tty_pty.c revision 1.51
1 /* $NetBSD: tty_pty.c,v 1.51 2000/11/05 15:37:09 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 "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 = (*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 * Start output on pseudo-tty. 395 * Wake up process polling or sleeping for input from controlling tty. 396 */ 397 void 398 ptsstart(tp) 399 struct tty *tp; 400 { 401 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 402 403 if (ISSET(tp->t_state, TS_TTSTOP)) 404 return; 405 if (pti->pt_flags & PF_STOPPED) { 406 pti->pt_flags &= ~PF_STOPPED; 407 pti->pt_send = TIOCPKT_START; 408 } 409 ptcwakeup(tp, FREAD); 410 } 411 412 void 413 ptsstop(tp, flush) 414 struct tty *tp; 415 int flush; 416 { 417 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 418 int flag; 419 420 /* note: FLUSHREAD and FLUSHWRITE already ok */ 421 if (flush == 0) { 422 flush = TIOCPKT_STOP; 423 pti->pt_flags |= PF_STOPPED; 424 } else 425 pti->pt_flags &= ~PF_STOPPED; 426 pti->pt_send |= flush; 427 /* change of perspective */ 428 flag = 0; 429 if (flush & FREAD) 430 flag |= FWRITE; 431 if (flush & FWRITE) 432 flag |= FREAD; 433 ptcwakeup(tp, flag); 434 } 435 436 void 437 ptcwakeup(tp, flag) 438 struct tty *tp; 439 int flag; 440 { 441 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 442 443 if (flag & FREAD) { 444 selwakeup(&pti->pt_selr); 445 wakeup((caddr_t)&tp->t_outq.c_cf); 446 } 447 if (flag & FWRITE) { 448 selwakeup(&pti->pt_selw); 449 wakeup((caddr_t)&tp->t_rawq.c_cf); 450 } 451 } 452 453 /*ARGSUSED*/ 454 int 455 ptcopen(dev, flag, devtype, p) 456 dev_t dev; 457 int flag, devtype; 458 struct proc *p; 459 { 460 struct pt_softc *pti; 461 struct tty *tp; 462 int error; 463 464 if ((error = check_pty(dev))) 465 return (error); 466 467 pti = pt_softc[minor(dev)]; 468 tp = pti->pt_tty; 469 470 if (tp->t_oproc) 471 return (EIO); 472 tp->t_oproc = ptsstart; 473 (void)(*tp->t_linesw->l_modem)(tp, 1); 474 CLR(tp->t_lflag, EXTPROC); 475 pti->pt_flags = 0; 476 pti->pt_send = 0; 477 pti->pt_ucntl = 0; 478 return (0); 479 } 480 481 /*ARGSUSED*/ 482 int 483 ptcclose(dev, flag, devtype, p) 484 dev_t dev; 485 int flag, devtype; 486 struct proc *p; 487 { 488 struct pt_softc *pti = pt_softc[minor(dev)]; 489 struct tty *tp = pti->pt_tty; 490 491 (void)(*tp->t_linesw->l_modem)(tp, 0); 492 CLR(tp->t_state, TS_CARR_ON); 493 tp->t_oproc = 0; /* mark closed */ 494 return (0); 495 } 496 497 int 498 ptcread(dev, uio, flag) 499 dev_t dev; 500 struct uio *uio; 501 int flag; 502 { 503 struct pt_softc *pti = pt_softc[minor(dev)]; 504 struct tty *tp = pti->pt_tty; 505 char buf[BUFSIZ]; 506 int error = 0, cc; 507 508 /* 509 * We want to block until the slave 510 * is open, and there's something to read; 511 * but if we lost the slave or we're NBIO, 512 * then return the appropriate error instead. 