tty_pty.c revision 1.55.2.2
1 /* $NetBSD: tty_pty.c,v 1.55.2.2 2001/06/21 20:07:07 nathanw 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/lwp.h> 49 #include <sys/proc.h> 50 #include <sys/tty.h> 51 #include <sys/file.h> 52 #include <sys/uio.h> 53 #include <sys/kernel.h> 54 #include <sys/vnode.h> 55 #include <sys/signalvar.h> 56 #include <sys/uio.h> 57 #include <sys/conf.h> 58 #include <sys/poll.h> 59 #include <sys/malloc.h> 60 61 #define DEFAULT_NPTYS 16 /* default number of initial ptys */ 62 #define DEFAULT_MAXPTYS 256 /* default maximum number of ptys */ 63 64 /* Macros to clear/set/test flags. */ 65 #define SET(t, f) (t) |= (f) 66 #define CLR(t, f) (t) &= ~((unsigned)(f)) 67 #define ISSET(t, f) ((t) & (f)) 68 69 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 70 71 /* 72 * pts == /dev/tty[pqrs]? 73 * ptc == /dev/pty[pqrs]? 74 */ 75 struct pt_softc { 76 struct tty *pt_tty; 77 int pt_flags; 78 struct selinfo pt_selr, pt_selw; 79 u_char pt_send; 80 u_char pt_ucntl; 81 }; 82 83 static struct pt_softc **pt_softc = NULL; /* pty array */ 84 static int npty = 0; /* for pstat -t */ 85 static int maxptys = DEFAULT_MAXPTYS; /* maximum number of ptys (sysctable) */ 86 static struct simplelock pt_softc_mutex = SIMPLELOCK_INITIALIZER; 87 88 #define PF_PKT 0x08 /* packet mode */ 89 #define PF_STOPPED 0x10 /* user told stopped */ 90 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 91 #define PF_NOSTOP 0x40 92 #define PF_UCNTL 0x80 /* user control mode */ 93 94 void ptyattach __P((int)); 95 void ptcwakeup __P((struct tty *, int)); 96 int ptcopen __P((dev_t, int, int, struct proc *)); 97 struct tty *ptytty __P((dev_t)); 98 void ptsstart __P((struct tty *)); 99 int pty_maxptys __P((int, int)); 100 101 static struct pt_softc **ptyarralloc __P((int)); 102 static int check_pty __P((dev_t)); 103 104 /* 105 * Allocate and zero array of nelem elements. 106 */ 107 static struct pt_softc ** 108 ptyarralloc(nelem) 109 int nelem; 110 { 111 struct pt_softc **pt; 112 nelem += 10; 113 pt = malloc(nelem * sizeof(struct pt_softc *), M_DEVBUF, M_WAITOK); 114 memset(pt, '\0', nelem * sizeof(struct pt_softc *)); 115 return pt; 116 } 117 118 /* 119 * Check if the minor is correct and ensure necessary structures 120 * are properly allocated. 121 */ 122 static int 123 check_pty(dev) 124 dev_t dev; 125 { 126 struct pt_softc *pti; 127 128 if (minor(dev) >= npty) { 129 struct pt_softc **newpt; 130 int newnpty; 131 132 /* check if the requested pty can be granted */ 133 if (minor(dev) >= maxptys) { 134 limit_reached: 135 tablefull("pty", "increase kern.maxptys"); 136 return (ENXIO); 137 } 138 139 /* 140 * Now grab the pty array mutex - we need to ensure 141 * that the pty array is consistent while copying it's 142 * content to newly allocated, larger space; we also 143 * need to be safe against pty_maxptys(). 144 */ 145 simple_lock(&pt_softc_mutex); 146 147 do { 148 for(newnpty = npty; newnpty <= minor(dev); 149 newnpty *= 2); 150 151 if (newnpty > maxptys) 152 newnpty = maxptys; 153 154 simple_unlock(&pt_softc_mutex); 155 newpt = ptyarralloc(newnpty); 156 simple_lock(&pt_softc_mutex); 157 158 if (maxptys == npty) { 159 simple_unlock(&pt_softc_mutex); 160 goto limit_reached; 161 } 162 } while(newnpty > maxptys); 163 164 /* 165 * If the pty array was not enlarged while we were waiting 166 * for mutex, copy current contents of pt_softc[] to newly 167 * allocated array and start using the new bigger array. 