tty_pty.c revision 1.47
1 /* $NetBSD: tty_pty.c,v 1.47 2000/09/09 16:42:04 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 "opt_compat_sunos.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/ioctl.h> 48 #include <sys/proc.h> 49 #include <sys/tty.h> 50 #include <sys/file.h> 51 #include <sys/uio.h> 52 #include <sys/kernel.h> 53 #include <sys/vnode.h> 54 #include <sys/signalvar.h> 55 #include <sys/uio.h> 56 #include <sys/conf.h> 57 #include <sys/poll.h> 58 #include <sys/malloc.h> 59 60 #define DEFAULT_NPTYS 16 /* default number of initial ptys */ 61 #define DEFAULT_MAXPTYS 512 /* default maximum number of ptys */ 62 63 /* Macros to clear/set/test flags. */ 64 #define SET(t, f) (t) |= (f) 65 #define CLR(t, f) (t) &= ~((unsigned)(f)) 66 #define ISSET(t, f) ((t) & (f)) 67 68 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 69 70 /* 71 * pts == /dev/tty[pqrs]? 72 * ptc == /dev/pty[pqrs]? 73 */ 74 struct pt_softc { 75 struct tty *pt_tty; 76 int pt_flags; 77 struct selinfo pt_selr, pt_selw; 78 u_char pt_send; 79 u_char pt_ucntl; 80 }; 81 82 struct pt_softc **pt_softc = NULL; /* pty array */ 83 int npty = 0; /* for pstat -t */ 84 int maxptys = DEFAULT_MAXPTYS; /* maximum number of ptys (sysctable) */ 85 struct lock pt_softc_lock; 86 87 #define PF_PKT 0x08 /* packet mode */ 88 #define PF_STOPPED 0x10 /* user told stopped */ 89 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 90 #define PF_NOSTOP 0x40 91 #define PF_UCNTL 0x80 /* user control mode */ 92 93 void ptyattach __P((int)); 94 void ptcwakeup __P((struct tty *, int)); 95 int ptcopen __P((dev_t, int, int, struct proc *)); 96 struct tty *ptytty __P((dev_t)); 97 void ptsstart __P((struct tty *)); 98 99 static struct pt_softc **ptyarralloc __P((int)); 100 static int check_pty __P((dev_t)); 101 102 /* 103 * Allocate array of nelem elements. 104 */ 105 static struct pt_softc ** 106 ptyarralloc(nelem) 107 int nelem; 108 { 109 struct pt_softc **pt; 110 nelem += 10; 111 pt = malloc(nelem * sizeof(struct pt_softc *), M_DEVBUF, M_WAITOK); 112 memset(pt, '\0', nelem * sizeof(struct pt_softc *)); 113 return pt; 114 } 115 116 /* 117 * Check if the minor is correct and ensure necessary structures 118 * are properly allocated. 119 */ 120 static int 121 check_pty(dev) 122 dev_t dev; 123 { 124 struct pt_softc *pti; 125 int locked = 0; 126 127 if (minor(dev) >= maxptys) { 128 tablefull("pty", "increase kern.maxptys"); 129 return (ENXIO); 130 } 131 132 if (minor(dev) >= npty) { 133 struct pt_softc **newpt; 134 int newnpty = npty; 135 136 while(newnpty <= minor(dev)) 137 newnpty *= 2; 138 if (newnpty > maxptys) 139 newnpty = maxptys; 140 141 newpt = ptyarralloc(newnpty); 142 143 /* 144 * Now grab the pty array lock. We need to ensure 145 * that the pty array is consistent while copying it's 146 * content to newly allocated, larger space. 147 */ 148 lockmgr(&pt_softc_lock, LK_EXCLUSIVE, NULL); 149 locked = 1; 150 151 /* 152 * If the number of ptys is still not enough, replace 153 * the old array with the newly allocated one. 154 */ 155 if (minor(dev) >= npty) { 156 /* 157 * Copy old pt_softc[] contents over, free old 158 * array and start using new array. 