tty_pty.c revision 1.56.4.1
1 /* $NetBSD: tty_pty.c,v 1.56.4.1 2001/09/07 04:45:38 thorpej 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; 272 273 if ((error = check_pty(devvp->v_rdev))) 274 return (error); 275 276 pti = pt_softc[minor(devvp->v_rdev)]; 277 tp = pti->pt_tty; 278 devvp->v_devcookie = pti; 279 280 if (!ISSET(tp->t_state, TS_ISOPEN)) { 281 ttychars(tp); /* Set up default chars */ 282 tp->t_iflag = TTYDEF_IFLAG; 283 tp->t_oflag = TTYDEF_OFLAG; 284 tp->t_lflag = TTYDEF_LFLAG; 285 tp->t_cflag = TTYDEF_CFLAG; 286 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 287 ttsetwater(tp); /* would be done in xxparam() */ 288 } else if (ISSET(tp->t_state, TS_XCLUDE) && p->p_ucred->cr_uid != 0) 289 return (EBUSY); 290 if (tp->t_oproc) /* Ctrlr still around. */ 291 SET(tp->t_state, TS_CARR_ON); 292 if (!ISSET(flag, O_NONBLOCK)) 293 while (!ISSET(tp->t_state, TS_CARR_ON)) { 294 tp->t_wopen++; 295 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, 296 ttopen, 0); 297 tp->t_wopen--; 298 if (error) 299 return (error); 300 } 301 error = (*tp->t_linesw->l_open)(devvp, tp); 302 ptcwakeup(tp, FREAD|FWRITE); 303 return (error); 304 } 305 306 int 307 ptsclose(devvp, flag, mode, p) 308 struct vnode *devvp; 309 int flag, mode; 310 struct proc *p; 311 { 312 struct pt_softc *pti = devvp->v_devcookie; 313 struct tty *tp = pti->pt_tty; 314 int error; 315 316 error = (*tp->t_linesw->l_close)(tp, flag); 317 error |= ttyclose(tp); 318 ptcwakeup(tp, FREAD|FWRITE); 319 return (error); 320 } 321 322 int 323 ptsread(devvp, uio, flag) 324 struct vnode *devvp; 325 struct uio *uio; 326 int flag; 327 { 328 struct proc *p = curproc; 329 struct pt_softc *pti = devvp->v_devcookie; 330 struct tty *tp = pti->pt_tty; 331 int error = 0; 332 333 again: 334 if (pti->pt_flags & PF_REMOTE) { 335 while (isbackground(p, tp)) { 336 if (sigismasked(p, SIGTTIN) || 337 p->p_pgrp->pg_jobc == 0 || 338 p->p_flag & P_PPWAIT) 339 return (EIO); 340 pgsignal(p->p_pgrp, SIGTTIN, 1); 341 error = ttysleep(tp, (caddr_t)&lbolt, 342 TTIPRI | PCATCH, ttybg, 0); 343 if (error) 344 return (error); 345 } 346 if (tp->t_canq.c_cc == 0) { 347 if (flag & IO_NDELAY) 348 return (EWOULDBLOCK); 349 error = ttysleep(tp, (caddr_t)&tp->t_canq, 350 TTIPRI | PCATCH, ttyin, 0); 351 if (error) 352 return (error); 353 goto again; 354 } 355 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 356 if (ureadc(getc(&tp->t_canq), uio) < 0) { 357 error = EFAULT; 358 break; 359 } 360 if (tp->t_canq.c_cc == 1) 361 (void) getc(&tp->t_canq); 362 if (tp->t_canq.c_cc) 363 return (error); 364 } else 365 if (tp->t_oproc) 366 error = (*tp->t_linesw->l_read)(tp, uio, flag); 367 ptcwakeup(tp, FWRITE); 368 return (error); 369 } 370 371 /* 372 * Write to pseudo-tty. 373 * Wakeups of controlling tty will happen 374 * indirectly, when tty driver calls ptsstart. 