tty_pty.c revision 1.12.2.6
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 1.12.2.6 1993/11/14 21:18:04 mycroft Exp $ 35 */ 36 37 /* 38 * Pseudo-teletype Driver 39 * (Actually two drivers, requiring two entries in 'cdevsw') 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/ioctl.h> 45 #include <sys/select.h> 46 #include <sys/tty.h> 47 #include <sys/conf.h> 48 #include <sys/file.h> 49 #include <sys/proc.h> 50 #include <sys/uio.h> 51 #include <sys/kernel.h> 52 #include <sys/vnode.h> 53 54 #include <machine/cpu.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 void 87 ptyattach(n) 88 int n; 89 { 90 } 91 92 /*ARGSUSED*/ 93 int 94 ptsopen(dev, flag, devtype, p) 95 dev_t dev; 96 int flag, devtype; 97 struct proc *p; 98 { 99 register struct tty *tp; 100 int error; 101 102 #ifdef lint 103 npty = npty; 104 #endif 105 if (minor(dev) >= NPTY) 106 return (ENXIO); 107 if(!pt_tty[minor(dev)]) { 108 tp = pt_tty[minor(dev)] = ttymalloc(); 109 } else 110 tp = pt_tty[minor(dev)]; 111 if ((tp->t_state & TS_ISOPEN) == 0) { 112 tp->t_state |= TS_WOPEN; 113 ttychars(tp); /* Set up default chars */ 114 tp->t_iflag = TTYDEF_IFLAG; 115 tp->t_oflag = TTYDEF_OFLAG; 116 tp->t_lflag = TTYDEF_LFLAG; 117 tp->t_cflag = TTYDEF_CFLAG; 118 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 119 ttsetwater(tp); /* would be done in xxparam() */ 120 } else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0) 121 return (EBUSY); 122 if (tp->t_oproc) /* Ctrlr still around. */ 123 tp->t_state |= TS_CARR_ON; 124 while ((tp->t_state & TS_CARR_ON) == 0) { 125 tp->t_state |= TS_WOPEN; 126 if (flag&FNONBLOCK) 127 break; 128 if (error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH, 129 ttopen, 0)) 130 return (error); 131 } 132 if (error = (*linesw[tp->t_line].l_open)(dev, tp)) 133 return (error); 134 pt_ioctl[minor(dev)].pt_flags |= PF_SOPEN; 135 ptcwakeup(tp, FREAD|FWRITE); 136 return (0); 137 } 138 139 int 140 ptsclose(dev, flag, mode, p) 141 dev_t dev; 142 int flag, mode; 143 struct proc *p; 144 { 145 register struct tty *tp; 146 147 tp = pt_tty[minor(dev)]; 148 (*linesw[tp->t_line].l_close)(tp, flag); 149 ttyclose(tp); 150 ptcwakeup(tp, FREAD|FWRITE); 151 pt_ioctl[minor(dev)].pt_flags &= ~PF_SOPEN; 152 #ifdef notyet /* XXXX */ 153 if ((pt_ioctl[minor(dev)].pt_flags & PF_COPEN) == 0) { 154 ttyfree(tp); 155 pt_tty[minor(dev)] = (struct tty *)NULL; 156 } 157 #endif 158 return(0); 159 } 160 161 int 162 ptsread(dev, uio, flag) 163 dev_t dev; 164 struct uio *uio; 165 int flag; 166 { 167 struct proc *p = curproc; 168 register struct tty *tp = pt_tty[minor(dev)]; 169 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 170 int error = 0; 171 172 again: 173 if (pti->pt_flags & PF_REMOTE) { 174 while (isbackground(p, tp)) { 175 if ((p->p_sigignore & sigmask(SIGTTIN)) || 176 (p->p_sigmask & sigmask(SIGTTIN)) || 177 p->p_pgrp->pg_jobc == 0 || 178 p->p_flag&SPPWAIT) 179 return (EIO); 180 pgsignal(p->p_pgrp, SIGTTIN, 1); 181 if (error = ttysleep(tp, (caddr_t)&lbolt, 182 TTIPRI | PCATCH, ttybg, 0)) 183 return (error); 184 } 185 if (tp->t_canq.c_cc == 0) { 186 if (flag & IO_NDELAY) 187 return (EWOULDBLOCK); 188 if (error = ttysleep(tp, (caddr_t)&tp->t_canq, 