; 588 int c; 589 590 if (uio->uio_resid <= 0) 591 return EINVAL; 592 593 /* 594 * We want to block until the slave 595 * is open, and there's something to read; 596 * but if we lost the slave or we're NBIO, 597 * then return the appropriate error instead. 598 */ 599 mutex_spin_enter(&tty_lock); 600 for (;;) { 601 if (ISSET(tp->t_state, TS_ISOPEN)) { 602 if (pti->pt_flags & PF_PKT && (c = pti->pt_send)) { 603 pti->pt_send = 0; 604 mutex_spin_exit(&tty_lock); 605 error = ureadc(c, uio); 606 if (error) 607 return (error); 608 /* 609 * Since we don't have the tty locked, there's 610 * a risk of messing up `t_termios'. This is 611 * relevant only if the tty got closed and then 612 * opened again while we were out uiomoving. 613 */ 614 if (pti->pt_send & TIOCPKT_IOCTL) { 615 cc = min(uio->uio_resid, 616 sizeof(tp->t_termios)); 617 uiomove((void *) &tp->t_termios, 618 cc, uio); 619 } 620 return (0); 621 } 622 if (pti->pt_flags & PF_UCNTL && (c = pti->pt_ucntl)) { 623 pti->pt_ucntl = 0; 624 mutex_spin_exit(&tty_lock); 625 error = ureadc(c, uio); 626 if (error) 627 return (error); 628 return (0); 629 } 630 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 631 break; 632 } 633 if (!ISSET(tp->t_state, TS_CARR_ON)) { 634 error = 0; /* EOF */ 635 goto out; 636 } 637 if (flag & IO_NDELAY) { 638 error = EWOULDBLOCK; 639 goto out; 640 } 641 error = cv_wait_sig(&tp->t_outcvf, &tty_lock); 642 if (error) 643 goto out; 644 } 645 646 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) { 647 mutex_spin_exit(&tty_lock); 648 error = ureadc(0, uio); 649 mutex_spin_enter(&tty_lock); 650 if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) 651 error = EIO; 652 } 653 while (uio->uio_resid > 0 && error == 0) { 654 cc = q_to_b(&tp->t_outq, bf, min(uio->uio_resid, BUFSIZ)); 655 if (cc <= 0) 656 break; 657 mutex_spin_exit(&tty_lock); 658 error = uiomove(bf, cc, uio); 659 mutex_spin_enter(&tty_lock); 660 if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) 661 error = EIO; 662 } 663 ttypull(tp); 664 out: 665 mutex_spin_exit(&tty_lock); 666 return (error); 667 } 668 669 670 int 671 ptcwrite(dev_t dev, struct uio *uio, int flag) 672 { 673 struct pt_softc *pti = pt_softc[minor(dev)]; 674 struct tty *tp = pti->pt_tty; 675 u_char *cp = NULL; 676 int cc = 0; 677 u_char locbuf[BUFSIZ]; 678 int cnt = 0; 679 int error = 0; 680 681 again: 682 mutex_spin_enter(&tty_lock); 683 if (!ISSET(tp->t_state, TS_ISOPEN)) 684 goto block; 685 if (pti->pt_flags & PF_REMOTE) { 686 if (tp->t_canq.c_cc) 687 goto block; 688 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 689 if (cc == 0) { 690 cc = min(uio->uio_resid, BUFSIZ); 691 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 692 cp = locbuf; 693 mutex_spin_exit(&tty_lock); 694 error = uiomove((void *)cp, cc, uio); 695 if (error) 696 return (error); 697 mutex_spin_enter(&tty_lock); 698 /* check again for safety */ 699 if (!ISSET(tp->t_state, TS_ISOPEN)) { 700 /* 701 * adjust for data copied in but not 702 * written 703 */ 704 uio->uio_resid += cc; 705 error = EIO; 706 goto out; 707 } 708 } 709 if (cc) 710 (void) b_to_q(cp, cc, &tp->t_canq); 711 cc = 0; 712 } 713 (void) putc(0, &tp->t_canq); 714 ttwakeup(tp); 715 cv_broadcast(&tp->t_cancv); 716 error = 0; 717 goto out; 718 } 719 while (uio->uio_resid > 0) { 720 if (cc == 0) { 721 cc = min(uio->uio_resid, BUFSIZ); 722 cp = locbuf; 723 mutex_spin_exit(&tty_lock); 724 error = uiomove((void *)cp, cc, uio); 725 if (error) 726 return (error); 