pty.c revision 49536
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 8.4 (Berkeley) 2/20/95 34 * $Id: tty_pty.c,v 1.61 1999/05/31 11:27:38 phk Exp $ 35 */ 36 37/* 38 * Pseudo-teletype Driver 39 * (Actually two drivers, requiring two entries in 'cdevsw') 40 */ 41#include "pty.h" /* XXX */ 42#include "opt_compat.h" 43 44#include <sys/param.h> 45#include <sys/systm.h> 46#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 47#include <sys/ioctl_compat.h> 48#endif 49#include <sys/proc.h> 50#include <sys/tty.h> 51#include <sys/conf.h> 52#include <sys/fcntl.h> 53#include <sys/poll.h> 54#include <sys/kernel.h> 55#include <sys/vnode.h> 56#include <sys/signalvar.h> 57#include <sys/malloc.h> 58 59MALLOC_DEFINE(M_PTY, "ptys", "pty data structures"); 60 61static void ptsstart __P((struct tty *tp)); 62static void ptcwakeup __P((struct tty *tp, int flag)); 63static void ptyinit __P((int n)); 64 65static d_open_t ptsopen; 66static d_close_t ptsclose; 67static d_read_t ptsread; 68static d_write_t ptswrite; 69static d_ioctl_t ptyioctl; 70static d_stop_t ptsstop; 71static d_devtotty_t ptydevtotty; 72static d_open_t ptcopen; 73static d_close_t ptcclose; 74static d_read_t ptcread; 75static d_write_t ptcwrite; 76static d_poll_t ptcpoll; 77 78#define CDEV_MAJOR_S 5 79static struct cdevsw pts_cdevsw = { 80 /* open */ ptsopen, 81 /* close */ ptsclose, 82 /* read */ ptsread, 83 /* write */ ptswrite, 84 /* ioctl */ ptyioctl, 85 /* stop */ ptsstop, 86 /* reset */ noreset, 87 /* devtotty */ ptydevtotty, 88 /* poll */ ttpoll, 89 /* mmap */ nommap, 90 /* strategy */ nostrategy, 91 /* name */ "pts", 92 /* parms */ noparms, 93 /* maj */ CDEV_MAJOR_S, 94 /* dump */ nodump, 95 /* psize */ nopsize, 96 /* flags */ D_TTY, 97 /* maxio */ 0, 98 /* bmaj */ -1 99}; 100 101#define CDEV_MAJOR_C 6 102static struct cdevsw ptc_cdevsw = { 103 /* open */ ptcopen, 104 /* close */ ptcclose, 105 /* read */ ptcread, 106 /* write */ ptcwrite, 107 /* ioctl */ ptyioctl, 108 /* stop */ nostop, 109 /* reset */ noreset, 110 /* devtotty */ ptydevtotty, 111 /* poll */ ptcpoll, 112 /* mmap */ nommap, 113 /* strategy */ nostrategy, 114 /* name */ "ptc", 115 /* parms */ noparms, 116 /* maj */ CDEV_MAJOR_C, 117 /* dump */ nodump, 118 /* psize */ nopsize, 119 /* flags */ D_TTY, 120 /* maxio */ 0, 121 /* bmaj */ -1 122}; 123 124#define BUFSIZ 100 /* Chunk size iomoved to/from user */ 125 126struct pt_ioctl { 127 int pt_flags; 128 struct selinfo pt_selr, pt_selw; 129 u_char pt_send; 130 u_char pt_ucntl; 131 struct tty pt_tty; 132}; 133 134#define PF_PKT 0x08 /* packet mode */ 135#define PF_STOPPED 0x10 /* user told stopped */ 136#define PF_REMOTE 0x20 /* remote and flow controlled input */ 137#define PF_NOSTOP 0x40 138#define PF_UCNTL 0x80 /* user control mode */ 139 140/* 141 * This function creates and initializes a pts/ptc pair 142 * 143 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 144 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 145 * 146 * XXX: define and add mapping of upper minor bits to allow more 147 * than 256 ptys. 148 */ 149static void 150ptyinit(n) 151 int n; 152{ 153 dev_t devs, devc; 154 char *names = "pqrsPQRS"; 155 struct pt_ioctl *pt; 156 157 /* For now we only map the lower 8 bits of the minor */ 158 if (n & ~0xff) 159 