pty.c revision 7730
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 * @(#)tty_pty.c 8.2 (Berkeley) 9/23/93 34 * $Id: tty_pty.c,v 1.9 1995/04/09 22:28:24 ache 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#include <sys/signalvar.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 */ 66struct tty pt_tty[NPTY]; /* XXX */ 67struct 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 */ 73int 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 81void ptsstop __P((struct tty *, int)); 82void ptcwakeup __P((struct tty *, int)); 83 84/* 85 * Establish n (or default if n is 1) ptys in the system. 86 * 87 * XXX cdevsw & pstat require the array `pty[]' to be an array 88 */ 89void 90ptyattach(n) 91 int n; 92{ 93#ifdef notyet 94 char *mem; 95 register u_long ntb; 96#define DEFAULT_NPTY 32 97 98 /* maybe should allow 0 => none? */ 99 if (n <= 1) 100 n = DEFAULT_NPTY; 101 ntb = n * sizeof(struct tty); 102 mem = malloc(ntb + ALIGNBYTES + n * sizeof(struct pt_ioctl), 103 M_DEVBUF, M_WAITOK); 104 pt_tty = (struct tty *)mem; 105 mem = (char *)ALIGN(mem + ntb); 106 pt_ioctl = (struct pt_ioctl *)mem; 107 npty = n; 108#endif 109} 110 111/*ARGSUSED*/ 112int 113ptsopen(dev, flag, devtype, p) 114 dev_t dev; 115 int flag, devtype; 116 struct proc *p; 117{ 118 register struct tty *tp; 119 int error; 120 121 if (minor(dev) >= npty) 122 return (ENXIO); 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 error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH, 142 ttopen, 0); 143 if (error) 144 return (error); 145 } 146 error = (*linesw[tp->t_line].l_open)(dev, tp); 147 if (error == 0) 148 ptcwakeup(tp, FREAD|FWRITE); 149 return (error); 150} 151 152int 153ptsclose(dev, flag, mode, p) 154 dev_t dev; 155 int flag, mode; 156 struct proc *p; 157{ 158 register struct tty *tp; 159 int err; 160 161 tp = &pt_tty[minor(dev)]; 162 err = (*linesw[tp->t_line].l_close)(tp, flag); 163 ptsstop(tp, FREAD|FWRITE); 164 (void) ttyclose(tp); 165 return (err); 166} 167 168int 169ptsread(dev, uio, flag) 170 dev_t dev; 171 struct uio *uio; 172 int flag; 173{ 174 struct proc *p = curproc; 175 register struct tty *tp = &pt_tty[minor(dev)]; 176 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 177 int error = 0; 178 179again: 180 if (pti->pt_flags & PF_REMOTE) { 181 while (isbackground(p, tp)) { 182 if ((p->p_sigignore & sigmask(SIGTTIN)) || 183 (p->p_sigmask & sigmask(SIGTTIN)) || 184 p->p_pgrp->pg_jobc == 0 || 185 p->p_flag & P_PPWAIT) 186 return (EIO); 187 pgsignal(p->p_pgrp, SIGTTIN, 1); 188 error = ttysleep(tp, (caddr_t)&lbolt, 189 TTIPRI | PCATCH, ttybg, 0); 190 if (error) 191 return (error); 192 } 193 if (tp->t_canq.c_cc == 0) { 194 if (flag & IO_NDELAY) 195 return (EWOULDBLOCK); 196 error = ttysleep(tp, (caddr_t)&tp->t_canq, 197 TTIPRI | PCATCH, ttyin, 0); 198 if (error) 199 return (error); 200 goto again; 201 } 202 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 203 if (ureadc(getc(&tp->t_canq), uio) < 0) { 204 error = EFAULT; 205 break; 206 } 207 if (tp->t_canq.c_cc == 1) 208 (void) getc(&tp->t_canq); 209 if (tp->t_canq.c_cc) 210 return (error); 211 } else 212 if (tp->t_oproc) 213 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 214 ptcwakeup(tp, FWRITE); 215 return (error); 216} 217 218/* 219 * Write to pseudo-tty. 220 * Wakeups of controlling tty will happen 221 * indirectly, when tty driver calls ptsstart. 