1 /* $NetBSD: tty_pty.c,v 1.80 2004/06/18 15:02:53 christos 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 * Additional multiplexor driver /dev/ptm{,x} 38 */ 39 40 #include <sys/cdefs.h> 41 __KERNEL_RCSID(0, "$NetBSD: tty_pty.c,v 1.80 2004/06/18 15:02:53 christos Exp $"); 42 43 #include "opt_compat_sunos.h" 44 #include "opt_ptm.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/ioctl.h> 49 #include <sys/proc.h> 50 #include <sys/tty.h> 51 #include <sys/stat.h> 52 #include <sys/file.h> 53 #include <sys/uio.h> 54 #include <sys/kernel.h> 55 #include <sys/vnode.h> 56 #include <sys/namei.h> 57 #include <sys/signalvar.h> 58 #include <sys/uio.h> 59 #include <sys/filedesc.h> 60 #include <sys/conf.h> 61 #include <sys/poll.h> 62 #include <sys/malloc.h> 63 64 #define DEFAULT_NPTYS 16 /* default number of initial ptys */ 65 #define DEFAULT_MAXPTYS 992 /* default maximum number of ptys */ 66 67 #ifdef DEBUG_PTM 68 #define DPRINTF(a) uprintf a 69 #else 70 #define DPRINTF(a) 71 #endif 72 73 /* Macros to clear/set/test flags. */ 74 #define SET(t, f) (t) |= (f) 75 #define CLR(t, f) (t) &= ~((unsigned)(f)) 76 #define ISSET(t, f) ((t) & (f)) 77 78 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 79 80 /* 81 * pts == /dev/tty[pqrs]? 82 * ptc == /dev/pty[pqrs]? 83 */ 84 85 #define TTY_TEMPLATE "/dev/XtyXX" 86 #define TTY_NAMESIZE sizeof(TTY_TEMPLATE) 87 /* XXX this needs to come from somewhere sane, and work with MAKEDEV */ 88 #define TTY_LETTERS "pqrstuvwxyzPQRST" 89 #define TTY_OLD_SUFFIX "0123456789abcdef" 90 #define TTY_NEW_SUFFIX "ghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" 91 92 struct pt_softc { 93 struct tty *pt_tty; 94 int pt_flags; 95 struct selinfo pt_selr, pt_selw; 96 u_char pt_send; 97 u_char pt_ucntl; 98 }; 99 100 static struct pt_softc **pt_softc = NULL; /* pty array */ 101 static int npty = 0; /* for pstat -t */ 102 static int maxptys = DEFAULT_MAXPTYS; /* maximum number of ptys (sysctable) */ 103 static struct simplelock pt_softc_mutex = SIMPLELOCK_INITIALIZER; 104 105 #define PF_PKT 0x08 /* packet mode */ 106 #define PF_STOPPED 0x10 /* user told stopped */ 107 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 108 #define PF_NOSTOP 0x40 109 #define PF_UCNTL 0x80 /* user control mode */ 110 111 void ptyattach(int); 112 void ptcwakeup(struct tty *, int); 113 void ptsstart(struct tty *); 114 int pty_maxptys(int, int); 115 116 static struct pt_softc **ptyarralloc(int); 117 static int check_pty(int); 118 119 #ifndef NO_DEV_PTM 120 121 static int pts_major; 122 123 static dev_t pty_getfree(void); 124 static char *pty_makename(char *, dev_t, char); 125 static int pty_grant_slave(struct proc *, dev_t); 126 static int pty_alloc_master(struct proc *, int *, dev_t *); 127 static int pty_alloc_slave(struct proc *, int *, dev_t); 128 static void pty_fill_ptmget(dev_t, int, int, void *); 129 130 void ptmattach(int); 131 132 dev_type_open(ptmopen); 133 dev_type_close(ptmclose); 134 dev_type_ioctl(ptmioctl); 135 136 const struct cdevsw ptm_cdevsw = { 137 ptmopen, ptmclose, noread, nowrite, ptmioctl, 138 nullstop, notty, nopoll, nommap, nokqfilter, D_TTY 139 }; 140 #else 141 const struct cdevsw ptm_cdevsw = { 142 noopen, noclose, noread, nowrite, noioctl, 143 nostop, notty, nopoll, nommap, nokqfilter, D_TTY 144 }; 145 #endif 146 147 dev_type_open(ptcopen); 148 dev_type_close(ptcclose); 149 dev_type_read(ptcread); 150 dev_type_write(ptcwrite); 151 dev_type_poll(ptcpoll); 152 dev_type_kqfilter(ptckqfilter); 153 154 dev_type_open(ptsopen); 155 dev_type_close(ptsclose); 156 dev_type_read(ptsread); 157 dev_type_write(ptswrite); 158 dev_type_stop(ptsstop); 159 dev_type_poll(ptspoll); 160 161 dev_type_ioctl(ptyioctl); 162 dev_type_tty(ptytty); 163 164 const struct cdevsw ptc_cdevsw = { 165 ptcopen, ptcclose, ptcread, ptcwrite, ptyioctl, 166 nullstop, ptytty, ptcpoll, nommap, ptckqfilter, D_TTY 167 }; 168 169 const struct cdevsw pts_cdevsw = { 170 ptsopen, ptsclose, ptsread, ptswrite, ptyioctl, 171 ptsstop, ptytty, ptspoll, nommap, ttykqfilter, D_TTY 172 }; 173 174 #if defined(pmax) 175 const struct cdevsw ptc_ultrix_cdevsw = { 176 ptcopen, ptcclose, ptcread, ptcwrite, ptyioctl, 177 nullstop, ptytty, ptcpoll, nommap, ptckqfilter, D_TTY 178 }; 179 180 const struct cdevsw pts_ultrix_cdevsw = { 181 ptsopen, ptsclose, ptsread, ptswrite, ptyioctl, 182 ptsstop, ptytty, ptspoll, nommap, ttykqfilter, D_TTY 183 }; 184 #endif /* defined(pmax) */ 185 186 /* 187 * Allocate and zero array of nelem elements. 