1 /* $NetBSD: tty_pty.c,v 1.102 2007/11/07 15:56:22 ad 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 1.102 2007/11/07 15:56:22 ad Exp $"); 41 42 #include "opt_compat_sunos.h" 43 #include "opt_ptm.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/ioctl.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 MALLOC(pti, struct pt_softc *, sizeof(struct pt_softc), 234 M_DEVBUF, M_WAITOK); 235 memset(pti, 0, sizeof(struct pt_softc)); 236 237 pti->pt_tty = ttymalloc(); 238 239 mutex_enter(&pt_softc_mutex); 240 241 /* 242 * Check the entry again - it might have been 243 * added while we were waiting for mutex. 244 */ 245 if (!pt_softc[ptn]) { 246 tty_attach(pti->pt_tty); 247 pt_softc[ptn] = pti; 248 } else { 249 ttyfree(pti->pt_tty); 250 free(pti, M_DEVBUF); 251 } 252 253 mutex_exit(&pt_softc_mutex); 254 } 255 256 return (0); 257 } 258 259 /* 260 * Set maxpty in thread-safe way. Returns 0 in case of error, otherwise 261 * new value of maxptys. 262 */ 263 int 264 pty_maxptys(newmax, set) 265 int newmax, set; 266 { 267 if (!set) 268 return (maxptys); 269 270 /* 271 * We have to grab the pt_softc lock, so that we would pick correct 272 * value of npty (might be modified in pty_check()). 273 */ 274 mutex_enter(&pt_softc_mutex); 275 276 /* 277 * The value cannot be set to value lower than the highest pty 278 * number ever allocated. 279 */ 280 if (newmax >= npty) 281 maxptys = newmax; 282 else 283 newmax = 0; 284 285 mutex_exit(&pt_softc_mutex); 286 287 return newmax; 288 } 289 290 /* 291 * Establish n (or default if n is 1) ptys in the system. 292 */ 293 void 294 ptyattach(n) 295 int n; 296 { 297 298 mutex_init(&pt_softc_mutex, MUTEX_DEFAULT, IPL_NONE); 299 300 /* maybe should allow 0 => none? */ 301 if (n <= 1) 302 n = DEFAULT_NPTYS; 303 pt_softc = ptyarralloc(n); 304 npty = n; 305 #ifndef NO_DEV_PTM 306 ptmattach(1); 307 #endif 308 } 309 310 /*ARGSUSED*/ 311 int 312 ptsopen(dev_t dev, int flag, int devtype, struct lwp *l) 313 { 314 struct pt_softc *pti; 315 struct tty *tp; 316 int error; 317 int ptn = minor(dev); 318 319 if ((error = pty_check(ptn)) != 0) 320 return (error); 321 322 pti = pt_softc[ptn]; 323 tp = pti->pt_tty; 324 325 if (!ISSET(tp->t_state, TS_ISOPEN)) { 326 ttychars(tp); /* Set up default chars */ 327 tp->t_iflag = TTYDEF_IFLAG; 328 tp->t_oflag = TTYDEF_OFLAG; 329 tp->t_lflag = TTYDEF_LFLAG; 330 tp->t_cflag = TTYDEF_CFLAG; 331 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 332 ttsetwater(tp); /* would be done in xxparam() */ 333 } else if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, 334 tp) != 0) 335 return (EBUSY); 336 if (tp->t_oproc) /* Ctrlr still around. */ 337 SET(tp->t_state, TS_CARR_ON); 338 339 if (!ISSET(flag, O_NONBLOCK)) { 340 mutex_spin_enter(&tty_lock); 341 while (!ISSET(tp->t_state, TS_CARR_ON)) { 342 tp->t_wopen++; 343 error = ttysleep(tp, &tp->t_rawq.c_cv, true, 0); 344 tp->t_wopen--; 345 if (error) { 346 mutex_spin_exit(&tty_lock); 347 return (error); 348 } 349 } 350 mutex_spin_exit(&tty_lock); 351 } 352 error = (*tp->t_linesw->l_open)(dev, tp); 353 