tty_pty.c revision 1.56.4.3
1 /* $NetBSD: tty_pty.c,v 1.56.4.3 2001/10/13 17:42:52 fvdl 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95 36 */ 37 38 /* 39 * Pseudo-teletype Driver 40 * (Actually two drivers, requiring two entries in 'cdevsw') 41 */ 42 43 #include "opt_compat_sunos.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/file.h> 51 #include <sys/uio.h> 52 #include <sys/kernel.h> 53 #include <sys/vnode.h> 54 #include <sys/signalvar.h> 55 #include <sys/uio.h> 56 #include <sys/conf.h> 57 #include <sys/poll.h> 58 #include <sys/malloc.h> 59 60 #include <miscfs/specfs/specdev.h> 61 62 #define DEFAULT_NPTYS 16 /* default number of initial ptys */ 63 #define DEFAULT_MAXPTYS 256 /* default maximum number of ptys */ 64 65 /* Macros to clear/set/test flags. */ 66 #define SET(t, f) (t) |= (f) 67 #define CLR(t, f) (t) &= ~((unsigned)(f)) 68 #define ISSET(t, f) ((t) & (f)) 69 70 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 71 72 /* 73 * pts == /dev/tty[pqrs]? 74 * ptc == /dev/pty[pqrs]? 75 */ 76 struct pt_softc { 77 struct tty *pt_tty; 78 int pt_flags; 79 struct selinfo pt_selr, pt_selw; 80 u_char pt_send; 81 u_char pt_ucntl; 82 }; 83 84 static struct pt_softc **pt_softc = NULL; /* pty array */ 85 static int npty = 0; /* for pstat -t */ 86 static int maxptys = DEFAULT_MAXPTYS; /* maximum number of ptys (sysctable) */ 87 static struct simplelock pt_softc_mutex = SIMPLELOCK_INITIALIZER; 88 89 #define PF_PKT 0x08 /* packet mode */ 90 #define PF_STOPPED 0x10 /* user told stopped */ 91 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 92 #define PF_NOSTOP 0x40 93 #define PF_UCNTL 0x80 /* user control mode */ 94 95 void ptyattach __P((int)); 96 void ptcwakeup __P((struct tty *, int)); 97 void ptsstart __P((struct tty *)); 98 int pty_maxptys __P((int, int)); 99 100 static struct pt_softc **ptyarralloc __P((int)); 101 static int check_pty __P((dev_t)); 102 103 /* 104 * Allocate and zero array of nelem elements. 105 */ 106 static struct pt_softc ** 107 ptyarralloc(nelem) 108 int nelem; 109 { 110 struct pt_softc **pt; 111 nelem += 10; 112 pt = malloc(nelem * sizeof(struct pt_softc *), M_DEVBUF, M_WAITOK); 113 memset(pt, '\0', nelem * sizeof(struct pt_softc *)); 114 return pt; 115 } 116 117 /* 118 * Check if the minor is correct and ensure necessary structures 119 * are properly allocated. 120 */ 121 static int 122 check_pty(dev) 123 dev_t dev; 124 { 125 struct pt_softc *pti; 126 127 if (minor(dev) >= npty) { 128 struct pt_softc **newpt; 129 int newnpty; 130 131 /* check if the requested pty can be granted */ 132 if (minor(dev) >= maxptys) { 133 limit_reached: 134 tablefull("pty", "increase kern.maxptys"); 135 return (ENXIO); 136 } 137 138 /* 139 * Now grab the pty array mutex - we need to ensure 140 * that the pty array is consistent while copying it's 141 * content to newly allocated, larger space; we also 142 * need to be safe against pty_maxptys(). 