tty_pty.c revision 1.38
1 /* $NetBSD: tty_pty.c,v 1.38 1996/09/07 12:41:03 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 #include <sys/poll.h> 57 58 59 60 #if NPTY == 1 61 #undef NPTY 62 #define NPTY 32 /* crude XXX */ 63 #endif 64 65 /* Macros to clear/set/test flags. */ 66 #define SET(t, f) (t) |= (f) 67 #define CLR(t, f) (t) &= ~((unsigned)(f)) 68 #define ISSET(t, f) ((t) & (f)) 69 70 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 71 72 /* 73 * pts == /dev/tty[pqrs]? 74 * ptc == /dev/pty[pqrs]? 75 */ 76 struct pt_softc { 77 struct tty *pt_tty; 78 int pt_flags; 79 struct selinfo pt_selr, pt_selw; 80 u_char pt_send; 81 u_char pt_ucntl; 82 } pt_softc[NPTY]; /* XXX */ 83 int npty = NPTY; /* for pstat -t */ 84 85 #define PF_PKT 0x08 /* packet mode */ 86 #define PF_STOPPED 0x10 /* user told stopped */ 87 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 88 #define PF_NOSTOP 0x40 89 #define PF_UCNTL 0x80 /* user control mode */ 90 91 void ptyattach __P((int)); 92 void ptcwakeup __P((struct tty *, int)); 93 struct tty *ptytty __P((dev_t)); 94 void ptsstart __P((struct tty *)); 95 96 /* 97 * Establish n (or default if n is 1) ptys in the system. 98 */ 99 void 100 ptyattach(n) 101 int n; 102 { 103 #ifdef notyet 104 #define DEFAULT_NPTY 32 105 106 /* maybe should allow 0 => none? */ 107 if (n <= 1) 108 n = DEFAULT_NPTY; 109 pt_softc = malloc(n * sizeof(struct pt_softc), M_DEVBUF, M_WAITOK); 110 npty = n; 111 #endif 112 } 113 114 /*ARGSUSED*/ 115 int 116 ptsopen(dev, flag, devtype, p) 117 dev_t dev; 118 int flag, devtype; 119 struct proc *p; 120 { 121 struct pt_softc *pti; 122 register struct tty *tp; 123 int error; 124 125 if (minor(dev) >= npty) 126 return (ENXIO); 127 pti = &pt_softc[minor(dev)]; 128 if (!pti->pt_tty) { 129 tp = pti->pt_tty = ttymalloc(); 130 tty_attach(tp); 131 } 132 else 133 tp = pti->pt_tty; 134 if (!ISSET(tp->t_state, TS_ISOPEN)) { 135 SET(tp->t_state, TS_WOPEN); 136 ttychars(tp); /* Set up default chars */ 137 tp->t_iflag = TTYDEF_IFLAG; 138 tp->t_oflag = TTYDEF_OFLAG; 139 tp->t_lflag = TTYDEF_LFLAG; 140 tp->t_cflag = TTYDEF_CFLAG; 141 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 142 ttsetwater(tp); /* would be done in xxparam() */ 143 } else if (ISSET(tp->t_state, TS_XCLUDE) && p->p_ucred->cr_uid != 0) 144 return (EBUSY); 145 if (tp->t_oproc) /* Ctrlr still around. */ 146 SET(tp->t_state, TS_CARR_ON); 147 while (!ISSET(tp->t_state, TS_CARR_ON)) { 148 SET(tp->t_state, TS_WOPEN); 149 if (flag&FNONBLOCK) 150 break; 151 error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH, 152 ttopen, 0); 153 if (error) 154 return (error); 155 } 156 error = (*linesw[tp->t_line].l_open)(dev, tp); 157 ptcwakeup(tp, FREAD|FWRITE); 158 return (error); 159 } 160 161 int 162 ptsclose(dev, flag, mode, p) 163 dev_t dev; 164 int flag, mode; 165 struct proc *p; 166 { 167 register struct pt_softc *pti = &pt_softc[minor(dev)]; 168 register struct tty *tp = pti->pt_tty; 169 int error; 170 171 error = (*linesw[tp->t_line].l_close)(tp, flag); 172 error |= ttyclose(tp); 173 ptcwakeup(tp, FREAD|FWRITE); 174 return (error); 175 } 176 177 int 178 ptsread(dev, uio, flag) 179 dev_t dev; 180 struct uio *uio; 181 int flag; 182 { 183 struct proc *p = curproc; 184 register struct pt_softc *pti = &pt_softc[minor(dev)]; 185 register struct tty *tp = pti->pt_tty; 