tty_pty.c revision 1.26
1 /* $NetBSD: tty_pty.c,v 1.26 1994/12/14 19:45:30 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/conf.h> 50 #include <sys/file.h> 51 #include <sys/uio.h> 52 #include <sys/kernel.h> 53 #include <sys/vnode.h> 54 55 #if NPTY == 1 56 #undef NPTY 57 #define NPTY 32 /* crude XXX */ 58 #endif 59 60 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 61 62 /* 63 * pts == /dev/tty[pqrs]? 64 * ptc == /dev/pty[pqrs]? 65 */ 66 struct tty *pt_tty[NPTY]; /* XXX */ 67 struct pt_ioctl { 68 int pt_flags; 69 struct selinfo pt_selr, pt_selw; 70 u_char pt_send; 71 u_char pt_ucntl; 72 } pt_ioctl[NPTY]; /* XXX */ 73 int npty = NPTY; /* for pstat -t */ 74 75 #define PF_PKT 0x08 /* packet mode */ 76 #define PF_STOPPED 0x10 /* user told stopped */ 77 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 78 #define PF_NOSTOP 0x40 79 #define PF_UCNTL 0x80 /* user control mode */ 80 81 void ptsstop __P((struct tty *, int)); 82 83 /* 84 * Establish n (or default if n is 1) ptys in the system. 85 * 86 * XXX cdevsw & pstat require the array `pty[]' to be an array 87 */ 88 void 89 ptyattach(n) 90 int n; 91 { 92 #ifdef notyet 93 char *mem; 94 register u_long ntb; 95 #define DEFAULT_NPTY 32 96 97 /* maybe should allow 0 => none? */ 98 if (n <= 1) 99 n = DEFAULT_NPTY; 100 ntb = n * sizeof(struct tty); 101 mem = malloc(ntb + ALIGNBYTES + n * sizeof(struct pt_ioctl), 102 M_DEVBUF, M_WAITOK); 103 pt_tty = (struct tty *)mem; 104 mem = (char *)ALIGN(mem + ntb); 105 pt_ioctl = (struct pt_ioctl *)mem; 106 npty = n; 107 #endif 108 } 109 110 /*ARGSUSED*/ 111 ptsopen(dev, flag, devtype, p) 112 dev_t dev; 113 int flag, devtype; 114 struct proc *p; 115 { 116 register struct tty *tp; 117 int error; 118 119 if (minor(dev) >= npty) 120 return (ENXIO); 121 if (!pt_tty[minor(dev)]) { 122 tp = pt_tty[minor(dev)] = ttymalloc(); 123 } else 124 tp = pt_tty[minor(dev)]; 125 if ((tp->t_state & TS_ISOPEN) == 0) { 126 tp->t_state |= TS_WOPEN; 127 ttychars(tp); /* Set up default chars */ 128 tp->t_iflag = TTYDEF_IFLAG; 129 tp->t_oflag = TTYDEF_OFLAG; 130 tp->t_lflag = TTYDEF_LFLAG; 131 tp->t_cflag = TTYDEF_CFLAG; 132 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 133 ttsetwater(tp); /* would be done in xxparam() */ 134 } else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0) 135 return (EBUSY); 136 if (tp->t_oproc) /* Ctrlr still around. */ 137 tp->t_state |= TS_CARR_ON; 138 while ((tp->t_state & TS_CARR_ON) == 0) { 139 tp->t_state |= TS_WOPEN; 140 if (flag&FNONBLOCK) 141 break; 142 if (error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH, 143 ttopen, 0)) 144 return (error); 145 } 146 error = (*linesw[tp->t_line].l_open)(dev, tp); 147 ptcwakeup(tp, FREAD|FWRITE); 148 return (error); 149 } 150 151 ptsclose(dev, flag, mode, p) 152 dev_t dev; 153 int flag, mode; 154 struct proc *p; 155 { 156 register struct tty *tp; 157 int err; 158 159 tp = pt_tty[minor(dev)]; 160 err = (*linesw[tp->t_line].l_close)(tp, flag); 161 err |= ttyclose(tp); 162 ptcwakeup(tp, FREAD|FWRITE); 163 return (err); 164 } 165 166 ptsread(dev, uio, flag) 