tty_pty.c revision 1.57
1 /* $NetBSD: tty_pty.c,v 1.57 2001/11/12 15:25:28 lukem 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 1.57 2001/11/12 15:25:28 lukem 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/proc.h> 52 #include <sys/tty.h> 53 #include <sys/file.h> 54 #include <sys/uio.h> 55 #include <sys/kernel.h> 56 #include <sys/vnode.h> 57 #include <sys/signalvar.h> 58 #include <sys/uio.h> 59 #include <sys/conf.h> 60 #include <sys/poll.h> 61 #include <sys/malloc.h> 62 63 #define DEFAULT_NPTYS 16 /* default number of initial ptys */ 64 #define DEFAULT_MAXPTYS 256 /* default maximum number of ptys */ 65 66 /* Macros to clear/set/test flags. */ 67 #define SET(t, f) (t) |= (f) 68 #define CLR(t, f) (t) &= ~((unsigned)(f)) 69 #define ISSET(t, f) ((t) & (f)) 70 71 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 72 73 /* 74 * pts == /dev/tty[pqrs]? 75 * ptc == /dev/pty[pqrs]? 76 */ 77 struct pt_softc { 78 struct tty *pt_tty; 79 int pt_flags; 80 struct selinfo pt_selr, pt_selw; 81 u_char pt_send; 82 u_char pt_ucntl; 83 }; 84 85 static struct pt_softc **pt_softc = NULL; /* pty array */ 86 static int npty = 0; /* for pstat -t */ 87 static int maxptys = DEFAULT_MAXPTYS; /* maximum number of ptys (sysctable) */ 88 static struct simplelock pt_softc_mutex = SIMPLELOCK_INITIALIZER; 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 return (ENXIO); 139 } 140 141 /* 142 * Now grab the pty array mutex - we need to ensure 143 * that the pty array is consistent while copying it's 144 * content to newly allocated, larger space; we also 145 * need to be safe against pty_maxptys(). 146 */ 147 simple_lock(&pt_softc_mutex); 148 149 do { 150 for(newnpty = npty; newnpty <= minor(dev); 151 newnpty *= 2); 152 153 if (newnpty > maxptys) 154 newnpty = maxptys; 155 156 simple_unlock(&pt_softc_mutex); 157 newpt = ptyarralloc(newnpty); 158 simple_lock(&pt_softc_mutex); 159 160 if (maxptys == npty) { 161 simple_unlock(&pt_softc_mutex); 162 goto limit_reached; 163 } 164 } while(newnpty > maxptys); 165 166 /* 167 * If the pty array was not enlarged while we were waiting 168 * for mutex, copy current contents of pt_softc[] to newly 169 * allocated array and start using the new bigger array. 170 */ 171 if (minor(dev) >= npty) { 172 memcpy(newpt, pt_softc, npty*sizeof(struct pt_softc *)); 173 free(pt_softc, M_DEVBUF); 174 175 pt_softc = newpt; 176 npty = newnpty; 177 } else { 178 /* was enlarged when waited fot lock, free new space */ 179 free(newpt, M_DEVBUF); 180 } 181 182 simple_unlock(&pt_softc_mutex); 183 } 184 185 /* 186 * If the entry is not yet allocated, allocate one. The mutex is 187 * needed so that the state of pt_softc[] array is consistant 188 * in case it has been longened above. 189 */ 190 if (!pt_softc[minor(dev)]) { 191 MALLOC(pti, struct pt_softc *, sizeof(struct pt_softc), 192 M_DEVBUF, M_WAITOK); 193 194 pti->pt_tty = ttymalloc(); 195 196 simple_lock(&pt_softc_mutex); 197 198 /* 199 * Check the entry again - it might have been 200 * added while we were waiting for mutex. 