186 int error = 0; 187 188 again: 189 if (pti->pt_flags & PF_REMOTE) { 190 while (isbackground(p, tp)) { 191 if ((p->p_sigignore & sigmask(SIGTTIN)) || 192 (p->p_sigmask & sigmask(SIGTTIN)) || 193 p->p_pgrp->pg_jobc == 0 || 194 p->p_flag & P_PPWAIT) 195 return (EIO); 196 pgsignal(p->p_pgrp, SIGTTIN, 1); 197 error = ttysleep(tp, (caddr_t)&lbolt, 198 TTIPRI | PCATCH, ttybg, 0); 199 if (error) 200 return (error); 201 } 202 if (tp->t_canq.c_cc == 0) { 203 if (flag & IO_NDELAY) 204 return (EWOULDBLOCK); 205 error = ttysleep(tp, (caddr_t)&tp->t_canq, 206 TTIPRI | PCATCH, ttyin, 0); 207 if (error) 208 return (error); 209 goto again; 210 } 211 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 212 if (ureadc(getc(&tp->t_canq), uio) < 0) { 213 error = EFAULT; 214 break; 215 } 216 if (tp->t_canq.c_cc == 1) 217 (void) getc(&tp->t_canq); 218 if (tp->t_canq.c_cc) 219 return (error); 220 } else 221 if (tp->t_oproc) 222 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 223 ptcwakeup(tp, FWRITE); 224 return (error); 225 } 226 227 /* 228 * Write to pseudo-tty. 229 * Wakeups of controlling tty will happen 230 * indirectly, when tty driver calls ptsstart. 231 */ 232 int 233 ptswrite(dev, uio, flag) 234 dev_t dev; 235 struct uio *uio; 236 int flag; 237 { 238 register struct pt_softc *pti = &pt_softc[minor(dev)]; 239 register struct tty *tp = pti->pt_tty; 240 241 if (tp->t_oproc == 0) 242 return (EIO); 243 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 244 } 245 246 /* 247 * Start output on pseudo-tty. 248 * Wake up process polling or sleeping for input from controlling tty. 249 */ 250 void 251 ptsstart(tp) 252 struct tty *tp; 253 { 254 register struct pt_softc *pti = &pt_softc[minor(tp->t_dev)]; 255 256 if (ISSET(tp->t_state, TS_TTSTOP)) 257 return; 258 if (pti->pt_flags & PF_STOPPED) { 259 pti->pt_flags &= ~PF_STOPPED; 260 pti->pt_send = TIOCPKT_START; 261 } 262 ptcwakeup(tp, FREAD); 263 } 264 265 void 266 ptsstop(tp, flush) 267 register struct tty *tp; 268 int flush; 269 { 270 struct pt_softc *pti = &pt_softc[minor(tp->t_dev)]; 271 int flag; 272 273 /* note: FLUSHREAD and FLUSHWRITE already ok */ 274 if (flush == 0) { 275 flush = TIOCPKT_STOP; 276 pti->pt_flags |= PF_STOPPED; 277 } else 278 pti->pt_flags &= ~PF_STOPPED; 279 pti->pt_send |= flush; 280 /* change of perspective */ 281 flag = 0; 282 if (flush & FREAD) 283 flag |= FWRITE; 284 if (flush & FWRITE) 285 flag |= FREAD; 286 ptcwakeup(tp, flag); 287 } 288 289 void 290 ptcwakeup(tp, flag) 291 struct tty *tp; 292 int flag; 293 { 294 struct pt_softc *pti = &pt_softc[minor(tp->t_dev)]; 295 296 if (flag & FREAD) { 297 selwakeup(&pti->pt_selr); 298 wakeup((caddr_t)&tp->t_outq.c_cf); 299 } 300 if (flag & FWRITE) { 301 selwakeup(&pti->pt_selw); 302 wakeup((caddr_t)&tp->t_rawq.c_cf); 303 } 304 } 305 306 int ptcopen __P((dev_t, int, int, struct proc *)); 307 308 /*ARGSUSED*/ 309 int 310 ptcopen(dev, flag, devtype, p) 311 dev_t dev; 312 int flag, devtype; 313 struct proc *p; 314 { 315 struct pt_softc *pti; 316 register struct tty *tp; 317 318 if (minor(dev) >= npty) 319 return (ENXIO); 320 pti = &pt_softc[minor(dev)]; 321 if (!pti->pt_tty) { 322 tp = pti->pt_tty = ttymalloc(); 323 tty_attach(tp); 324 } 325 else 326 tp = pti->pt_tty; 327 if (tp->t_oproc) 328 return (EIO); 329 tp->t_oproc = ptsstart; 330 