375 */ 376 int 377 ptswrite(devvp, uio, flag) 378 struct vnode *devvp; 379 struct uio *uio; 380 int flag; 381 { 382 struct pt_softc *pti = devvp->v_devcookie; 383 struct tty *tp = pti->pt_tty; 384 385 if (tp->t_oproc == 0) 386 return (EIO); 387 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 388 } 389 390 /* 391 * Poll pseudo-tty. 392 */ 393 int 394 ptspoll(devvp, events, p) 395 struct vnode *devvp; 396 int events; 397 struct proc *p; 398 { 399 struct pt_softc *pti = devvp->v_devcookie; 400 struct tty *tp = pti->pt_tty; 401 402 if (tp->t_oproc == 0) 403 return (EIO); 404 405 return ((*tp->t_linesw->l_poll)(tp, events, p)); 406 } 407 408 /* 409 * Start output on pseudo-tty. 410 * Wake up process polling or sleeping for input from controlling tty. 411 */ 412 void 413 ptsstart(tp) 414 struct tty *tp; 415 { 416 struct pt_softc *pti = tp->t_devvp->v_devcookie; 417 418 if (ISSET(tp->t_state, TS_TTSTOP)) 419 return; 420 if (pti->pt_flags & PF_STOPPED) { 421 pti->pt_flags &= ~PF_STOPPED; 422 pti->pt_send = TIOCPKT_START; 423 } 424 ptcwakeup(tp, FREAD); 425 } 426 427 void 428 ptsstop(tp, flush) 429 struct tty *tp; 430 int flush; 431 { 432 struct pt_softc *pti = tp->t_devvp->v_devcookie; 433 int flag; 434 435 /* note: FLUSHREAD and FLUSHWRITE already ok */ 436 if (flush == 0) { 437 flush = TIOCPKT_STOP; 438 pti->pt_flags |= PF_STOPPED; 439 } else 440 pti->pt_flags &= ~PF_STOPPED; 441 pti->pt_send |= flush; 442 /* change of perspective */ 443 flag = 0; 444 if (flush & FREAD) 445 flag |= FWRITE; 446 if (flush & FWRITE) 447 flag |= FREAD; 448 ptcwakeup(tp, flag); 449 } 450 451 void 452 ptcwakeup(tp, flag) 453 struct tty *tp; 454 int flag; 455 { 456 struct pt_softc *pti = tp->t_devvp->v_devcookie; 457 458 if (flag & FREAD) { 459 selwakeup(&pti->pt_selr); 460 wakeup((caddr_t)&tp->t_outq.c_cf); 461 } 462 if (flag & FWRITE) { 463 selwakeup(&pti->pt_selw); 464 wakeup((caddr_t)&tp->t_rawq.c_cf); 465 } 466 } 467 468 /*ARGSUSED*/ 469 int 470 ptcopen(devvp, flag, devtype, p) 471 struct vnode *devvp; 472 int flag, devtype; 473 struct proc *p; 474 { 475 struct pt_softc *pti; 476 struct tty *tp; 477 int error; 478 479 if ((error = check_pty(devvp->v_rdev))) 480 return (error); 481 482 pti = pt_softc[minor(devvp->v_rdev)]; 483 tp = pti->pt_tty; 484 devvp->v_devcookie = pti; 485 486 if (tp->t_oproc) 487 return (EIO); 488 tp->t_oproc = ptsstart; 489 (void)(*tp->t_linesw->l_modem)(tp, 1); 490 CLR(tp->t_lflag, EXTPROC); 491 pti->pt_flags = 0; 492 pti->pt_send = 0; 493 pti->pt_ucntl = 0; 494 return (0); 495 } 496 497 /*ARGSUSED*/ 498 int 499 ptcclose(devvp, flag, devtype, p) 500 struct vnode *devvp; 501 int flag, devtype; 502 struct proc *p; 503 { 504 struct pt_softc *pti = devvp->v_devcookie; 505 struct tty *tp = pti->pt_tty; 506 507 (void)(*tp->t_linesw->l_modem)(tp, 0); 508 CLR(tp->t_state, TS_CARR_ON); 509 tp->t_oproc = 0; /* mark closed */ 510 return (0); 511 } 512 513 int 514 ptcread(devvp, uio, flag) 515 struct vnode *devvp; 516 struct uio *uio; 517 int flag; 518 { 519 struct pt_softc *pti = devvp->v_devcookie; 520 struct tty *tp = pti->pt_tty; 521 char buf[BUFSIZ]; 522 int error = 0, cc; 523 524 /* 525 * We want to block until the slave 526 * is open, and there's something to read; 527 * but if we lost the slave or we're NBIO, 528 * then return the appropriate error instead. 