tty_pty.c revision 1.35
1 /* $NetBSD: tty_pty.c,v 1.35 1996/07/02 21:19:02 pk 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 int 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 return 0; 282 } 283 284 void 285 ptcwakeup(tp, flag) 286 struct tty *tp; 287 int flag; 288 { 289 struct pt_softc *pti = &pt_softc[minor(tp->t_dev)]; 290 291 if (flag & FREAD) { 292 selwakeup(&pti->pt_selr); 293 wakeup((caddr_t)&tp->t_outq.c_cf); 294 } 295 if (flag & FWRITE) { 296 selwakeup(&pti->pt_selw); 297 wakeup((caddr_t)&tp->t_rawq.c_cf); 298 } 299 } 300 301 int ptcopen __P((dev_t, int, int, struct proc *)); 302 303 /*ARGSUSED*/ 304 int 305 ptcopen(dev, flag, devtype, p) 306 dev_t dev; 307 int flag, devtype; 308 struct proc *p; 309 { 310 struct pt_softc *pti; 311 register struct tty *tp; 312 313 if (minor(dev) >= npty) 314 return (ENXIO); 315 pti = &pt_softc[minor(dev)]; 316 if (!pti->pt_tty) { 317 tp = pti->pt_tty = ttymalloc(); 318 tty_attach(tp); 319 } 320 else 321 tp = pti->pt_tty; 322 if (tp->t_oproc) 323 return (EIO); 324 tp->t_oproc = ptsstart; 325 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 326 tp->t_lflag &= ~EXTPROC; 327 pti->pt_flags = 0; 328 pti->pt_send = 0; 329 pti->pt_ucntl = 0; 330 return (0); 331 } 332 333 /*ARGSUSED*/ 334 int 335 ptcclose(dev, flag, devtype, p) 336 dev_t dev; 337 int flag, devtype; 338 struct proc *p; 339 { 340 register struct pt_softc *pti = &pt_softc[minor(dev)]; 341 register struct tty *tp = pti->pt_tty; 342 343 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 344 tp->t_state &= ~TS_CARR_ON; 345 tp->t_oproc = 0; /* mark closed */ 346 return (0); 347 } 348 349 int 350 ptcread(dev, uio, flag) 351 dev_t dev; 352 struct uio *uio; 353 int flag; 354 { 355 register struct pt_softc *pti = &pt_softc[minor(dev)]; 356 register struct tty *tp = pti->pt_tty; 357 char buf[BUFSIZ]; 358 int error = 0, cc; 359 360 /* 361 * We want to block until the slave 362 * is open, and there's something to read; 363 * but if we lost the slave or we're NBIO, 364 * then return the appropriate error instead. 365 */ 366 for (;;) { 367 if (tp->t_state&TS_ISOPEN) { 368 if (pti->pt_flags&PF_PKT && pti->pt_send) { 369 error = ureadc((int)pti->pt_send, uio); 370 if (error) 371 return (error); 372 if (pti->pt_send & TIOCPKT_IOCTL) { 373 cc = min(uio->uio_resid, 374 sizeof(tp->t_termios)); 375 uiomove((caddr_t) &tp->t_termios, 376 cc, uio); 377 } 378 pti->pt_send = 0; 379 return (0); 380 } 381 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 382 error = ureadc((int)pti->pt_ucntl, uio); 383 if (error) 384 return (error); 385 pti->pt_ucntl = 0; 386 return (0); 387 } 388 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 389 break; 390 } 391 if ((tp->t_state&TS_CARR_ON) == 0) 392 return (0); /* EOF */ 393 if (flag & IO_NDELAY) 394 return (EWOULDBLOCK); 395 error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH, 396 ttyin, 0); 397 if (error) 398 return (error); 399 } 400 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 401 error = ureadc(0, uio); 402 while (uio->uio_resid > 0 && error == 0) { 403 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 404 if (cc <= 0) 405 break; 406 error = uiomove(buf, cc, uio); 407 } 408 if (tp->t_outq.c_cc <= tp->t_lowat) { 409 if (tp->t_state&TS_ASLEEP) { 410 tp->t_state &= ~TS_ASLEEP; 411 wakeup((caddr_t)&tp->t_outq); 412 } 413 selwakeup(&tp->t_wsel); 414 } 415 return (error); 416 } 417 418 419 int 420 ptcwrite(dev, uio, flag) 421 dev_t dev; 422 register struct uio *uio; 423 int flag; 424 { 425 register struct pt_softc *pti = &pt_softc[minor(dev)]; 426 register struct tty *tp = pti->pt_tty; 427 register u_char *cp = NULL; 428 register