return; 160 161 devs = make_dev(&pts_cdevsw, n, 162 0, 0, 0666, "tty%c%r", names[n / 32], n % 32); 163 devc = make_dev(&ptc_cdevsw, n, 164 0, 0, 0666, "pty%c%r", names[n / 32], n % 32); 165 166 pt = malloc(sizeof(*pt), M_PTY, M_WAITOK); 167 bzero(pt, sizeof(*pt)); 168 devs->si_drv1 = devc->si_drv1 = pt; 169 devs->si_tty_tty = devc->si_tty_tty = &pt->pt_tty; 170} 171 172/*ARGSUSED*/ 173static int 174ptsopen(dev, flag, devtype, p) 175 dev_t dev; 176 int flag, devtype; 177 struct proc *p; 178{ 179 register struct tty *tp; 180 int error; 181 182 if (!dev->si_drv1) 183 ptyinit(minor(dev)); 184 if (!dev->si_drv1) 185 return(ENXIO); 186 tp = dev->si_tty_tty; 187 if ((tp->t_state & TS_ISOPEN) == 0) { 188 ttychars(tp); /* Set up default chars */ 189 tp->t_iflag = TTYDEF_IFLAG; 190 tp->t_oflag = TTYDEF_OFLAG; 191 tp->t_lflag = TTYDEF_LFLAG; 192 tp->t_cflag = TTYDEF_CFLAG; 193 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 194 } else if (tp->t_state & TS_XCLUDE && suser(p)) 195 return (EBUSY); 196 if (tp->t_oproc) /* Ctrlr still around. */ 197 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 198 while ((tp->t_state & TS_CARR_ON) == 0) { 199 if (flag&FNONBLOCK) 200 break; 201 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 202 "ptsopn", 0); 203 if (error) 204 return (error); 205 } 206 error = (*linesw[tp->t_line].l_open)(dev, tp); 207 if (error == 0) 208 ptcwakeup(tp, FREAD|FWRITE); 209 return (error); 210} 211 212static int 213ptsclose(dev, flag, mode, p) 214 dev_t dev; 215 int flag, mode; 216 struct proc *p; 217{ 218 register struct tty *tp; 219 int err; 220 221 tp = dev->si_tty_tty; 222 err = (*linesw[tp->t_line].l_close)(tp, flag); 223 ptsstop(tp, FREAD|FWRITE); 224 (void) ttyclose(tp); 225 return (err); 226} 227 228static int 229ptsread(dev, uio, flag) 230 dev_t dev; 231 struct uio *uio; 232 int flag; 233{ 234 struct proc *p = curproc; 235 register struct tty *tp = dev->si_tty_tty; 236 register struct pt_ioctl *pti = dev->si_drv1; 237 int error = 0; 238 239again: 240 if (pti->pt_flags & PF_REMOTE) { 241 while (isbackground(p, tp)) { 242 if ((p->p_sigignore & sigmask(SIGTTIN)) || 243 (p->p_sigmask & sigmask(SIGTTIN)) || 244 p->p_pgrp->pg_jobc == 0 || 245 p->p_flag & P_PPWAIT) 246 return (EIO); 247 pgsignal(p->p_pgrp, SIGTTIN, 1); 248 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg", 249 0); 250 if (error) 251 return (error); 252 } 253 if (tp->t_canq.c_cc == 0) { 254 if (flag & IO_NDELAY) 255 return (EWOULDBLOCK); 256 error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, 257 "ptsin", 0); 258 if (error) 259 return (error); 260 goto again; 261 } 262 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 263 if (ureadc(getc(&tp->t_canq), uio) < 0) { 264 error = EFAULT; 265 break; 266 } 267 if (tp->t_canq.c_cc == 1) 268 (void) getc(&tp->t_canq); 269 if (tp->t_canq.c_cc) 270 return (error); 271 } else 272 if (tp->t_oproc) 273 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 274 ptcwakeup(tp, FWRITE); 275 return (error); 276} 277 278/* 279 * Write to pseudo-tty. 280 * Wakeups of controlling tty will happen 281 * indirectly, when tty driver calls ptsstart. 