tty_pty.c revision 1.56.2.6
1 /* $NetBSD: tty_pty.c,v 1.56.2.6 2002/09/24 10:45:23 jdolecek 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 <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: tty_pty.c,v 1.56.2.6 2002/09/24 10:45:23 jdolecek Exp $"); 45 46 #include "opt_compat_sunos.h" 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/ioctl.h> 51 #include <sys/proc.h> 52 #include <sys/tty.h> 53 #include <sys/file.h> 54 #include <sys/uio.h> 55 #include <sys/kernel.h> 56 #include <sys/vnode.h> 57 #include <sys/signalvar.h> 58 #include <sys/uio.h> 59 #include <sys/conf.h> 60 #include <sys/poll.h> 61 #include <sys/malloc.h> 62 63 #define DEFAULT_NPTYS 16 /* default number of initial ptys */ 64 #define DEFAULT_MAXPTYS 992 /* default maximum number of ptys */ 65 66 /* Macros to clear/set/test flags. */ 67 #define SET(t, f) (t) |= (f) 68 #define CLR(t, f) (t) &= ~((unsigned)(f)) 69 #define ISSET(t, f) ((t) & (f)) 70 71 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 72 73 /* 74 * pts == /dev/tty[pqrs]? 75 * ptc == /dev/pty[pqrs]? 76 */ 77 struct pt_softc { 78 struct tty *pt_tty; 79 int pt_flags; 80 struct selinfo pt_selr, pt_selw; 81 u_char pt_send; 82 u_char pt_ucntl; 83 }; 84 85 static struct pt_softc **pt_softc = NULL; /* pty array */ 86 static int npty = 0; /* for pstat -t */ 87 static int maxptys = DEFAULT_MAXPTYS; /* maximum number of ptys (sysctable) */ 88 static struct simplelock pt_softc_mutex = SIMPLELOCK_INITIALIZER; 89 90 #define PF_PKT 0x08 /* packet mode */ 91 #define PF_STOPPED 0x10 /* user told stopped */ 92 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 93 #define PF_NOSTOP 0x40 94 #define PF_UCNTL 0x80 /* user control mode */ 95 96 void ptyattach __P((int)); 97 void ptcwakeup __P((struct tty *, int)); 98 int ptcopen __P((dev_t, int, int, struct proc *)); 99 struct tty *ptytty __P((dev_t)); 100 void ptsstart __P((struct tty *)); 101 int pty_maxptys __P((int, int)); 102 103 static struct pt_softc **ptyarralloc __P((int)); 104 static int check_pty __P((dev_t)); 105 106 /* 107 * Allocate and zero array of nelem elements. 108 */ 109 static struct pt_softc ** 110 ptyarralloc(nelem) 111 int nelem; 112 { 113 struct pt_softc **pt; 114 nelem += 10; 115 pt = malloc(nelem * sizeof(struct pt_softc *), M_DEVBUF, M_WAITOK); 116 memset(pt, '\0', nelem * sizeof(struct pt_softc *)); 117 return pt; 118 } 119 120 /* 121 * Check if the minor is correct and ensure necessary structures 122 * are properly allocated. 123 */ 124 static int 125 check_pty(dev) 126 dev_t dev; 127 { 128 struct pt_softc *pti; 129 130 if (minor(dev) >= npty) { 131 struct pt_softc **newpt; 132 int newnpty; 133 134 /* check if the requested pty can be granted */ 135 if (minor(dev) >= maxptys) { 136 limit_reached: 137 tablefull("pty", "increase kern.maxptys"); 138 return (ENXIO); 139 } 140 141 /* 142 * Now grab the pty array mutex - we need to ensure 143 * that the pty array is consistent while copying it's 144 * content to newly allocated, larger space; we also 145 * need to be safe against pty_maxptys(). 