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 * @(#)tty_pty.c 7.21 (Berkeley) 5/30/91 34 * 35 * PATCHES MAGIC LEVEL PATCH THAT GOT US HERE 36 * -------------------- ----- ---------------------- 37 * CURRENT PATCH LEVEL: 5 00094 38 * -------------------- ----- ---------------------- 39 * 40 * 11 Dec 92 Williams Jolitz Fixed tty handling 41 * 42 * 28 Nov 1991 Warren Toomey Cleaned up the use of COMPAT_43 43 * in the 386BSD kernel. 44 * 6 Oct 1992 Holger Veit Fixed 'hanging console' bug 45 * 11 Jan 93 Julian Elischer Fixes multiple processes on one 46 * pty bug 47 * 27 Feb 93 Charles Hannum Proper return values for ptsclose() 48 * and ptcclose() 49 */ 50 static char rcsid[] = "$Header: /cvsroot/src/sys/kern/tty_pty.c,v 1.2 1993/03/21 18:04:42 cgd Exp $"; 51 52 /* 53 * Pseudo-teletype Driver 54 * (Actually two drivers, requiring two entries in 'cdevsw') 55 */ 56 #include "pty.h" 57 58 #if NPTY > 0 59 #include "param.h" 60 #include "systm.h" 61 #include "ioctl.h" 62 #include "tty.h" 63 #include "conf.h" 64 #include "file.h" 65 #include "proc.h" 66 #include "uio.h" 67 #include "kernel.h" 68 #include "vnode.h" 69 70 #if NPTY == 1 71 #undef NPTY 72 #define NPTY 32 /* crude XXX */ 73 #endif 74 75 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 76 77 /* 78 * pts == /dev/tty[pqrs]? 79 * ptc == /dev/pty[pqrs]? 80 */ 81 struct tty pt_tty[NPTY]; 82 struct pt_ioctl { 83 int pt_flags; 84 pid_t pt_selr, pt_selw; 85 u_char pt_send; 86 u_char pt_ucntl; 87 } pt_ioctl[NPTY]; 88 int npty = NPTY; /* for pstat -t */ 89 90 #define PF_RCOLL 0x01 91 #define PF_WCOLL 0x02 92 #define PF_PKT 0x08 /* packet mode */ 93 #define PF_STOPPED 0x10 /* user told stopped */ 94 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 95 #define PF_NOSTOP 0x40 96 #define PF_UCNTL 0x80 /* user control mode */ 97 98 /*ARGSUSED*/ 99 ptsopen(dev, flag, devtype, p) 100 dev_t dev; 101 struct proc *p; 102 { 103 register struct tty *tp; 104 int error; 105 106 #ifdef lint 107 npty = npty; 108 #endif 109 if (minor(dev) >= NPTY) 110 return (ENXIO); 111 tp = &pt_tty[minor(dev)]; 112 if ((tp->t_state & TS_ISOPEN) == 0) { 113 tp->t_state |= TS_WOPEN; 114 ttychars(tp); /* Set up default chars */ 115 tp->t_iflag = TTYDEF_IFLAG; 116 tp->t_oflag = TTYDEF_OFLAG; 117 tp->t_lflag = TTYDEF_LFLAG; 118 tp->t_cflag = TTYDEF_CFLAG; 119 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 120 ttsetwater(tp); /* would be done in xxparam() */ 121 } else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0) 122 return (EBUSY); 123 if (tp->t_oproc) /* Ctrlr still around. */ 124 tp->t_state |= TS_CARR_ON; 125 while ((tp->t_state & TS_CARR_ON) == 0) { 126 tp->t_state |= TS_WOPEN; 127 if (flag&FNONBLOCK) 128 break; 129 if (error = ttysleep(tp, (caddr_t)&tp->t_raw, TTIPRI | PCATCH, 130 ttopen, 0)) 131 return (error); 132 } 133 error = (*linesw[tp->t_line].l_open)(dev, tp, flag); 