188 */ 189 static struct pt_softc ** 190 ptyarralloc(nelem) 191 int nelem; 192 { 193 struct pt_softc **pt; 194 nelem += 10; 195 pt = malloc(nelem * sizeof *pt, M_DEVBUF, M_WAITOK | M_ZERO); 196 return pt; 197 } 198 199 /* 200 * Check if the minor is correct and ensure necessary structures 201 * are properly allocated. 202 */ 203 static int 204 check_pty(int ptn) 205 { 206 struct pt_softc *pti; 207 208 if (ptn >= npty) { 209 struct pt_softc **newpt, **oldpt; 210 int newnpty; 211 212 /* check if the requested pty can be granted */ 213 if (ptn >= maxptys) { 214 limit_reached: 215 tablefull("pty", "increase kern.maxptys"); 216 return (ENXIO); 217 } 218 219 /* Allocate a larger pty array */ 220 for (newnpty = npty; newnpty <= ptn;) 221 newnpty *= 2; 222 if (newnpty > maxptys) 223 newnpty = maxptys; 224 newpt = ptyarralloc(newnpty); 225 226 /* 227 * Now grab the pty array mutex - we need to ensure 228 * that the pty array is consistent while copying it's 229 * content to newly allocated, larger space; we also 230 * need to be safe against pty_maxptys(). 231 */ 232 simple_lock(&pt_softc_mutex); 233 234 if (newnpty >= maxptys) { 235 /* limit cut away beneath us... */ 236 newnpty = maxptys; 237 if (ptn >= newnpty) { 238 simple_unlock(&pt_softc_mutex); 239 free(newpt, M_DEVBUF); 240 goto limit_reached; 241 } 242 } 243 244 /* 245 * If the pty array was not enlarged while we were waiting 246 * for mutex, copy current contents of pt_softc[] to newly 247 * allocated array and start using the new bigger array. 248 */ 249 if (newnpty > npty) { 250 memcpy(newpt, pt_softc, npty*sizeof(struct pt_softc *)); 251 oldpt = pt_softc; 252 pt_softc = newpt; 253 npty = newnpty; 254 } else { 255 /* was enlarged when waited for lock, free new space */ 256 oldpt = newpt; 257 } 258 259 simple_unlock(&pt_softc_mutex); 260 free(oldpt, M_DEVBUF); 261 } 262 263 /* 264 * If the entry is not yet allocated, allocate one. The mutex is 265 * needed so that the state of pt_softc[] array is consistant 266 * in case it has been lengthened above. 267 */ 268 if (!pt_softc[ptn]) { 269 MALLOC(pti, struct pt_softc *, sizeof(struct pt_softc), 270 M_DEVBUF, M_WAITOK); 271 memset(pti, 0, sizeof(struct pt_softc)); 272 273 pti->pt_tty = ttymalloc(); 274 275 simple_lock(&pt_softc_mutex); 276 277 /* 278 * Check the entry again - it might have been 279 * added while we were waiting for mutex. 280 */ 281 if (!pt_softc[ptn]) { 282 tty_attach(pti->pt_tty); 283 pt_softc[ptn] = pti; 284 } else { 285 ttyfree(pti->pt_tty); 286 free(pti, M_DEVBUF); 287 } 288 289 simple_unlock(&pt_softc_mutex); 290 } 291 292 return (0); 293 } 294 295 /* 296 * Set maxpty in thread-safe way. Returns 0 in case of error, otherwise 297 * new value of maxptys. 298 */ 299 int 300 pty_maxptys(newmax, set) 301 int newmax, set; 302 { 303 if (!set) 304 return (maxptys); 305 306 /* 307 * We have to grab the pt_softc lock, so that we would pick correct 308 * value of npty (might be modified in check_pty()). 309 */ 310 simple_lock(&pt_softc_mutex); 311 312 /* 313 * The value cannot be set to value lower than the highest pty 314 * number ever allocated. 315 */ 316 if (newmax >= npty) 317 maxptys = newmax; 318 else 319 newmax = 0; 320 321 simple_unlock(&pt_softc_mutex); 322 323 return newmax; 324 } 325 326 /* 327 * Establish n (or default if n is 1) ptys in the system. 328 */ 329 void 330 ptyattach(n) 331 int n; 332 { 333 /* maybe should allow 0 => none? */ 334 if (n <= 1) 335 n = DEFAULT_NPTYS; 336 pt_softc = ptyarralloc(n); 337 npty = n; 338 #ifndef NO_DEV_PTM 339 ptmattach(1); 340 #endif 341 } 342 343 /*ARGSUSED*/ 344 int 345 ptsopen(dev, flag, devtype, p) 346 dev_t dev; 347 int flag, devtype; 348 struct proc *p; 349 { 350 struct pt_softc *pti; 351 struct tty *tp; 352 int error; 353 int ptn = minor(dev); 354 int s; 355 356 if ((error = check_pty(ptn))) 357 return (error); 358 359 pti = pt_softc[ptn]; 360 tp = pti->pt_tty; 361 362 if (!ISSET(tp->t_state, TS_ISOPEN)) { 363 ttychars(tp); /* Set up default chars */ 364 tp->t_iflag = TTYDEF_IFLAG; 365 tp->t_oflag = TTYDEF_OFLAG; 366 tp->t_lflag = TTYDEF_LFLAG; 367 tp->t_cflag = TTYDEF_CFLAG; 368 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 369 ttsetwater(tp); /* would be done in xxparam() */ 370 } else if (ISSET(tp->t_state, TS_XCLUDE) && p->p_ucred->cr_uid != 0) 371 return (EBUSY); 372 if (tp->t_oproc) /* Ctrlr still around. */ 373 SET(tp->t_state, TS_CARR_ON); 374 375 if (!ISSET(flag, O_NONBLOCK)) { 376 s = spltty(); 377 TTY_LOCK(tp); 378 while (!ISSET(tp->t_state, TS_CARR_ON)) { 379 tp->t_wopen++; 