tty_pty.c revision 1.22
1 /* 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. 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 8.2 (Berkeley) 9/23/93 34 * $Id: tty_pty.c,v 1.22 1994/05/12 03:48:36 cgd Exp $ 35 */ 36 37 /* 38 * Pseudo-teletype Driver 39 * (Actually two drivers, requiring two entries in 'cdevsw') 40 */ 41 #include "pty.h" /* XXX */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/ioctl.h> 46 #include <sys/proc.h> 47 #include <sys/tty.h> 48 #include <sys/conf.h> 49 #include <sys/file.h> 50 #include <sys/uio.h> 51 #include <sys/kernel.h> 52 #include <sys/vnode.h> 53 54 #if NPTY == 1 55 #undef NPTY 56 #define NPTY 32 /* crude XXX */ 57 #endif 58 59 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 60 61 /* 62 * pts == /dev/tty[pqrs]? 63 * ptc == /dev/pty[pqrs]? 64 */ 65 struct tty *pt_tty[NPTY]; /* XXX */ 66 struct pt_ioctl { 67 int pt_flags; 68 struct selinfo pt_selr, pt_selw; 69 u_char pt_send; 70 u_char pt_ucntl; 71 } pt_ioctl[NPTY]; /* XXX */ 72 int npty = NPTY; /* for pstat -t */ 73 74 #define PF_PKT 0x08 /* packet mode */ 75 #define PF_STOPPED 0x10 /* user told stopped */ 76 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 77 #define PF_NOSTOP 0x40 78 #define PF_UCNTL 0x80 /* user control mode */ 79 80 void ptsstop __P((struct tty *, int)); 81 82 /* 83 * Establish n (or default if n is 1) ptys in the system. 84 * 85 * XXX cdevsw & pstat require the array `pty[]' to be an array 86 */ 87 void 88 ptyattach(n) 89 int n; 90 { 91 #ifdef notyet 92 char *mem; 93 register u_long ntb; 94 #define DEFAULT_NPTY 32 95 96 /* maybe should allow 0 => none? */ 97 if (n <= 1) 98 n = DEFAULT_NPTY; 99 ntb = n * sizeof(struct tty); 100 mem = malloc(ntb + ALIGNBYTES + n * sizeof(struct pt_ioctl), 101 M_DEVBUF, M_WAITOK); 102 pt_tty = (struct tty *)mem; 103 mem = (char *)ALIGN(mem + ntb); 104 pt_ioctl = (struct pt_ioctl *)mem; 105 npty = n; 106 #endif 107 } 108 109 /*ARGSUSED*/ 110 ptsopen(dev, flag, devtype, p) 111 dev_t dev; 112 int flag, devtype; 113 struct proc *p; 114 { 115 register struct tty *tp; 116 int error; 117 118 if (minor(dev) >= npty) 119 return (ENXIO); 120 if (!pt_tty[minor(dev)]) { 121 tp = pt_tty[minor(dev)] = ttymalloc(); 122 } else 123 tp = pt_tty[minor(dev)]; 124 if ((tp->t_state & TS_ISOPEN) == 0) { 125 tp->t_state |= TS_WOPEN; 126 ttychars(tp); /* Set up default chars */ 127 tp->t_iflag = TTYDEF_IFLAG; 128 tp->t_oflag = TTYDEF_OFLAG; 129 tp->t_lflag = TTYDEF_LFLAG; 130 tp->t_cflag = TTYDEF_CFLAG; 131 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 132 ttsetwater(tp); /* would be done in xxparam() */ 133 } else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0) 134 return (EBUSY); 135 if (tp->t_oproc) /* Ctrlr still around. */ 136 tp->t_state |= TS_CARR_ON; 137 while ((tp->t_state & TS_CARR_ON) == 0) { 138 tp->t_state |= TS_WOPEN; 139 if (flag&FNONBLOCK) 140 break; 141 if (error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH, 142 ttopen, 0)) 143 return (error); 144 } 145 error = (*linesw[tp->t_line].l_open)(dev, tp); 146 ptcwakeup(tp, FREAD|FWRITE); 147 return (error); 148 } 149 150 ptsclose(dev, flag, mode, p) 151 dev_t dev; 152 