1 /* $NetBSD: tty_pty.c,v 1.66 2002/11/26 18:44:35 christos 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 1.66 2002/11/26 18:44:35 christos 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 dev_type_kqfilter(ptckqfilter); 110 111 dev_type_open(ptsopen); 112 dev_type_close(ptsclose); 113 dev_type_read(ptsread); 114 dev_type_write(ptswrite); 115 dev_type_stop(ptsstop); 116 dev_type_poll(ptspoll); 117 118 dev_type_ioctl(ptyioctl); 119 dev_type_tty(ptytty); 120 121 const struct cdevsw ptc_cdevsw = { 122 ptcopen, ptcclose, ptcread, ptcwrite, ptyioctl, 123 nullstop, ptytty, ptcpoll, nommap, ptckqfilter, D_TTY 124 }; 125 126 const struct cdevsw pts_cdevsw = { 127 ptsopen, ptsclose, ptsread, ptswrite, ptyioctl, 128 ptsstop, ptytty, ptspoll, nommap, ttykqfilter, D_TTY 129 }; 130 131 #if defined(pmax) 132 const struct cdevsw ptc_ultrix_cdevsw = { 133 ptcopen, ptcclose, ptcread, ptcwrite, ptyioctl, 134 nullstop, ptytty, ptcpoll, nommap, ptckqfilter, D_TTY 135 }; 136 137 const struct cdevsw pts_ultrix_cdevsw = { 138 ptsopen, ptsclose, ptsread, ptswrite, ptyioctl, 139 ptsstop, ptytty, ptspoll, nommap, ttykqfilter, D_TTY 140 }; 141 #endif /* defined(pmax) */ 142 143 /* 144 * Allocate and zero array of nelem elements. 145 */ 146 static struct pt_softc ** 147 ptyarralloc(nelem) 148 int nelem; 149 { 150 struct pt_softc **pt; 151 nelem += 10; 152 pt = malloc(nelem * sizeof(struct pt_softc *), M_DEVBUF, M_WAITOK); 153 memset(pt, '\0', nelem * sizeof(struct pt_softc *)); 154 return pt; 155 } 156 157 /* 158 * Check if the minor is correct and ensure necessary structures 159 * are properly allocated. 160 */ 161 static int 162 check_pty(dev) 163 dev_t dev; 164 { 165 struct pt_softc *pti; 166 167 if (minor(dev) >= npty) { 168 struct pt_softc **newpt; 169 int newnpty; 170 171 /* check if the requested pty can be granted */ 172 if (minor(dev) >= maxptys) { 173 limit_reached: 174 tablefull("pty", "increase kern.maxptys"); 175 return (ENXIO); 176 } 177 178 /* 179 * Now grab the pty array mutex - we need to ensure 180 * that the pty array is consistent while copying it's 181 * content to newly allocated, larger space; we also 182 * need to be safe against pty_maxptys(). 183 */ 184 simple_lock(&pt_softc_mutex); 185 186 do { 187 for(newnpty = npty; newnpty <= minor(dev); 188 newnpty *= 2); 189 190 if (newnpty > maxptys) 191 newnpty = maxptys; 192 193 simple_unlock(&pt_softc_mutex); 194 newpt = ptyarralloc(newnpty); 195 simple_lock(&pt_softc_mutex); 196 197 if (maxptys == npty) { 198 simple_unlock(&pt_softc_mutex); 199 goto limit_reached; 200 } 201 } while(newnpty > maxptys); 202 203 /* 204 * If the pty array was not enlarged while we were waiting 205 * for mutex, copy current contents of pt_softc[] to newly 206 * allocated array and start using the new bigger array. 207 */ 208 if (minor(dev) >= npty) { 209 memcpy(newpt, pt_softc, npty*sizeof(struct pt_softc *)); 210 free(pt_softc, M_DEVBUF); 211 212 pt_softc = newpt; 213 npty = newnpty; 214 } else { 215 /* was enlarged when waited fot lock, free new space */ 216 free(newpt, M_DEVBUF); 217 } 218 219 simple_unlock(&pt_softc_mutex); 220 } 221 222 /* 223 * If the entry is not yet allocated, allocate one. The mutex is 224 * needed so that the state of pt_softc[] array is consistant 225 * in case it has been longened above. 