tty_pty.c revision 1.12.2.7
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 1.12.2.7 1993/11/14 21:33:04 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 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/ioctl.h> 46 #include <sys/select.h> 47 #include <sys/tty.h> 48 #include <sys/conf.h> 49 #include <sys/file.h> 50 #include <sys/proc.h> 51 #include <sys/uio.h> 52 #include <sys/kernel.h> 53 #include <sys/vnode.h> 54 55 #include <machine/cpu.h> 56 57 #if NPTY == 1 58 #undef NPTY 59 #define NPTY 32 /* crude XXX */ 60 #endif 61 62 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 63 64 /* 65 * pts == /dev/tty[pqrs]? 66 * ptc == /dev/pty[pqrs]? 67 */ 68 struct tty *pt_tty[NPTY]; 69 struct pt_ioctl { 70 int pt_flags; 71 struct selinfo pt_selr, pt_selw; 72 u_char pt_send; 73 u_char pt_ucntl; 74 } pt_ioctl[NPTY]; 75 int npty = NPTY; /* for pstat -t */ 76 77 #define PF_COPEN 0x01 /* master open */ 78 #define PF_SOPEN 0x02 /* slave open */ 79 #define PF_PKT 0x08 /* packet mode */ 80 #define PF_STOPPED 0x10 /* user told stopped */ 81 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 82 #define PF_NOSTOP 0x40 83 #define PF_UCNTL 0x80 /* user control mode */ 84 85 void ptcwakeup __P((struct tty *tp, int flag)); 86 87 void 88 ptyattach(n) 89 int n; 90 { 91 } 92 93 /*ARGSUSED*/ 94 int 95 ptsopen(dev, flag, devtype, p) 96 dev_t dev; 97 int flag, devtype; 98 struct proc *p; 99 { 100 register struct tty *tp; 101 int error; 102 103 #ifdef lint 104 npty = npty; 105 #endif 106 if (minor(dev) >= NPTY) 107 return (ENXIO); 108 if(!pt_tty[minor(dev)]) { 109 tp = pt_tty[minor(dev)] = ttymalloc(); 110 } else 111 tp = pt_tty[minor(dev)]; 112 if ((tp->t_state & TS_ISOPEN) == 0) { 113 tp->t_state |= TS_WOPEN; 114 ttychars(tp); /* Set up default chars */ 115 tp->t_iflag = TTYDEF_IFLAG; 116 tp->t_oflag = TTYDEF_OFLAG; 117 tp->t_lflag = TTYDEF_LFLAG; 118 tp->t_cflag = TTYDEF_CFLAG; 119 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 120 ttsetwater(tp); /* would be done in xxparam() */ 121 } else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0) 122 return (EBUSY); 123 if (tp->t_oproc) /* Ctrlr still around. */ 124 tp->t_state |= TS_CARR_ON; 125 while ((tp->t_state & TS_CARR_ON) == 0) { 126 tp->t_state |= TS_WOPEN; 127 if (flag&FNONBLOCK) 128 break; 129 if (error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH, 130 ttopen, 0)) 131 return (error); 132 } 133 if (error = (*linesw[tp->t_line].l_open)(dev, tp)) 134 return (error); 135 pt_ioctl[minor(dev)].pt_flags |= PF_SOPEN; 136 ptcwakeup(tp, FREAD|FWRITE); 137 return (0); 138 } 139 140 int 141 ptsclose(dev, flag, mode, p) 142 dev_t dev; 143 int flag, mode; 144 struct proc *p; 145 { 146 register struct tty *tp; 147 148 tp = pt_tty[minor(dev)]; 149 (*linesw[tp->t_line].l_close)(tp, flag); 150 ttyclose(tp); 151 ptcwakeup(tp, FREAD|FWRITE); 152 pt_ioctl[minor(dev)].pt_flags &= ~PF_SOPEN; 153 #ifdef notyet /* XXXX */ 154 if ((pt_ioctl[minor(dev)].pt_flags & PF_COPEN) == 0) { 155 ttyfree(tp); 156 pt_tty[minor(dev)] = (struct tty *)NULL; 157 } 158 #endif 159 return(0); 160 } 161 162 int 163 ptsread(dev, uio, flag) 164 dev_t dev; 165 struct uio *uio; 166 int flag; 167 { 168 struct proc *p = curproc; 169 register struct tty *tp = pt_tty[minor(dev)]; 170 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 171 