167 dev_t dev; 168 struct uio *uio; 169 int flag; 170 { 171 struct proc *p = curproc; 172 register struct tty *tp = pt_tty[minor(dev)]; 173 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 174 int error = 0; 175 176 again: 177 if (pti->pt_flags & PF_REMOTE) { 178 while (isbackground(p, tp)) { 179 if ((p->p_sigignore & sigmask(SIGTTIN)) || 180 (p->p_sigmask & sigmask(SIGTTIN)) || 181 p->p_pgrp->pg_jobc == 0 || 182 p->p_flag & P_PPWAIT) 183 return (EIO); 184 pgsignal(p->p_pgrp, SIGTTIN, 1); 185 if (error = ttysleep(tp, (caddr_t)&lbolt, 186 TTIPRI | PCATCH, ttybg, 0)) 187 return (error); 188 } 189 if (tp->t_canq.c_cc == 0) { 190 if (flag & IO_NDELAY) 191 return (EWOULDBLOCK); 192 if (error = ttysleep(tp, (caddr_t)&tp->t_canq, 193 TTIPRI | PCATCH, ttyin, 0)) 194 return (error); 195 goto again; 196 } 197 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 198 if (ureadc(getc(&tp->t_canq), uio) < 0) { 199 error = EFAULT; 200 break; 201 } 202 if (tp->t_canq.c_cc == 1) 203 (void) getc(&tp->t_canq); 204 if (tp->t_canq.c_cc) 205 return (error); 206 } else 207 if (tp->t_oproc) 208 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 209 ptcwakeup(tp, FWRITE); 210 return (error); 211 } 212 213 /* 214 * Write to pseudo-tty. 215 * Wakeups of controlling tty will happen 216 * indirectly, when tty driver calls ptsstart. 217 */ 218 ptswrite(dev, uio, flag) 219 dev_t dev; 220 struct uio *uio; 221 int flag; 222 { 223 register struct tty *tp; 224 225 tp = pt_tty[minor(dev)]; 226 if (tp->t_oproc == 0) 227 return (EIO); 228 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 229 } 230 231 /* 232 * Start output on pseudo-tty. 233 * Wake up process selecting or sleeping for input from controlling tty. 234 */ 235 void 236 ptsstart(tp) 237 struct tty *tp; 238 { 239 register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 240 241 if (tp->t_state & TS_TTSTOP) 242 return; 243 if (pti->pt_flags & PF_STOPPED) { 244 pti->pt_flags &= ~PF_STOPPED; 245 pti->pt_send = TIOCPKT_START; 246 } 247 ptcwakeup(tp, FREAD); 248 } 249 250 ptcwakeup(tp, flag) 251 struct tty *tp; 252 int flag; 253 { 254 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 255 256 if (flag & FREAD) { 257 selwakeup(&pti->pt_selr); 258 wakeup((caddr_t)&tp->t_outq.c_cf); 259 } 260 if (flag & FWRITE) { 261 selwakeup(&pti->pt_selw); 262 wakeup((caddr_t)&tp->t_rawq.c_cf); 263 } 264 } 265 266 int ptcopen __P((dev_t, int, int, struct proc *)); 267 268 /*ARGSUSED*/ 269 int 270 ptcopen(dev, flag, devtype, p) 271 dev_t dev; 272 int flag, devtype; 273 struct proc *p; 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 int 297 ptcclose(dev) 298 dev_t dev; 299 { 300 register struct tty *tp; 301 302 tp = pt_tty[minor(dev)]; 303 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 304 tp->t_state &= ~TS_CARR_ON; 305 tp->t_oproc = 0; /* mark closed */ 306 return (0); 307 } 308 309 ptcread(dev, uio, flag) 310 dev_t dev; 311 struct uio *uio; 312 int flag; 313 { 314 register struct tty *tp = pt_tty[minor(dev)]; 315 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 316 char buf[BUFSIZ]; 317 int error = 0, cc; 318 319 /* 320 * We want to block until the slave 321 * is open, and there's something to read; 322 * but if we lost the slave or we're NBIO, 323 * then return the appropriate error instead. 