tty_pty.c revision 1.64
1 /* $NetBSD: tty_pty.c,v 1.64 2002/09/22 18:13:38 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 <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: tty_pty.c,v 1.64 2002/09/22 18:13:38 jdolecek 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 992 /* 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 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 dev_type_open(ptcopen); 105 dev_type_close(ptcclose); 106 dev_type_read(ptcread); 107 dev_type_write(ptcwrite); 108 dev_type_poll(ptcpoll); 109 110 dev_type_open(ptsopen); 111 dev_type_close(ptsclose); 112 dev_type_read(ptsread); 113 dev_type_write(ptswrite); 114 dev_type_stop(ptsstop); 115 dev_type_poll(ptspoll); 116 117 dev_type_ioctl(ptyioctl); 118 dev_type_tty(ptytty); 119 120 const struct cdevsw ptc_cdevsw = { 121 ptcopen, ptcclose, ptcread, ptcwrite, ptyioctl, 122 nullstop, ptytty, ptcpoll, nommap, D_TTY 123 }; 124 125 const struct cdevsw pts_cdevsw = { 126 ptsopen, ptsclose, ptsread, ptswrite, ptyioctl, 127 ptsstop, ptytty, ptspoll, nommap, D_TTY 128 }; 129 130 #if defined(pmax) 131 const struct cdevsw ptc_ultrix_cdevsw = { 132 ptcopen, ptcclose, ptcread, ptcwrite, ptyioctl, 133 nullstop, ptytty, ptcpoll, nommap, D_TTY 134 }; 135 136 const struct cdevsw pts_ultrix_cdevsw = { 137 ptsopen, ptsclose, ptsread, ptswrite, ptyioctl, 138 ptsstop, ptytty, ptspoll, nommap, D_TTY 139 }; 140 #endif /* defined(pmax) */ 141 142 /* 143 * Allocate and zero array of nelem elements. 144 */ 145 static struct pt_softc ** 146 ptyarralloc(nelem) 147 int nelem; 148 { 149 struct pt_softc **pt; 150 nelem += 10; 151 pt = malloc(nelem * sizeof(struct pt_softc *), M_DEVBUF, M_WAITOK); 152 memset(pt, '\0', nelem * sizeof(struct pt_softc *)); 153 return pt; 154 } 155 156 /* 157 * Check if the minor is correct and ensure necessary structures 158 * are properly allocated. 159 */ 160 static int 161 check_pty(dev) 162 dev_t dev; 163 { 164 struct pt_softc *pti; 165 166 if (minor(dev) >= npty) { 167 struct pt_softc **newpt; 168 int newnpty; 169 170 /* check if the requested pty can be granted */ 171 if (minor(dev) >= maxptys) { 172 limit_reached: 173 tablefull("pty", "increase kern.maxptys"); 174 return (ENXIO); 175 } 176 177 /* 178 * Now grab the pty array mutex - we need to ensure 179 * that the pty array is consistent while copying it's 180 * content to newly allocated, larger space; we also 181 * need to be safe against pty_maxptys(). 182 */ 183 simple_lock(&pt_softc_mutex); 184 185 do { 186 for(newnpty = npty; newnpty <= minor(dev); 187 newnpty *= 2); 188 189 if (newnpty > maxptys) 190 newnpty = maxptys; 191 192 simple_unlock(&pt_softc_mutex); 193 newpt = ptyarralloc(newnpty); 194 simple_lock(&pt_softc_mutex); 195 196 if (maxptys == npty) { 197 simple_unlock(&pt_softc_mutex); 198 goto limit_reached; 199 } 200 } while(newnpty > maxptys); 201 202 /* 203 * If the pty array was not enlarged while we were waiting 204 * for mutex, copy current contents of pt_softc[] to newly 205 * allocated array and start using the new bigger array. 206 */ 207 if (minor(dev) >= npty) { 208 memcpy(newpt, pt_softc, npty*sizeof(struct pt_softc *)); 209 free(pt_softc, M_DEVBUF); 210 211 pt_softc = newpt; 212 npty = newnpty; 213 } else { 214 /* was enlarged when waited fot lock, free new space */ 215 free(newpt, M_DEVBUF); 216 } 217 218 simple_unlock(&pt_softc_mutex); 219 } 220 221 /* 222 * If the entry is not yet allocated, allocate one. The mutex is 223 * needed so that the state of pt_softc[] array is consistant 224 * in case it has been longened above. 