tty_pty.c revision 1.36
1 /* $NetBSD: tty_pty.c,v 1.36 1996/09/02 06:44:52 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)tty_pty.c 8.2 (Berkeley) 9/23/93 36 */ 37 38 /* 39 * Pseudo-teletype Driver 40 * (Actually two drivers, requiring two entries in 'cdevsw') 41 */ 42 #include "pty.h" /* XXX */ 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/ioctl.h> 47 #include <sys/proc.h> 48 #include <sys/tty.h> 49 #include <sys/file.h> 50 #include <sys/uio.h> 51 #include <sys/kernel.h> 52 #include <sys/vnode.h> 53 #include <sys/signalvar.h> 54 #include <sys/uio.h> 55 #include <sys/conf.h> 56 57 58 59 #if NPTY == 1 60 #undef NPTY 61 #define NPTY 32 /* crude XXX */ 62 #endif 63 64 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 65 66 /* 67 * pts == /dev/tty[pqrs]? 68 * ptc == /dev/pty[pqrs]? 69 */ 70 struct pt_softc { 71 struct tty *pt_tty; 72 int pt_flags; 73 struct selinfo pt_selr, pt_selw; 74 u_char pt_send; 75 u_char pt_ucntl; 76 } pt_softc[NPTY]; /* XXX */ 77 int npty = NPTY; /* for pstat -t */ 78 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 ptyattach __P((int)); 86 void ptcwakeup __P((struct tty *, int)); 87 struct tty *ptytty __P((dev_t)); 88 void ptsstart __P((struct tty *)); 89 90 /* 91 * Establish n (or default if n is 1) ptys in the system. 92 */ 93 void 94 ptyattach(n) 95 int n; 96 { 97 #ifdef notyet 98 #define DEFAULT_NPTY 32 99 100 /* maybe should allow 0 => none? */ 101 if (n <= 1) 102 n = DEFAULT_NPTY; 103 pt_softc = malloc(n * sizeof(struct pt_softc), M_DEVBUF, M_WAITOK); 104 npty = n; 105 #endif 106 } 107 108 /*ARGSUSED*/ 109 int 110 ptsopen(dev, flag, devtype, p) 111 dev_t dev; 112 int flag, devtype; 113 struct proc *p; 114 { 115 struct pt_softc *pti; 116 register struct tty *tp; 117 int error; 118 119 if (minor(dev) >= npty) 120 return (ENXIO); 121 pti = &pt_softc[minor(dev)]; 122 if (!pti->pt_tty) { 123 tp = pti->pt_tty = ttymalloc(); 124 tty_attach(tp); 125 } 126 else 127 tp = pti->pt_tty; 128 if ((tp->t_state & TS_ISOPEN) == 0) { 129 tp->t_state |= TS_WOPEN; 130 ttychars(tp); /* Set up default chars */ 131 tp->t_iflag = TTYDEF_IFLAG; 132 tp->t_oflag = TTYDEF_OFLAG; 133 tp->t_lflag = TTYDEF_LFLAG; 134 tp->t_cflag = TTYDEF_CFLAG; 135 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 136 ttsetwater(tp); /* would be done in xxparam() */ 137 } else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0) 138 return (EBUSY); 139 if (tp->t_oproc) /* Ctrlr still around. */ 140 tp->t_state |= TS_CARR_ON; 141 while ((tp->t_state & TS_CARR_ON) == 0) { 142 tp->t_state |= TS_WOPEN; 143 if (flag&FNONBLOCK) 144 break; 145 error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH, 146 ttopen, 0); 147 if (error) 148 return (error); 149 } 150 error = (*linesw[tp->t_line].l_open)(dev, tp); 151 ptcwakeup(tp, FREAD|FWRITE); 152 return (error); 153 } 154 155 int 156 ptsclose(dev, flag, mode, p) 157 dev_t dev; 158 int flag, mode; 159 struct proc *p; 160 { 161 register struct pt_softc *pti = &pt_softc[minor(dev)]; 162 register struct tty *tp = pti->pt_tty; 163 int error; 164 165 error = (*linesw[tp->t_line].l_close)(tp, flag); 166 error |= ttyclose(tp); 167 ptcwakeup(tp, FREAD|FWRITE); 168 return (error); 169 } 170 171 int 172 ptsread(dev, uio, flag) 173 dev_t dev; 174 struct uio *uio; 175 int flag; 176 { 177 struct proc *p = curproc; 178 register