tty_pty.c revision 1.37
1 /* $NetBSD: tty_pty.c,v 1.37 1996/09/05 15:31:40 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 /* Macros to clear/set/test flags. */ 65 #define SET(t, f) (t) |= (f) 66 #define CLR(t, f) (t) &= ~((unsigned)(f)) 67 #define ISSET(t, f) ((t) & (f)) 68 69 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 70 71 /* 72 * pts == /dev/tty[pqrs]? 73 * ptc == /dev/pty[pqrs]? 74 */ 75 struct pt_softc { 76 struct tty *pt_tty; 77 int pt_flags; 78 struct selinfo pt_selr, pt_selw; 79 u_char pt_send; 80 u_char pt_ucntl; 81 } pt_softc[NPTY]; /* XXX */ 82 int npty = NPTY; /* for pstat -t */ 83 84 #define PF_PKT 0x08 /* packet mode */ 85 #define PF_STOPPED 0x10 /* user told stopped */ 86 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 87 #define PF_NOSTOP 0x40 88 #define PF_UCNTL 0x80 /* user control mode */ 89 90 void ptyattach __P((int)); 91 void ptcwakeup __P((struct tty *, int)); 92 struct tty *ptytty __P((dev_t)); 93 void ptsstart __P((struct tty *)); 94 95 /* 96 * Establish n (or default if n is 1) ptys in the system. 97 */ 98 void 99 ptyattach(n) 100 int n; 101 { 102 #ifdef notyet 103 #define DEFAULT_NPTY 32 104 105 /* maybe should allow 0 => none? */ 106 if (n <= 1) 107 n = DEFAULT_NPTY; 108 pt_softc = malloc(n * sizeof(struct pt_softc), M_DEVBUF, M_WAITOK); 109 npty = n; 110 #endif 111 } 112 113 /*ARGSUSED*/ 114 int 115 ptsopen(dev, flag, devtype, p) 116 dev_t dev; 117 int flag, devtype; 118 struct proc *p; 119 { 120 struct pt_softc *pti; 121 register struct tty *tp; 122 int error; 123 124 if (minor(dev) >= npty) 125 return (ENXIO); 126 pti = &pt_softc[minor(dev)]; 127 if (!pti->pt_tty) { 128 tp = pti->pt_tty = ttymalloc(); 129 tty_attach(tp); 130 } 131 else 132 tp = pti->pt_tty; 133 if (!ISSET(tp->t_state, TS_ISOPEN)) { 134 SET(tp->t_state, TS_WOPEN); 135 ttychars(tp); /* Set up default chars */ 136 tp->t_iflag = TTYDEF_IFLAG; 137 tp->t_oflag = TTYDEF_OFLAG; 138 tp->t_lflag = TTYDEF_LFLAG; 139 tp->t_cflag = TTYDEF_CFLAG; 140 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 141 ttsetwater(tp); /* would be done in xxparam() */ 142 } else if (ISSET(tp->t_state, TS_XCLUDE) && p->p_ucred->cr_uid != 0) 143 return (EBUSY); 144 if (tp->t_oproc) /* Ctrlr still around. */ 145 SET(tp->t_state, TS_CARR_ON); 146 while (!ISSET(tp->t_state, TS_CARR_ON)) { 147 SET(tp->t_state, TS_WOPEN); 148 if (flag&FNONBLOCK) 149 break; 150 error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH, 151 ttopen, 0); 152 if (error) 153 return (error); 154 } 155 error = (*linesw[tp->t_line].l_open)(dev, tp); 156 ptcwakeup(tp, FREAD|FWRITE); 157 return (error); 158 } 159 160 int 161 ptsclose(dev, flag, mode, p) 162 dev_t dev; 163 int flag, mode; 164 struct proc *p; 165 { 166 register struct pt_softc *pti = &pt_softc[minor(dev)]; 167 register struct tty *tp = pti->pt_tty; 168 int error; 169 170 error = (*linesw[tp->t_line].l_close)(tp, flag); 171 error |= ttyclose(tp); 172 ptcwakeup(tp, FREAD|FWRITE); 173 return (error); 174 } 175 176 int 177 ptsread(dev, uio, flag) 178 dev_t dev; 179 struct uio *uio; 180 int flag; 181 { 182 struct proc *p = curproc; 183 register struct pt_softc *pti = &pt_softc[minor(dev)]; 184 register struct tty *tp = pti->pt_tty; 185 int error = 0; 186 187 again: 188 if (pti->pt_flags & PF_REMOTE) { 189 while (isbackground(p, tp)) { 190 if ((p->p_sigignore & sigmask(SIGTTIN)) || 191 (p->p_sigmask & sigmask(SIGTTIN)) || 192 p->p_pgrp->pg_jobc == 0 || 193 p->p_flag & P_PPWAIT) 194 return (EIO); 195 pgsignal(p->p_pgrp, SIGTTIN, 1); 196 error = ttysleep(tp, (caddr_t)&lbolt, 197 TTIPRI | PCATCH, ttybg, 0); 198 if (error) 199 return (error); 200 } 201 if (tp->t_canq.c_cc == 0) { 202 if (flag & IO_NDELAY) 203 return (EWOULDBLOCK); 204 error = ttysleep(tp, (caddr_t)&tp->t_canq, 205 TTIPRI | PCATCH, ttyin, 0); 206 if (error) 207 return (error); 208 goto again; 209 } 210 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 211 if (ureadc(getc(&tp->t_canq), uio) < 0) { 212 error = EFAULT; 213 break; 214 } 215 if (tp->t_canq.c_cc == 1) 216 (void) getc(&tp->t_canq); 217 if (tp->t_canq.c_cc) 218 return (error); 219 } else 220 if (tp->t_oproc) 221 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 222 ptcwakeup(tp, FWRITE); 223 return (error); 224 } 225 226 /* 227 * Write to pseudo-tty. 228 * Wakeups of controlling tty will happen 229 * indirectly, when tty driver calls ptsstart. 230 */ 231 int 232 ptswrite(dev, uio, flag) 233 dev_t dev; 234 struct uio *uio; 235 int flag; 236 { 237 register struct pt_softc *pti = &pt_softc[minor(dev)]; 238 register struct tty *tp = pti->pt_tty; 239 240 if (tp->t_oproc == 0) 241 return (EIO); 242 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 243 } 244 245 /* 246 * Start output on pseudo-tty. 247 * Wake up process selecting or sleeping for input from controlling tty. 248 */ 249 void 250 ptsstart(tp) 251 struct tty *tp; 252 { 253 register struct pt_softc *pti = &pt_softc[minor(tp->t_dev)]; 254 255 if (ISSET(tp->t_state, TS_TTSTOP)) 256 return; 257 if (pti->pt_flags & PF_STOPPED) { 258 pti->pt_flags &= ~PF_STOPPED; 259 pti->pt_send = TIOCPKT_START; 260 } 261 ptcwakeup(tp, FREAD); 262 } 263 264 void 265 ptsstop(tp, flush) 266 register struct tty *tp; 267 int flush; 268 { 269 struct pt_softc *pti = &pt_softc[minor(tp->t_dev)]; 270 int flag; 271 272 /* note: FLUSHREAD and FLUSHWRITE already ok */ 273 if (flush == 0) { 274 flush = TIOCPKT_STOP; 275 pti->pt_flags |= PF_STOPPED; 276 } else 277 pti->pt_flags &= ~PF_STOPPED; 278 pti->pt_send |= flush; 279 /* change of perspective */ 280 flag = 0; 281 if (flush & FREAD) 282 flag |= FWRITE; 283 if (flush & FWRITE) 284 flag |= FREAD; 285 ptcwakeup(tp, flag); 286 } 287 288 void 289 ptcwakeup(tp, flag) 290 struct tty *tp; 291 int flag; 292 { 293 struct pt_softc *pti = &pt_softc[minor(tp->t_dev)]; 294 295 if (flag & FREAD) { 296 selwakeup(&pti->pt_selr); 297 wakeup((caddr_t)&tp->t_outq.c_cf); 298 } 299 if (flag & FWRITE) { 300 selwakeup(&pti->pt_selw); 301 wakeup((caddr_t)&tp->t_rawq.c_cf); 302 } 303 } 304 305 int ptcopen __P((dev_t, int, int, struct proc *)); 306 307 /*ARGSUSED*/ 308 int 309 ptcopen(dev, flag, devtype, p) 310 dev_t dev; 311 int flag, devtype; 312 struct proc *p; 313 { 314 struct pt_softc *pti; 315 register struct tty *tp; 316 317 if (minor(dev) >= npty) 318 return (ENXIO); 319 pti = &pt_softc[minor(dev)]; 320 if (!pti->pt_tty) { 321 tp = pti->pt_tty = ttymalloc(); 322 tty_attach(tp); 323 } 324 else 325 tp = pti->pt_tty; 326 if (tp->t_oproc) 327 return (EIO); 328 tp->t_oproc = ptsstart; 329 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 330 CLR(tp->t_lflag, EXTPROC); 