222 */ 223int 224ptswrite(dev, uio, flag) 225 dev_t dev; 226 struct uio *uio; 227 int flag; 228{ 229 register struct tty *tp; 230 231 tp = &pt_tty[minor(dev)]; 232 if (tp->t_oproc == 0) 233 return (EIO); 234 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 235} 236 237/* 238 * Start output on pseudo-tty. 239 * Wake up process selecting or sleeping for input from controlling tty. 240 */ 241void 242ptsstart(tp) 243 struct tty *tp; 244{ 245 register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 246 247 if (tp->t_state & TS_TTSTOP) 248 return; 249 if (pti->pt_flags & PF_STOPPED) { 250 pti->pt_flags &= ~PF_STOPPED; 251 pti->pt_send = TIOCPKT_START; 252 } 253 ptcwakeup(tp, FREAD); 254} 255 256void 257ptcwakeup(tp, flag) 258 struct tty *tp; 259 int flag; 260{ 261 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 262 263 if (flag & FREAD) { 264 selwakeup(&pti->pt_selr); 265 wakeup((caddr_t)&tp->t_outq.c_cf); 266 } 267 if (flag & FWRITE) { 268 selwakeup(&pti->pt_selw); 269 wakeup((caddr_t)&tp->t_rawq.c_cl); 270 } 271} 272 273/*ARGSUSED*/ 274#ifdef __STDC__ 275int 276ptcopen(dev_t dev, int flag, int devtype, struct proc *p) 277#else 278int 279ptcopen(dev, flag, devtype, p) 280 dev_t dev; 281 int flag, devtype; 282 struct proc *p; 283#endif 284{ 285 register struct tty *tp; 286 struct pt_ioctl *pti; 287 288 if (minor(dev) >= npty) 289 return (ENXIO); 290 tp = &pt_tty[minor(dev)]; 291 if (tp->t_oproc) 292 return (EIO); 293 tp->t_oproc = ptsstart; 294#ifdef sun4c 295 tp->t_stop = ptsstop; 296#endif 297 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 298 tp->t_lflag &= ~EXTPROC; 299 pti = &pt_ioctl[minor(dev)]; 300 pti->pt_flags = 0; 301 pti->pt_send = 0; 302 pti->pt_ucntl = 0; 303 return (0); 304} 305 306int 307ptcclose(dev) 308 dev_t dev; 309{ 310 register struct tty *tp; 311 312 tp = &pt_tty[minor(dev)]; 313 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 314 tp->t_state &= ~TS_CARR_ON; 315 tp->t_oproc = 0; /* mark closed */ 316 tp->t_session = 0; 317 return (0); 318} 319 320int 321ptcread(dev, uio, flag) 322 dev_t dev; 323 struct uio *uio; 324 int flag; 325{ 326 register struct tty *tp = &pt_tty[minor(dev)]; 327 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 328 char buf[BUFSIZ]; 329 int error = 0, cc; 330 331 /* 332 * We want to block until the slave 333 * is open, and there's something to read; 334 * but if we lost the slave or we're NBIO, 335 * then return the appropriate error instead. 336 */ 337 for (;;) { 338 if (tp->t_state&TS_ISOPEN) { 339 if (pti->pt_flags&PF_PKT && pti->pt_send) { 340 error = ureadc((int)pti->pt_send, uio); 341 if (error) 342 return (error); 343 if (pti->pt_send & TIOCPKT_IOCTL) { 344 cc = min(uio->uio_resid, 345 sizeof(tp->t_termios)); 346 uiomove((caddr_t)&tp->t_termios, cc, 347 uio); 348 } 349 pti->pt_send = 0; 350 return (0); 351 } 352 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 353 error = ureadc((int)pti->pt_ucntl, uio); 354 if (error) 355 return (error); 356 pti->pt_ucntl = 0; 357 return (0); 358 } 359 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 360 break; 361 } 362 if ((tp->t_state&TS_CARR_ON) == 0) 363 return (0); /* EOF */ 364 if (flag & IO_NDELAY) 365 return (EWOULDBLOCK); 366 error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH, 367 ttyin, 0); 368 if (error) 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 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 375 if (cc <= 0) 376 break; 377 error = uiomove(buf, cc, uio); 378 } 379 if (tp->t_outq.c_cc <= tp->t_lowat) { 380 if (tp->t_state&TS_ASLEEP) { 381 tp->t_state &= ~TS_ASLEEP; 382 wakeup((caddr_t)&tp->t_outq); 383 } 384 selwakeup(&tp->t_wsel); 385 } 386 return (error); 387} 388 389void 390ptsstop(tp, flush) 391 register struct tty *tp; 392 int flush; 393{ 394 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 395 int flag; 396 397 /* note: FLUSHREAD and FLUSHWRITE already ok */ 398 if (flush == 0) { 399 flush = TIOCPKT_STOP; 400 pti->pt_flags |= PF_STOPPED; 401 } else 402 pti->pt_flags &= ~PF_STOPPED; 403 pti->pt_send |= flush; 404 /* change of perspective */ 405 flag = 0; 406 if (flush & FREAD) 407 flag |= FWRITE; 408 if (flush & FWRITE) 409 flag |= FREAD; 410 ptcwakeup(tp, flag); 411} 412 413int 414ptcselect(dev, rw, p) 415 dev_t dev; 416 int rw; 417 struct proc *p; 418{ 419 register struct tty *tp = &pt_tty[minor(dev)]; 420 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 421 int s; 422 423 if ((tp->t_state&TS_CARR_ON) == 0) 424 return (1); 425 switch (rw) { 426 427 case FREAD: 428 /* 429 * Need to block timeouts (ttrstart). 