225 */ 226 if (!pt_softc[minor(dev)]) { 227 MALLOC(pti, struct pt_softc *, sizeof(struct pt_softc), 228 M_DEVBUF, M_WAITOK); 229 memset(pti, 0, sizeof(struct pt_softc)); 230 231 pti->pt_tty = ttymalloc(); 232 233 simple_lock(&pt_softc_mutex); 234 235 /* 236 * Check the entry again - it might have been 237 * added while we were waiting for mutex. 238 */ 239 if (!pt_softc[minor(dev)]) { 240 tty_attach(pti->pt_tty); 241 pt_softc[minor(dev)] = pti; 242 } else { 243 ttyfree(pti->pt_tty); 244 FREE(pti, M_DEVBUF); 245 } 246 247 simple_unlock(&pt_softc_mutex); 248 } 249 250 return (0); 251 } 252 253 /* 254 * Set maxpty in thread-safe way. Returns 0 in case of error, otherwise 255 * new value of maxptys. 256 */ 257 int 258 pty_maxptys(newmax, set) 259 int newmax, set; 260 { 261 if (!set) 262 return (maxptys); 263 264 /* the value cannot be set to value lower than current number of ptys */ 265 if (newmax < npty) 266 return (0); 267 268 /* can proceed immediatelly if bigger than current maximum */ 269 if (newmax > maxptys) { 270 maxptys = newmax; 271 return (maxptys); 272 } 273 274 /* 275 * We have to grab the pt_softc lock, so that we would pick correct 276 * value of npty (might be modified in check_pty()). 277 */ 278 simple_lock(&pt_softc_mutex); 279 280 if (newmax > npty) 281 maxptys = newmax; 282 283 simple_unlock(&pt_softc_mutex); 284 285 return (maxptys); 286 } 287 288 /* 289 * Establish n (or default if n is 1) ptys in the system. 290 */ 291 void 292 ptyattach(n) 293 int n; 294 { 295 /* maybe should allow 0 => none? */ 296 if (n <= 1) 297 n = DEFAULT_NPTYS; 298 pt_softc = ptyarralloc(n); 299 npty = n; 300 } 301 302 /*ARGSUSED*/ 303 int 304 ptsopen(dev, flag, devtype, p) 305 dev_t dev; 306 int flag, devtype; 307 struct proc *p; 308 { 309 struct pt_softc *pti; 310 struct tty *tp; 311 int error; 312 313 if ((error = check_pty(dev))) 314 return (error); 315 316 pti = pt_softc[minor(dev)]; 317 tp = pti->pt_tty; 318 319 if (!ISSET(tp->t_state, TS_ISOPEN)) { 320 ttychars(tp); /* Set up default chars */ 321 tp->t_iflag = TTYDEF_IFLAG; 322 tp->t_oflag = TTYDEF_OFLAG; 323 tp->t_lflag = TTYDEF_LFLAG; 324 tp->t_cflag = TTYDEF_CFLAG; 325 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 326 ttsetwater(tp); /* would be done in xxparam() */ 327 } else if (ISSET(tp->t_state, TS_XCLUDE) && p->p_ucred->cr_uid != 0) 328 return (EBUSY); 329 if (tp->t_oproc) /* Ctrlr still around. */ 330 SET(tp->t_state, TS_CARR_ON); 331 if (!ISSET(flag, O_NONBLOCK)) 332 while (!ISSET(tp->t_state, TS_CARR_ON)) { 333 tp->t_wopen++; 334 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, 335 ttopen, 0); 336 tp->t_wopen--; 337 if (error) 338 return (error); 339 } 340 error = (*tp->t_linesw->l_open)(dev, tp); 341 ptcwakeup(tp, FREAD|FWRITE); 342 return (error); 343 } 344 345 int 346 ptsclose(dev, flag, mode, p) 347 dev_t dev; 348 int flag, mode; 349 struct proc *p; 350 { 351 struct pt_softc *pti = pt_softc[minor(dev)]; 352 struct tty *tp = pti->pt_tty; 353 int error; 354 355 error = (*tp->t_linesw->l_close)(tp, flag); 356 error |= ttyclose(tp); 