146 */ 147 simple_lock(&pt_softc_mutex); 148 149 do { 150 for(newnpty = npty; newnpty <= minor(dev); 151 newnpty *= 2); 152 153 if (newnpty > maxptys) 154 newnpty = maxptys; 155 156 simple_unlock(&pt_softc_mutex); 157 newpt = ptyarralloc(newnpty); 158 simple_lock(&pt_softc_mutex); 159 160 if (maxptys == npty) { 161 simple_unlock(&pt_softc_mutex); 162 goto limit_reached; 163 } 164 } while(newnpty > maxptys); 165 166 /* 167 * If the pty array was not enlarged while we were waiting 168 * for mutex, copy current contents of pt_softc[] to newly 169 * allocated array and start using the new bigger array. 170 */ 171 if (minor(dev) >= npty) { 172 memcpy(newpt, pt_softc, npty*sizeof(struct pt_softc *)); 173 free(pt_softc, M_DEVBUF); 174 175 pt_softc = newpt; 176 npty = newnpty; 177 } else { 178 /* was enlarged when waited fot lock, free new space */ 179 free(newpt, M_DEVBUF); 180 } 181 182 simple_unlock(&pt_softc_mutex); 183 } 184 185 /* 186 * If the entry is not yet allocated, allocate one. The mutex is 187 * needed so that the state of pt_softc[] array is consistant 188 * in case it has been longened above. 189 */ 190 if (!pt_softc[minor(dev)]) { 191 MALLOC(pti, struct pt_softc *, sizeof(struct pt_softc), 192 M_DEVBUF, M_WAITOK); 193 memset(pti, 0, sizeof(struct pt_softc)); 194 195 pti->pt_tty = ttymalloc(); 196 197 simple_lock(&pt_softc_mutex); 198 199 /* 200 * Check the entry again - it might have been 201 * added while we were waiting for mutex. 202 */ 203 if (!pt_softc[minor(dev)]) { 204 tty_attach(pti->pt_tty); 205 pt_softc[minor(dev)] = pti; 206 } else { 207 ttyfree(pti->pt_tty); 208 FREE(pti, M_DEVBUF); 209 } 210 211 simple_unlock(&pt_softc_mutex); 212 } 213 214 return (0); 215 } 216 217 /* 218 * Set maxpty in thread-safe way. Returns 0 in case of error, otherwise 219 * new value of maxptys. 220 */ 221 int 222 pty_maxptys(newmax, set) 223 int newmax, set; 224 { 225 if (!set) 226 return (maxptys); 227 228 /* the value cannot be set to value lower than current number of ptys */ 229 if (newmax < npty) 230 return (0); 231 232 /* can proceed immediatelly if bigger than current maximum */ 233 if (newmax > maxptys) { 234 maxptys = newmax; 235 return (maxptys); 236 } 237 238 /* 239 * We have to grab the pt_softc lock, so that we would pick correct 240 * value of npty (might be modified in check_pty()). 241 */ 242 simple_lock(&pt_softc_mutex); 243 244 if (newmax > npty) 245 maxptys = newmax; 246 247 simple_unlock(&pt_softc_mutex); 248 249 return (maxptys); 250 } 251 252 /* 253 * Establish n (or default if n is 1) ptys in the system. 254 */ 255 void 256 ptyattach(n) 257 int n; 258 { 259 /* maybe should allow 0 => none? */ 260 if (n <= 1) 261 n = DEFAULT_NPTYS; 262 pt_softc = ptyarralloc(n); 263 npty = n; 264 } 265 266 /*ARGSUSED*/ 267 int 268 ptsopen(dev, flag, devtype, p) 269 dev_t dev; 270 int flag, devtype; 271 struct proc *p; 272 { 273 struct pt_softc *pti; 274 struct tty *tp; 275 int error; 276 277 if ((error = check_pty(dev))) 278 return (error); 279 280 pti = pt_softc[minor(dev)]; 281 tp = pti->pt_tty; 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)(dev, tp); 305 ptcwakeup(tp, FREAD|FWRITE); 306 return (error); 307 } 308 309 int 310 ptsclose(dev, flag, mode, p) 311 dev_t dev; 312 int flag, mode; 313 struct proc *p; 314 { 315 struct pt_softc *pti = pt_softc[minor(dev)]; 316 struct tty *tp = pti->pt_tty; 317 int