380 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, 381 ttopen, 0); 382 tp->t_wopen--; 383 if (error) { 384 TTY_UNLOCK(tp); 385 splx(s); 386 return (error); 387 } 388 } 389 TTY_UNLOCK(tp); 390 splx(s); 391 } 392 error = (*tp->t_linesw->l_open)(dev, tp); 393 ptcwakeup(tp, FREAD|FWRITE); 394 return (error); 395 } 396 397 int 398 ptsclose(dev, flag, mode, p) 399 dev_t dev; 400 int flag, mode; 401 struct proc *p; 402 { 403 struct pt_softc *pti = pt_softc[minor(dev)]; 404 struct tty *tp = pti->pt_tty; 405 int error; 406 407 error = (*tp->t_linesw->l_close)(tp, flag); 408 error |= ttyclose(tp); 409 ptcwakeup(tp, FREAD|FWRITE); 410 return (error); 411 } 412 413 int 414 ptsread(dev, uio, flag) 415 dev_t dev; 416 struct uio *uio; 417 int flag; 418 { 419 struct proc *p = curproc; 420 struct pt_softc *pti = pt_softc[minor(dev)]; 421 struct tty *tp = pti->pt_tty; 422 int error = 0; 423 int cc; 424 int s; 425 426 again: 427 if (pti->pt_flags & PF_REMOTE) { 428 while (isbackground(p, tp)) { 429 if (sigismasked(p, SIGTTIN) || 430 p->p_pgrp->pg_jobc == 0 || 431 p->p_flag & P_PPWAIT) 432 return (EIO); 433 pgsignal(p->p_pgrp, SIGTTIN, 1); 434 s = spltty(); 435 TTY_LOCK(tp); 436 error = ttysleep(tp, (caddr_t)&lbolt, 437 TTIPRI | PCATCH | PNORELOCK, ttybg, 0); 438 splx(s); 439 if (error) 440 return (error); 441 } 442 s = spltty(); 443 TTY_LOCK(tp); 444 if (tp->t_canq.c_cc == 0) { 445 if (flag & IO_NDELAY) { 446 TTY_UNLOCK(tp); 447 splx(s); 448 return (EWOULDBLOCK); 449 } 450 error = ttysleep(tp, (caddr_t)&tp->t_canq, 451 TTIPRI | PCATCH | PNORELOCK, ttyin, 0); 452 if (error) 453 return (error); 454 goto again; 455 } 456 while(error == 0 && tp->t_canq.c_cc > 1 && uio->uio_resid > 0) { 457 TTY_UNLOCK(tp); 458 splx(s); 459 error = ureadc(getc(&tp->t_canq), uio); 460 s = spltty(); 461 TTY_LOCK(tp); 462 /* Re-check terminal state here? */ 463 } 464 if (tp->t_canq.c_cc == 1) 465 (void) getc(&tp->t_canq); 466 cc = tp->t_canq.c_cc; 467 TTY_UNLOCK(tp); 468 splx(s); 469 if (cc) 470 return (error); 471 } else 472 if (tp->t_oproc) 473 error = (*tp->t_linesw->l_read)(tp, uio, flag); 474 ptcwakeup(tp, FWRITE); 475 return (error); 476 } 477 478 /* 479 * Write to pseudo-tty. 480 * Wakeups of controlling tty will happen 481 * indirectly, when tty driver calls ptsstart. 482 */ 483 int 484 ptswrite(dev, uio, flag) 485 dev_t dev; 486 struct uio *uio; 487 int flag; 488 { 489 struct pt_softc *pti = pt_softc[minor(dev)]; 490 struct tty *tp = pti->pt_tty; 491 492 if (tp->t_oproc == 0) 493 return (EIO); 494 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 495 } 496 497 /* 498 * Poll pseudo-tty. 499 */ 500 int 501 ptspoll(dev, events, p) 502 dev_t dev; 503 int events; 504 struct proc *p; 505 { 506 struct pt_softc *pti = pt_softc[minor(dev)]; 507 struct tty *tp = pti->pt_tty; 508 509 if (tp->t_oproc == 0) 510 return (EIO); 511 512 return ((*tp->t_linesw->l_poll)(tp, events, p)); 513 } 514 515 /* 516 * Start output on pseudo-tty. 517 * Wake up process polling or sleeping for input from controlling tty. 518 * Called with tty slock held. 519 */ 520 void 521 ptsstart(tp) 522 struct tty *tp; 523 { 524 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 525 526 if (ISSET(tp->t_state, TS_TTSTOP)) 527 return; 528 if (pti->pt_flags & PF_STOPPED) { 529 pti->pt_flags &= ~PF_STOPPED; 530 pti->pt_send = TIOCPKT_START; 531 } 532 533 selnotify(&pti->pt_selr, NOTE_SUBMIT); 534 wakeup((caddr_t)&tp->t_outq.c_cf); 535 } 536 537 /* 538 * Stop output. 539 * Called with tty slock held. 540 */ 541 void 542 ptsstop(tp, flush) 543 struct tty *tp; 544 int flush; 545 { 546 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 547 548 /* note: FLUSHREAD and FLUSHWRITE already ok */ 549 if (flush == 0) { 550 flush = TIOCPKT_STOP; 551 pti->pt_flags |= PF_STOPPED; 552 } else 553 pti->pt_flags &= ~PF_STOPPED; 554 pti->pt_send |= flush; 555 556 /* change of perspective */ 557 if (flush & FREAD) { 558 selnotify(&pti->pt_selw, NOTE_SUBMIT); 559 wakeup((caddr_t)&tp->t_rawq.c_cf); 560 } 561 if (flush & FWRITE) { 562 selnotify(&pti->pt_selr, NOTE_SUBMIT); 563 wakeup((caddr_t)&tp->t_outq.c_cf); 564 } 565 } 566 567 void 568 ptcwakeup(tp, flag) 569 struct tty *tp; 570 int flag; 571 { 572 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 573 int s; 574 575 s = spltty(); 576 TTY_LOCK(tp); 577 if (flag & FREAD) { 578 selnotify(&pti->pt_selr, NOTE_SUBMIT); 579 wakeup((caddr_t)&tp->t_outq.c_cf); 580 } 581 if (flag & FWRITE) { 582 selnotify(&pti->pt_selw, NOTE_SUBMIT); 583 wakeup((caddr_t)&tp->t_rawq.c_cf); 