324 */ 325 for (;;) { 326 if (tp->t_state&TS_ISOPEN) { 327 if (pti->pt_flags&PF_PKT && pti->pt_send) { 328 error = ureadc((int)pti->pt_send, uio); 329 if (error) 330 return (error); 331 if (pti->pt_send & TIOCPKT_IOCTL) { 332 cc = min(uio->uio_resid, 333 sizeof(tp->t_termios)); 334 uiomove(&tp->t_termios, cc, uio); 335 } 336 pti->pt_send = 0; 337 return (0); 338 } 339 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 340 error = ureadc((int)pti->pt_ucntl, uio); 341 if (error) 342 return (error); 343 pti->pt_ucntl = 0; 344 return (0); 345 } 346 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 347 break; 348 } 349 if ((tp->t_state&TS_CARR_ON) == 0) 350 return (0); /* EOF */ 351 if (flag & IO_NDELAY) 352 return (EWOULDBLOCK); 353 if (error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH, 354 ttyin, 0)) 355 return (error); 356 } 357 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 358 error = ureadc(0, uio); 359 while (uio->uio_resid > 0 && error == 0) { 360 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 361 if (cc <= 0) 362 break; 363 error = uiomove(buf, cc, uio); 364 } 365 if (tp->t_outq.c_cc <= tp->t_lowat) { 366 if (tp->t_state&TS_ASLEEP) { 367 tp->t_state &= ~TS_ASLEEP; 368 wakeup((caddr_t)&tp->t_outq); 369 } 370 selwakeup(&tp->t_wsel); 371 } 372 return (error); 373 } 374 375 void 376 ptsstop(tp, flush) 377 register struct tty *tp; 378 int flush; 379 { 380 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 381 int flag; 382 383 /* note: FLUSHREAD and FLUSHWRITE already ok */ 384 if (flush == 0) { 385 flush = TIOCPKT_STOP; 386 pti->pt_flags |= PF_STOPPED; 387 } else 388 pti->pt_flags &= ~PF_STOPPED; 389 pti->pt_send |= flush; 390 /* change of perspective */ 391 flag = 0; 392 if (flush & FREAD) 393 flag |= FWRITE; 394 if (flush & FWRITE) 395 flag |= FREAD; 396 ptcwakeup(tp, flag); 397 } 398 399 ptcselect(dev, rw, p) 400 dev_t dev; 401 int rw; 402 struct proc *p; 403 { 404 register struct tty *tp = pt_tty[minor(dev)]; 405 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 406 int s; 407 408 if ((tp->t_state&TS_CARR_ON) == 0) 409 return (1); 410 switch (rw) { 411 412 case FREAD: 413 /* 414 * Need to block timeouts (ttrstart). 415 */ 416 s = spltty(); 417 if ((tp->t_state&TS_ISOPEN) && 418 tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) { 419 splx(s); 420 return (1); 421 } 422 splx(s); 423 /* FALLTHROUGH */ 424 425 case 0: /* exceptional */ 426 if ((tp->t_state&TS_ISOPEN) && 427 (pti->pt_flags&PF_PKT && pti->pt_send || 428 pti->pt_flags&PF_UCNTL && pti->pt_ucntl)) 429 return (1); 430 selrecord(p, &pti->pt_selr); 431 break; 432 433 434 case FWRITE: 435 if (tp->t_state&TS_ISOPEN) { 436 if (pti->pt_flags & PF_REMOTE) { 437 if (tp->t_canq.c_cc == 0) 438 return (1); 439 } else { 440 if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) 