int flag, mode; 153 struct proc *p; 154 { 155 register struct tty *tp; 156 int err; 157 158 tp = pt_tty[minor(dev)]; 159 err = (*linesw[tp->t_line].l_close)(tp, flag); 160 err |= ttyclose(tp); 161 ptcwakeup(tp, FREAD|FWRITE); 162 return (err); 163 } 164 165 ptsread(dev, uio, flag) 166 dev_t dev; 167 struct uio *uio; 168 int flag; 169 { 170 struct proc *p = curproc; 171 register struct tty *tp = pt_tty[minor(dev)]; 172 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 173 int error = 0; 174 175 again: 176 if (pti->pt_flags & PF_REMOTE) { 177 while (isbackground(p, tp)) { 178 if ((p->p_sigignore & sigmask(SIGTTIN)) || 179 (p->p_sigmask & sigmask(SIGTTIN)) || 180 p->p_pgrp->pg_jobc == 0 || 181 p->p_flag & P_PPWAIT) 182 return (EIO); 183 pgsignal(p->p_pgrp, SIGTTIN, 1); 184 if (error = ttysleep(tp, (caddr_t)&lbolt, 185 TTIPRI | PCATCH, ttybg, 0)) 186 return (error); 187 } 188 if (tp->t_canq.c_cc == 0) { 189 if (flag & IO_NDELAY) 190 return (EWOULDBLOCK); 191 if (error = ttysleep(tp, (caddr_t)&tp->t_canq, 192 TTIPRI | PCATCH, ttyin, 0)) 193 return (error); 194 goto again; 195 } 196 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 197 if (ureadc(getc(&tp->t_canq), uio) < 0) { 198 error = EFAULT; 199 break; 200 } 201 if (tp->t_canq.c_cc == 1) 202 (void) getc(&tp->t_canq); 203 if (tp->t_canq.c_cc) 204 return (error); 205 } else 206 if (tp->t_oproc) 207 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 208 ptcwakeup(tp, FWRITE); 209 return (error); 210 } 211 212 /* 213 * Write to pseudo-tty. 214 * Wakeups of controlling tty will happen 215 * indirectly, when tty driver calls ptsstart. 216 */ 217 ptswrite(dev, uio, flag) 218 dev_t dev; 219 struct uio *uio; 220 int flag; 221 { 222 register struct tty *tp; 223 224 tp = pt_tty[minor(dev)]; 225 if (tp->t_oproc == 0) 226 return (EIO); 227 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 228 } 229 230 /* 231 * Start output on pseudo-tty. 232 * Wake up process selecting or sleeping for input from controlling tty. 233 */ 234 void 235 ptsstart(tp) 236 struct tty *tp; 237 { 238 register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 239 240 if (tp->t_state & TS_TTSTOP) 241 return; 242 if (pti->pt_flags & PF_STOPPED) { 243 pti->pt_flags &= ~PF_STOPPED; 244 pti->pt_send = TIOCPKT_START; 245 } 246 ptcwakeup(tp, FREAD); 247 } 248 249 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_cf); 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 ptcopen(dev_t dev, int flag, int devtype, struct proc *p) 268 #else 269 ptcopen(dev, flag, devtype, p) 270 dev_t dev; 271 int flag, devtype; 272 struct proc *p; 273 #endif 274 { 275 register struct tty *tp; 276 struct pt_ioctl *pti; 277 278 if (minor(dev) >= npty) 279 return (ENXIO); 280 if(!pt_tty[minor(dev)]) { 281 tp = pt_tty[minor(dev)] = ttymalloc(); 282 } else 283 tp = pt_tty[minor(dev)]; 284 if (tp->t_oproc) 285 return (EIO); 286 tp->t_oproc = ptsstart; 287 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 288 tp->t_lflag &= ~EXTPROC; 289 pti = &pt_ioctl[minor(dev)]; 290 pti->pt_flags = 0; 291 pti->pt_send = 0; 292 pti->pt_ucntl = 0; 293 return (0); 294 } 295 296 ptcclose(dev) 297 dev_t