ptcwakeup(tp, FREAD|FWRITE); 354 return (error); 355 } 356 357 int 358 ptsclose(dev_t dev, int flag, int mode, struct lwp *l) 359 { 360 struct pt_softc *pti = pt_softc[minor(dev)]; 361 struct tty *tp = pti->pt_tty; 362 int error; 363 364 error = (*tp->t_linesw->l_close)(tp, flag); 365 error |= ttyclose(tp); 366 ptcwakeup(tp, FREAD|FWRITE); 367 return (error); 368 } 369 370 int 371 ptsread(dev, uio, flag) 372 dev_t dev; 373 struct uio *uio; 374 int flag; 375 { 376 struct proc *p = curproc; 377 struct pt_softc *pti = pt_softc[minor(dev)]; 378 struct tty *tp = pti->pt_tty; 379 int error = 0; 380 int cc; 381 382 again: 383 if (pti->pt_flags & PF_REMOTE) { 384 while (isbackground(p, tp)) { /* XXXSMP */ 385 if (sigismasked(curlwp, SIGTTIN) || 386 p->p_pgrp->pg_jobc == 0 || 387 p->p_flag & PS_PPWAIT) 388 return (EIO); 389 mutex_spin_enter(&tty_lock); 390 ttysig(tp, TTYSIG_PG1, SIGTTIN); 391 error = ttysleep(tp, &lbolt, true, 0); 392 mutex_spin_exit(&tty_lock); 393 if (error) 394 return (error); 395 } 396 mutex_spin_enter(&tty_lock); 397 if (tp->t_canq.c_cc == 0) { 398 if (flag & IO_NDELAY) { 399 mutex_spin_exit(&tty_lock); 400 return (EWOULDBLOCK); 401 } 402 error = ttysleep(tp, &tp->t_canq.c_cv, true, 0); 403 mutex_spin_exit(&tty_lock); 404 if (error) 405 return (error); 406 goto again; 407 } 408 while(error == 0 && tp->t_canq.c_cc > 1 && uio->uio_resid > 0) { 409 mutex_spin_exit(&tty_lock); 410 error = ureadc(getc(&tp->t_canq), uio); 411 mutex_spin_enter(&tty_lock); 412 /* Re-check terminal state here? */ 413 } 414 if (tp->t_canq.c_cc == 1) 415 (void) getc(&tp->t_canq); 416 cc = tp->t_canq.c_cc; 417 mutex_spin_exit(&tty_lock); 418 if (cc) 419 return (error); 420 } else 421 if (tp->t_oproc) 422 error = (*tp->t_linesw->l_read)(tp, uio, flag); 423 ptcwakeup(tp, FWRITE); 424 return (error); 425 } 426 427 /* 428 * Write to pseudo-tty. 429 * Wakeups of controlling tty will happen 430 * indirectly, when tty driver calls ptsstart. 431 */ 432 int 433 ptswrite(dev, uio, flag) 434 dev_t dev; 435 struct uio *uio; 436 int flag; 437 { 438 struct pt_softc *pti = pt_softc[minor(dev)]; 439 struct tty *tp = pti->pt_tty; 440 441 if (tp->t_oproc == 0) 442 return (EIO); 443 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 444 } 445 446 /* 447 * Poll pseudo-tty. 448 */ 449 int 450 ptspoll(dev, events, l) 451 dev_t dev; 452 int events; 453 struct lwp *l; 454 { 455 struct pt_softc *pti = pt_softc[minor(dev)]; 456 struct tty *tp = pti->pt_tty; 457 458 if (tp->t_oproc == 0) 459 return (POLLHUP); 460 461 return ((*tp->t_linesw->l_poll)(tp, events, l)); 462 } 463 464 /* 465 * Start output on pseudo-tty. 466 * Wake up process polling or sleeping for input from controlling tty. 467 * Called with tty lock held. 468 */ 469 void 470 ptsstart(tp) 471 struct tty *tp; 472 { 473 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 474 475 if (ISSET(tp->t_state, TS_TTSTOP)) 476 return; 477 if (pti->pt_flags & PF_STOPPED) { 478 pti->pt_flags &= ~PF_STOPPED; 479 pti->pt_send = TIOCPKT_START; 480 } 481 482 selnotify(&pti->pt_selr, NOTE_SUBMIT); 483 cv_broadcast(&tp->t_outq.c_cvf); 484 } 485 486 /* 487 * Stop output. 