189 TTIPRI | PCATCH, ttyin, 0)) 190 return (error); 191 goto again; 192 } 193 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 194 if (ureadc(getc(&tp->t_canq), uio) < 0) { 195 error = EFAULT; 196 break; 197 } 198 if (tp->t_canq.c_cc == 1) 199 (void) getc(&tp->t_canq); 200 if (tp->t_canq.c_cc) 201 return (error); 202 } else 203 if (tp->t_oproc) 204 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 205 ptcwakeup(tp, FWRITE); 206 return (error); 207 } 208 209 /* 210 * Write to pseudo-tty. 211 * Wakeups of controlling tty will happen 212 * indirectly, when tty driver calls ptsstart. 213 */ 214 int 215 ptswrite(dev, uio, flag) 216 dev_t dev; 217 struct uio *uio; 218 int flag; 219 { 220 register struct tty *tp; 221 222 tp = pt_tty[minor(dev)]; 223 if (tp->t_oproc == 0) 224 return (EIO); 225 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 226 } 227 228 /* 229 * Start output on pseudo-tty. 230 * Wake up process selecting or sleeping for input from controlling tty. 231 */ 232 void 233 ptsstart(tp) 234 struct tty *tp; 235 { 236 register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 237 238 if (tp->t_state & TS_TTSTOP) 239 return; 240 if (pti->pt_flags & PF_STOPPED) { 241 pti->pt_flags &= ~PF_STOPPED; 242 pti->pt_send = TIOCPKT_START; 243 } 244 ptcwakeup(tp, FREAD); 245 return; 246 } 247 248 void 249 ptcwakeup(tp, flag) 250 struct tty *tp; 251 int flag; 252 { 253 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 254 255 if (flag & FREAD) { 256 selwakeup(&pti->pt_selr); 257 wakeup((caddr_t)&tp->t_outq.c_cl); 258 } 259 if (flag & FWRITE) { 260 selwakeup(&pti->pt_selw); 261 wakeup((caddr_t)&tp->t_rawq.c_cf); 262 } 263 } 264 265 /*ARGSUSED*/ 266 #ifdef __STDC__ 267 int 268 ptcopen(dev_t dev, int flag, int devtype, struct proc *p) 269 #else 270 int 271 ptcopen(dev, flag, devtype, p) 272 dev_t dev; 273 int flag, devtype; 274 struct proc *p; 275 #endif 276 { 277 register struct tty *tp; 278 struct pt_ioctl *pti; 279 280 if (minor(dev) >= NPTY) 281 return (ENXIO); 282 if(!pt_tty[minor(dev)]) { 283 tp = pt_tty[minor(dev)] = ttymalloc(); 284 } else 285 tp = pt_tty[minor(dev)]; 286 if (tp->t_oproc) 287 return (EIO); 288 tp->t_oproc = ptsstart; 289 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 290 tp->t_lflag &= ~EXTPROC; 291 pti = &pt_ioctl[minor(dev)]; 292 pti->pt_flags &= PF_SOPEN; 293 pti->pt_flags |= PF_COPEN; 294 pti->pt_send = 0; 295 pti->pt_ucntl = 0; 296 return (0); 297 } 298 299 extern struct tty *constty; /* -hv- 06.Oct.92*/ 300 301 int 302 ptcclose(dev) 303 dev_t dev; 304 { 305 register struct tty *tp; 306 307 tp = pt_tty[minor(dev)]; 308 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 309 tp->t_state &= ~TS_CARR_ON; 310 tp->t_oproc = 0; /* mark closed */ 311 312 /* XXX -hv- 6.Oct.92 this prevents the "hanging console bug" with X11 */ 313 if (constty==tp) 314 constty = 0; 315 316 pt_ioctl[minor(dev)].pt_flags &= ~PF_COPEN; 317 if ((pt_ioctl[minor(dev)].pt_flags & PF_SOPEN) == 0) { 318 ttyfree(tp); 319 pt_tty[minor(dev)] = (struct tty *)NULL; 320 } 321 return (0); 322 } 323 324 int 325 ptcread(dev, uio, flag) 326 dev_t dev; 327 struct uio *uio; 328 int flag; 329 { 330 register struct tty *tp = pt_tty[minor(dev)]; 331 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 332 u_char buf[BUFSIZ]; 333 int error = 0, cc; 334 335 /* 336 * We want to block until the slave 337 * is open, and there's something to read; 338 * but if we lost the slave or we're NBIO, 339 * then return the appropriate error instead. 