struct pt_softc *pti = &pt_softc[minor(dev)]; 179 register struct tty *tp = pti->pt_tty; 180 int error = 0; 181 182 again: 183 if (pti->pt_flags & PF_REMOTE) { 184 while (isbackground(p, tp)) { 185 if ((p->p_sigignore & sigmask(SIGTTIN)) || 186 (p->p_sigmask & sigmask(SIGTTIN)) || 187 p->p_pgrp->pg_jobc == 0 || 188 p->p_flag & P_PPWAIT) 189 return (EIO); 190 pgsignal(p->p_pgrp, SIGTTIN, 1); 191 error = ttysleep(tp, (caddr_t)&lbolt, 192 TTIPRI | PCATCH, ttybg, 0); 193 if (error) 194 return (error); 195 } 196 if (tp->t_canq.c_cc == 0) { 197 if (flag & IO_NDELAY) 198 return (EWOULDBLOCK); 199 error = ttysleep(tp, (caddr_t)&tp->t_canq, 200 TTIPRI | PCATCH, ttyin, 0); 201 if (error) 202 return (error); 203 goto again; 204 } 205 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 206 if (ureadc(getc(&tp->t_canq), uio) < 0) { 207 error = EFAULT; 208 break; 209 } 210 if (tp->t_canq.c_cc == 1) 211 (void) getc(&tp->t_canq); 212 if (tp->t_canq.c_cc) 213 return (error); 214 } else 215 if (tp->t_oproc) 216 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 217 ptcwakeup(tp, FWRITE); 218 return (error); 219 } 220 221 /* 222 * Write to pseudo-tty. 223 * Wakeups of controlling tty will happen 224 * indirectly, when tty driver calls ptsstart. 225 */ 226 int 227 ptswrite(dev, uio, flag) 228 dev_t dev; 229 struct uio *uio; 230 int flag; 231 { 232 register struct pt_softc *pti = &pt_softc[minor(dev)]; 233 register struct tty *tp = pti->pt_tty; 234 235 if (tp->t_oproc == 0) 236 return (EIO); 237 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 238 } 239 240 /* 241 * Start output on pseudo-tty. 242 * Wake up process selecting or sleeping for input from controlling tty. 243 */ 244 void 245 ptsstart(tp) 246 struct tty *tp; 247 { 248 register struct pt_softc *pti = &pt_softc[minor(tp->t_dev)]; 249 250 if (tp->t_state & TS_TTSTOP) 251 return; 252 if (pti->pt_flags & PF_STOPPED) { 253 pti->pt_flags &= ~PF_STOPPED; 254 pti->pt_send = TIOCPKT_START; 255 } 256 ptcwakeup(tp, FREAD); 257 } 258 259 void 260 ptsstop(tp, flush) 261 register struct tty *tp; 262 int flush; 263 { 264 struct pt_softc *pti = &pt_softc[minor(tp->t_dev)]; 265 int flag; 266 267 /* note: FLUSHREAD and FLUSHWRITE already ok */ 268 if (flush == 0) { 269 flush = TIOCPKT_STOP; 270 pti->pt_flags |= PF_STOPPED; 271 } else 272 pti->pt_flags &= ~PF_STOPPED; 273 pti->pt_send |= flush; 274 /* change of perspective */ 275 flag = 0; 276 if (flush & FREAD) 277 flag |= FWRITE; 278 if (flush & FWRITE) 279 flag |= FREAD; 280 ptcwakeup(tp, flag); 281 } 282 283 void 284 ptcwakeup(tp, flag) 285 struct tty *tp; 286 int flag; 287 { 288 struct pt_softc *pti = &pt_softc[minor(tp->t_dev)]; 289 290 if (flag & FREAD) { 291 selwakeup(&pti->pt_selr); 292 wakeup((caddr_t)&tp->t_outq.c_cf); 293 } 294 if (flag & FWRITE) { 295 selwakeup(&pti->pt_selw); 296 wakeup((caddr_t)&tp->t_rawq.c_cf); 297 } 298 } 299 300 int ptcopen __P((dev_t, int, int, struct proc *)); 301 302 /*ARGSUSED*/ 303 int 304 ptcopen(dev, flag, devtype, p) 305 dev_t dev; 306 int flag, devtype; 307 struct proc *p; 308 { 309 struct pt_softc *pti; 310 register struct tty *tp; 311 312 if (minor(dev) >= npty) 313 return (ENXIO); 314 pti = &pt_softc[minor(dev)]; 315 if (!pti->pt_tty) { 316 tp = pti->pt_tty = ttymalloc(); 317 tty_attach(tp); 318 } 319 else 320 tp = pti->pt_tty; 321 