int error = 0; 172 173 again: 174 if (pti->pt_flags & PF_REMOTE) { 175 while (isbackground(p, tp)) { 176 if ((p->p_sigignore & sigmask(SIGTTIN)) || 177 (p->p_sigmask & sigmask(SIGTTIN)) || 178 p->p_pgrp->pg_jobc == 0 || 179 p->p_flag&SPPWAIT) 180 return (EIO); 181 pgsignal(p->p_pgrp, SIGTTIN, 1); 182 if (error = ttysleep(tp, (caddr_t)&lbolt, 183 TTIPRI | PCATCH, ttybg, 0)) 184 return (error); 185 } 186 if (tp->t_canq.c_cc == 0) { 187 if (flag & IO_NDELAY) 188 return (EWOULDBLOCK); 189 if (error = ttysleep(tp, (caddr_t)&tp->t_canq, 190 TTIPRI | PCATCH, ttyin, 0)) 191 return (error); 192 goto again; 193 } 194 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 195 if (ureadc(getc(&tp->t_canq), uio) < 0) { 196 error = EFAULT; 197 break; 198 } 199 if (tp->t_canq.c_cc == 1) 200 (void) getc(&tp->t_canq); 201 if (tp->t_canq.c_cc) 202 return (error); 203 } else 204 if (tp->t_oproc) 205 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 206 ptcwakeup(tp, FWRITE); 207 return (error); 208 } 209 210 /* 211 * Write to pseudo-tty. 212 * Wakeups of controlling tty will happen 213 * indirectly, when tty driver calls ptsstart. 214 */ 215 int 216 ptswrite(dev, uio, flag) 217 dev_t dev; 218 struct uio *uio; 219 int flag; 220 { 221 register struct tty *tp; 222 223 tp = pt_tty[minor(dev)]; 224 if (tp->t_oproc == 0) 225 return (EIO); 226 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 227 } 228 229 /* 230 * Start output on pseudo-tty. 231 * Wake up process selecting or sleeping for input from controlling tty. 232 */ 233 void 234 ptsstart(tp) 235 struct tty *tp; 236 { 237 register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 238 239 if (tp->t_state & TS_TTSTOP) 240 return; 241 if (pti->pt_flags & PF_STOPPED) { 242 pti->pt_flags &= ~PF_STOPPED; 243 pti->pt_send = TIOCPKT_START; 244 } 245 ptcwakeup(tp, FREAD); 246 return; 247 } 248 249 void 250 ptcwakeup(tp, flag) 251 struct tty *tp; 252 int flag; 253 { 254 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 255 256 if (flag & FREAD) { 257 selwakeup(&pti->pt_selr); 258 wakeup((caddr_t)&tp->t_outq.c_cl); 259 } 260 if (flag & FWRITE) { 261 selwakeup(&pti->pt_selw); 262 wakeup((caddr_t)&tp->t_rawq.c_cf); 263 } 264 } 265 266 /*ARGSUSED*/ 267 #ifdef __STDC__ 268 int 269 ptcopen(dev_t dev, int flag, int devtype, struct proc *p) 270 #else 271 int 272 ptcopen(dev, flag, devtype, p) 273 dev_t dev; 274 int flag, devtype; 275 struct proc *p; 276 #endif 277 { 278 register struct tty *tp; 279 struct pt_ioctl *pti; 280 281 if (minor(dev) >= NPTY) 282 return (ENXIO); 283 if(!pt_tty[minor(dev)]) { 284 tp = pt_tty[minor(dev)] = ttymalloc(); 285 } else 286 tp = pt_tty[minor(dev)]; 287 if (tp->t_oproc) 288 return (EIO); 289 tp->t_oproc = ptsstart; 290 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 291 tp->t_lflag &= ~EXTPROC; 292 pti = &pt_ioctl[minor(dev)]; 293 pti->pt_flags &= PF_SOPEN; 294 pti->pt_flags |= PF_COPEN; 295 pti->pt_send = 0; 296 pti->pt_ucntl = 0; 297 return (0); 298 } 299 300 extern struct tty *constty; /* -hv- 06.Oct.92*/ 301 302 int 303 ptcclose(dev) 304 dev_t dev; 305 { 306 register struct tty *tp; 307 308 tp = pt_tty[minor(dev)]; 309 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 310 tp->t_state &= ~TS_CARR_ON; 311 tp->t_oproc = 0; /* mark closed */ 312 313 /* XXX -hv- 6.Oct.92 this prevents