tty_pty.c revision 1.16
1 /* 2 * Copyright (c) 1982, 1986, 1989 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * from: @(#)tty_pty.c 7.21 (Berkeley) 5/30/91 34 * $Id: tty_pty.c,v 1.16 1993/12/18 04:22:16 mycroft Exp $ 35 */ 36 37 /* 38 * Pseudo-teletype Driver 39 * (Actually two drivers, requiring two entries in 'cdevsw') 40 */ 41 #include "pty.h" 42 43 #if NPTY > 0 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/ioctl.h> 47 #include <sys/select.h> 48 #include <sys/tty.h> 49 #include <sys/conf.h> 50 #include <sys/file.h> 51 #include <sys/proc.h> 52 #include <sys/uio.h> 53 #include <sys/kernel.h> 54 #include <sys/vnode.h> 55 56 #if NPTY == 1 57 #undef NPTY 58 #define NPTY 32 /* crude XXX */ 59 #endif 60 61 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 62 63 /* 64 * pts == /dev/tty[pqrs]? 65 * ptc == /dev/pty[pqrs]? 66 */ 67 struct tty *pt_tty[NPTY]; 68 struct pt_ioctl { 69 int pt_flags; 70 struct selinfo pt_selr, pt_selw; 71 u_char pt_send; 72 u_char pt_ucntl; 73 } pt_ioctl[NPTY]; 74 int npty = NPTY; /* for pstat -t */ 75 76 #define PF_COPEN 0x01 /* master open */ 77 #define PF_SOPEN 0x02 /* slave open */ 78 #define PF_PKT 0x08 /* packet mode */ 79 #define PF_STOPPED 0x10 /* user told stopped */ 80 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 81 #define PF_NOSTOP 0x40 82 #define PF_UCNTL 0x80 /* user control mode */ 83 84 void ptcwakeup __P((struct tty *tp, int flag)); 85 86 void 87 ptyattach(n) 88 int n; 89 { 90 } 91 92 /*ARGSUSED*/ 93 int 94 ptsopen(dev, flag, devtype, p) 95 dev_t dev; 96 int flag, devtype; 97 struct proc *p; 98 { 99 register struct tty *tp; 100 int error; 101 102 #ifdef lint 103 npty = npty; 104 #endif 105 if (minor(dev) >= NPTY) 106 return (ENXIO); 107 if(!pt_tty[minor(dev)]) { 108 tp = pt_tty[minor(dev)] = ttymalloc(); 109 } else 110 tp = pt_tty[minor(dev)]; 111 if ((tp->t_state & TS_ISOPEN) == 0) { 112 tp->t_state |= TS_WOPEN; 113 ttychars(tp); /* Set up default chars */ 114 tp->t_iflag = TTYDEF_IFLAG; 115 tp->t_oflag = TTYDEF_OFLAG; 116 tp->t_lflag = TTYDEF_LFLAG; 117 tp->t_cflag = TTYDEF_CFLAG; 118 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 119 ttsetwater(tp); /* would be done in xxparam() */ 120 } else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0) 121 return (EBUSY); 122 if (tp->t_oproc) /* Ctrlr still around. */ 123 tp->t_state |= TS_CARR_ON; 124 while ((tp->t_state & TS_CARR_ON) == 0) { 125 tp->t_state |= TS_WOPEN; 126 if (flag&FNONBLOCK) 127 break; 128 if (error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH, 129 ttopen, 0)) 130 return (error); 131 } 132 if (error = (*linesw[tp->t_line].l_open)(dev, tp)) 133 return (error); 134 pt_ioctl[minor(dev)].pt_flags |= PF_SOPEN; 135 ptcwakeup(tp, FREAD|FWRITE); 136 return (0); 137 } 138 139 int 140 ptsclose(dev, flag, mode, p) 141 dev_t dev; 142 int flag, mode; 143 struct proc *p; 144 { 145 register struct tty *tp; 146 147 tp = pt_tty[minor(dev)]; 148 (*linesw[tp->t_line].l_close)(tp, flag); 149 ttyclose(tp); 150 ptcwakeup(tp, FREAD|FWRITE); 151 pt_ioctl[minor(dev)].pt_flags &= ~PF_SOPEN; 152 #ifdef broken /* session holds a ref to the tty; can't deallocate */ 153 if ((pt_ioctl[minor(dev)].pt_flags & PF_COPEN) == 0) { 154 ttyfree(tp); 155 pt_tty[minor(dev)] = (struct tty *)NULL; 156 } 157 #endif 158 return(0); 159 } 160 161 int 162 ptsread(dev, uio, flag) 163 dev_t dev; 164 struct uio *uio; 165 int flag; 166 { 167 struct proc *p = curproc; 168 register struct tty *tp = pt_tty[minor(dev)]; 169 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 170 int error = 0; 171 172 again: 173 if (pti->pt_flags & PF_REMOTE) { 174 while (isbackground(p, tp)) { 175 if ((p->p_sigignore & sigmask(SIGTTIN)) || 176 (p->p_sigmask & sigmask(SIGTTIN)) || 177 p->p_pgrp->pg_jobc == 0 || 178 p->p_flag&SPPWAIT) 179 return (EIO); 180 pgsignal(p->p_pgrp, SIGTTIN, 1); 181 if (error = ttysleep(tp, (caddr_t)&lbolt, 182 TTIPRI | PCATCH, ttybg, 0)) 183 return (error); 184 } 185 if (tp->t_canq.c_cc == 0) { 186 if (flag & IO_NDELAY) 187 return (EWOULDBLOCK); 188 if (error = ttysleep(tp, (caddr_t)&tp->t_canq, 189 TTIPRI | PCATCH, ttyin, 0)) 190 return (error); 191 goto again; 192 } 193 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 194 if (ureadc(getc(&tp->t_canq), uio) < 0) { 195 error = EFAULT; 196 break; 197 } 198 if (tp->t_canq.c_cc == 1) 199 (void) getc(&tp->t_canq); 200 if (tp->t_canq.c_cc) 201 return (error); 202 } else 203 if (tp->t_oproc) 204 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 205 ptcwakeup(tp, FWRITE); 206 return (error); 207 } 208 209 /* 210 * Write to pseudo-tty. 211 * Wakeups of controlling tty will happen 212 * indirectly, when tty driver calls ptsstart. 213 */ 214 int 215 ptswrite(dev, uio, flag) 216 dev_t dev; 217 struct uio *uio; 218 int flag; 219 { 220 register struct tty *tp; 221 222 tp = pt_tty[minor(dev)]; 223 if (tp->t_oproc == 0) 224 return (EIO); 225 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 226 } 227 228 /* 229 * Start output on pseudo-tty. 230 * Wake up process selecting or sleeping for input from controlling tty. 231 */ 232 void 233 ptsstart(tp) 234 struct tty *tp; 235 { 236 register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 237 238 if (tp->t_state & TS_TTSTOP) 239 return; 240 if (pti->pt_flags & PF_STOPPED) { 241 pti->pt_flags &= ~PF_STOPPED; 242 pti->pt_send = TIOCPKT_START; 243 } 244 ptcwakeup(tp, FREAD); 245 return; 246 } 247 248 void 249 ptcwakeup(tp, flag) 250 struct tty *tp; 251 int flag; 252 { 253 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 254 255 if (flag & FREAD) { 256 selwakeup(&pti->pt_selr); 257 wakeup((caddr_t)&tp->t_outq.c_cl); 258 } 259 if (flag & FWRITE) { 260 selwakeup(&pti->pt_selw); 261 wakeup((caddr_t)&tp->t_rawq.c_cf); 262 } 263 } 264 265 /*ARGSUSED*/ 266 #ifdef __STDC__ 267 int 268 ptcopen(dev_t dev, int flag, int devtype, struct proc *p) 269 #else 270 int 271 ptcopen(dev, flag, devtype, p) 272 dev_t dev; 273 int flag, devtype; 274 struct proc *p; 275 #endif 276 { 277 register struct tty *tp; 278 struct pt_ioctl *pti; 279 280 if (minor(dev) >= NPTY) 281 return (ENXIO); 282 if(!pt_tty[minor(dev)]) { 283 tp = pt_tty[minor(dev)] = ttymalloc(); 284 } else 285 tp = pt_tty[minor(dev)]; 286 if (tp->t_oproc) 287 return (EIO); 288 tp->t_oproc = ptsstart; 289 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 290 tp->t_lflag &= ~EXTPROC; 291 pti = &pt_ioctl[minor(dev)]; 292 pti->pt_flags &= PF_SOPEN; 293 pti->pt_flags |= PF_COPEN; 294 pti->pt_send = 0; 295 pti->pt_ucntl = 0; 296 return (0); 297 } 298 299 extern struct tty *constty; /* -hv- 06.Oct.92*/ 300 301 int 302 ptcclose(dev) 303 dev_t dev; 304 { 305 register struct tty *tp; 306 307 tp = pt_tty[minor(dev)]; 308 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 