if (tp->t_oproc) 322 return (EIO); 323 tp->t_oproc = ptsstart; 324 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 325 tp->t_lflag &= ~EXTPROC; 326 pti->pt_flags = 0; 327 pti->pt_send = 0; 328 pti->pt_ucntl = 0; 329 return (0); 330 } 331 332 /*ARGSUSED*/ 333 int 334 ptcclose(dev, flag, devtype, p) 335 dev_t dev; 336 int flag, devtype; 337 struct proc *p; 338 { 339 register struct pt_softc *pti = &pt_softc[minor(dev)]; 340 register struct tty *tp = pti->pt_tty; 341 342 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 343 tp->t_state &= ~TS_CARR_ON; 344 tp->t_oproc = 0; /* mark closed */ 345 return (0); 346 } 347 348 int 349 ptcread(dev, uio, flag) 350 dev_t dev; 351 struct uio *uio; 352 int flag; 353 { 354 register struct pt_softc *pti = &pt_softc[minor(dev)]; 355 register struct tty *tp = pti->pt_tty; 356 char buf[BUFSIZ]; 357 int error = 0, cc; 358 359 /* 360 * We want to block until the slave 361 * is open, and there's something to read; 362 * but if we lost the slave or we're NBIO, 363 * then return the appropriate error instead. 364 */ 365 for (;;) { 366 if (tp->t_state&TS_ISOPEN) { 367 if (pti->pt_flags&PF_PKT && pti->pt_send) { 368 error = ureadc((int)pti->pt_send, uio); 369 if (error) 370 return (error); 371 if (pti->pt_send & TIOCPKT_IOCTL) { 372 cc = min(uio->uio_resid, 373 sizeof(tp->t_termios)); 374 uiomove((caddr_t) &tp->t_termios, 375 cc, uio); 376 } 377 pti->pt_send = 0; 378 return (0); 379 } 380 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 381 error = ureadc((int)pti->pt_ucntl, uio); 382 if (error) 383 return (error); 384 pti->pt_ucntl = 0; 385 return (0); 386 } 387 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 388 break; 389 } 390 if ((tp->t_state&TS_CARR_ON) == 0) 391 return (0); /* EOF */ 392 if (flag & IO_NDELAY) 393 return (EWOULDBLOCK); 394 error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH, 395 ttyin, 0); 396 if (error) 397 return (error); 398 } 399 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 400 error = ureadc(0, uio); 401 while (uio->uio_resid > 0 && error == 0) { 402 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 403 if (cc <= 0) 404 break; 405 error = uiomove(buf, cc, uio); 406 } 407 if (tp->t_outq.c_cc <= tp->t_lowat) { 408 if (tp->t_state&TS_ASLEEP) { 409 tp->t_state &= ~TS_ASLEEP; 410 wakeup((caddr_t)&tp->t_outq); 411 } 412 selwakeup(&tp->t_wsel); 413 } 414 return (error); 415 } 416 417 418 int 419 ptcwrite(dev, uio, flag) 420 dev_t dev; 421 register struct uio *uio; 422 int flag; 423 { 424 register struct pt_softc *pti = &pt_softc[minor(dev)]; 425 register struct tty *tp = pti->pt_tty; 426 register u_char *cp = NULL; 427 register int cc = 0; 428 u_char locbuf[BUFSIZ]; 429 int cnt = 0; 430 int error = 0; 431 432 again: 433 if ((tp->t_state&TS_ISOPEN) == 0) 434 goto block; 435 if (pti->pt_flags & PF_REMOTE) { 436 if (tp->t_canq.c_cc) 437 goto block; 438 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 439 if (cc == 0) { 440 cc = min(uio->uio_resid, BUFSIZ); 441 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 442 cp = locbuf; 443 error = uiomove((caddr_t)cp, cc, uio); 444 if (error) 445 return (error); 446 /* check again for safety */ 447 if ((tp->t_state&TS_ISOPEN) == 0) 448 return (EIO); 449 } 450 if (cc) 451 (void) b_to_q((char *)cp, cc, &tp->t_canq); 452 cc = 0; 453 } 454 (void) putc(0, &tp->t_canq); 455 ttwakeup(tp); 456 wakeup((caddr_t)&tp->t_canq); 457 return (0); 458 } 459 while (uio->uio_resid > 0) { 460 if (cc == 0) { 461 cc = min(uio->uio_resid, BUFSIZ); 462 cp = locbuf; 463 error = uiomove((caddr_t)cp, cc, uio); 464 if (error) 465 return (error); 466 /* check again for safety */ 467 if ((tp->t_state&TS_ISOPEN) == 0) 468 return (EIO); 469 } 470 while (cc > 0) { 471 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 472 (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 473 wakeup((caddr_t)&tp->t_rawq); 474 goto block; 475 } 476 (*linesw[tp->t_line].l_rint)(*cp++, tp); 477 cnt++; 478 cc--; 479 } 480 cc = 0; 481 } 482 return (0); 483 block: 484 /* 485 * Come here to wait for slave to open, for space 486 * in outq, or space in rawq. 487 */ 488 if ((tp->t_state&TS_CARR_ON) == 0) 489 return (EIO); 490 if (flag & IO_NDELAY) { 491 /* adjust for data copied in but not written */ 492 uio->uio_resid += cc; 493 if (cnt == 0) 494 return (EWOULDBLOCK); 495 return (0); 496 } 497 error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 498 ttyout, 0); 499 if (error) { 500 /* adjust for data copied in but not written */ 501 uio->uio_resid += cc; 502 return (error); 503 } 504 goto again; 505 } 506 507 int 508 ptcselect(dev, rw, p) 509 dev_t dev; 510 int rw; 511 struct proc *p; 512 { 513 register struct pt_softc *pti = &pt_softc[minor(dev)]; 514 register struct tty *tp = pti->pt_tty; 515 int s; 516 517 if ((tp->t_state&TS_CARR_ON) == 0) 518 return (1); 519 switch (rw) { 520 521 case FREAD: 522 /* 523 * Need to block timeouts (ttrstart). 524 */ 525 s = spltty(); 526 if ((tp->t_state&TS_ISOPEN) && 527 tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) { 528 splx(s); 529 return (1); 530 } 531 splx(s); 532 /* FALLTHROUGH */ 533 534 case 0: /* exceptional */ 535 if ((tp->t_state&TS_ISOPEN) && 536 (((pti->pt_flags & PF_PKT) && pti->pt_send) || 537 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 538 return (1); 539 selrecord(p, &pti->pt_selr); 540 break; 541 542 543 case FWRITE: 544 if (tp->t_state&TS_ISOPEN) { 545 if (pti->pt_flags & PF_REMOTE) { 546 if (tp->t_canq.c_cc == 0) 547 return (1); 548 } else { 549 if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) 550 return (1); 551 if (tp->t_canq.c_cc == 0 && (tp->t_iflag&ICANON)) 552 return (1); 553 } 554 } 555 selrecord(p, &pti->pt_selw); 556 break; 557 558 } 559 return (0); 560 } 561 562 563 struct tty * 564 ptytty(dev) 565 dev_t dev; 566 { 567 register struct pt_softc *pti = &pt_softc[minor(dev)]; 568 register struct tty *tp = pti->pt_tty; 569 570 return (tp); 571 } 572 573 /*ARGSUSED*/ 574 int 575 ptyioctl(dev, cmd, data, flag, p) 576 dev_t dev; 577 u_long cmd; 578 caddr_t data; 579 int flag; 580 struct proc *p; 581 { 582 register struct pt_softc *pti = &pt_softc[minor(dev)]; 583 register struct tty *tp = pti->pt_tty; 584 register u_char *cc = tp->t_cc; 585 int stop, error; 586 587 /* 588 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 589 * ttywflush(tp) will hang if there are characters in the outq. 590 */ 591 if (cmd == TIOCEXT) { 592 /* 593 * When the EXTPROC bit is being toggled, we need 594 * to send an TIOCPKT_IOCTL if the packet driver 595 * is turned on. 596 */ 597 if (*(int *)data) { 598 if (pti->pt_flags & PF_PKT) { 599 pti->pt_send |= TIOCPKT_IOCTL; 