357 ptcwakeup(tp, FREAD|FWRITE); 358 return (error); 359 } 360 361 int 362 ptsread(dev, uio, flag) 363 dev_t dev; 364 struct uio *uio; 365 int flag; 366 { 367 struct proc *p = curproc; 368 struct pt_softc *pti = pt_softc[minor(dev)]; 369 struct tty *tp = pti->pt_tty; 370 int error = 0; 371 372 again: 373 if (pti->pt_flags & PF_REMOTE) { 374 while (isbackground(p, tp)) { 375 if (sigismasked(p, SIGTTIN) || 376 p->p_pgrp->pg_jobc == 0 || 377 p->p_flag & P_PPWAIT) 378 return (EIO); 379 pgsignal(p->p_pgrp, SIGTTIN, 1); 380 error = ttysleep(tp, (caddr_t)&lbolt, 381 TTIPRI | PCATCH, ttybg, 0); 382 if (error) 383 return (error); 384 } 385 if (tp->t_canq.c_cc == 0) { 386 if (flag & IO_NDELAY) 387 return (EWOULDBLOCK); 388 error = ttysleep(tp, (caddr_t)&tp->t_canq, 389 TTIPRI | PCATCH, ttyin, 0); 390 if (error) 391 return (error); 392 goto again; 393 } 394 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 395 if (ureadc(getc(&tp->t_canq), uio) < 0) { 396 error = EFAULT; 397 break; 398 } 399 if (tp->t_canq.c_cc == 1) 400 (void) getc(&tp->t_canq); 401 if (tp->t_canq.c_cc) 402 return (error); 403 } else 404 if (tp->t_oproc) 405 error = (*tp->t_linesw->l_read)(tp, uio, flag); 406 ptcwakeup(tp, FWRITE); 407 return (error); 408 } 409 410 /* 411 * Write to pseudo-tty. 412 * Wakeups of controlling tty will happen 413 * indirectly, when tty driver calls ptsstart. 414 */ 415 int 416 ptswrite(dev, uio, flag) 417 dev_t dev; 418 struct uio *uio; 419 int flag; 420 { 421 struct pt_softc *pti = pt_softc[minor(dev)]; 422 struct tty *tp = pti->pt_tty; 423 424 if (tp->t_oproc == 0) 425 return (EIO); 426 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 427 } 428 429 /* 430 * Poll pseudo-tty. 431 */ 432 int 433 ptspoll(dev, events, p) 434 dev_t dev; 435 int events; 436 struct proc *p; 437 { 438 struct pt_softc *pti = pt_softc[minor(dev)]; 439 struct tty *tp = pti->pt_tty; 440 441 if (tp->t_oproc == 0) 442 return (EIO); 443 444 return ((*tp->t_linesw->l_poll)(tp, events, p)); 445 } 446 447 /* 448 * Start output on pseudo-tty. 449 * Wake up process polling or sleeping for input from controlling tty. 450 */ 451 void 452 ptsstart(tp) 453 struct tty *tp; 454 { 455 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 456 457 if (ISSET(tp->t_state, TS_TTSTOP)) 458 return; 459 if (pti->pt_flags & PF_STOPPED) { 460 pti->pt_flags &= ~PF_STOPPED; 461 pti->pt_send = TIOCPKT_START; 462 } 463 ptcwakeup(tp, FREAD); 464 } 465 466 void 467 ptsstop(tp, flush) 468 struct tty *tp; 469 int flush; 470 { 471 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 472 int flag; 473 474 /* note: FLUSHREAD and FLUSHWRITE already ok */ 475 if (flush == 0) { 476 flush = TIOCPKT_STOP; 477 pti->pt_flags |= PF_STOPPED; 478 } else 479 pti->pt_flags &= ~PF_STOPPED; 480 pti->pt_send |= flush; 481 /* change of perspective */ 482 flag = 0; 483 if (flush & FREAD) 484 flag |= FWRITE; 485 if (flush & FWRITE) 486 flag |= FREAD; 487 ptcwakeup(tp, flag); 488 } 489 490 void 491 ptcwakeup(tp, flag) 492 struct tty *tp; 493 int flag; 494 { 495 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 496 497 if (flag & FREAD) { 498 selwakeup(&pti->pt_selr); 499 wakeup((caddr_t)&tp->t_outq.c_cf); 500 } 501 if (flag & FWRITE) { 502 selwakeup(&pti->pt_selw); 503 wakeup((caddr_t)&tp->t_rawq.c_cf); 504 } 505 } 506 507 /*ARGSUSED*/ 