584 } 585 TTY_UNLOCK(tp); 586 splx(s); 587 } 588 589 /*ARGSUSED*/ 590 int 591 ptcopen(dev, flag, devtype, p) 592 dev_t dev; 593 int flag, devtype; 594 struct proc *p; 595 { 596 struct pt_softc *pti; 597 struct tty *tp; 598 int error; 599 int ptn = minor(dev); 600 int s; 601 602 if ((error = check_pty(ptn))) 603 return (error); 604 605 pti = pt_softc[ptn]; 606 tp = pti->pt_tty; 607 608 s = spltty(); 609 TTY_LOCK(tp); 610 if (tp->t_oproc) { 611 TTY_UNLOCK(tp); 612 splx(s); 613 return (EIO); 614 } 615 tp->t_oproc = ptsstart; 616 TTY_UNLOCK(tp); 617 splx(s); 618 (void)(*tp->t_linesw->l_modem)(tp, 1); 619 CLR(tp->t_lflag, EXTPROC); 620 pti->pt_flags = 0; 621 pti->pt_send = 0; 622 pti->pt_ucntl = 0; 623 return (0); 624 } 625 626 /*ARGSUSED*/ 627 int 628 ptcclose(dev, flag, devtype, p) 629 dev_t dev; 630 int flag, devtype; 631 struct proc *p; 632 { 633 struct pt_softc *pti = pt_softc[minor(dev)]; 634 struct tty *tp = pti->pt_tty; 635 int s; 636 637 (void)(*tp->t_linesw->l_modem)(tp, 0); 638 CLR(tp->t_state, TS_CARR_ON); 639 s = spltty(); 640 TTY_LOCK(tp); 641 tp->t_oproc = 0; /* mark closed */ 642 TTY_UNLOCK(tp); 643 splx(s); 644 return (0); 645 } 646 647 int 648 ptcread(dev, uio, flag) 649 dev_t dev; 650 struct uio *uio; 651 int flag; 652 { 653 struct pt_softc *pti = pt_softc[minor(dev)]; 654 struct tty *tp = pti->pt_tty; 655 u_char buf[BUFSIZ]; 656 int error = 0, cc; 657 int s; 658 659 /* 660 * We want to block until the slave 661 * is open, and there's something to read; 662 * but if we lost the slave or we're NBIO, 663 * then return the appropriate error instead. 664 */ 665 s = spltty(); 666 TTY_LOCK(tp); 667 for (;;) { 668 if (ISSET(tp->t_state, TS_ISOPEN)) { 669 if (pti->pt_flags & PF_PKT && pti->pt_send) { 670 TTY_UNLOCK(tp); 671 splx(s); 672 error = ureadc((int)pti->pt_send, uio); 673 if (error) 674 return (error); 675 /* 676 * Since we don't have the tty locked, there's 677 * a risk of messing up `t_termios'. This is 678 * relevant only if the tty got closed and then 679 * opened again while we were out uiomoving. 680 */ 681 if (pti->pt_send & TIOCPKT_IOCTL) { 682 cc = min(uio->uio_resid, 683 sizeof(tp->t_termios)); 684 uiomove((caddr_t) &tp->t_termios, 685 cc, uio); 686 } 687 pti->pt_send = 0; 688 return (0); 689 } 690 if (pti->pt_flags & PF_UCNTL && pti->pt_ucntl) { 691 TTY_UNLOCK(tp); 692 splx(s); 693 error = ureadc((int)pti->pt_ucntl, uio); 694 if (error) 695 return (error); 696 pti->pt_ucntl = 0; 697 return (0); 698 } 699 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 700 break; 701 } 702 if (!ISSET(tp->t_state, TS_CARR_ON)) { 703 error = 0; /* EOF */ 704 goto out; 705 } 706 if (flag & IO_NDELAY) { 707 error = EWOULDBLOCK; 708 goto out; 709 } 710 error = ltsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH, 711 ttyin, 0, &tp->t_slock); 712 if (error) 713 goto out; 714 } 715 716 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) { 717 TTY_UNLOCK(tp); 718 splx(s); 719 error = ureadc(0, uio); 720 s = spltty(); 721 TTY_LOCK(tp); 722 if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) 723 error = EIO; 724 } 725 while (uio->uio_resid > 0 && error == 0) { 726 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 727 if (cc <= 0) 728 break; 729 TTY_UNLOCK(tp); 730 splx(s); 731 error = uiomove(buf, cc, uio); 732 s = spltty(); 733 TTY_LOCK(tp); 734 if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) 735 error = EIO; 736 } 737 738 if (tp->t_outq.c_cc <= tp->t_lowat) { 739 if (ISSET(tp->t_state, TS_ASLEEP)) { 740 CLR(tp->t_state, TS_ASLEEP); 741 wakeup((caddr_t)&tp->t_outq); 742 } 743 selnotify(&tp->t_wsel, NOTE_SUBMIT); 744 } 745 out: 746 TTY_UNLOCK(tp); 747 splx(s); 748 return (error); 749 } 750 751 752 int 753 ptcwrite(dev, uio, flag) 754 dev_t dev; 755 struct uio *uio; 756 int flag; 757 { 758 struct pt_softc *pti = pt_softc[minor(dev)]; 759 struct tty *tp = pti->pt_tty; 760 u_char *cp = NULL; 761 int cc = 0; 762 u_char locbuf[BUFSIZ]; 763 int cnt = 0; 764 int error = 0; 765 int s; 766 767 again: 768 s = spltty(); 769 TTY_LOCK(tp); 770 if (!ISSET(tp->t_state, TS_ISOPEN)) 771 goto block; 772 if (pti->pt_flags & PF_REMOTE) { 773 if (tp->t_canq.c_cc) 774 goto block; 775 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 776 if (cc == 0) { 777 cc = min(uio->uio_resid, BUFSIZ); 778 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 779 cp = locbuf; 780 TTY_UNLOCK(tp); 781 splx(s); 782 error = uiomove((caddr_t)cp, cc, uio); 783 if (error) 784 return (error); 785 s = spltty(); 786 TTY_LOCK(tp); 