tty_pty.c revision 1.14
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 1.14 1993/11/12 15:15:57 cgd 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 "param.h" 45 #include "systm.h" 46 #include "ioctl.h" 47 #include "select.h" 48 #include "tty.h" 49 #include "conf.h" 50 #include "file.h" 51 #include "proc.h" 52 #include "uio.h" 53 #include "kernel.h" 54 #include "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 /*ARGSUSED*/ 87 int 88 ptsopen(dev, flag, devtype, p) 89 dev_t dev; 90 int flag, devtype; 91 struct proc *p; 92 { 93 register struct tty *tp; 94 int error; 95 96 #ifdef lint 97 npty = npty; 98 #endif 99 if (minor(dev) >= NPTY) 100 return (ENXIO); 101 if(!pt_tty[minor(dev)]) { 102 tp = pt_tty[minor(dev)] = ttymalloc(); 103 } else 104 tp = pt_tty[minor(dev)]; 105 if ((tp->t_state & TS_ISOPEN) == 0) { 106 tp->t_state |= TS_WOPEN; 107 ttychars(tp); /* Set up default chars */ 108 tp->t_iflag = TTYDEF_IFLAG; 109 tp->t_oflag = TTYDEF_OFLAG; 110 tp->t_lflag = TTYDEF_LFLAG; 111 tp->t_cflag = TTYDEF_CFLAG; 112 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 113 ttsetwater(tp); /* would be done in xxparam() */ 114 } else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0) 115 return (EBUSY); 116 if (tp->t_oproc) /* Ctrlr still around. */ 117 tp->t_state |= TS_CARR_ON; 118 while ((tp->t_state & TS_CARR_ON) == 0) { 119 tp->t_state |= TS_WOPEN; 120 if (flag&FNONBLOCK) 121 break; 122 if (error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH, 123 ttopen, 0)) 124 return (error); 125 } 126 if (error = (*linesw[tp->t_line].l_open)(dev, tp)) 127 return (error); 128 pt_ioctl[minor(dev)].pt_flags |= PF_SOPEN; 129 ptcwakeup(tp, FREAD|FWRITE); 130 return (0); 131 } 132 133 int 134 ptsclose(dev, flag, mode, p) 135 dev_t dev; 136 int flag, mode; 137 struct proc *p; 138 { 139 register struct tty *tp; 140 141 tp = pt_tty[minor(dev)]; 142 (*linesw[tp->t_line].l_close)(tp, flag); 143 ttyclose(tp); 144 ptcwakeup(tp, FREAD|FWRITE); 145 pt_ioctl[minor(dev)].pt_flags &= ~PF_SOPEN; 146 #ifdef broken /* session holds a ref to the tty; can't deallocate */ 147 if ((pt_ioctl[minor(dev)].pt_flags & PF_COPEN) == 0) { 148 ttyfree(tp); 149 pt_tty[minor(dev)] = (struct tty *)NULL; 150 } 151 #endif 152 return(0); 153 } 154 155 int 156 ptsread(dev, uio, flag) 157 dev_t dev; 158 struct uio *uio; 159 int flag; 160 { 161 struct proc *p = curproc; 162 register struct tty *tp = pt_tty[minor(dev)]; 163 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 164 int error = 0; 165 166 again: 167 if (pti->pt_flags & PF_REMOTE) { 168 while (isbackground(p, tp)) { 169 if ((p->p_sigignore & sigmask(SIGTTIN)) || 170 (p->p_sigmask & sigmask(SIGTTIN)) || 171 p->p_pgrp->pg_jobc == 0 || 172 p->p_flag&SPPWAIT) 173 return (EIO); 174 pgsignal(p->p_pgrp, SIGTTIN, 1); 175 if (error = ttysleep(tp, (caddr_t)&lbolt, 176 TTIPRI | PCATCH, ttybg, 0)) 177 return (error); 178 } 179 if (tp->t_canq.c_cc == 0) { 180 if (flag & IO_NDELAY) 181 return (EWOULDBLOCK); 182 if (error = ttysleep(tp, (caddr_t)&tp->t_canq, 183 TTIPRI | PCATCH, ttyin, 0)) 184 return (error); 185 goto again; 186 } 187 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 188 if (ureadc(getc(&tp->t_canq), uio) < 0) { 189 error = EFAULT; 190 break; 191 } 192 if (tp->t_canq.c_cc == 1) 193 (void) getc(&tp->t_canq); 194 if (tp->t_canq.c_cc) 195 return (error); 196 } else 197 if (tp->t_oproc) 198 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 199 ptcwakeup(tp, FWRITE); 200 return (error); 201 } 202 203 /* 204 * Write to pseudo-tty. 205 * Wakeups of controlling tty will happen 206 * indirectly, when tty driver calls ptsstart. 