309 tp->t_state &= ~TS_CARR_ON; 310 tp->t_oproc = 0; /* mark closed */ 311 312 /* XXX -hv- 6.Oct.92 this prevents the "hanging console bug" with X11 */ 313 if (constty==tp) 314 constty = 0; 315 316 pt_ioctl[minor(dev)].pt_flags &= ~PF_COPEN; 317 #ifdef broken 318 if ((pt_ioctl[minor(dev)].pt_flags & PF_SOPEN) == 0) { 319 ttyfree(tp); 320 pt_tty[minor(dev)] = (struct tty *)NULL; 321 } 322 #endif 323 return (0); 324 } 325 326 int 327 ptcread(dev, uio, flag) 328 dev_t dev; 329 struct uio *uio; 330 int flag; 331 { 332 register struct tty *tp = pt_tty[minor(dev)]; 333 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 334 u_char buf[BUFSIZ]; 335 int error = 0, cc; 336 337 /* 338 * We want to block until the slave 339 * is open, and there's something to read; 340 * but if we lost the slave or we're NBIO, 341 * then return the appropriate error instead. 342 */ 343 for (;;) { 344 if (tp->t_state&TS_ISOPEN) { 345 if (pti->pt_flags&PF_PKT && pti->pt_send) { 346 error = ureadc((int)pti->pt_send, uio); 347 if (error) 348 return (error); 349 if (pti->pt_send & TIOCPKT_IOCTL) { 350 cc = MIN(uio->uio_resid, 351 sizeof(tp->t_termios)); 352 uiomove((caddr_t)&tp->t_termios, cc, 353 uio); 354 } 355 pti->pt_send = 0; 356 return (0); 357 } 358 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 359 error = ureadc((int)pti->pt_ucntl, uio); 360 if (error) 361 return (error); 362 pti->pt_ucntl = 0; 363 return (0); 364 } 365 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 366 break; 367 } 368 if ((tp->t_state&TS_CARR_ON) == 0) 369 return (0); /* EOF */ 370 if (flag & IO_NDELAY) 371 return (EWOULDBLOCK); 372 if (error = tsleep((caddr_t)&tp->t_outq.c_cl, TTIPRI | PCATCH, 373 ttyin, 0)) 374 return (error); 375 } 376 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 377 error = ureadc(0, uio); 378 while (uio->uio_resid > 0 && error == 0) { 379 cc = q_to_b(&tp->t_outq, buf, MIN(uio->uio_resid, BUFSIZ)); 380 if (cc <= 0) 381 break; 382 error = uiomove(buf, cc, uio); 383 } 384 if (tp->t_outq.c_cc <= tp->t_lowat) { 385 if (tp->t_state&TS_ASLEEP) { 386 tp->t_state &= ~TS_ASLEEP; 387 wakeup((caddr_t)&tp->t_outq); 388 } 389 selwakeup(&tp->t_wsel); 390 } 391 return (error); 392 } 393 394 void 395 ptsstop(tp, flush) 396 register struct tty *tp; 397 int flush; 398 { 399 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 400 int flag; 401 402 /* note: FLUSHREAD and FLUSHWRITE already ok */ 403 if (flush == 0) { 404 flush = TIOCPKT_STOP; 405 pti->pt_flags |= PF_STOPPED; 406 } else 407 pti->pt_flags &= ~PF_STOPPED; 408 pti->pt_send |= flush; 409 /* change of perspective */ 410 flag = 0; 411 if (flush & FREAD) 412 flag |= FWRITE; 413 if (flush & FWRITE) 414 flag |= FREAD; 415 ptcwakeup(tp, flag); 416 } 417 418 int 419 ptcselect(dev, rw, p) 420 dev_t dev; 421 int rw; 422 struct proc *p; 423 { 424 register struct tty *tp = pt_tty[minor(dev)]; 425 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 426 int s; 427 428 if ((tp->t_state&TS_CARR_ON) == 0) 429 return (1); 430 switch (rw) { 431 432 case FREAD: 433 /* 434 * Need to block timeouts (ttrstart). 