488 * Called with tty lock held. 489 */ 490 void 491 ptsstop(tp, flush) 492 struct tty *tp; 493 int flush; 494 { 495 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 496 497 /* note: FLUSHREAD and FLUSHWRITE already ok */ 498 if (flush == 0) { 499 flush = TIOCPKT_STOP; 500 pti->pt_flags |= PF_STOPPED; 501 } else 502 pti->pt_flags &= ~PF_STOPPED; 503 pti->pt_send |= flush; 504 505 /* change of perspective */ 506 if (flush & FREAD) { 507 selnotify(&pti->pt_selw, NOTE_SUBMIT); 508 cv_broadcast(&tp->t_rawq.c_cvf); 509 } 510 if (flush & FWRITE) { 511 selnotify(&pti->pt_selr, NOTE_SUBMIT); 512 cv_broadcast(&tp->t_outq.c_cvf); 513 } 514 } 515 516 void 517 ptcwakeup(tp, flag) 518 struct tty *tp; 519 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, NOTE_SUBMIT); 526 cv_broadcast(&tp->t_outq.c_cvf); 527 } 528 if (flag & FWRITE) { 529 selnotify(&pti->pt_selw, NOTE_SUBMIT); 530 cv_broadcast(&tp->t_rawq.c_cvf); 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 CLR(tp->t_state, TS_CARR_ON); 574 mutex_spin_enter(&tty_lock); 575 tp->t_oproc = 0; /* mark closed */ 576 mutex_spin_exit(&tty_lock); 577 return (0); 578 } 579 580 int 581 ptcread(dev, uio, flag) 582 dev_t dev; 583 struct uio *uio; 584 int flag; 585 { 586 struct pt_softc *pti = pt_softc[minor(dev)]; 587 struct tty *tp = pti->pt_tty; 588 u_char bf[BUFSIZ]; 589 int error = 0, cc; 590 591 /* 592 * We want to block until the slave 593 * is open, and there's something to read; 594 * but if we lost the slave or we're NBIO, 595 * then return the appropriate error instead. 596 */ 597 mutex_spin_enter(&tty_lock); 598 for (;;) { 599 if (ISSET(tp->t_state, TS_ISOPEN)) { 600 if (pti->pt_flags & PF_PKT && pti->pt_send) { 601 mutex_spin_exit(&tty_lock); 602 error = ureadc((int)pti->pt_send, uio); 603 if (error) 604 return (error); 605 /* 606 * Since we don't have the tty locked, there's 607 * a risk of messing up `t_termios'. This is 608 * relevant only if the tty got closed and then 609 * opened again while we were out uiomoving. 610 */ 611 if (pti->pt_send & TIOCPKT_IOCTL) { 612 cc = min(uio->uio_resid, 613 sizeof(tp->t_termios)); 614 uiomove((void *) &tp->t_termios, 615 cc, uio); 616 } 617 pti->pt_send = 0; 618 return (0); 619 } 620 if (pti->pt_flags & PF_UCNTL && pti->pt_ucntl) { 621 mutex_spin_exit(&tty_lock); 622 error = ureadc((int)pti->pt_ucntl, uio); 623 if (error) 624 return (error); 625 pti->pt_ucntl = 0; 626 return (0); 627 } 628 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 629 break; 630 } 631 if (!ISSET(tp->t_state, TS_CARR_ON)) { 632 error = 0; /* EOF */ 633 goto out; 634 } 635 if (flag & IO_NDELAY) { 636 error = EWOULDBLOCK; 637 goto out; 638 } 639 error = cv_wait_sig(&tp->t_outq.c_cvf, &tty_lock); 640 if (error) 641 goto out; 642 } 643 644 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) { 645 mutex_spin_exit(&tty_lock); 646 error = ureadc(0, uio); 647 mutex_spin_enter(&tty_lock); 648 if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) 649 