340 */ 341 for (;;) { 342 if (tp->t_state&TS_ISOPEN) { 343 if (pti->pt_flags&PF_PKT && pti->pt_send) { 344 error = ureadc((int)pti->pt_send, uio); 345 if (error) 346 return (error); 347 if (pti->pt_send & TIOCPKT_IOCTL) { 348 cc = MIN(uio->uio_resid, 349 sizeof(tp->t_termios)); 350 uiomove((caddr_t)&tp->t_termios, cc, 351 uio); 352 } 353 pti->pt_send = 0; 354 return (0); 355 } 356 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 357 error = ureadc((int)pti->pt_ucntl, uio); 358 if (error) 359 return (error); 360 pti->pt_ucntl = 0; 361 return (0); 362 } 363 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 364 break; 365 } 366 if ((tp->t_state&TS_CARR_ON) == 0) 367 return (0); /* EOF */ 368 if (flag & IO_NDELAY) 369 return (EWOULDBLOCK); 370 if (error = tsleep((caddr_t)&tp->t_outq.c_cl, TTIPRI | PCATCH, 371 ttyin, 0)) 372 return (error); 373 } 374 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 375 error = ureadc(0, uio); 376 while (uio->uio_resid > 0 && error == 0) { 377 cc = q_to_b(&tp->t_outq, buf, MIN(uio->uio_resid, BUFSIZ)); 378 if (cc <= 0) 379 break; 380 error = uiomove(buf, cc, uio); 381 } 382 if (tp->t_outq.c_cc <= tp->t_lowat) { 383 if (tp->t_state&TS_ASLEEP) { 384 tp->t_state &= ~TS_ASLEEP; 385 wakeup((caddr_t)&tp->t_outq); 386 } 387 selwakeup(&tp->t_wsel); 388 } 389 return (error); 390 } 391 392 void 393 ptsstop(tp, flush) 394 register struct tty *tp; 395 int flush; 396 { 397 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 398 int flag; 399 400 /* note: FLUSHREAD and FLUSHWRITE already ok */ 401 if (flush == 0) { 402 flush = TIOCPKT_STOP; 403 pti->pt_flags |= PF_STOPPED; 404 } else 405 pti->pt_flags &= ~PF_STOPPED; 406 pti->pt_send |= flush; 407 /* change of perspective */ 408 flag = 0; 409 if (flush & FREAD) 410 flag |= FWRITE; 411 if (flush & FWRITE) 412 flag |= FREAD; 413 ptcwakeup(tp, flag); 414 } 415 416 int 417 ptcselect(dev, rw, p) 418 dev_t dev; 419 int rw; 420 struct proc *p; 421 { 422 register struct tty *tp = pt_tty[minor(dev)]; 423 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 424 int s; 425 426 if ((tp->t_state&TS_CARR_ON) == 0) 427 return (1); 428 switch (rw) { 429 430 case FREAD: 431 /* 432 * Need to block timeouts (ttrstart). 433 */ 434 s = spltty(); 435 if ((tp->t_state&TS_ISOPEN) && 436 tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) { 437 splx(s); 438 return (1); 439 } 440 splx(s); 441 /* FALLTHROUGH */ 442 443 case 0: /* exceptional */ 444 if ((tp->t_state&TS_ISOPEN) && 445 (pti->pt_flags&PF_PKT && pti->pt_send || 446 pti->pt_flags&PF_UCNTL && pti->pt_ucntl)) 447 return (1); 448 selrecord(p, &pti->pt_selr); 449 break; 450 451 452 case FWRITE: 453 if (tp->t_state&TS_ISOPEN) { 454 if (pti->pt_flags & PF_REMOTE) { 455 if (tp->t_canq.c_cc == 0) 456 return (1); 457 } else { 458 if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) 459 return (1); 460 