282 */ 283static int 284ptswrite(dev, uio, flag) 285 dev_t dev; 286 struct uio *uio; 287 int flag; 288{ 289 register struct tty *tp; 290 291 tp = dev->si_tty_tty; 292 if (tp->t_oproc == 0) 293 return (EIO); 294 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 295} 296 297/* 298 * Start output on pseudo-tty. 299 * Wake up process selecting or sleeping for input from controlling tty. 300 */ 301static void 302ptsstart(tp) 303 struct tty *tp; 304{ 305 register struct pt_ioctl *pti = tp->t_dev->si_drv1; 306 307 if (tp->t_state & TS_TTSTOP) 308 return; 309 if (pti->pt_flags & PF_STOPPED) { 310 pti->pt_flags &= ~PF_STOPPED; 311 pti->pt_send = TIOCPKT_START; 312 } 313 ptcwakeup(tp, FREAD); 314} 315 316static void 317ptcwakeup(tp, flag) 318 struct tty *tp; 319 int flag; 320{ 321 struct pt_ioctl *pti = tp->t_dev->si_drv1; 322 323 if (flag & FREAD) { 324 selwakeup(&pti->pt_selr); 325 wakeup(TSA_PTC_READ(tp)); 326 } 327 if (flag & FWRITE) { 328 selwakeup(&pti->pt_selw); 329 wakeup(TSA_PTC_WRITE(tp)); 330 } 331} 332 333static int 334ptcopen(dev, flag, devtype, p) 335 dev_t dev; 336 int flag, devtype; 337 struct proc *p; 338{ 339 register struct tty *tp; 340 struct pt_ioctl *pti; 341 342 if (!dev->si_drv1) 343 ptyinit(minor(dev)); 344 if (!dev->si_drv1) 345 return(ENXIO); 346 tp = dev->si_tty_tty; 347 if (tp->t_oproc) 348 return (EIO); 349 tp->t_oproc = ptsstart; 350 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 351 tp->t_lflag &= ~EXTPROC; 352 pti = dev->si_drv1; 353 pti->pt_flags = 0; 354 pti->pt_send = 0; 355 pti->pt_ucntl = 0; 356 return (0); 357} 358 359static int 360ptcclose(dev, flags, fmt, p) 361 dev_t dev; 362 int flags; 363 int fmt; 364 struct proc *p; 365{ 366 register struct tty *tp; 367 368 tp = dev->si_tty_tty; 369 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 370 371 /* 372 * XXX MDMBUF makes no sense for ptys but would inhibit the above 373 * l_modem(). CLOCAL makes sense but isn't supported. Special 374 * l_modem()s that ignore carrier drop make no sense for ptys but 375 * may be in use because other parts of the line discipline make 376 * sense for ptys. Recover by doing everything that a normal 377 * ttymodem() would have done except for sending a SIGHUP. 378 */ 379 if (tp->t_state & TS_ISOPEN) { 380 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 381 tp->t_state |= TS_ZOMBIE; 382 ttyflush(tp, FREAD | FWRITE); 383 } 384 385 tp->t_oproc = 0; /* mark closed */ 386 return (0); 387} 388 389static int 390ptcread(dev, uio, flag) 391 dev_t dev; 392 struct uio *uio; 393 int flag; 394{ 395 register struct tty *tp = dev->si_tty_tty; 396 struct pt_ioctl *pti = dev->si_drv1; 397 char buf[BUFSIZ]; 398 int error = 0, cc; 399 400 /* 401 * We want to block until the slave 402 * is open, and there's something to read; 403 * but if we lost the slave or we're NBIO, 404 * then return the appropriate error instead. 405 */ 406 for (;;) { 407 if (tp->t_state&TS_ISOPEN) { 408 if (pti->pt_flags&PF_PKT && pti->pt_send) { 409 error = ureadc((int)pti->pt_send, uio); 410 if (error) 411 return (error); 412 if (pti->pt_send & TIOCPKT_IOCTL) { 413 cc = min(uio->uio_resid, 414 sizeof(tp->t_termios)); 415 uiomove((caddr_t)&tp->t_termios, cc, 416 uio); 417 } 418 pti->pt_send = 0; 419 return (0); 420 } 421 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 422 error = ureadc((int)pti->pt_ucntl, uio); 423 if (error) 424 return (error); 425 pti->pt_ucntl = 0; 426 return (0); 427 } 428 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 429 break; 430 } 431 if ((tp->t_state & TS_CONNECTED) == 0) 432 return (0); /* EOF */ 433 if (flag & IO_NDELAY) 434 return (EWOULDBLOCK); 435 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 436 if (error) 437 return (error); 438 } 439 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 440 error = ureadc(0, uio); 441 while (uio->uio_resid > 0 && error == 0) { 442 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 443 if (cc <= 0) 444 break; 445 error = uiomove(buf, cc, uio); 446 } 447 ttwwakeup(tp); 448 return (error); 449} 450 451static void 452ptsstop(tp, flush) 453 register struct tty *tp; 454 int flush; 455{ 456 struct pt_ioctl *pti = tp->t_dev->si_drv1; 457 int flag; 458 459 /* note: FLUSHREAD and FLUSHWRITE already ok */ 460 if (flush == 0) { 461 flush = TIOCPKT_STOP; 462 pti->pt_flags |= PF_STOPPED; 463 } else 464 pti->pt_flags &= ~PF_STOPPED; 465 pti->pt_send |= flush; 466 /* change of perspective */ 467 flag = 0; 468 if (flush & FREAD) 469 flag |= FWRITE; 470 if (flush & FWRITE) 471 flag |= FREAD; 472 ptcwakeup(tp, flag); 473} 474 475static int 476ptcpoll(dev, events, p) 477 dev_t dev; 478 int events; 479 struct proc *p; 480{ 481 register struct tty *tp = dev->si_tty_tty; 482 struct pt_ioctl *pti = dev->si_drv1; 483 int revents = 0; 484 int s; 485 486 if ((tp->t_state & TS_CONNECTED) == 0) 487 return (seltrue(dev, events, p) | POLLHUP); 488 489 /* 490 * Need to block timeouts (ttrstart). 491 */ 492 s = spltty(); 493 494 if (events & (POLLIN | POLLRDNORM)) 495 if ((tp->t_state & TS_ISOPEN) && 496 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || 497 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 498 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 499 revents |= events & (POLLIN | POLLRDNORM); 500 501 if (events & (POLLOUT | POLLWRNORM)) 502 if (tp->t_state & TS_ISOPEN && 503 ((pti->pt_flags & PF_REMOTE) ? 504 (tp->t_canq.c_cc == 0) : 505 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 506 (tp->t_canq.c_cc == 0 && (tp->t_iflag & ICANON))))) 507 revents |= events & (POLLOUT | POLLWRNORM); 508 509 if (events & POLLHUP) 510 if ((tp->t_state & TS_CARR_ON) == 0) 511 revents |= POLLHUP; 512 513 if (revents == 0) { 514 if (events & (POLLIN | POLLRDNORM)) 515 selrecord(p, &pti->pt_selr); 516 517 if (events & (POLLOUT | POLLWRNORM)) 518 selrecord(p, &pti->pt_selw); 519 } 520 splx(s); 521 522 return (revents); 523} 524 525static int 526ptcwrite(dev, uio, flag) 527 dev_t dev; 528 register struct uio *uio; 529 int flag; 530{ 531 register struct tty *tp = dev->si_tty_tty; 532 register u_char *cp = 0; 533 register int cc = 0; 534 u_char locbuf[BUFSIZ]; 535 int cnt = 0; 536 struct pt_ioctl *pti = dev->si_drv1; 537 int error = 0; 538 539again: 540 if ((tp->t_state&TS_ISOPEN) == 0) 541 goto block; 542 if (pti->pt_flags & PF_REMOTE) { 543 if (tp->t_canq.c_cc) 544 goto block; 545 while ((uio->uio_resid > 0 || cc > 0) && 546 tp->t_canq.c_cc < TTYHOG - 1) { 547 if (cc == 0) { 548 cc = min(uio->uio_resid, BUFSIZ); 549 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 550 cp = locbuf; 551 error = uiomove((caddr_t)cp, cc, uio); 552 if (error) 553 return (error); 