error = EIO; 650 } 651 while (uio->uio_resid > 0 && error == 0) { 652 cc = q_to_b(&tp->t_outq, bf, min(uio->uio_resid, BUFSIZ)); 653 if (cc <= 0) 654 break; 655 mutex_spin_exit(&tty_lock); 656 error = uiomove(bf, cc, uio); 657 mutex_spin_enter(&tty_lock); 658 if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) 659 error = EIO; 660 } 661 662 if (tp->t_outq.c_cc <= tp->t_lowat) { 663 if (ISSET(tp->t_state, TS_ASLEEP)) { 664 CLR(tp->t_state, TS_ASLEEP); 665 cv_broadcast(&tp->t_outq.c_cv); 666 } 667 selnotify(&tp->t_wsel, NOTE_SUBMIT); 668 } 669 out: 670 mutex_spin_exit(&tty_lock); 671 return (error); 672 } 673 674 675 int 676 ptcwrite(dev, uio, flag) 677 dev_t dev; 678 struct uio *uio; 679 int flag; 680 { 681 struct pt_softc *pti = pt_softc[minor(dev)]; 682 struct tty *tp = pti->pt_tty; 683 u_char *cp = NULL; 684 int cc = 0; 685 u_char locbuf[BUFSIZ]; 686 int cnt = 0; 687 int error = 0; 688 689 again: 690 mutex_spin_enter(&tty_lock); 691 if (!ISSET(tp->t_state, TS_ISOPEN)) 692 goto block; 693 if (pti->pt_flags & PF_REMOTE) { 694 if (tp->t_canq.c_cc) 695 goto block; 696 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 697 if (cc == 0) { 698 cc = min(uio->uio_resid, BUFSIZ); 699 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 700 cp = locbuf; 701 mutex_spin_exit(&tty_lock); 702 error = uiomove((void *)cp, cc, uio); 703 if (error) 704 return (error); 705 mutex_spin_enter(&tty_lock); 706 /* check again for safety */ 707 if (!ISSET(tp->t_state, TS_ISOPEN)) { 708 /* 709 * adjust for data copied in but not 710 * written 711 */ 712 uio->uio_resid += cc; 713 error = EIO; 714 goto out; 715 } 716 } 717 if (cc) 718 (void) b_to_q(cp, cc, &tp->t_canq); 719 cc = 0; 720 } 721 (void) putc(0, &tp->t_canq); 722 ttwakeup(tp); 723 cv_broadcast(&tp->t_canq.c_cv); 724 error = 0; 725 goto out; 726 } 727 while (uio->uio_resid > 0) { 728 if (cc == 0) { 729 cc = min(uio->uio_resid, BUFSIZ); 730 cp = locbuf; 731 mutex_spin_exit(&tty_lock); 732 error = uiomove((void *)cp, cc, uio); 733 if (error) 734 return (error); 735 mutex_spin_enter(&tty_lock); 736 /* check again for safety */ 737 if (!ISSET(tp->t_state, TS_ISOPEN)) { 738 /* adjust for data copied in but not written */ 739 uio->uio_resid += cc; 740 error = EIO; 741 goto out; 742 } 743 } 744 while (cc > 0) { 745 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 746 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_lflag, ICANON))) { 747 cv_broadcast(&tp->t_rawq.c_cv); 748 goto block; 749 } 750 /* XXX - should change l_rint to be called with lock 751 * see also tty.c:ttyinput_wlock() 752 */ 753 mutex_spin_exit(&tty_lock); 754 (*tp->t_linesw->l_rint)(*cp++, tp); 755 mutex_spin_enter(&tty_lock); 756 cnt++; 757 cc--; 758 } 759 cc = 0; 760 } 761 error = 0; 762 goto out; 763 764 block: 765 /* 766 * Come here to wait for slave to open, for space 767 * in outq, or space in rawq. 768 */ 769 if (!ISSET(tp->t_state, TS_CARR_ON)) { 770 /* adjust for data copied in but not written */ 771 uio->uio_resid += cc; 772 error = EIO; 773 goto out; 774 } 775 if (flag & IO_NDELAY) { 