the "hanging console bug" with X11 */ 314 if (constty==tp) 315 constty = 0; 316 317 pt_ioctl[minor(dev)].pt_flags &= ~PF_COPEN; 318 if ((pt_ioctl[minor(dev)].pt_flags & PF_SOPEN) == 0) { 319 ttyfree(tp); 320 pt_tty[minor(dev)] = (struct tty *)NULL; 321 } 322 return (0); 323 } 324 325 int 326 ptcread(dev, uio, flag) 327 dev_t dev; 328 struct uio *uio; 329 int flag; 330 { 331 register struct tty *tp = pt_tty[minor(dev)]; 332 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 333 u_char buf[BUFSIZ]; 334 int error = 0, cc; 335 336 /* 337 * We want to block until the slave 338 * is open, and there's something to read; 339 * but if we lost the slave or we're NBIO, 340 * then return the appropriate error instead. 341 */ 342 for (;;) { 343 if (tp->t_state&TS_ISOPEN) { 344 if (pti->pt_flags&PF_PKT && pti->pt_send) { 345 error = ureadc((int)pti->pt_send, uio); 346 if (error) 347 return (error); 348 if (pti->pt_send & TIOCPKT_IOCTL) { 349 cc = MIN(uio->uio_resid, 350 sizeof(tp->t_termios)); 351 uiomove((caddr_t)&tp->t_termios, cc, 352 uio); 353 } 354 pti->pt_send = 0; 355 return (0); 356 } 357 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 358 error = ureadc((int)pti->pt_ucntl, uio); 359 if (error) 360 return (error); 361 pti->pt_ucntl = 0; 362 return (0); 363 } 364 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 365 break; 366 } 367 if ((tp->t_state&TS_CARR_ON) == 0) 368 return (0); /* EOF */ 369 if (flag & IO_NDELAY) 370 return (EWOULDBLOCK); 371 if (error = tsleep((caddr_t)&tp->t_outq.c_cl, TTIPRI | PCATCH, 372 ttyin, 0)) 373 return (error); 374 } 375 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 376 error = ureadc(0, uio); 377 while (uio->uio_resid > 0 && error == 0) { 378 cc = q_to_b(&tp->t_outq, buf, MIN(uio->uio_resid, BUFSIZ)); 379 if (cc <= 0) 380 break; 381 error = uiomove(buf, cc, uio); 382 } 383 if (tp->t_outq.c_cc <= tp->t_lowat) { 384 if (tp->t_state&TS_ASLEEP) { 385 tp->t_state &= ~TS_ASLEEP; 386 wakeup((caddr_t)&tp->t_outq); 387 } 388 selwakeup(&tp->t_wsel); 389 } 390 return (error); 391 } 392 393 void 394 ptsstop(tp, flush) 395 register struct tty *tp; 396 int flush; 397 { 398 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 399 int flag; 400 401 /* note: FLUSHREAD and FLUSHWRITE already ok */ 402 if (flush == 0) { 403 flush = TIOCPKT_STOP; 404 pti->pt_flags |= PF_STOPPED; 405 } else 406 pti->pt_flags &= ~PF_STOPPED; 407 pti->pt_send |= flush; 408 /* change of perspective */ 409 flag = 0; 410 if (flush & FREAD) 411 flag |= FWRITE; 412 if (flush & FWRITE) 413 flag |= FREAD; 414 ptcwakeup(tp, flag); 415 } 416 417 int 418 ptcselect(dev, rw, p) 419 dev_t dev; 420 int rw; 421 struct proc *p; 422 { 423 register struct tty *tp = pt_tty[minor(dev)]; 424 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 425 int s; 426 427 if ((tp->t_state&TS_CARR_ON) == 0) 428 return (1); 429 switch (rw) { 430 431 case FREAD: 432 /* 433 * Need to block timeouts (ttrstart). 