201 */ 202 if (!pt_softc[minor(dev)]) { 203 tty_attach(pti->pt_tty); 204 pt_softc[minor(dev)] = pti; 205 } else { 206 ttyfree(pti->pt_tty); 207 FREE(pti, M_DEVBUF); 208 } 209 210 simple_unlock(&pt_softc_mutex); 211 } 212 213 return (0); 214 } 215 216 /* 217 * Set maxpty in thread-safe way. Returns 0 in case of error, otherwise 218 * new value of maxptys. 219 */ 220 int 221 pty_maxptys(newmax, set) 222 int newmax, set; 223 { 224 if (!set) 225 return (maxptys); 226 227 /* the value cannot be set to value lower than current number of ptys */ 228 if (newmax < npty) 229 return (0); 230 231 /* can proceed immediatelly if bigger than current maximum */ 232 if (newmax > maxptys) { 233 maxptys = newmax; 234 return (maxptys); 235 } 236 237 /* 238 * We have to grab the pt_softc lock, so that we would pick correct 239 * value of npty (might be modified in check_pty()). 240 */ 241 simple_lock(&pt_softc_mutex); 242 243 if (newmax > npty) 244 maxptys = newmax; 245 246 simple_unlock(&pt_softc_mutex); 247 248 return (maxptys); 249 } 250 251 /* 252 * Establish n (or default if n is 1) ptys in the system. 253 */ 254 void 255 ptyattach(n) 256 int n; 257 { 258 /* maybe should allow 0 => none? */ 259 if (n <= 1) 260 n = DEFAULT_NPTYS; 261 pt_softc = ptyarralloc(n); 262 npty = n; 263 } 264 265 /*ARGSUSED*/ 266 int 267 ptsopen(dev, flag, devtype, p) 268 dev_t dev; 269 int flag, devtype; 270 struct proc *p; 271 { 272 struct pt_softc *pti; 273 struct tty *tp; 274 int error; 275 276 if ((error = check_pty(dev))) 277 return (error); 278 279 pti = pt_softc[minor(dev)]; 280 tp = pti->pt_tty; 281 282 if (!ISSET(tp->t_state, TS_ISOPEN)) { 283 ttychars(tp); /* Set up default chars */ 284 tp->t_iflag = TTYDEF_IFLAG; 285 tp->t_oflag = TTYDEF_OFLAG; 286 tp->t_lflag = TTYDEF_LFLAG; 287 tp->t_cflag = TTYDEF_CFLAG; 288 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 289 ttsetwater(tp); /* would be done in xxparam() */ 290 } else if (ISSET(tp->t_state, TS_XCLUDE) && p->p_ucred->cr_uid != 0) 291 return (EBUSY); 292 if (tp->t_oproc) /* Ctrlr still around. */ 293 SET(tp->t_state, TS_CARR_ON); 294 if (!ISSET(flag, O_NONBLOCK)) 295 while (!ISSET(tp->t_state, TS_CARR_ON)) { 296 tp->t_wopen++; 297 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, 298 ttopen, 0); 299 tp->t_wopen--; 300 if (error) 301 return (error); 302 } 303 error = (*tp->t_linesw->l_open)(dev, tp); 304 ptcwakeup(tp, FREAD|FWRITE); 305 return (error); 306 } 307 308 int 309 ptsclose(dev, flag, mode, p) 310 dev_t dev; 311 int flag, mode; 312 struct proc *p; 313 { 314 struct pt_softc *pti = pt_softc[minor(dev)]; 315 struct tty *tp = pti->pt_tty; 316 int error; 317 318 error = (*tp->t_linesw->l_close)(tp, flag); 319 error |= ttyclose(tp); 320 ptcwakeup(tp, FREAD|FWRITE); 321 return (error); 322 } 323 324 int 325 ptsread(dev, uio, flag) 326 dev_t dev; 327 struct uio *uio; 328 int flag; 329 { 330 struct proc *p = curproc; 331 struct pt_softc *pti = pt_softc[minor(dev)]; 332 struct tty *tp = pti->pt_tty; 333 int error = 0; 334 335 again: 336 if (pti->pt_flags & PF_REMOTE) { 337 while (isbackground(p, tp)) { 338 if (sigismasked(p, SIGTTIN) || 339 p->p_pgrp->pg_jobc == 0 || 340 p->p_flag & P_PPWAIT) 341 return (EIO); 342 pgsignal(p->p_pgrp, SIGTTIN, 1); 343 error = ttysleep(tp, (caddr_t)&lbolt, 344 TTIPRI | PCATCH, ttybg, 0); 345 if (error) 346 return (error); 347 } 348 if (tp->t_canq.c_cc == 0) { 