776 /* adjust for data copied in but not written */ 777 uio->uio_resid += cc; 778 error = cnt == 0 ? EWOULDBLOCK : 0; 779 goto out; 780 } 781 error = cv_wait_sig(&tp->t_rawq.c_cv, &tty_lock); 782 mutex_spin_exit(&tty_lock); 783 if (error) { 784 /* adjust for data copied in but not written */ 785 uio->uio_resid += cc; 786 return (error); 787 } 788 goto again; 789 790 out: 791 mutex_spin_exit(&tty_lock); 792 return (error); 793 } 794 795 int 796 ptcpoll(dev, events, l) 797 dev_t dev; 798 int events; 799 struct lwp *l; 800 { 801 struct pt_softc *pti = pt_softc[minor(dev)]; 802 struct tty *tp = pti->pt_tty; 803 int revents = 0; 804 805 mutex_spin_enter(&tty_lock); 806 807 if (events & (POLLIN | POLLRDNORM)) 808 if (ISSET(tp->t_state, TS_ISOPEN) && 809 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 810 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 811 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 812 revents |= events & (POLLIN | POLLRDNORM); 813 814 if (events & (POLLOUT | POLLWRNORM)) 815 if (ISSET(tp->t_state, TS_ISOPEN) && 816 ((pti->pt_flags & PF_REMOTE) ? 817 (tp->t_canq.c_cc == 0) : 818 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 819 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))) 820 revents |= events & (POLLOUT | POLLWRNORM); 821 822 if (events & POLLHUP) 823 if (!ISSET(tp->t_state, TS_CARR_ON)) 824 revents |= POLLHUP; 825 826 if (revents == 0) { 827 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 828 selrecord(l, &pti->pt_selr); 829 830 if (events & (POLLOUT | POLLWRNORM)) 831 selrecord(l, &pti->pt_selw); 832 } 833 834 mutex_spin_exit(&tty_lock); 835 836 return (revents); 837 } 838 839 static void 840 filt_ptcrdetach(struct knote *kn) 841 { 842 struct pt_softc *pti; 843 struct tty *tp; 844 845 pti = kn->kn_hook; 846 tp = pti->pt_tty; 847 848 mutex_spin_enter(&tty_lock); 849 SLIST_REMOVE(&pti->pt_selr.sel_klist, kn, knote, kn_selnext); 850 mutex_spin_exit(&tty_lock); 851 } 852 853 static int 854 filt_ptcread(struct knote *kn, long hint) 855 { 856 struct pt_softc *pti; 857 struct tty *tp; 858 int canread; 859 860 pti = kn->kn_hook; 861 tp = pti->pt_tty; 862 863 mutex_spin_enter(&tty_lock); 864 865 canread = (ISSET(tp->t_state, TS_ISOPEN) && 866 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 867 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 868 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))); 869 870 if (canread) { 871 /* 872 * c_cc is number of characters after output post-processing; 873 * the amount of data actually read(2) depends on 874 * setting of input flags for the terminal. 875 */ 876 kn->kn_data = tp->t_outq.c_cc; 877 if (((pti->pt_flags & PF_PKT) && pti->pt_send) || 878 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)) 879 kn->kn_data++; 880 } 881 882 mutex_spin_exit(&tty_lock); 883 884 return (canread); 885 } 886 887 static void 888 filt_ptcwdetach(struct knote *kn) 889 { 890 struct pt_softc *pti; 891 struct tty *tp; 892 893 pti = kn->kn_hook; 894 tp = pti->pt_tty; 895 896 mutex_spin_enter(&tty_lock); 897 SLIST_REMOVE(&pti->pt_selw.sel_klist, kn, knote, kn_selnext); 898 mutex_spin_exit(&tty_lock); 899 } 900 901 static int 902 filt_ptcwrite(struct knote *kn, long hint) 903 { 904 struct pt_softc *pti; 905 struct tty *tp; 906 int canwrite; 907 int nwrite; 908 909 pti = kn->kn_hook; 910 tp = pti->pt_tty; 911 912 mutex_spin_enter(&tty_lock); 913 914 canwrite = (ISSET(tp->t_state, TS_ISOPEN) && 915 ((pti->pt_flags & PF_REMOTE) ? 