434 */ 435 s = spltty(); 436 if ((tp->t_state&TS_ISOPEN) && 437 tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) { 438 splx(s); 439 return (1); 440 } 441 splx(s); 442 /* FALLTHROUGH */ 443 444 case 0: /* exceptional */ 445 if ((tp->t_state&TS_ISOPEN) && 446 (pti->pt_flags&PF_PKT && pti->pt_send || 447 pti->pt_flags&PF_UCNTL && pti->pt_ucntl)) 448 return (1); 449 selrecord(p, &pti->pt_selr); 450 break; 451 452 453 case FWRITE: 454 if (tp->t_state&TS_ISOPEN) { 455 if (pti->pt_flags & PF_REMOTE) { 456 if (tp->t_canq.c_cc == 0) 457 return (1); 458 } else { 459 if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) 460 return (1); 461 if (tp->t_canq.c_cc == 0 && (tp->t_iflag&ICANON)) 462 return (1); 463 } 464 } 465 selrecord(p, &pti->pt_selw); 466 break; 467 468 } 469 return (0); 470 } 471 472 int 473 ptcwrite(dev, uio, flag) 474 dev_t dev; 475 register struct uio *uio; 476 int flag; 477 { 478 register struct tty *tp = pt_tty[minor(dev)]; 479 register u_char *cp; 480 register int cc = 0; 481 u_char locbuf[BUFSIZ]; 482 int cnt = 0; 483 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 484 int error = 0; 485 486 again: 487 if ((tp->t_state&TS_ISOPEN) == 0) 488 goto block; 489 if (pti->pt_flags & PF_REMOTE) { 490 if (tp->t_canq.c_cc) 491 goto block; 492 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 493 if (cc == 0) { 494 cc = min(uio->uio_resid, BUFSIZ); 495 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 496 cp = locbuf; 497 error = uiomove((caddr_t)cp, cc, uio); 498 if (error) 499 return (error); 500 /* check again for safety */ 501 if ((tp->t_state&TS_ISOPEN) == 0) 502 return (EIO); 503 } 504 if (cc) 505 (void) b_to_q(cp, cc, &tp->t_canq); 506 cc = 0; 507 } 508 (void) putc(0, &tp->t_canq); 509 ttwakeup(tp); 510 wakeup((caddr_t)&tp->t_canq); 511 return (0); 512 } 513 while (uio->uio_resid > 0) { 514 if (cc == 0) { 515 cc = min(uio->uio_resid, BUFSIZ); 516 cp = locbuf; 517 error = uiomove((caddr_t)cp, cc, uio); 518 if (error) 519 return (error); 520 /* check again for safety */ 521 if ((tp->t_state&TS_ISOPEN) == 0) 522 return (EIO); 523 } 524 while (cc > 0) { 525 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 526 (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 527 wakeup((caddr_t)&tp->t_rawq); 528 goto block; 529 } 530 (*linesw[tp->t_line].l_rint)(*cp++, tp); 531 cnt++; 532 cc--; 533 } 534 cc = 0; 535 } 536 return (0); 537 block: 538 /* 539 * Come here to wait for slave to open, for space 540 * in outq, or space in rawq. 541 */ 542 if ((tp->t_state&TS_CARR_ON) == 0) 543 return (EIO); 544 if (flag & IO_NDELAY) { 545 /* adjust for data copied in but not written */ 546 uio->uio_resid += cc; 547 if (cnt == 0) 548 return (EWOULDBLOCK); 549 return (0); 550 } 551 if (error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 552 ttyout, 0)) { 553 /* adjust for data copied in but not written */ 554 uio->uio_resid += cc; 555 return (error); 556 } 557 goto again; 558 } 559 560 /*ARGSUSED*/ 561 int 562 ptyioctl(dev, cmd, data, flag) 563 caddr_t data; 564 int cmd, flag; 565 dev_t dev; 566 { 567 register struct tty *tp = pt_tty[minor(dev)]; 568 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 569 register u_char *cc = tp->t_cc; 570 int stop, error; 571 572 /* 573 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 574 * ttywflush(tp) will hang if there are characters in the outq. 575 */ 576 if (cmd == TIOCEXT) { 577 /* 578 * When the EXTPROC bit is being toggled, we need 579 * to send an TIOCPKT_IOCTL if the packet driver 580 * is turned on. 581 */ 582 if (*(int *)data) { 583 if (pti->pt_flags & PF_PKT) { 584 pti->pt_send |= TIOCPKT_IOCTL; 585 ptcwakeup(tp, FREAD); 586 } 587 tp->t_lflag |= EXTPROC; 588 } else { 589 if ((tp->t_state & EXTPROC) && 590 (pti->pt_flags & PF_PKT)) { 591 pti->pt_send |= TIOCPKT_IOCTL; 592 ptcwakeup(tp, FREAD); 593 } 594 tp->t_lflag &= ~EXTPROC; 595 } 596 return(0); 597 } else 598 if (cdevsw[major(dev)].d_open == ptcopen) 599 switch (cmd) { 600 601 case TIOCGPGRP: 602 /* 603 * We aviod calling ttioctl on the controller since, 604 * in that case, tp must be the controlling terminal. 