if (tp->t_canq.c_cc == 0 && (tp->t_iflag&ICANON)) 461 return (1); 462 } 463 } 464 selrecord(p, &pti->pt_selw); 465 break; 466 467 } 468 return (0); 469 } 470 471 int 472 ptcwrite(dev, uio, flag) 473 dev_t dev; 474 register struct uio *uio; 475 int flag; 476 { 477 register struct tty *tp = pt_tty[minor(dev)]; 478 register u_char *cp; 479 register int cc = 0; 480 u_char locbuf[BUFSIZ]; 481 int cnt = 0; 482 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 483 int error = 0; 484 485 again: 486 if ((tp->t_state&TS_ISOPEN) == 0) 487 goto block; 488 if (pti->pt_flags & PF_REMOTE) { 489 if (tp->t_canq.c_cc) 490 goto block; 491 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 492 if (cc == 0) { 493 cc = min(uio->uio_resid, BUFSIZ); 494 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 495 cp = locbuf; 496 error = uiomove((caddr_t)cp, cc, uio); 497 if (error) 498 return (error); 499 /* check again for safety */ 500 if ((tp->t_state&TS_ISOPEN) == 0) 501 return (EIO); 502 } 503 if (cc) 504 (void) b_to_q(cp, cc, &tp->t_canq); 505 cc = 0; 506 } 507 (void) putc(0, &tp->t_canq); 508 ttwakeup(tp); 509 wakeup((caddr_t)&tp->t_canq); 510 return (0); 511 } 512 while (uio->uio_resid > 0) { 513 if (cc == 0) { 514 cc = min(uio->uio_resid, BUFSIZ); 515 cp = locbuf; 516 error = uiomove((caddr_t)cp, cc, uio); 517 if (error) 518 return (error); 519 /* check again for safety */ 520 if ((tp->t_state&TS_ISOPEN) == 0) 521 return (EIO); 522 } 523 while (cc > 0) { 524 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 525 (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 526 wakeup((caddr_t)&tp->t_rawq); 527 goto block; 528 } 529 (*linesw[tp->t_line].l_rint)(*cp++, tp); 530 cnt++; 531 cc--; 532 } 533 cc = 0; 534 } 535 return (0); 536 block: 537 /* 538 * Come here to wait for slave to open, for space 539 * in outq, or space in rawq. 540 */ 541 if ((tp->t_state&TS_CARR_ON) == 0) 542 return (EIO); 543 if (flag & IO_NDELAY) { 544 /* adjust for data copied in but not written */ 545 uio->uio_resid += cc; 546 if (cnt == 0) 547 return (EWOULDBLOCK); 548 return (0); 549 } 550 if (error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 551 ttyout, 0)) { 552 /* adjust for data copied in but not written */ 553 uio->uio_resid += cc; 554 return (error); 555 } 556 goto again; 557 } 558 559 /*ARGSUSED*/ 560 int 561 ptyioctl(dev, cmd, data, flag) 562 caddr_t data; 563 int cmd, flag; 564 dev_t dev; 565 { 566 register struct tty *tp = pt_tty[minor(dev)]; 567 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 568 register u_char *cc = tp->t_cc; 569 int stop, error; 570 571 /* 572 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 573 * ttywflush(tp) will hang if there are characters in the outq. 574 */ 575 if (cmd == TIOCEXT) { 576 /* 577 * When the EXTPROC bit is being toggled, we need 578 * to send an TIOCPKT_IOCTL if the packet driver 579 * is turned on. 580 */ 581 if (*(int *)data) { 582 if (pti->pt_flags & PF_PKT) { 583 pti->pt_send |= TIOCPKT_IOCTL; 584 ptcwakeup(tp, FREAD); 585 } 586 tp->t_lflag |= EXTPROC; 587 } else { 588 if ((tp->t_state & EXTPROC) && 589 (pti->pt_flags & PF_PKT)) { 590 pti->pt_send |= TIOCPKT_IOCTL; 591 ptcwakeup(tp, FREAD); 592 } 593 tp->t_lflag &= ~EXTPROC; 594 } 595 return(0); 596 } else 597 if (cdevsw[major(dev)].d_open == ptcopen) 598 switch (cmd) { 599 600 case TIOCGPGRP: 601 /* 602 * We aviod calling ttioctl on the controller since, 603 * in that case, tp must be the controlling terminal. 