Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/tty_pty.c
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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 * $FreeBSD$ 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 #include <sys/param.h> 44 #include <sys/systm.h> 45 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 46 #include <sys/ioctl_compat.h> 47 #endif 48 #include <sys/proc.h> 49 #include <sys/tty.h> 50 #include <sys/conf.h> 51 #include <sys/fcntl.h> 52 #include <sys/poll.h> 53 #include <sys/kernel.h> 54 #include <sys/vnode.h> 55 #include <sys/signalvar.h> 56 #include <sys/malloc.h> 57 58 MALLOC_DEFINE(M_PTY, "ptys", "pty data structures"); 59 60 static void ptsstart __P((struct tty *tp)); 61 static void ptsstop __P((struct tty *tp, int rw)); 62 static void ptcwakeup __P((struct tty *tp, int flag)); 63 static void ptyinit __P((int n)); 64 65 static d_open_t ptsopen; 66 static d_close_t ptsclose; 67 static d_read_t ptsread; 68 static d_write_t ptswrite; 69 static d_ioctl_t ptyioctl; 70 static d_open_t ptcopen; 71 static d_close_t ptcclose; 72 static d_read_t ptcread; 73 static d_write_t ptcwrite; 74 static d_poll_t ptcpoll; 75 76 #define CDEV_MAJOR_S 5 77 static struct cdevsw pts_cdevsw = { 78 /* open */ ptsopen, 79 /* close */ ptsclose, 80 /* read */ ptsread, 81 /* write */ ptswrite, 82 /* ioctl */ ptyioctl, 83 /* poll */ ttypoll, 84 /* mmap */ nommap, 85 /* strategy */ nostrategy, 86 /* name */ "pts", 87 /* maj */ CDEV_MAJOR_S, 88 /* dump */ nodump, 89 /* psize */ nopsize, 90 /* flags */ D_TTY | D_KQFILTER, 91 /* bmaj */ -1, 92 /* kqfilter */ ttykqfilter, 93 }; 94 95 #define CDEV_MAJOR_C 6 96 static struct cdevsw ptc_cdevsw = { 97 /* open */ ptcopen, 98 /* close */ ptcclose, 99 /* read */ ptcread, 100 /* write */ ptcwrite, 101 /* ioctl */ ptyioctl, 102 /* poll */ ptcpoll, 103 /* mmap */ nommap, 104 /* strategy */ nostrategy, 105 /* name */ "ptc", 106 /* maj */ CDEV_MAJOR_C, 107 /* dump */ nodump, 108 /* psize */ nopsize, 109 /* flags */ D_TTY | D_KQFILTER, 110 /* bmaj */ -1, 111 /* kqfilter */ ttykqfilter, 112 }; 113 114 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 115 116 struct pt_ioctl { 117 int pt_flags; 118 struct selinfo pt_selr, pt_selw; 119 u_char pt_send; 120 u_char pt_ucntl; 121 struct tty pt_tty; 122 dev_t devs, devc; 123 struct prison *pt_prison; 124 }; 125 126 #define PF_PKT 0x08 /* packet mode */ 127 #define PF_STOPPED 0x10 /* user told stopped */ 128 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 129 #define PF_NOSTOP 0x40 130 #define PF_UCNTL 0x80 /* user control mode */ 131 132 /* 133 * This function creates and initializes a pts/ptc pair 134 * 135 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 136 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 137 * 138 * XXX: define and add mapping of upper minor bits to allow more 139 * than 256 ptys. 140 */ 141 static void 142 ptyinit(n) 143 int n; 144 { 145 dev_t devs, devc; 146 char *names = "pqrsPQRS"; 147 struct pt_ioctl *pt; 148 149 /* For now we only map the lower 8 bits of the minor */ 150 if (n & ~0xff) 151 return; 152 153 pt = malloc(sizeof(*pt), M_PTY, M_WAITOK); 154 bzero(pt, sizeof(*pt)); 155 pt->devs = devs = make_dev(&pts_cdevsw, n, 156 0, 0, 0666, "tty%c%r", names[n / 32], n % 32); 157 pt->devc = devc = make_dev(&ptc_cdevsw, n, 158 0, 0, 0666, "pty%c%r", names[n / 32], n % 32); 159 160 devs->si_drv1 = devc->si_drv1 = pt; 161 devs->si_tty = devc->si_tty = &pt->pt_tty; 162 pt->pt_tty.t_dev = devs; 163 ttyregister(&pt->pt_tty); 164 } 165 166 /*ARGSUSED*/ 167 static int 168 ptsopen(dev, flag, devtype, p) 169 dev_t dev; 170 int flag, devtype; 171 struct proc *p; 172 { 173 register struct tty *tp; 174 int error; 175 int minr; 176 dev_t nextdev; 177 struct pt_ioctl *pti; 178 179 /* 180 * XXX: Gross hack for DEVFS: 181 * XXX: DEVFS is no more, should this be removed? 