349 if (flag & IO_NDELAY) 350 return (EWOULDBLOCK); 351 error = ttysleep(tp, (caddr_t)&tp->t_canq, 352 TTIPRI | PCATCH, ttyin, 0); 353 if (error) 354 return (error); 355 goto again; 356 } 357 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 358 if (ureadc(getc(&tp->t_canq), uio) < 0) { 359 error = EFAULT; 360 break; 361 } 362 if (tp->t_canq.c_cc == 1) 363 (void) getc(&tp->t_canq); 364 if (tp->t_canq.c_cc) 365 return (error); 366 } else 367 if (tp->t_oproc) 368 error = (*tp->t_linesw->l_read)(tp, uio, flag); 369 ptcwakeup(tp, FWRITE); 370 return (error); 371 } 372 373 /* 374 * Write to pseudo-tty. 375 * Wakeups of controlling tty will happen 376 * indirectly, when tty driver calls ptsstart. 377 */ 378 int 379 ptswrite(dev, uio, flag) 380 dev_t dev; 381 struct uio *uio; 382 int flag; 383 { 384 struct pt_softc *pti = pt_softc[minor(dev)]; 385 struct tty *tp = pti->pt_tty; 386 387 if (tp->t_oproc == 0) 388 return (EIO); 389 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 390 } 391 392 /* 393 * Poll pseudo-tty. 394 */ 395 int 396 ptspoll(dev, events, p) 397 dev_t dev; 398 int events; 399 struct proc *p; 400 { 401 struct pt_softc *pti = pt_softc[minor(dev)]; 402 struct tty *tp = pti->pt_tty; 403 404 if (tp->t_oproc == 0) 405 return (EIO); 406 407 return ((*tp->t_linesw->l_poll)(tp, events, p)); 408 } 409 410 /* 411 * Start output on pseudo-tty. 412 * Wake up process polling or sleeping for input from controlling tty. 413 */ 414 void 415 ptsstart(tp) 416 struct tty *tp; 417 { 418 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 419 420 if (ISSET(tp->t_state, TS_TTSTOP)) 421 return; 422 if (pti->pt_flags & PF_STOPPED) { 423 pti->pt_flags &= ~PF_STOPPED; 424 pti->pt_send = TIOCPKT_START; 425 } 426 ptcwakeup(tp, FREAD); 427 } 428 429 void 430 ptsstop(tp, flush) 431 struct tty *tp; 432 int flush; 433 { 434 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 435 int flag; 436 437 /* note: FLUSHREAD and FLUSHWRITE already ok */ 438 if (flush == 0) { 439 flush = TIOCPKT_STOP; 440 pti->pt_flags |= PF_STOPPED; 441 } else 442 pti->pt_flags &= ~PF_STOPPED; 443 pti->pt_send |= flush; 444 /* change of perspective */ 445 flag = 0; 446 if (flush & FREAD) 447 flag |= FWRITE; 448 if (flush & FWRITE) 449 flag |= FREAD; 450 ptcwakeup(tp, flag); 451 } 452 453 void 454 ptcwakeup(tp, flag) 455 struct tty *tp; 456 int flag; 457 { 458 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 459 460 if (flag & FREAD) { 461 selwakeup(&pti->pt_selr); 462 wakeup((caddr_t)&tp->t_outq.c_cf); 463 } 464 if (flag & FWRITE) { 465 selwakeup(&pti->pt_selw); 466 wakeup((caddr_t)&tp->t_rawq.c_cf); 467 } 468 } 469 470 /*ARGSUSED*/ 471 int 472 ptcopen(dev, flag, devtype, p) 473 dev_t dev; 474 int flag, devtype; 475 struct proc *p; 476 { 477 struct pt_softc *pti; 478 struct tty *tp; 479 int error; 480 481 if ((error = check_pty(dev))) 482 return (error); 483 484 pti = pt_softc[minor(dev)]; 485 tp = pti->pt_tty; 486 487 if (tp->t_oproc) 488 return (EIO); 489 tp->t_oproc = ptsstart; 490 (void)(*tp->t_linesw->l_modem)(tp, 1); 491 CLR(tp->t_lflag, EXTPROC); 492 pti->pt_flags = 0; 493 pti->pt_send = 0; 494 pti->pt_ucntl = 0; 495 return (0); 496 } 497 498 /*ARGSUSED*/ 499 int 500 