tty_pty.c revision 1.7
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 1.7 1993/06/27 06:06:47 andrew Exp $ 35 */ 36 37 /* 38 * Pseudo-teletype Driver 39 * (Actually two drivers, requiring two entries in 'cdevsw') 40 */ 41 #include "pty.h" 42 43 #if NPTY > 0 44 #include "param.h" 45 #include "systm.h" 46 #include "ioctl.h" 47 #include "select.h" 48 #include "tty.h" 49 #include "conf.h" 50 #include "file.h" 51 #include "malloc.h" 52 #include "proc.h" 53 #include "uio.h" 54 #include "kernel.h" 55 #include "vnode.h" 56 57 #if NPTY == 1 58 #undef NPTY 59 #define NPTY 32 /* crude XXX */ 60 #endif 61 62 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 63 64 /* 65 * pts == /dev/tty[pqrs]? 66 * ptc == /dev/pty[pqrs]? 67 */ 68 struct tty *pt_tty[NPTY]; 69 struct pt_ioctl { 70 int pt_flags; 71 struct selinfo pt_selr, pt_selw; 72 u_char pt_send; 73 u_char pt_ucntl; 74 } pt_ioctl[NPTY]; 75 int npty = NPTY; /* for pstat -t */ 76 77 #define PF_RCOLL 0x01 78 #define PF_WCOLL 0x02 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 ptcwakeup __P((struct tty *tp, int flag)); 86 87 /*ARGSUSED*/ 88 int 89 ptsopen(dev, flag, devtype, p) 90 dev_t dev; 91 int flag, devtype; 92 struct proc *p; 93 { 94 register struct tty *tp; 95 int error; 96 97 #ifdef lint 98 npty = npty; 99 #endif 100 if (minor(dev) >= NPTY) 101 return (ENXIO); 102 if(!pt_tty[minor(dev)]) { 103 MALLOC(tp, struct tty *, sizeof(struct tty), M_TTYS, M_WAITOK); 104 bzero(tp, sizeof(struct tty)); 105 pt_tty[minor(dev)] = tp; 106 } else 107 tp = pt_tty[minor(dev)]; 108 if ((tp->t_state & TS_ISOPEN) == 0) { 109 tp->t_state |= TS_WOPEN; 110 ttychars(tp); /* Set up default chars */ 111 tp->t_iflag = TTYDEF_IFLAG; 112 tp->t_oflag = TTYDEF_OFLAG; 113 tp->t_lflag = TTYDEF_LFLAG; 114 tp->t_cflag = TTYDEF_CFLAG; 115 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 116 ttsetwater(tp); /* would be done in xxparam() */ 117 } else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0) 118 return (EBUSY); 119 if (tp->t_oproc) /* Ctrlr still around. */ 120 tp->t_state |= TS_CARR_ON; 121 while ((tp->t_state & TS_CARR_ON) == 0) { 122 tp->t_state |= TS_WOPEN; 123 if (flag&FNONBLOCK) 124 break; 125 if (error = ttysleep(tp, (caddr_t)&tp->t_raw, TTIPRI | PCATCH, 126 ttopen, 0)) 127 return (error); 128 } 129 error = (*linesw[tp->t_line].l_open)(dev, tp); 130 ptcwakeup(tp, FREAD|FWRITE); 131 return (error); 132 } 133 134 int 135 ptsclose(dev, flag, mode, p) 136 dev_t dev; 137 int flag, mode; 138 struct proc *p; 139 { 140 register struct tty *tp; 141 142 tp = pt_tty[minor(dev)]; 143 (*linesw[tp->t_line].l_close)(tp, flag); 144 ttyclose(tp); 145 ptcwakeup(tp, FREAD|FWRITE); 146 return(0); 147 } 148 149 int 150 ptsread(dev, uio, flag) 151 dev_t dev; 152 struct uio *uio; 153 int flag; 154 { 155 struct proc *p = curproc; 156 