430 */ 431 s = spltty(); 432 if ((tp->t_state&TS_ISOPEN) && 433 tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) { 434 splx(s); 435 return (1); 436 } 437 splx(s); 438 /* FALLTHROUGH */ 439 440 case 0: /* exceptional */ 441 if ((tp->t_state&TS_ISOPEN) && 442 ((pti->pt_flags&PF_PKT && pti->pt_send) || 443 (pti->pt_flags&PF_UCNTL && pti->pt_ucntl))) 444 return (1); 445 selrecord(p, &pti->pt_selr); 446 break; 447 448 449 case FWRITE: 450 if (tp->t_state&TS_ISOPEN) { 451 if (pti->pt_flags & PF_REMOTE) { 452 if (tp->t_canq.c_cc == 0) 453 return (1); 454 } else { 455 if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) 456 return (1); 457 if (tp->t_canq.c_cc == 0 && (tp->t_iflag&ICANON)) 458 return (1); 459 } 460 } 461 selrecord(p, &pti->pt_selw); 462 break; 463 464 } 465 return (0); 466} 467 468int 469ptcwrite(dev, uio, flag) 470 dev_t dev; 471 register struct uio *uio; 472 int flag; 473{ 474 register struct tty *tp = &pt_tty[minor(dev)]; 475 register u_char *cp = 0; 476 register int cc = 0; 477 u_char locbuf[BUFSIZ]; 478 int cnt = 0; 479 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 480 int error = 0; 481 482again: 483 if ((tp->t_state&TS_ISOPEN) == 0) 484 goto block; 485 if (pti->pt_flags & PF_REMOTE) { 486 if (tp->t_canq.c_cc) 487 goto block; 488 while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { 489 if (cc == 0) { 490 cc = min(uio->uio_resid, BUFSIZ); 491 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 492 cp = locbuf; 493 error = uiomove((caddr_t)cp, cc, uio); 494 if (error) 495 return (error); 496 /* check again for safety */ 497 if ((tp->t_state&TS_ISOPEN) == 0) 498 return (EIO); 499 } 500 if (cc) 501 (void) b_to_q((char *)cp, cc, &tp->t_canq); 502 cc = 0; 503 } 504 (void) putc(0, &tp->t_canq); 505 ttwakeup(tp); 506 wakeup((caddr_t)&tp->t_canq); 507 return (0); 508 } 509 while (uio->uio_resid > 0) { 510 if (cc == 0) { 511 cc = min(uio->uio_resid, BUFSIZ); 512 cp = locbuf; 513 error = uiomove((caddr_t)cp, cc, uio); 514 if (error) 515 return (error); 516 /* check again for safety */ 517 if ((tp->t_state&TS_ISOPEN) == 0) 518 return (EIO); 519 } 520 while (cc > 0) { 521 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 522 (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 523 wakeup((caddr_t)&tp->t_rawq); 524 goto block; 525 } 526 (*linesw[tp->t_line].l_rint)(*cp++, tp); 527 cnt++; 528 cc--; 529 } 530 cc = 0; 531 } 532 return (0); 533block: 534 /* 535 * Come here to wait for slave to open, for space 536 * in outq, or space in rawq. 537 */ 538 if ((tp->t_state&TS_CARR_ON) == 0) 539 return (EIO); 540 if (flag & IO_NDELAY) { 541 /* adjust for data copied in but not written */ 542 uio->uio_resid += cc; 543 if (cnt == 0) 544 return (EWOULDBLOCK); 545 return (0); 546 } 547 error = tsleep((caddr_t)&tp->t_rawq.c_cl, TTOPRI | PCATCH, ttyout, 0); 548 if (error) { 549 /* adjust for data copied in but not written */ 550 uio->uio_resid += cc; 551 return (error); 552 } 553 goto again; 554} 555 556struct tty * 557ptydevtotty(dev) 558 dev_t dev; 559{ 560 if (minor(dev) >= npty) 561 return (NULL); 562 563 return &pt_tty[minor(dev)]; 564} 565 566/*ARGSUSED*/ 567int 