159 */ 160 memcpy(newpt, pt_softc, npty*sizeof(struct pt_softc *)); 161 free(pt_softc, M_DEVBUF); 162 163 pt_softc = newpt; 164 npty = newnpty; 165 } else { 166 /* has been enlarged while we slept, free space */ 167 free(newpt, M_DEVBUF); 168 } 169 } 170 171 /* 172 * If the entry is not yet allocated, allocate one. The lock is 173 * needed so that the state of pt_softc[] arrat is consistant 174 * should it be longened above. Though we might use shared lock 175 * here and use 176 * 177 */ 178 if (!pt_softc[minor(dev)]) { 179 if (!locked) { 180 lockmgr(&pt_softc_lock, LK_EXCLUSIVE, NULL); 181 locked = 1; 182 } 183 184 /* 185 * Check the entry again - the entry might have been 186 * added while we were waiting for lock. 187 */ 188 if (!pt_softc[minor(dev)]) { 189 MALLOC(pti, struct pt_softc *, sizeof(struct pt_softc), 190 M_DEVBUF, M_WAITOK); 191 192 pti->pt_tty = ttymalloc(); 193 tty_attach(pti->pt_tty); 194 195 pt_softc[minor(dev)] = pti; 196 } 197 } 198 199 if (locked) 200 lockmgr(&pt_softc_lock, LK_RELEASE, NULL); 201 202 return (0); 203 } 204 205 /* 206 * Establish n (or default if n is 1) ptys in the system. 207 */ 208 void 209 ptyattach(n) 210 int n; 211 { 212 /* maybe should allow 0 => none? */ 213 if (n <= 1) 214 n = DEFAULT_NPTYS; 215 pt_softc = ptyarralloc(n); 216 npty = n; 217 218 lockinit(&pt_softc_lock, PWAIT, "ptyarrlk", 0, 0); 219 } 220 221 /*ARGSUSED*/ 222 int 223 ptsopen(dev, flag, devtype, p) 224 dev_t dev; 225 int flag, devtype; 226 struct proc *p; 227 { 228 struct pt_softc *pti; 229 struct tty *tp; 230 int error; 231 232 if ((error = check_pty(dev))) 233 return (error); 234 235 pti = pt_softc[minor(dev)]; 236 tp = pti->pt_tty; 237 238 if (!ISSET(tp->t_state, TS_ISOPEN)) { 239 ttychars(tp); /* Set up default chars */ 240 tp->t_iflag = TTYDEF_IFLAG; 241 tp->t_oflag = TTYDEF_OFLAG; 242 tp->t_lflag = TTYDEF_LFLAG; 243 tp->t_cflag = TTYDEF_CFLAG; 244 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 245 ttsetwater(tp); /* would be done in xxparam() */ 246 } else if (ISSET(tp->t_state, TS_XCLUDE) && p->p_ucred->cr_uid != 0) 247 return (EBUSY); 248 if (tp->t_oproc) /* Ctrlr still around. */ 249 SET(tp->t_state, TS_CARR_ON); 250 if (!ISSET(flag, O_NONBLOCK)) 251 while (!ISSET(tp->t_state, TS_CARR_ON)) { 252 tp->t_wopen++; 253 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, 254 ttopen, 0); 255 tp->t_wopen--; 256 if (error) 257 return (error); 258 } 259 error = (*linesw[tp->t_line].l_open)(dev, tp); 260 ptcwakeup(tp, FREAD|FWRITE); 261 return (error); 262 } 263 264 int 265 ptsclose(dev, flag, mode, p) 266 dev_t dev; 267 int flag, mode; 268 struct proc *p; 269 { 270 struct pt_softc *pti = pt_softc[minor(dev)]; 271 struct tty *tp = pti->pt_tty; 272 int error; 273 274 error = (*linesw[tp->t_line].l_close)(tp, flag); 275 error |= ttyclose(tp); 276 ptcwakeup(tp, FREAD|FWRITE); 277 return (error); 278 } 279 280 int 281 ptsread(dev, uio, flag) 282 dev_t dev; 283 struct uio *uio; 284 int flag; 285 { 286 struct proc *p = curproc; 287 struct pt_softc *pti = pt_softc[minor(dev)]; 288 struct tty *tp = pti->pt_tty; 289 int error = 0; 290 291 again: 292 if (pti->pt_flags & PF_REMOTE) { 293 while (isbackground(p, tp)) { 294 if (sigismember(&p->p_sigignore, SIGTTIN) || 295 sigismember(&p->p_sigmask, SIGTTIN) || 