554 /* check again for safety */ 555 if ((tp->t_state & TS_ISOPEN) == 0) { 556 /* adjust as usual */ 557 uio->uio_resid += cc; 558 return (EIO); 559 } 560 } 561 if (cc > 0) { 562 cc = b_to_q((char *)cp, cc, &tp->t_canq); 563 /* 564 * XXX we don't guarantee that the canq size 565 * is >= TTYHOG, so the above b_to_q() may 566 * leave some bytes uncopied. However, space 567 * is guaranteed for the null terminator if 568 * we don't fail here since (TTYHOG - 1) is 569 * not a multiple of CBSIZE. 570 */ 571 if (cc > 0) 572 break; 573 } 574 } 575 /* adjust for data copied in but not written */ 576 uio->uio_resid += cc; 577 (void) putc(0, &tp->t_canq); 578 ttwakeup(tp); 579 wakeup(TSA_PTS_READ(tp)); 580 return (0); 581 } 582 while (uio->uio_resid > 0 || cc > 0) { 583 if (cc == 0) { 584 cc = min(uio->uio_resid, BUFSIZ); 585 cp = locbuf; 586 error = uiomove((caddr_t)cp, cc, uio); 587 if (error) 588 return (error); 589 /* check again for safety */ 590 if ((tp->t_state & TS_ISOPEN) == 0) { 591 /* adjust for data copied in but not written */ 592 uio->uio_resid += cc; 593 return (EIO); 594 } 595 } 596 while (cc > 0) { 597 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 598 (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 599 wakeup(TSA_HUP_OR_INPUT(tp)); 600 goto block; 601 } 602 (*linesw[tp->t_line].l_rint)(*cp++, tp); 603 cnt++; 604 cc--; 605 } 606 cc = 0; 607 } 608 return (0); 609block: 610 /* 611 * Come here to wait for slave to open, for space 612 * in outq, or space in rawq, or an empty canq. 613 */ 614 if ((tp->t_state & TS_CONNECTED) == 0) { 615 /* adjust for data copied in but not written */ 616 uio->uio_resid += cc; 617 return (EIO); 618 } 619 if (flag & IO_NDELAY) { 620 /* adjust for data copied in but not written */ 621 uio->uio_resid += cc; 622 if (cnt == 0) 623 return (EWOULDBLOCK); 624 return (0); 625 } 626 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); 627 if (error) { 628 /* adjust for data copied in but not written */ 629 uio->uio_resid += cc; 630 return (error); 631 } 632 goto again; 633} 634 635static struct tty * 636ptydevtotty(dev) 637 dev_t dev; 638{ 639 if (minor(dev) & ~0xff) 640 return (NULL); 641 642 return dev->si_tty_tty; 643} 644 645/*ARGSUSED*/ 646static int 647ptyioctl(dev, cmd, data, flag, p) 648 dev_t dev; 649 u_long cmd; 650 caddr_t data; 651 int flag; 652 struct proc *p; 653{ 654 register struct tty *tp = dev->si_tty_tty; 655 register struct pt_ioctl *pti = dev->si_drv1; 656 register u_char *cc = tp->t_cc; 657 int stop, error; 658 659 if (devsw(dev)->d_open == ptcopen) { 660 switch (cmd) { 661 662 case TIOCGPGRP: 663 /* 664 * We avoid calling ttioctl on the controller since, 665 * in that case, tp must be the controlling terminal. 666 */ 667 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 668 return (0); 669 670 case TIOCPKT: 671 if (*(int *)data) { 672 if (pti->pt_flags & PF_UCNTL) 673 return (EINVAL); 674 pti->pt_flags |= PF_PKT; 675 } else 676 pti->pt_flags &= ~PF_PKT; 677 return (0); 678 679 case TIOCUCNTL: 680 if (*(int *)data) { 681 if (pti->pt_flags & PF_PKT) 682 return (EINVAL); 683 pti->pt_flags |= PF_UCNTL; 684 } else 685 pti->pt_flags &= ~PF_UCNTL; 686 return (0); 687 688 case TIOCREMOTE: 689 if (*(int *)data) 690 pti->pt_flags |= PF_REMOTE; 