604 */ 605 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 606 return (0); 607 608 case TIOCPKT: 609 if (*(int *)data) { 610 if (pti->pt_flags & PF_UCNTL) 611 return (EINVAL); 612 pti->pt_flags |= PF_PKT; 613 } else 614 pti->pt_flags &= ~PF_PKT; 615 return (0); 616 617 case TIOCUCNTL: 618 if (*(int *)data) { 619 if (pti->pt_flags & PF_PKT) 620 return (EINVAL); 621 pti->pt_flags |= PF_UCNTL; 622 } else 623 pti->pt_flags &= ~PF_UCNTL; 624 return (0); 625 626 case TIOCREMOTE: 627 if (*(int *)data) 628 pti->pt_flags |= PF_REMOTE; 629 else 630 pti->pt_flags &= ~PF_REMOTE; 631 ttyflush(tp, FREAD|FWRITE); 632 return (0); 633 634 #ifdef COMPAT_43 635 /* wkt */ 636 case TIOCSETP: 637 case TIOCSETN: 638 #endif 639 case TIOCSETD: 640 case TIOCSETA: 641 case TIOCSETAW: 642 case TIOCSETAF: 643 flushq(&tp->t_outq); 644 break; 645 646 case TIOCSIG: 647 if (*(unsigned int *)data >= NSIG) 648 return(EINVAL); 649 if ((tp->t_lflag&NOFLSH) == 0) 650 ttyflush(tp, FREAD|FWRITE); 651 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 652 if ((*(unsigned int *)data == SIGINFO) && 653 ((tp->t_lflag&NOKERNINFO) == 0)) 654 ttyinfo(tp); 655 return(0); 656 } 657 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag); 658 if (error < 0) 659 error = ttioctl(tp, cmd, data, flag); 660 /* 661 * Since we use the tty queues internally, 662 * pty's can't be switched to disciplines which overwrite 663 * the queues. We can't tell anything about the discipline 664 * from here... 665 */ 666 if (linesw[tp->t_line].l_rint != ttyinput) { 667 (*linesw[tp->t_line].l_close)(tp, flag); 668 tp->t_line = TTYDISC; 669 (void)(*linesw[tp->t_line].l_open)(dev, tp); 670 error = ENOTTY; 671 } 672 if (error < 0) { 673 if (pti->pt_flags & PF_UCNTL && 674 (cmd & ~0xff) == UIOCCMD(0)) { 675 if (cmd & 0xff) { 676 pti->pt_ucntl = (u_char)cmd; 677 ptcwakeup(tp, FREAD); 678 } 679 return (0); 680 } 681 error = ENOTTY; 682 } 683 /* 684 * If external processing and packet mode send ioctl packet. 685 */ 686 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 687 switch(cmd) { 688 case TIOCSETA: 689 case TIOCSETAW: 690 case TIOCSETAF: 691 #ifdef COMPAT_43 692 /* wkt */ 693 case TIOCSETP: 694 case TIOCSETN: 695 case TIOCSETC: 696 case TIOCSLTC: 697 case TIOCLBIS: 698 case TIOCLBIC: 699 case TIOCLSET: 700 #endif 701 pti->pt_send |= TIOCPKT_IOCTL; 702 default: 703 break; 704 } 705 } 706 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 707 && CCEQ(cc[VSTART], CTRL('q')); 708 if (pti->pt_flags & PF_NOSTOP) { 709 if (stop) { 710 pti->pt_send &= ~TIOCPKT_NOSTOP; 711 pti->pt_send |= TIOCPKT_DOSTOP; 712 pti->pt_flags &= ~PF_NOSTOP; 713 ptcwakeup(tp, FREAD); 714 } 715 } else { 716 if (!stop) { 717 pti->pt_send &= ~TIOCPKT_DOSTOP; 718 pti->pt_send |= TIOCPKT_NOSTOP; 719 pti->pt_flags |= PF_NOSTOP; 720 ptcwakeup(tp, FREAD); 721 } 722 } 723 return (error); 724 } 725
Indexes created Tue Sep 30 20:09:53 GMT 2025