513 */ 514 for (;;) { 515 if (ISSET(tp->t_state, TS_ISOPEN)) { 516 if (pti->pt_flags&PF_PKT && pti->pt_send) { 517 error = ureadc((int)pti->pt_send, uio); 518 if (error) 519 return (error); 520 if (pti->pt_send & TIOCPKT_IOCTL) { 521 cc = min(uio->uio_resid, 522 sizeof(tp->t_termios)); 523 uiomove((caddr_t) &tp->t_termios, 524 cc, uio); 525 } 526 pti->pt_send = 0; 527 return (0); 528 } 529 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 530 error = ureadc((int)pti->pt_ucntl, uio); 531 if (error) 532 return (error); 533 pti->pt_ucntl = 0; 534 return (0); 535 } 536 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 537 break; 538 } 539 if (!ISSET(tp->t_state, TS_CARR_ON)) 540 return (0); /* EOF */ 541 if (flag & IO_NDELAY) 542 return (EWOULDBLOCK); 543 error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH, 544 ttyin, 0); 545 if (error) 546 return (error); 547 } 548 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 549 error = ureadc(0, uio); 550 while (uio->uio_resid > 0 && error == 0) { 551 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 552 if (cc <= 0) 553 break; 554 error = uiomove(buf, cc, uio); 555 } 556 if (tp->t_outq.c_cc <= tp->t_lowat) { 557 if (ISSET(tp->t_state, TS_ASLEEP)) { 558 CLR(tp->t_state, TS_ASLEEP); 559 wakeup((caddr_t)&tp->t_outq); 560 } 561 selwakeup(&tp->t_wsel); 562 } 563 return (error); 564 } 565 566 567 int 568 ptcwrite(dev, uio, flag) 569 dev_t dev; 570 struct uio *uio; 571 int flag; 572 { 573 struct pt_softc *pti = pt_softc[minor(dev)]; 574 struct tty *tp = pti->pt_tty; 575 u_char *cp = NULL; 576 int cc = 0; 577 u_char locbuf[BUFSIZ]; 578 int cnt = 0; 579 int error = 0; 580 581 again: 582 if (!ISSET(tp->t_state, TS_ISOPEN)) 583 goto block; 584 if (pti->pt_flags & PF_REMOTE) { 585 if (tp->t_canq.c_cc) 586 goto block; 587 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 588 if (cc == 0) { 589 cc = min(uio->uio_resid, BUFSIZ); 590 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 591 cp = locbuf; 592 error = uiomove((caddr_t)cp, cc, uio); 593 if (error) 594 return (error); 595 /* check again for safety */ 596 if (!ISSET(tp->t_state, TS_ISOPEN)) 597 return (EIO); 598 } 599 if (cc) 600 (void) b_to_q((char *)cp, cc, &tp->t_canq); 601 cc = 0; 602 } 603 (void) putc(0, &tp->t_canq); 604 ttwakeup(tp); 605 wakeup((caddr_t)&tp->t_canq); 606 return (0); 607 } 608 while (uio->uio_resid > 0) { 609 if (cc == 0) { 610 cc = min(uio->uio_resid, BUFSIZ); 611 cp = locbuf; 612 error = uiomove((caddr_t)cp, cc, uio); 613 if (error) 614 return (error); 615 /* check again for safety */ 616 if (!ISSET(tp->t_state, TS_ISOPEN)) 617 return (EIO); 618 } 619 while (cc > 0) { 620 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 621 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_iflag, ICANON))) { 622 wakeup((caddr_t)&tp->t_rawq); 623 goto block; 624 } 625 (*tp->t_linesw->l_rint)(*cp++, tp); 626 cnt++; 627 cc--; 628 } 629 cc = 0; 630 } 631 return (0); 632 block: 633 /* 634 * Come here to wait for slave to open, for space 635 * in