143 */ 144 simple_lock(&pt_softc_mutex); 145 146 do { 147 for(newnpty = npty; newnpty <= minor(dev); 148 newnpty *= 2); 149 150 if (newnpty > maxptys) 151 newnpty = maxptys; 152 153 simple_unlock(&pt_softc_mutex); 154 newpt = ptyarralloc(newnpty); 155 simple_lock(&pt_softc_mutex); 156 157 if (maxptys == npty) { 158 simple_unlock(&pt_softc_mutex); 159 goto limit_reached; 160 } 161 } while(newnpty > maxptys); 162 163 /* 164 * If the pty array was not enlarged while we were waiting 165 * for mutex, copy current contents of pt_softc[] to newly 166 * allocated array and start using the new bigger array. 167 */ 168 if (minor(dev) >= npty) { 169 memcpy(newpt, pt_softc, npty*sizeof(struct pt_softc *)); 170 free(pt_softc, M_DEVBUF); 171 172 pt_softc = newpt; 173 npty = newnpty; 174 } else { 175 /* was enlarged when waited fot lock, free new space */ 176 free(newpt, M_DEVBUF); 177 } 178 179 simple_unlock(&pt_softc_mutex); 180 } 181 182 /* 183 * If the entry is not yet allocated, allocate one. The mutex is 184 * needed so that the state of pt_softc[] array is consistant 185 * in case it has been longened above. 186 */ 187 if (!pt_softc[minor(dev)]) { 188 MALLOC(pti, struct pt_softc *, sizeof(struct pt_softc), 189 M_DEVBUF, M_WAITOK); 190 191 pti->pt_tty = ttymalloc(); 192 193 simple_lock(&pt_softc_mutex); 194 195 /* 196 * Check the entry again - it might have been 197 * added while we were waiting for mutex. 198 */ 199 if (!pt_softc[minor(dev)]) { 200 tty_attach(pti->pt_tty); 201 pt_softc[minor(dev)] = pti; 202 } else { 203 ttyfree(pti->pt_tty); 204 FREE(pti, M_DEVBUF); 205 } 206 207 simple_unlock(&pt_softc_mutex); 208 } 209 210 return (0); 211 } 212 213 /* 214 * Set maxpty in thread-safe way. Returns 0 in case of error, otherwise 215 * new value of maxptys. 216 */ 217 int 218 pty_maxptys(newmax, set) 219 int newmax, set; 220 { 221 if (!set) 222 return (maxptys); 223 224 /* the value cannot be set to value lower than current number of ptys */ 225 if (newmax < npty) 226 return (0); 227 228 /* can proceed immediatelly if bigger than current maximum */ 229 if (newmax > maxptys) { 230 maxptys = newmax; 231 return (maxptys); 232 } 233 234 /* 235 * We have to grab the pt_softc lock, so that we would pick correct 236 * value of npty (might be modified in check_pty()). 237 */ 238 simple_lock(&pt_softc_mutex); 239 240 if (newmax > npty) 241 maxptys = newmax; 242 243 simple_unlock(&pt_softc_mutex); 244 245 return (maxptys); 246 } 247 248 /* 249 * Establish n (or default if n is 1) ptys in the system. 250 */ 251 void 252 ptyattach(n) 253 int n; 254 { 255 /* maybe should allow 0 => none? */ 256 if (n <= 1) 257 n = DEFAULT_NPTYS; 258 pt_softc = ptyarralloc(n); 259 npty = n; 260 } 261 262 /*ARGSUSED*/ 263 int 264 ptsopen(devvp, flag, devtype, p) 265 struct vnode *devvp; 266 int flag, devtype; 267 struct proc *p; 268 { 269 struct pt_softc *pti; 270 struct tty *tp; 271 int error; 272 dev_t rdev; 273 274 rdev = vdev_rdev(devvp); 275 276 if ((error = check_pty(rdev))) 277 return (error); 278 279 pti = pt_softc[minor(rdev)]; 280 tp = pti->pt_tty; 281 vdev_setprivdata(devvp, pti); 282 283 if (!ISSET(tp->t_state, TS_ISOPEN)) { 284 ttychars(tp); /* Set up default chars */ 285 tp->t_iflag = TTYDEF_IFLAG; 286 tp->t_oflag = TTYDEF_OFLAG; 287 tp->t_lflag = TTYDEF_LFLAG; 288 tp->t_cflag = TTYDEF_CFLAG; 289 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 290 ttsetwater(tp); /* would be done in xxparam() */ 291 } else if (ISSET(tp->t_state, TS_XCLUDE) && p->p_ucred->cr_uid != 0) 292 return (EBUSY); 293 if (tp->t_oproc) /* Ctrlr still around. */ 294 SET(tp->t_state, TS_CARR_ON); 295 if (!ISSET(flag, O_NONBLOCK)) 296 while (!ISSET(tp->t_state, TS_CARR_ON)) { 297 tp->t_wopen++; 298 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, 299 ttopen, 0); 300 tp->t_wopen--; 301 if (error) 302 return (error); 303 } 304 error = (*tp->t_linesw->l_open)(devvp, tp); 305 ptcwakeup(tp, FREAD|FWRITE); 306 return (error); 307 } 308 309 int 310 ptsclose(devvp, flag, mode, p) 311 struct vnode *devvp; 312 int flag, mode; 313 struct proc *p; 314 { 315 struct pt_softc *pti; 316 struct tty *tp; 317 int error; 318 319 pti = vdev_privdata(devvp); 320 tp = pti->pt_tty; 321 322 error = (*tp->t_linesw->l_close)(tp, flag); 323 error |= ttyclose(tp); 324 ptcwakeup(tp, FREAD|FWRITE); 325 return (error); 326 } 327 328 int 329 ptsread(devvp, uio, flag) 330 struct vnode *devvp; 331 struct uio *uio; 332 int flag; 333 { 334 struct proc *p = curproc; 335 struct pt_softc *pti; 336 struct tty *tp; 337 int error = 0; 338 339 pti = vdev_privdata(devvp); 340 tp = pti->pt_tty; 341 342 again: 343 if (pti->pt_flags & PF_REMOTE) { 344 while (isbackground(p, tp)) { 345 if (sigismasked(p, SIGTTIN) || 346 p->p_pgrp->pg_jobc == 0 || 347 p->p_flag & P_PPWAIT) 348 return (EIO); 349 pgsignal(p->p_pgrp, SIGTTIN, 1); 350 error = ttysleep(tp, (caddr_t)&lbolt, 351 TTIPRI | PCATCH, ttybg, 0); 352 if (error) 353 return (error); 354 } 355 if (tp->t_canq.c_cc == 0) { 356 if (flag & IO_NDELAY) 357 return (EWOULDBLOCK); 358 error = ttysleep(tp, (caddr_t)&tp->t_canq, 359 TTIPRI | PCATCH, ttyin, 0); 360 if (error) 361 return (error); 362 goto again; 363 } 364 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 365 if (ureadc(getc(&tp->t_canq), uio) < 0) { 366 error = EFAULT; 367 break; 368 } 369 if (tp->t_canq.c_cc == 1) 370 (void) getc(&tp->t_canq); 371 if (tp->t_canq.c_cc) 372 return (error); 373 } else 374 if (tp->t_oproc) 375 error = (*tp->t_linesw->l_read)(tp, uio, flag); 376 ptcwakeup(tp, FWRITE); 377 return (error); 378 } 379 380 /* 381 * Write to pseudo-tty. 382 * Wakeups of controlling tty will happen 383 * indirectly, when tty driver calls ptsstart. 384 */ 385 int 386 ptswrite(devvp, uio, flag) 387 struct vnode *devvp; 388 struct uio *uio; 389 int flag; 390 { 391 struct pt_softc *pti; 392 struct tty *tp; 393 394 pti = vdev_privdata(devvp); 395 tp = pti->pt_tty; 396 397 if (tp->t_oproc == 0) 398 return (EIO); 399 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 400 } 401 402 /* 403 * Poll pseudo-tty. 404 */ 405 int 406 ptspoll(devvp, events, p) 407 struct vnode *devvp; 408 int events; 409 struct proc *p; 410 { 411 struct pt_softc *pti; 412 struct tty *tp; 413 414 pti = vdev_privdata(devvp); 415 tp = pti->pt_tty; 416 417 if (tp->t_oproc == 0) 418 return (EIO); 419 420 return ((*tp->t_linesw->l_poll)(tp, events, p)); 421 } 422 423 /* 424 * Start output on pseudo-tty. 425 * Wake up process polling or sleeping for input from controlling tty. 426 */ 427 void 428 ptsstart(tp) 429 struct tty *tp; 430 { 431 struct pt_softc *pti; 432 433 pti = pt_softc[minor(tp->t_dev)]; 434 435 436 if (ISSET(tp->t_state, TS_TTSTOP)) 437 return; 438 if (pti->pt_flags & PF_STOPPED) { 439 pti->pt_flags &= ~PF_STOPPED; 440 pti->pt_send = TIOCPKT_START; 441 } 442 ptcwakeup(tp, FREAD); 443 } 444 445 void 446 ptsstop(tp, flush) 447 struct tty *tp; 448 int flush; 449 { 450 struct pt_softc *pti; 451 int flag; 452 453 pti = pt_softc[minor(tp->t_dev)]; 454 455 /* note: FLUSHREAD and FLUSHWRITE already ok */ 456 if (flush == 0) { 457 flush = TIOCPKT_STOP; 458 pti->pt_flags |= PF_STOPPED; 459 } else 460 pti->pt_flags &= ~PF_STOPPED; 461 pti->pt_send |= flush; 462 /* change of perspective */ 463 flag = 0; 464 if (flush & FREAD) 465 flag |= FWRITE; 466 if (flush & FWRITE) 467 flag |= FREAD; 468 ptcwakeup(tp, flag); 469 } 470 471 void 472 ptcwakeup(tp, flag) 473 struct tty *tp; 474 int flag; 475 { 476 struct pt_softc *pti; 477 478 pti = pt_softc[minor(tp->t_dev)]; 479 480 if (flag & FREAD) { 481 selwakeup(&pti->pt_selr); 482 wakeup((caddr_t)&tp->t_outq.c_cf); 483 } 484 if (flag & FWRITE) { 485 selwakeup(&pti->pt_selw); 486 wakeup((caddr_t)&tp->t_rawq.c_cf); 487 } 488 } 489 490 /*ARGSUSED*/ 491 int 492 ptcopen(devvp, flag, devtype, p) 493 struct vnode *devvp; 494 int flag, devtype; 495 struct proc *p; 496 { 497 struct pt_softc *pti; 498 struct tty *tp; 499 int error; 500 dev_t rdev; 501 502 rdev = vdev_rdev(devvp); 503 504 if ((error = check_pty(rdev))) 505 return (error); 506 507 pti = pt_softc[minor(rdev)]; 508 tp = pti->pt_tty; 509 vdev_setprivdata(devvp, pti); 510 511 if (tp->t_oproc) 512 return (EIO); 513 tp->t_oproc = ptsstart; 514 (void)(*tp->t_linesw->l_modem)(tp, 1); 515 CLR(tp->t_lflag, EXTPROC); 516 pti->pt_flags = 0; 517 pti->pt_send = 0; 518 pti->pt_ucntl = 0; 519 return (0); 520 } 521 522 /*ARGSUSED*/ 523 int 524 ptcclose(devvp, flag, devtype, p) 525 struct vnode *devvp; 526 int flag, devtype; 527 struct proc *p; 528 { 529 struct pt_softc *pti; 530 struct tty *tp; 531 532 pti = vdev_privdata(devvp); 533 tp = pti->pt_tty; 534 535 (void)(*tp->t_linesw->l_modem)(tp, 0); 536 CLR(tp->t_state, TS_CARR_ON); 537 tp->t_oproc = 0; /* mark closed */ 538 return (0); 539 } 540 541 int 542 ptcread(devvp, uio, flag) 543 struct vnode *devvp; 544 struct uio *uio; 545 int flag; 546 { 547 struct pt_softc *pti; 548 struct tty *tp; 549 char buf[BUFSIZ]; 550 int error = 0, cc; 551 552 pti = vdev_privdata(devvp); 553 tp = pti->pt_tty; 554 555 /* 556 * We want to block until the slave 557 * is open, and there's something to read; 558 * but if we lost the slave or we're NBIO, 559 * then return the appropriate error instead. 