error; 318 319 error = (*tp->t_linesw->l_close)(tp, flag); 320 error |= ttyclose(tp); 321 ptcwakeup(tp, FREAD|FWRITE); 322 return (error); 323 } 324 325 int 326 ptsread(dev, uio, flag) 327 dev_t dev; 328 struct uio *uio; 329 int flag; 330 { 331 struct proc *p = curproc; 332 struct pt_softc *pti = pt_softc[minor(dev)]; 333 struct tty *tp = pti->pt_tty; 334 int error = 0; 335 336 again: 337 if (pti->pt_flags & PF_REMOTE) { 338 while (isbackground(p, tp)) { 339 if (sigismasked(p, SIGTTIN) || 340 p->p_pgrp->pg_jobc == 0 || 341 p->p_flag & P_PPWAIT) 342 return (EIO); 343 pgsignal(p->p_pgrp, SIGTTIN, 1); 344 error = ttysleep(tp, (caddr_t)&lbolt, 345 TTIPRI | PCATCH, ttybg, 0); 346 if (error) 347 return (error); 348 } 349 if (tp->t_canq.c_cc == 0) { 350 if (flag & IO_NDELAY) 351 return (EWOULDBLOCK); 352 error = ttysleep(tp, (caddr_t)&tp->t_canq, 353 TTIPRI | PCATCH, ttyin, 0); 354 if (error) 355 return (error); 356 goto again; 357 } 358 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 359 if (ureadc(getc(&tp->t_canq), uio) < 0) { 360 error = EFAULT; 361 break; 362 } 363 if (tp->t_canq.c_cc == 1) 364 (void) getc(&tp->t_canq); 365 if (tp->t_canq.c_cc) 366 return (error); 367 } else 368 if (tp->t_oproc) 369 error = (*tp->t_linesw->l_read)(tp, uio, flag); 370 ptcwakeup(tp, FWRITE); 371 return (error); 372 } 373 374 /* 375 * Write to pseudo-tty. 376 * Wakeups of controlling tty will happen 377 * indirectly, when tty driver calls ptsstart. 378 */ 379 int 380 ptswrite(dev, uio, flag) 381 dev_t dev; 382 struct uio *uio; 383 int flag; 384 { 385 struct pt_softc *pti = pt_softc[minor(dev)]; 386 struct tty *tp = pti->pt_tty; 387 388 if (tp->t_oproc == 0) 389 return (EIO); 390 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 391 } 392 393 /* 394 * Poll pseudo-tty. 395 */ 396 int 397 ptspoll(dev, events, p) 398 dev_t dev; 399 int events; 400 struct proc *p; 401 { 402 struct pt_softc *pti = pt_softc[minor(dev)]; 403 struct tty *tp = pti->pt_tty; 404 405 if (tp->t_oproc == 0) 406 return (EIO); 407 408 return ((*tp->t_linesw->l_poll)(tp, events, p)); 409 } 410 411 /* 412 * Start output on pseudo-tty. 413 * Wake up process polling or sleeping for input from controlling tty. 414 */ 415 void 416 ptsstart(tp) 417 struct tty *tp; 418 { 419 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 420 421 if (ISSET(tp->t_state, TS_TTSTOP)) 422 return; 423 if (pti->pt_flags & PF_STOPPED) { 424 pti->pt_flags &= ~PF_STOPPED; 425 pti->pt_send = TIOCPKT_START; 426 } 427 ptcwakeup(tp, FREAD); 428 } 429 430 void 431 ptsstop(tp, flush) 432 struct tty *tp; 433 int flush; 434 { 435 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 436 int flag; 437 438 /* note: FLUSHREAD and FLUSHWRITE already ok */ 439 if (flush == 0) { 440 flush = TIOCPKT_STOP; 441 pti->pt_flags |= PF_STOPPED; 442 } else 443 pti->pt_flags &= ~PF_STOPPED; 444 pti->pt_send |= flush; 445 /* change of perspective */ 446 flag = 0; 447 if (flush & FREAD) 448 flag |= FWRITE; 449 if (flush & FWRITE) 450 flag |= FREAD; 451 ptcwakeup(tp, flag); 452 } 453 454 void 455 ptcwakeup(tp, flag) 456 struct tty *tp; 457 int flag; 458 { 459 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 460 461 if (flag & FREAD) { 462 