916 (tp->t_canq.c_cc == 0) : 917 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 918 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))); 919 920 if (canwrite) { 921 if (pti->pt_flags & PF_REMOTE) 922 nwrite = tp->t_canq.c_cn; 923 else { 924 /* this is guaranteed to be > 0 due to above check */ 925 nwrite = tp->t_canq.c_cn 926 - (tp->t_rawq.c_cc + tp->t_canq.c_cc); 927 } 928 kn->kn_data = nwrite; 929 } 930 931 mutex_spin_exit(&tty_lock); 932 933 return (canwrite); 934 } 935 936 static const struct filterops ptcread_filtops = 937 { 1, NULL, filt_ptcrdetach, filt_ptcread }; 938 static const struct filterops ptcwrite_filtops = 939 { 1, NULL, filt_ptcwdetach, filt_ptcwrite }; 940 941 int 942 ptckqfilter(dev_t dev, struct knote *kn) 943 { 944 struct pt_softc *pti = pt_softc[minor(dev)]; 945 struct klist *klist; 946 947 switch (kn->kn_filter) { 948 case EVFILT_READ: 949 klist = &pti->pt_selr.sel_klist; 950 kn->kn_fop = &ptcread_filtops; 951 break; 952 case EVFILT_WRITE: 953 klist = &pti->pt_selw.sel_klist; 954 kn->kn_fop = &ptcwrite_filtops; 955 break; 956 default: 957 return (1); 958 } 959 960 kn->kn_hook = pti; 961 962 mutex_spin_enter(&tty_lock); 963 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 964 mutex_spin_exit(&tty_lock); 965 966 return (0); 967 } 968 969 struct tty * 970 ptytty(dev) 971 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, cmd, data, flag, l) 982 dev_t dev; 983 u_long cmd; 984 void *data; 985 int flag; 986 struct lwp *l; 987 { 988 struct pt_softc *pti = pt_softc[minor(dev)]; 989 struct tty *tp = pti->pt_tty; 990 const struct cdevsw *cdev; 991 u_char *cc = tp->t_cc; 992 int stop, error, sig; 993 994 /* 995 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 996 * ttywflush(tp) will hang if there are characters in the outq. 997 */ 998 if (cmd == TIOCEXT) { 999 /* 1000 * When the EXTPROC bit is being toggled, we need 1001 * to send an TIOCPKT_IOCTL if the packet driver 1002 * is turned on. 1003 */ 1004 if (*(int *)data) { 1005 if (pti->pt_flags & PF_PKT) { 1006 pti->pt_send |= TIOCPKT_IOCTL; 1007 ptcwakeup(tp, FREAD); 1008 } 1009 SET(tp->t_lflag, EXTPROC); 1010 } else { 1011 if (ISSET(tp->t_lflag, EXTPROC) && 1012 (pti->pt_flags & PF_PKT)) { 1013 pti->pt_send |= TIOCPKT_IOCTL; 1014 ptcwakeup(tp, FREAD); 1015 } 1016 CLR(tp->t_lflag, EXTPROC); 1017 } 1018 return(0); 1019 } 1020 1021 #ifndef NO_DEV_PTM 1022 /* Allow getting the name from either the master or the slave */ 1023 if (cmd == TIOCPTSNAME) 1024 return pty_fill_ptmget(l, dev, -1, -1, data); 1025 #endif 1026 1027 cdev = cdevsw_lookup(dev); 1028 if (cdev != NULL && cdev->d_open == ptcopen) 1029 switch (cmd) { 1030 #ifndef NO_DEV_PTM 1031 case TIOCGRANTPT: 1032 return pty_grant_slave(l, dev); 1033 #endif 1034 1035 case TIOCGPGRP: 1036 /* 1037 * We avoid calling ttioctl on the controller since, 1038 * in that case, tp must be the controlling terminal. 