tty_pty.c revision 1.13
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 1.13 1993/09/29 02:36:27 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 tp->t_session = 0; 306 307 /* XXX -hv- 6.Oct.92 this prevents the "hanging console bug" with X11 */ 308 if (constty==tp) 309 constty = 0; 310 311 pt_ioctl[minor(dev)].pt_flags &= ~PF_COPEN; 312 #ifdef broken 313 if ((pt_ioctl[minor(dev)].pt_flags & PF_SOPEN) == 0) { 314 ttyfree(tp); 315 pt_tty[minor(dev)] = (struct tty *)NULL; 316 } 317 #endif 318 return (0); 319 } 320 321 int 322 ptcread(dev, uio, flag) 323 dev_t dev; 324 struct uio *uio; 325 int flag; 326 { 327 register struct tty *tp = pt_tty[minor(dev)]; 328 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 329 u_char buf[BUFSIZ]; 330 int error = 0, cc; 331 332 /* 333 * We want to block until the slave 334 * is open, and there's something to read; 335 * but if we lost the slave or we're NBIO, 336 * then return the appropriate error instead. 337 */ 338 for (;;) { 339 if (tp->t_state&TS_ISOPEN) { 340 if (pti->pt_flags&PF_PKT && pti->pt_send) { 341 error = ureadc((int)pti->pt_send, uio); 342 if (error) 343 return (error); 344 if (pti->pt_send & TIOCPKT_IOCTL) { 345 cc = MIN(uio->uio_resid, 346 sizeof(tp->t_termios)); 347 uiomove((caddr_t)&tp->t_termios, cc, 348 uio); 349 } 350 pti->pt_send = 0; 351 return (0); 352 } 353 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 354 error = ureadc((int)pti->pt_ucntl, uio); 355 if (error) 356 return (error); 357 pti->pt_ucntl = 0; 358 return (0); 359 } 360 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 361 break; 362 } 363 if ((tp->t_state&TS_CARR_ON) == 0) 364 return (0); /* EOF */ 365 if (flag & IO_NDELAY) 366 return (EWOULDBLOCK); 367 if (error = tsleep((caddr_t)&tp->t_outq.c_cl, TTIPRI | PCATCH, 368 ttyin, 0)) 369 return (error); 370 } 371 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 372 error = ureadc(0, uio); 373 while (uio->uio_resid > 0 && error == 0) { 374 cc = q_to_b(&tp->t_outq, buf, MIN(uio->uio_resid, BUFSIZ)); 375 if (cc <= 0) 376 break; 377 error = uiomove(buf, cc, uio); 378 } 379 if (tp->t_outq.c_cc <= tp->t_lowat) { 380 if (tp->t_state&TS_ASLEEP) { 381 tp->t_state &= ~TS_ASLEEP; 382 wakeup((caddr_t)&tp->t_outq); 383 } 384 selwakeup(&tp->t_wsel); 385 } 386 return (error); 387 } 388 389 void 390 ptsstop(tp, flush) 391 register struct tty *tp; 392 int flush; 393 { 394 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 395 int flag; 396 397 /* note: FLUSHREAD and FLUSHWRITE already ok */ 398 if (flush == 0) { 399 flush = TIOCPKT_STOP; 400 pti->pt_flags |= PF_STOPPED; 401 } else 402 pti->pt_flags &= ~PF_STOPPED; 403 pti->pt_send |= flush; 404 /* change of perspective */ 405 flag = 0; 406 if (flush & FREAD) 407 flag |= FWRITE; 408 if (flush & FWRITE) 409 flag |= FREAD; 410 ptcwakeup(tp, flag); 411 } 412 413 int 414 ptcselect(dev, rw, p) 415 dev_t dev; 416 int rw; 417 struct proc *p; 418 { 419 register struct tty *tp = pt_tty[minor(dev)]; 420 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 421 int s; 422 423 if ((tp->t_state&TS_CARR_ON) == 0) 424 return (1); 425 switch (rw) { 426 427 case FREAD: 428 /* 429 * Need to block timeouts (ttrstart). 