787 /* check again for safety */ 788 if (!ISSET(tp->t_state, TS_ISOPEN)) { 789 error = EIO; 790 goto out; 791 } 792 } 793 if (cc) 794 (void) b_to_q(cp, cc, &tp->t_canq); 795 cc = 0; 796 } 797 (void) putc(0, &tp->t_canq); 798 ttwakeup(tp); 799 wakeup((caddr_t)&tp->t_canq); 800 error = 0; 801 goto out; 802 } 803 while (uio->uio_resid > 0) { 804 if (cc == 0) { 805 cc = min(uio->uio_resid, BUFSIZ); 806 cp = locbuf; 807 TTY_UNLOCK(tp); 808 splx(s); 809 error = uiomove((caddr_t)cp, cc, uio); 810 if (error) 811 return (error); 812 s = spltty(); 813 TTY_LOCK(tp); 814 /* check again for safety */ 815 if (!ISSET(tp->t_state, TS_ISOPEN)) { 816 error = EIO; 817 goto out; 818 } 819 } 820 while (cc > 0) { 821 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 822 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_lflag, ICANON))) { 823 wakeup((caddr_t)&tp->t_rawq); 824 goto block; 825 } 826 /* XXX - should change l_rint to be called with lock 827 * see also tty.c:ttyinput_wlock() 828 */ 829 TTY_UNLOCK(tp); 830 splx(s); 831 (*tp->t_linesw->l_rint)(*cp++, tp); 832 s = spltty(); 833 TTY_LOCK(tp); 834 cnt++; 835 cc--; 836 } 837 cc = 0; 838 } 839 error = 0; 840 goto out; 841 842 block: 843 /* 844 * Come here to wait for slave to open, for space 845 * in outq, or space in rawq. 846 */ 847 if (!ISSET(tp->t_state, TS_CARR_ON)) { 848 error = EIO; 849 goto out; 850 } 851 if (flag & IO_NDELAY) { 852 /* adjust for data copied in but not written */ 853 uio->uio_resid += cc; 854 error = cnt == 0 ? EWOULDBLOCK : 0; 855 goto out; 856 } 857 error = ltsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH | PNORELOCK, 858 ttyout, 0, &tp->t_slock); 859 splx(s); 860 if (error) { 861 /* adjust for data copied in but not written */ 862 uio->uio_resid += cc; 863 return (error); 864 } 865 goto again; 866 867 out: 868 TTY_UNLOCK(tp); 869 splx(s); 870 return (error); 871 } 872 873 int 874 ptcpoll(dev, events, p) 875 dev_t dev; 876 int events; 877 struct proc *p; 878 { 879 struct pt_softc *pti = pt_softc[minor(dev)]; 880 struct tty *tp = pti->pt_tty; 881 int revents = 0; 882 int s = splsoftclock(); 883 884 if (events & (POLLIN | POLLRDNORM)) 885 if (ISSET(tp->t_state, TS_ISOPEN) && 886 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 887 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 888 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 889 revents |= events & (POLLIN | POLLRDNORM); 890 891 if (events & (POLLOUT | POLLWRNORM)) 892 if (ISSET(tp->t_state, TS_ISOPEN) && 893 ((pti->pt_flags & PF_REMOTE) ? 894 (tp->t_canq.c_cc == 0) : 895 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 896 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))) 897 revents |= events & (POLLOUT | POLLWRNORM); 898 899 if (events & POLLHUP) 900 if (!ISSET(tp->t_state, TS_CARR_ON)) 901 revents |= POLLHUP; 902 903 if (revents == 0) { 904 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 905 selrecord(p, &pti->pt_selr); 906 907 if (events & (POLLOUT | POLLWRNORM)) 908 selrecord(p, &pti->pt_selw); 909 } 910 911 splx(s); 912 return (revents); 913 } 914 915 static void 916 filt_ptcrdetach(struct knote *kn) 917 { 918 struct pt_softc *pti; 919 int s; 920 921 pti = kn->kn_hook; 922 s = spltty(); 923 SLIST_REMOVE(&pti->pt_selr.sel_klist, kn, knote, kn_selnext); 924 splx(s); 925 } 926 927 static int 928 filt_ptcread(struct knote *kn, long hint) 929 { 930 struct pt_softc *pti; 931 struct tty *tp; 932 int canread; 933 934 pti = kn->kn_hook; 935 tp = pti->pt_tty; 936 937 canread = (ISSET(tp->t_state, TS_ISOPEN) && 938 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 939 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 940 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))); 941 942 if (canread) { 943 /* 944 * c_cc is number of characters after output post-processing; 945 * the amount of data actually read(2) depends on 946 * setting of input flags for the terminal. 947 */ 948 kn->kn_data = tp->t_outq.c_cc; 949 if (((pti->pt_flags & PF_PKT) && pti->pt_send) || 950 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)) 951 kn->kn_data++; 952 } 953 954 return (canread); 955 } 956 957 static void 958 filt_ptcwdetach(struct knote *kn) 959 { 960 struct pt_softc *pti; 961 int s; 962 963 pti = kn->kn_hook; 964 s = spltty(); 965 SLIST_REMOVE(&pti->pt_selw.sel_klist, kn, knote, kn_selnext); 966 splx(s); 967 } 968 969 static int 970 filt_ptcwrite(struct knote *kn, long hint) 971 { 972 struct pt_softc *pti; 973 struct tty *tp; 974 int canwrite; 975 int nwrite; 976 977 pti = kn->kn_hook; 978 tp = pti->pt_tty; 979 980 canwrite = (ISSET(tp->t_state, TS_ISOPEN) && 981 ((pti->pt_flags & PF_REMOTE) ? 