226 */ 227 if (!pt_softc[minor(dev)]) { 228 MALLOC(pti, struct pt_softc *, sizeof(struct pt_softc), 229 M_DEVBUF, M_WAITOK); 230 memset(pti, 0, sizeof(struct pt_softc)); 231 232 pti->pt_tty = ttymalloc(); 233 234 simple_lock(&pt_softc_mutex); 235 236 /* 237 * Check the entry again - it might have been 238 * added while we were waiting for mutex. 239 */ 240 if (!pt_softc[minor(dev)]) { 241 tty_attach(pti->pt_tty); 242 pt_softc[minor(dev)] = pti; 243 } else { 244 ttyfree(pti->pt_tty); 245 FREE(pti, M_DEVBUF); 246 } 247 248 simple_unlock(&pt_softc_mutex); 249 } 250 251 return (0); 252 } 253 254 /* 255 * Set maxpty in thread-safe way. Returns 0 in case of error, otherwise 256 * new value of maxptys. 257 */ 258 int 259 pty_maxptys(newmax, set) 260 int newmax, set; 261 { 262 if (!set) 263 return (maxptys); 264 265 /* the value cannot be set to value lower than current number of ptys */ 266 if (newmax < npty) 267 return (0); 268 269 /* can proceed immediatelly if bigger than current maximum */ 270 if (newmax > maxptys) { 271 maxptys = newmax; 272 return (maxptys); 273 } 274 275 /* 276 * We have to grab the pt_softc lock, so that we would pick correct 277 * value of npty (might be modified in check_pty()). 278 */ 279 simple_lock(&pt_softc_mutex); 280 281 if (newmax > npty) 282 maxptys = newmax; 283 284 simple_unlock(&pt_softc_mutex); 285 286 return (maxptys); 287 } 288 289 /* 290 * Establish n (or default if n is 1) ptys in the system. 291 */ 292 void 293 ptyattach(n) 294 int n; 295 { 296 /* maybe should allow 0 => none? */ 297 if (n <= 1) 298 n = DEFAULT_NPTYS; 299 pt_softc = ptyarralloc(n); 300 npty = n; 301 } 302 303 /*ARGSUSED*/ 304 int 305 ptsopen(dev, flag, devtype, p) 306 dev_t dev; 307 int flag, devtype; 308 struct proc *p; 309 { 310 struct pt_softc *pti; 311 struct tty *tp; 312 int error; 313 314 if ((error = check_pty(dev))) 315 return (error); 316 317 pti = pt_softc[minor(dev)]; 318 tp = pti->pt_tty; 319 320 if (!ISSET(tp->t_state, TS_ISOPEN)) { 321 ttychars(tp); /* Set up default chars */ 322 tp->t_iflag = TTYDEF_IFLAG; 323 tp->t_oflag = TTYDEF_OFLAG; 324 tp->t_lflag = TTYDEF_LFLAG; 325 tp->t_cflag = TTYDEF_CFLAG; 326 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 327 ttsetwater(tp); /* would be done in xxparam() */ 328 } else if (ISSET(tp->t_state, TS_XCLUDE) && p->p_ucred->cr_uid != 0) 329 return (EBUSY); 330 if (tp->t_oproc) /* Ctrlr still around. */ 331 SET(tp->t_state, TS_CARR_ON); 332 if (!ISSET(flag, O_NONBLOCK)) 333 while (!ISSET(tp->t_state, TS_CARR_ON)) { 334 tp->t_wopen++; 335 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, 336 ttopen, 0); 337 tp->t_wopen--; 338 if (error) 339 return (error); 340 } 341 error = (*tp->t_linesw->l_open)(dev, tp); 342 ptcwakeup(tp, FREAD|FWRITE); 343 return (error); 344 } 345 346 int 347 ptsclose(dev, flag, mode, p) 348 dev_t dev; 349 int flag, mode; 350 struct proc *p; 351 { 352 struct pt_softc *pti = pt_softc[minor(dev)]; 353 struct tty *tp = pti->pt_tty; 354 int error; 355 356 error = (*tp->t_linesw->l_close)(tp, flag); 357 error |= ttyclose(tp); 358 ptcwakeup(tp, FREAD|FWRITE); 