430 */ 431 s = spltty(); 432 if ((tp->t_state&TS_ISOPEN) && 433 tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) { 434 splx(s); 435 return (1); 436 } 437 splx(s); 438 /* FALLTHROUGH */ 439 440 case 0: /* exceptional */ 441 if ((tp->t_state&TS_ISOPEN) && 442 (pti->pt_flags&PF_PKT && pti->pt_send || 443 pti->pt_flags&PF_UCNTL && pti->pt_ucntl)) 444 return (1); 445 selrecord(p, &pti->pt_selr); 446 break; 447 448 449 case FWRITE: 450 if (tp->t_state&TS_ISOPEN) { 451 if (pti->pt_flags & PF_REMOTE) { 452 if (tp->t_canq.c_cc == 0) 453 return (1); 454 } else { 455 if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) 456 return (1); 457 if (tp->t_canq.c_cc == 0 && (tp->t_iflag&ICANON)) 458 return (1); 459 } 460 } 461 selrecord(p, &pti->pt_selw); 462 break; 463 464 } 465 return (0); 466 } 467 468 int 469 ptcwrite(dev, uio, flag) 470 dev_t dev; 471 register struct uio *uio; 472 int flag; 473 { 474 register struct tty *tp = pt_tty[minor(dev)]; 475 register u_char *cp; 476 register int cc = 0; 477 u_char locbuf[BUFSIZ]; 478 int cnt = 0; 479 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 480 int error = 0; 481 482 again: 483 if ((tp->t_state&TS_ISOPEN) == 0) 484 goto block; 485 if (pti->pt_flags & PF_REMOTE) { 486 if (tp->t_canq.c_cc) 487 goto block; 488 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 489 if (cc == 0) { 490 cc = min(uio->uio_resid, BUFSIZ); 491 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 492 cp = locbuf; 493 error = uiomove((caddr_t)cp, cc, uio); 494 if (error) 495 return (error); 496 /* check again for safety */ 497 if ((tp->t_state&TS_ISOPEN) == 0) 498 return (EIO); 499 } 500 if (cc) 501 (void) b_to_q(cp, cc, &tp->t_canq); 502 cc = 0; 503 } 504 (void) putc(0, &tp->t_canq); 505 ttwakeup(tp); 506 wakeup((caddr_t)&tp->t_canq); 507 return (0); 508 } 509 while (uio->uio_resid > 0) { 510 if (cc == 0) { 511 cc = min(uio->uio_resid, BUFSIZ); 512 cp = locbuf; 513 error = uiomove((caddr_t)cp, cc, uio); 514 if (error) 515 return (error); 516 /* check again for safety */ 517 if ((tp->t_state&TS_ISOPEN) == 0) 518 return (EIO); 519 } 520 while (cc > 0) { 521 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 522 (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 523 wakeup((caddr_t)&tp->t_rawq); 524 goto block; 525 } 526 (*linesw[tp->t_line].l_rint)(*cp++, tp); 527 cnt++; 528 cc--; 529 } 530 cc = 0; 531 } 532 return (0); 533 block: 534 /* 535 * Come here to wait for slave to open, for space 536 * in outq, or space in rawq. 537 */ 538 if ((tp->t_state&TS_CARR_ON) == 0) 539 return (EIO); 540 if (flag & IO_NDELAY) { 541 /* adjust for data copied in but not written */ 542 uio->uio_resid += cc; 543 if (cnt == 0) 544 return (EWOULDBLOCK); 545 return (0); 546 } 547 if (error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 548 ttyout, 0)) { 549 /* adjust for data copied in but not written */ 550 uio->uio_resid += cc; 551 return (error); 552 } 553 goto again; 554 } 555 556 /*ARGSUSED*/ 557 int 558 ptyioctl(dev, cmd, data, flag) 559 caddr_t data; 560 int cmd, flag; 561 dev_t dev; 562 { 563 register struct tty *tp = pt_tty[minor(dev)]; 564 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 565 register u_char *cc = tp->t_cc; 566 int stop, error; 567 568 /* 569 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 570 * ttywflush(tp) will hang if there are characters in the outq. 571 */ 572 if (cmd == TIOCEXT) { 573 /* 574 * When the EXTPROC bit is being toggled, we need 575 * to send an TIOCPKT_IOCTL if the packet driver 576 * is turned on. 577 */ 578 if (*(int *)data) { 579 if (pti->pt_flags & PF_PKT) { 580 pti->pt_send |= TIOCPKT_IOCTL; 581 ptcwakeup(tp, FREAD); 582 } 583 tp->t_lflag |= EXTPROC; 584 } else { 585 if ((tp->t_state & EXTPROC) && 586 (pti->pt_flags & PF_PKT)) { 587 pti->pt_send |= TIOCPKT_IOCTL; 588 ptcwakeup(tp, FREAD); 589 } 590 tp->t_lflag &= ~EXTPROC; 591 } 592 return(0); 593 } else 594 if (cdevsw[major(dev)].d_open == ptcopen) 595 switch (cmd) { 596 597 case TIOCGPGRP: 598 /* 599 * We aviod calling ttioctl on the controller since, 600 * in that case, tp must be the controlling terminal. 