331 pti->pt_flags = 0; 332 pti->pt_send = 0; 333 pti->pt_ucntl = 0; 334 return (0); 335 } 336 337 /*ARGSUSED*/ 338 int 339 ptcclose(dev, flag, devtype, p) 340 dev_t dev; 341 int flag, devtype; 342 struct proc *p; 343 { 344 register struct pt_softc *pti = &pt_softc[minor(dev)]; 345 register struct tty *tp = pti->pt_tty; 346 347 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 348 CLR(tp->t_state, TS_CARR_ON); 349 tp->t_oproc = 0; /* mark closed */ 350 return (0); 351 } 352 353 int 354 ptcread(dev, uio, flag) 355 dev_t dev; 356 struct uio *uio; 357 int flag; 358 { 359 register struct pt_softc *pti = &pt_softc[minor(dev)]; 360 register struct tty *tp = pti->pt_tty; 361 char buf[BUFSIZ]; 362 int error = 0, cc; 363 364 /* 365 * We want to block until the slave 366 * is open, and there's something to read; 367 * but if we lost the slave or we're NBIO, 368 * then return the appropriate error instead. 369 */ 370 for (;;) { 371 if (ISSET(tp->t_state, TS_ISOPEN)) { 372 if (pti->pt_flags&PF_PKT && pti->pt_send) { 373 error = ureadc((int)pti->pt_send, uio); 374 if (error) 375 return (error); 376 if (pti->pt_send & TIOCPKT_IOCTL) { 377 cc = min(uio->uio_resid, 378 sizeof(tp->t_termios)); 379 uiomove((caddr_t) &tp->t_termios, 380 cc, uio); 381 } 382 pti->pt_send = 0; 383 return (0); 384 } 385 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 386 error = ureadc((int)pti->pt_ucntl, uio); 387 if (error) 388 return (error); 389 pti->pt_ucntl = 0; 390 return (0); 391 } 392 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 393 break; 394 } 395 if (!ISSET(tp->t_state, TS_CARR_ON)) 396 return (0); /* EOF */ 397 if (flag & IO_NDELAY) 398 return (EWOULDBLOCK); 399 error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH, 400 ttyin, 0); 401 if (error) 402 return (error); 403 } 404 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 405 error = ureadc(0, uio); 406 while (uio->uio_resid > 0 && error == 0) { 407 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 408 if (cc <= 0) 409 break; 410 error = uiomove(buf, cc, uio); 411 } 412 if (tp->t_outq.c_cc <= tp->t_lowat) { 413 if (ISSET(tp->t_state, TS_ASLEEP)) { 414 CLR(tp->t_state, TS_ASLEEP); 415 wakeup((caddr_t)&tp->t_outq); 416 } 417 selwakeup(&tp->t_wsel); 418 } 419 return (error); 420 } 421 422 423 int 424 ptcwrite(dev, uio, flag) 425 dev_t dev; 426 register struct uio *uio; 427 int flag; 428 { 429 register struct pt_softc *pti = &pt_softc[minor(dev)]; 430 register struct tty *tp = pti->pt_tty; 431 register u_char *cp = NULL; 432 register int cc = 0; 433 u_char locbuf[BUFSIZ]; 434 int cnt = 0; 435 int error = 0; 436 437 again: 438 if (!ISSET(tp->t_state, TS_ISOPEN)) 439 goto block; 440 if (pti->pt_flags & PF_REMOTE) { 441 if (tp->t_canq.c_cc) 442 goto block; 443 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 444 if (cc == 0) { 445 cc = min(uio->uio_resid, BUFSIZ); 446 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 447 cp = locbuf; 448 error = uiomove((caddr_t)cp, cc, uio); 449 if (error) 450 return (error); 451 /* check again for safety */ 452 if (!ISSET(tp->t_state, TS_ISOPEN)) 453 return (EIO); 454 } 455 if (cc) 456 (void) b_to_q((char *)cp, cc, &tp->t_canq); 457 cc = 0; 458 } 459 (void) putc(0, &tp->t_canq); 460 ttwakeup(tp); 461 wakeup((caddr_t)&tp->t_canq); 462 return (0); 463 } 464 while (uio->uio_resid > 0) { 465 if (cc == 0) { 466 cc = min(uio->uio_resid, BUFSIZ); 467 cp = locbuf; 468 error = uiomove((caddr_t)cp, cc, uio); 469 if (error) 470 return (error); 471 /* check again for safety */ 472 if (!ISSET(tp->t_state, TS_ISOPEN)) 473 return (EIO); 474 } 475 while (cc > 0) { 476 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 477 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_iflag, ICANON))) { 478 wakeup((caddr_t)&tp->t_rawq); 479 goto block; 480 } 481 (*linesw[tp->t_line].l_rint)(*cp++, tp); 482 cnt++; 483 cc--; 484 } 485 cc = 0; 486 } 487 return (0); 488 block: 489 /* 490 * Come here to wait for slave to open, for space 491 * in outq, or space in rawq. 492 */ 493 if (!ISSET(tp->t_state, TS_CARR_ON)) 494 return (EIO); 495 if (flag & IO_NDELAY) { 496 /* adjust for data copied in but not written */ 497 uio->uio_resid += cc; 498 if (cnt == 0) 499 return (EWOULDBLOCK); 500 return (0); 501 } 502 error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 503 ttyout, 0); 504 if (error) { 505 /* adjust for data copied in but not written */ 506 uio->uio_resid += cc; 507 return (error); 508 } 509 goto again; 510 } 511 512 int 513 ptcselect(dev, rw, p) 514 dev_t dev; 515 int rw; 516 struct proc *p; 517 { 518 register struct pt_softc *pti = &pt_softc[minor(dev)]; 519 register struct tty *tp = pti->pt_tty; 520 int s; 521 522 if (!ISSET(tp->t_state, TS_CARR_ON)) 523 return (1); 524 switch (rw) { 525 526 case FREAD: 527 /* 528 * Need to block timeouts (ttrstart). 529 */ 530 s = spltty(); 531 if (ISSET(tp->t_state, TS_ISOPEN) && 532 tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) { 533 splx(s); 534 return (1); 535 } 536 splx(s); 537 /* FALLTHROUGH */ 538 539 case 0: /* exceptional */ 540 if (ISSET(tp->t_state, TS_ISOPEN) && 541 (((pti->pt_flags & PF_PKT) && pti->pt_send) || 542 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 543 return (1); 544 selrecord(p, &pti->pt_selr); 545 break; 546 547 548 case FWRITE: 549 if (ISSET(tp->t_state, TS_ISOPEN)) { 550 if (pti->pt_flags & PF_REMOTE) { 551 if (tp->t_canq.c_cc == 0) 552 return (1); 553 } else { 554 if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) 555 return (1); 556 if (tp->t_canq.c_cc == 0 && ISSET(tp->t_iflag, ICANON)) 557 return (1); 558 } 559 } 560 selrecord(p, &pti->pt_selw); 561 break; 562 563 } 564 return (0); 565 } 566 567 568 struct tty * 569 ptytty(dev) 570 dev_t dev; 571 { 572 register struct pt_softc *pti = &pt_softc[minor(dev)]; 573 register struct tty *tp = pti->pt_tty; 574 575 return (tp); 576 } 577 578 /*ARGSUSED*/ 579 int 580 ptyioctl(dev, cmd, data, flag, p) 581 dev_t dev; 582 u_long cmd; 583 caddr_t data; 584 int flag; 585 struct proc *p; 586 { 587 register struct pt_softc *pti = &pt_softc[minor(dev)]; 588 register struct tty *tp = pti->pt_tty; 589 register u_char *cc = tp->t_cc; 590 int stop, error; 591 592 /* 593 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 594 * ttywflush(tp) will hang if there are characters in the outq. 595 */ 596 if (cmd == TIOCEXT) { 597 /* 598 * When the EXTPROC bit is being toggled, we need 599 * to send an TIOCPKT_IOCTL if the packet driver 600 * is turned on. 601 */ 602 if (*(int *)data) { 603 if (pti->pt_flags & PF_PKT) { 604 pti->pt_send |= TIOCPKT_IOCTL; 605 ptcwakeup(tp, FREAD); 606 } 607 SET(tp->t_lflag, EXTPROC); 608 } else { 609 if (ISSET(tp->t_state, EXTPROC) && 610 (pti->pt_flags & PF_PKT)) { 611 pti->pt_send |= TIOCPKT_IOCTL; 612 ptcwakeup(tp, FREAD); 613 } 614 CLR(tp->t_lflag, EXTPROC); 615 } 616 return(0); 617 } else 618 if (cdevsw[major(dev)].d_open == ptcopen) 619 switch (cmd) { 620 621 case TIOCGPGRP: 622 #ifdef COMPAT_SUNOS 623 { 624 /* 625 * I'm not sure about SunOS TIOCGPGRP semantics 626 * on PTYs, but it's something like this: 627 */ 628 extern struct emul emul_sunos; 629 if (p->p_emul == &emul_sunos && tp->t_pgrp == 0) 630 return (EIO); 631 *(int *)data = tp->t_pgrp->pg_id; 632 return (0); 633 } 634 #endif 635 /* 636 * We avoid calling ttioctl on the controller since, 637 * in that case, tp must be the controlling terminal. 638 */ 639 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 640 return (0); 641 642 case TIOCPKT: 643 if (*(int *)data) { 644 if (pti->pt_flags & PF_UCNTL) 645 return (EINVAL); 646 pti->pt_flags |= PF_PKT; 647 } else 648 pti->pt_flags &= ~PF_PKT; 649 return (0); 650 651 case TIOCUCNTL: 652 if (*(int *)data) { 653 if (pti->pt_flags & PF_PKT) 654 return (EINVAL); 655 pti->pt_flags |= PF_UCNTL; 656 } else 657 pti->pt_flags &= ~PF_UCNTL; 658 return (0); 659 660 case TIOCREMOTE: 661 if (*(int *)data) 662 pti->pt_flags |= PF_REMOTE; 663 else 664 pti->pt_flags &= ~PF_REMOTE; 665 ttyflush(tp, FREAD|FWRITE); 666 return (0); 667 668 #ifdef COMPAT_OLDTTY 669 case TIOCSETP: 670 case TIOCSETN: 671 #endif 672 case TIOCSETD: 673 case TIOCSETA: 674 case TIOCSETAW: 675 case TIOCSETAF: 676 ndflush(&tp->t_outq, tp->t_outq.c_cc); 677 break; 678 679 case TIOCSIG: 680 if (*(unsigned int *)data >= NSIG) 681 return(EINVAL); 682 if (!ISSET(tp->t_lflag, NOFLSH)) 683 ttyflush(tp, FREAD|FWRITE); 684 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 685 if ((*(unsigned int *)data == SIGINFO) && 686 (!ISSET(tp->t_lflag, NOKERNINFO))) 687 ttyinfo(tp); 688 return(0); 689 } 690 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 691 if (error < 0) 692 error = ttioctl(tp, cmd, data, flag, p); 693 if (error < 0) { 694 if (pti->pt_flags & PF_UCNTL && 695 (cmd & ~0xff) == UIOCCMD(0)) { 696 if (cmd & 0xff) { 697 pti->pt_ucntl = (u_char)cmd; 698 ptcwakeup(tp, FREAD); 699 } 700 return (0); 701 } 702 error = ENOTTY; 703 } 704 /* 705 * If external processing and packet mode send ioctl packet. 706 */ 707 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 708 switch(cmd) { 709 case TIOCSETA: 710 case TIOCSETAW: 711 case TIOCSETAF: 712 #ifdef COMPAT_OLDTTY 713 case TIOCSETP: 714 case TIOCSETN: 715 case TIOCSETC: 716 case TIOCSLTC: 717 case TIOCLBIS: 718 case TIOCLBIC: 719 case TIOCLSET: 720 #endif 721 pti->pt_send |= TIOCPKT_IOCTL; 722 ptcwakeup(tp, FREAD); 723 default: 724 break; 725 } 726 } 727 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 728 && CCEQ(cc[VSTART], CTRL('q')); 729 if (pti->pt_flags & PF_NOSTOP) { 730 if (stop) { 731 pti->pt_send &= ~TIOCPKT_NOSTOP; 732 pti->pt_send |= TIOCPKT_DOSTOP; 733 pti->pt_flags &= ~PF_NOSTOP; 734 ptcwakeup(tp, FREAD); 735 } 736 } else { 737 if (!stop) { 738 pti->pt_send &= ~TIOCPKT_DOSTOP; 739 pti->pt_send |= TIOCPKT_NOSTOP; 740 pti->pt_flags |= PF_NOSTOP; 741 ptcwakeup(tp, FREAD); 742 } 743 } 744 return (error); 745 } 746
Indexes created Tue Sep 30 20:09:53 GMT 2025