tty_pty.c revision 1.49
1 /* $NetBSD: tty_pty.c,v 1.49 2000/09/11 13:51:29 pk 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 #define DEFAULT_NPTYS 16 /* default number of initial ptys */ 61 #define DEFAULT_MAXPTYS 256 /* default maximum number of ptys */ 62 63 /* Macros to clear/set/test flags. */ 64 #define SET(t, f) (t) |= (f) 65 #define CLR(t, f) (t) &= ~((unsigned)(f)) 66 #define ISSET(t, f) ((t) & (f)) 67 68 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 69 70 /* 71 * pts == /dev/tty[pqrs]? 72 * ptc == /dev/pty[pqrs]? 73 */ 74 struct pt_softc { 75 struct tty *pt_tty; 76 int pt_flags; 77 struct selinfo pt_selr, pt_selw; 78 u_char pt_send; 79 u_char pt_ucntl; 80 }; 81 82 static struct pt_softc **pt_softc = NULL; /* pty array */ 83 static int npty = 0; /* for pstat -t */ 84 static int maxptys = DEFAULT_MAXPTYS; /* maximum number of ptys (sysctable) */ 85 86 #if defined(MULTIPROCESSOR) || defined(LOCKDEBUG) 87 static struct simplelock pt_softc_mutex = SIMPLELOCK_INITIALIZER; 88 #endif 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 simple_unlock(&pt_softc_mutex); 139 return (ENXIO); 140 } 141 142 /* 143 * Now grab the pty array mutex - we need to ensure 144 * that the pty array is consistent while copying it's 145 * content to newly allocated, larger space; we also 146 * need to be safe against pty_maxptys(). 147 */ 148 simple_lock(&pt_softc_mutex); 149 150 do { 151 for(newnpty = npty; newnpty <= minor(dev); 152 newnpty *= 2); 153 154 if (newnpty > maxptys) 155 newnpty = maxptys; 156 157 simple_unlock(&pt_softc_mutex); 158 newpt = ptyarralloc(newnpty); 159 simple_lock(&pt_softc_mutex); 160 161 if (maxptys == npty) { 162 /* we hold the mutex here */ 163 goto limit_reached; 164 } 165 } while(newnpty > maxptys); 166 167 /* 168 * If the pty array was not enlarged while we were waiting 169 * for mutex, copy current contents of pt_softc[] to newly 170 * allocated array and start using the new bigger array. 171 */ 172 if (minor(dev) >= npty) { 173 memcpy(newpt, pt_softc, npty*sizeof(struct pt_softc *)); 174 free(pt_softc, M_DEVBUF); 175 176 pt_softc = newpt; 177 npty = newnpty; 178 } else { 179 /* was enlarged when waited fot lock, free new space */ 180 free(newpt, M_DEVBUF); 181 } 182 183 simple_unlock(&pt_softc_mutex); 184 } 185 186 /* 187 * If the entry is not yet allocated, allocate one. The mutex is 188 * needed so that the state of pt_softc[] array is consistant 189 * in case it has been longened above. 190 */ 191 if (!pt_softc[minor(dev)]) { 192 MALLOC(pti, struct pt_softc *, sizeof(struct pt_softc), 193 M_DEVBUF, M_WAITOK); 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 = (*linesw[tp->t_line].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 = (*linesw[tp->t_line].