359 return (error); 360 } 361 362 int 363 ptsread(dev, uio, flag) 364 dev_t dev; 365 struct uio *uio; 366 int flag; 367 { 368 struct proc *p = curproc; 369 struct pt_softc *pti = pt_softc[minor(dev)]; 370 struct tty *tp = pti->pt_tty; 371 int error = 0; 372 373 again: 374 if (pti->pt_flags & PF_REMOTE) { 375 while (isbackground(p, tp)) { 376 if (sigismasked(p, SIGTTIN) || 377 p->p_pgrp->pg_jobc == 0 || 378 p->p_flag & P_PPWAIT) 379 return (EIO); 380 pgsignal(p->p_pgrp, SIGTTIN, 1); 381 error = ttysleep(tp, (caddr_t)&lbolt, 382 TTIPRI | PCATCH, ttybg, 0); 383 if (error) 384 return (error); 385 } 386 if (tp->t_canq.c_cc == 0) { 387 if (flag & IO_NDELAY) 388 return (EWOULDBLOCK); 389 error = ttysleep(tp, (caddr_t)&tp->t_canq, 390 TTIPRI | PCATCH, ttyin, 0); 391 if (error) 392 return (error); 393 goto again; 394 } 395 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 396 if (ureadc(getc(&tp->t_canq), uio) < 0) { 397 error = EFAULT; 398 break; 399 } 400 if (tp->t_canq.c_cc == 1) 401 (void) getc(&tp->t_canq); 402 if (tp->t_canq.c_cc) 403 return (error); 404 } else 405 if (tp->t_oproc) 406 error = (*tp->t_linesw->l_read)(tp, uio, flag); 407 ptcwakeup(tp, FWRITE); 408 return (error); 409 } 410 411 /* 412 * Write to pseudo-tty. 413 * Wakeups of controlling tty will happen 414 * indirectly, when tty driver calls ptsstart. 415 */ 416 int 417 ptswrite(dev, uio, flag) 418 dev_t dev; 419 struct uio *uio; 420 int flag; 421 { 422 struct pt_softc *pti = pt_softc[minor(dev)]; 423 struct tty *tp = pti->pt_tty; 424 425 if (tp->t_oproc == 0) 426 return (EIO); 427 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 428 } 429 430 /* 431 * Poll pseudo-tty. 432 */ 433 int 434 ptspoll(dev, events, p) 435 dev_t dev; 436 int events; 437 struct proc *p; 438 { 439 struct pt_softc *pti = pt_softc[minor(dev)]; 440 struct tty *tp = pti->pt_tty; 441 442 if (tp->t_oproc == 0) 443 return (EIO); 444 445 return ((*tp->t_linesw->l_poll)(tp, events, p)); 446 } 447 448 /* 449 * Start output on pseudo-tty. 450 * Wake up process polling or sleeping for input from controlling tty. 451 */ 452 void 453 ptsstart(tp) 454 struct tty *tp; 455 { 456 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 457 458 if (ISSET(tp->t_state, TS_TTSTOP)) 459 return; 460 if (pti->pt_flags & PF_STOPPED) { 461 pti->pt_flags &= ~PF_STOPPED; 462 pti->pt_send = TIOCPKT_START; 463 } 464 ptcwakeup(tp, FREAD); 465 } 466 467 void 468 ptsstop(tp, flush) 469 struct tty *tp; 470 int flush; 471 { 472 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 473 int flag; 474 475 /* note: FLUSHREAD and FLUSHWRITE already ok */ 476 if (flush == 0) { 477 flush = TIOCPKT_STOP; 478 pti->pt_flags |= PF_STOPPED; 479 } else 480 pti->pt_flags &= ~PF_STOPPED; 481 pti->pt_send |= flush; 482 /* change of perspective */ 483 flag = 0; 484 if (flush & FREAD) 485 flag |= FWRITE; 486 if (flush & FWRITE) 487 flag |= FREAD; 488 ptcwakeup(tp, flag); 489 } 490 491 void 492 ptcwakeup(tp, flag) 493 struct tty *tp; 494 int flag; 495 { 496 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 497 498 if (flag & FREAD) { 499 selnotify(&pti->pt_selr, 0); 500 wakeup((caddr_t)&tp->t_outq.c_cf); 501 } 502 if (flag & FWRITE) { 503 selnotify(&pti->pt_selw, 