168 */ 169 if (minor(dev) >= npty) { 170 memcpy(newpt, pt_softc, npty*sizeof(struct pt_softc *)); 171 free(pt_softc, M_DEVBUF); 172 173 pt_softc = newpt; 174 npty = newnpty; 175 } else { 176 /* was enlarged when waited fot lock, free new space */ 177 free(newpt, M_DEVBUF); 178 } 179 180 simple_unlock(&pt_softc_mutex); 181 } 182 183 /* 184 * If the entry is not yet allocated, allocate one. The mutex is 185 * needed so that the state of pt_softc[] array is consistant 186 * in case it has been longened above. 187 */ 188 if (!pt_softc[minor(dev)]) { 189 MALLOC(pti, struct pt_softc *, sizeof(struct pt_softc), 190 M_DEVBUF, M_WAITOK); 191 192 pti->pt_tty = ttymalloc(); 193 194 simple_lock(&pt_softc_mutex); 195 196 /* 197 * Check the entry again - it might have been 198 * added while we were waiting for mutex. 199 */ 200 if (!pt_softc[minor(dev)]) { 201 tty_attach(pti->pt_tty); 202 pt_softc[minor(dev)] = pti; 203 } else { 204 ttyfree(pti->pt_tty); 205 FREE(pti, M_DEVBUF); 206 } 207 208 simple_unlock(&pt_softc_mutex); 209 } 210 211 return (0); 212 } 213 214 /* 215 * Set maxpty in thread-safe way. Returns 0 in case of error, otherwise 216 * new value of maxptys. 217 */ 218 int 219 pty_maxptys(newmax, set) 220 int newmax, set; 221 { 222 if (!set) 223 return (maxptys); 224 225 /* the value cannot be set to value lower than current number of ptys */ 226 if (newmax < npty) 227 return (0); 228 229 /* can proceed immediatelly if bigger than current maximum */ 230 if (newmax > maxptys) { 231 maxptys = newmax; 232 return (maxptys); 233 } 234 235 /* 236 * We have to grab the pt_softc lock, so that we would pick correct 237 * value of npty (might be modified in check_pty()). 238 */ 239 simple_lock(&pt_softc_mutex); 240 241 if (newmax > npty) 242 maxptys = newmax; 243 244 simple_unlock(&pt_softc_mutex); 245 246 return (maxptys); 247 } 248 249 /* 250 * Establish n (or default if n is 1) ptys in the system. 251 */ 252 void 253 ptyattach(n) 254 int n; 255 { 256 /* maybe should allow 0 => none? */ 257 if (n <= 1) 258 n = DEFAULT_NPTYS; 259 pt_softc = ptyarralloc(n); 260 npty = n; 261 } 262 263 /*ARGSUSED*/ 264 int 265 ptsopen(dev, flag, devtype, p) 266 dev_t dev; 267 int flag, devtype; 268 struct proc *p; 269 { 270 struct pt_softc *pti; 271 struct tty *tp; 272 int error; 273 274 if ((error = check_pty(dev))) 275 return (error); 276 277 pti = pt_softc[minor(dev)]; 278 tp = pti->pt_tty; 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)(dev, tp); 302 ptcwakeup(tp, FREAD|FWRITE); 303 return (error); 304 } 305 306 int 307 ptsclose(dev, flag, mode, p) 308 dev_t dev; 309 int flag, mode; 310 struct proc *p; 311 { 312 struct pt_softc *pti = pt_softc[minor(dev)]; 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(dev, uio, flag) 324 dev_t dev; 325 struct uio *uio; 326 int flag; 327 { 328 struct proc *p = curproc->l_proc; 329 struct pt_softc *pti = pt_softc[minor(dev)]; 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(dev, uio, flag) 378 dev_t dev; 379 struct uio *uio; 380 int flag; 381 { 382 struct pt_softc *pti = pt_softc[minor(dev)]; 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(dev, events, p) 395 dev_t dev; 396 int events; 397 struct proc *p; 398 { 399 struct pt_softc *pti = pt_softc[minor(dev)]; 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 = pt_softc[minor(tp->t_dev)]; 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 = pt_softc[minor(tp->t_dev)]; 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 = pt_softc[minor(tp->t_dev)]; 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(dev, flag, devtype, p) 471 dev_t dev; 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(dev))) 480 return (error); 481 482 pti = pt_softc[minor(dev)]; 483 tp = pti->pt_tty; 484 485 if (tp->t_oproc) 486 return (EIO); 487 tp->t_oproc = ptsstart; 488 (void)(*tp->t_linesw->l_modem)(tp, 1); 489 CLR(tp->t_lflag, EXTPROC); 490 pti->pt_flags = 0; 491 pti->pt_send = 0; 492 pti->pt_ucntl = 0; 493 return (0); 494 } 495 496 /*ARGSUSED*/ 497 int 498 ptcclose(dev, flag, devtype, p) 499 dev_t dev; 500 int flag, devtype; 501 struct proc *p; 502 { 503 struct pt_softc *pti = pt_softc[minor(dev)]; 504 struct tty *tp = pti->pt_tty; 505 506 (void)(*tp->t_linesw->l_modem)(tp, 0); 507 CLR(tp->t_state, TS_CARR_ON); 508 tp->t_oproc = 0; /* mark closed */ 509 return (0); 510 } 511 512 int 513 ptcread(dev, uio, flag) 514 dev_t dev; 515 struct uio *uio; 516 int flag; 517 { 518 struct pt_softc *pti = pt_softc[minor(dev)]; 519 struct tty *tp = pti->pt_tty; 520 char buf[BUFSIZ]; 521 int error = 0, cc; 522 523 /* 524 * We want to block until the slave 525 * is open, and there's something to read; 526 * but if we lost the slave or we're NBIO, 527 * then return the appropriate error instead. 528 */ 529 for (;;) { 530 if (ISSET(tp->t_state, TS_ISOPEN)) { 531 if (pti->pt_flags&PF_PKT && pti->pt_send) { 532 error = ureadc((int)pti->pt_send, uio); 533 if (error) 534 return (error); 535 if (pti->pt_send & TIOCPKT_IOCTL) { 536 cc = min(uio->uio_resid, 537 sizeof(tp->t_termios)); 538 uiomove((caddr_t) &tp->t_termios, 539 cc, uio); 540 } 541 pti->pt_send = 0; 542 return (0); 543 } 544 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 545 error = ureadc((int)pti->pt_ucntl, uio); 546 if (error) 547 return (error); 548 pti->pt_ucntl = 0; 549 return (0); 550 } 551 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 552 break; 553 } 554 if (!ISSET(tp->t_state, TS_CARR_ON)) 555 return (0); /* EOF */ 556 if (flag & IO_NDELAY) 557 return (EWOULDBLOCK); 558 error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH, 559 ttyin, 0); 560 if (error) 561 return (error); 562 } 563 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 564 error = ureadc(0, uio); 565 while (uio->uio_resid > 0 && error == 0) { 566 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 567 if (cc <= 0) 568 break; 569 error = uiomove(buf, cc, uio); 570 } 571 if (tp->t_outq.c_cc <= tp->t_lowat) { 572 if (ISSET(tp->t_state, TS_ASLEEP)) { 573 CLR(tp->t_state, TS_ASLEEP); 574 wakeup((caddr_t)&tp->t_outq); 575 } 576 selwakeup(&tp->t_wsel); 577 } 578 return (error); 579 } 580 581 582 int 583 ptcwrite(dev, uio, flag) 584 dev_t dev; 585 struct uio *uio; 586 int flag; 587 { 588 struct pt_softc *pti = pt_softc[minor(dev)]; 589 struct tty *tp = pti->pt_tty; 590 u_char *cp = NULL; 591 int cc = 0; 592 u_char locbuf[BUFSIZ]; 593 int cnt = 0; 594 int error = 0; 595 596 again: 597 if (!ISSET(tp->t_state, TS_ISOPEN)) 598 goto block; 599 if (pti->pt_flags & PF_REMOTE) { 600 if (tp->t_canq.c_cc) 601 goto block; 602 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 603 if (cc == 0) { 604 cc = min(uio->uio_resid, BUFSIZ); 605 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 606 cp = locbuf; 607 error = uiomove((caddr_t)cp, cc, uio); 608 if (error) 609 return (error); 