529 */ 530 for (;;) { 531 if (ISSET(tp->t_state, TS_ISOPEN)) { 532 if (pti->pt_flags&PF_PKT && pti->pt_send) { 533 error = ureadc((int)pti->pt_send, uio); 534 if (error) 535 return (error); 536 if (pti->pt_send & TIOCPKT_IOCTL) { 537 cc = min(uio->uio_resid, 538 sizeof(tp->t_termios)); 539 uiomove((caddr_t) &tp->t_termios, 540 cc, uio); 541 } 542 pti->pt_send = 0; 543 return (0); 544 } 545 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 546 error = ureadc((int)pti->pt_ucntl, uio); 547 if (error) 548 return (error); 549 pti->pt_ucntl = 0; 550 return (0); 551 } 552 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 553 break; 554 } 555 if (!ISSET(tp->t_state, TS_CARR_ON)) 556 return (0); /* EOF */ 557 if (flag & IO_NDELAY) 558 return (EWOULDBLOCK); 559 error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH, 560 ttyin, 0); 561 if (error) 562 return (error); 563 } 564 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 565 error = ureadc(0, uio); 566 while (uio->uio_resid > 0 && error == 0) { 567 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 568 if (cc <= 0) 569 break; 570 error = uiomove(buf, cc, uio); 571 } 572 if (tp->t_outq.c_cc <= tp->t_lowat) { 573 if (ISSET(tp->t_state, TS_ASLEEP)) { 574 CLR(tp->t_state, TS_ASLEEP); 575 wakeup((caddr_t)&tp->t_outq); 576 } 577 selwakeup(&tp->t_wsel); 578 } 579 return (error); 580 } 581 582 583 int 584 ptcwrite(devvp, uio, flag) 585 struct vnode *devvp; 586 struct uio *uio; 587 int flag; 588 { 589 struct pt_softc *pti = devvp->v_devcookie; 590 struct tty *tp = pti->pt_tty; 591 u_char *cp = NULL; 592 int cc = 0; 593 u_char locbuf[BUFSIZ]; 594 int cnt = 0; 595 int error = 0; 596 597 again: 598 if (!ISSET(tp->t_state, TS_ISOPEN)) 599 goto block; 600 if (pti->pt_flags & PF_REMOTE) { 601 if (tp->t_canq.c_cc) 602 goto block; 603 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 604 if (cc == 0) { 605 cc = min(uio->uio_resid, BUFSIZ); 606 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 607 cp = locbuf; 608 error = uiomove((caddr_t)cp, cc, uio); 609 if (error) 610 return (error); 611 /* check again for safety */ 612 if (!ISSET(tp->t_state, TS_ISOPEN)) 613 return (EIO); 614 } 615 if (cc) 616 (void) b_to_q((char *)cp, cc, &tp->t_canq); 617 cc = 0; 618 } 619 (void) putc(0, &tp->t_canq); 620 ttwakeup(tp); 621 wakeup((caddr_t)&tp->t_canq); 622 return (0); 623 } 624 while (uio->uio_resid > 0) { 625 if (cc == 0) { 626 cc = min(uio->uio_resid, BUFSIZ); 627 cp = locbuf; 628 error = uiomove((caddr_t)cp, cc, uio); 629 if (error) 630 return (error); 631 /* check again for safety */ 632 if (!ISSET(tp->t_state, TS_ISOPEN)) 633 return (EIO); 634 } 635 while (cc > 0) { 636 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 637 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_iflag, ICANON))) { 638 wakeup((caddr_t)&tp->t_rawq); 639 goto block; 640 } 641 (*tp->t_linesw->l_rint)(*cp++, tp); 642 cnt++; 