outq, or space in rawq. 636 */ 637 if (!ISSET(tp->t_state, TS_CARR_ON)) 638 return (EIO); 639 if (flag & IO_NDELAY) { 640 /* adjust for data copied in but not written */ 641 uio->uio_resid += cc; 642 if (cnt == 0) 643 return (EWOULDBLOCK); 644 return (0); 645 } 646 error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 647 ttyout, 0); 648 if (error) { 649 /* adjust for data copied in but not written */ 650 uio->uio_resid += cc; 651 return (error); 652 } 653 goto again; 654 } 655 656 int 657 ptcpoll(dev, events, p) 658 dev_t dev; 659 int events; 660 struct proc *p; 661 { 662 struct pt_softc *pti = pt_softc[minor(dev)]; 663 struct tty *tp = pti->pt_tty; 664 int revents = 0; 665 int s = splsoftclock(); 666 667 if (events & (POLLIN | POLLRDNORM)) 668 if (ISSET(tp->t_state, TS_ISOPEN) && 669 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 670 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 671 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 672 revents |= events & (POLLIN | POLLRDNORM); 673 674 if (events & (POLLOUT | POLLWRNORM)) 675 if (ISSET(tp->t_state, TS_ISOPEN) && 676 ((pti->pt_flags & PF_REMOTE) ? 677 (tp->t_canq.c_cc == 0) : 678 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 679 (tp->t_canq.c_cc == 0 && ISSET(tp->t_iflag, ICANON))))) 680 revents |= events & (POLLOUT | POLLWRNORM); 681 682 if (events & POLLHUP) 683 if (!ISSET(tp->t_state, TS_CARR_ON)) 684 revents |= POLLHUP; 685 686 if (revents == 0) { 687 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 688 selrecord(p, &pti->pt_selr); 689 690 if (events & (POLLOUT | POLLWRNORM)) 691 selrecord(p, &pti->pt_selw); 692 } 693 694 splx(s); 695 return (revents); 696 } 697 698 699 struct tty * 700 ptytty(dev) 701 dev_t dev; 702 { 703 struct pt_softc *pti = pt_softc[minor(dev)]; 704 struct tty *tp = pti->pt_tty; 705 706 return (tp); 707 } 708 709 /*ARGSUSED*/ 710 int 711 ptyioctl(dev, cmd, data, flag, p) 712 dev_t dev; 713 u_long cmd; 714 caddr_t data; 715 int flag; 716 struct proc *p; 717 { 718 struct pt_softc *pti = pt_softc[minor(dev)]; 719 struct tty *tp = pti->pt_tty; 720 u_char *cc = tp->t_cc; 721 int stop, error, sig; 722 723 /* 724 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 725 * ttywflush(tp) will hang if there are characters in the outq. 726 */ 727 if (cmd == TIOCEXT) { 728 /* 729 * When the EXTPROC bit is being toggled, we need 730 * to send an TIOCPKT_IOCTL if the packet driver 731 * is turned on. 732 */ 733 if (*(int *)data) { 734 if (pti->pt_flags & PF_PKT) { 735 pti->pt_send |= TIOCPKT_IOCTL; 736 ptcwakeup(tp, FREAD); 737 } 738 SET(tp->t_lflag, EXTPROC); 739 } else { 740 if (ISSET(tp->t_lflag, EXTPROC) && 741 (pti->pt_flags & PF_PKT)) { 742 pti->pt_send |= TIOCPKT_IOCTL; 743 ptcwakeup(tp, FREAD); 744 } 745 CLR(tp->t_lflag, EXTPROC); 746 } 747 return(0); 748 } else 749 if (cdevsw[major(dev)].d_open == ptcopen) 750 switch (cmd) { 751 752 case TIOCGPGRP: 753 #ifdef COMPAT_SUNOS 754 { 755 /* 756 * I'm not sure about SunOS TIOCGPGRP semantics 757 * on PTYs, but it's something like this: 758 */ 759 extern struct emul emul_sunos; 760 if (p->p_emul == &emul_sunos && tp->t_pgrp == 0) 761 return (EIO); 762 *(int *)data = tp->t_pgrp->pg_id; 763 return (0); 764 } 765 #endif 766 /* 767 * We avoid calling ttioctl on the controller since, 768 * in that case, tp must be the controlling terminal. 