296 p->p_pgrp->pg_jobc == 0 || 297 p->p_flag & P_PPWAIT) 298 return (EIO); 299 pgsignal(p->p_pgrp, SIGTTIN, 1); 300 error = ttysleep(tp, (caddr_t)&lbolt, 301 TTIPRI | PCATCH, ttybg, 0); 302 if (error) 303 return (error); 304 } 305 if (tp->t_canq.c_cc == 0) { 306 if (flag & IO_NDELAY) 307 return (EWOULDBLOCK); 308 error = ttysleep(tp, (caddr_t)&tp->t_canq, 309 TTIPRI | PCATCH, ttyin, 0); 310 if (error) 311 return (error); 312 goto again; 313 } 314 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 315 if (ureadc(getc(&tp->t_canq), uio) < 0) { 316 error = EFAULT; 317 break; 318 } 319 if (tp->t_canq.c_cc == 1) 320 (void) getc(&tp->t_canq); 321 if (tp->t_canq.c_cc) 322 return (error); 323 } else 324 if (tp->t_oproc) 325 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 326 ptcwakeup(tp, FWRITE); 327 return (error); 328 } 329 330 /* 331 * Write to pseudo-tty. 332 * Wakeups of controlling tty will happen 333 * indirectly, when tty driver calls ptsstart. 334 */ 335 int 336 ptswrite(dev, uio, flag) 337 dev_t dev; 338 struct uio *uio; 339 int flag; 340 { 341 struct pt_softc *pti = pt_softc[minor(dev)]; 342 struct tty *tp = pti->pt_tty; 343 344 if (tp->t_oproc == 0) 345 return (EIO); 346 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 347 } 348 349 /* 350 * Start output on pseudo-tty. 351 * Wake up process polling or sleeping for input from controlling tty. 352 */ 353 void 354 ptsstart(tp) 355 struct tty *tp; 356 { 357 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 358 359 if (ISSET(tp->t_state, TS_TTSTOP)) 360 return; 361 if (pti->pt_flags & PF_STOPPED) { 362 pti->pt_flags &= ~PF_STOPPED; 363 pti->pt_send = TIOCPKT_START; 364 } 365 ptcwakeup(tp, FREAD); 366 } 367 368 void 369 ptsstop(tp, flush) 370 struct tty *tp; 371 int flush; 372 { 373 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 374 int flag; 375 376 /* note: FLUSHREAD and FLUSHWRITE already ok */ 377 if (flush == 0) { 378 flush = TIOCPKT_STOP; 379 pti->pt_flags |= PF_STOPPED; 380 } else 381 pti->pt_flags &= ~PF_STOPPED; 382 pti->pt_send |= flush; 383 /* change of perspective */ 384 flag = 0; 385 if (flush & FREAD) 386 flag |= FWRITE; 387 if (flush & FWRITE) 388 flag |= FREAD; 389 ptcwakeup(tp, flag); 390 } 391 392 void 393 ptcwakeup(tp, flag) 394 struct tty *tp; 395 int flag; 396 { 397 struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; 398 399 if (flag & FREAD) { 400 selwakeup(&pti->pt_selr); 401 wakeup((caddr_t)&tp->t_outq.c_cf); 402 } 403 if (flag & FWRITE) { 404 selwakeup(&pti->pt_selw); 405 wakeup((caddr_t)&tp->t_rawq.c_cf); 406 } 407 } 408 409 /*ARGSUSED*/ 410 int 411 ptcopen(dev, flag, devtype, p) 412 dev_t dev; 413 int flag, devtype; 414 struct proc *p; 415 { 416 struct pt_softc *pti; 417 struct tty *tp; 418 int error; 419 420 if ((error = check_pty(dev))) 421 return (error); 422 423 pti = pt_softc[minor(dev)]; 424 tp = pti->pt_tty; 425 426 if (tp->t_oproc) 427 return (EIO); 428 tp->t_oproc = ptsstart; 429 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 430 CLR(tp->t_lflag, EXTPROC); 431 pti->pt_flags = 0; 432 pti->pt_send = 0; 433 pti->pt_ucntl = 0; 434 return (0); 435 } 436 437 /*ARGSUSED*/ 438 int 439 ptcclose(dev, flag, devtype, p) 