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 (sigismember(&p->p_sigignore, SIGTTIN) || 340 sigismember(&p->p_sigmask, SIGTTIN) || 341 p->p_pgrp->pg_jobc == 0 || 342 p->p_flag & P_PPWAIT) 343 return (EIO); 344 pgsignal(p->p_pgrp, SIGTTIN, 1); 345 error = ttysleep(tp, (caddr_t)&lbolt, 346 TTIPRI | PCATCH, ttybg, 0); 347 if (error) 348 return (error); 349 } 350 if (tp->t_canq.c_cc == 0) { 351 if (flag & IO_NDELAY) 352 return (EWOULDBLOCK); 353 error = ttysleep(tp, (caddr_t)&tp->t_canq, 354 TTIPRI | PCATCH, ttyin, 0); 355 if (error) 356 return (error); 357 goto again; 358 } 359 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 360 if (ureadc(getc(&tp->t_canq), uio) < 0) { 361 error = EFAULT; 362 break; 363 } 364 if (tp->t_canq.c_cc == 1) 365 (void) getc(&tp->t_canq); 366 if (tp->t_canq.c_cc) 367 return (error); 368 } else 369 if (tp->t_oproc) 370 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 371 ptcwakeup(tp, FWRITE); 372 return (error); 373 } 374 375 /* 376 * Write to pseudo-tty. 377 * Wakeups of controlling tty will happen 378 * indirectly, when tty driver calls ptsstart. 379 */ 380 int 381 ptswrite(dev, uio, flag) 382 dev_t dev; 383 struct uio *uio; 384 int flag; 385 { 386 struct pt_softc *pti = pt_softc[minor(dev)]; 387 struct tty *tp = pti->pt_tty; 388 389 if (tp->t_oproc == 0) 390 return (EIO); 391 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 392 } 393 394 /* 395 * Start output on pseudo-tty. 396 * Wake up process polling or sleeping for input from controlling tty. 397 */ 398 void 399 ptsstart(tp) 400 struct tty *tp; 401 { 402 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 403 404 if (ISSET(tp->t_state, TS_TTSTOP)) 405 return; 406 if (pti->pt_flags & PF_STOPPED) { 407 pti->pt_flags &= ~PF_STOPPED; 408 pti->pt_send = TIOCPKT_START; 409 } 410 ptcwakeup(tp, FREAD); 411 } 412 413 void 414 ptsstop(tp, flush) 415 struct tty *tp; 416 int flush; 417 { 418 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 419 int flag; 420 421 /* note: FLUSHREAD and FLUSHWRITE already ok */ 422 if (flush == 0) { 423 flush = TIOCPKT_STOP; 424 pti->pt_flags |= PF_STOPPED; 425 } else 426 pti->pt_flags &= ~PF_STOPPED; 427 pti->pt_send |= flush; 428 /* change of perspective */ 429 flag = 0; 430 if (flush & FREAD) 431 flag |= FWRITE; 432 if (flush & FWRITE) 433 flag |= FREAD; 434 ptcwakeup(tp, flag); 435 } 436 437 void 438 ptcwakeup(tp, flag) 439 struct tty *tp; 440 int flag; 441 { 442 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 443 444 if (flag & FREAD) { 445 selwakeup(&pti->pt_selr); 446 wakeup((caddr_t)&tp->t_outq.c_cf); 447 } 448 if (flag & FWRITE) { 449 selwakeup(&pti->pt_selw); 450 wakeup((caddr_t)&tp->t_rawq.c_cf); 451 } 452 } 453 454 /*ARGSUSED*/ 455 int 456 ptcopen(dev, flag, devtype, p) 457 dev_t dev; 458 int flag, devtype; 459 struct proc *p; 460 { 461 struct pt_softc *pti; 462 struct tty *tp; 463 int error; 464 465 if ((error = check_pty(dev))) 466 return (error); 467 468 pti = pt_softc[minor(dev)]; 469 tp = pti->pt_tty; 470 471 if (tp->t_oproc) 472 return (EIO); 473 tp->t_oproc = ptsstart; 474 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 475 CLR(tp->t_lflag, EXTPROC); 476 pti->pt_flags = 0; 477 pti->pt_send = 0; 478 pti->pt_ucntl = 0; 479 return (0); 480 } 481 482 /*ARGSUSED*/ 483 int 484 ptcclose(dev, flag, devtype, p) 485 dev_t dev; 486 int flag, devtype; 487 struct proc *p; 488 { 489 struct pt_softc *pti = pt_softc[minor(dev)]; 490 struct tty *tp = pti->pt_tty; 491 492 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 