tty_pty.c revision 1.56.4.2
1 /* $NetBSD: tty_pty.c,v 1.56.4.2 2001/09/26 15:28:22 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 = vdev_privdata(tp->t_devvp); 434 435 if (ISSET(tp->t_state, TS_TTSTOP)) 436 return; 437 if (pti->pt_flags & PF_STOPPED) { 438 pti->pt_flags &= ~PF_STOPPED; 439 pti->pt_send = TIOCPKT_START; 440 } 441 ptcwakeup(tp, FREAD); 442 } 443 444 void 445 ptsstop(tp, flush) 446 struct tty *tp; 447 int flush; 448 { 449 struct pt_softc *pti; 450 int flag; 451 452 pti = vdev_privdata(tp->t_devvp); 453 454 /* note: FLUSHREAD and FLUSHWRITE already ok */ 455 if (flush == 0) { 456 flush = TIOCPKT_STOP; 457 pti->pt_flags |= PF_STOPPED; 458 } else 459 pti->pt_flags &= ~PF_STOPPED; 460 pti->pt_send |= flush; 461 /* change of perspective */ 462 flag = 0; 463 if (flush & FREAD) 464 flag |= FWRITE; 465 if (flush & FWRITE) 466 flag |= FREAD; 467 ptcwakeup(tp, flag); 468 } 469 470 void 471 ptcwakeup(tp, flag) 472 struct tty *tp; 473 int flag; 474 { 475 struct pt_softc *pti; 476 477 pti = vdev_privdata(tp->t_devvp); 478 479 if (flag & FREAD) { 480 selwakeup(&pti->pt_selr); 481 wakeup((caddr_t)&tp->t_outq.c_cf); 482 } 483 if (flag & FWRITE) { 484 selwakeup(&pti->pt_selw); 485 wakeup((caddr_t)&tp->t_rawq.c_cf); 486 } 487 } 488 489 /*ARGSUSED*/ 490 int 491 ptcopen(devvp, flag, devtype, p) 492 struct vnode *devvp; 493 int flag, devtype; 494 struct proc *p; 495 { 496 struct pt_softc *pti; 497 struct tty *tp; 498 int error; 499 dev_t rdev; 500 501 rdev = vdev_rdev(devvp); 502 503 if ((error = check_pty(rdev))) 504 return (error); 505 506 pti = pt_softc[minor(rdev)]; 507 tp = pti->pt_tty; 508 vdev_setprivdata(devvp, pti); 509 510 if (tp->t_oproc) 511 return (EIO); 512 tp->t_oproc = ptsstart; 513 (void)(*tp->t_linesw->l_modem)(tp, 1); 514 CLR(tp->t_lflag, EXTPROC); 515 pti->pt_flags = 0; 516 pti->pt_send = 0; 517 pti->pt_ucntl = 0; 518 return (0); 519 } 520 521 /*ARGSUSED*/ 522 int 523 ptcclose(devvp, flag, devtype, p) 524 struct vnode *devvp; 525 int flag, devtype; 526 struct proc *p; 527 { 528 struct pt_softc *pti; 529 struct tty *tp; 530 531 pti = vdev_privdata(devvp); 532 tp = pti->pt_tty; 533 534 (void)(*tp->t_linesw->l_modem)(tp, 0); 535 CLR(tp->t_state, TS_CARR_ON); 536 tp->t_oproc = 0; /* mark closed */ 537 return (0); 538 } 539 540 int 541 ptcread(devvp, uio, flag) 542 struct vnode *devvp; 543 struct uio *uio; 544 int flag; 545 { 546 struct pt_softc *pti; 547 struct tty *tp; 548 char buf[BUFSIZ]; 549 int error = 0, cc; 550 551 pti = vdev_privdata(devvp); 552 tp = pti->pt_tty; 553 554 /* 555 * We want to block until the slave 556 * is open, and there's something to read; 557 * but if we lost the slave or we're NBIO, 558 * then return the appropriate error instead. 