691 else 692 pti->pt_flags &= ~PF_REMOTE; 693 ttyflush(tp, FREAD|FWRITE); 694 return (0); 695 } 696 697 /* 698 * The rest of the ioctls shouldn't be called until 699 * the slave is open. 700 */ 701 if ((tp->t_state & TS_ISOPEN) == 0) 702 return (EAGAIN); 703 704 switch (cmd) { 705#ifdef COMPAT_43 706 case TIOCSETP: 707 case TIOCSETN: 708#endif 709 case TIOCSETD: 710 case TIOCSETA: 711 case TIOCSETAW: 712 case TIOCSETAF: 713 /* 714 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 715 * ttywflush(tp) will hang if there are characters in 716 * the outq. 717 */ 718 ndflush(&tp->t_outq, tp->t_outq.c_cc); 719 break; 720 721 case TIOCSIG: 722 if (*(unsigned int *)data >= NSIG || 723 *(unsigned int *)data == 0) 724 return(EINVAL); 725 if ((tp->t_lflag&NOFLSH) == 0) 726 ttyflush(tp, FREAD|FWRITE); 727 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 728 if ((*(unsigned int *)data == SIGINFO) && 729 ((tp->t_lflag&NOKERNINFO) == 0)) 730 ttyinfo(tp); 731 return(0); 732 } 733 } 734 if (cmd == TIOCEXT) { 735 /* 736 * When the EXTPROC bit is being toggled, we need 737 * to send an TIOCPKT_IOCTL if the packet driver 738 * is turned on. 739 */ 740 if (*(int *)data) { 741 if (pti->pt_flags & PF_PKT) { 742 pti->pt_send |= TIOCPKT_IOCTL; 743 ptcwakeup(tp, FREAD); 744 } 745 tp->t_lflag |= EXTPROC; 746 } else { 747 if ((tp->t_lflag & EXTPROC) && 748 (pti->pt_flags & PF_PKT)) { 749 pti->pt_send |= TIOCPKT_IOCTL; 750 ptcwakeup(tp, FREAD); 751 } 752 tp->t_lflag &= ~EXTPROC; 753 } 754 return(0); 755 } 756 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 757 if (error == ENOIOCTL) 758 error = ttioctl(tp, cmd, data, flag); 759 if (error == ENOIOCTL) { 760 if (pti->pt_flags & PF_UCNTL && 761 (cmd & ~0xff) == UIOCCMD(0)) { 762 if (cmd & 0xff) { 763 pti->pt_ucntl = (u_char)cmd; 764 ptcwakeup(tp, FREAD); 765 } 766 return (0); 767 } 768 error = ENOTTY; 769 } 770 /* 771 * If external processing and packet mode send ioctl packet. 772 */ 773 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 774 switch(cmd) { 775 case TIOCSETA: 776 case TIOCSETAW: 777 case TIOCSETAF: 778#ifdef COMPAT_43 779 case TIOCSETP: 780 case TIOCSETN: 781#endif 782#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 783 case TIOCSETC: 784 case TIOCSLTC: 785 case TIOCLBIS: 786 case TIOCLBIC: 787 case TIOCLSET: 788#endif 789 pti->pt_send |= TIOCPKT_IOCTL; 790 ptcwakeup(tp, FREAD); 791 default: 792 break; 793 } 794 } 795 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 796 && CCEQ(cc[VSTART], CTRL('q')); 797 if (pti->pt_flags & PF_NOSTOP) { 798 if (stop) { 799 pti->pt_send &= ~TIOCPKT_NOSTOP; 800 pti->pt_send |= TIOCPKT_DOSTOP; 801 pti->pt_flags &= ~PF_NOSTOP; 802 ptcwakeup(tp, FREAD); 803 } 804 } else { 805 if (!stop) { 806 pti->pt_send &= ~TIOCPKT_DOSTOP; 807 pti->pt_send |= TIOCPKT_NOSTOP; 808 pti->pt_flags |= PF_NOSTOP; 809 ptcwakeup(tp, FREAD); 810 } 811 } 812 return (error); 813} 814 815 816static void ptc_drvinit __P((void *unused)); 817 818static void 819ptc_drvinit(unused) 820 void *unused; 821{ 822 static int ptc_devsw_installed; 823 824 if( ! ptc_devsw_installed ) { 825 cdevsw_add(&pts_cdevsw); 826 cdevsw_add(&ptc_cdevsw); 827 ptc_devsw_installed = 1; 828 } 829} 830 831SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL) 832