605 */ 606 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 607 return (0); 608 609 case TIOCPKT: 610 if (*(int *)data) { 611 if (pti->pt_flags & PF_UCNTL) 612 return (EINVAL); 613 pti->pt_flags |= PF_PKT; 614 } else 615 pti->pt_flags &= ~PF_PKT; 616 return (0); 617 618 case TIOCUCNTL: 619 if (*(int *)data) { 620 if (pti->pt_flags & PF_PKT) 621 return (EINVAL); 622 pti->pt_flags |= PF_UCNTL; 623 } else 624 pti->pt_flags &= ~PF_UCNTL; 625 return (0); 626 627 case TIOCREMOTE: 628 if (*(int *)data) 629 pti->pt_flags |= PF_REMOTE; 630 else 631 pti->pt_flags &= ~PF_REMOTE; 632 ttyflush(tp, FREAD|FWRITE); 633 return (0); 634 635 #ifdef COMPAT_43 636 /* wkt */ 637 case TIOCSETP: 638 case TIOCSETN: 639 #endif 640 case TIOCSETD: 641 case TIOCSETA: 642 case TIOCSETAW: 643 case TIOCSETAF: 644 flushq(&tp->t_outq); 645 break; 646 647 case TIOCSIG: 648 if (*(unsigned int *)data >= NSIG) 649 return(EINVAL); 650 if ((tp->t_lflag&NOFLSH) == 0) 651 ttyflush(tp, FREAD|FWRITE); 652 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 653 if ((*(unsigned int *)data == SIGINFO) && 654 ((tp->t_lflag&NOKERNINFO) == 0)) 655 ttyinfo(tp); 656 return(0); 657 } 658 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag); 659 if (error < 0) 660 error = ttioctl(tp, cmd, data, flag); 661 /* 662 * Since we use the tty queues internally, 663 * pty's can't be switched to disciplines which overwrite 664 * the queues. We can't tell anything about the discipline 665 * from here... 666 */ 667 if (linesw[tp->t_line].l_rint != ttyinput) { 668 (*linesw[tp->t_line].l_close)(tp, flag); 669 tp->t_line = TTYDISC; 670 (void)(*linesw[tp->t_line].l_open)(dev, tp); 671 error = ENOTTY; 672 } 673 if (error < 0) { 674 if (pti->pt_flags & PF_UCNTL && 675 (cmd & ~0xff) == UIOCCMD(0)) { 676 if (cmd & 0xff) { 677 pti->pt_ucntl = (u_char)cmd; 678 ptcwakeup(tp, FREAD); 679 } 680 return (0); 681 } 682 error = ENOTTY; 683 } 684 /* 685 * If external processing and packet mode send ioctl packet. 686 */ 687 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 688 switch(cmd) { 689 case TIOCSETA: 690 case TIOCSETAW: 691 case TIOCSETAF: 692 #ifdef COMPAT_43 693 /* wkt */ 694 case TIOCSETP: 695 case TIOCSETN: 696 case TIOCSETC: 697 case TIOCSLTC: 698 case TIOCLBIS: 699 case TIOCLBIC: 700 case TIOCLSET: 701 #endif 702 pti->pt_send |= TIOCPKT_IOCTL; 703 default: 704 break; 705 } 706 } 707 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 708 && CCEQ(cc[VSTART], CTRL('q')); 709 if (pti->pt_flags & PF_NOSTOP) { 710 if (stop) { 711 pti->pt_send &= ~TIOCPKT_NOSTOP; 712 pti->pt_send |= TIOCPKT_DOSTOP; 713 pti->pt_flags &= ~PF_NOSTOP; 714 ptcwakeup(tp, FREAD); 715 } 716 } else { 717 if (!stop) { 718 pti->pt_send &= ~TIOCPKT_DOSTOP; 719 pti->pt_send |= TIOCPKT_NOSTOP; 720 pti->pt_flags |= PF_NOSTOP; 721 ptcwakeup(tp, FREAD); 722 } 723 } 724 return (error); 725 } 726
Indexes created Tue Sep 30 20:09:53 GMT 2025