559 */ 560 for (;;) { 561 if (ISSET(tp->t_state, TS_ISOPEN)) { 562 if (pti->pt_flags&PF_PKT && pti->pt_send) { 563 error = ureadc((int)pti->pt_send, uio); 564 if (error) 565 return (error); 566 if (pti->pt_send & TIOCPKT_IOCTL) { 567 cc = min(uio->uio_resid, 568 sizeof(tp->t_termios)); 569 uiomove((caddr_t) &tp->t_termios, 570 cc, uio); 571 } 572 pti->pt_send = 0; 573 return (0); 574 } 575 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 576 error = ureadc((int)pti->pt_ucntl, uio); 577 if (error) 578 return (error); 579 pti->pt_ucntl = 0; 580 return (0); 581 } 582 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 583 break; 584 } 585 if (!ISSET(tp->t_state, TS_CARR_ON)) 586 return (0); /* EOF */ 587 if (flag & IO_NDELAY) 588 return (EWOULDBLOCK); 589 error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH, 590 ttyin, 0); 591 if (error) 592 return (error); 593 } 594 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 595 error = ureadc(0, uio); 596 while (uio->uio_resid > 0 && error == 0) { 597 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 598 if (cc <= 0) 599 break; 600 error = uiomove(buf, cc, uio); 601 } 602 if (tp->t_outq.c_cc <= tp->t_lowat) { 603 if (ISSET(tp->t_state, TS_ASLEEP)) { 604 CLR(tp->t_state, TS_ASLEEP); 605 wakeup((caddr_t)&tp->t_outq); 606 } 607 selwakeup(&tp->t_wsel); 608 } 609 return (error); 610 } 611 612 613 int 614 ptcwrite(devvp, uio, flag) 615 struct vnode *devvp; 616 struct uio *uio; 617 int flag; 618 { 619 struct pt_softc *pti; 620 struct tty *tp; 621 u_char *cp = NULL; 622 int cc = 0; 623 u_char locbuf[BUFSIZ]; 624 int cnt = 0; 625 int error = 0; 626 627 pti = vdev_privdata(devvp); 628 tp = pti->pt_tty; 629 630 again: 631 if (!ISSET(tp->t_state, TS_ISOPEN)) 632 goto block; 633 if (pti->pt_flags & PF_REMOTE) { 634 if (tp->t_canq.c_cc) 635 goto block; 636 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 637 if (cc == 0) { 638 cc = min(uio->uio_resid, BUFSIZ); 639 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 640 cp = locbuf; 641 error = uiomove((caddr_t)cp, cc, uio); 642 if (error) 643 return (error); 644 /* check again for safety */ 645 if (!ISSET(tp->t_state, TS_ISOPEN)) 646 return (EIO); 647 } 648 if (cc) 649 (void) b_to_q((char *)cp, cc, &tp->t_canq); 650 cc = 0; 651 } 652 (void) putc(0, &tp->t_canq); 653 ttwakeup(tp); 654 wakeup((caddr_t)&tp->t_canq); 655 return (0); 656 } 657 while (uio->uio_resid > 0) { 658 if (cc == 0) { 659 cc = min(uio->uio_resid, BUFSIZ); 660 cp = locbuf; 661 error = uiomove((caddr_t)cp, cc, uio); 662 if (error) 663 return (error); 664 /* check again for safety */ 665 if (!ISSET(tp->t_state, TS_ISOPEN)) 666 return (EIO); 667 } 668 while (cc > 0) { 669 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 670 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_iflag, ICANON))) { 671 wakeup((caddr_t)&tp->t_rawq); 672 goto block; 673 } 674 (*tp->t_linesw->l_rint)(*cp++, tp); 675 cnt++; 676 cc--; 677 } 678 cc = 0; 679 } 680 return (0); 681 block: 682 /* 683 * Come here to wait for slave to open, for space 684 * in outq, or space in rawq. 685 */ 686 if (!ISSET(tp->t_state, TS_CARR_ON)) 687 return (EIO); 688 if (flag & IO_NDELAY) { 689 /* adjust for data copied in but not written */ 690 uio->uio_resid += cc; 691 if (cnt == 0) 692 return (EWOULDBLOCK); 693 return (0); 694 } 695 error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 696 ttyout, 0); 697 if (error) { 698 /* adjust for data copied in but not written */ 699 uio->uio_resid += cc; 700 return (error); 701 } 702 goto again; 703 } 704 705 int 706 ptcpoll(devvp, events, p) 707 struct vnode *devvp; 708 int events; 709 struct proc *p; 710 { 711 struct pt_softc *pti; 712 struct tty *tp; 713 int revents; 714 int s; 715 716 pti = vdev_privdata(devvp); 717 tp = pti->pt_tty; 718 revents = 0; 719 720 s = splsoftclock(); 721 722 if (events & (POLLIN | POLLRDNORM)) 723 if (ISSET(tp->t_state, TS_ISOPEN) && 724 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 725 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 726 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 727 revents |= events & (POLLIN | POLLRDNORM); 728 729 if (events & (POLLOUT | POLLWRNORM)) 730 if (ISSET(tp->t_state, TS_ISOPEN) && 731 ((pti->pt_flags & PF_REMOTE) ? 732 (tp->t_canq.c_cc == 0) : 733 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 734 (tp->t_canq.c_cc == 0 && ISSET(tp->t_iflag, ICANON))))) 735 revents |= events & (POLLOUT | POLLWRNORM); 736 737 if (events & POLLHUP) 738 if (!ISSET(tp->t_state, TS_CARR_ON)) 739 revents |= POLLHUP; 740 741 if (revents == 0) { 742 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 743 selrecord(p, &pti->pt_selr); 744 745 if (events & (POLLOUT | POLLWRNORM)) 746 selrecord(p, &pti->pt_selw); 747 } 748 749 splx(s); 750 return (revents); 751 } 752 753 754 struct tty * 755 ptytty(devvp) 756 struct vnode *devvp; 757 { 758 struct pt_softc *pti; 759 760 pti = vdev_privdata(devvp); 761 return pti->pt_tty; 762 } 763 764 /*ARGSUSED*/ 765 int 766 ptyioctl(devvp, cmd, data, flag, p) 767 struct vnode *devvp; 768 u_long cmd; 769 caddr_t data; 770 int flag; 771 struct proc *p; 772 { 773 struct pt_softc *pti; 774 struct tty *tp; 775 u_char *cc; 776 int stop, error, sig; 777 778 pti = vdev_privdata(devvp); 779 tp = pti->pt_tty; 780 cc = tp->t_cc; 781 782 /* 783 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 784 * ttywflush(tp) will hang if there are characters in the outq. 785 */ 786 if (cmd == TIOCEXT) { 787 /* 788 * When the EXTPROC bit is being toggled, we need 789 * to send an TIOCPKT_IOCTL if the packet driver 790 * is turned on. 791 */ 792 if (*(int *)data) { 793 if (pti->pt_flags & PF_PKT) { 794 pti->pt_send |= TIOCPKT_IOCTL; 795 ptcwakeup(tp, FREAD); 796 } 797 SET(tp->t_lflag, EXTPROC); 798 } else { 799 if (ISSET(tp->t_lflag, EXTPROC) && 800 (pti->pt_flags & PF_PKT)) { 801 pti->pt_send |= TIOCPKT_IOCTL; 802 ptcwakeup(tp, FREAD); 803 } 804 CLR(tp->t_lflag, EXTPROC); 805 } 806 return(0); 807 } else 808 if (cdevsw[major(vdev_rdev(devvp))].d_open == ptcopen) 809 switch (cmd) { 810 811 case TIOCGPGRP: 812 #ifdef COMPAT_SUNOS 813 { 814 /* 815 * I'm not sure about SunOS TIOCGPGRP semantics 816 * on PTYs, but it's something like this: 817 */ 818 extern struct emul emul_sunos; 819 if (p->p_emul == &emul_sunos && tp->t_pgrp == 0) 820 return (EIO); 821 *(int *)data = tp->t_pgrp->pg_id; 822 return (0); 823 } 824 #endif 825 /* 826 * We avoid calling ttioctl on the controller since, 827 * in that case, tp must be the controlling terminal. 