207 */ 208 int 209 ptswrite(dev, uio, flag) 210 dev_t dev; 211 struct uio *uio; 212 int flag; 213 { 214 register struct tty *tp; 215 216 tp = pt_tty[minor(dev)]; 217 if (tp->t_oproc == 0) 218 return (EIO); 219 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 220 } 221 222 /* 223 * Start output on pseudo-tty. 224 * Wake up process selecting or sleeping for input from controlling tty. 225 */ 226 void 227 ptsstart(tp) 228 struct tty *tp; 229 { 230 register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 231 232 if (tp->t_state & TS_TTSTOP) 233 return; 234 if (pti->pt_flags & PF_STOPPED) { 235 pti->pt_flags &= ~PF_STOPPED; 236 pti->pt_send = TIOCPKT_START; 237 } 238 ptcwakeup(tp, FREAD); 239 return; 240 } 241 242 void 243 ptcwakeup(tp, flag) 244 struct tty *tp; 245 int flag; 246 { 247 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 248 249 if (flag & FREAD) { 250 selwakeup(&pti->pt_selr); 251 wakeup((caddr_t)&tp->t_outq.c_cl); 252 } 253 if (flag & FWRITE) { 254 selwakeup(&pti->pt_selw); 255 wakeup((caddr_t)&tp->t_rawq.c_cf); 256 } 257 } 258 259 /*ARGSUSED*/ 260 #ifdef __STDC__ 261 int 262 ptcopen(dev_t dev, int flag, int devtype, struct proc *p) 263 #else 264 int 265 ptcopen(dev, flag, devtype, p) 266 dev_t dev; 267 int flag, devtype; 268 struct proc *p; 269 #endif 270 { 271 register struct tty *tp; 272 struct pt_ioctl *pti; 273 274 if (minor(dev) >= NPTY) 275 return (ENXIO); 276 if(!pt_tty[minor(dev)]) { 277 tp = pt_tty[minor(dev)] = ttymalloc(); 278 } else 279 tp = pt_tty[minor(dev)]; 280 if (tp->t_oproc) 281 return (EIO); 282 tp->t_oproc = ptsstart; 283 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 284 tp->t_lflag &= ~EXTPROC; 285 pti = &pt_ioctl[minor(dev)]; 286 pti->pt_flags &= PF_SOPEN; 287 pti->pt_flags |= PF_COPEN; 288 pti->pt_send = 0; 289 pti->pt_ucntl = 0; 290 return (0); 291 } 292 293 extern struct tty *constty; /* -hv- 06.Oct.92*/ 294 295 int 296 ptcclose(dev) 297 dev_t dev; 298 { 299 register struct tty *tp; 300 301 tp = pt_tty[minor(dev)]; 302 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 303 tp->t_state &= ~TS_CARR_ON; 304 tp->t_oproc = 0; /* mark closed */ 305 306 /* XXX -hv- 6.Oct.92 this prevents the "hanging console bug" with X11 */ 307 if (constty==tp) 308 constty = 0; 309 310 pt_ioctl[minor(dev)].pt_flags &= ~PF_COPEN; 311 #ifdef broken 312 if ((pt_ioctl[minor(dev)].pt_flags & PF_SOPEN) == 0) { 313 ttyfree(tp); 314 pt_tty[minor(dev)] = (struct tty *)NULL; 315 } 316 #endif 317 return (0); 318 } 319 320 int 321 ptcread(dev, uio, flag) 322 dev_t dev; 323 struct uio *uio; 324 int flag; 325 { 326 register struct tty *tp = pt_tty[minor(dev)]; 327 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 328 u_char buf[BUFSIZ]; 329 int error = 0, cc; 330 331 /* 332 * We want to block until the slave 333 * is open, and there's something to read; 334 * but if we lost the slave or we're NBIO, 335 * then return the appropriate error instead. 