440 dev_t dev; 441 int flag, devtype; 442 struct proc *p; 443 { 444 struct pt_softc *pti = pt_softc[minor(dev)]; 445 struct tty *tp = pti->pt_tty; 446 447 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 448 CLR(tp->t_state, TS_CARR_ON); 449 tp->t_oproc = 0; /* mark closed */ 450 return (0); 451 } 452 453 int 454 ptcread(dev, uio, flag) 455 dev_t dev; 456 struct uio *uio; 457 int flag; 458 { 459 struct pt_softc *pti = pt_softc[minor(dev)]; 460 struct tty *tp = pti->pt_tty; 461 char buf[BUFSIZ]; 462 int error = 0, cc; 463 464 /* 465 * We want to block until the slave 466 * is open, and there's something to read; 467 * but if we lost the slave or we're NBIO, 468 * then return the appropriate error instead. 469 */ 470 for (;;) { 471 if (ISSET(tp->t_state, TS_ISOPEN)) { 472 if (pti->pt_flags&PF_PKT && pti->pt_send) { 473 error = ureadc((int)pti->pt_send, uio); 474 if (error) 475 return (error); 476 if (pti->pt_send & TIOCPKT_IOCTL) { 477 cc = min(uio->uio_resid, 478 sizeof(tp->t_termios)); 479 uiomove((caddr_t) &tp->t_termios, 480 cc, uio); 481 } 482 pti->pt_send = 0; 483 return (0); 484 } 485 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 486 error = ureadc((int)pti->pt_ucntl, uio); 487 if (error) 488 return (error); 489 pti->pt_ucntl = 0; 490 return (0); 491 } 492 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 493 break; 494 } 495 if (!ISSET(tp->t_state, TS_CARR_ON)) 496 return (0); /* EOF */ 497 if (flag & IO_NDELAY) 498 return (EWOULDBLOCK); 499 error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH, 500 ttyin, 0); 501 if (error) 502 return (error); 503 } 504 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 505 error = ureadc(0, uio); 506 while (uio->uio_resid > 0 && error == 0) { 507 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 508 if (cc <= 0) 509 break; 510 error = uiomove(buf, cc, uio); 511 } 512 if (tp->t_outq.c_cc <= tp->t_lowat) { 513 if (ISSET(tp->t_state, TS_ASLEEP)) { 514 CLR(tp->t_state, TS_ASLEEP); 515 wakeup((caddr_t)&tp->t_outq); 516 } 517 selwakeup(&tp->t_wsel); 518 } 519 return (error); 520 } 521 522 523 int 524 ptcwrite(dev, uio, flag) 525 dev_t dev; 526 struct uio *uio; 527 int flag; 528 { 529 struct pt_softc *pti = pt_softc[minor(dev)]; 530 struct tty *tp = pti->pt_tty; 531 u_char *cp = NULL; 532 int cc = 0; 533 u_char locbuf[BUFSIZ]; 534 int cnt = 0; 535 int error = 0; 536 537 again: 538 if (!ISSET(tp->t_state, TS_ISOPEN)) 539 goto block; 540 if (pti->pt_flags & PF_REMOTE) { 541 if (tp->t_canq.c_cc) 542 goto block; 543 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 544 if (cc == 0) { 545 cc = min(uio->uio_resid, BUFSIZ); 546 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 547 cp = locbuf; 548 error = uiomove((caddr_t)cp, cc, uio); 549 if (error) 550 return (error); 551 /* check again for safety */ 552 if (!ISSET(tp->t_state, TS_ISOPEN)) 553 return (EIO); 554 } 555 if (cc) 556 (void) b_to_q((char *)cp, cc, &tp->t_canq); 557 cc = 0; 558 } 559 (void) putc(0, &tp->t_canq); 560 ttwakeup(tp); 561 wakeup((caddr_t)&tp->t_canq); 562 return (0); 563 } 564 while (uio->uio_resid > 0) { 565 if (cc == 0) { 566 cc = min(uio->uio_resid, BUFSIZ); 567 cp = locbuf; 568 error = uiomove((caddr_t)cp, cc, uio); 