610 /* check again for safety */ 611 if (!ISSET(tp->t_state, TS_ISOPEN)) 612 return (EIO); 613 } 614 if (cc) 615 (void) b_to_q((char *)cp, cc, &tp->t_canq); 616 cc = 0; 617 } 618 (void) putc(0, &tp->t_canq); 619 ttwakeup(tp); 620 wakeup((caddr_t)&tp->t_canq); 621 return (0); 622 } 623 while (uio->uio_resid > 0) { 624 if (cc == 0) { 625 cc = min(uio->uio_resid, BUFSIZ); 626 cp = locbuf; 627 error = uiomove((caddr_t)cp, cc, uio); 628 if (error) 629 return (error); 630 /* check again for safety */ 631 if (!ISSET(tp->t_state, TS_ISOPEN)) 632 return (EIO); 633 } 634 while (cc > 0) { 635 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 636 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_iflag, ICANON))) { 637 wakeup((caddr_t)&tp->t_rawq); 638 goto block; 639 } 640 (*tp->t_linesw->l_rint)(*cp++, tp); 641 cnt++; 642 cc--; 643 } 644 cc = 0; 645 } 646 return (0); 647 block: 648 /* 649 * Come here to wait for slave to open, for space 650 * in outq, or space in rawq. 651 */ 652 if (!ISSET(tp->t_state, TS_CARR_ON)) 653 return (EIO); 654 if (flag & IO_NDELAY) { 655 /* adjust for data copied in but not written */ 656 uio->uio_resid += cc; 657 if (cnt == 0) 658 return (EWOULDBLOCK); 659 return (0); 660 } 661 error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 662 ttyout, 0); 663 if (error) { 664 /* adjust for data copied in but not written */ 665 uio->uio_resid += cc; 666 return (error); 667 } 668 goto again; 669 } 670 671 int 672 ptcpoll(dev, events, p) 673 dev_t dev; 674 int events; 675 struct proc *p; 676 { 677 struct pt_softc *pti = pt_softc[minor(dev)]; 678 struct tty *tp = pti->pt_tty; 679 int revents = 0; 680 int s = splsoftclock(); 681 682 if (events & (POLLIN | POLLRDNORM)) 683 if (ISSET(tp->t_state, TS_ISOPEN) && 684 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 685 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 686 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 687 revents |= events & (POLLIN | POLLRDNORM); 688 689 if (events & (POLLOUT | POLLWRNORM)) 690 if (ISSET(tp->t_state, TS_ISOPEN) && 691 ((pti->pt_flags & PF_REMOTE) ? 692 (tp->t_canq.c_cc == 0) : 693 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 694 (tp->t_canq.c_cc == 0 && ISSET(tp->t_iflag, ICANON))))) 695 revents |= events & (POLLOUT | POLLWRNORM); 696 697 if (events & POLLHUP) 698 if (!ISSET(tp->t_state, TS_CARR_ON)) 699 revents |= POLLHUP; 700 701 if (revents == 0) { 702 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 703 selrecord(p, &pti->pt_selr); 704 705 if (events & (POLLOUT | POLLWRNORM)) 706 selrecord(p, &pti->pt_selw); 707 } 708 709 splx(s); 710 return (revents); 711 } 712 713 714 struct tty * 715 ptytty(dev) 716 dev_t dev; 717 { 718 struct pt_softc *pti = pt_softc[minor(dev)]; 719 struct tty *tp = pti->pt_tty; 720 721 return (tp); 722 } 723 724 /*ARGSUSED*/ 725 int 726 ptyioctl(dev, cmd, data, flag, p) 727 dev_t dev; 728 u_long cmd; 729 caddr_t data; 730 int flag; 731 struct proc *p; 732 { 733 struct pt_softc *pti = pt_softc[minor(dev)]; 734 struct tty *tp = pti->pt_tty; 735 u_char *cc = tp->t_cc; 736 int stop, error, sig; 737 738 /* 739 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 740 * ttywflush(tp) will hang if there are characters in the outq. 741 */ 742 if (cmd == TIOCEXT) { 743 /* 744 * When the EXTPROC bit is being toggled, we need 745 * to send an TIOCPKT_IOCTL if the packet driver 746 * is turned on. 747 */ 748 