134 ptcwakeup(tp, FREAD|FWRITE); 135 return (error); 136 } 137 138 ptsclose(dev, flag, mode, p) 139 dev_t dev; 140 int flag, mode; 141 struct proc *p; 142 { 143 register struct tty *tp; 144 145 tp = &pt_tty[minor(dev)]; 146 (*linesw[tp->t_line].l_close)(tp, flag); 147 ttyclose(tp); 148 ptcwakeup(tp, FREAD|FWRITE); 149 return(0); 150 } 151 152 ptsread(dev, uio, flag) 153 dev_t dev; 154 struct uio *uio; 155 { 156 struct proc *p = curproc; 157 register struct tty *tp = &pt_tty[minor(dev)]; 158 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 159 int error = 0; 160 161 again: 162 if (pti->pt_flags & PF_REMOTE) { 163 while (isbackground(p, tp)) { 164 if ((p->p_sigignore & sigmask(SIGTTIN)) || 165 (p->p_sigmask & sigmask(SIGTTIN)) || 166 p->p_pgrp->pg_jobc == 0 || 167 p->p_flag&SPPWAIT) 168 return (EIO); 169 pgsignal(p->p_pgrp, SIGTTIN, 1); 170 if (error = ttysleep(tp, (caddr_t)&lbolt, 171 TTIPRI | PCATCH, ttybg, 0)) 172 return (error); 173 } 174 if (RB_LEN(&tp->t_can) == 0) { 175 if (flag & IO_NDELAY) 176 return (EWOULDBLOCK); 177 if (error = ttysleep(tp, (caddr_t)&tp->t_can, 178 TTIPRI | PCATCH, ttyin, 0)) 179 return (error); 180 goto again; 181 } 182 while (RB_LEN(&tp->t_can) > 1 && uio->uio_resid > 0) 183 if (ureadc(getc(&tp->t_can), uio) < 0) { 184 error = EFAULT; 185 break; 186 } 187 if (RB_LEN(&tp->t_can) == 1) 188 (void) getc(&tp->t_can); 189 if (RB_LEN(&tp->t_can)) 190 return (error); 191 } else 192 if (tp->t_oproc) 193 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 194 ptcwakeup(tp, FWRITE); 195 return (error); 196 } 197 198 /* 199 * Write to pseudo-tty. 200 * Wakeups of controlling tty will happen 201 * indirectly, when tty driver calls ptsstart. 202 */ 203 ptswrite(dev, uio, flag) 204 dev_t dev; 205 struct uio *uio; 206 { 207 register struct tty *tp; 208 209 tp = &pt_tty[minor(dev)]; 210 if (tp->t_oproc == 0) 211 return (EIO); 212 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 213 } 214 215 /* 216 * Start output on pseudo-tty. 217 * Wake up process selecting or sleeping for input from controlling tty. 218 */ 219 ptsstart(tp) 220 struct tty *tp; 221 { 222 register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 223 224 if (tp->t_state & TS_TTSTOP) 225 return; 226 if (pti->pt_flags & PF_STOPPED) { 227 pti->pt_flags &= ~PF_STOPPED; 228 pti->pt_send = TIOCPKT_START; 229 } 230 ptcwakeup(tp, FREAD); 231 } 232 233 ptcwakeup(tp, flag) 234 struct tty *tp; 235 { 236 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 237 238 if (flag & FREAD) { 239 if (pti->pt_selr) { 240 selwakeup(pti->pt_selr, pti->pt_flags & PF_RCOLL); 241 pti->pt_selr = 0; 242 pti->pt_flags &= ~PF_RCOLL; 243 } 244 wakeup((caddr_t)&tp->t_out.rb_tl); 245 } 246 if (flag & FWRITE) { 247 if (pti->pt_selw) { 248 selwakeup(pti->pt_selw, pti->pt_flags & PF_WCOLL); 249 pti->pt_selw = 0; 250 pti->pt_flags &= ~PF_WCOLL; 