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 331 CLR(tp->t_lflag, EXTPROC); 332 pti->pt_flags = 0; 333 pti->pt_send = 0; 334 pti->pt_ucntl = 0; 335 return (0); 336 } 337 338 /*ARGSUSED*/ 339 int 340 ptcclose(dev, flag, devtype, p) 341 dev_t dev; 342 int flag, devtype; 343 struct proc *p; 344 { 345 register struct pt_softc *pti = &pt_softc[minor(dev)]; 346 register struct tty *tp = pti->pt_tty; 347 348 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 349 CLR(tp->t_state, TS_CARR_ON); 350 tp->t_oproc = 0; /* mark closed */ 351 return (0); 352 } 353 354 int 355 ptcread(dev, uio, flag) 356 dev_t dev; 357 struct uio *uio; 358 int flag; 359 { 360 register struct pt_softc *pti = &pt_softc[minor(dev)]; 361 register struct tty *tp = pti->pt_tty; 362 char buf[BUFSIZ]; 363 int error = 0, cc; 364 365 /* 366 * We want to block until the slave 367 * is open, and there's something to read; 368 * but if we lost the slave or we're NBIO, 369 * then return the appropriate error instead. 370 */ 371 for (;;) { 372 if (ISSET(tp->t_state, TS_ISOPEN)) { 373 if (pti->pt_flags&PF_PKT && pti->pt_send) { 374 error = ureadc((int)pti->pt_send, uio); 375 if (error) 376 return (error); 377 if (pti->pt_send & TIOCPKT_IOCTL) { 378 cc = min(uio->uio_resid, 379 sizeof(tp->t_termios)); 380 uiomove((caddr_t) &tp->t_termios, 381 cc, uio); 382 } 383 pti->pt_send = 0; 384 return (0); 385 } 386 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 387 error = ureadc((int)pti->pt_ucntl, uio); 388 if (error) 389 return (error); 390 pti->pt_ucntl = 0; 391 return (0); 392 } 393 if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) 394 break; 395 } 396 if (!ISSET(tp->t_state, TS_CARR_ON)) 397 return (0); /* EOF */ 398 if (flag & IO_NDELAY) 399 return (EWOULDBLOCK); 400 error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH, 401 ttyin, 0); 402 if (error) 403 return (error); 404 } 405 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 406 error = ureadc(0, uio); 407 while (uio->uio_resid > 0 && error == 0) { 408 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 409 if (cc <= 0) 410 break; 411 error = uiomove(buf, cc, uio); 412 } 413 if (tp->t_outq.c_cc <= tp->t_lowat) { 414 if (ISSET(tp->t_state, TS_ASLEEP)) { 415 CLR(tp->t_state, TS_ASLEEP); 416 wakeup((caddr_t)&tp->t_outq); 417 } 418 selwakeup(&tp->t_wsel); 419 } 420 return (error); 421 } 422 423 424 int 425 ptcwrite(dev, uio, flag) 426 dev_t dev; 427 register struct uio *uio; 428 int flag; 429 { 430 register struct pt_softc *pti = &pt_softc[minor(dev)]; 431 register struct tty *tp = pti->pt_tty; 432 register u_char *cp = NULL; 433 register int cc = 0; 434 u_char locbuf[BUFSIZ]; 435 int cnt = 0; 436 int error = 0; 437 438 again: 439 if (!ISSET(tp->t_state, TS_ISOPEN)) 440 goto block; 441 if (pti->pt_flags & PF_REMOTE) { 442 if (tp->t_canq.c_cc) 443 goto block; 444 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 445 if (cc == 0) { 446 cc = min(uio->uio_resid, BUFSIZ); 447 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 448 cp = locbuf; 449 error = uiomove((caddr_t)cp, cc, uio); 450 if (error) 451 return (error); 452 /* check again for safety */ 453 if (!ISSET(tp->t_state, TS_ISOPEN)) 454 return (EIO); 455 } 456 if (cc) 457 (void) b_to_q((char *)cp, cc, &tp->t_canq); 458 cc = 0; 459 } 460 (void) putc(0, &tp->t_canq); 461 ttwakeup(tp); 462 