769 */ 770 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 771 return (0); 772 773 case TIOCPKT: 774 if (*(int *)data) { 775 if (pti->pt_flags & PF_UCNTL) 776 return (EINVAL); 777 pti->pt_flags |= PF_PKT; 778 } else 779 pti->pt_flags &= ~PF_PKT; 780 return (0); 781 782 case TIOCUCNTL: 783 if (*(int *)data) { 784 if (pti->pt_flags & PF_PKT) 785 return (EINVAL); 786 pti->pt_flags |= PF_UCNTL; 787 } else 788 pti->pt_flags &= ~PF_UCNTL; 789 return (0); 790 791 case TIOCREMOTE: 792 if (*(int *)data) 793 pti->pt_flags |= PF_REMOTE; 794 else 795 pti->pt_flags &= ~PF_REMOTE; 796 ttyflush(tp, FREAD|FWRITE); 797 return (0); 798 799 #ifdef COMPAT_OLDTTY 800 case TIOCSETP: 801 case TIOCSETN: 802 #endif 803 case TIOCSETD: 804 case TIOCSETA: 805 case TIOCSETAW: 806 case TIOCSETAF: 807 ndflush(&tp->t_outq, tp->t_outq.c_cc); 808 break; 809 810 case TIOCSIG: 811 sig = (int)(long)*(caddr_t *)data; 812 if (sig <= 0 || sig >= NSIG) 813 return (EINVAL); 814 if (!ISSET(tp->t_lflag, NOFLSH)) 815 ttyflush(tp, FREAD|FWRITE); 816 pgsignal(tp->t_pgrp, sig, 1); 817 if ((sig == SIGINFO) && 818 (!ISSET(tp->t_lflag, NOKERNINFO))) 819 ttyinfo(tp); 820 return(0); 821 } 822 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 823 if (error < 0) 824 error = ttioctl(tp, cmd, data, flag, p); 825 if (error < 0) { 826 if (pti->pt_flags & PF_UCNTL && 827 (cmd & ~0xff) == UIOCCMD(0)) { 828 if (cmd & 0xff) { 829 pti->pt_ucntl = (u_char)cmd; 830 ptcwakeup(tp, FREAD); 831 } 832 return (0); 833 } 834 error = ENOTTY; 835 } 836 /* 837 * If external processing and packet mode send ioctl packet. 838 */ 839 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 840 switch(cmd) { 841 case TIOCSETA: 842 case TIOCSETAW: 843 case TIOCSETAF: 844 #ifdef COMPAT_OLDTTY 845 case TIOCSETP: 846 case TIOCSETN: 847 case TIOCSETC: 848 case TIOCSLTC: 849 case TIOCLBIS: 850 case TIOCLBIC: 851 case TIOCLSET: 852 #endif 853 pti->pt_send |= TIOCPKT_IOCTL; 854 ptcwakeup(tp, FREAD); 855 default: 856 break; 857 } 858 } 859 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 860 && CCEQ(cc[VSTART], CTRL('q')); 861 if (pti->pt_flags & PF_NOSTOP) { 862 if (stop) { 863 pti->pt_send &= ~TIOCPKT_NOSTOP; 864 pti->pt_send |= TIOCPKT_DOSTOP; 865 pti->pt_flags &= ~PF_NOSTOP; 866 ptcwakeup(tp, FREAD); 867 } 868 } else { 869 if (!stop) { 870 pti->pt_send &= ~TIOCPKT_DOSTOP; 871 pti->pt_send |= TIOCPKT_NOSTOP; 872 pti->pt_flags |= PF_NOSTOP; 873 ptcwakeup(tp, FREAD); 874 } 875 } 876 return (error); 877 } 878
Indexes created Tue Sep 23 23:09:58 GMT 2025