336 */ 337 for (;;) { 338 if (tp->t_state&TS_ISOPEN) { 339 if (pti->pt_flags&PF_PKT && pti->pt_send) { 340 error = ureadc((int)pti->pt_send, uio); 341 if (error) 342 return (error); 343 if (pti->pt_send & TIOCPKT_IOCTL) { 344 cc = MIN(uio->uio_resid, 345 sizeof(tp->t_termios)); 346 uiomove((caddr_t)&tp->t_termios, cc, 347 uio); 348 } 349 pti->pt_send = 0; 350 return (0); 351 } 352 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 353 error = ureadc((int)pti->pt_ucntl, uio); 354 if (error) 355 return (error); 356 pti->pt_ucntl = 0; 357 return (0); 358 } 359 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 360 break; 361 } 362 if ((tp->t_state&TS_CARR_ON) == 0) 363 return (0); /* EOF */ 364 if (flag & IO_NDELAY) 365 return (EWOULDBLOCK); 366 if (error = tsleep((caddr_t)&tp->t_outq.c_cl, TTIPRI | PCATCH, 367 ttyin, 0)) 368 return (error); 369 } 370 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 371 error = ureadc(0, uio); 372 while (uio->uio_resid > 0 && error == 0) { 373 cc = q_to_b(&tp->t_outq, buf, MIN(uio->uio_resid, BUFSIZ)); 374 if (cc <= 0) 375 break; 376 error = uiomove(buf, cc, uio); 377 } 378 if (tp->t_outq.c_cc <= tp->t_lowat) { 379 if (tp->t_state&TS_ASLEEP) { 380 tp->t_state &= ~TS_ASLEEP; 381 wakeup((caddr_t)&tp->t_outq); 382 } 383 selwakeup(&tp->t_wsel); 384 } 385 return (error); 386 } 387 388 void 389 ptsstop(tp, flush) 390 register struct tty *tp; 391 int flush; 392 { 393 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 394 int flag; 395 396 /* note: FLUSHREAD and FLUSHWRITE already ok */ 397 if (flush == 0) { 398 flush = TIOCPKT_STOP; 399 pti->pt_flags |= PF_STOPPED; 400 } else 401 pti->pt_flags &= ~PF_STOPPED; 402 pti->pt_send |= flush; 403 /* change of perspective */ 404 flag = 0; 405 if (flush & FREAD) 406 flag |= FWRITE; 407 if (flush & FWRITE) 408 flag |= FREAD; 409 ptcwakeup(tp, flag); 410 } 411 412 int 413 ptcselect(dev, rw, p) 414 dev_t dev; 415 int rw; 416 struct proc *p; 417 { 418 register struct tty *tp = pt_tty[minor(dev)]; 419 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 420 int s; 421 422 if ((tp->t_state&TS_CARR_ON) == 0) 423 return (1); 424 switch (rw) { 425 426 case FREAD: 427 /* 428 * Need to block timeouts (ttrstart). 429 */ 430 s = spltty(); 431 if ((tp->t_state&TS_ISOPEN) && 432 tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) { 433 splx(s); 434 return (1); 435 } 436 splx(s); 437 /* FALLTHROUGH */ 438 439 case 0: /* exceptional */ 440 if ((tp->t_state&TS_ISOPEN) && 441 (pti->pt_flags&PF_PKT && pti->pt_send || 442 pti->pt_flags&PF_UCNTL && pti->pt_ucntl)) 443 return (1); 444 selrecord(p, &pti->pt_selr); 445 break; 446 447 448 case FWRITE: 449 if (tp->t_state&TS_ISOPEN) { 450 if (pti->pt_flags & PF_REMOTE) { 451 if (tp->t_canq.c_cc == 0) 452 return (1); 453 } else { 454 if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) 455 return (1); 456 if (tp->t_canq.c_cc == 0 && (tp->t_iflag&ICANON)) 457 