508 int 509 ptcopen(dev, flag, devtype, p) 510 dev_t dev; 511 int flag, devtype; 512 struct proc *p; 513 { 514 struct pt_softc *pti; 515 struct tty *tp; 516 int error; 517 518 if ((error = check_pty(dev))) 519 return (error); 520 521 pti = pt_softc[minor(dev)]; 522 tp = pti->pt_tty; 523 524 if (tp->t_oproc) 525 return (EIO); 526 tp->t_oproc = ptsstart; 527 (void)(*tp->t_linesw->l_modem)(tp, 1); 528 CLR(tp->t_lflag, EXTPROC); 529 pti->pt_flags = 0; 530 pti->pt_send = 0; 531 pti->pt_ucntl = 0; 532 return (0); 533 } 534 535 /*ARGSUSED*/ 536 int 537 ptcclose(dev, flag, devtype, p) 538 dev_t dev; 539 int flag, devtype; 540 struct proc *p; 541 { 542 struct pt_softc *pti = pt_softc[minor(dev)]; 543 struct tty *tp = pti->pt_tty; 544 545 (void)(*tp->t_linesw->l_modem)(tp, 0); 546 CLR(tp->t_state, TS_CARR_ON); 547 tp->t_oproc = 0; /* mark closed */ 548 return (0); 549 } 550 551 int 552 ptcread(dev, uio, flag) 553 dev_t dev; 554 struct uio *uio; 555 int flag; 556 { 557 struct pt_softc *pti = pt_softc[minor(dev)]; 558 struct tty *tp = pti->pt_tty; 559 char buf[BUFSIZ]; 560 int error = 0, cc; 561 562 /* 563 * We want to block until the slave 564 * is open, and there's something to read; 565 * but if we lost the slave or we're NBIO, 566 * then return the appropriate error instead. 567 */ 568 for (;;) { 569 if (ISSET(tp->t_state, TS_ISOPEN)) { 570 if (pti->pt_flags&PF_PKT && pti->pt_send) { 571 error = ureadc((int)pti->pt_send, uio); 572 if (error) 573 return (error); 574 if (pti->pt_send & TIOCPKT_IOCTL) { 575 cc = min(uio->uio_resid, 576 sizeof(tp->t_termios)); 577 uiomove((caddr_t) &tp->t_termios, 578 cc, uio); 579 } 580 pti->pt_send = 0; 581 return (0); 582 } 583 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 584 error = ureadc((int)pti->pt_ucntl, uio); 585 if (error) 586 return (error); 587 pti->pt_ucntl = 0; 588 return (0); 589 } 590 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 591 break; 592 } 593 if (!ISSET(tp->t_state, TS_CARR_ON)) 594 return (0); /* EOF */ 595 if (flag & IO_NDELAY) 596 return (EWOULDBLOCK); 597 error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH, 598 ttyin, 0); 599 if (error) 600 return (error); 601 } 602 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 603 error = ureadc(0, uio); 604 while (uio->uio_resid > 0 && error == 0) { 605 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 606 if (cc <= 0) 607 break; 608 error = uiomove(buf, cc, uio); 609 } 610 if (tp->t_outq.c_cc <= tp->t_lowat) { 611 if (ISSET(tp->t_state, TS_ASLEEP)) { 612 CLR(tp->t_state, TS_ASLEEP); 613 wakeup((caddr_t)&tp->t_outq); 614 } 615 selwakeup(&tp->t_wsel); 616 } 617 return (error); 618 } 619 620 621 int 622 ptcwrite(dev, uio, flag) 623 dev_t dev; 624 struct uio *uio; 625 int flag; 626 { 627 struct pt_softc *pti = pt_softc[minor(dev)]; 628 struct tty *tp = pti->pt_tty; 629 u_char *cp = NULL; 630 int cc = 0; 631 u_char locbuf[BUFSIZ]; 632 int cnt = 0; 633 int error = 0; 634 635 again: 636 if (!ISSET(tp->t_state, TS_ISOPEN)) 637 goto block; 638 if (pti->pt_flags & PF_REMOTE) { 639 if (tp->t_canq.c_cc) 640 goto block; 641 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 642 if (cc == 0) { 643 cc = min(uio->uio_resid, BUFSIZ); 644 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 645 cp = locbuf; 646 error = uiomove((caddr_t)cp, cc, uio); 