tty_pty.c revision 1.18
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 1.18 1994/02/09 21:06:49 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 int 300 ptcclose(dev) 301 dev_t dev; 302 { 303 register struct tty *tp; 304 305 tp = pt_tty[minor(dev)]; 306 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 307 tp->t_state &= ~TS_CARR_ON; 308 tp->t_oproc = 0; /* mark closed */ 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, p) 558 dev_t dev; 559 int cmd; 560 caddr_t data; 561 int flag; 562 struct proc *p; 563 { 564 register struct tty *tp = pt_tty[minor(dev)]; 565 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 566 register u_char *cc = tp->t_cc; 567 int stop, error; 568 569 /* 570 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 571 * ttywflush(tp) will hang if there are characters in the outq. 572 */ 573 if (cmd == TIOCEXT) { 574 /* 575 * When the EXTPROC bit is being toggled, we need 576 * to send an TIOCPKT_IOCTL if the packet driver 577 * is turned on. 578 */ 579 if (*(int *)data) { 580 if (pti->pt_flags & PF_PKT) { 581 pti->pt_send |= TIOCPKT_IOCTL; 582 ptcwakeup(tp, FREAD); 583 } 584 tp->t_lflag |= EXTPROC; 585 } else { 586 if ((tp->t_state & EXTPROC) && 587 (pti->pt_flags & PF_PKT)) { 588 pti->pt_send |= TIOCPKT_IOCTL; 589 ptcwakeup(tp, FREAD); 590 } 591 tp->t_lflag &= ~EXTPROC; 592 } 593 return(0); 594 } else 595 if (cdevsw[major(dev)].d_open == ptcopen) 596 switch (cmd) { 597 598 case TIOCGPGRP: 599 /* 600 * We aviod calling ttioctl on the controller since, 601 * in that case, tp must be the controlling terminal. 602 */ 603 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 604 return (0); 605 606 case TIOCPKT: 607 if (*(int *)data) { 608 if (pti->pt_flags & PF_UCNTL) 609 return (EINVAL); 610 pti->pt_flags |= PF_PKT; 611 } else 612 pti->pt_flags &= ~PF_PKT; 613 return (0); 614 615 case TIOCUCNTL: 616 if (*(int *)data) { 617 if (pti->pt_flags & PF_PKT) 618 return (EINVAL); 619 pti->pt_flags |= PF_UCNTL; 620 } else 621 pti->pt_flags &= ~PF_UCNTL; 622 return (0); 623 624 case TIOCREMOTE: 625 if (*(int *)data) 626 pti->pt_flags |= PF_REMOTE; 627 else 628 pti->pt_flags &= ~PF_REMOTE; 629 ttyflush(tp, FREAD|FWRITE); 630 return (0); 631 632 #ifdef COMPAT_43 633 /* wkt */ 634 case TIOCSETP: 635 case TIOCSETN: 636 #endif 637 case TIOCSETD: 638 case TIOCSETA: 639 case TIOCSETAW: 640 case TIOCSETAF: 641 flushq(&tp->t_outq); 642 break; 643 644 case TIOCSIG: 645 if (*(unsigned int *)data >= NSIG) 646 return(EINVAL); 647 if ((tp->t_lflag&NOFLSH) == 0) 648 ttyflush(tp, FREAD|FWRITE); 649 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 650 if ((*(unsigned int *)data == SIGINFO) && 651 ((tp->t_lflag&NOKERNINFO) == 0)) 652 ttyinfo(tp); 653 return(0); 654 } 655 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 656 if (error < 0) 657 error = ttioctl(tp, cmd, data, flag, p); 658 /* 659 * Since we use the tty queues internally, 660 * pty's can't be switched to disciplines which overwrite 661 * the queues. We can't tell anything about the discipline 662 * from here... 663 */ 664 if (linesw[tp->t_line].l_rint != ttyinput) { 665 (*linesw[tp->t_line].l_close)(tp, flag); 666 tp->t_line = TTYDISC; 667 (void)(*linesw[tp->t_line].l_open)(dev, tp); 668 error = ENOTTY; 669 } 670 if (error < 0) { 671 if (pti->pt_flags & PF_UCNTL && 672 (cmd & ~0xff) == UIOCCMD(0)) { 673 if (cmd & 0xff) { 674 pti->pt_ucntl = (u_char)cmd; 675 ptcwakeup(tp, FREAD); 676 } 677 return (0); 678 } 679 error = ENOTTY; 680 } 681 /* 682 * If external processing and packet mode send ioctl packet. 683 */ 684 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 685 switch(cmd) { 686 case TIOCSETA: 687 case TIOCSETAW: 688 case TIOCSETAF: 689 #ifdef COMPAT_43 690 /* wkt */ 691 case TIOCSETP: 692 case TIOCSETN: 693 case TIOCSETC: 694 case TIOCSLTC: 695 case TIOCLBIS: 696 case TIOCLBIC: 697 case TIOCLSET: 698 #endif 699 pti->pt_send |= TIOCPKT_IOCTL; 700 default: 701 break; 702 } 703 } 704 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 705 && CCEQ(cc[VSTART], CTRL('q')); 706 if (pti->pt_flags & PF_NOSTOP) { 707 if (stop) { 708 pti->pt_send &= ~TIOCPKT_NOSTOP; 709 pti->pt_send |= TIOCPKT_DOSTOP; 710 pti->pt_flags &= ~PF_NOSTOP; 711 ptcwakeup(tp, FREAD); 712 } 713 } else { 714 if (!stop) { 715 pti->pt_send &= ~TIOCPKT_DOSTOP; 716 pti->pt_send |= TIOCPKT_NOSTOP; 717 pti->pt_flags |= PF_NOSTOP; 718 ptcwakeup(tp, FREAD); 719 } 720 } 721 return (error); 722 } 723 #endif 724
Indexes created Tue Sep 23 14:10:03 GMT 2025