register struct tty *tp = pt_tty[minor(dev)]; 157 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 158 int error = 0; 159 160 again: 161 if (pti->pt_flags & PF_REMOTE) { 162 while (isbackground(p, tp)) { 163 if ((p->p_sigignore & sigmask(SIGTTIN)) || 164 (p->p_sigmask & sigmask(SIGTTIN)) || 165 p->p_pgrp->pg_jobc == 0 || 166 p->p_flag&SPPWAIT) 167 return (EIO); 168 pgsignal(p->p_pgrp, SIGTTIN, 1); 169 if (error = ttysleep(tp, (caddr_t)&lbolt, 170 TTIPRI | PCATCH, ttybg, 0)) 171 return (error); 172 } 173 if (RB_LEN(&tp->t_can) == 0) { 174 if (flag & IO_NDELAY) 175 return (EWOULDBLOCK); 176 if (error = ttysleep(tp, (caddr_t)&tp->t_can, 177 TTIPRI | PCATCH, ttyin, 0)) 178 return (error); 179 goto again; 180 } 181 while (RB_LEN(&tp->t_can) > 1 && uio->uio_resid > 0) 182 if (ureadc(rbgetc(&tp->t_can), uio) < 0) { 183 error = EFAULT; 184 break; 185 } 186 if (RB_LEN(&tp->t_can) == 1) 187 (void) rbgetc(&tp->t_can); 188 if (RB_LEN(&tp->t_can)) 189 return (error); 190 } else 191 if (tp->t_oproc) 192 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 193 ptcwakeup(tp, FWRITE); 194 return (error); 195 } 196 197 /* 198 * Write to pseudo-tty. 199 * Wakeups of controlling tty will happen 200 * indirectly, when tty driver calls ptsstart. 201 */ 202 int 203 ptswrite(dev, uio, flag) 204 dev_t dev; 205 struct uio *uio; 206 int flag; 207 { 208 register struct tty *tp; 209 210 tp = pt_tty[minor(dev)]; 211 if (tp->t_oproc == 0) 212 return (EIO); 213 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 214 } 215 216 /* 217 * Start output on pseudo-tty. 218 * Wake up process selecting or sleeping for input from controlling tty. 219 */ 220 int 221 ptsstart(tp) 222 struct tty *tp; 223 { 224 register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 225 226 if (tp->t_state & TS_TTSTOP) 227 return 0; /* XXX should we return 1? */ 228 if (pti->pt_flags & PF_STOPPED) { 229 pti->pt_flags &= ~PF_STOPPED; 230 pti->pt_send = TIOCPKT_START; 231 } 232 ptcwakeup(tp, FREAD); 233 234 return 0; 235 } 236 237 void 238 ptcwakeup(tp, flag) 239 struct tty *tp; 240 int flag; 241 { 242 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 243 244 if (flag & FREAD) { 245 selwakeup(&pti->pt_selr); 246 wakeup((caddr_t)&tp->t_out.rb_tl); 247 } 248 if (flag & FWRITE) { 249 selwakeup(&pti->pt_selw); 250 wakeup((caddr_t)&tp->t_raw.rb_hd); 251 } 252 } 253 254 /*ARGSUSED*/ 255 #ifdef __STDC__ 256 int 257 ptcopen(dev_t dev, int flag, int devtype, struct proc *p) 258 #else 259 int 260 ptcopen(dev, flag, devtype, p) 261 dev_t dev; 262 int flag, devtype; 263 struct proc *p; 264 #endif 265 { 266 register struct tty *tp; 267 struct pt_ioctl *pti; 268 269 if (minor(dev) >= NPTY) 270 return (ENXIO); 271 if(!pt_tty[minor(dev)]) { 272 MALLOC(tp, struct tty *, sizeof(struct tty), M_TTYS, M_WAITOK); 273 