selnotify(&pti->pt_selr, 0); 463 wakeup((caddr_t)&tp->t_outq.c_cf); 464 } 465 if (flag & FWRITE) { 466 selnotify(&pti->pt_selw, 0); 467 wakeup((caddr_t)&tp->t_rawq.c_cf); 468 } 469 } 470 471 /*ARGSUSED*/ 472 int 473 ptcopen(dev, flag, devtype, p) 474 dev_t dev; 475 int flag, devtype; 476 struct proc *p; 477 { 478 struct pt_softc *pti; 479 struct tty *tp; 480 int error; 481 482 if ((error = check_pty(dev))) 483 return (error); 484 485 pti = pt_softc[minor(dev)]; 486 tp = pti->pt_tty; 487 488 if (tp->t_oproc) 489 return (EIO); 490 tp->t_oproc = ptsstart; 491 (void)(*tp->t_linesw->l_modem)(tp, 1); 492 CLR(tp->t_lflag, EXTPROC); 493 pti->pt_flags = 0; 494 pti->pt_send = 0; 495 pti->pt_ucntl = 0; 496 return (0); 497 } 498 499 /*ARGSUSED*/ 500 int 501 ptcclose(dev, flag, devtype, p) 502 dev_t dev; 503 int flag, devtype; 504 struct proc *p; 505 { 506 struct pt_softc *pti = pt_softc[minor(dev)]; 507 struct tty *tp = pti->pt_tty; 508 509 (void)(*tp->t_linesw->l_modem)(tp, 0); 510 CLR(tp->t_state, TS_CARR_ON); 511 tp->t_oproc = 0; /* mark closed */ 512 return (0); 513 } 514 515 int 516 ptcread(dev, uio, flag) 517 dev_t dev; 518 struct uio *uio; 519 int flag; 520 { 521 struct pt_softc *pti = pt_softc[minor(dev)]; 522 struct tty *tp = pti->pt_tty; 523 char buf[BUFSIZ]; 524 int error = 0, cc; 525 526 /* 527 * We want to block until the slave 528 * is open, and there's something to read; 529 * but if we lost the slave or we're NBIO, 530 * then return the appropriate error instead. 531 */ 532 for (;;) { 533 if (ISSET(tp->t_state, TS_ISOPEN)) { 534 if (pti->pt_flags&PF_PKT && pti->pt_send) { 535 error = ureadc((int)pti->pt_send, uio); 536 if (error) 537 return (error); 538 if (pti->pt_send & TIOCPKT_IOCTL) { 539 cc = min(uio->uio_resid, 540 sizeof(tp->t_termios)); 541 uiomove((caddr_t) &tp->t_termios, 542 cc, uio); 543 } 544 pti->pt_send = 0; 545 return (0); 546 } 547 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 548 error = ureadc((int)pti->pt_ucntl, uio); 549 if (error) 550 return (error); 551 pti->pt_ucntl = 0; 552 return (0); 553 } 554 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 555 break; 556 } 557 if (!ISSET(tp->t_state, TS_CARR_ON)) 558 return (0); /* EOF */ 559 if (flag & IO_NDELAY) 560 return (EWOULDBLOCK); 561 error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH, 562 ttyin, 0); 563 if (error) 564 return (error); 565 } 566 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 567 error = ureadc(0, uio); 568 while (uio->uio_resid > 0 && error == 0) { 569 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 570 if (cc <= 0) 571 break; 572 error = uiomove(buf, cc, uio); 573 } 574 if (tp->t_outq.c_cc <= tp->t_lowat) { 575 if (ISSET(tp->t_state, TS_ASLEEP)) { 576 CLR(tp->t_state, TS_ASLEEP); 577 wakeup((caddr_t)&tp->t_outq); 578 } 579 selnotify(&tp->t_wsel, 0); 580 } 581 return (error); 582 } 583 584 585 int 586 ptcwrite(dev, uio, flag) 587 dev_t dev; 588 struct uio *uio; 589 int flag; 590 { 591 struct pt_softc *pti = pt_softc[minor(dev)]; 592 struct tty *tp = pti->pt_tty; 593 u_char *cp = NULL; 594 int cc = 0; 595 u_char locbuf[BUFSIZ]; 596 int cnt = 0; 597 int error = 0; 598 599 again: 600 if (!ISSET(tp->t_state, TS_ISOPEN)) 601 goto block; 602 