435 */ 436 s = spltty(); 437 if ((tp->t_state&TS_ISOPEN) && 438 tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) { 439 splx(s); 440 return (1); 441 } 442 splx(s); 443 /* FALLTHROUGH */ 444 445 case 0: /* exceptional */ 446 if ((tp->t_state&TS_ISOPEN) && 447 (pti->pt_flags&PF_PKT && pti->pt_send || 448 pti->pt_flags&PF_UCNTL && pti->pt_ucntl)) 449 return (1); 450 selrecord(p, &pti->pt_selr); 451 break; 452 453 454 case FWRITE: 455 if (tp->t_state&TS_ISOPEN) { 456 if (pti->pt_flags & PF_REMOTE) { 457 if (tp->t_canq.c_cc == 0) 458 return (1); 459 } else { 460 if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) 461 return (1); 462 if (tp->t_canq.c_cc == 0 && (tp->t_iflag&ICANON)) 463 return (1); 464 } 465 } 466 selrecord(p, &pti->pt_selw); 467 break; 468 469 } 470 return (0); 471 } 472 473 int 474 ptcwrite(dev, uio, flag) 475 dev_t dev; 476 register struct uio *uio; 477 int flag; 478 { 479 register struct tty *tp = pt_tty[minor(dev)]; 480 register u_char *cp; 481 register int cc = 0; 482 u_char locbuf[BUFSIZ]; 483 int cnt = 0; 484 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 485 int error = 0; 486 487 again: 488 if ((tp->t_state&TS_ISOPEN) == 0) 489 goto block; 490 if (pti->pt_flags & PF_REMOTE) { 491 if (tp->t_canq.c_cc) 492 goto block; 493 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 494 if (cc == 0) { 495 cc = min(uio->uio_resid, BUFSIZ); 496 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 497 cp = locbuf; 498 error = uiomove((caddr_t)cp, cc, uio); 499 if (error) 500 return (error); 501 /* check again for safety */ 502 if ((tp->t_state&TS_ISOPEN) == 0) 503 return (EIO); 504 } 505 if (cc) 506 (void) b_to_q(cp, cc, &tp->t_canq); 507 cc = 0; 508 } 509 (void) putc(0, &tp->t_canq); 510 ttwakeup(tp); 511 wakeup((caddr_t)&tp->t_canq); 512 return (0); 513 } 514 while (uio->uio_resid > 0) { 515 if (cc == 0) { 516 cc = min(uio->uio_resid, BUFSIZ); 517 cp = locbuf; 518 error = uiomove((caddr_t)cp, cc, uio); 519 if (error) 520 return (error); 521 /* check again for safety */ 522 if ((tp->t_state&TS_ISOPEN) == 0) 523 return (EIO); 524 } 525 while (cc > 0) { 526 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 527 (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 528 wakeup((caddr_t)&tp->t_rawq); 529 goto block; 530 } 531 (*linesw[tp->t_line].l_rint)(*cp++, tp); 532 cnt++; 533 cc--; 534 } 535 cc = 0; 536 } 537 return (0); 538 block: 539 /* 540 * Come here to wait for slave to open, for space 541 * in outq, or space in rawq. 542 */ 543 if ((tp->t_state&TS_CARR_ON) == 0) 544 return (EIO); 545 if (flag & IO_NDELAY) { 546 /* adjust for data copied in but not written */ 547 uio->uio_resid += cc; 548 if (cnt == 0) 549 return (EWOULDBLOCK); 550 return (0); 551 } 552 if (error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 553 ttyout, 0)) { 554 /* adjust for data copied in but not written */ 555 uio->uio_resid += cc; 556 return (error); 557 } 558 goto again; 559 } 560 561 /*ARGSUSED*/ 562 int 563 ptyioctl(dev, cmd, data, flag) 564 caddr_t data; 565 int cmd, flag; 566 dev_t dev; 567 { 568 register struct tty *tp = pt_tty[minor(dev)]; 569 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 570 register u_char *cc = tp->t_cc; 571 int stop, error; 572 573 /* 574 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 575 * ttywflush(tp) will hang if there are characters in the outq. 576 */ 577 if (cmd == TIOCEXT) { 578 /* 579 * When the EXTPROC bit is being toggled, we need 580 * to send an TIOCPKT_IOCTL if the packet driver 581 * is turned on. 582 */ 583 if (*(int *)data) { 584 if (pti->pt_flags & PF_PKT) { 585 pti->pt_send |= TIOCPKT_IOCTL; 586 ptcwakeup(tp, FREAD); 587 } 588 tp->t_lflag |= EXTPROC; 589 } else { 590 if ((tp->t_state & EXTPROC) && 591 (pti->pt_flags & PF_PKT)) { 592 pti->pt_send |= TIOCPKT_IOCTL; 593 ptcwakeup(tp, FREAD); 594 } 595 tp->t_lflag &= ~EXTPROC; 596 } 597 return(0); 598 } else 599 if (cdevsw[major(dev)].d_open == ptcopen) 600 switch (cmd) { 601 602 case TIOCGPGRP: 603 /* 604 * We aviod calling ttioctl on the controller since, 605 * in that case, tp must be the controlling terminal. 