bzero(tp, sizeof(struct tty)); 274 pt_tty[minor(dev)] = tp; 275 } else 276 tp = pt_tty[minor(dev)]; 277 if (tp->t_oproc) 278 return (EIO); 279 tp->t_oproc = ptsstart; 280 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 281 tp->t_lflag &= ~EXTPROC; 282 pti = &pt_ioctl[minor(dev)]; 283 pti->pt_flags = 0; 284 pti->pt_send = 0; 285 pti->pt_ucntl = 0; 286 return (0); 287 } 288 289 extern struct tty *constty; /* -hv- 06.Oct.92*/ 290 291 int 292 ptcclose(dev) 293 dev_t dev; 294 { 295 register struct tty *tp; 296 297 tp = pt_tty[minor(dev)]; 298 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 299 tp->t_state &= ~TS_CARR_ON; 300 tp->t_oproc = 0; /* mark closed */ 301 tp->t_session = 0; 302 303 /* XXX -hv- 6.Oct.92 this prevents the "hanging console bug" with X11 */ 304 if (constty==tp) 305 constty = 0; 306 307 #if 0 308 /* 309 * currently, we do not free the pty structures once they have 310 * been allocated. Two reasons: cheap to keep them around, and 311 * I don't want to spend my time finding the exact variables that 312 * will tell me if the slave/master are closed and if I can free 313 * them. <deraadt (at) fsa.ca> 314 */ 315 FREE(tp, M_TTYS); 316 pt_tty[minor(dev)] = (struct tty *)NULL; 317 #endif 318 return (0); 319 } 320 321 int 322 ptcread(dev, uio, flag) 323 dev_t dev; 324 struct uio *uio; 325 int flag; 326 { 327 register struct tty *tp = pt_tty[minor(dev)]; 328 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 329 char buf[BUFSIZ]; 330 int error = 0, cc; 331 332 /* 333 * We want to block until the slave 334 * is open, and there's something to read; 335 * but if we lost the slave or we're NBIO, 336 * then return the appropriate error instead. 337 */ 338 for (;;) { 339 if (tp->t_state&TS_ISOPEN) { 340 if (pti->pt_flags&PF_PKT && pti->pt_send) { 341 error = ureadc((int)pti->pt_send, uio); 342 if (error) 343 return (error); 344 if (pti->pt_send & TIOCPKT_IOCTL) { 345 cc = MIN(uio->uio_resid, 346 sizeof(tp->t_termios)); 347 uiomove((caddr_t)&tp->t_termios, cc, 348 uio); 349 } 350 pti->pt_send = 0; 351 return (0); 352 } 353 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 354 error = ureadc((int)pti->pt_ucntl, uio); 355 if (error) 356 return (error); 357 pti->pt_ucntl = 0; 358 return (0); 359 } 360 if (RB_LEN(&tp->t_out) && (tp->t_state&TS_TTSTOP) == 0) 361 break; 362 } 363 if ((tp->t_state&TS_CARR_ON) == 0) 364 return (0); /* EOF */ 365 if (flag & IO_NDELAY) 366 return (EWOULDBLOCK); 367 if (error = tsleep((caddr_t)&tp->t_out.rb_tl, TTIPRI | PCATCH, 368 ttyin, 0)) 369 return (error); 370 } 371 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 372 error = ureadc(0, uio); 373 while (uio->uio_resid > 0 && error == 0) { 374 #ifdef was 375 cc = q_to_b(&tp->t_outq, buf, MIN(uio->uio_resid, BUFSIZ)); 376 #else 377 cc = min(MIN(uio->uio_resid, BUFSIZ), RB_CONTIGGET(&tp->t_out)); 