982 (tp->t_canq.c_cc == 0) : 983 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 984 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))); 985 986 if (canwrite) { 987 if (pti->pt_flags & PF_REMOTE) 988 nwrite = tp->t_canq.c_cn; 989 else { 990 /* this is guaranteed to be > 0 due to above check */ 991 nwrite = tp->t_canq.c_cn 992 - (tp->t_rawq.c_cc + tp->t_canq.c_cc); 993 } 994 kn->kn_data = nwrite; 995 } 996 997 return (canwrite); 998 } 999 1000 static const struct filterops ptcread_filtops = 1001 { 1, NULL, filt_ptcrdetach, filt_ptcread }; 1002 static const struct filterops ptcwrite_filtops = 1003 { 1, NULL, filt_ptcwdetach, filt_ptcwrite }; 1004 1005 int 1006 ptckqfilter(dev_t dev, struct knote *kn) 1007 { 1008 struct pt_softc *pti = pt_softc[minor(dev)]; 1009 struct klist *klist; 1010 int s; 1011 1012 switch (kn->kn_filter) { 1013 case EVFILT_READ: 1014 klist = &pti->pt_selr.sel_klist; 1015 kn->kn_fop = &ptcread_filtops; 1016 break; 1017 case EVFILT_WRITE: 1018 klist = &pti->pt_selw.sel_klist; 1019 kn->kn_fop = &ptcwrite_filtops; 1020 break; 1021 default: 1022 return (1); 1023 } 1024 1025 kn->kn_hook = pti; 1026 1027 s = spltty(); 1028 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 1029 splx(s); 1030 1031 return (0); 1032 } 1033 1034 struct tty * 1035 ptytty(dev) 1036 dev_t dev; 1037 { 1038 struct pt_softc *pti = pt_softc[minor(dev)]; 1039 struct tty *tp = pti->pt_tty; 1040 1041 return (tp); 1042 } 1043 1044 /*ARGSUSED*/ 1045 int 1046 ptyioctl(dev, cmd, data, flag, p) 1047 dev_t dev; 1048 u_long cmd; 1049 caddr_t data; 1050 int flag; 1051 struct proc *p; 1052 { 1053 struct pt_softc *pti = pt_softc[minor(dev)]; 1054 struct tty *tp = pti->pt_tty; 1055 const struct cdevsw *cdev; 1056 u_char *cc = tp->t_cc; 1057 int stop, error, sig; 1058 int s; 1059 1060 cdev = cdevsw_lookup(dev); 1061 /* 1062 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 1063 * ttywflush(tp) will hang if there are characters in the outq. 1064 */ 1065 if (cmd == TIOCEXT) { 1066 /* 1067 * When the EXTPROC bit is being toggled, we need 1068 * to send an TIOCPKT_IOCTL if the packet driver 1069 * is turned on. 1070 */ 1071 if (*(int *)data) { 1072 if (pti->pt_flags & PF_PKT) { 1073 pti->pt_send |= TIOCPKT_IOCTL; 1074 ptcwakeup(tp, FREAD); 1075 } 1076 SET(tp->t_lflag, EXTPROC); 1077 } else { 1078 if (ISSET(tp->t_lflag, EXTPROC) && 1079 (pti->pt_flags & PF_PKT)) { 1080 pti->pt_send |= TIOCPKT_IOCTL; 1081 ptcwakeup(tp, FREAD); 1082 } 1083 CLR(tp->t_lflag, EXTPROC); 1084 } 1085 return(0); 1086 } 1087 1088 if (cdev != NULL && cdev->d_open == ptcopen) 1089 switch (cmd) { 1090 #ifndef NO_DEV_PTM 1091 case TIOCGRANTPT: 1092 return pty_grant_slave(p, dev); 1093 1094 case TIOCPTSNAME: 1095 pty_fill_ptmget(dev, -1, -1, data); 1096 return 0; 1097 #endif 1098 1099 case TIOCGPGRP: 1100 /* 1101 * We avoid calling ttioctl on the controller since, 1102 * in that case, tp must be the controlling terminal. 1103 */ 1104 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 1105 return (0); 1106 1107 case TIOCPKT: 1108 if (*(int *)data) { 1109 if (pti->pt_flags & PF_UCNTL) 1110 return (EINVAL); 1111 pti->pt_flags |= PF_PKT; 1112 } else 1113 pti->pt_flags &= ~PF_PKT; 1114 return (0); 1115 1116 case TIOCUCNTL: 1117 if (*(int *)data) { 1118 if (pti->pt_flags & PF_PKT) 1119 return (EINVAL); 1120 pti->pt_flags |= PF_UCNTL; 1121 } else 1122 pti->pt_flags &= ~PF_UCNTL; 1123 return (0); 1124 1125 case TIOCREMOTE: 1126 if (*(int *)data) 1127 pti->pt_flags |= PF_REMOTE; 1128 else 1129 pti->pt_flags &= ~PF_REMOTE; 1130 s = spltty(); 1131 TTY_LOCK(tp); 1132 ttyflush(tp, FREAD|FWRITE); 1133 TTY_UNLOCK(tp); 1134 splx(s); 1135 return (0); 1136 1137 #ifdef COMPAT_OLDTTY 1138 case TIOCSETP: 1139 case TIOCSETN: 1140 #endif 1141 case TIOCSETD: 1142 case TIOCSETA: 1143 case TIOCSETAW: 1144 case TIOCSETAF: 1145 TTY_LOCK(tp); 1146 ndflush(&tp->t_outq, tp->t_outq.c_cc); 1147 TTY_UNLOCK(tp); 1148 break; 1149 1150 case TIOCSIG: 1151 sig = (int)(long)*(caddr_t *)data; 1152 if (sig <= 0 || sig >= NSIG) 1153 return (EINVAL); 1154 TTY_LOCK(tp); 1155 if (!ISSET(tp->t_lflag, NOFLSH)) 1156 ttyflush(tp, FREAD|FWRITE); 1157 if ((sig == SIGINFO) && 1158 (!ISSET(tp->t_lflag, NOKERNINFO))) 1159 ttyinfo(tp); 1160 TTY_UNLOCK(tp); 1161 pgsignal(tp->t_pgrp, sig, 1); 1162 return(0); 1163 } 1164 1165 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 1166 if (error == EPASSTHROUGH) 1167 error = ttioctl(tp, cmd, data, flag, p); 1168 if (error == EPASSTHROUGH) { 1169 if (pti->pt_flags & PF_UCNTL && 1170 (cmd & ~0xff) == UIOCCMD(0)) { 1171 if (cmd & 0xff) { 1172 pti->pt_ucntl = (u_char)cmd; 1173 ptcwakeup(tp, FREAD); 1174 } 1175 return (0); 1176 } 1177 } 1178 /* 1179 * If external processing and packet mode send ioctl packet. 