dev; 298 { 299 register struct tty *tp; 300 301 tp = pt_tty[minor(dev)]; 302 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 303 tp->t_state &= ~TS_CARR_ON; 304 tp->t_oproc = 0; /* mark closed */ 305 return (0); 306 } 307 308 ptcread(dev, uio, flag) 309 dev_t dev; 310 struct uio *uio; 311 int flag; 312 { 313 register struct tty *tp = pt_tty[minor(dev)]; 314 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 315 char buf[BUFSIZ]; 316 int error = 0, cc; 317 318 /* 319 * We want to block until the slave 320 * is open, and there's something to read; 321 * but if we lost the slave or we're NBIO, 322 * then return the appropriate error instead. 323 */ 324 for (;;) { 325 if (tp->t_state&TS_ISOPEN) { 326 if (pti->pt_flags&PF_PKT && pti->pt_send) { 327 error = ureadc((int)pti->pt_send, uio); 328 if (error) 329 return (error); 330 if (pti->pt_send & TIOCPKT_IOCTL) { 331 cc = min(uio->uio_resid, 332 sizeof(tp->t_termios)); 333 uiomove(&tp->t_termios, cc, uio); 334 } 335 pti->pt_send = 0; 336 return (0); 337 } 338 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 339 error = ureadc((int)pti->pt_ucntl, uio); 340 if (error) 341 return (error); 342 pti->pt_ucntl = 0; 343 return (0); 344 } 345 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 346 break; 347 } 348 if ((tp->t_state&TS_CARR_ON) == 0) 349 return (0); /* EOF */ 350 if (flag & IO_NDELAY) 351 return (EWOULDBLOCK); 352 if (error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH, 353 ttyin, 0)) 354 return (error); 355 } 356 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 357 error = ureadc(0, uio); 358 while (uio->uio_resid > 0 && error == 0) { 359 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 360 if (cc <= 0) 361 break; 362 error = uiomove(buf, cc, uio); 363 } 364 if (tp->t_outq.c_cc <= tp->t_lowat) { 365 if (tp->t_state&TS_ASLEEP) { 366 tp->t_state &= ~TS_ASLEEP; 367 wakeup((caddr_t)&tp->t_outq); 368 } 369 selwakeup(&tp->t_wsel); 370 } 371 return (error); 372 } 373 374 void 375 ptsstop(tp, flush) 376 register struct tty *tp; 377 int flush; 378 { 379 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 380 int flag; 381 382 /* note: FLUSHREAD and FLUSHWRITE already ok */ 383 if (flush == 0) { 384 flush = TIOCPKT_STOP; 385 pti->pt_flags |= PF_STOPPED; 386 } else 387 pti->pt_flags &= ~PF_STOPPED; 388 pti->pt_send |= flush; 389 /* change of perspective */ 390 flag = 0; 391 if (flush & FREAD) 392 flag |= FWRITE; 393 if (flush & FWRITE) 394 flag |= FREAD; 395 ptcwakeup(tp, flag); 396 } 397 398 ptcselect(dev, rw, p) 399 dev_t dev; 400 int rw; 401 struct proc *p; 402 { 403 register struct tty *tp = pt_tty[minor(dev)]; 404 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 405 int s; 406 407 if ((tp->t_state&TS_CARR_ON) == 0) 408 return (1); 409 switch (rw) { 410 411 case FREAD: 412 /* 413 * Need to block timeouts (ttrstart). 