378 if (cc) { 379 rbunpack(tp->t_out.rb_hd, buf, cc); 380 tp->t_out.rb_hd = 381 RB_ROLLOVER(&tp->t_out, tp->t_out.rb_hd+cc); 382 } 383 #endif 384 if (cc <= 0) 385 break; 386 error = uiomove(buf, cc, uio); 387 } 388 if (RB_LEN(&tp->t_out) <= tp->t_lowat) { 389 if (tp->t_state&TS_ASLEEP) { 390 tp->t_state &= ~TS_ASLEEP; 391 wakeup((caddr_t)&tp->t_out); 392 } 393 selwakeup(&tp->t_wsel); 394 } 395 return (error); 396 } 397 398 void 399 ptsstop(tp, flush) 400 register struct tty *tp; 401 int flush; 402 { 403 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 404 int flag; 405 406 /* note: FLUSHREAD and FLUSHWRITE already ok */ 407 if (flush == 0) { 408 flush = TIOCPKT_STOP; 409 pti->pt_flags |= PF_STOPPED; 410 } else 411 pti->pt_flags &= ~PF_STOPPED; 412 pti->pt_send |= flush; 413 /* change of perspective */ 414 flag = 0; 415 if (flush & FREAD) 416 flag |= FWRITE; 417 if (flush & FWRITE) 418 flag |= FREAD; 419 ptcwakeup(tp, flag); 420 } 421 422 int 423 ptcselect(dev, rw, p) 424 dev_t dev; 425 int rw; 426 struct proc *p; 427 { 428 register struct tty *tp = pt_tty[minor(dev)]; 429 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 430 int s; 431 432 if ((tp->t_state&TS_CARR_ON) == 0) 433 return (1); 434 switch (rw) { 435 436 case FREAD: 437 /* 438 * Need to block timeouts (ttrstart). 439 */ 440 s = spltty(); 441 if ((tp->t_state&TS_ISOPEN) && 442 RB_LEN(&tp->t_out) && (tp->t_state&TS_TTSTOP) == 0) { 443 splx(s); 444 return (1); 445 } 446 splx(s); 447 /* FALLTHROUGH */ 448 449 case 0: /* exceptional */ 450 if ((tp->t_state&TS_ISOPEN) && 451 (pti->pt_flags&PF_PKT && pti->pt_send || 452 pti->pt_flags&PF_UCNTL && pti->pt_ucntl)) 453 return (1); 454 selrecord(p, &pti->pt_selr); 455 break; 456 457 458 case FWRITE: 459 if (tp->t_state&TS_ISOPEN) { 460 if (pti->pt_flags & PF_REMOTE) { 461 if (RB_LEN(&tp->t_can) == 0) 462 return (1); 463 } else { 464 if (RB_LEN(&tp->t_raw) + RB_LEN(&tp->t_can) < TTYHOG-2) 465 return (1); 466 if (RB_LEN(&tp->t_can) == 0 && (tp->t_iflag&ICANON)) 467 return (1); 468 } 469 } 470 selrecord(p, &pti->pt_selw); 471 break; 472 473 } 474 return (0); 475 } 476 477 int 478 ptcwrite(dev, uio, flag) 479 dev_t dev; 480 register struct uio *uio; 481 int flag; 482 { 483 register struct tty *tp = pt_tty[minor(dev)]; 484 register u_char *cp; 485 register int cc = 0; 486 u_char locbuf[BUFSIZ]; 487 int cnt = 0; 488 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 489 int error = 0; 490 491 again: 492 if ((tp->t_state&TS_ISOPEN) == 0) 493 goto block; 494 if (pti->pt_flags & PF_REMOTE) { 495 if (RB_LEN(&tp->t_can)) 496 goto block; 497 while (uio->uio_resid > 0 && RB_LEN(&tp->t_can) < TTYHOG - 1) { 498 if (cc == 0) { 499 cc = min(uio->uio_resid, BUFSIZ); 500 cc = min(cc, TTYHOG - 1 - RB_CONTIGPUT(&tp->t_can)); 501 cp = locbuf; 502 