0); 504 wakeup((caddr_t)&tp->t_rawq.c_cf); 505 } 506 } 507 508 /*ARGSUSED*/ 509 int 510 ptcopen(dev, flag, devtype, p) 511 dev_t dev; 512 int flag, devtype; 513 struct proc *p; 514 { 515 struct pt_softc *pti; 516 struct tty *tp; 517 int error; 518 519 if ((error = check_pty(dev))) 520 return (error); 521 522 pti = pt_softc[minor(dev)]; 523 tp = pti->pt_tty; 524 525 if (tp->t_oproc) 526 return (EIO); 527 tp->t_oproc = ptsstart; 528 (void)(*tp->t_linesw->l_modem)(tp, 1); 529 CLR(tp->t_lflag, EXTPROC); 530 pti->pt_flags = 0; 531 pti->pt_send = 0; 532 pti->pt_ucntl = 0; 533 return (0); 534 } 535 536 /*ARGSUSED*/ 537 int 538 ptcclose(dev, flag, devtype, p) 539 dev_t dev; 540 int flag, devtype; 541 struct proc *p; 542 { 543 struct pt_softc *pti = pt_softc[minor(dev)]; 544 struct tty *tp = pti->pt_tty; 545 546 (void)(*tp->t_linesw->l_modem)(tp, 0); 547 CLR(tp->t_state, TS_CARR_ON); 548 tp->t_oproc = 0; /* mark closed */ 549 return (0); 550 } 551 552 int 553 ptcread(dev, uio, flag) 554 dev_t dev; 555 struct uio *uio; 556 int flag; 557 { 558 struct pt_softc *pti = pt_softc[minor(dev)]; 559 struct tty *tp = pti->pt_tty; 560 char buf[BUFSIZ]; 561 int error = 0, cc; 562 563 /* 564 * We want to block until the slave 565 * is open, and there's something to read; 566 * but if we lost the slave or we're NBIO, 567 * then return the appropriate error instead. 568 */ 569 for (;;) { 570 if (ISSET(tp->t_state, TS_ISOPEN)) { 571 if (pti->pt_flags&PF_PKT && pti->pt_send) { 572 error = ureadc((int)pti->pt_send, uio); 573 if (error) 574 return (error); 575 if (pti->pt_send & TIOCPKT_IOCTL) { 576 cc = min(uio->uio_resid, 577 sizeof(tp->t_termios)); 578 uiomove((caddr_t) &tp->t_termios, 579 cc, uio); 580 } 581 pti->pt_send = 0; 582 return (0); 583 } 584 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 585 error = ureadc((int)pti->pt_ucntl, uio); 586 if (error) 587 return (error); 588 pti->pt_ucntl = 0; 589 return (0); 590 } 591 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 592 break; 593 } 594 if (!ISSET(tp->t_state, TS_CARR_ON)) 595 return (0); /* EOF */ 596 if (flag & IO_NDELAY) 597 return (EWOULDBLOCK); 598 error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH, 599 ttyin, 0); 600 if (error) 601 return (error); 602 } 603 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 604 error = ureadc(0, uio); 605 while (uio->uio_resid > 0 && error == 0) { 606 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 607 if (cc <= 0) 608 break; 609 error = uiomove(buf, cc, uio); 610 } 611 if (tp->t_outq.c_cc <= tp->t_lowat) { 612 if (ISSET(tp->t_state, TS_ASLEEP)) { 613 CLR(tp->t_state, TS_ASLEEP); 614 wakeup((caddr_t)&tp->t_outq); 615 } 616 selnotify(&tp->t_wsel, 0); 617 } 618 return (error); 619 } 620 621 622 int 623 ptcwrite(dev, uio, flag) 624 dev_t dev; 625 struct uio *uio; 626 int flag; 627 { 628 struct pt_softc *pti = pt_softc[minor(dev)]; 629 struct tty *tp = pti->pt_tty; 630 u_char *cp = NULL; 631 int cc = 0; 632 u_char locbuf[BUFSIZ]; 633 int cnt = 0; 634 int error = 0; 635 636 again: 637 if (!ISSET(tp->t_state, TS_ISOPEN)) 638 goto block; 639 if (pti->pt_flags & PF_REMOTE) { 640 if (tp->t_canq.c_cc) 641 goto block; 642 