return (1); 458 } 459 } 460 selrecord(p, &pti->pt_selw); 461 break; 462 463 } 464 return (0); 465 } 466 467 int 468 ptcwrite(dev, uio, flag) 469 dev_t dev; 470 register struct uio *uio; 471 int flag; 472 { 473 register struct tty *tp = pt_tty[minor(dev)]; 474 register u_char *cp; 475 register int cc = 0; 476 u_char locbuf[BUFSIZ]; 477 int cnt = 0; 478 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 479 int error = 0; 480 481 again: 482 if ((tp->t_state&TS_ISOPEN) == 0) 483 goto block; 484 if (pti->pt_flags & PF_REMOTE) { 485 if (tp->t_canq.c_cc) 486 goto block; 487 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 488 if (cc == 0) { 489 cc = min(uio->uio_resid, BUFSIZ); 490 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 491 cp = locbuf; 492 error = uiomove((caddr_t)cp, cc, uio); 493 if (error) 494 return (error); 495 /* check again for safety */ 496 if ((tp->t_state&TS_ISOPEN) == 0) 497 return (EIO); 498 } 499 if (cc) 500 (void) b_to_q(cp, cc, &tp->t_canq); 501 cc = 0; 502 } 503 (void) putc(0, &tp->t_canq); 504 ttwakeup(tp); 505 wakeup((caddr_t)&tp->t_canq); 506 return (0); 507 } 508 while (uio->uio_resid > 0) { 509 if (cc == 0) { 510 cc = min(uio->uio_resid, BUFSIZ); 511 cp = locbuf; 512 error = uiomove((caddr_t)cp, cc, uio); 513 if (error) 514 return (error); 515 /* check again for safety */ 516 if ((tp->t_state&TS_ISOPEN) == 0) 517 return (EIO); 518 } 519 while (cc > 0) { 520 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 521 (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 522 wakeup((caddr_t)&tp->t_rawq); 523 goto block; 524 } 525 (*linesw[tp->t_line].l_rint)(*cp++, tp); 526 cnt++; 527 cc--; 528 } 529 cc = 0; 530 } 531 return (0); 532 block: 533 /* 534 * Come here to wait for slave to open, for space 535 * in outq, or space in rawq. 536 */ 537 if ((tp->t_state&TS_CARR_ON) == 0) 538 return (EIO); 539 if (flag & IO_NDELAY) { 540 /* adjust for data copied in but not written */ 541 uio->uio_resid += cc; 542 if (cnt == 0) 543 return (EWOULDBLOCK); 544 return (0); 545 } 546 if (error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 547 ttyout, 0)) { 548 /* adjust for data copied in but not written */ 549 uio->uio_resid += cc; 550 return (error); 551 } 552 goto again; 553 } 554 555 /*ARGSUSED*/ 556 int 557 ptyioctl(dev, cmd, data, flag) 558 caddr_t data; 559 int cmd, flag; 560 dev_t dev; 561 { 562 register struct tty *tp = pt_tty[minor(dev)]; 563 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 564 register u_char *cc = tp->t_cc; 565 int stop, error; 566 567 /* 568 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 569 * ttywflush(tp) will hang if there are characters in the outq. 570 */ 571 if (cmd == TIOCEXT) { 572 /* 573 * When the EXTPROC bit is being toggled, we need 574 * to send an TIOCPKT_IOCTL if the packet driver 575 * is turned on. 576 */ 577 if (*(int *)data) { 578 if (pti->pt_flags & PF_PKT) { 579 pti->pt_send |= TIOCPKT_IOCTL; 580 ptcwakeup(tp, FREAD); 581 } 582 tp->t_lflag |= EXTPROC; 583 } else { 584 if ((tp->t_state & EXTPROC) && 585 (pti->pt_flags & PF_PKT)) { 586 pti->pt_send |= TIOCPKT_IOCTL; 587 ptcwakeup(tp, FREAD); 588 } 589 tp->t_lflag &= ~EXTPROC; 590 } 591 return(0); 592 } else 593 if (cdevsw[major(dev)].d_open == ptcopen) 594 switch (cmd) { 595 596 case TIOCGPGRP: 597 /* 598 * We aviod calling ttioctl on the controller since, 599 * in that case, tp must be the controlling terminal. 