251 } 252 wakeup((caddr_t)&tp->t_raw.rb_hd); 253 } 254 } 255 256 /*ARGSUSED*/ 257 #ifdef __STDC__ 258 ptcopen(dev_t dev, int flag, int devtype, struct proc *p) 259 #else 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 tp = &pt_tty[minor(dev)]; 272 if (tp->t_oproc) 273 return (EIO); 274 tp->t_oproc = ptsstart; 275 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 276 tp->t_lflag &= ~EXTPROC; 277 pti = &pt_ioctl[minor(dev)]; 278 pti->pt_flags = 0; 279 pti->pt_send = 0; 280 pti->pt_ucntl = 0; 281 return (0); 282 } 283 284 extern struct tty *constty; /* -hv- 06.Oct.92*/ 285 ptcclose(dev) 286 dev_t dev; 287 { 288 register struct tty *tp; 289 290 tp = &pt_tty[minor(dev)]; 291 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 292 tp->t_state &= ~TS_CARR_ON; 293 tp->t_oproc = 0; /* mark closed */ 294 tp->t_session = 0; 295 296 /* XXX -hv- 6.Oct.92 this prevents the "hanging console bug" with X11 */ 297 if (constty==tp) 298 constty = 0; 299 300 return (0); 301 } 302 303 ptcread(dev, uio, flag) 304 dev_t dev; 305 struct uio *uio; 306 { 307 register struct tty *tp = &pt_tty[minor(dev)]; 308 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 309 char buf[BUFSIZ]; 310 int error = 0, cc; 311 312 /* 313 * We want to block until the slave 314 * is open, and there's something to read; 315 * but if we lost the slave or we're NBIO, 316 * then return the appropriate error instead. 317 */ 318 for (;;) { 319 if (tp->t_state&TS_ISOPEN) { 320 if (pti->pt_flags&PF_PKT && pti->pt_send) { 321 error = ureadc((int)pti->pt_send, uio); 322 if (error) 323 return (error); 324 if (pti->pt_send & TIOCPKT_IOCTL) { 325 cc = MIN(uio->uio_resid, 326 sizeof(tp->t_termios)); 327 uiomove(&tp->t_termios, cc, uio); 328 } 329 pti->pt_send = 0; 330 return (0); 331 } 332 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 333 error = ureadc((int)pti->pt_ucntl, uio); 334 if (error) 335 return (error); 336 pti->pt_ucntl = 0; 337 return (0); 338 } 339 if (RB_LEN(&tp->t_out) && (tp->t_state&TS_TTSTOP) == 0) 340 break; 341 } 342 if ((tp->t_state&TS_CARR_ON) == 0) 343 return (0); /* EOF */ 344 if (flag & IO_NDELAY) 345 return (EWOULDBLOCK); 346 if (error = tsleep((caddr_t)&tp->t_out.rb_tl, TTIPRI | PCATCH, 347 ttyin, 0)) 348 return (error); 349 } 350 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 351 error = ureadc(0, uio); 352 while (uio->uio_resid > 0 && error == 0) { 353 #ifdef was 354 cc = q_to_b(&tp->t_outq, buf, MIN(uio->uio_resid, BUFSIZ)); 355 #else 356 cc = min(MIN(uio->uio_resid, BUFSIZ), RB_CONTIGGET(&tp->t_out)); 357 if (cc) { 358 bcopy(tp->t_out.rb_hd, buf, cc); 359 tp->t_out.rb_hd = 360 RB_ROLLOVER(&tp->t_out, tp->t_out.rb_hd+cc); 361 } 362 #endif 363 if (cc <= 0) 364 break; 365 error = uiomove(buf, cc, uio); 366 } 367 if (RB_LEN(&tp->t_out) <= tp->t_lowat) { 368 if (tp->t_state&TS_ASLEEP) { 369 tp->t_state &= ~TS_ASLEEP; 