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 643 if (cc == 0) { 644 cc = min(uio->uio_resid, BUFSIZ); 645 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 646 cp = locbuf; 647 error = uiomove((caddr_t)cp, cc, uio); 648 if (error) 649 return (error); 650 /* check again for safety */ 651 if (!ISSET(tp->t_state, TS_ISOPEN)) 652 return (EIO); 653 } 654 if (cc) 655 (void) b_to_q((char *)cp, cc, &tp->t_canq); 656 cc = 0; 657 } 658 (void) putc(0, &tp->t_canq); 659 ttwakeup(tp); 660 wakeup((caddr_t)&tp->t_canq); 661 return (0); 662 } 663 while (uio->uio_resid > 0) { 664 if (cc == 0) { 665 cc = min(uio->uio_resid, BUFSIZ); 666 cp = locbuf; 667 error = uiomove((caddr_t)cp, cc, uio); 668 if (error) 669 return (error); 670 /* check again for safety */ 671 if (!ISSET(tp->t_state, TS_ISOPEN)) 672 return (EIO); 673 } 674 while (cc > 0) { 675 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 676 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_lflag, ICANON))) { 677 wakeup((caddr_t)&tp->t_rawq); 678 goto block; 679 } 680 (*tp->t_linesw->l_rint)(*cp++, tp); 681 cnt++; 682 cc--; 683 } 684 cc = 0; 685 } 686 return (0); 687 block: 688 /* 689 * Come here to wait for slave to open, for space 690 * in outq, or space in rawq. 691 */ 692 if (!ISSET(tp->t_state, TS_CARR_ON)) 693 return (EIO); 694 if (flag & IO_NDELAY) { 695 /* adjust for data copied in but not written */ 696 uio->uio_resid += cc; 697 if (cnt == 0) 698 return (EWOULDBLOCK); 699 return (0); 700 } 701 error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 702 ttyout, 0); 703 if (error) { 704 /* adjust for data copied in but not written */ 705 uio->uio_resid += cc; 706 return (error); 707 } 708 goto again; 709 } 710 711 int 712 ptcpoll(dev, events, p) 713 dev_t dev; 714 int events; 715 struct proc *p; 716 { 717 struct pt_softc *pti = pt_softc[minor(dev)]; 718 struct tty *tp = pti->pt_tty; 719 int revents = 0; 720 int s = splsoftclock(); 721 722 if (events & (POLLIN | POLLRDNORM)) 723 if (ISSET(tp->t_state, TS_ISOPEN) && 724 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 725 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 726 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 727 revents |= events & (POLLIN | POLLRDNORM); 728 729 if (events & (POLLOUT | POLLWRNORM)) 730 if (ISSET(tp->t_state, TS_ISOPEN) && 731 ((pti->pt_flags & PF_REMOTE) ? 732 (tp->t_canq.c_cc == 0) : 733 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 734 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))) 735 revents |= events & (POLLOUT | POLLWRNORM); 736 737 if (events & POLLHUP) 738 if (!ISSET(tp->t_state, TS_CARR_ON)) 739 revents |= POLLHUP; 740 741 if (revents == 0) { 742 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 743 selrecord(p, &pti->pt_selr); 744 745 if (events & (POLLOUT | POLLWRNORM)) 746 selrecord(p, &pti->pt_selw); 747 } 748 749 splx(s); 750 return (revents); 751 } 752 753 static void 754 filt_ptcrdetach(struct knote *kn) 755 { 756 struct pt_softc *pti; 757 int s; 758 759 pti = kn->kn_hook; 760 s = spltty(); 761 SLIST_REMOVE(&pti->pt_selr.sel_klist, kn, knote, kn_selnext); 762 splx(s); 763 } 764 765 static int 766 filt_ptcread(struct knote *kn, long hint) 767 { 768 struct pt_softc *pti; 