414 */ 415 s = spltty(); 416 if ((tp->t_state&TS_ISOPEN) && 417 tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) { 418 splx(s); 419 return (1); 420 } 421 splx(s); 422 /* FALLTHROUGH */ 423 424 case 0: /* exceptional */ 425 if ((tp->t_state&TS_ISOPEN) && 426 (pti->pt_flags&PF_PKT && pti->pt_send || 427 pti->pt_flags&PF_UCNTL && pti->pt_ucntl)) 428 return (1); 429 selrecord(p, &pti->pt_selr); 430 break; 431 432 433 case FWRITE: 434 if (tp->t_state&TS_ISOPEN) { 435 if (pti->pt_flags & PF_REMOTE) { 436 if (tp->t_canq.c_cc == 0) 437 return (1); 438 } else { 439 if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) 440 return (1); 441 if (tp->t_canq.c_cc == 0 && (tp->t_iflag&ICANON)) 442 return (1); 443 } 444 } 445 selrecord(p, &pti->pt_selw); 446 break; 447 448 } 449 return (0); 450 } 451 452 ptcwrite(dev, uio, flag) 453 dev_t dev; 454 register struct uio *uio; 455 int flag; 456 { 457 register struct tty *tp = pt_tty[minor(dev)]; 458 register u_char *cp; 459 register int cc = 0; 460 u_char locbuf[BUFSIZ]; 461 int cnt = 0; 462 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 463 int error = 0; 464 465 again: 466 if ((tp->t_state&TS_ISOPEN) == 0) 467 goto block; 468 if (pti->pt_flags & PF_REMOTE) { 469 if (tp->t_canq.c_cc) 470 goto block; 471 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 472 if (cc == 0) { 473 cc = min(uio->uio_resid, BUFSIZ); 474 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 475 cp = locbuf; 476 error = uiomove((caddr_t)cp, cc, uio); 477 if (error) 478 return (error); 479 /* check again for safety */ 480 if ((tp->t_state&TS_ISOPEN) == 0) 481 return (EIO); 482 } 483 if (cc) 484 (void) b_to_q((char *)cp, cc, &tp->t_canq); 485 cc = 0; 486 } 487 (void) putc(0, &tp->t_canq); 488 ttwakeup(tp); 489 wakeup((caddr_t)&tp->t_canq); 490 return (0); 491 } 492 while (uio->uio_resid > 0) { 493 if (cc == 0) { 494 cc = min(uio->uio_resid, BUFSIZ); 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 while (cc > 0) { 504 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 505 (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 506 wakeup((caddr_t)&tp->t_rawq); 507 goto block; 508 } 509 (*linesw[tp->t_line].l_rint)(*cp++, tp); 510 cnt++; 511 cc--; 512 } 513 cc = 0; 514 } 515 return (0); 516 block: 517 /* 518 * Come here to wait for slave to open, for space 519 * in outq, or space in rawq. 520 */ 521 if ((tp->t_state&TS_CARR_ON) == 0) 522 return (EIO); 523 if (flag & IO_NDELAY) { 524 /* adjust for data copied in but not written */ 525 uio->uio_resid += cc; 526 if (cnt == 0) 527 return (EWOULDBLOCK); 528 return (0); 529 } 530 if (error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 531 ttyout, 0)) { 532 /* adjust for data copied in but not written */ 533 uio->uio_resid += cc; 534 return (error); 535 } 536 goto again; 537 } 538 539 /*ARGSUSED*/ 540 ptyioctl(dev, cmd, data, flag, p) 541 dev_t dev; 542 int cmd; 543 caddr_t data; 544 int flag; 545 struct proc *p; 546 { 547 register struct tty *tp = pt_tty[minor(dev)]; 548 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 549 register u_char *cc = tp->t_cc; 550 int stop, error; 551 552 /* 553 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 554 * ttywflush(tp) will hang if there are characters in the outq. 555 */ 556 if (cmd == TIOCEXT) { 557 /* 558 * When the EXTPROC bit is being toggled, we need 559 * to send an TIOCPKT_IOCTL if the packet driver 560 * is turned on. 561 */ 562 if (*(int *)data) { 563 if (pti->pt_flags & PF_PKT) { 564 pti->pt_send |= TIOCPKT_IOCTL; 565 ptcwakeup(tp, FREAD); 566 } 567 tp->t_lflag |= EXTPROC; 568 } else { 569 if ((tp->t_state & EXTPROC) && 570 (pti->pt_flags & PF_PKT)) { 571 pti->pt_send |= TIOCPKT_IOCTL; 572 ptcwakeup(tp, FREAD); 573 } 574 tp->t_lflag &= ~EXTPROC; 575 } 576 return(0); 577 } else 578 if (cdevsw[major(dev)].d_open == ptcopen) 579 switch (cmd) { 580 581 case TIOCGPGRP: 582 /* 583 * We aviod calling ttioctl on the controller since, 584 * in that case, tp must be the controlling terminal. 585 */ 586 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 587 return (0); 588 589 case TIOCPKT: 590 if (*(int *)data) { 591 if (pti->pt_flags & PF_UCNTL) 592 return (EINVAL); 593 pti->pt_flags |= PF_PKT; 594 } else 595 pti->pt_flags &= ~PF_PKT; 596 return (0); 597 598 case TIOCUCNTL: 599 if (*(int *)data) { 600 if (pti->pt_flags & PF_PKT) 601 return (EINVAL); 602 pti->pt_flags |= PF_UCNTL; 603 } else 604 pti->pt_flags &= ~PF_UCNTL; 605 return (0); 606 607 case TIOCREMOTE: 608 if (*(int *)data) 609 pti->pt_flags |= PF_REMOTE; 610 else 611 pti->pt_flags &= ~PF_REMOTE; 612 ttyflush(tp, FREAD|FWRITE); 613 return (0); 614 615 #ifdef COMPAT_43 616 case TIOCSETP: 617 case TIOCSETN: 618 #endif 619 case TIOCSETD: 620 case TIOCSETA: 621 case TIOCSETAW: 622 case TIOCSETAF: 623 ndflush(&tp->t_outq, tp->t_outq.c_cc); 624 break; 625 626 case TIOCSIG: 627 if (*(unsigned int *)data >= NSIG) 628 return(EINVAL); 629 if ((tp->t_lflag&NOFLSH) == 0) 630 ttyflush(tp, FREAD|FWRITE); 631 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 632 if ((*(unsigned int *)data == SIGINFO) && 633 ((tp->t_lflag&NOKERNINFO) == 0)) 634 ttyinfo(tp); 635 return(0); 636 } 637 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 638 if (error < 0) 639 error = ttioctl(tp, cmd, data, flag, p); 640 if (error < 0) { 641 if (pti->pt_flags & PF_UCNTL && 642 (cmd & ~0xff) == UIOCCMD(0)) { 643 if (cmd & 0xff) { 644 pti->pt_ucntl = (u_char)cmd; 645 ptcwakeup(tp, FREAD); 646 } 647 return (0); 648 } 649 error = ENOTTY; 650 } 651 /* 652 * If external processing and packet mode send ioctl packet. 653 */ 654 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 655 switch(cmd) { 656 case TIOCSETA: 657 case TIOCSETAW: 658 case TIOCSETAF: 659 #ifdef COMPAT_43 660 case TIOCSETP: 661 case TIOCSETN: 662 #endif 663 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 664 case TIOCSETC: 665 case TIOCSLTC: 666 case TIOCLBIS: 667 case TIOCLBIC: 668 case TIOCLSET: 669 #endif 670 pti->pt_send |= TIOCPKT_IOCTL; 671 ptcwakeup(tp, FREAD); 672 default: 673 break; 674 } 675 } 676 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 677 && CCEQ(cc[VSTART], CTRL('q')); 678 if (pti->pt_flags & PF_NOSTOP) { 679 if (stop) { 680 pti->pt_send &= ~TIOCPKT_NOSTOP; 681 pti->pt_send |= TIOCPKT_DOSTOP; 682 pti->pt_flags &= ~PF_NOSTOP; 683 ptcwakeup(tp, FREAD); 684 } 685 } else { 686 if (!stop) { 687 pti->pt_send &= ~TIOCPKT_DOSTOP; 688 pti->pt_send |= TIOCPKT_NOSTOP; 689 pti->pt_flags |= PF_NOSTOP; 690 ptcwakeup(tp, FREAD); 691 } 692 } 693 return (error); 694 } 695
Indexes created Tue Sep 30 20:09:53 GMT 2025