error = uiomove((caddr_t)cp, cc, uio); 503 if (error) 504 return (error); 505 /* check again for safety */ 506 if ((tp->t_state&TS_ISOPEN) == 0) 507 return (EIO); 508 } 509 #ifdef was 510 if (cc) 511 (void) b_to_q((char *)cp, cc, &tp->t_canq); 512 #else 513 if (cc) { 514 rbpack(cp, tp->t_can.rb_tl, cc); 515 tp->t_can.rb_tl = 516 RB_ROLLOVER(&tp->t_can, tp->t_can.rb_tl+cc); 517 } 518 #endif 519 cc = 0; 520 } 521 (void) putc(0, &tp->t_can); 522 ttwakeup(tp); 523 wakeup((caddr_t)&tp->t_can); 524 return (0); 525 } 526 while (uio->uio_resid > 0) { 527 if (cc == 0) { 528 cc = min(uio->uio_resid, BUFSIZ); 529 cp = locbuf; 530 error = uiomove((caddr_t)cp, cc, uio); 531 if (error) 532 return (error); 533 /* check again for safety */ 534 if ((tp->t_state&TS_ISOPEN) == 0) 535 return (EIO); 536 } 537 while (cc > 0) { 538 if ((RB_LEN(&tp->t_raw) + RB_LEN(&tp->t_can)) >= TTYHOG - 2 && 539 (RB_LEN(&tp->t_can) > 0 || !(tp->t_iflag&ICANON))) { 540 wakeup((caddr_t)&tp->t_raw); 541 goto block; 542 } 543 (*linesw[tp->t_line].l_rint)(*cp++, tp); 544 cnt++; 545 cc--; 546 } 547 cc = 0; 548 } 549 return (0); 550 block: 551 /* 552 * Come here to wait for slave to open, for space 553 * in outq, or space in rawq. 554 */ 555 if ((tp->t_state&TS_CARR_ON) == 0) 556 return (EIO); 557 if (flag & IO_NDELAY) { 558 /* adjust for data copied in but not written */ 559 uio->uio_resid += cc; 560 if (cnt == 0) 561 return (EWOULDBLOCK); 562 return (0); 563 } 564 if (error = tsleep((caddr_t)&tp->t_raw.rb_hd, TTOPRI | PCATCH, 565 ttyout, 0)) { 566 /* adjust for data copied in but not written */ 567 uio->uio_resid += cc; 568 return (error); 569 } 570 goto again; 571 } 572 573 /*ARGSUSED*/ 574 int 575 ptyioctl(dev, cmd, data, flag) 576 caddr_t data; 577 int cmd, flag; 578 dev_t dev; 579 { 580 register struct tty *tp = pt_tty[minor(dev)]; 581 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 582 register u_char *cc = tp->t_cc; 583 int stop, error; 584 585 /* 586 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 587 * ttywflush(tp) will hang if there are characters in the outq. 588 */ 589 if (cmd == TIOCEXT) { 590 /* 591 * When the EXTPROC bit is being toggled, we need 592 * to send an TIOCPKT_IOCTL if the packet driver 593 * is turned on. 594 */ 595 if (*(int *)data) { 596 if (pti->pt_flags & PF_PKT) { 597 pti->pt_send |= TIOCPKT_IOCTL; 598 ptcwakeup(tp, FREAD); 599 } 600 tp->t_lflag |= EXTPROC; 601 } else { 602 if ((tp->t_state & EXTPROC) && 603 (pti->pt_flags & PF_PKT)) { 604 pti->pt_send |= TIOCPKT_IOCTL; 605 ptcwakeup(tp, FREAD); 606 } 607 tp->t_lflag &= ~EXTPROC; 608 } 609 return(0); 610 } else 611 if (cdevsw[major(dev)].d_open == ptcopen) 612 switch (cmd) { 613 614 case TIOCGPGRP: 615 /* 616 * We aviod calling ttioctl on the controller since, 617 * in that case, tp must be the controlling terminal. 