769 struct tty *tp; 770 int canread; 771 772 pti = kn->kn_hook; 773 tp = pti->pt_tty; 774 775 canread = (ISSET(tp->t_state, TS_ISOPEN) && 776 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 777 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 778 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))); 779 780 if (canread) { 781 /* 782 * c_cc is number of characters after output post-processing; 783 * the amount of data actually read(2) depends on 784 * setting of input flags for the terminal. 785 */ 786 kn->kn_data = tp->t_outq.c_cc; 787 if (((pti->pt_flags & PF_PKT) && pti->pt_send) || 788 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)) 789 kn->kn_data++; 790 } 791 792 return (canread); 793 } 794 795 static void 796 filt_ptcwdetach(struct knote *kn) 797 { 798 struct pt_softc *pti; 799 int s; 800 801 pti = kn->kn_hook; 802 s = spltty(); 803 SLIST_REMOVE(&pti->pt_selw.sel_klist, kn, knote, kn_selnext); 804 splx(s); 805 } 806 807 static int 808 filt_ptcwrite(struct knote *kn, long hint) 809 { 810 struct pt_softc *pti; 811 struct tty *tp; 812 int canwrite; 813 int nwrite; 814 815 pti = kn->kn_hook; 816 tp = pti->pt_tty; 817 818 canwrite = (ISSET(tp->t_state, TS_ISOPEN) && 819 ((pti->pt_flags & PF_REMOTE) ? 820 (tp->t_canq.c_cc == 0) : 821 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 822 (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))); 823 824 if (canwrite) { 825 if (pti->pt_flags & PF_REMOTE) 826 nwrite = tp->t_canq.c_cn; 827 else { 828 /* this is guaranteed to be > 0 due to above check */ 829 nwrite = tp->t_canq.c_cn 830 - (tp->t_rawq.c_cc + tp->t_canq.c_cc); 831 } 832 kn->kn_data = nwrite; 833 } 834 835 return (canwrite); 836 } 837 838 static const struct filterops ptcread_filtops = 839 { 1, NULL, filt_ptcrdetach, filt_ptcread }; 840 static const struct filterops ptcwrite_filtops = 841 { 1, NULL, filt_ptcwdetach, filt_ptcwrite }; 842 843 int 844 ptckqfilter(dev_t dev, struct knote *kn) 845 { 846 struct pt_softc *pti = pt_softc[minor(dev)]; 847 struct klist *klist; 848 int s; 849 850 switch (kn->kn_filter) { 851 case EVFILT_READ: 852 klist = &pti->pt_selr.sel_klist; 853 kn->kn_fop = &ptcread_filtops; 854 break; 855 case EVFILT_WRITE: 856 klist = &pti->pt_selw.sel_klist; 857 kn->kn_fop = &ptcwrite_filtops; 858 break; 859 default: 860 return (1); 861 } 862 863 kn->kn_hook = pti; 864 865 s = spltty(); 866 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 867 splx(s); 868 869 return (0); 870 } 871 872 struct tty * 873 ptytty(dev) 874 dev_t dev; 875 { 876 struct pt_softc *pti = pt_softc[minor(dev)]; 877 struct tty *tp = pti->pt_tty; 878 879 return (tp); 880 } 881 882 /*ARGSUSED*/ 883 int 884 ptyioctl(dev, cmd, data, flag, p) 885 dev_t dev; 886 u_long cmd; 887 caddr_t data; 888 int flag; 889 struct proc *p; 890 { 891 struct pt_softc *pti = pt_softc[minor(dev)]; 892 struct tty *tp = pti->pt_tty; 893 const struct cdevsw *cdev; 894 u_char *cc = tp->t_cc; 895 int stop, error, sig; 896 897 cdev = cdevsw_lookup(dev); 898 /* 899 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 900 * ttywflush(tp) will hang if there are characters in the outq. 901 */ 902 if (cmd == TIOCEXT) { 903 /* 904 * When the EXTPROC bit is