wakeup((caddr_t)&tp->t_canq); 463 return (0); 464 } 465 while (uio->uio_resid > 0) { 466 if (cc == 0) { 467 cc = min(uio->uio_resid, BUFSIZ); 468 cp = locbuf; 469 error = uiomove((caddr_t)cp, cc, uio); 470 if (error) 471 return (error); 472 /* check again for safety */ 473 if (!ISSET(tp->t_state, TS_ISOPEN)) 474 return (EIO); 475 } 476 while (cc > 0) { 477 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 478 (tp->t_canq.c_cc > 0 || !ISSET(tp->t_iflag, ICANON))) { 479 wakeup((caddr_t)&tp->t_rawq); 480 goto block; 481 } 482 (*linesw[tp->t_line].l_rint)(*cp++, tp); 483 cnt++; 484 cc--; 485 } 486 cc = 0; 487 } 488 return (0); 489 block: 490 /* 491 * Come here to wait for slave to open, for space 492 * in outq, or space in rawq. 493 */ 494 if (!ISSET(tp->t_state, TS_CARR_ON)) 495 return (EIO); 496 if (flag & IO_NDELAY) { 497 /* adjust for data copied in but not written */ 498 uio->uio_resid += cc; 499 if (cnt == 0) 500 return (EWOULDBLOCK); 501 return (0); 502 } 503 error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 504 ttyout, 0); 505 if (error) { 506 /* adjust for data copied in but not written */ 507 uio->uio_resid += cc; 508 return (error); 509 } 510 goto again; 511 } 512 513 int 514 ptcpoll(dev, events, p) 515 dev_t dev; 516 int events; 517 struct proc *p; 518 { 519 register struct pt_softc *pti = &pt_softc[minor(dev)]; 520 register struct tty *tp = pti->pt_tty; 521 int revents = 0; 522 int s = splsoftclock(); 523 524 if (events & (POLLIN | POLLRDNORM)) 525 if (ISSET(tp->t_state, TS_ISOPEN) && 526 ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || 527 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 528 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 529 revents |= events & (POLLIN | POLLRDNORM); 530 531 if (events & (POLLOUT | POLLWRNORM)) 532 if (ISSET(tp->t_state, TS_ISOPEN) && 533 ((pti->pt_flags & PF_REMOTE) ? 534 (tp->t_canq.c_cc == 0) : 535 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || 536 (tp->t_canq.c_cc == 0 && ISSET(tp->t_iflag, ICANON))))) 537 revents |= events & (POLLOUT | POLLWRNORM); 538 539 if (events & POLLHUP) 540 if (!ISSET(tp->t_state, TS_CARR_ON)) 541 revents |= POLLHUP; 542 543 if (revents == 0) { 544 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 545 selrecord(p, &pti->pt_selr); 546 547 if (events & (POLLOUT | POLLWRNORM)) 548 selrecord(p, &pti->pt_selw); 549 } 550 551 splx(s); 552 return (revents); 553 } 554 555 556 struct tty * 557 ptytty(dev) 558 dev_t dev; 559 { 560 register struct pt_softc *pti = &pt_softc[minor(dev)]; 561 register struct tty *tp = pti->pt_tty; 562 563 return (tp); 564 } 565 566 /*ARGSUSED*/ 567 int 568 ptyioctl(dev, cmd, data, flag, p) 569 dev_t dev; 570 u_long cmd; 571 caddr_t data; 572 int flag; 573 struct proc *p; 574 { 575 register struct pt_softc *pti = &pt_softc[minor(dev)]; 576 register struct tty *tp = pti->pt_tty; 577 register u_char *cc = tp->t_cc; 578 int stop, error; 579 580 /* 581 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 582 * ttywflush(tp) will hang if there are characters in the outq. 583 */ 584 if (cmd == TIOCEXT) { 585 /* 586 * When the EXTPROC bit is being toggled, we need 587 * to send an TIOCPKT_IOCTL if the packet driver 588 * is turned on. 589 */ 590 if (*(int *)data) { 591 if (pti->pt_flags & PF_PKT) { 592 pti->pt_send |= TIOCPKT_IOCTL; 593 