727 mutex_spin_enter(&tty_lock); 728 /* check again for safety */ 729 if (!ISSET(tp->t_state, TS_ISOPEN)) { 730 /* adjust for data copied in but not written */ 731 uio->uio_resid += cc; 732 error = EIO; 733 goto out; 734 } 735 } 736 while (cc > 0) { 737 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 738 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_lflag, ICANON))) { 739 cv_broadcast(&tp->t_rawcv); 740 goto block; 741 } 742 /* XXX - should change l_rint to be called with lock 743 * see also tty.c:ttyinput_wlock() 744 */ 745 mutex_spin_exit(&tty_lock); 746 (*tp->t_linesw->l_rint)(*cp++, tp); 747 mutex_spin_enter(&tty_lock); 748 cnt++; 749 cc--; 750 } 751 cc = 0; 752 } 753 error = 0; 754 goto out; 755 756 block: 757 /* 758 * Come here to wait for slave to open, for space 759 * in outq, or space in rawq. 760 */ 761 if (!ISSET(tp->t_state, TS_CARR_ON)) { 762 /* adjust for data copied in but not written */ 763 uio->uio_resid += cc; 764 error = EIO; 765 goto out; 766 } 767 if (flag & IO_NDELAY) { 768 /* adjust for data copied in but not written */ 769 uio->uio_resid += cc; 770 error = cnt == 0 ? EWOULDBLOCK : 0; 771 goto out; 772 } 773 error = cv_wait_sig(&tp->t_rawcvf, &tty_lock); 774 mutex_spin_exit(&tty_lock); 775 if (error) { 776 /* adjust for data copied in but not written */ 777 uio->uio_resid += cc; 778 return (error); 779 } 780 goto again; 781 782 out: 783 mutex_spin_exit(&tty_lock); 784 return (error); 785 } 786 787 int 788 ptcpoll(dev_t dev, int events, struct lwp *l) 789 { 790 struct pt_softc *pti = pt_softc[minor(dev)]; 791 struct tty *tp = pti->pt_tty; 792 int revents = 0; 793 794 mutex_spin_enter(&tty_lock); 795 796 if (events & (POLLIN | POLLRDNORM)) 797 if (ISSET(tp->t_state, TS_ISOPEN) && 798 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 799 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 800 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 801 revents |= events & (POLLIN | POLLRDNORM); 802 803 if (events & (POLLOUT | POLLWRNORM)) 804 if (ISSET(tp->t_state, TS_ISOPEN) && 805 ((pti->pt_flags & PF_REMOTE) ? 806 (tp->t_canq.c_cc == 0) : 807 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 808 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))) 809 revents |= events & (POLLOUT | POLLWRNORM); 810 811 if (events & POLLHUP) 812 if (!ISSET(tp->t_state, TS_CARR_ON)) 813 revents |= POLLHUP; 814 815 if (revents == 0) { 816 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 817 selrecord(l, &pti->pt_selr); 818 819 if (events & (POLLOUT | POLLWRNORM)) 820 selrecord(l, &pti->pt_selw); 821 } 822 823 mutex_spin_exit(&tty_lock); 824 825 return (revents); 826 } 827 828 static void 829 filt_ptcrdetach(struct knote *kn) 830 { 831 struct pt_softc *pti; 832 struct tty *tp; 833 834 pti = kn->kn_hook; 835 tp = pti->pt_tty; 836 837 mutex_spin_enter(&tty_lock); 838 SLIST_REMOVE(&pti->pt_selr.sel_klist, kn, knote, kn_selnext); 839 mutex_spin_exit(&tty_lock); 840 } 841 842 static int 843 filt_ptcread(struct knote *kn, long hint) 844 { 845 struct pt_softc *pti; 846 struct tty *tp; 847 int canread; 848 849 pti = kn->kn_hook; 850 tp = pti->pt_tty; 851 852 if ((hint & NOTE_SUBMIT) == 0) { 853 mutex_spin_enter(&tty_lock); 854 } 855 856 canread = (ISSET(tp->t_state, TS_ISOPEN) && 857 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 858 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 859 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))); 860 861 if (canread) { 862 /* 863 * c_cc is number of characters after output post-processing; 864 * the amount of data actually read(2) depends on 865 * setting of input flags for the terminal. 