370 wakeup((caddr_t)&tp->t_out); 371 } 372 if (tp->t_wsel) { 373 selwakeup(tp->t_wsel, tp->t_state & TS_WCOLL); 374 tp->t_wsel = 0; 375 tp->t_state &= ~TS_WCOLL; 376 } 377 } 378 return (error); 379 } 380 381 ptsstop(tp, flush) 382 register struct tty *tp; 383 int flush; 384 { 385 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 386 int flag; 387 388 /* note: FLUSHREAD and FLUSHWRITE already ok */ 389 if (flush == 0) { 390 flush = TIOCPKT_STOP; 391 pti->pt_flags |= PF_STOPPED; 392 } else 393 pti->pt_flags &= ~PF_STOPPED; 394 pti->pt_send |= flush; 395 /* change of perspective */ 396 flag = 0; 397 if (flush & FREAD) 398 flag |= FWRITE; 399 if (flush & FWRITE) 400 flag |= FREAD; 401 ptcwakeup(tp, flag); 402 } 403 404 ptcselect(dev, rw, p) 405 dev_t dev; 406 int rw; 407 struct proc *p; 408 { 409 register struct tty *tp = &pt_tty[minor(dev)]; 410 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 411 struct proc *prev; 412 int s; 413 414 if ((tp->t_state&TS_CARR_ON) == 0) 415 return (1); 416 switch (rw) { 417 418 case FREAD: 419 /* 420 * Need to block timeouts (ttrstart). 421 */ 422 s = spltty(); 423 if ((tp->t_state&TS_ISOPEN) && 424 RB_LEN(&tp->t_out) && (tp->t_state&TS_TTSTOP) == 0) { 425 splx(s); 426 return (1); 427 } 428 splx(s); 429 /* FALLTHROUGH */ 430 431 case 0: /* exceptional */ 432 if ((tp->t_state&TS_ISOPEN) && 433 (pti->pt_flags&PF_PKT && pti->pt_send || 434 pti->pt_flags&PF_UCNTL && pti->pt_ucntl)) 435 return (1); 436 if (pti->pt_selr && (prev = pfind(pti->pt_selr)) && prev->p_wchan == (caddr_t)&selwait) 437 pti->pt_flags |= PF_RCOLL; 438 else 439 pti->pt_selr = p->p_pid; 440 break; 441 442 443 case FWRITE: 444 if (tp->t_state&TS_ISOPEN) { 445 if (pti->pt_flags & PF_REMOTE) { 446 if (RB_LEN(&tp->t_can) == 0) 447 return (1); 448 } else { 449 if (RB_LEN(&tp->t_raw) + RB_LEN(&tp->t_can) < TTYHOG-2) 450 return (1); 451 if (RB_LEN(&tp->t_can) == 0 && (tp->t_iflag&ICANON)) 452 return (1); 453 } 454 } 455 if (pti->pt_selw && (prev = pfind(pti->pt_selw)) && prev->p_wchan == (caddr_t)&selwait) 456 pti->pt_flags |= PF_WCOLL; 457 else 458 pti->pt_selw = p->p_pid; 459 break; 460 461 } 462 return (0); 463 } 464 465 ptcwrite(dev, uio, flag) 466 dev_t dev; 467 register struct uio *uio; 468 { 469 register struct tty *tp = &pt_tty[minor(dev)]; 470 register u_char *cp; 471 register int cc = 0; 472 u_char locbuf[BUFSIZ]; 473 int cnt = 0; 474 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 475 int error = 0; 476 477 again: 478 if ((tp->t_state&TS_ISOPEN) == 0) 479 goto block; 480 if (pti->pt_flags & PF_REMOTE) { 481 if (RB_LEN(&tp->t_can)) 482 goto block; 483 while (uio->uio_resid > 0 && RB_LEN(&tp->t_can) < TTYHOG - 1) { 484 if (cc == 0) { 485 cc = min(uio->uio_resid, BUFSIZ); 486 cc = min(cc, TTYHOG - 1 - RB_CONTIGPUT(&tp->t_can)); 487 cp = locbuf; 488 error = uiomove((caddr_t)cp, cc, uio); 489 if (error) 