493 CLR(tp->t_state, TS_CARR_ON); 494 tp->t_oproc = 0; /* mark closed */ 495 return (0); 496 } 497 498 int 499 ptcread(dev, uio, flag) 500 dev_t dev; 501 struct uio *uio; 502 int flag; 503 { 504 struct pt_softc *pti = pt_softc[minor(dev)]; 505 struct tty *tp = pti->pt_tty; 506 char buf[BUFSIZ]; 507 int error = 0, cc; 508 509 /* 510 * We want to block until the slave 511 * is open, and there's something to read; 512 * but if we lost the slave or we're NBIO, 513 * then return the appropriate error instead. 514 */ 515 for (;;) { 516 if (ISSET(tp->t_state, TS_ISOPEN)) { 517 if (pti->pt_flags&PF_PKT && pti->pt_send) { 518 error = ureadc((int)pti->pt_send, uio); 519 if (error) 520 return (error); 521 if (pti->pt_send & TIOCPKT_IOCTL) { 522 cc = min(uio->uio_resid, 523 sizeof(tp->t_termios)); 524 uiomove((caddr_t) &tp->t_termios, 525 cc, uio); 526 } 527 pti->pt_send = 0; 528 return (0); 529 } 530 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 531 error = ureadc((int)pti->pt_ucntl, uio); 532 if (error) 533 return (error); 534 pti->pt_ucntl = 0; 535 return (0); 536 } 537 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 538 break; 539 } 540 if (!ISSET(tp->t_state, TS_CARR_ON)) 541 return (0); /* EOF */ 542 if (flag & IO_NDELAY) 543 return (EWOULDBLOCK); 544 error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH, 545 ttyin, 0); 546 if (error) 547 return (error); 548 } 549 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 550 error = ureadc(0, uio); 551 while (uio->uio_resid > 0 && error == 0) { 552 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 553 if (cc <= 0) 554 break; 555 error = uiomove(buf, cc, uio); 556 } 557 if (tp->t_outq.c_cc <= tp->t_lowat) { 558 if (ISSET(tp->t_state, TS_ASLEEP)) { 559 CLR(tp->t_state, TS_ASLEEP); 560 wakeup((caddr_t)&tp->t_outq); 561 } 562 selwakeup(&tp->t_wsel); 563 } 564 return (error); 565 } 566 567 568 int 569 ptcwrite(dev, uio, flag) 570 dev_t dev; 571 struct uio *uio; 572 int flag; 573 { 574 struct pt_softc *pti = pt_softc[minor(dev)]; 575 struct tty *tp = pti->pt_tty; 576 u_char *cp = NULL; 577 int cc = 0; 578 u_char locbuf[BUFSIZ]; 579 int cnt = 0; 580 int error = 0; 581 582 again: 583 if (!ISSET(tp->t_state, TS_ISOPEN)) 584 goto block; 585 if (pti->pt_flags & PF_REMOTE) { 586 if (tp->t_canq.c_cc) 587 goto block; 588 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 589 if (cc == 0) { 590 cc = min(uio->uio_resid, BUFSIZ); 591 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 592 cp = locbuf; 593 error = uiomove((caddr_t)cp, cc, uio); 594 if (error) 595 return (error); 596 /* check again for safety */ 597 if (!ISSET(tp->t_state, TS_ISOPEN)) 598 return (EIO); 599 } 600 if (cc) 601 (void) b_to_q((char *)cp, cc, &tp->t_canq); 602 cc = 0; 603 } 604 (void) putc(0, &tp->t_canq); 605 ttwakeup(tp); 606 wakeup((caddr_t)&tp->t_canq); 607 return (0); 608 } 609 while (uio->uio_resid > 0) { 610 if (cc == 0) { 611 cc = min(uio->uio_resid, BUFSIZ); 612 cp = locbuf; 613 error = uiomove((caddr_t)cp, cc, uio); 614 if (error) 615 return (error); 616 /* check again for safety */ 617 if (!ISSET(tp->t_state, TS_ISOPEN)) 618 return (EIO); 