if (pti->pt_flags & PF_REMOTE) { 603 if (tp->t_canq.c_cc) 604 goto block; 605 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 606 if (cc == 0) { 607 cc = min(uio->uio_resid, BUFSIZ); 608 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 609 cp = locbuf; 610 error = uiomove((caddr_t)cp, cc, uio); 611 if (error) 612 return (error); 613 /* check again for safety */ 614 if (!ISSET(tp->t_state, TS_ISOPEN)) 615 return (EIO); 616 } 617 if (cc) 618 (void) b_to_q((char *)cp, cc, &tp->t_canq); 619 cc = 0; 620 } 621 (void) putc(0, &tp->t_canq); 622 ttwakeup(tp); 623 wakeup((caddr_t)&tp->t_canq); 624 return (0); 625 } 626 while (uio->uio_resid > 0) { 627 if (cc == 0) { 628 cc = min(uio->uio_resid, BUFSIZ); 629 cp = locbuf; 630 error = uiomove((caddr_t)cp, cc, uio); 631 if (error) 632 return (error); 633 /* check again for safety */ 634 if (!ISSET(tp->t_state, TS_ISOPEN)) 635 return (EIO); 636 } 637 while (cc > 0) { 638 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 639 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_lflag, ICANON))) { 640 wakeup((caddr_t)&tp->t_rawq); 641 goto block; 642 } 643 (*tp->t_linesw->l_rint)(*cp++, tp); 644 cnt++; 645 cc--; 646 } 647 cc = 0; 648 } 649 return (0); 650 block: 651 /* 652 * Come here to wait for slave to open, for space 653 * in outq, or space in rawq. 654 */ 655 if (!ISSET(tp->t_state, TS_CARR_ON)) 656 return (EIO); 657 if (flag & IO_NDELAY) { 658 /* adjust for data copied in but not written */ 659 uio->uio_resid += cc; 660 if (cnt == 0) 661 return (EWOULDBLOCK); 662 return (0); 663 } 664 error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 665 ttyout, 0); 666 if (error) { 667 /* adjust for data copied in but not written */ 668 uio->uio_resid += cc; 669 return (error); 670 } 671 goto again; 672 } 673 674 int 675 ptcpoll(dev, events, p) 676 dev_t dev; 677 int events; 678 struct proc *p; 679 { 680 struct pt_softc *pti = pt_softc[minor(dev)]; 681 struct tty *tp = pti->pt_tty; 682 int revents = 0; 683 int s = splsoftclock(); 684 685 if (events & (POLLIN | POLLRDNORM)) 686 if (ISSET(tp->t_state, TS_ISOPEN) && 687 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 688 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 689 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 690 revents |= events & (POLLIN | POLLRDNORM); 691 692 if (events & (POLLOUT | POLLWRNORM)) 693 if (ISSET(tp->t_state, TS_ISOPEN) && 694 ((pti->pt_flags & PF_REMOTE) ? 695 (tp->t_canq.c_cc == 0) : 696 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 697 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))) 698 revents |= events & (POLLOUT | POLLWRNORM); 699 700 if (events & POLLHUP) 701 if (!ISSET(tp->t_state, TS_CARR_ON)) 702 revents |= POLLHUP; 703 704 if (revents == 0) { 705 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 706 selrecord(p, &pti->pt_selr); 707 708 if (events & (POLLOUT | POLLWRNORM)) 709 selrecord(p, &pti->pt_selw); 710 } 711 712 splx(s); 713 return (revents); 714 } 715 716 static void 717 filt_ptcrdetach(struct knote *kn) 718 { 719 struct pt_softc *pti; 720 int s; 721 722 pti = (void *) kn->kn_hook; 723 s = spltty(); 724 SLIST_REMOVE(&pti->pt_selr.si_klist, kn, knote, kn_selnext); 725 splx(s); 