tty_pty.c revision 1.55.2.3
1 /* $NetBSD: tty_pty.c,v 1.55.2.3 2001/11/14 19:16:45 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 <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: tty_pty.c,v 1.55.2.3 2001/11/14 19:16:45 nathanw 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/lwp.h> 52 #include <sys/proc.h> 53 #include <sys/tty.h> 54 #include <sys/file.h> 55 #include <sys/uio.h> 56 #include <sys/kernel.h> 57 #include <sys/vnode.h> 58 #include <sys/signalvar.h> 59 #include <sys/uio.h> 60 #include <sys/conf.h> 61 #include <sys/poll.h> 62 #include <sys/malloc.h> 63 64 #define DEFAULT_NPTYS 16 /* default number of initial ptys */ 65 #define DEFAULT_MAXPTYS 256 /* default maximum number of ptys */ 66 67 /* Macros to clear/set/test flags. */ 68 #define SET(t, f) (t) |= (f) 69 #define CLR(t, f) (t) &= ~((unsigned)(f)) 70 #define ISSET(t, f) ((t) & (f)) 71 72 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 73 74 /* 75 * pts == /dev/tty[pqrs]? 76 * ptc == /dev/pty[pqrs]? 77 */ 78 struct pt_softc { 79 struct tty *pt_tty; 80 int pt_flags; 81 struct selinfo pt_selr, pt_selw; 82 u_char pt_send; 83 u_char pt_ucntl; 84 }; 85 86 static struct pt_softc **pt_softc = NULL; /* pty array */ 87 static int npty = 0; /* for pstat -t */ 88 static int maxptys = DEFAULT_MAXPTYS; /* maximum number of ptys (sysctable) */ 89 static struct simplelock pt_softc_mutex = SIMPLELOCK_INITIALIZER; 90 91 #define PF_PKT 0x08 /* packet mode */ 92 #define PF_STOPPED 0x10 /* user told stopped */ 93 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 94 #define PF_NOSTOP 0x40 95 #define PF_UCNTL 0x80 /* user control mode */ 96 97 void ptyattach __P((int)); 98 void ptcwakeup __P((struct tty *, int)); 99 int ptcopen __P((dev_t, int, int, struct proc *)); 100 struct tty *ptytty __P((dev_t)); 101 void ptsstart __P((struct tty *)); 102 int pty_maxptys __P((int, int)); 103 104 static struct pt_softc **ptyarralloc __P((int)); 105 static int check_pty __P((dev_t)); 106 107 /* 108 * Allocate and zero array of nelem elements. 109 */ 110 static struct pt_softc ** 111 ptyarralloc(nelem) 112 int nelem; 113 { 114 struct pt_softc **pt; 115 nelem += 10; 116 pt = malloc(nelem * sizeof(struct pt_softc *), M_DEVBUF, M_WAITOK); 117 memset(pt, '\0', nelem * sizeof(struct pt_softc *)); 118 return pt; 119 } 120 121 /* 122 * Check if the minor is correct and ensure necessary structures 123 * are properly allocated. 124 */ 125 static int 126 check_pty(dev) 127 dev_t dev; 128 { 129 struct pt_softc *pti; 130 131 if (minor(dev) >= npty) { 132 struct pt_softc **newpt; 133 int newnpty; 134 135 /* check if the requested pty can be granted */ 136 if (minor(dev) >= maxptys) { 137 limit_reached: 138 tablefull("pty", "increase kern.maxptys"); 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 simple_unlock(&pt_softc_mutex); 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->l_proc; 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 selwakeup(&pti->pt_selr); 463 wakeup((caddr_t)&tp->t_outq.c_cf); 464 } 465 if (flag & FWRITE) { 466 selwakeup(&pti->pt_selw); 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 selwakeup(&tp->t_wsel); 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_iflag, 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_iflag, 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 } 715 716 717 struct tty * 718 ptytty(dev) 719 dev_t dev; 720 { 721 struct pt_softc *pti = pt_softc[minor(dev)]; 722 struct tty *tp = pti->pt_tty; 723 724 return (tp); 725 } 726 727 /*ARGSUSED*/ 728 int 729 ptyioctl(dev, cmd, data, flag, p) 730 dev_t dev; 731 u_long cmd; 732 caddr_t data; 733 int flag; 734 struct proc *p; 735 { 736 struct pt_softc *pti = pt_softc[minor(dev)]; 737 struct tty *tp = pti->pt_tty; 738 u_char *cc = tp->t_cc; 739 int stop, error, sig; 740 741 /* 742 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 743 * ttywflush(tp) will hang if there are characters in the outq. 744 */ 745 if (cmd == TIOCEXT) { 746 /* 747 * When the EXTPROC bit is being toggled, we need 748 * to send an TIOCPKT_IOCTL if the packet driver 749 * is turned on. 750 */ 751 if (*(int *)data) { 752 if (pti->pt_flags & PF_PKT) { 753 pti->pt_send |= TIOCPKT_IOCTL; 754 ptcwakeup(tp, FREAD); 755 } 756 SET(tp->t_lflag, EXTPROC); 757 } else { 758 if (ISSET(tp->t_lflag, EXTPROC) && 759 (pti->pt_flags & PF_PKT)) { 760 pti->pt_send |= TIOCPKT_IOCTL; 761 ptcwakeup(tp, FREAD); 762 } 763 CLR(tp->t_lflag, EXTPROC); 764 } 765 return(0); 766 } else 767 if (cdevsw[major(dev)].d_open == ptcopen) 768 switch (cmd) { 769 770 case TIOCGPGRP: 771 #ifdef COMPAT_SUNOS 772 { 773 /* 774 * I'm not sure about SunOS TIOCGPGRP semantics 775 * on PTYs, but it's something like this: 776 */ 777 extern struct emul emul_sunos; 778 if (p->p_emul == &emul_sunos && tp->t_pgrp == 0) 779 return (EIO); 780 *(int *)data = tp->t_pgrp->pg_id; 781 return (0); 782 } 783 #endif 784 /* 785 * We avoid calling ttioctl on the controller since, 786 * in that case, tp must be the controlling terminal. 787 */ 788 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 789 return (0); 790 791 case TIOCPKT: 792 if (*(int *)data) { 793 if (pti->pt_flags & PF_UCNTL) 794 return (EINVAL); 795 pti->pt_flags |= PF_PKT; 796 } else 797 pti->pt_flags &= ~PF_PKT; 798 return (0); 799 800 case TIOCUCNTL: 801 if (*(int *)data) { 802 if (pti->pt_flags & PF_PKT) 803 return (EINVAL); 804 pti->pt_flags |= PF_UCNTL; 805 } else 806 pti->pt_flags &= ~PF_UCNTL; 807 return (0); 808 809 case TIOCREMOTE: 810 if (*(int *)data) 811 pti->pt_flags |= PF_REMOTE; 812 else 813 pti->pt_flags &= ~PF_REMOTE; 814 ttyflush(tp, FREAD|FWRITE); 815 return (0); 816 817 #ifdef COMPAT_OLDTTY 818 case TIOCSETP: 819 case TIOCSETN: 820 #endif 821 case TIOCSETD: 822 case TIOCSETA: 823 case TIOCSETAW: 824 case TIOCSETAF: 825 ndflush(&tp->t_outq, tp->t_outq.c_cc); 826 break; 827 828 case TIOCSIG: 829 sig = (int)(long)*(caddr_t *)data; 830 if (sig <= 0 || sig >= NSIG) 831 return (EINVAL); 832 if (!ISSET(tp->t_lflag, NOFLSH)) 833 ttyflush(tp, FREAD|FWRITE); 834 pgsignal(tp->t_pgrp, sig, 1); 835 if ((sig == SIGINFO) && 836 (!ISSET(tp->t_lflag, NOKERNINFO))) 837 ttyinfo(tp); 838 return(0); 839 } 840 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 841 if (error < 0) 842 error = ttioctl(tp, cmd, data, flag, p); 843 if (error < 0) { 844 if (pti->pt_flags & PF_UCNTL && 845 (cmd & ~0xff) == UIOCCMD(0)) { 846 if (cmd & 0xff) { 847 pti->pt_ucntl = (u_char)cmd; 848 ptcwakeup(tp, FREAD); 849 } 850 return (0); 851 } 852 error = ENOTTY; 853 } 854 /* 855 * If external processing and packet mode send ioctl packet. 856 */ 857 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 858 switch(cmd) { 859 case TIOCSETA: 860 case TIOCSETAW: 861 case TIOCSETAF: 862 #ifdef COMPAT_OLDTTY 863 case TIOCSETP: 864 case TIOCSETN: 865 case TIOCSETC: 866 case TIOCSLTC: 867 case TIOCLBIS: 868 case TIOCLBIC: 869 case TIOCLSET: 870 #endif 871 pti->pt_send |= TIOCPKT_IOCTL; 872 ptcwakeup(tp, FREAD); 873 default: 874 break; 875 } 876 } 877 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 878 && CCEQ(cc[VSTART], CTRL('q')); 879 if (pti->pt_flags & PF_NOSTOP) { 880 if (stop) { 881 pti->pt_send &= ~TIOCPKT_NOSTOP; 882 pti->pt_send |= TIOCPKT_DOSTOP; 883 pti->pt_flags &= ~PF_NOSTOP; 884 ptcwakeup(tp, FREAD); 885 } 886 } else { 887 if (!stop) { 888 pti->pt_send &= ~TIOCPKT_DOSTOP; 889 pti->pt_send |= TIOCPKT_NOSTOP; 890 pti->pt_flags |= PF_NOSTOP; 891 ptcwakeup(tp, FREAD); 892 } 893 } 894 return (error); 895 } 896
Indexes created Tue Sep 30 20:09:53 GMT 2025