619 } 620 while (cc > 0) { 621 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 622 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_iflag, ICANON))) { 623 wakeup((caddr_t)&tp->t_rawq); 624 goto block; 625 } 626 (*linesw[tp->t_line].l_rint)(*cp++, tp); 627 cnt++; 628 cc--; 629 } 630 cc = 0; 631 } 632 return (0); 633 block: 634 /* 635 * Come here to wait for slave to open, for space 636 * in outq, or space in rawq. 637 */ 638 if (!ISSET(tp->t_state, TS_CARR_ON)) 639 return (EIO); 640 if (flag & IO_NDELAY) { 641 /* adjust for data copied in but not written */ 642 uio->uio_resid += cc; 643 if (cnt == 0) 644 return (EWOULDBLOCK); 645 return (0); 646 } 647 error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 648 ttyout, 0); 649 if (error) { 650 /* adjust for data copied in but not written */ 651 uio->uio_resid += cc; 652 return (error); 653 } 654 goto again; 655 } 656 657 int 658 ptcpoll(dev, events, p) 659 dev_t dev; 660 int events; 661 struct proc *p; 662 { 663 struct pt_softc *pti = pt_softc[minor(dev)]; 664 struct tty *tp = pti->pt_tty; 665 int revents = 0; 666 int s = splsoftclock(); 667 668 if (events & (POLLIN | POLLRDNORM)) 669 if (ISSET(tp->t_state, TS_ISOPEN) && 670 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 671 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 672 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 673 revents |= events & (POLLIN | POLLRDNORM); 674 675 if (events & (POLLOUT | POLLWRNORM)) 676 if (ISSET(tp->t_state, TS_ISOPEN) && 677 ((pti->pt_flags & PF_REMOTE) ? 678 (tp->t_canq.c_cc == 0) : 679 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 680 (tp->t_canq.c_cc == 0 && ISSET(tp->t_iflag, ICANON))))) 681 revents |= events & (POLLOUT | POLLWRNORM); 682 683 if (events & POLLHUP) 684 if (!ISSET(tp->t_state, TS_CARR_ON)) 685 revents |= POLLHUP; 686 687 if (revents == 0) { 688 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 689 selrecord(p, &pti->pt_selr); 690 691 if (events & (POLLOUT | POLLWRNORM)) 692 selrecord(p, &pti->pt_selw); 693 } 694 695 splx(s); 696 return (revents); 697 } 698 699 700 struct tty * 701 ptytty(dev) 702 dev_t dev; 703 { 704 struct pt_softc *pti = pt_softc[minor(dev)]; 705 struct tty *tp = pti->pt_tty; 706 707 return (tp); 708 } 709 710 /*ARGSUSED*/ 711 int 712 ptyioctl(dev, cmd, data, flag, p) 713 dev_t dev; 714 u_long cmd; 715 caddr_t data; 716 int flag; 717 struct proc *p; 718 { 719 struct pt_softc *pti = pt_softc[minor(dev)]; 720 struct tty *tp = pti->pt_tty; 721 u_char *cc = tp->t_cc; 722 int stop, error, sig; 723 724 /* 725 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 726 * ttywflush(tp) will hang if there are characters in the outq. 727 */ 728 if (cmd == TIOCEXT) { 729 /* 730 * When the EXTPROC bit is being toggled, we need 731 * to send an TIOCPKT_IOCTL if the packet driver 732 * is turned on. 733 */ 734 if (*(int *)data) { 735 if (pti->pt_flags & PF_PKT) { 736 pti->pt_send |= TIOCPKT_IOCTL; 737 ptcwakeup(tp, FREAD); 738 } 739 SET(tp->t_lflag, EXTPROC); 740 } else { 741 if (ISSET(tp->t_lflag, EXTPROC) && 742 (pti->pt_flags & PF_PKT)) { 743 pti->pt_send |= TIOCPKT_IOCTL; 744 