726 } 727 728 static int 729 filt_ptcread(struct knote *kn, long hint) 730 { 731 struct pt_softc *pti; 732 struct tty *tp; 733 int canread; 734 735 pti = (void *) kn->kn_hook; 736 tp = pti->pt_tty; 737 738 canread = (ISSET(tp->t_state, TS_ISOPEN) && 739 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 740 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 741 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))); 742 743 if (canread) { 744 /* 745 * XXXLUKEM - the below c_cc value is one more than 746 * the actual amount of data in tty queue - why? 747 */ 748 kn->kn_data = tp->t_outq.c_cc; 749 if (((pti->pt_flags & PF_PKT) && pti->pt_send) || 750 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)) 751 kn->kn_data++; 752 } 753 754 return (canread); 755 } 756 757 static void 758 filt_ptcwdetach(struct knote *kn) 759 { 760 struct pt_softc *pti; 761 int s; 762 763 pti = (void *) kn->kn_hook; 764 s = spltty(); 765 SLIST_REMOVE(&pti->pt_selw.si_klist, kn, knote, kn_selnext); 766 splx(s); 767 } 768 769 static int 770 filt_ptcwrite(struct knote *kn, long hint) 771 { 772 struct pt_softc *pti; 773 struct tty *tp; 774 int canwrite; 775 int nwrite; 776 777 pti = (void *) kn->kn_hook; 778 tp = pti->pt_tty; 779 780 canwrite = (ISSET(tp->t_state, TS_ISOPEN) && 781 ((pti->pt_flags & PF_REMOTE) ? 782 (tp->t_canq.c_cc == 0) : 783 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 784 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))); 785 786 if (canwrite) { 787 if (pti->pt_flags & PF_REMOTE) 788 nwrite = tp->t_canq.c_cn; 789 else { 790 /* this is guaranteed to be > 0 due to above check */ 791 nwrite = tp->t_canq.c_cn 792 - (tp->t_rawq.c_cc + tp->t_canq.c_cc); 793 } 794 kn->kn_data = nwrite; 795 } 796 797 return (canwrite); 798 } 799 800 static const struct filterops ptcread_filtops = 801 { 1, NULL, filt_ptcrdetach, filt_ptcread }; 802 static const struct filterops ptcwrite_filtops = 803 { 1, NULL, filt_ptcwdetach, filt_ptcwrite }; 804 805 int 806 ptckqfilter(dev_t dev, struct knote *kn) 807 { 808 struct pt_softc *pti = pt_softc[minor(dev)]; 809 struct klist *klist; 810 int s; 811 812 switch (kn->kn_filter) { 813 case EVFILT_READ: 814 klist = &pti->pt_selr.si_klist; 815 kn->kn_fop = &ptcread_filtops; 816 break; 817 case EVFILT_WRITE: 818 klist = &pti->pt_selw.si_klist; 819 kn->kn_fop = &ptcwrite_filtops; 820 break; 821 default: 822 return (1); 823 } 824 825 kn->kn_hook = (void *) pti; 826 827 s = spltty(); 828 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 829 splx(s); 830 831 return (0); 832 } 833 834 struct tty * 835 ptytty(dev) 836 dev_t dev; 837 { 838 struct pt_softc *pti = pt_softc[minor(dev)]; 839 struct tty *tp = pti->pt_tty; 840 841 return (tp); 842 } 843 844 /*ARGSUSED*/ 845 int 846 ptyioctl(dev, cmd, data, flag, p) 847 dev_t dev; 848 u_long cmd; 849 caddr_t data; 850 int flag; 851 struct proc *p; 852 { 853 struct pt_softc *pti = pt_softc[minor(dev)]; 854 struct tty *tp = pti->pt_tty; 855 u_char *cc = tp->t_cc; 856 int stop, error, sig; 857 858 /* 859 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 860 * ttywflush(tp) will hang if there are characters in the outq. 861 */ 862 if (cmd == TIOCEXT) { 863 /* 864 * When the EXTPROC