490 return (error); 491 /* check again for safety */ 492 if ((tp->t_state&TS_ISOPEN) == 0) 493 return (EIO); 494 } 495 #ifdef was 496 if (cc) 497 (void) b_to_q((char *)cp, cc, &tp->t_canq); 498 #else 499 if (cc) { 500 bcopy(cp, tp->t_can.rb_tl, cc); 501 tp->t_can.rb_tl = 502 RB_ROLLOVER(&tp->t_can, tp->t_can.rb_tl+cc); 503 } 504 #endif 505 cc = 0; 506 } 507 (void) putc(0, &tp->t_can); 508 ttwakeup(tp); 509 wakeup((caddr_t)&tp->t_can); 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 ((RB_LEN(&tp->t_raw) + RB_LEN(&tp->t_can)) >= TTYHOG - 2 && 525 (RB_LEN(&tp->t_can) > 0 || !(tp->t_iflag&ICANON))) { 526 wakeup((caddr_t)&tp->t_raw); 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_raw.rb_hd, 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 ptyioctl(dev, cmd, data, flag) 561 caddr_t data; 562 dev_t dev; 563 { 564 register struct tty *tp = &pt_tty[minor(dev)]; 565 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 566 register u_char *cc = tp->t_cc; 567 int stop, error; 568 extern ttyinput(); 569 570 /* 571 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 572 * ttywflush(tp) will hang if there are characters in the outq. 573 */ 574 if (cmd == TIOCEXT) { 575 /* 576 * When the EXTPROC bit is being toggled, we need 577 * to send an TIOCPKT_IOCTL if the packet driver 578 * is turned on. 579 */ 580 if (*(int *)data) { 581 if (pti->pt_flags & PF_PKT) { 582 pti->pt_send |= TIOCPKT_IOCTL; 583 ptcwakeup(tp, FREAD); 584 } 585 tp->t_lflag |= EXTPROC; 586 } else { 587 if ((tp->t_state & EXTPROC) && 588 (pti->pt_flags & PF_PKT)) { 589 pti->pt_send |= TIOCPKT_IOCTL; 590 ptcwakeup(tp, FREAD); 591 } 592 tp->t_lflag &= ~EXTPROC; 593 } 594 return(0); 595 } else 596 if (cdevsw[major(dev)].d_open == ptcopen) 597 switch (cmd) { 598 599 case TIOCGPGRP: 600 /* 601 * We aviod calling ttioctl on the controller since, 602 * in that case, tp must be the controlling terminal. 603 */ 604 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 605 return (0); 606 607 case TIOCPKT: 608 if (*(int *)data) { 609 if (pti->pt_flags & PF_UCNTL) 610 return (EINVAL); 611 pti->pt_flags |= PF_PKT; 612 } else 613 pti->pt_flags &= ~PF_PKT; 614 return (0); 615 616 case TIOCUCNTL: 617 if (*(int *)data) { 618 if (pti->pt_flags & PF_PKT) 619 return (EINVAL); 620 pti->pt_flags |= PF_UCNTL; 621 } else 622 pti->pt_flags &= ~PF_UCNTL; 623 return (0); 624 625 case TIOCREMOTE: 626 if (*(int *)data) 627 pti->pt_flags |= PF_REMOTE; 628 else 629 pti->pt_flags &= ~PF_REMOTE; 630 ttyflush(tp, FREAD|FWRITE); 631 return (0); 632 633 #ifdef COMPAT_43 634 /* wkt */ 635 case TIOCSETP: 636 case TIOCSETN: 637 #endif 638 case TIOCSETD: 639 case TIOCSETA: 640 case TIOCSETAW: 641 case TIOCSETAF: 642 while (getc(&tp->t_out) >= 0) 643 ; 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, flag); 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 #endif 726