828 */ 829 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 830 return (0); 831 832 case TIOCPKT: 833 if (*(int *)data) { 834 if (pti->pt_flags & PF_UCNTL) 835 return (EINVAL); 836 pti->pt_flags |= PF_PKT; 837 } else 838 pti->pt_flags &= ~PF_PKT; 839 return (0); 840 841 case TIOCUCNTL: 842 if (*(int *)data) { 843 if (pti->pt_flags & PF_PKT) 844 return (EINVAL); 845 pti->pt_flags |= PF_UCNTL; 846 } else 847 pti->pt_flags &= ~PF_UCNTL; 848 return (0); 849 850 case TIOCREMOTE: 851 if (*(int *)data) 852 pti->pt_flags |= PF_REMOTE; 853 else 854 pti->pt_flags &= ~PF_REMOTE; 855 ttyflush(tp, FREAD|FWRITE); 856 return (0); 857 858 #ifdef COMPAT_OLDTTY 859 case TIOCSETP: 860 case TIOCSETN: 861 #endif 862 case TIOCSETD: 863 case TIOCSETA: 864 case TIOCSETAW: 865 case TIOCSETAF: 866 ndflush(&tp->t_outq, tp->t_outq.c_cc); 867 break; 868 869 case TIOCSIG: 870 sig = (int)(long)*(caddr_t *)data; 871 if (sig <= 0 || sig >= NSIG) 872 return (EINVAL); 873 if (!ISSET(tp->t_lflag, NOFLSH)) 874 ttyflush(tp, FREAD|FWRITE); 875 pgsignal(tp->t_pgrp, sig, 1); 876 if ((sig == SIGINFO) && 877 (!ISSET(tp->t_lflag, NOKERNINFO))) 878 ttyinfo(tp); 879 return(0); 880 } 881 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 882 if (error < 0) 883 error = ttioctl(tp, cmd, data, flag, p); 884 if (error < 0) { 885 if (pti->pt_flags & PF_UCNTL && 886 (cmd & ~0xff) == UIOCCMD(0)) { 887 if (cmd & 0xff) { 888 pti->pt_ucntl = (u_char)cmd; 889 ptcwakeup(tp, FREAD); 890 } 891 return (0); 892 } 893 error = ENOTTY; 894 } 895 /* 896 * If external processing and packet mode send ioctl packet. 897 */ 898 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 899 switch(cmd) { 900 case TIOCSETA: 901 case TIOCSETAW: 902 case TIOCSETAF: 903 #ifdef COMPAT_OLDTTY 904 case TIOCSETP: 905 case TIOCSETN: 906 case TIOCSETC: 907 case TIOCSLTC: 908 case TIOCLBIS: 909 case TIOCLBIC: 910 case TIOCLSET: 911 #endif 912 pti->pt_send |= TIOCPKT_IOCTL; 913 ptcwakeup(tp, FREAD); 914 default: 915 break; 916 } 917 } 918 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 919 && CCEQ(cc[VSTART], CTRL('q')); 920 if (pti->pt_flags & PF_NOSTOP) { 921 if (stop) { 922 pti->pt_send &= ~TIOCPKT_NOSTOP; 923 pti->pt_send |= TIOCPKT_DOSTOP; 924 pti->pt_flags &= ~PF_NOSTOP; 925 ptcwakeup(tp, FREAD); 926 } 927 } else { 928 if (!stop) { 929 pti->pt_send &= ~TIOCPKT_DOSTOP; 930 pti->pt_send |= TIOCPKT_NOSTOP; 931 pti->pt_flags |= PF_NOSTOP; 932 ptcwakeup(tp, FREAD); 933 } 934 } 935 return (error); 936 } 937
Indexes created Tue Sep 30 20:09:53 GMT 2025