560 */ 561 for (;;) { 562 if (ISSET(tp->t_state, TS_ISOPEN)) { 563 if (pti->pt_flags&PF_PKT && pti->pt_send) { 564 error = ureadc((int)pti->pt_send, uio); 565 if (error) 566 return (error); 567 if (pti->pt_send & TIOCPKT_IOCTL) { 568 cc = min(uio->uio_resid, 569 sizeof(tp->t_termios)); 570 uiomove((caddr_t) &tp->t_termios, 571 cc, uio); 572 } 573 pti->pt_send = 0; 574 return (0); 575 } 576 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 577 error = ureadc((int)pti->pt_ucntl, uio); 578 if (error) 579 return (error); 580 pti->pt_ucntl = 0; 581 return (0); 582 } 583 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 584 break; 585 } 586 if (!ISSET(tp->t_state, TS_CARR_ON)) 587 return (0); /* EOF */ 588 if (flag & IO_NDELAY) 589 return (EWOULDBLOCK); 590 error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH, 591 ttyin, 0); 592 if (error) 593 return (error); 594 } 595 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 596 error = ureadc(0, uio); 597 while (uio->uio_resid > 0 && error == 0) { 598 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 599 if (cc <= 0) 600 break; 601 error = uiomove(buf, cc, uio); 602 } 603 if (tp->t_outq.c_cc <= tp->t_lowat) { 604 if (ISSET(tp->t_state, TS_ASLEEP)) { 605 CLR(tp->t_state, TS_ASLEEP); 606 wakeup((caddr_t)&tp->t_outq); 607 } 608 selwakeup(&tp->t_wsel); 609 } 610 return (error); 611 } 612 613 614 int 615 ptcwrite(devvp, uio, flag) 616 struct vnode *devvp; 617 struct uio *uio; 618 int flag; 619 { 620 struct pt_softc *pti; 621 struct tty *tp; 622 u_char *cp = NULL; 623 int cc = 0; 624 u_char locbuf[BUFSIZ]; 625 int cnt = 0; 626 int error = 0; 627 628 pti = vdev_privdata(devvp); 629 tp = pti->pt_tty; 630 631 again: 632 if (!ISSET(tp->t_state, TS_ISOPEN)) 633 goto block; 634 if (pti->pt_flags & PF_REMOTE) { 635 if (tp->t_canq.c_cc) 636 goto block; 637 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 638 if (cc == 0) { 639 cc = min(uio->uio_resid, BUFSIZ); 640 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 641 cp = locbuf; 642 error = uiomove((caddr_t)cp, cc, uio); 643 if (error) 644 return (error); 645 /* check again for safety */ 646 if (!ISSET(tp->t_state, TS_ISOPEN)) 647 return (EIO); 648 } 649 if (cc) 650 (void) b_to_q((char *)cp, cc, &tp->t_canq); 651 cc = 0; 652 } 653 (void) putc(0, &tp->t_canq); 654 ttwakeup(tp); 655 wakeup((caddr_t)&tp->t_canq); 656 return (0); 657 } 658 while (uio->uio_resid > 0) { 659 if (cc == 0) { 660 cc = min(uio->uio_resid, BUFSIZ); 661 cp = locbuf; 662 error = uiomove((caddr_t)cp, cc, uio); 663 if (error) 664 return (error); 665 /* check again for safety */ 666 if (!ISSET(tp->t_state, TS_ISOPEN)) 667 return (EIO); 668 } 669 while (cc > 0) { 670 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 671 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_iflag, ICANON))) { 672 wakeup((caddr_t)&tp->t_rawq); 673 goto block; 674 } 675 (*tp->t_linesw->l_rint)(*cp++, tp); 676 cnt++; 677 cc--; 678 } 679 cc = 0; 680 } 681 return (0); 682 block: 683 /* 684 * Come