bit is being toggled, we need 865 * to send an TIOCPKT_IOCTL if the packet driver 866 * is turned on. 867 */ 868 if (*(int *)data) { 869 if (pti->pt_flags & PF_PKT) { 870 pti->pt_send |= TIOCPKT_IOCTL; 871 ptcwakeup(tp, FREAD); 872 } 873 SET(tp->t_lflag, EXTPROC); 874 } else { 875 if (ISSET(tp->t_lflag, EXTPROC) && 876 (pti->pt_flags & PF_PKT)) { 877 pti->pt_send |= TIOCPKT_IOCTL; 878 ptcwakeup(tp, FREAD); 879 } 880 CLR(tp->t_lflag, EXTPROC); 881 } 882 return(0); 883 } else 884 if (cdevsw[major(dev)].d_open == ptcopen) 885 switch (cmd) { 886 887 case TIOCGPGRP: 888 /* 889 * We avoid calling ttioctl on the controller since, 890 * in that case, tp must be the controlling terminal. 891 */ 892 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 893 return (0); 894 895 case TIOCPKT: 896 if (*(int *)data) { 897 if (pti->pt_flags & PF_UCNTL) 898 return (EINVAL); 899 pti->pt_flags |= PF_PKT; 900 } else 901 pti->pt_flags &= ~PF_PKT; 902 return (0); 903 904 case TIOCUCNTL: 905 if (*(int *)data) { 906 if (pti->pt_flags & PF_PKT) 907 return (EINVAL); 908 pti->pt_flags |= PF_UCNTL; 909 } else 910 pti->pt_flags &= ~PF_UCNTL; 911 return (0); 912 913 case TIOCREMOTE: 914 if (*(int *)data) 915 pti->pt_flags |= PF_REMOTE; 916 else 917 pti->pt_flags &= ~PF_REMOTE; 918 ttyflush(tp, FREAD|FWRITE); 919 return (0); 920 921 #ifdef COMPAT_OLDTTY 922 case TIOCSETP: 923 case TIOCSETN: 924 #endif 925 case TIOCSETD: 926 case TIOCSETA: 927 case TIOCSETAW: 928 case TIOCSETAF: 929 ndflush(&tp->t_outq, tp->t_outq.c_cc); 930 break; 931 932 case TIOCSIG: 933 sig = (int)(long)*(caddr_t *)data; 934 if (sig <= 0 || sig >= NSIG) 935 return (EINVAL); 936 if (!ISSET(tp->t_lflag, NOFLSH)) 937 ttyflush(tp, FREAD|FWRITE); 938 if ((sig == SIGINFO) && 939 (!ISSET(tp->t_lflag, NOKERNINFO))) 940 ttyinfo(tp); 941 pgsignal(tp->t_pgrp, sig, 1); 942 return(0); 943 } 944 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 945 if (error == EPASSTHROUGH) 946 error = ttioctl(tp, cmd, data, flag, p); 947 if (error == EPASSTHROUGH) { 948 if (pti->pt_flags & PF_UCNTL && 949 (cmd & ~0xff) == UIOCCMD(0)) { 950 if (cmd & 0xff) { 951 pti->pt_ucntl = (u_char)cmd; 952 ptcwakeup(tp, FREAD); 953 } 954 return (0); 955 } 956 } 957 /* 958 * If external processing and packet mode send ioctl packet. 959 */ 960 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 961 switch(cmd) { 962 case TIOCSETA: 963 case TIOCSETAW: 964 case TIOCSETAF: 965 #ifdef COMPAT_OLDTTY 966 case TIOCSETP: 967 case TIOCSETN: 968 case TIOCSETC: 969 case TIOCSLTC: 970 case TIOCLBIS: 971 case TIOCLBIC: 972 case TIOCLSET: 973 #endif 974 pti->pt_send |= TIOCPKT_IOCTL; 975 ptcwakeup(tp, FREAD); 976 default: 977 break; 978 } 979 } 980 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 981 && CCEQ(cc[VSTART], CTRL('q')); 982 if (pti->pt_flags & PF_NOSTOP) { 983 if (stop) { 984 pti->pt_send &= ~TIOCPKT_NOSTOP; 985 pti->pt_send |= TIOCPKT_DOSTOP; 986 pti->pt_flags &= ~PF_NOSTOP; 987 ptcwakeup(tp, FREAD); 988 } 989 } else { 990 if (!stop) { 991 pti->pt_send &= ~TIOCPKT_DOSTOP; 992 pti->pt_send |= TIOCPKT_NOSTOP; 993 pti->pt_flags |= PF_NOSTOP; 994 ptcwakeup(tp, FREAD); 995 } 996 } 997 return (error); 998 } 999
Indexes created Tue Sep 30 20:09:53 GMT 2025