if (*(int *)data) { 749 if (pti->pt_flags & PF_PKT) { 750 pti->pt_send |= TIOCPKT_IOCTL; 751 ptcwakeup(tp, FREAD); 752 } 753 SET(tp->t_lflag, EXTPROC); 754 } else { 755 if (ISSET(tp->t_lflag, EXTPROC) && 756 (pti->pt_flags & PF_PKT)) { 757 pti->pt_send |= TIOCPKT_IOCTL; 758 ptcwakeup(tp, FREAD); 759 } 760 CLR(tp->t_lflag, EXTPROC); 761 } 762 return(0); 763 } else 764 if (cdevsw[major(dev)].d_open == ptcopen) 765 switch (cmd) { 766 767 case TIOCGPGRP: 768 #ifdef COMPAT_SUNOS 769 { 770 /* 771 * I'm not sure about SunOS TIOCGPGRP semantics 772 * on PTYs, but it's something like this: 773 */ 774 extern struct emul emul_sunos; 775 if (p->p_emul == &emul_sunos && tp->t_pgrp == 0) 776 return (EIO); 777 *(int *)data = tp->t_pgrp->pg_id; 778 return (0); 779 } 780 #endif 781 /* 782 * We avoid calling ttioctl on the controller since, 783 * in that case, tp must be the controlling terminal. 784 */ 785 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 786 return (0); 787 788 case TIOCPKT: 789 if (*(int *)data) { 790 if (pti->pt_flags & PF_UCNTL) 791 return (EINVAL); 792 pti->pt_flags |= PF_PKT; 793 } else 794 pti->pt_flags &= ~PF_PKT; 795 return (0); 796 797 case TIOCUCNTL: 798 if (*(int *)data) { 799 if (pti->pt_flags & PF_PKT) 800 return (EINVAL); 801 pti->pt_flags |= PF_UCNTL; 802 } else 803 pti->pt_flags &= ~PF_UCNTL; 804 return (0); 805 806 case TIOCREMOTE: 807 if (*(int *)data) 808 pti->pt_flags |= PF_REMOTE; 809 else 810 pti->pt_flags &= ~PF_REMOTE; 811 ttyflush(tp, FREAD|FWRITE); 812 return (0); 813 814 #ifdef COMPAT_OLDTTY 815 case TIOCSETP: 816 case TIOCSETN: 817 #endif 818 case TIOCSETD: 819 case TIOCSETA: 820 case TIOCSETAW: 821 case TIOCSETAF: 822 ndflush(&tp->t_outq, tp->t_outq.c_cc); 823 break; 824 825 case TIOCSIG: 826 sig = (int)(long)*(caddr_t *)data; 827 if (sig <= 0 || sig >= NSIG) 828 return (EINVAL); 829 if (!ISSET(tp->t_lflag, NOFLSH)) 830 ttyflush(tp, FREAD|FWRITE); 831 pgsignal(tp->t_pgrp, sig, 1); 832 if ((sig == SIGINFO) && 833 (!ISSET(tp->t_lflag, NOKERNINFO))) 834 ttyinfo(tp); 835 return(0); 836 } 837 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 838 if (error < 0) 839 error = ttioctl(tp, cmd, data, flag, p); 840 if (error < 0) { 841 if (pti->pt_flags & PF_UCNTL && 842 (cmd & ~0xff) == UIOCCMD(0)) { 843 if (cmd & 0xff) { 844 pti->pt_ucntl = (u_char)cmd; 845 ptcwakeup(tp, FREAD); 846 } 847 return (0); 848 } 849 error = ENOTTY; 850 } 851 /* 852 * If external processing and packet mode send ioctl packet. 853 */ 854 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 855 switch(cmd) { 856 case TIOCSETA: 857 case TIOCSETAW: 858 case TIOCSETAF: 859 #ifdef COMPAT_OLDTTY 860 case TIOCSETP: 861 case TIOCSETN: 862 case TIOCSETC: 863 case TIOCSLTC: 864 case TIOCLBIS: 865 case TIOCLBIC: 866 case TIOCLSET: 867 #endif 868 pti->pt_send |= TIOCPKT_IOCTL; 869 ptcwakeup(tp, FREAD); 870 default: 871 break; 872 } 873 } 874 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 875 && CCEQ(cc[VSTART], CTRL('q')); 876 if (pti->pt_flags & PF_NOSTOP) { 877 if (stop) { 878 pti->pt_send &= ~TIOCPKT_NOSTOP; 879 pti->pt_send |= TIOCPKT_DOSTOP; 880 pti->pt_flags &= ~PF_NOSTOP; 881 ptcwakeup(tp, FREAD); 882 } 883 } else { 884 if (!stop) { 885 pti->pt_send &= ~TIOCPKT_DOSTOP; 886 pti->pt_send |= TIOCPKT_NOSTOP; 887 pti->pt_flags |= PF_NOSTOP; 888 ptcwakeup(tp, FREAD); 889 } 890 } 891 return (error); 892 } 893
Indexes created Tue Sep 30 20:09:53 GMT 2025