647 if (error) 648 return (error); 649 /* check again for safety */ 650 if (!ISSET(tp->t_state, TS_ISOPEN)) 651 return (EIO); 652 } 653 if (cc) 654 (void) b_to_q((char *)cp, cc, &tp->t_canq); 655 cc = 0; 656 } 657 (void) putc(0, &tp->t_canq); 658 ttwakeup(tp); 659 wakeup((caddr_t)&tp->t_canq); 660 return (0); 661 } 662 while (uio->uio_resid > 0) { 663 if (cc == 0) { 664 cc = min(uio->uio_resid, BUFSIZ); 665 cp = locbuf; 666 error = uiomove((caddr_t)cp, cc, uio); 667 if (error) 668 return (error); 669 /* check again for safety */ 670 if (!ISSET(tp->t_state, TS_ISOPEN)) 671 return (EIO); 672 } 673 while (cc > 0) { 674 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 675 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_lflag, ICANON))) { 676 wakeup((caddr_t)&tp->t_rawq); 677 goto block; 678 } 679 (*tp->t_linesw->l_rint)(*cp++, tp); 680 cnt++; 681 cc--; 682 } 683 cc = 0; 684 } 685 return (0); 686 block: 687 /* 688 * Come here to wait for slave to open, for space 689 * in outq, or space in rawq. 690 */ 691 if (!ISSET(tp->t_state, TS_CARR_ON)) 692 return (EIO); 693 if (flag & IO_NDELAY) { 694 /* adjust for data copied in but not written */ 695 uio->uio_resid += cc; 696 if (cnt == 0) 697 return (EWOULDBLOCK); 698 return (0); 699 } 700 error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 701 ttyout, 0); 702 if (error) { 703 /* adjust for data copied in but not written */ 704 uio->uio_resid += cc; 705 return (error); 706 } 707 goto again; 708 } 709 710 int 711 ptcpoll(dev, events, p) 712 dev_t dev; 713 int events; 714 struct proc *p; 715 { 716 struct pt_softc *pti = pt_softc[minor(dev)]; 717 struct tty *tp = pti->pt_tty; 718 int revents = 0; 719 int s = splsoftclock(); 720 721 if (events & (POLLIN | POLLRDNORM)) 722 if (ISSET(tp->t_state, TS_ISOPEN) && 723 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 724 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 725 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 726 revents |= events & (POLLIN | POLLRDNORM); 727 728 if (events & (POLLOUT | POLLWRNORM)) 729 if (ISSET(tp->t_state, TS_ISOPEN) && 730 ((pti->pt_flags & PF_REMOTE) ? 731 (tp->t_canq.c_cc == 0) : 732 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 733 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))) 734 revents |= events & (POLLOUT | POLLWRNORM); 735 736 if (events & POLLHUP) 737 if (!ISSET(tp->t_state, TS_CARR_ON)) 738 revents |= POLLHUP; 739 740 if (revents == 0) { 741 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 742 selrecord(p, &pti->pt_selr); 743 744 if (events & (POLLOUT | POLLWRNORM)) 745 selrecord(p, &pti->pt_selw); 746 } 747 748 splx(s); 749 return (revents); 750 } 751 752 753 struct tty * 754 ptytty(dev) 755 dev_t dev; 756 { 757 struct pt_softc *pti = pt_softc[minor(dev)]; 758 struct tty *tp = pti->pt_tty; 759 760 return (tp); 761 } 762 763 /*ARGSUSED*/ 764 int 765 ptyioctl(dev, cmd, data, flag, p) 766 dev_t dev; 767 u_long cmd; 768 caddr_t data; 769 int flag; 770 struct proc *p; 771 { 772 struct pt_softc *pti = pt_softc[minor(dev)]; 773 struct tty *tp = pti->pt_tty; 774 const struct cdevsw *cdev; 775 u_char *cc = tp->t_cc; 776 int stop, error, sig; 777 778 cdev = cdevsw_lookup(dev); 779 /* 780 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 781 * ttywflush(tp) will hang if