int cc = 0; 429 u_char locbuf[BUFSIZ]; 430 int cnt = 0; 431 int error = 0; 432 433 again: 434 if ((tp->t_state&TS_ISOPEN) == 0) 435 goto block; 436 if (pti->pt_flags & PF_REMOTE) { 437 if (tp->t_canq.c_cc) 438 goto block; 439 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 440 if (cc == 0) { 441 cc = min(uio->uio_resid, BUFSIZ); 442 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 443 cp = locbuf; 444 error = uiomove((caddr_t)cp, cc, uio); 445 if (error) 446 return (error); 447 /* check again for safety */ 448 if ((tp->t_state&TS_ISOPEN) == 0) 449 return (EIO); 450 } 451 if (cc) 452 (void) b_to_q((char *)cp, cc, &tp->t_canq); 453 cc = 0; 454 } 455 (void) putc(0, &tp->t_canq); 456 ttwakeup(tp); 457 wakeup((caddr_t)&tp->t_canq); 458 return (0); 459 } 460 while (uio->uio_resid > 0) { 461 if (cc == 0) { 462 cc = min(uio->uio_resid, BUFSIZ); 463 cp = locbuf; 464 error = uiomove((caddr_t)cp, cc, uio); 465 if (error) 466 return (error); 467 /* check again for safety */ 468 if ((tp->t_state&TS_ISOPEN) == 0) 469 return (EIO); 470 } 471 while (cc > 0) { 472 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 473 (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 474 wakeup((caddr_t)&tp->t_rawq); 475 goto block; 476 } 477 (*linesw[tp->t_line].l_rint)(*cp++, tp); 478 cnt++; 479 cc--; 480 } 481 cc = 0; 482 } 483 return (0); 484 block: 485 /* 486 * Come here to wait for slave to open, for space 487 * in outq, or space in rawq. 488 */ 489 if ((tp->t_state&TS_CARR_ON) == 0) 490 return (EIO); 491 if (flag & IO_NDELAY) { 492 /* adjust for data copied in but not written */ 493 uio->uio_resid += cc; 494 if (cnt == 0) 495 return (EWOULDBLOCK); 496 return (0); 497 } 498 error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 499 ttyout, 0); 500 if (error) { 501 /* adjust for data copied in but not written */ 502 uio->uio_resid += cc; 503 return (error); 504 } 505 goto again; 506 } 507 508 int 509 ptcselect(dev, rw, p) 510 dev_t dev; 511 int rw; 512 struct proc *p; 513 { 514 register struct pt_softc *pti = &pt_softc[minor(dev)]; 515 register struct tty *tp = pti->pt_tty; 516 int s; 517 518 if ((tp->t_state&TS_CARR_ON) == 0) 519 return (1); 520 switch (rw) { 521 522 case FREAD: 523 /* 524 * Need to block timeouts (ttrstart). 525 */ 526 s = spltty(); 527 if ((tp->t_state&TS_ISOPEN) && 528 tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) { 529 splx(s); 530 return (1); 531 } 532 splx(s); 533 /* FALLTHROUGH */ 534 535 case 0: /* exceptional */ 536 if ((tp->t_state&TS_ISOPEN) && 537 (((pti->pt_flags & PF_PKT) && pti->pt_send) || 538 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 539 return (1); 540 selrecord(p, &pti->pt_selr); 541 break; 542 543 544 case FWRITE: 545 if (tp->t_state&TS_ISOPEN) { 546 if (pti->pt_flags & PF_REMOTE) { 547 if (tp->t_canq.c_cc == 0) 548 return (1); 549 } else { 550 if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) 551 return (1); 552 if (tp->t_canq.c_cc == 0 && (tp->t_iflag&ICANON)) 553 return (1); 554 } 555 } 556 selrecord(p, &pti->pt_selw); 557 break; 558 559 } 560 return (0); 561 } 562 563 564 struct tty * 565 ptytty(dev) 566 dev_t dev; 567 { 568 register struct pt_softc *pti = &pt_softc[minor(dev)]; 569 register struct tty *tp = pti->pt_tty; 570 571 return (tp); 572 } 573 574 /*ARGSUSED*/ 575 int 576 ptyioctl(dev, cmd, data, flag, p) 577 dev_t dev; 578 u_long cmd; 579 caddr_t data; 580 int flag; 581 struct proc *p; 582 { 583 register struct pt_softc *pti = &pt_softc[minor(dev)]; 584 register struct tty *tp = pti->pt_tty; 585 register u_char *cc = tp->t_cc; 586 int stop, error; 587 588 /* 589 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 