569 if (error) 570 return (error); 571 /* check again for safety */ 572 if (!ISSET(tp->t_state, TS_ISOPEN)) 573 return (EIO); 574 } 575 while (cc > 0) { 576 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 577 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_iflag, ICANON))) { 578 wakeup((caddr_t)&tp->t_rawq); 579 goto block; 580 } 581 (*linesw[tp->t_line].l_rint)(*cp++, tp); 582 cnt++; 583 cc--; 584 } 585 cc = 0; 586 } 587 return (0); 588 block: 589 /* 590 * Come here to wait for slave to open, for space 591 * in outq, or space in rawq. 592 */ 593 if (!ISSET(tp->t_state, TS_CARR_ON)) 594 return (EIO); 595 if (flag & IO_NDELAY) { 596 /* adjust for data copied in but not written */ 597 uio->uio_resid += cc; 598 if (cnt == 0) 599 return (EWOULDBLOCK); 600 return (0); 601 } 602 error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 603 ttyout, 0); 604 if (error) { 605 /* adjust for data copied in but not written */ 606 uio->uio_resid += cc; 607 return (error); 608 } 609 goto again; 610 } 611 612 int 613 ptcpoll(dev, events, p) 614 dev_t dev; 615 int events; 616 struct proc *p; 617 { 618 struct pt_softc *pti = pt_softc[minor(dev)]; 619 struct tty *tp = pti->pt_tty; 620 int revents = 0; 621 int s = splsoftclock(); 622 623 if (events & (POLLIN | POLLRDNORM)) 624 if (ISSET(tp->t_state, TS_ISOPEN) && 625 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 626 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 627 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 628 revents |= events & (POLLIN | POLLRDNORM); 629 630 if (events & (POLLOUT | POLLWRNORM)) 631 if (ISSET(tp->t_state, TS_ISOPEN) && 632 ((pti->pt_flags & PF_REMOTE) ? 633 (tp->t_canq.c_cc == 0) : 634 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 635 (tp->t_canq.c_cc == 0 && ISSET(tp->t_iflag, ICANON))))) 636 revents |= events & (POLLOUT | POLLWRNORM); 637 638 if (events & POLLHUP) 639 if (!ISSET(tp->t_state, TS_CARR_ON)) 640 revents |= POLLHUP; 641 642 if (revents == 0) { 643 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 644 selrecord(p, &pti->pt_selr); 645 646 if (events & (POLLOUT | POLLWRNORM)) 647 selrecord(p, &pti->pt_selw); 648 } 649 650 splx(s); 651 return (revents); 652 } 653 654 655 struct tty * 656 ptytty(dev) 657 dev_t dev; 658 { 659 struct pt_softc *pti = pt_softc[minor(dev)]; 660 struct tty *tp = pti->pt_tty; 661 662 return (tp); 663 } 664 665 /*ARGSUSED*/ 666 int 667 ptyioctl(dev, cmd, data, flag, p) 668 dev_t dev; 669 u_long cmd; 670 caddr_t data; 671 int flag; 672 struct proc *p; 673 { 674 struct pt_softc *pti = pt_softc[minor(dev)]; 675 struct tty *tp = pti->pt_tty; 676 u_char *cc = tp->t_cc; 677 int stop, error, sig; 678 679 /* 680 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 681 * ttywflush(tp) will hang if there are characters in the outq. 682 */ 683 if (cmd == TIOCEXT) { 684 /* 685 * When the EXTPROC bit is being toggled, we need 686 * to send an TIOCPKT_IOCTL if the packet driver 687 * is turned on. 688 */ 689 if (*(int *)data) { 690 if (pti->pt_flags & PF_PKT) { 691 pti->pt_send |= TIOCPKT_IOCTL; 692 ptcwakeup(tp, FREAD); 693 } 694 SET(tp->t_lflag, EXTPROC); 695 } else { 696 if (ISSET(tp->t_lflag, EXTPROC) && 697 (pti->pt_flags & PF_PKT)) { 698 pti->pt_send |= TIOCPKT_IOCTL; 699 ptcwakeup(tp, FREAD); 700 } 701 CLR(tp->t_lflag, EXTPROC); 702 } 703 return(0); 704 } else 705 if (cdevsw[major(dev)].d_open == ptcopen) 706 switch (cmd) { 707 708 case TIOCGPGRP: 709 #ifdef COMPAT_SUNOS 710 { 711 /* 712 * I'm not sure about SunOS TIOCGPGRP semantics 713 * on PTYs, but it's something like this: 714 */ 715 extern struct emul emul_sunos; 716 if (p->p_emul == &emul_sunos && tp->t_pgrp == 0) 717 return (EIO); 718 *(int *)data = tp->t_pgrp->pg_id; 719 return (0); 720 } 721 #endif 722 /* 723 * We avoid calling ttioctl on the controller since, 724 * in that case, tp must be the controlling terminal. 725 */ 726 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 727 return (0); 728 729 case TIOCPKT: 730 if (*(int *)data) { 731 if (pti->pt_flags & PF_UCNTL) 732 return (EINVAL); 733 pti->pt_flags |= PF_PKT; 734 } else 735 pti->pt_flags &= ~PF_PKT; 736 return (0); 737 738 case TIOCUCNTL: 739 if (*(int *)data) { 740 if (pti->pt_flags & PF_PKT) 741 return (EINVAL); 742 pti->pt_flags |= PF_UCNTL; 743 } else 744 pti->pt_flags &= ~PF_UCNTL; 745 return (0); 746 747 case TIOCREMOTE: 748 if (*(int *)data) 749 pti->pt_flags |= PF_REMOTE; 750 else 751 pti->pt_flags &= ~PF_REMOTE; 752 ttyflush(tp, FREAD|FWRITE); 753 return (0); 754 755 #ifdef COMPAT_OLDTTY 756 case TIOCSETP: 757 case TIOCSETN: 758 #endif 759 case TIOCSETD: 760 case TIOCSETA: 761 case TIOCSETAW: 762 case TIOCSETAF: 763 ndflush(&tp->t_outq, tp->t_outq.c_cc); 764 break; 765 766 case TIOCSIG: 767 sig = (int)(long)*(caddr_t *)data; 768 if (sig <= 0 || sig >= NSIG) 769 return (EINVAL); 770 if (!ISSET(tp->t_lflag, NOFLSH)) 771 ttyflush(tp, FREAD|FWRITE); 772 pgsignal(tp->t_pgrp, sig, 1); 773 if ((sig == SIGINFO) && 774 (!ISSET(tp->t_lflag, NOKERNINFO))) 775 ttyinfo(tp); 776 return(0); 777 } 778 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 779 if (error < 0) 780 error = ttioctl(tp, cmd, data, flag, p); 781 if (error < 0) { 782 if (pti->pt_flags & PF_UCNTL && 783 (cmd & ~0xff) == UIOCCMD(0)) { 784 if (cmd & 0xff) { 785 pti->pt_ucntl = (u_char)cmd; 786 ptcwakeup(tp, FREAD); 787 } 788 return (0); 789 } 790 error = ENOTTY; 791 } 792 /* 793 * If external processing and packet mode send ioctl packet. 794 */ 795 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 796 switch(cmd) { 797 case TIOCSETA: 798 case TIOCSETAW: 799 case TIOCSETAF: 800 #ifdef COMPAT_OLDTTY 801 case TIOCSETP: 802 case TIOCSETN: 803 case TIOCSETC: 804 case TIOCSLTC: 805 case TIOCLBIS: 806 case TIOCLBIC: 807 case TIOCLSET: 808 #endif 809 pti->pt_send |= TIOCPKT_IOCTL; 810 ptcwakeup(tp, FREAD); 811 default: 812 break; 813 } 814 } 815 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 816 && CCEQ(cc[VSTART], CTRL('q')); 817 if (pti->pt_flags & PF_NOSTOP) { 818 if (stop) { 819 pti->pt_send &= ~TIOCPKT_NOSTOP; 820 pti->pt_send |= TIOCPKT_DOSTOP; 821 pti->pt_flags &= ~PF_NOSTOP; 822 ptcwakeup(tp, FREAD); 823 } 824 } else { 825 if (!stop) { 826 pti->pt_send &= ~TIOCPKT_DOSTOP; 827 pti->pt_send |= TIOCPKT_NOSTOP; 828 pti->pt_flags |= PF_NOSTOP; 829 ptcwakeup(tp, FREAD); 830 } 831 } 832 return (error); 833 } 834
Indexes created Sat Sep 27 22:09:54 GMT 2025