there are characters in the outq. 782 */ 783 if (cmd == TIOCEXT) { 784 /* 785 * When the EXTPROC bit is being toggled, we need 786 * to send an TIOCPKT_IOCTL if the packet driver 787 * is turned on. 788 */ 789 if (*(int *)data) { 790 if (pti->pt_flags & PF_PKT) { 791 pti->pt_send |= TIOCPKT_IOCTL; 792 ptcwakeup(tp, FREAD); 793 } 794 SET(tp->t_lflag, EXTPROC); 795 } else { 796 if (ISSET(tp->t_lflag, EXTPROC) && 797 (pti->pt_flags & PF_PKT)) { 798 pti->pt_send |= TIOCPKT_IOCTL; 799 ptcwakeup(tp, FREAD); 800 } 801 CLR(tp->t_lflag, EXTPROC); 802 } 803 return(0); 804 } else 805 if (cdev != NULL && cdev->d_open == ptcopen) 806 switch (cmd) { 807 808 case TIOCGPGRP: 809 /* 810 * We avoid calling ttioctl on the controller since, 811 * in that case, tp must be the controlling terminal. 812 */ 813 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 814 return (0); 815 816 case TIOCPKT: 817 if (*(int *)data) { 818 if (pti->pt_flags & PF_UCNTL) 819 return (EINVAL); 820 pti->pt_flags |= PF_PKT; 821 } else 822 pti->pt_flags &= ~PF_PKT; 823 return (0); 824 825 case TIOCUCNTL: 826 if (*(int *)data) { 827 if (pti->pt_flags & PF_PKT) 828 return (EINVAL); 829 pti->pt_flags |= PF_UCNTL; 830 } else 831 pti->pt_flags &= ~PF_UCNTL; 832 return (0); 833 834 case TIOCREMOTE: 835 if (*(int *)data) 836 pti->pt_flags |= PF_REMOTE; 837 else 838 pti->pt_flags &= ~PF_REMOTE; 839 ttyflush(tp, FREAD|FWRITE); 840 return (0); 841 842 #ifdef COMPAT_OLDTTY 843 case TIOCSETP: 844 case TIOCSETN: 845 #endif 846 case TIOCSETD: 847 case TIOCSETA: 848 case TIOCSETAW: 849 case TIOCSETAF: 850 ndflush(&tp->t_outq, tp->t_outq.c_cc); 851 break; 852 853 case TIOCSIG: 854 sig = (int)(long)*(caddr_t *)data; 855 if (sig <= 0 || sig >= NSIG) 856 return (EINVAL); 857 if (!ISSET(tp->t_lflag, NOFLSH)) 858 ttyflush(tp, FREAD|FWRITE); 859 if ((sig == SIGINFO) && 860 (!ISSET(tp->t_lflag, NOKERNINFO))) 861 ttyinfo(tp); 862 pgsignal(tp->t_pgrp, sig, 1); 863 return(0); 864 } 865 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 866 if (error == EPASSTHROUGH) 867 error = ttioctl(tp, cmd, data, flag, p); 868 if (error == EPASSTHROUGH) { 869 if (pti->pt_flags & PF_UCNTL && 870 (cmd & ~0xff) == UIOCCMD(0)) { 871 if (cmd & 0xff) { 872 pti->pt_ucntl = (u_char)cmd; 873 ptcwakeup(tp, FREAD); 874 } 875 return (0); 876 } 877 } 878 /* 879 * If external processing and packet mode send ioctl packet. 880 */ 881 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 882 switch(cmd) { 883 case TIOCSETA: 884 case TIOCSETAW: 885 case TIOCSETAF: 886 #ifdef COMPAT_OLDTTY 887 case TIOCSETP: 888 case TIOCSETN: 889 case TIOCSETC: 890 case TIOCSLTC: 891 case TIOCLBIS: 892 case TIOCLBIC: 893 case TIOCLSET: 894 #endif 895 pti->pt_send |= TIOCPKT_IOCTL; 896 ptcwakeup(tp, FREAD); 897 default: 898 break; 899 } 900 } 901 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 902 && CCEQ(cc[VSTART], CTRL('q')); 903 if (pti->pt_flags & PF_NOSTOP) { 904 if (stop) { 905 pti->pt_send &= ~TIOCPKT_NOSTOP; 906 pti->pt_send |= TIOCPKT_DOSTOP; 907 pti->pt_flags &= ~PF_NOSTOP; 908 ptcwakeup(tp, FREAD); 909 } 910 } else { 911 if (!stop) { 912 pti->pt_send &= ~TIOCPKT_DOSTOP; 913 pti->pt_send |= TIOCPKT_NOSTOP; 914 pti->pt_flags |= PF_NOSTOP; 915 ptcwakeup(tp, FREAD); 916 } 917 } 918 return (error); 919 } 920
Indexes created Thu Sep 25 16:09:42 GMT 2025