568ptyioctl(dev, cmd, data, flag, p) 569 dev_t dev; 570 int cmd; 571 caddr_t data; 572 int flag; 573 struct proc *p; 574{ 575 register struct tty *tp = &pt_tty[minor(dev)]; 576 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 577 register u_char *cc = tp->t_cc; 578 int stop, error; 579 580 /* 581 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 582 * ttywflush(tp) will hang if there are characters in the outq. 583 */ 584 if (cmd == TIOCEXT) { 585 /* 586 * When the EXTPROC bit is being toggled, we need 587 * to send an TIOCPKT_IOCTL if the packet driver 588 * is turned on. 589 */ 590 if (*(int *)data) { 591 if (pti->pt_flags & PF_PKT) { 592 pti->pt_send |= TIOCPKT_IOCTL; 593 ptcwakeup(tp, FREAD); 594 } 595 tp->t_lflag |= EXTPROC; 596 } else { 597 if ((tp->t_state & EXTPROC) && 598 (pti->pt_flags & PF_PKT)) { 599 pti->pt_send |= TIOCPKT_IOCTL; 600 ptcwakeup(tp, FREAD); 601 } 602 tp->t_lflag &= ~EXTPROC; 603 } 604 return(0); 605 } else 606 if (cdevsw[major(dev)].d_open == ptcopen) 607 switch (cmd) { 608 609 case TIOCGPGRP: 610 /* 611 * We aviod calling ttioctl on the controller since, 612 * in that case, tp must be the controlling terminal. 613 */ 614 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 615 return (0); 616 617 case TIOCPKT: 618 if (*(int *)data) { 619 if (pti->pt_flags & PF_UCNTL) 620 return (EINVAL); 621 pti->pt_flags |= PF_PKT; 622 } else 623 pti->pt_flags &= ~PF_PKT; 624 return (0); 625 626 case TIOCUCNTL: 627 if (*(int *)data) { 628 if (pti->pt_flags & PF_PKT) 629 return (EINVAL); 630 pti->pt_flags |= PF_UCNTL; 631 } else 632 pti->pt_flags &= ~PF_UCNTL; 633 return (0); 634 635 case TIOCREMOTE: 636 if (*(int *)data) 637 pti->pt_flags |= PF_REMOTE; 638 else 639 pti->pt_flags &= ~PF_REMOTE; 640 ttyflush(tp, FREAD|FWRITE); 641 return (0); 642 643#ifdef COMPAT_43 644 case TIOCSETP: 645 case TIOCSETN: 646#endif 647 case TIOCSETD: 648 case TIOCSETA: 649 case TIOCSETAW: 650 case TIOCSETAF: 651 ndflush(&tp->t_outq, tp->t_outq.c_cc); 652 break; 653 654 case TIOCSIG: 655 if (*(unsigned int *)data >= NSIG) 656 return(EINVAL); 657 if ((tp->t_lflag&NOFLSH) == 0) 658 ttyflush(tp, FREAD|FWRITE); 659 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 660 if ((*(unsigned int *)data == SIGINFO) && 661 ((tp->t_lflag&NOKERNINFO) == 0)) 662 ttyinfo(tp); 663 return(0); 664 } 665 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 666 if (error < 0) 667 error = ttioctl(tp, cmd, data, flag); 668 if (error < 0) { 669 if (pti->pt_flags & PF_UCNTL && 670 (cmd & ~0xff) == UIOCCMD(0)) { 671 if (cmd & 0xff) { 672 pti->pt_ucntl = (u_char)cmd; 673 ptcwakeup(tp, FREAD); 674 } 675 return (0); 676 } 677 error = ENOTTY; 678 } 679 /* 680 * If external processing and packet mode send ioctl packet. 681 */ 682 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 683 switch(cmd) { 684 case TIOCSETA: 685 case TIOCSETAW: 686 case TIOCSETAF: 687#ifdef COMPAT_43 688 case TIOCSETP: 689 case TIOCSETN: 690#endif 691#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 692 case TIOCSETC: 693 case TIOCSLTC: 694 case TIOCLBIS: 695 case TIOCLBIC: 696 case TIOCLSET: 697#endif 698 pti->pt_send |= TIOCPKT_IOCTL; 699 ptcwakeup(tp, FREAD); 700 default: 701 break; 702 } 703 } 704 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 705 && CCEQ(cc[VSTART], CTRL('q')); 706 if (pti->pt_flags & PF_NOSTOP) { 707 if (stop) { 708 pti->pt_send &= ~TIOCPKT_NOSTOP; 709 pti->pt_send |= TIOCPKT_DOSTOP; 710 pti->pt_flags &= ~PF_NOSTOP; 711 ptcwakeup(tp, FREAD); 712 } 713 } else { 714 if (!stop) { 715 pti->pt_send &= ~TIOCPKT_DOSTOP; 716 pti->pt_send |= TIOCPKT_NOSTOP; 717 pti->pt_flags |= PF_NOSTOP; 718 ptcwakeup(tp, FREAD); 719 } 720 } 721 return (error); 722} 723