590 * ttywflush(tp) will hang if there are characters in the outq. 591 */ 592 if (cmd == TIOCEXT) { 593 /* 594 * When the EXTPROC bit is being toggled, we need 595 * to send an TIOCPKT_IOCTL if the packet driver 596 * is turned on. 597 */ 598 if (*(int *)data) { 599 if (pti->pt_flags & PF_PKT) { 600 pti->pt_send |= TIOCPKT_IOCTL; 601 ptcwakeup(tp, FREAD); 602 } 603 tp->t_lflag |= EXTPROC; 604 } else { 605 if ((tp->t_state & EXTPROC) && 606 (pti->pt_flags & PF_PKT)) { 607 pti->pt_send |= TIOCPKT_IOCTL; 608 ptcwakeup(tp, FREAD); 609 } 610 tp->t_lflag &= ~EXTPROC; 611 } 612 return(0); 613 } else 614 if (cdevsw[major(dev)].d_open == ptcopen) 615 switch (cmd) { 616 617 case TIOCGPGRP: 618 #ifdef COMPAT_SUNOS 619 { 620 /* 621 * I'm not sure about SunOS TIOCGPGRP semantics 622 * on PTYs, but it's something like this: 623 */ 624 extern struct emul emul_sunos; 625 if (p->p_emul == &emul_sunos && tp->t_pgrp == 0) 626 return (EIO); 627 *(int *)data = tp->t_pgrp->pg_id; 628 return (0); 629 } 630 #endif 631 /* 632 * We avoid calling ttioctl on the controller since, 633 * in that case, tp must be the controlling terminal. 634 */ 635 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 636 return (0); 637 638 case TIOCPKT: 639 if (*(int *)data) { 640 if (pti->pt_flags & PF_UCNTL) 641 return (EINVAL); 642 pti->pt_flags |= PF_PKT; 643 } else 644 pti->pt_flags &= ~PF_PKT; 645 return (0); 646 647 case TIOCUCNTL: 648 if (*(int *)data) { 649 if (pti->pt_flags & PF_PKT) 650 return (EINVAL); 651 pti->pt_flags |= PF_UCNTL; 652 } else 653 pti->pt_flags &= ~PF_UCNTL; 654 return (0); 655 656 case TIOCREMOTE: 657 if (*(int *)data) 658 pti->pt_flags |= PF_REMOTE; 659 else 660 pti->pt_flags &= ~PF_REMOTE; 661 ttyflush(tp, FREAD|FWRITE); 662 return (0); 663 664 #ifdef COMPAT_OLDTTY 665 case TIOCSETP: 666 case TIOCSETN: 667 #endif 668 case TIOCSETD: 669 case TIOCSETA: 670 case TIOCSETAW: 671 case TIOCSETAF: 672 ndflush(&tp->t_outq, tp->t_outq.c_cc); 673 break; 674 675 case TIOCSIG: 676 if (*(unsigned int *)data >= NSIG) 677 return(EINVAL); 678 if ((tp->t_lflag&NOFLSH) == 0) 679 ttyflush(tp, FREAD|FWRITE); 680 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 681 if ((*(unsigned int *)data == SIGINFO) && 682 ((tp->t_lflag&NOKERNINFO) == 0)) 683 ttyinfo(tp); 684 return(0); 685 } 686 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 687 if (error < 0) 688 error = ttioctl(tp, cmd, data, flag, p); 689 if (error < 0) { 690 if (pti->pt_flags & PF_UCNTL && 691 (cmd & ~0xff) == UIOCCMD(0)) { 692 if (cmd & 0xff) { 693 pti->pt_ucntl = (u_char)cmd; 694 ptcwakeup(tp, FREAD); 695 } 696 return (0); 697 } 698 error = ENOTTY; 699 } 700 /* 701 * If external processing and packet mode send ioctl packet. 702 */ 703 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 704 switch(cmd) { 705 case TIOCSETA: 706 case TIOCSETAW: 707 case TIOCSETAF: 708 #ifdef COMPAT_OLDTTY 709 case TIOCSETP: 710 case TIOCSETN: 711 case TIOCSETC: 712 case TIOCSLTC: 713 case TIOCLBIS: 714 case TIOCLBIC: 715 case TIOCLSET: 716 #endif 717 pti->pt_send |= TIOCPKT_IOCTL; 718 ptcwakeup(tp, FREAD); 719 default: 720 break; 721 } 722 } 723 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 724 && CCEQ(cc[VSTART], CTRL('q')); 725 if (pti->pt_flags & PF_NOSTOP) { 726 if (stop) { 727 pti->pt_send &= ~TIOCPKT_NOSTOP; 728 pti->pt_send |= TIOCPKT_DOSTOP; 729 pti->pt_flags &= ~PF_NOSTOP; 730 ptcwakeup(tp, FREAD); 731 } 732 } else { 733 if (!stop) { 734 pti->pt_send &= ~TIOCPKT_DOSTOP; 735 pti->pt_send |= TIOCPKT_NOSTOP; 736 pti->pt_flags |= PF_NOSTOP; 737 ptcwakeup(tp, FREAD); 738 } 739 } 740 return (error); 741 } 742
Indexes created Wed Sep 24 05:09:52 GMT 2025