606 */ 607 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 608 return (0); 609 610 case TIOCPKT: 611 if (*(int *)data) { 612 if (pti->pt_flags & PF_UCNTL) 613 return (EINVAL); 614 pti->pt_flags |= PF_PKT; 615 } else 616 pti->pt_flags &= ~PF_PKT; 617 return (0); 618 619 case TIOCUCNTL: 620 if (*(int *)data) { 621 if (pti->pt_flags & PF_PKT) 622 return (EINVAL); 623 pti->pt_flags |= PF_UCNTL; 624 } else 625 pti->pt_flags &= ~PF_UCNTL; 626 return (0); 627 628 case TIOCREMOTE: 629 if (*(int *)data) 630 pti->pt_flags |= PF_REMOTE; 631 else 632 pti->pt_flags &= ~PF_REMOTE; 633 ttyflush(tp, FREAD|FWRITE); 634 return (0); 635 636 #ifdef COMPAT_43 637 /* wkt */ 638 case TIOCSETP: 639 case TIOCSETN: 640 #endif 641 case TIOCSETD: 642 case TIOCSETA: 643 case TIOCSETAW: 644 case TIOCSETAF: 645 flushq(&tp->t_outq); 646 break; 647 648 case TIOCSIG: 649 if (*(unsigned int *)data >= NSIG) 650 return(EINVAL); 651 if ((tp->t_lflag&NOFLSH) == 0) 652 ttyflush(tp, FREAD|FWRITE); 653 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 654 if ((*(unsigned int *)data == SIGINFO) && 655 ((tp->t_lflag&NOKERNINFO) == 0)) 656 ttyinfo(tp); 657 return(0); 658 } 659 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag); 660 if (error < 0) 661 error = ttioctl(tp, cmd, data, flag); 662 /* 663 * Since we use the tty queues internally, 664 * pty's can't be switched to disciplines which overwrite 665 * the queues. We can't tell anything about the discipline 666 * from here... 667 */ 668 if (linesw[tp->t_line].l_rint != ttyinput) { 669 (*linesw[tp->t_line].l_close)(tp, flag); 670 tp->t_line = TTYDISC; 671 (void)(*linesw[tp->t_line].l_open)(dev, tp); 672 error = ENOTTY; 673 } 674 if (error < 0) { 675 if (pti->pt_flags & PF_UCNTL && 676 (cmd & ~0xff) == UIOCCMD(0)) { 677 if (cmd & 0xff) { 678 pti->pt_ucntl = (u_char)cmd; 679 ptcwakeup(tp, FREAD); 680 } 681 return (0); 682 } 683 error = ENOTTY; 684 } 685 /* 686 * If external processing and packet mode send ioctl packet. 687 */ 688 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 689 switch(cmd) { 690 case TIOCSETA: 691 case TIOCSETAW: 692 case TIOCSETAF: 693 #ifdef COMPAT_43 694 /* wkt */ 695 case TIOCSETP: 696 case TIOCSETN: 697 case TIOCSETC: 698 case TIOCSLTC: 699 case TIOCLBIS: 700 case TIOCLBIC: 701 case TIOCLSET: 702 #endif 703 pti->pt_send |= TIOCPKT_IOCTL; 704 default: 705 break; 706 } 707 } 708 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 709 && CCEQ(cc[VSTART], CTRL('q')); 710 if (pti->pt_flags & PF_NOSTOP) { 711 if (stop) { 712 pti->pt_send &= ~TIOCPKT_NOSTOP; 713 pti->pt_send |= TIOCPKT_DOSTOP; 714 pti->pt_flags &= ~PF_NOSTOP; 715 ptcwakeup(tp, FREAD); 716 } 717 } else { 718 if (!stop) { 719 pti->pt_send &= ~TIOCPKT_DOSTOP; 720 pti->pt_send |= TIOCPKT_NOSTOP; 721 pti->pt_flags |= PF_NOSTOP; 722 ptcwakeup(tp, FREAD); 723 } 724 } 725 return (error); 726 } 727 #endif 728
Indexes created Mon Sep 22 05:09:51 GMT 2025