643 cc--; 644 } 645 cc = 0; 646 } 647 return (0); 648 block: 649 /* 650 * Come here to wait for slave to open, for space 651 * in outq, or space in rawq. 652 */ 653 if (!ISSET(tp->t_state, TS_CARR_ON)) 654 return (EIO); 655 if (flag & IO_NDELAY) { 656 /* adjust for data copied in but not written */ 657 uio->uio_resid += cc; 658 if (cnt == 0) 659 return (EWOULDBLOCK); 660 return (0); 661 } 662 error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 663 ttyout, 0); 664 if (error) { 665 /* adjust for data copied in but not written */ 666 uio->uio_resid += cc; 667 return (error); 668 } 669 goto again; 670 } 671 672 int 673 ptcpoll(devvp, events, p) 674 struct vnode *devvp; 675 int events; 676 struct proc *p; 677 { 678 struct pt_softc *pti = devvp->v_devcookie; 679 struct tty *tp = pti->pt_tty; 680 int revents = 0; 681 int s = splsoftclock(); 682 683 if (events & (POLLIN | POLLRDNORM)) 684 if (ISSET(tp->t_state, TS_ISOPEN) && 685 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 686 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 687 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 688 revents |= events & (POLLIN | POLLRDNORM); 689 690 if (events & (POLLOUT | POLLWRNORM)) 691 if (ISSET(tp->t_state, TS_ISOPEN) && 692 ((pti->pt_flags & PF_REMOTE) ? 693 (tp->t_canq.c_cc == 0) : 694 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 695 (tp->t_canq.c_cc == 0 && ISSET(tp->t_iflag, ICANON))))) 696 revents |= events & (POLLOUT | POLLWRNORM); 697 698 if (events & POLLHUP) 699 if (!ISSET(tp->t_state, TS_CARR_ON)) 700 revents |= POLLHUP; 701 702 if (revents == 0) { 703 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 704 selrecord(p, &pti->pt_selr); 705 706 if (events & (POLLOUT | POLLWRNORM)) 707 selrecord(p, &pti->pt_selw); 708 } 709 710 splx(s); 711 return (revents); 712 } 713 714 715 struct tty * 716 ptytty(devvp) 717 struct vnode *devvp; 718 { 719 struct pt_softc *pti = devvp->v_devcookie; 720 struct tty *tp = pti->pt_tty; 721 722 return (tp); 723 } 724 725 /*ARGSUSED*/ 726 int 727 ptyioctl(devvp, cmd, data, flag, p) 728 struct vnode *devvp; 729 u_long cmd; 730 caddr_t data; 731 int flag; 732 struct proc *p; 733 { 734 struct pt_softc *pti = devvp->v_devcookie; 735 struct tty *tp = pti->pt_tty; 736 u_char *cc = tp->t_cc; 737 int stop, error, sig; 738 739 /* 740 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 741 * ttywflush(tp) will hang if there are characters in the outq. 742 */ 743 if (cmd == TIOCEXT) { 744 /* 745 * When the EXTPROC bit is being toggled, we need 746 * to send an TIOCPKT_IOCTL if the packet driver 747 * is turned on. 748 */ 749 if (*(int *)data) { 750 if (pti->pt_flags & PF_PKT) { 751 pti->pt_send |= TIOCPKT_IOCTL; 752 ptcwakeup(tp, FREAD); 753 } 754 SET(tp->t_lflag, EXTPROC); 755 } else { 756 if (ISSET(tp->t_lflag, EXTPROC) && 757 (pti->pt_flags & PF_PKT)) { 758 pti->pt_send |= TIOCPKT_IOCTL; 759 ptcwakeup(tp, FREAD); 760 } 761 CLR(tp->t_lflag, EXTPROC); 762 } 763 return(0); 764 } else 765 if (cdevsw[major(devvp->v_rdev)].d_open == ptcopen) 766 switch (cmd) { 767 768 case TIOCGPGRP: 769 #ifdef COMPAT_SUNOS 770 { 771 /* 772 * I'm not sure about SunOS TIOCGPGRP semantics 773 * on PTYs, but it's something like this: 774 */ 775 extern struct emul emul_sunos; 776 if (p->p_emul == &emul_sunos && tp->t_pgrp == 0) 777 return (EIO); 778 *(int *)data = tp->t_pgrp->pg_id; 779 return (0); 780 } 781 #endif 782 /* 783 * We avoid calling ttioctl on the controller since, 784 * in that case, tp must be the controlling terminal. 785 */ 786 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 787 return (0); 788 789 case TIOCPKT: 790 if (*(int *)data) { 791 if (pti->pt_flags & PF_UCNTL) 792 return (EINVAL); 793 pti->pt_flags |= PF_PKT; 794 } else 795 pti->pt_flags &= ~PF_PKT; 796 return (0); 797 798 case TIOCUCNTL: 799 if (*(int *)data) { 800 if (pti->pt_flags & PF_PKT) 801 return (EINVAL); 802 pti->pt_flags |= PF_UCNTL; 803 } else 804 pti->pt_flags &= ~PF_UCNTL; 805 return (0); 806 807 case TIOCREMOTE: 808 if (*(int *)data) 809 pti->pt_flags |= PF_REMOTE; 810 else 811 pti->pt_flags &= ~PF_REMOTE; 812 ttyflush(tp, FREAD|FWRITE); 813 return (0); 814 815 #ifdef COMPAT_OLDTTY 816 case TIOCSETP: 817 case TIOCSETN: 818 #endif 819 case TIOCSETD: 820 case TIOCSETA: 821 case TIOCSETAW: 822 case TIOCSETAF: 823 ndflush(&tp->t_outq, tp->t_outq.c_cc); 824 break; 825 826 case TIOCSIG: 827 sig = (int)(long)*(caddr_t *)data; 828 if (sig <= 0 || sig >= NSIG) 829 return (EINVAL); 830 if (!ISSET(tp->t_lflag, NOFLSH)) 831 ttyflush(tp, FREAD|FWRITE); 832 pgsignal(tp->t_pgrp, sig, 1); 833 if ((sig == SIGINFO) && 834 (!ISSET(tp->t_lflag, NOKERNINFO))) 835 ttyinfo(tp); 836 return(0); 837 } 838 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 839 if (error < 0) 840 error = ttioctl(tp, cmd, data, flag, p); 841 if (error < 0) { 842 if (pti->pt_flags & PF_UCNTL && 843 (cmd & ~0xff) == UIOCCMD(0)) { 844 if (cmd & 0xff) { 845 pti->pt_ucntl = (u_char)cmd; 846 ptcwakeup(tp, FREAD); 847 } 848 return (0); 849 } 850 error = ENOTTY; 851 } 852 /* 853 * If external processing and packet mode send ioctl packet. 854 */ 855 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 856 switch(cmd) { 857 case TIOCSETA: 858 case TIOCSETAW: 859 case TIOCSETAF: 860 #ifdef COMPAT_OLDTTY 861 case TIOCSETP: 862 case TIOCSETN: 863 case TIOCSETC: 864 case TIOCSLTC: 865 case TIOCLBIS: 866 case TIOCLBIC: 867 case TIOCLSET: 868 #endif 869 pti->pt_send |= TIOCPKT_IOCTL; 870 ptcwakeup(tp, FREAD); 871 default: 872 break; 873 } 874 } 875 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 876 && CCEQ(cc[VSTART], CTRL('q')); 877 if (pti->pt_flags & PF_NOSTOP) { 878 if (stop) { 879 pti->pt_send &= ~TIOCPKT_NOSTOP; 880 pti->pt_send |= TIOCPKT_DOSTOP; 881 pti->pt_flags &= ~PF_NOSTOP; 882 ptcwakeup(tp, FREAD); 883 } 884 } else { 885 if (!stop) { 886 pti->pt_send &= ~TIOCPKT_DOSTOP; 887 pti->pt_send |= TIOCPKT_NOSTOP; 888 pti->pt_flags |= PF_NOSTOP; 889 ptcwakeup(tp, FREAD); 890 } 891 } 892 return (error); 893 } 894
Indexes created Tue Sep 30 20:09:53 GMT 2025