600 ptcwakeup(tp, FREAD); 601 } 602 tp->t_lflag |= EXTPROC; 603 } else { 604 if ((tp->t_state & EXTPROC) && 605 (pti->pt_flags & PF_PKT)) { 606 pti->pt_send |= TIOCPKT_IOCTL; 607 ptcwakeup(tp, FREAD); 608 } 609 tp->t_lflag &= ~EXTPROC; 610 } 611 return(0); 612 } else 613 if (cdevsw[major(dev)].d_open == ptcopen) 614 switch (cmd) { 615 616 case TIOCGPGRP: 617 #ifdef COMPAT_SUNOS 618 { 619 /* 620 * I'm not sure about SunOS TIOCGPGRP semantics 621 * on PTYs, but it's something like this: 622 */ 623 extern struct emul emul_sunos; 624 if (p->p_emul == &emul_sunos && tp->t_pgrp == 0) 625 return (EIO); 626 *(int *)data = tp->t_pgrp->pg_id; 627 return (0); 628 } 629 #endif 630 /* 631 * We avoid calling ttioctl on the controller since, 632 * in that case, tp must be the controlling terminal. 633 */ 634 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 635 return (0); 636 637 case TIOCPKT: 638 if (*(int *)data) { 639 if (pti->pt_flags & PF_UCNTL) 640 return (EINVAL); 641 pti->pt_flags |= PF_PKT; 642 } else 643 pti->pt_flags &= ~PF_PKT; 644 return (0); 645 646 case TIOCUCNTL: 647 if (*(int *)data) { 648 if (pti->pt_flags & PF_PKT) 649 return (EINVAL); 650 pti->pt_flags |= PF_UCNTL; 651 } else 652 pti->pt_flags &= ~PF_UCNTL; 653 return (0); 654 655 case TIOCREMOTE: 656 if (*(int *)data) 657 pti->pt_flags |= PF_REMOTE; 658 else 659 pti->pt_flags &= ~PF_REMOTE; 660 ttyflush(tp, FREAD|FWRITE); 661 return (0); 662 663 #ifdef COMPAT_OLDTTY 664 case TIOCSETP: 665 case TIOCSETN: 666 #endif 667 case TIOCSETD: 668 case TIOCSETA: 669 case TIOCSETAW: 670 case TIOCSETAF: 671 ndflush(&tp->t_outq, tp->t_outq.c_cc); 672 break; 673 674 case TIOCSIG: 675 if (*(unsigned int *)data >= NSIG) 676 return(EINVAL); 677 if ((tp->t_lflag&NOFLSH) == 0) 678 ttyflush(tp, FREAD|FWRITE); 679 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 680 if ((*(unsigned int *)data == SIGINFO) && 681 ((tp->t_lflag&NOKERNINFO) == 0)) 682 ttyinfo(tp); 683 return(0); 684 } 685 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 686 if (error < 0) 687 error = ttioctl(tp, cmd, data, flag, p); 688 if (error < 0) { 689 if (pti->pt_flags & PF_UCNTL && 690 (cmd & ~0xff) == UIOCCMD(0)) { 691 if (cmd & 0xff) { 692 pti->pt_ucntl = (u_char)cmd; 693 ptcwakeup(tp, FREAD); 694 } 695 return (0); 696 } 697 error = ENOTTY; 698 } 699 /* 700 * If external processing and packet mode send ioctl packet. 701 */ 702 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 703 switch(cmd) { 704 case TIOCSETA: 705 case TIOCSETAW: 706 case TIOCSETAF: 707 #ifdef COMPAT_OLDTTY 708 case TIOCSETP: 709 case TIOCSETN: 710 case TIOCSETC: 711 case TIOCSLTC: 712 case TIOCLBIS: 713 case TIOCLBIC: 714 case TIOCLSET: 715 #endif 716 pti->pt_send |= TIOCPKT_IOCTL; 717 ptcwakeup(tp, FREAD); 718 default: 719 break; 720 } 721 } 722 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 723 && CCEQ(cc[VSTART], CTRL('q')); 724 if (pti->pt_flags & PF_NOSTOP) { 725 if (stop) { 726 pti->pt_send &= ~TIOCPKT_NOSTOP; 727 pti->pt_send |= TIOCPKT_DOSTOP; 728 pti->pt_flags &= ~PF_NOSTOP; 729 ptcwakeup(tp, FREAD); 730 } 731 } else { 732 if (!stop) { 733 pti->pt_send &= ~TIOCPKT_DOSTOP; 734 pti->pt_send |= TIOCPKT_NOSTOP; 735 pti->pt_flags |= PF_NOSTOP; 736 ptcwakeup(tp, FREAD); 737 } 738 } 739 return (error); 740 } 741
Indexes created Tue Sep 23 02:09:52 GMT 2025