600 */ 601 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 602 return (0); 603 604 case TIOCPKT: 605 if (*(int *)data) { 606 if (pti->pt_flags & PF_UCNTL) 607 return (EINVAL); 608 pti->pt_flags |= PF_PKT; 609 } else 610 pti->pt_flags &= ~PF_PKT; 611 return (0); 612 613 case TIOCUCNTL: 614 if (*(int *)data) { 615 if (pti->pt_flags & PF_PKT) 616 return (EINVAL); 617 pti->pt_flags |= PF_UCNTL; 618 } else 619 pti->pt_flags &= ~PF_UCNTL; 620 return (0); 621 622 case TIOCREMOTE: 623 if (*(int *)data) 624 pti->pt_flags |= PF_REMOTE; 625 else 626 pti->pt_flags &= ~PF_REMOTE; 627 ttyflush(tp, FREAD|FWRITE); 628 return (0); 629 630 #ifdef COMPAT_43 631 /* wkt */ 632 case TIOCSETP: 633 case TIOCSETN: 634 #endif 635 case TIOCSETD: 636 case TIOCSETA: 637 case TIOCSETAW: 638 case TIOCSETAF: 639 flushq(&tp->t_outq); 640 break; 641 642 case TIOCSIG: 643 if (*(unsigned int *)data >= NSIG) 644 return(EINVAL); 645 if ((tp->t_lflag&NOFLSH) == 0) 646 ttyflush(tp, FREAD|FWRITE); 647 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 648 if ((*(unsigned int *)data == SIGINFO) && 649 ((tp->t_lflag&NOKERNINFO) == 0)) 650 ttyinfo(tp); 651 return(0); 652 } 653 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag); 654 if (error < 0) 655 error = ttioctl(tp, cmd, data, flag); 656 /* 657 * Since we use the tty queues internally, 658 * pty's can't be switched to disciplines which overwrite 659 * the queues. We can't tell anything about the discipline 660 * from here... 661 */ 662 if (linesw[tp->t_line].l_rint != ttyinput) { 663 (*linesw[tp->t_line].l_close)(tp, flag); 664 tp->t_line = TTYDISC; 665 (void)(*linesw[tp->t_line].l_open)(dev, tp); 666 error = ENOTTY; 667 } 668 if (error < 0) { 669 if (pti->pt_flags & PF_UCNTL && 670 (cmd & ~0xff) == UIOCCMD(0)) { 671 if (cmd & 0xff) { 672 pti->pt_ucntl = (u_char)cmd; 673 ptcwakeup(tp, FREAD); 674 } 675 return (0); 676 } 677 error = ENOTTY; 678 } 679 /* 680 * If external processing and packet mode send ioctl packet. 681 */ 682 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 683 switch(cmd) { 684 case TIOCSETA: 685 case TIOCSETAW: 686 case TIOCSETAF: 687 #ifdef COMPAT_43 688 /* wkt */ 689 case TIOCSETP: 690 case TIOCSETN: 691 case TIOCSETC: 692 case TIOCSLTC: 693 case TIOCLBIS: 694 case TIOCLBIC: 695 case TIOCLSET: 696 #endif 697 pti->pt_send |= TIOCPKT_IOCTL; 698 default: 699 break; 700 } 701 } 702 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 703 && CCEQ(cc[VSTART], CTRL('q')); 704 if (pti->pt_flags & PF_NOSTOP) { 705 if (stop) { 706 pti->pt_send &= ~TIOCPKT_NOSTOP; 707 pti->pt_send |= TIOCPKT_DOSTOP; 708 pti->pt_flags &= ~PF_NOSTOP; 709 ptcwakeup(tp, FREAD); 710 } 711 } else { 712 if (!stop) { 713 pti->pt_send &= ~TIOCPKT_DOSTOP; 714 pti->pt_send |= TIOCPKT_NOSTOP; 715 pti->pt_flags |= PF_NOSTOP; 716 ptcwakeup(tp, FREAD); 717 } 718 } 719 return (error); 720 } 721 #endif 722
Indexes created Tue Sep 30 20:09:53 GMT 2025