601 */ 602 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 603 return (0); 604 605 case TIOCPKT: 606 if (*(int *)data) { 607 if (pti->pt_flags & PF_UCNTL) 608 return (EINVAL); 609 pti->pt_flags |= PF_PKT; 610 } else 611 pti->pt_flags &= ~PF_PKT; 612 return (0); 613 614 case TIOCUCNTL: 615 if (*(int *)data) { 616 if (pti->pt_flags & PF_PKT) 617 return (EINVAL); 618 pti->pt_flags |= PF_UCNTL; 619 } else 620 pti->pt_flags &= ~PF_UCNTL; 621 return (0); 622 623 case TIOCREMOTE: 624 if (*(int *)data) 625 pti->pt_flags |= PF_REMOTE; 626 else 627 pti->pt_flags &= ~PF_REMOTE; 628 ttyflush(tp, FREAD|FWRITE); 629 return (0); 630 631 #ifdef COMPAT_43 632 /* wkt */ 633 case TIOCSETP: 634 case TIOCSETN: 635 #endif 636 case TIOCSETD: 637 case TIOCSETA: 638 case TIOCSETAW: 639 case TIOCSETAF: 640 flushq(&tp->t_outq); 641 break; 642 643 case TIOCSIG: 644 if (*(unsigned int *)data >= NSIG) 645 return(EINVAL); 646 if ((tp->t_lflag&NOFLSH) == 0) 647 ttyflush(tp, FREAD|FWRITE); 648 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 649 if ((*(unsigned int *)data == SIGINFO) && 650 ((tp->t_lflag&NOKERNINFO) == 0)) 651 ttyinfo(tp); 652 return(0); 653 } 654 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag); 655 if (error < 0) 656 error = ttioctl(tp, cmd, data, flag); 657 /* 658 * Since we use the tty queues internally, 659 * pty's can't be switched to disciplines which overwrite 660 * the queues. We can't tell anything about the discipline 661 * from here... 662 */ 663 if (linesw[tp->t_line].l_rint != ttyinput) { 664 (*linesw[tp->t_line].l_close)(tp, flag); 665 tp->t_line = TTYDISC; 666 (void)(*linesw[tp->t_line].l_open)(dev, tp); 667 error = ENOTTY; 668 } 669 if (error < 0) { 670 if (pti->pt_flags & PF_UCNTL && 671 (cmd & ~0xff) == UIOCCMD(0)) { 672 if (cmd & 0xff) { 673 pti->pt_ucntl = (u_char)cmd; 674 ptcwakeup(tp, FREAD); 675 } 676 return (0); 677 } 678 error = ENOTTY; 679 } 680 /* 681 * If external processing and packet mode send ioctl packet. 682 */ 683 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 684 switch(cmd) { 685 case TIOCSETA: 686 case TIOCSETAW: 687 case TIOCSETAF: 688 #ifdef COMPAT_43 689 /* wkt */ 690 case TIOCSETP: 691 case TIOCSETN: 692 case TIOCSETC: 693 case TIOCSLTC: 694 case TIOCLBIS: 695 case TIOCLBIC: 696 case TIOCLSET: 697 #endif 698 pti->pt_send |= TIOCPKT_IOCTL; 699 default: 700 break; 701 } 702 } 703 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 704 && CCEQ(cc[VSTART], CTRL('q')); 705 if (pti->pt_flags & PF_NOSTOP) { 706 if (stop) { 707 pti->pt_send &= ~TIOCPKT_NOSTOP; 708 pti->pt_send |= TIOCPKT_DOSTOP; 709 pti->pt_flags &= ~PF_NOSTOP; 710 ptcwakeup(tp, FREAD); 711 } 712 } else { 713 if (!stop) { 714 pti->pt_send &= ~TIOCPKT_DOSTOP; 715 pti->pt_send |= TIOCPKT_NOSTOP; 716 pti->pt_flags |= PF_NOSTOP; 717 ptcwakeup(tp, FREAD); 718 } 719 } 720 return (error); 721 } 722 #endif 723
Indexes created Wed Sep 24 05:09:52 GMT 2025