1039 */ 1040 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1041 return (0); 1042 1043 case TIOCPKT: 1044 if (*(int *)data) { 1045 if (pti->pt_flags & PF_UCNTL) 1046 return (EINVAL); 1047 pti->pt_flags |= PF_PKT; 1048 } else 1049 pti->pt_flags &= ~PF_PKT; 1050 return (0); 1051 1052 case TIOCUCNTL: 1053 if (*(int *)data) { 1054 if (pti->pt_flags & PF_PKT) 1055 return (EINVAL); 1056 pti->pt_flags |= PF_UCNTL; 1057 } else 1058 pti->pt_flags &= ~PF_UCNTL; 1059 return (0); 1060 1061 case TIOCREMOTE: 1062 if (*(int *)data) 1063 pti->pt_flags |= PF_REMOTE; 1064 else 1065 pti->pt_flags &= ~PF_REMOTE; 1066 mutex_spin_enter(&tty_lock); 1067 ttyflush(tp, FREAD|FWRITE); 1068 mutex_spin_exit(&tty_lock); 1069 return (0); 1070 1071 #ifdef COMPAT_OLDTTY 1072 case TIOCSETP: 1073 case TIOCSETN: 1074 #endif 1075 case TIOCSETD: 1076 case TIOCSETA: 1077 case TIOCSETAW: 1078 case TIOCSETAF: 1079 mutex_spin_enter(&tty_lock); 1080 ndflush(&tp->t_outq, tp->t_outq.c_cc); 1081 mutex_spin_exit(&tty_lock); 1082 break; 1083 1084 case TIOCSIG: 1085 sig = (int)(long)*(void **)data; 1086 if (sig <= 0 || sig >= NSIG) 1087 return (EINVAL); 1088 mutex_spin_enter(&tty_lock); 1089 if (!ISSET(tp->t_lflag, NOFLSH)) 1090 ttyflush(tp, FREAD|FWRITE); 1091 if ((sig == SIGINFO) && 1092 (!ISSET(tp->t_lflag, NOKERNINFO))) 1093 ttyinfo(tp, 1); 1094 ttysig(tp, TTYSIG_PG1, sig); 1095 mutex_spin_exit(&tty_lock); 1096 return(0); 1097 } 1098 1099 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 1100 if (error == EPASSTHROUGH) 1101 error = ttioctl(tp, cmd, data, flag, l); 1102 if (error == EPASSTHROUGH) { 1103 if (pti->pt_flags & PF_UCNTL && 1104 (cmd & ~0xff) == UIOCCMD(0)) { 1105 if (cmd & 0xff) { 1106 pti->pt_ucntl = (u_char)cmd; 1107 ptcwakeup(tp, FREAD); 1108 } 1109 return (0); 1110 } 1111 } 1112 /* 1113 * If external processing and packet mode send ioctl packet. 1114 */ 1115 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 1116 switch(cmd) { 1117 case TIOCSETA: 1118 case TIOCSETAW: 1119 case TIOCSETAF: 1120 #ifdef COMPAT_OLDTTY 1121 case TIOCSETP: 1122 case TIOCSETN: 1123 case TIOCSETC: 1124 case TIOCSLTC: 1125 case TIOCLBIS: 1126 case TIOCLBIC: 1127 case TIOCLSET: 1128 #endif 1129 pti->pt_send |= TIOCPKT_IOCTL; 1130 ptcwakeup(tp, FREAD); 1131 default: 1132 break; 1133 } 1134 } 1135 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 1136 && CCEQ(cc[VSTART], CTRL('q')); 1137 if (pti->pt_flags & PF_NOSTOP) { 1138 if (stop) { 1139 pti->pt_send &= ~TIOCPKT_NOSTOP; 1140 pti->pt_send |= TIOCPKT_DOSTOP; 1141 pti->pt_flags &= ~PF_NOSTOP; 1142 ptcwakeup(tp, FREAD); 1143 } 1144 } else { 1145 if (!stop) { 1146 pti->pt_send &= ~TIOCPKT_DOSTOP; 1147 pti->pt_send |= TIOCPKT_NOSTOP; 1148 pti->pt_flags |= PF_NOSTOP; 1149 ptcwakeup(tp, FREAD); 1150 } 1151 } 1152 return (error); 1153 } 1154