441 return (1); 442 if (tp->t_canq.c_cc == 0 && (tp->t_iflag&ICANON)) 443 return (1); 444 } 445 } 446 selrecord(p, &pti->pt_selw); 447 break; 448 449 } 450 return (0); 451 } 452 453 ptcwrite(dev, uio, flag) 454 dev_t dev; 455 register struct uio *uio; 456 int flag; 457 { 458 register struct tty *tp = pt_tty[minor(dev)]; 459 register u_char *cp; 460 register int cc = 0; 461 u_char locbuf[BUFSIZ]; 462 int cnt = 0; 463 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 464 int error = 0; 465 466 again: 467 if ((tp->t_state&TS_ISOPEN) == 0) 468 goto block; 469 if (pti->pt_flags & PF_REMOTE) { 470 if (tp->t_canq.c_cc) 471 goto block; 472 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 473 if (cc == 0) { 474 cc = min(uio->uio_resid, BUFSIZ); 475 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 476 cp = locbuf; 477 error = uiomove((caddr_t)cp, cc, uio); 478 if (error) 479 return (error); 480 /* check again for safety */ 481 if ((tp->t_state&TS_ISOPEN) == 0) 482 return (EIO); 483 } 484 if (cc) 485 (void) b_to_q((char *)cp, cc, &tp->t_canq); 486 cc = 0; 487 } 488 (void) putc(0, &tp->t_canq); 489 ttwakeup(tp); 490 wakeup((caddr_t)&tp->t_canq); 491 return (0); 492 } 493 while (uio->uio_resid > 0) { 494 if (cc == 0) { 495 cc = min(uio->uio_resid, BUFSIZ); 496 cp = locbuf; 497 error = uiomove((caddr_t)cp, cc, uio); 498 if (error) 499 return (error); 500 /* check again for safety */ 501 if ((tp->t_state&TS_ISOPEN) == 0) 502 return (EIO); 503 } 504 while (cc > 0) { 505 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 506 (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 507 wakeup((caddr_t)&tp->t_rawq); 508 goto block; 509 } 510 (*linesw[tp->t_line].l_rint)(*cp++, tp); 511 cnt++; 512 cc--; 513 } 514 cc = 0; 515 } 516 return (0); 517 block: 518 /* 519 * Come here to wait for slave to open, for space 520 * in outq, or space in rawq. 521 */ 522 if ((tp->t_state&TS_CARR_ON) == 0) 523 return (EIO); 524 if (flag & IO_NDELAY) { 525 /* adjust for data copied in but not written */ 526 uio->uio_resid += cc; 527 if (cnt == 0) 528 return (EWOULDBLOCK); 529 return (0); 530 } 531 if (error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH, 532 ttyout, 0)) { 533 /* adjust for data copied in but not written */ 534 uio->uio_resid += cc; 535 return (error); 536 } 537 goto again; 538 } 539 540 /*ARGSUSED*/ 541 ptyioctl(dev, cmd, data, flag, p) 542 dev_t dev; 543 u_long cmd; 544 caddr_t data; 545 int flag; 546 struct proc *p; 547 { 548 register struct tty *tp = pt_tty[minor(dev)]; 549 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 550 register u_char *cc = tp->t_cc; 551 int stop, error; 552 553 /* 554 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 555 * ttywflush(tp) will hang if there are characters in the outq. 556 */ 557 if (cmd == TIOCEXT) { 558 /* 559 * When the EXTPROC bit is being toggled, we need 560 * to send an TIOCPKT_IOCTL if the packet driver 561 * is turned on. 562 */ 563 if (*(int *)data) { 564 if (pti->pt_flags & PF_PKT) { 565 pti->pt_send |= TIOCPKT_IOCTL; 566 