1180 */ 1181 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 1182 switch(cmd) { 1183 case TIOCSETA: 1184 case TIOCSETAW: 1185 case TIOCSETAF: 1186 #ifdef COMPAT_OLDTTY 1187 case TIOCSETP: 1188 case TIOCSETN: 1189 case TIOCSETC: 1190 case TIOCSLTC: 1191 case TIOCLBIS: 1192 case TIOCLBIC: 1193 case TIOCLSET: 1194 #endif 1195 pti->pt_send |= TIOCPKT_IOCTL; 1196 ptcwakeup(tp, FREAD); 1197 default: 1198 break; 1199 } 1200 } 1201 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 1202 && CCEQ(cc[VSTART], CTRL('q')); 1203 if (pti->pt_flags & PF_NOSTOP) { 1204 if (stop) { 1205 pti->pt_send &= ~TIOCPKT_NOSTOP; 1206 pti->pt_send |= TIOCPKT_DOSTOP; 1207 pti->pt_flags &= ~PF_NOSTOP; 1208 ptcwakeup(tp, FREAD); 1209 } 1210 } else { 1211 if (!stop) { 1212 pti->pt_send &= ~TIOCPKT_DOSTOP; 1213 pti->pt_send |= TIOCPKT_NOSTOP; 1214 pti->pt_flags |= PF_NOSTOP; 1215 ptcwakeup(tp, FREAD); 1216 } 1217 } 1218 return (error); 1219 } 1220 1221 #ifndef NO_DEV_PTM 1222 /* 1223 * Check if a pty is free to use. 1224 */ 1225 static __inline int 1226 pty_isfree_locked(int minor) 1227 { 1228 struct pt_softc *pt = pt_softc[minor]; 1229 return (pt == NULL || pt->pt_tty == NULL || 1230 pt->pt_tty->t_oproc == NULL); 1231 } 1232 1233 static int 1234 pty_isfree(int minor) 1235 { 1236 int isfree; 1237 1238 simple_lock(&pt_softc_mutex); 1239 isfree = pty_isfree_locked(minor); 1240 simple_unlock(&pt_softc_mutex); 1241 return(isfree); 1242 } 1243 1244 static char * 1245 pty_makename(char *buf, dev_t dev, char c) 1246 { 1247 size_t nt; 1248 dev_t minor = minor(dev); 1249 1250 (void)memcpy(buf, TTY_TEMPLATE, TTY_NAMESIZE); 1251 1252 buf[5] = c; 1253 1254 if (minor < 256) { 1255 nt = sizeof(TTY_OLD_SUFFIX) - 1; 1256 buf[8] = TTY_LETTERS[minor / nt]; 1257 buf[9] = TTY_OLD_SUFFIX[minor % nt]; 1258 } else { 1259 minor -= 256; 1260 nt = sizeof(TTY_NEW_SUFFIX) - sizeof(TTY_OLD_SUFFIX); 1261 buf[8] = TTY_LETTERS[minor / nt]; 1262 buf[9] = TTY_NEW_SUFFIX[minor % nt]; 1263 } 1264 return buf; 1265 } 1266 1267 static dev_t 1268 pty_getfree(void) 1269 { 1270 int i; 1271 1272 simple_lock(&pt_softc_mutex); 1273 for (i = 0; i < npty; i++) { 1274 if (pty_isfree_locked(i)) 1275 break; 1276 } 1277 simple_unlock(&pt_softc_mutex); 1278 return (makedev(pts_major, i)); 1279 } 1280 1281 /* 1282 * Hacked up version of vn_open. We _only_ handle ptys and only open 1283 * them with FREAD|FWRITE and never deal with creat or stuff like that. 1284 * 1285 * We need it because we have to fake up root credentials to open the pty. 1286 */ 1287 static int 1288 ptm_vn_open(struct nameidata *ndp) 1289 { 1290 struct vnode *vp; 1291 struct proc *p = ndp->ni_cnd.cn_proc; 1292 struct ucred *cred; 1293 int error; 1294 1295 if ((error = namei(ndp)) != 0) 1296 return (error); 1297 vp = ndp->ni_vp; 1298 if (vp->v_type != VCHR) { 1299 error = EINVAL; 1300 goto bad; 1301 } 1302 1303 /* 1304 * Get us a fresh cred with root privileges. 1305 */ 1306 cred = crget(); 1307 error = VOP_OPEN(vp, FREAD|FWRITE, cred, p); 1308 crfree(cred); 1309 1310 if (error) 1311 goto bad; 1312 1313 vp->v_writecount++; 1314 1315 return (0); 1316 bad: 1317 vput(vp); 1318 return (error); 1319 } 1320 1321 static int 1322 pty_alloc_master(struct proc *p, int *fd, dev_t *dev) 1323 { 1324 int error; 1325 struct nameidata nd; 1326 struct pt_softc *pti; 1327 struct file *fp; 1328 int md; 1329 char name[TTY_NAMESIZE]; 1330 1331 if ((error = falloc(p, &fp, fd)) != 0) { 1332 DPRINTF(("falloc %d\n", error)); 1333 return error; 1334 } 1335 retry: 1336 /* Find and open a free master pty. */ 1337 *dev = pty_getfree(); 1338 md = minor(*dev); 1339 if ((error = check_pty(md)) != 0) { 1340 DPRINTF(("ckeck_pty %d\n", error)); 1341 goto bad; 1342 } 1343 pti = pt_softc[md]; 1344 NDINIT(&nd, LOOKUP, NOFOLLOW|LOCKLEAF, UIO_SYSSPACE, 1345 pty_makename(name, *dev, 'p'), p); 1346 if ((error = ptm_vn_open(&nd)) != 0) { 1347 /* 1348 * Check if the master open failed because we lost 1349 * the race to grab it. 1350 */ 1351 if (error == EIO && !pty_isfree(md)) 1352 goto retry; 1353 DPRINTF(("ptm_vn_open %d\n", error)); 1354 goto bad; 1355 } 1356 fp->f_flag = FREAD|FWRITE; 1357 fp->f_type = DTYPE_VNODE; 1358 fp->f_ops = &vnops; 1359 fp->f_data = nd.ni_vp; 1360 VOP_UNLOCK(nd.ni_vp, 0); 1361 FILE_SET_MATURE(fp); 1362 FILE_UNUSE(fp, p); 1363 return 0; 1364 bad: 1365 FILE_UNUSE(fp, p); 1366 fdremove(p->p_fd, *fd); 1367 ffree(fp); 1368 return error; 1369 } 1370 1371 static int 1372 pty_grant_slave(struct proc *p, dev_t dev) 1373 { 1374 int error; 1375 struct nameidata nd; 1376 char name[TTY_NAMESIZE]; 1377 1378 /* 1379 * Open the slave. 