ptcclose(dev, flag, devtype, p) 501 dev_t dev; 502 int flag, devtype; 503 struct proc *p; 504 { 505 struct pt_softc *pti = pt_softc[minor(dev)]; 506 struct tty *tp = pti->pt_tty; 507 508 (void)(*tp->t_linesw->l_modem)(tp, 0); 509 CLR(tp->t_state, TS_CARR_ON); 510 tp->t_oproc = 0; /* mark closed */ 511 return (0); 512 } 513 514 int 515 ptcread(dev, uio, flag) 516 dev_t dev; 517 struct uio *uio; 518 int flag; 519 { 520 struct pt_softc *pti = pt_softc[minor(dev)]; 521 struct tty *tp = pti->pt_tty; 522 char buf[BUFSIZ]; 523 int error = 0, cc; 524 525 /* 526 * We want to block until the slave 527 * is open, and there's something to read; 528 * but if we lost the slave or we're NBIO, 529 * then return the appropriate error instead. 530 */ 531 for (;;) { 532 if (ISSET(tp->t_state, TS_ISOPEN)) { 533 if (pti->pt_flags&PF_PKT && pti->pt_send) { 534 error = ureadc((int)pti->pt_send, uio); 535 if (error) 536 return (error); 537 if (pti->pt_send & TIOCPKT_IOCTL) { 538 cc = min(uio->uio_resid, 539 sizeof(tp->t_termios)); 540 uiomove((caddr_t) &tp->t_termios, 541 cc, uio); 542 } 543 pti->pt_send = 0; 544 return (0); 545 } 546 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 547 error = ureadc((int)pti->pt_ucntl, uio); 548 if (error) 549 return (error); 550 pti->pt_ucntl = 0; 551 return (0); 552 } 553 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 554 break; 555 } 556 if (!ISSET(tp->t_state, TS_CARR_ON)) 557 return (0); /* EOF */ 558 if (flag & IO_NDELAY) 559 return (EWOULDBLOCK); 560 error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH, 561 ttyin, 0); 562 if (error) 563 return (error); 564 } 565 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 566 error = ureadc(0, uio); 567 while (uio->uio_resid > 0 && error == 0) { 568 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 569 if (cc <= 0) 570 break; 571 error = uiomove(buf, cc, uio); 572 } 573 if (tp->t_outq.c_cc <= tp->t_lowat) { 574 if (ISSET(tp->t_state, TS_ASLEEP)) { 575 CLR(tp->t_state, TS_ASLEEP); 576 wakeup((caddr_t)&tp->t_outq); 577 } 578 selwakeup(&tp->t_wsel); 579 } 580 return (error); 581 } 582 583 584 int 585 ptcwrite(dev, uio, flag) 586 dev_t dev; 587 struct uio *uio; 588 int flag; 589 { 590 struct pt_softc *pti = pt_softc[minor(dev)]; 591 struct tty *tp = pti->pt_tty; 592 u_char *cp = NULL; 593 int cc = 0; 594 u_char locbuf[BUFSIZ]; 595 int cnt = 0; 596 int error = 0; 597 598 again: 599 if (!ISSET(tp->t_state, TS_ISOPEN)) 600 goto block; 601 if (pti->pt_flags & PF_REMOTE) { 602 if (tp->t_canq.c_cc) 603 goto block; 604 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 605 if (cc == 0) { 606 cc = min(uio->uio_resid, BUFSIZ); 607 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 608 cp = locbuf; 609 error = uiomove((caddr_t)cp, cc, uio); 610 if (error) 611 return (error); 612 /* check again for safety */ 613 if (!ISSET(tp->t_state, TS_ISOPEN)) 614 return (EIO); 615 } 616 if (cc) 617 (void) b_to_q((char *)cp, cc, &tp->t_canq); 618 cc = 0; 619 } 620 (void) putc(0, &tp->t_canq); 621 ttwakeup(tp); 622 wakeup((caddr_t)&tp->t_canq); 623 return (0); 624 } 625 while (uio->uio_resid > 0) { 626 if (cc == 0) { 627 cc = min(uio->uio_resid, BUFSIZ); 628 cp = locbuf; 629 error = uiomove((caddr_t)cp, cc, uio); 630 if (error) 631 return (error); 632 /* check again for safety */ 633 if (!ISSET(tp->t_state, TS_ISOPEN)) 634 return (EIO); 635 } 636 while (cc > 0) { 637 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 638 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_iflag, ICANON))) { 639 wakeup((caddr_t)&tp->t_rawq); 640 goto block; 641 } 642 (*tp->t_linesw->l_rint)(*cp++, tp); 643 cnt++; 644 cc--; 645 } 646 cc = 0; 647 } 648 return (0); 649 block: 650 /* 651 * Come here to wait for slave to open, for space 652 * in outq, or space in rawq. 653 */ 654 if (!ISSET(tp->t_state, TS_CARR_ON)) 655 return (EIO); 656 if (flag & IO_NDELAY) { 657 /* adjust for data copied in but not written */ 658 uio->uio_resid += cc; 659 if (cnt == 0) 660 return (EWOULDBLOCK); 661 return (0); 662 } 663 error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 664 ttyout, 0); 665 if (error) { 666 /* adjust for data copied in but not written */ 667 uio->uio_resid += cc; 668 return (error); 669 } 670 goto again; 671 } 672 673 int 674 ptcpoll(dev, events, p) 675 dev_t dev; 676 int events; 677 struct proc *p; 678 { 679 struct pt_softc *pti = pt_softc[minor(dev)]; 680 struct tty *tp = pti->pt_tty; 681 int revents = 0; 682 int s = splsoftclock(); 683 684 if (events & (POLLIN | POLLRDNORM)) 685 if (ISSET(tp->t_state, TS_ISOPEN) && 686 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 687 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 688 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 689 revents |= events & (POLLIN | POLLRDNORM); 690 691 if (events & (POLLOUT | POLLWRNORM)) 692 if (ISSET(tp->t_state, TS_ISOPEN) && 693 ((pti->pt_flags & PF_REMOTE) ? 694 (tp->t_canq.c_cc == 0) : 695 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 696 (tp->t_canq.c_cc == 0 && ISSET(tp->t_iflag, ICANON))))) 697 revents |= events & (POLLOUT | POLLWRNORM); 698 699 if (events & POLLHUP) 700 if (!ISSET(tp->t_state, TS_CARR_ON)) 701 revents |= POLLHUP; 702 703 if (revents == 0) { 704 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 705 selrecord(p, &pti->pt_selr); 706 707 if (events & (POLLOUT | POLLWRNORM)) 708 selrecord(p, &pti->pt_selw); 709 } 710 711 splx(s); 712 return (revents); 713 } 714 715 716 struct tty * 717 ptytty(dev) 718 dev_t dev; 719 { 720 struct pt_softc *pti = pt_softc[minor(dev)]; 721 struct tty *tp = pti->pt_tty; 722 723 return (tp); 724 } 725 726 /*ARGSUSED*/ 727 int 728 ptyioctl(dev, cmd, data, flag, p) 729 dev_t dev; 730 u_long cmd; 731 caddr_t data; 732 int flag; 733 struct proc *p; 734 { 735 struct pt_softc *pti = pt_softc[minor(dev)]; 736 struct tty *tp = pti->pt_tty; 737 u_char *cc = tp->t_cc; 738 int stop, error, sig; 739 740 /* 741 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 742 * ttywflush(tp) will hang if there are characters in the outq. 743 */ 744 if (cmd == TIOCEXT) { 745 /* 746 * When the EXTPROC bit is being toggled, we need 747 * to send an TIOCPKT_IOCTL if the packet driver 748 * is turned on. 749 */ 750 if (*(int *)data) { 751 if (pti->pt_flags & PF_PKT) { 752 pti->pt_send |= TIOCPKT_IOCTL; 753 ptcwakeup(tp, FREAD); 754 } 755 SET(tp->t_lflag, EXTPROC); 756 } else { 757 if (ISSET(tp->t_lflag, EXTPROC) && 758 (pti->pt_flags & PF_PKT)) { 759 pti->pt_send |= TIOCPKT_IOCTL; 760 ptcwakeup(tp, FREAD); 761 } 762 CLR(tp->t_lflag, EXTPROC); 763 } 764 return(0); 765 } else 766 if (cdevsw[major(dev)].d_open == ptcopen) 767 switch (cmd) { 768 769 case TIOCGPGRP: 770 #ifdef COMPAT_SUNOS 771 { 772 /* 773 * I'm not sure about SunOS TIOCGPGRP semantics 774 * on PTYs, but it's something like this: 775 */ 776 extern struct emul emul_sunos; 777 if (p->p_emul == &emul_sunos && tp->t_pgrp == 0) 778 return (EIO); 779 *(int *)data = tp->t_pgrp->pg_id; 780 return (0); 781 } 782 #endif 783 /* 784 * We avoid calling ttioctl on the controller since, 785 * in that case, tp must be the controlling terminal. 786 */ 787 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 788 return (0); 789 790 case TIOCPKT: 791 if (*(int *)data) { 792 if (pti->pt_flags & PF_UCNTL) 793 return (EINVAL); 794 pti->pt_flags |= PF_PKT; 795 } else 796 pti->pt_flags &= ~PF_PKT; 797 return (0); 798 799 case TIOCUCNTL: 800 if (*(int *)data) { 801 if (pti->pt_flags & PF_PKT) 802 return (EINVAL); 803 pti->pt_flags |= PF_UCNTL; 804 } else 805 pti->pt_flags &= ~PF_UCNTL; 806 return (0); 807 808 case TIOCREMOTE: 809 if (*(int *)data) 810 pti->pt_flags |= PF_REMOTE; 811 else 812 pti->pt_flags &= ~PF_REMOTE; 813 ttyflush(tp, FREAD|FWRITE); 814 return (0); 815 816 #ifdef COMPAT_OLDTTY 817 case TIOCSETP: 818 case TIOCSETN: 819 #endif 820 case TIOCSETD: 821 case TIOCSETA: 822 case TIOCSETAW: 823 case TIOCSETAF: 824 ndflush(&tp->t_outq, tp->t_outq.c_cc); 825 break; 826 827 case TIOCSIG: 828 sig = (int)(long)*(caddr_t *)data; 829 if (sig <= 0 || sig >= NSIG) 830 return (EINVAL); 831 if (!ISSET(tp->t_lflag, NOFLSH)) 832 ttyflush(tp, FREAD|FWRITE); 833 pgsignal(tp->t_pgrp, sig, 1); 834 if ((sig == SIGINFO) && 835 (!ISSET(tp->t_lflag, NOKERNINFO))) 836 ttyinfo(tp); 837 return(0); 838 } 839 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 840 if (error < 0) 841 error = ttioctl(tp, cmd, data, flag, p); 842 if (error < 0) { 843 if (pti->pt_flags & PF_UCNTL && 844 (cmd & ~0xff) == UIOCCMD(0)) { 845 if (cmd & 0xff) { 846 pti->pt_ucntl = (u_char)cmd; 847 ptcwakeup(tp, FREAD); 848 } 849 return (0); 850 } 851 error = ENOTTY; 852 } 853 /* 854 * If external processing and packet mode send ioctl packet. 855 */ 856 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 857 switch(cmd) { 858 case TIOCSETA: 859 case TIOCSETAW: 860 case TIOCSETAF: 861 #ifdef COMPAT_OLDTTY 862 case TIOCSETP: 863 case TIOCSETN: 864 case TIOCSETC: 865 case TIOCSLTC: 866 case TIOCLBIS: 867 case TIOCLBIC: 868 case TIOCLSET: 869 #endif 870 pti->pt_send |= TIOCPKT_IOCTL; 871 ptcwakeup(tp, FREAD); 872 default: 873 break; 874 } 875 } 876 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 877 && CCEQ(cc[VSTART], CTRL('q')); 878 if (pti->pt_flags & PF_NOSTOP) { 879 if (stop) { 880 pti->pt_send &= ~TIOCPKT_NOSTOP; 881 pti->pt_send |= TIOCPKT_DOSTOP; 882 pti->pt_flags &= ~PF_NOSTOP; 883 ptcwakeup(tp, FREAD); 884 } 885 } else { 886 if (!stop) { 887 pti->pt_send &= ~TIOCPKT_DOSTOP; 888 pti->pt_send |= TIOCPKT_NOSTOP; 889 pti->pt_flags |= PF_NOSTOP; 890 ptcwakeup(tp, FREAD); 891 } 892 } 893 return (error); 894 } 895
Indexes created Tue Sep 23 02:09:52 GMT 2025