ptcwakeup(tp, FREAD); 745 } 746 CLR(tp->t_lflag, EXTPROC); 747 } 748 return(0); 749 } else 750 if (cdevsw[major(dev)].d_open == ptcopen) 751 switch (cmd) { 752 753 case TIOCGPGRP: 754 #ifdef COMPAT_SUNOS 755 { 756 /* 757 * I'm not sure about SunOS TIOCGPGRP semantics 758 * on PTYs, but it's something like this: 759 */ 760 extern struct emul emul_sunos; 761 if (p->p_emul == &emul_sunos && tp->t_pgrp == 0) 762 return (EIO); 763 *(int *)data = tp->t_pgrp->pg_id; 764 return (0); 765 } 766 #endif 767 /* 768 * We avoid calling ttioctl on the controller since, 769 * in that case, tp must be the controlling terminal. 770 */ 771 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 772 return (0); 773 774 case TIOCPKT: 775 if (*(int *)data) { 776 if (pti->pt_flags & PF_UCNTL) 777 return (EINVAL); 778 pti->pt_flags |= PF_PKT; 779 } else 780 pti->pt_flags &= ~PF_PKT; 781 return (0); 782 783 case TIOCUCNTL: 784 if (*(int *)data) { 785 if (pti->pt_flags & PF_PKT) 786 return (EINVAL); 787 pti->pt_flags |= PF_UCNTL; 788 } else 789 pti->pt_flags &= ~PF_UCNTL; 790 return (0); 791 792 case TIOCREMOTE: 793 if (*(int *)data) 794 pti->pt_flags |= PF_REMOTE; 795 else 796 pti->pt_flags &= ~PF_REMOTE; 797 ttyflush(tp, FREAD|FWRITE); 798 return (0); 799 800 #ifdef COMPAT_OLDTTY 801 case TIOCSETP: 802 case TIOCSETN: 803 #endif 804 case TIOCSETD: 805 case TIOCSETA: 806 case TIOCSETAW: 807 case TIOCSETAF: 808 ndflush(&tp->t_outq, tp->t_outq.c_cc); 809 break; 810 811 case TIOCSIG: 812 sig = (int)(long)*(caddr_t *)data; 813 if (sig <= 0 || sig >= NSIG) 814 return (EINVAL); 815 if (!ISSET(tp->t_lflag, NOFLSH)) 816 ttyflush(tp, FREAD|FWRITE); 817 pgsignal(tp->t_pgrp, sig, 1); 818 if ((sig == SIGINFO) && 819 (!ISSET(tp->t_lflag, NOKERNINFO))) 820 ttyinfo(tp); 821 return(0); 822 } 823 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 824 if (error < 0) 825 error = ttioctl(tp, cmd, data, flag, p); 826 if (error < 0) { 827 if (pti->pt_flags & PF_UCNTL && 828 (cmd & ~0xff) == UIOCCMD(0)) { 829 if (cmd & 0xff) { 830 pti->pt_ucntl = (u_char)cmd; 831 ptcwakeup(tp, FREAD); 832 } 833 return (0); 834 } 835 error = ENOTTY; 836 } 837 /* 838 * If external processing and packet mode send ioctl packet. 839 */ 840 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 841 switch(cmd) { 842 case TIOCSETA: 843 case TIOCSETAW: 844 case TIOCSETAF: 845 #ifdef COMPAT_OLDTTY 846 case TIOCSETP: 847 case TIOCSETN: 848 case TIOCSETC: 849 case TIOCSLTC: 850 case TIOCLBIS: 851 case TIOCLBIC: 852 case TIOCLSET: 853 #endif 854 pti->pt_send |= TIOCPKT_IOCTL; 855 ptcwakeup(tp, FREAD); 856 default: 857 break; 858 } 859 } 860 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 861 && CCEQ(cc[VSTART], CTRL('q')); 862 if (pti->pt_flags & PF_NOSTOP) { 863 if (stop) { 864 pti->pt_send &= ~TIOCPKT_NOSTOP; 865 pti->pt_send |= TIOCPKT_DOSTOP; 866 pti->pt_flags &= ~PF_NOSTOP; 867 ptcwakeup(tp, FREAD); 868 } 869 } else { 870 if (!stop) { 871 pti->pt_send &= ~TIOCPKT_DOSTOP; 872 pti->pt_send |= TIOCPKT_NOSTOP; 873 pti->pt_flags |= PF_NOSTOP; 874 ptcwakeup(tp, FREAD); 875 } 876 } 877 return (error); 878 } 879
Indexes created Wed Sep 24 15:09:51 GMT 2025