ptcwakeup(tp, FREAD); 594 } 595 SET(tp->t_lflag, EXTPROC); 596 } else { 597 if (ISSET(tp->t_state, EXTPROC) && 598 (pti->pt_flags & PF_PKT)) { 599 pti->pt_send |= TIOCPKT_IOCTL; 600 ptcwakeup(tp, FREAD); 601 } 602 CLR(tp->t_lflag, EXTPROC); 603 } 604 return(0); 605 } else 606 if (cdevsw[major(dev)].d_open == ptcopen) 607 switch (cmd) { 608 609 case TIOCGPGRP: 610 #ifdef COMPAT_SUNOS 611 { 612 /* 613 * I'm not sure about SunOS TIOCGPGRP semantics 614 * on PTYs, but it's something like this: 615 */ 616 extern struct emul emul_sunos; 617 if (p->p_emul == &emul_sunos && tp->t_pgrp == 0) 618 return (EIO); 619 *(int *)data = tp->t_pgrp->pg_id; 620 return (0); 621 } 622 #endif 623 /* 624 * We avoid calling ttioctl on the controller since, 625 * in that case, tp must be the controlling terminal. 626 */ 627 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 628 return (0); 629 630 case TIOCPKT: 631 if (*(int *)data) { 632 if (pti->pt_flags & PF_UCNTL) 633 return (EINVAL); 634 pti->pt_flags |= PF_PKT; 635 } else 636 pti->pt_flags &= ~PF_PKT; 637 return (0); 638 639 case TIOCUCNTL: 640 if (*(int *)data) { 641 if (pti->pt_flags & PF_PKT) 642 return (EINVAL); 643 pti->pt_flags |= PF_UCNTL; 644 } else 645 pti->pt_flags &= ~PF_UCNTL; 646 return (0); 647 648 case TIOCREMOTE: 649 if (*(int *)data) 650 pti->pt_flags |= PF_REMOTE; 651 else 652 pti->pt_flags &= ~PF_REMOTE; 653 ttyflush(tp, FREAD|FWRITE); 654 return (0); 655 656 #ifdef COMPAT_OLDTTY 657 case TIOCSETP: 658 case TIOCSETN: 659 #endif 660 case TIOCSETD: 661 case TIOCSETA: 662 case TIOCSETAW: 663 case TIOCSETAF: 664 ndflush(&tp->t_outq, tp->t_outq.c_cc); 665 break; 666 667 case TIOCSIG: 668 if (*(unsigned int *)data >= NSIG) 669 return(EINVAL); 670 if (!ISSET(tp->t_lflag, NOFLSH)) 671 ttyflush(tp, FREAD|FWRITE); 672 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 673 if ((*(unsigned int *)data == SIGINFO) && 674 (!ISSET(tp->t_lflag, NOKERNINFO))) 675 ttyinfo(tp); 676 return(0); 677 } 678 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 679 if (error < 0) 680 error = ttioctl(tp, cmd, data, flag, p); 681 if (error < 0) { 682 if (pti->pt_flags & PF_UCNTL && 683 (cmd & ~0xff) == UIOCCMD(0)) { 684 if (cmd & 0xff) { 685 pti->pt_ucntl = (u_char)cmd; 686 ptcwakeup(tp, FREAD); 687 } 688 return (0); 689 } 690 error = ENOTTY; 691 } 692 /* 693 * If external processing and packet mode send ioctl packet. 694 */ 695 if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { 696 switch(cmd) { 697 case TIOCSETA: 698 case TIOCSETAW: 699 case TIOCSETAF: 700 #ifdef COMPAT_OLDTTY 701 case TIOCSETP: 702 case TIOCSETN: 703 case TIOCSETC: 704 case TIOCSLTC: 705 case TIOCLBIS: 706 case TIOCLBIC: 707 case TIOCLSET: 708 #endif 709 pti->pt_send |= TIOCPKT_IOCTL; 710 ptcwakeup(tp, FREAD); 711 default: 712 break; 713 } 714 } 715 stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) 716 && CCEQ(cc[VSTART], CTRL('q')); 717 if (pti->pt_flags & PF_NOSTOP) { 718 if (stop) { 719 pti->pt_send &= ~TIOCPKT_NOSTOP; 720 pti->pt_send |= TIOCPKT_DOSTOP; 721 pti->pt_flags &= ~PF_NOSTOP; 722 ptcwakeup(tp, FREAD); 723 } 724 } else { 725 if (!stop) { 726 pti->pt_send &= ~TIOCPKT_DOSTOP; 727 pti->pt_send |= TIOCPKT_NOSTOP; 728 pti->pt_flags |= PF_NOSTOP; 729 ptcwakeup(tp, FREAD); 730 } 731 } 732 return (error); 733 } 734
Indexes created Wed Sep 24 05:09:52 GMT 2025