618 */ 619 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 620 return (0); 621 622 case TIOCPKT: 623 if (*(int *)data) { 624 if (pti->pt_flags & PF_UCNTL) 625 return (EINVAL); 626 pti->pt_flags |= PF_PKT; 627 } else 628 pti->pt_flags &= ~PF_PKT; 629 return (0); 630 631 case TIOCUCNTL: 632 if (*(int *)data) { 633 if (pti->pt_flags & PF_PKT) 634 return (EINVAL); 635 pti->pt_flags |= PF_UCNTL; 636 } else 637 pti->pt_flags &= ~PF_UCNTL; 638 return (0); 639 640 case TIOCREMOTE: 641 if (*(int *)data) 642 pti->pt_flags |= PF_REMOTE; 643 else 644 pti->pt_flags &= ~PF_REMOTE; 645 ttyflush(tp, FREAD|FWRITE); 646 return (0); 647 648 #ifdef COMPAT_43 649 /* wkt */ 650 case TIOCSETP: 651 case TIOCSETN: 652 #endif 653 case TIOCSETD: 654 case TIOCSETA: 655 case TIOCSETAW: 656 case TIOCSETAF: 657 while (rbgetc(&tp->t_out) >= 0) 658 ; 659 break; 660 661 case TIOCSIG: 662 if (*(unsigned int *)data >= NSIG) 663 return(EINVAL); 664 if ((tp->t_lflag&NOFLSH) == 0) 665 ttyflush(tp, FREAD|FWRITE); 666 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 667 if ((*(unsigned int *)data == SIGINFO) && 668 ((tp->t_lflag&NOKERNINFO) == 0)) 669 ttyinfo(tp); 670 return(0); 671 } 672 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag); 673 if (error < 0) 674 error = ttioctl(tp, cmd, data, flag); 675 /* 676 * Since we use the tty queues internally, 677 * pty's can't be switched to disciplines which overwrite 678 * the queues. We can't tell anything about the discipline 679 * from here... 680 */ 681 if (linesw[tp->t_line].l_rint != ttyinput) { 682 (*linesw[tp->t_line].l_close)(tp, flag); 683 tp->t_line = TTYDISC; 684 (void)(*linesw[tp->t_line].l_open)(dev, tp); 685 error = ENOTTY; 686 } 687 if (error < 0) { 688 if (pti->pt_flags & PF_UCNTL && 689 (cmd & ~0xff) == UIOCCMD(0)) { 690 if (cmd & 0xff) { 691 pti->pt_ucntl = (u_char)cmd; 692 ptcwakeup(tp, FREAD); 693 } 694 return (0); 695 } 696 error = ENOTTY; 697 } 698 /* 699 * If external processing and packet mode send ioctl packet. 700 */ 701 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 702 switch(cmd) { 703 case TIOCSETA: 704 case TIOCSETAW: 705 case TIOCSETAF: 706 #ifdef COMPAT_43 707 /* wkt */ 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 default: 718 break; 719 } 720 } 721 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 722 && CCEQ(cc[VSTART], CTRL('q')); 723 if (pti->pt_flags & PF_NOSTOP) { 724 if (stop) { 725 pti->pt_send &= ~TIOCPKT_NOSTOP; 726 pti->pt_send |= TIOCPKT_DOSTOP; 727 pti->pt_flags &= ~PF_NOSTOP; 728 ptcwakeup(tp, FREAD); 729 } 730 } else { 731 if (!stop) { 732 pti->pt_send &= ~TIOCPKT_DOSTOP; 733 pti->pt_send |= TIOCPKT_NOSTOP; 734 pti->pt_flags |= PF_NOSTOP; 735 ptcwakeup(tp, FREAD); 736 } 737 } 738 return (error); 739 } 740 #endif 741
Indexes created Tue Sep 30 20:09:53 GMT 2025