866 */ 867 kn->kn_data = tp->t_outq.c_cc; 868 if (((pti->pt_flags & PF_PKT) && pti->pt_send) || 869 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)) 870 kn->kn_data++; 871 } 872 873 if ((hint & NOTE_SUBMIT) == 0) { 874 mutex_spin_exit(&tty_lock); 875 } 876 877 return (canread); 878 } 879 880 static void 881 filt_ptcwdetach(struct knote *kn) 882 { 883 struct pt_softc *pti; 884 struct tty *tp; 885 886 pti = kn->kn_hook; 887 tp = pti->pt_tty; 888 889 mutex_spin_enter(&tty_lock); 890 SLIST_REMOVE(&pti->pt_selw.sel_klist, kn, knote, kn_selnext); 891 mutex_spin_exit(&tty_lock); 892 } 893 894 static int 895 filt_ptcwrite(struct knote *kn, long hint) 896 { 897 struct pt_softc *pti; 898 struct tty *tp; 899 int canwrite; 900 int nwrite; 901 902 pti = kn->kn_hook; 903 tp = pti->pt_tty; 904 905 if ((hint & NOTE_SUBMIT) == 0) { 906 mutex_spin_enter(&tty_lock); 907 } 908 909 canwrite = (ISSET(tp->t_state, TS_ISOPEN) && 910 ((pti->pt_flags & PF_REMOTE) ? 911 (tp->t_canq.c_cc == 0) : 912 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 913 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))); 914 915 if (canwrite) { 916 if (pti->pt_flags & PF_REMOTE) 917 nwrite = tp->t_canq.c_cn; 918 else { 919 /* this is guaranteed to be > 0 due to above check */ 920 nwrite = tp->t_canq.c_cn 921 - (tp->t_rawq.c_cc + tp->t_canq.c_cc); 922 } 923 kn->kn_data = nwrite; 924 } 925 926 if ((hint & NOTE_SUBMIT) == 0) { 927 mutex_spin_exit(&tty_lock); 928 } 929 930 return (canwrite); 931 } 932 933 static const struct filterops ptcread_filtops = 934 { 1, NULL, filt_ptcrdetach, filt_ptcread }; 935 static const struct filterops ptcwrite_filtops = 936 { 1, NULL, filt_ptcwdetach, filt_ptcwrite }; 937 938 int 939 ptckqfilter(dev_t dev, struct knote *kn) 940 { 941 struct pt_softc *pti = pt_softc[minor(dev)]; 942 struct klist *klist; 943 944 switch (kn->kn_filter) { 945 case EVFILT_READ: 946 klist = &pti->pt_selr.sel_klist; 947 kn->kn_fop = &ptcread_filtops; 948 break; 949 case EVFILT_WRITE: 950 klist = &pti->pt_selw.sel_klist; 951 kn->kn_fop = &ptcwrite_filtops; 952 break; 953 default: 954 return (EINVAL); 955 } 956 957 kn->kn_hook = pti; 958 959 mutex_spin_enter(&tty_lock); 960 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 961 mutex_spin_exit(&tty_lock); 962 963 return (0); 964 } 965 966 struct tty * 967 ptytty(dev_t dev) 968 { 969 struct pt_softc *pti = pt_softc[minor(dev)]; 970 struct tty *tp = pti->pt_tty; 971 972 return (tp); 973 } 974 975 /*ARGSUSED*/ 976 int 977 ptyioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 978 { 979 struct pt_softc *pti = pt_softc[minor(dev)]; 980 struct tty *tp = pti->pt_tty; 981 const struct cdevsw *cdev; 982 u_char *cc = tp->t_cc; 983 int stop, error, sig; 984 985 /* 986 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 987 * ttywflush(tp) will hang if there are characters in the outq. 988 */ 989 if (cmd == TIOCEXT) { 990 /* 991 * When the EXTPROC bit is being toggled, we need 992 * to send an TIOCPKT_IOCTL if the packet driver 993 * is turned on. 994 */ 995 if (*(int *)data) { 996 if (pti->pt_flags & PF_PKT) { 997 pti->pt_send |= TIOCPKT_IOCTL; 998 ptcwakeup(tp, FREAD); 999 } 1000 SET(tp->t_lflag, EXTPROC); 1001 } else { 1002 if (ISSET(tp->t_lflag, EXTPROC) && 1003 (pti->pt_flags & PF_PKT)) { 1004 pti->pt_send |= TIOCPKT_IOCTL; 1005 ptcwakeup(tp, FREAD); 1006 } 1007 CLR(tp->t_lflag, EXTPROC); 1008 } 1009 return(0); 1010 } 1011 1012 #ifndef NO_DEV_PTM 1013 /* Allow getting the name from either the master or the slave */ 1014 if (cmd == TIOCPTSNAME) 1015 return pty_fill_ptmget(l, dev, -1, -1, data); 1016 #endif 1017 1018 cdev = cdevsw_lookup(dev); 1019 if (cdev != NULL && cdev->d_open == ptcopen) 1020 switch (cmd) { 1021 #ifndef NO_DEV_PTM 1022 case TIOCGRANTPT: 1023 return pty_grant_slave(l, dev); 1024 #endif 1025 1026 case TIOCGPGRP: 1027 /* 1028 * We avoid calling ttioctl on the controller since, 1029 * in that case, tp must be the controlling terminal. 1030 */ 1031 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1032 return (0); 1033 1034 case TIOCPKT: 1035 if (*(int *)data) { 1036 if (pti->pt_flags & PF_UCNTL) 1037 return (EINVAL); 1038 pti->pt_flags |= PF_PKT; 1039 } else 1040 pti->pt_flags &= ~PF_PKT; 1041 return (0); 1042 1043 case TIOCUCNTL: 1044 if (*(int *)data) { 1045 if (pti->pt_flags & PF_PKT) 1046 return (EINVAL); 1047 pti->pt_flags |= PF_UCNTL; 1048 } else 1049 pti->pt_flags &= ~PF_UCNTL; 1050 return (0); 1051 1052 case TIOCREMOTE: 1053 if (*(int *)data) 1054 pti->pt_flags |= PF_REMOTE; 1055 else 1056 pti->pt_flags &= ~PF_REMOTE; 1057 mutex_spin_enter(&tty_lock); 1058 ttyflush(tp, FREAD|FWRITE); 1059 mutex_spin_exit(&tty_lock); 1060 return (0); 1061 1062 case TIOCSETP: 1063 case TIOCSETN: 1064 case TIOCSETD: 1065 case TIOCSETA: 1066 case TIOCSETAW: 1067 case TIOCSETAF: 1068 mutex_spin_enter(&tty_lock); 1069 ndflush(&tp->t_outq, tp->t_outq.c_cc); 1070 mutex_spin_exit(&tty_lock); 1071 break; 1072 1073 case TIOCSIG: 1074 sig = (int)(long)*(void **)data; 1075 if (sig <= 0 || sig >= NSIG) 1076 return (EINVAL); 1077 mutex_spin_enter(&tty_lock); 1078 if (!ISSET(tp->t_lflag, NOFLSH)) 1079 ttyflush(tp, FREAD|FWRITE); 1080 tp->t_state |= TS_SIGINFO; 1081 ttysig(tp, TTYSIG_PG1, sig); 1082 mutex_spin_exit(&tty_lock); 1083 return (0); 1084 1085 case FIONREAD: 1086 mutex_spin_enter(&tty_lock); 1087 *(int *)data = tp->t_outq.c_cc; 1088 mutex_spin_exit(&tty_lock); 1089 return (0); 1090 } 1091 1092 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 1093 if (error == EPASSTHROUGH) 1094 error = ttioctl(tp, cmd, data, flag, l); 1095 if (error == EPASSTHROUGH) { 1096 if (pti->pt_flags & PF_UCNTL && 1097 (cmd & ~0xff) == UIOCCMD(0)) { 1098 if (cmd & 0xff) { 1099 pti->pt_ucntl = (u_char)cmd; 1100 ptcwakeup(tp, FREAD); 1101 } 1102 return (0); 1103 } 1104 } 1105 /* 1106 * If external processing and packet mode send ioctl packet. 1107 */ 1108 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 1109 switch(cmd) { 1110 case TIOCSETA: 1111 case TIOCSETAW: 1112 case TIOCSETAF: 1113 case TIOCSETP: 1114 case TIOCSETN: 1115 case TIOCSETC: 1116 case TIOCSLTC: 1117 case TIOCLBIS: 1118 case TIOCLBIC: 1119 case TIOCLSET: 1120 pti->pt_send |= TIOCPKT_IOCTL; 1121 ptcwakeup(tp, FREAD); 1122 default: 1123 break; 1124 } 1125 } 1126 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 1127 && CCEQ(cc[VSTART], CTRL('q')); 1128 if (pti->pt_flags & PF_NOSTOP) { 1129 if (stop) { 1130 pti->pt_send &= ~TIOCPKT_NOSTOP; 1131 pti->pt_send |= TIOCPKT_DOSTOP; 1132 pti->pt_flags &= ~PF_NOSTOP; 1133 ptcwakeup(tp, FREAD); 1134 } 1135 } else { 1136 if (!stop) { 1137 pti->pt_send &= ~TIOCPKT_DOSTOP; 1138 pti->pt_send |= TIOCPKT_NOSTOP; 1139 pti->pt_flags |= PF_NOSTOP; 1140 ptcwakeup(tp, FREAD); 1141 } 1142 } 1143 return (error); 1144 } 1145