ptcwakeup(tp, FREAD); 567 } 568 tp->t_lflag |= EXTPROC; 569 } else { 570 if ((tp->t_state & EXTPROC) && 571 (pti->pt_flags & PF_PKT)) { 572 pti->pt_send |= TIOCPKT_IOCTL; 573 ptcwakeup(tp, FREAD); 574 } 575 tp->t_lflag &= ~EXTPROC; 576 } 577 return(0); 578 } else 579 if (cdevsw[major(dev)].d_open == ptcopen) 580 switch (cmd) { 581 582 case TIOCGPGRP: 583 /* 584 * We aviod calling ttioctl on the controller since, 585 * in that case, tp must be the controlling terminal. 586 */ 587 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 588 return (0); 589 590 case TIOCPKT: 591 if (*(int *)data) { 592 if (pti->pt_flags & PF_UCNTL) 593 return (EINVAL); 594 pti->pt_flags |= PF_PKT; 595 } else 596 pti->pt_flags &= ~PF_PKT; 597 return (0); 598 599 case TIOCUCNTL: 600 if (*(int *)data) { 601 if (pti->pt_flags & PF_PKT) 602 return (EINVAL); 603 pti->pt_flags |= PF_UCNTL; 604 } else 605 pti->pt_flags &= ~PF_UCNTL; 606 return (0); 607 608 case TIOCREMOTE: 609 if (*(int *)data) 610 pti->pt_flags |= PF_REMOTE; 611 else 612 pti->pt_flags &= ~PF_REMOTE; 613 ttyflush(tp, FREAD|FWRITE); 614 return (0); 615 616 #ifdef COMPAT_43 617 case TIOCSETP: 618 case TIOCSETN: 619 #endif 620 case TIOCSETD: 621 case TIOCSETA: 622 case TIOCSETAW: 623 case TIOCSETAF: 624 ndflush(&tp->t_outq, tp->t_outq.c_cc); 625 break; 626 627 case TIOCSIG: 628 if (*(unsigned int *)data >= NSIG) 629 return(EINVAL); 630 if ((tp->t_lflag&NOFLSH) == 0) 631 ttyflush(tp, FREAD|FWRITE); 632 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 633 if ((*(unsigned int *)data == SIGINFO) && 634 ((tp->t_lflag&NOKERNINFO) == 0)) 635 ttyinfo(tp); 636 return(0); 637 } 638 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 639 if (error < 0) 640 error = ttioctl(tp, cmd, data, flag, p); 641 if (error < 0) { 642 if (pti->pt_flags & PF_UCNTL && 643 (cmd & ~0xff) == UIOCCMD(0)) { 644 if (cmd & 0xff) { 645 pti->pt_ucntl = (u_char)cmd; 646 ptcwakeup(tp, FREAD); 647 } 648 return (0); 649 } 650 error = ENOTTY; 651 } 652 /* 653 * If external processing and packet mode send ioctl packet. 654 */ 655 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 656 switch(cmd) { 657 case TIOCSETA: 658 case TIOCSETAW: 659 case TIOCSETAF: 660 #ifdef COMPAT_43 661 case TIOCSETP: 662 case TIOCSETN: 663 #endif 664 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 665 case TIOCSETC: 666 case TIOCSLTC: 667 case TIOCLBIS: 668 case TIOCLBIC: 669 case TIOCLSET: 670 #endif 671 pti->pt_send |= TIOCPKT_IOCTL; 672 ptcwakeup(tp, FREAD); 673 default: 674 break; 675 } 676 } 677 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 678 && CCEQ(cc[VSTART], CTRL('q')); 679 if (pti->pt_flags & PF_NOSTOP) { 680 if (stop) { 681 pti->pt_send &= ~TIOCPKT_NOSTOP; 682 pti->pt_send |= TIOCPKT_DOSTOP; 683 pti->pt_flags &= ~PF_NOSTOP; 684 ptcwakeup(tp, FREAD); 685 } 686 } else { 687 if (!stop) { 688 pti->pt_send &= ~TIOCPKT_DOSTOP; 689 pti->pt_send |= TIOCPKT_NOSTOP; 690 pti->pt_flags |= PF_NOSTOP; 691 ptcwakeup(tp, FREAD); 692 } 693 } 694 return (error); 695 } 696
Indexes created Mon Sep 22 13:09:51 GMT 2025