1380 * namei -> setattr -> unlock -> revoke -> vrele -> 1381 * namei -> open -> unlock 1382 * Three stage rocket: 1383 * 1. Change the owner and permissions on the slave. 1384 * 2. Revoke all the users of the slave. 1385 * 3. open the slave. 1386 */ 1387 NDINIT(&nd, LOOKUP, NOFOLLOW|LOCKLEAF, UIO_SYSSPACE, 1388 pty_makename(name, dev, 't'), p); 1389 if ((error = namei(&nd)) != 0) { 1390 DPRINTF(("namei %d\n", error)); 1391 return error; 1392 } 1393 if ((nd.ni_vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 1394 struct vattr vattr; 1395 struct ucred *cred; 1396 gid_t gid = _TTY_GID; 1397 /* get real uid */ 1398 uid_t uid = p->p_cred->p_ruid; 1399 1400 VATTR_NULL(&vattr); 1401 vattr.va_uid = uid; 1402 vattr.va_gid = gid; 1403 vattr.va_mode = (S_IRUSR|S_IWUSR|S_IWGRP) & ALLPERMS; 1404 /* Get a fake cred to pretend we're root. */ 1405 cred = crget(); 1406 error = VOP_SETATTR(nd.ni_vp, &vattr, cred, p); 1407 crfree(cred); 1408 if (error) { 1409 DPRINTF(("setattr %d\n", error)); 1410 VOP_UNLOCK(nd.ni_vp, 0); 1411 vrele(nd.ni_vp); 1412 return error; 1413 } 1414 } 1415 VOP_UNLOCK(nd.ni_vp, 0); 1416 if (nd.ni_vp->v_usecount > 1 || 1417 (nd.ni_vp->v_flag & (VALIASED | VLAYER))) 1418 VOP_REVOKE(nd.ni_vp, REVOKEALL); 1419 1420 /* 1421 * The vnode is useless after the revoke, we need to 1422 * namei again. 1423 */ 1424 vrele(nd.ni_vp); 1425 return 0; 1426 } 1427 1428 static int 1429 pty_alloc_slave(struct proc *p, int *fd, dev_t dev) 1430 { 1431 int error; 1432 struct file *fp; 1433 struct nameidata nd; 1434 char name[TTY_NAMESIZE]; 1435 1436 /* Grab a filedescriptor for the slave */ 1437 if ((error = falloc(p, &fp, fd)) != 0) { 1438 DPRINTF(("falloc %d\n", error)); 1439 return error; 1440 } 1441 1442 NDINIT(&nd, LOOKUP, NOFOLLOW|LOCKLEAF, UIO_SYSSPACE, 1443 pty_makename(name, dev, 't'), p); 1444 1445 /* now open it */ 1446 if ((error = ptm_vn_open(&nd)) != 0) { 1447 DPRINTF(("vn_open %d\n", error)); 1448 FILE_UNUSE(fp, p); 1449 fdremove(p->p_fd, *fd); 1450 ffree(fp); 1451 return error; 1452 } 1453 fp->f_flag = FREAD|FWRITE; 1454 fp->f_type = DTYPE_VNODE; 1455 fp->f_ops = &vnops; 1456 fp->f_data = nd.ni_vp; 1457 VOP_UNLOCK(nd.ni_vp, 0); 1458 FILE_SET_MATURE(fp); 1459 FILE_UNUSE(fp, p); 1460 return 0; 1461 } 1462 1463 static void 1464 pty_fill_ptmget(dev_t dev, int cfd, int sfd, void *data) 1465 { 1466 struct ptmget *ptm = data; 1467 ptm->cfd = cfd; 1468 ptm->sfd = sfd; 1469 (void)pty_makename(ptm->cn, dev, 'p'); 1470 (void)pty_makename(ptm->sn, dev, 't'); 1471 } 1472 1473 void 1474 /*ARGSUSED*/ 1475 ptmattach(int n) 1476 { 1477 /* find the major and minor of the pty devices */ 1478 if ((pts_major = cdevsw_lookup_major(&pts_cdevsw)) == -1) 1479 panic("ptmattach: Can't find pty slave in cdevsw"); 1480 } 1481 1482 int 1483 /*ARGSUSED*/ 1484 ptmopen(dev_t dev, int flag, int mode, struct proc *p) 1485 { 1486 int error; 1487 int fd; 1488 1489 switch(minor(dev)) { 1490 case 0: /* /dev/ptmx */ 1491 if ((error = pty_alloc_master(p, &fd, &dev)) != 0) 1492 return error; 1493 curlwp->l_dupfd = fd; 1494 return ENXIO; 1495 case 1: /* /dev/ptm */ 1496 return 0; 1497 default: 1498 return ENODEV; 1499 } 1500 1501 } 1502 1503 int 1504 /*ARGSUSED*/ 1505 ptmclose(dev_t dev, int flag, int mode, struct proc *p) 1506 { 1507 return (0); 1508 } 1509 1510 int 1511 /*ARGSUSED*/ 1512 ptmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p) 1513 { 1514 int error; 1515 dev_t newdev; 1516 int cfd, sfd; 1517 struct file *fp; 1518 1519 error = 0; 1520 switch (cmd) { 1521 case TIOCPTMGET: 1522 if ((error = pty_alloc_master(p, &cfd, &newdev)) != 0) 1523 return error; 1524 1525 if ((error = pty_grant_slave(p, newdev)) != 0) 1526 goto bad; 1527 1528 if ((error = pty_alloc_slave(p, &sfd, newdev)) != 0) 1529 goto bad; 1530 1531 /* now, put the indices and names into struct ptmget */ 1532 pty_fill_ptmget(newdev, cfd, sfd, data); 1533 return 0; 1534 default: 1535 DPRINTF(("ptmioctl EINVAL\n")); 1536 return EINVAL; 1537 } 1538 bad: 1539 fp = fd_getfile(p->p_fd, cfd); 1540 fdremove(p->p_fd, cfd); 1541 ffree(fp); 1542 return error; 1543 } 1544 #endif 1545