here to wait for slave to open, for space 685 * in outq, or space in rawq. 686 */ 687 if (!ISSET(tp->t_state, TS_CARR_ON)) 688 return (EIO); 689 if (flag & IO_NDELAY) { 690 /* adjust for data copied in but not written */ 691 uio->uio_resid += cc; 692 if (cnt == 0) 693 return (EWOULDBLOCK); 694 return (0); 695 } 696 error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 697 ttyout, 0); 698 if (error) { 699 /* adjust for data copied in but not written */ 700 uio->uio_resid += cc; 701 return (error); 702 } 703 goto again; 704 } 705 706 int 707 ptcpoll(devvp, events, p) 708 struct vnode *devvp; 709 int events; 710 struct proc *p; 711 { 712 struct pt_softc *pti; 713 struct tty *tp; 714 int revents; 715 int s; 716 717 pti = vdev_privdata(devvp); 718 tp = pti->pt_tty; 719 revents = 0; 720 721 s = splsoftclock(); 722 723 if (events & (POLLIN | POLLRDNORM)) 724 if (ISSET(tp->t_state, TS_ISOPEN) && 725 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 726 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 727 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 728 revents |= events & (POLLIN | POLLRDNORM); 729 730 if (events & (POLLOUT | POLLWRNORM)) 731 if (ISSET(tp->t_state, TS_ISOPEN) && 732 ((pti->pt_flags & PF_REMOTE) ? 733 (tp->t_canq.c_cc == 0) : 734 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 735 (tp->t_canq.c_cc == 0 && ISSET(tp->t_iflag, ICANON))))) 736 revents |= events & (POLLOUT | POLLWRNORM); 737 738 if (events & POLLHUP) 739 if (!ISSET(tp->t_state, TS_CARR_ON)) 740 revents |= POLLHUP; 741 742 if (revents == 0) { 743 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 744 selrecord(p, &pti->pt_selr); 745 746 if (events & (POLLOUT | POLLWRNORM)) 747 selrecord(p, &pti->pt_selw); 748 } 749 750 splx(s); 751 return (revents); 752 } 753 754 755 struct tty * 756 ptytty(devvp) 757 struct vnode *devvp; 758 { 759 struct pt_softc *pti; 760 761 pti = vdev_privdata(devvp); 762 return pti->pt_tty; 763 } 764 765 /*ARGSUSED*/ 766 int 767 ptyioctl(devvp, cmd, data, flag, p) 768 struct vnode *devvp; 769 u_long cmd; 770 caddr_t data; 771 int flag; 772 struct proc *p; 773 { 774 struct pt_softc *pti; 775 struct tty *tp; 776 u_char *cc; 777 int stop, error, sig; 778 779 pti = vdev_privdata(devvp); 780 tp = pti->pt_tty; 781 cc = tp->t_cc; 782 783 /* 784 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 785 * ttywflush(tp) will hang if there are characters in the outq. 786 */ 787 if (cmd == TIOCEXT) { 788 /* 789 * When the EXTPROC bit is being toggled, we need 790 * to send an TIOCPKT_IOCTL if the packet driver 791 * is turned on. 792 */ 793 if (*(int *)data) { 794 if (pti->pt_flags & PF_PKT) { 795 pti->pt_send |= TIOCPKT_IOCTL; 796 ptcwakeup(tp, FREAD); 797 } 798 SET(tp->t_lflag, EXTPROC); 799 } else { 800 if (ISSET(tp->t_lflag, EXTPROC) && 801 (pti->pt_flags & PF_PKT)) { 802 pti->pt_send |= TIOCPKT_IOCTL; 803 ptcwakeup(tp, FREAD); 804 } 805 CLR(tp->t_lflag, EXTPROC); 806 } 807 return(0); 808 } else 809 if (cdevsw[major(vdev_rdev(devvp))].d_open == ptcopen) 810 switch (cmd) { 811 812 case TIOCGPGRP: 813 #ifdef COMPAT_SUNOS 814 { 815 /* 816 * I'm not sure about SunOS TIOCGPGRP semantics 817 * on PTYs, but it's something like this: 818 */ 819 extern struct emul emul_sunos; 820 if (p->p_emul == &emul_sunos && tp->t_pgrp == 0) 821 return (EIO); 822 *(int *)data = tp->t_pgrp->pg_id; 823 return (0); 824 } 825 #endif 826 /* 827 * We avoid calling ttioctl on the controller since, 828 * in that case, tp must be the controlling terminal. 829 */ 830 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 831 return (0); 832 833 case TIOCPKT: 834 if (*(int *)data) { 835 if (pti->pt_flags & PF_UCNTL) 836 return (EINVAL); 837 pti->pt_flags |= PF_PKT; 838 } else 839 pti->pt_flags &= ~PF_PKT; 840 return (0); 841 842 case TIOCUCNTL: 843 if (*(int *)data) { 844 if (pti->pt_flags & PF_PKT) 845 return (EINVAL); 846 pti->pt_flags |= PF_UCNTL; 847 } else 848 pti->pt_flags &= ~PF_UCNTL; 849 return (0); 850 851 case TIOCREMOTE: 852 if (*(int *)data) 853 pti->pt_flags |= PF_REMOTE; 854 else 855 pti->pt_flags &= ~PF_REMOTE; 856 ttyflush(tp, FREAD|FWRITE); 857 return (0); 858 859 #ifdef COMPAT_OLDTTY 860 case TIOCSETP: 861 case TIOCSETN: 862 #endif 863 case TIOCSETD: 864 case TIOCSETA: 865 case TIOCSETAW: 866 case TIOCSETAF: 867 ndflush(&tp->t_outq, tp->t_outq.c_cc); 868 break; 869 870 case TIOCSIG: 871 sig = (int)(long)*(caddr_t *)data; 872 if (sig <= 0 || sig >= NSIG) 873 return (EINVAL); 874 if (!ISSET(tp->t_lflag, NOFLSH)) 875 ttyflush(tp, FREAD|FWRITE); 876 pgsignal(tp->t_pgrp, sig, 1); 877 if ((sig == SIGINFO) && 878 (!ISSET(tp->t_lflag, NOKERNINFO))) 879 ttyinfo(tp); 880 return(0); 881 } 882 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 883 if (error < 0) 884 error = ttioctl(tp, devvp, cmd, data, flag, p); 885 if (error < 0) { 886 if (pti->pt_flags & PF_UCNTL && 887 (cmd & ~0xff) == UIOCCMD(0)) { 888 if (cmd & 0xff) { 889 pti->pt_ucntl = (u_char)cmd; 890 ptcwakeup(tp, FREAD); 891 } 892 return (0); 893 } 894 error = ENOTTY; 895 } 896 /* 897 * If external processing and packet mode send ioctl packet. 898 */ 899 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 900 switch(cmd) { 901 case TIOCSETA: 902 case TIOCSETAW: 903 case TIOCSETAF: 904 #ifdef COMPAT_OLDTTY 905 case TIOCSETP: 906 case TIOCSETN: 907 case TIOCSETC: 908 case TIOCSLTC: 909 case TIOCLBIS: 910 case TIOCLBIC: 911 case TIOCLSET: 912 #endif 913 pti->pt_send |= TIOCPKT_IOCTL; 914 ptcwakeup(tp, FREAD); 915 default: 916 break; 917 } 918 } 919 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 920 && CCEQ(cc[VSTART], CTRL('q')); 921 if (pti->pt_flags & PF_NOSTOP) { 922 if (stop) { 923 pti->pt_send &= ~TIOCPKT_NOSTOP; 924 pti->pt_send |= TIOCPKT_DOSTOP; 925 pti->pt_flags &= ~PF_NOSTOP; 926 ptcwakeup(tp, FREAD); 927 } 928 } else { 929 if (!stop) { 930 pti->pt_send &= ~TIOCPKT_DOSTOP; 931 pti->pt_send |= TIOCPKT_NOSTOP; 932 pti->pt_flags |= PF_NOSTOP; 933 ptcwakeup(tp, FREAD); 934 } 935 } 936 return (error); 937 } 938
Indexes created Tue Sep 30 20:09:53 GMT 2025