being toggled, we need 905 * to send an TIOCPKT_IOCTL if the packet driver 906 * is turned on. 907 */ 908 if (*(int *)data) { 909 if (pti->pt_flags & PF_PKT) { 910 pti->pt_send |= TIOCPKT_IOCTL; 911 ptcwakeup(tp, FREAD); 912 } 913 SET(tp->t_lflag, EXTPROC); 914 } else { 915 if (ISSET(tp->t_lflag, EXTPROC) && 916 (pti->pt_flags & PF_PKT)) { 917 pti->pt_send |= TIOCPKT_IOCTL; 918 ptcwakeup(tp, FREAD); 919 } 920 CLR(tp->t_lflag, EXTPROC); 921 } 922 return(0); 923 } else 924 if (cdev != NULL && cdev->d_open == ptcopen) 925 switch (cmd) { 926 927 case TIOCGPGRP: 928 /* 929 * We avoid calling ttioctl on the controller since, 930 * in that case, tp must be the controlling terminal. 931 */ 932 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 933 return (0); 934 935 case TIOCPKT: 936 if (*(int *)data) { 937 if (pti->pt_flags & PF_UCNTL) 938 return (EINVAL); 939 pti->pt_flags |= PF_PKT; 940 } else 941 pti->pt_flags &= ~PF_PKT; 942 return (0); 943 944 case TIOCUCNTL: 945 if (*(int *)data) { 946 if (pti->pt_flags & PF_PKT) 947 return (EINVAL); 948 pti->pt_flags |= PF_UCNTL; 949 } else 950 pti->pt_flags &= ~PF_UCNTL; 951 return (0); 952 953 case TIOCREMOTE: 954 if (*(int *)data) 955 pti->pt_flags |= PF_REMOTE; 956 else 957 pti->pt_flags &= ~PF_REMOTE; 958 ttyflush(tp, FREAD|FWRITE); 959 return (0); 960 961 #ifdef COMPAT_OLDTTY 962 case TIOCSETP: 963 case TIOCSETN: 964 #endif 965 case TIOCSETD: 966 case TIOCSETA: 967 case TIOCSETAW: 968 case TIOCSETAF: 969 ndflush(&tp->t_outq, tp->t_outq.c_cc); 970 break; 971 972 case TIOCSIG: 973 sig = (int)(long)*(caddr_t *)data; 974 if (sig <= 0 || sig >= NSIG) 975 return (EINVAL); 976 if (!ISSET(tp->t_lflag, NOFLSH)) 977 ttyflush(tp, FREAD|FWRITE); 978 if ((sig == SIGINFO) && 979 (!ISSET(tp->t_lflag, NOKERNINFO))) 980 ttyinfo(tp); 981 pgsignal(tp->t_pgrp, sig, 1); 982 return(0); 983 } 984 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 985 if (error == EPASSTHROUGH) 986 error = ttioctl(tp, cmd, data, flag, p); 987 if (error == EPASSTHROUGH) { 988 if (pti->pt_flags & PF_UCNTL && 989 (cmd & ~0xff) == UIOCCMD(0)) { 990 if (cmd & 0xff) { 991 pti->pt_ucntl = (u_char)cmd; 992 ptcwakeup(tp, FREAD); 993 } 994 return (0); 995 } 996 } 997 /* 998 * If external processing and packet mode send ioctl packet. 999 */ 1000 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 1001 switch(cmd) { 1002 case TIOCSETA: 1003 case TIOCSETAW: 1004 case TIOCSETAF: 1005 #ifdef COMPAT_OLDTTY 1006 case TIOCSETP: 1007 case TIOCSETN: 1008 case TIOCSETC: 1009 case TIOCSLTC: 1010 case TIOCLBIS: 1011 case TIOCLBIC: 1012 case TIOCLSET: 1013 #endif 1014 pti->pt_send |= TIOCPKT_IOCTL; 1015 ptcwakeup(tp, FREAD); 1016 default: 1017 break; 1018 } 1019 } 1020 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 1021 && CCEQ(cc[VSTART], CTRL('q')); 1022 if (pti->pt_flags & PF_NOSTOP) { 1023 if (stop) { 1024 pti->pt_send &= ~TIOCPKT_NOSTOP; 1025 pti->pt_send |= TIOCPKT_DOSTOP; 1026 pti->pt_flags &= ~PF_NOSTOP; 1027 ptcwakeup(tp, FREAD); 1028 } 1029 } else { 1030 if (!stop) { 1031 pti->pt_send &= ~TIOCPKT_DOSTOP; 1032 pti->pt_send |= TIOCPKT_NOSTOP; 1033 pti->pt_flags |= PF_NOSTOP; 1034 ptcwakeup(tp, FREAD); 1035 } 1036 } 1037 return (error); 1038 } 1039