182 * If we openned this device, ensure we have the 183 * next one too, so people can open it. 184 */ 185 minr = lminor(dev); 186 if (minr < 255) { 187 nextdev = makedev(major(dev), minr + 1); 188 if (!nextdev->si_drv1) { 189 ptyinit(minr + 1); 190 } 191 } 192 if (!dev->si_drv1) 193 ptyinit(minor(dev)); 194 if (!dev->si_drv1) 195 return(ENXIO); 196 pti = dev->si_drv1; 197 tp = dev->si_tty; 198 if ((tp->t_state & TS_ISOPEN) == 0) { 199 ttychars(tp); /* Set up default chars */ 200 tp->t_iflag = TTYDEF_IFLAG; 201 tp->t_oflag = TTYDEF_OFLAG; 202 tp->t_lflag = TTYDEF_LFLAG; 203 tp->t_cflag = TTYDEF_CFLAG; 204 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 205 } else if (tp->t_state & TS_XCLUDE && suser(p)) { 206 return (EBUSY); 207 } else if (pti->pt_prison != p->p_prison) { 208 return (EBUSY); 209 } 210 if (tp->t_oproc) /* Ctrlr still around. */ 211 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 212 while ((tp->t_state & TS_CARR_ON) == 0) { 213 if (flag&FNONBLOCK) 214 break; 215 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 216 "ptsopn", 0); 217 if (error) 218 return (error); 219 } 220 error = (*linesw[tp->t_line].l_open)(dev, tp); 221 if (error == 0) 222 ptcwakeup(tp, FREAD|FWRITE); 223 return (error); 224 } 225 226 static int 227 ptsclose(dev, flag, mode, p) 228 dev_t dev; 229 int flag, mode; 230 struct proc *p; 231 { 232 register struct tty *tp; 233 int err; 234 235 tp = dev->si_tty; 236 err = (*linesw[tp->t_line].l_close)(tp, flag); 237 ptsstop(tp, FREAD|FWRITE); 238 (void) ttyclose(tp); 239 return (err); 240 } 241 242 static int 243 ptsread(dev, uio, flag) 244 dev_t dev; 245 struct uio *uio; 246 int flag; 247 { 248 struct proc *p = curproc; 249 register struct tty *tp = dev->si_tty; 250 register struct pt_ioctl *pti = dev->si_drv1; 251 int error = 0; 252 253 again: 254 if (pti->pt_flags & PF_REMOTE) { 255 while (isbackground(p, tp)) { 256 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) || 257 SIGISMEMBER(p->p_sigmask, SIGTTIN) || 258 p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) 259 return (EIO); 260 pgsignal(p->p_pgrp, SIGTTIN, 1); 261 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg", 262 0); 263 if (error) 264 return (error); 265 } 266 if (tp->t_canq.c_cc == 0) { 267 if (flag & IO_NDELAY) 268 return (EWOULDBLOCK); 269 error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, 270 "ptsin", 0); 271 if (error) 272 return (error); 273 goto again; 274 } 275 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 276 if (ureadc(getc(&tp->t_canq), uio) < 0) { 277 error = EFAULT; 278 break; 279 } 280 if (tp->t_canq.c_cc == 1) 281 (void) getc(&tp->t_canq); 282 if (tp->t_canq.c_cc) 283 return (error); 284 } else 285 if (tp->t_oproc) 286 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 287 ptcwakeup(tp, FWRITE); 288 return (error); 289 } 290 291 /* 292 * Write to pseudo-tty. 293 * Wakeups of controlling tty will happen 294 * indirectly, when tty driver calls ptsstart. 295 */ 296 static int 297 ptswrite(dev, uio, flag) 298 dev_t dev; 299 struct uio *uio; 300 int flag; 301 { 302 register struct tty *tp; 303 304 tp = dev->si_tty; 305 if (tp->t_oproc == 0) 306 return (EIO); 307 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 308 } 309 310 /* 311 * Start output on pseudo-tty. 312 * Wake up process selecting or sleeping for input from controlling tty. 313 */ 314 static void 315 ptsstart(tp) 316 struct tty *tp; 317 { 318 register struct pt_ioctl *pti = tp->t_dev->si_drv1; 319 320 if (tp->t_state & TS_TTSTOP) 321 return; 322 if (pti->pt_flags & PF_STOPPED) { 323 pti->pt_flags &= ~PF_STOPPED; 324 pti->pt_send = TIOCPKT_START; 325 } 326 ptcwakeup(tp, FREAD); 327 } 328 329 static void 330 ptcwakeup(tp, flag) 331 struct tty *tp; 332 int flag; 333 { 334 struct pt_ioctl *pti = tp->t_dev->si_drv1; 335 336 if (flag & FREAD) { 337 selwakeup(&pti->pt_selr); 338 wakeup(TSA_PTC_READ(tp)); 339 } 340 if (flag & FWRITE) { 341 selwakeup(&pti->pt_selw); 342 wakeup(TSA_PTC_WRITE(tp)); 343 } 344 } 345 346 static int 347 ptcopen(dev, flag, devtype, p) 348 dev_t dev; 349 int flag, devtype; 350 struct proc *p; 351 { 352 register struct tty *tp; 353 struct pt_ioctl *pti; 354 355 if (!dev->si_drv1) 356 ptyinit(minor(dev)); 357 if (!dev->si_drv1) 358 return(ENXIO); 359 tp = dev->si_tty; 360 if (tp->t_oproc) 361 return (EIO); 362 tp->t_oproc = ptsstart; 363 tp->t_stop = ptsstop; 364 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 365 tp->t_lflag &= ~EXTPROC; 366 pti = dev->si_drv1; 367 pti->pt_prison = p->p_prison; 368 pti->pt_flags = 0; 369 pti->pt_send = 0; 370 pti->pt_ucntl = 0; 371 return (0); 372 } 373 374 static int 375 ptcclose(dev, flags, fmt, p) 376 dev_t dev; 377 int flags; 378 int fmt; 379 struct proc *p; 380 { 381 register struct tty *tp; 382 383 tp = dev->si_tty; 384 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 385 386 /* 387 * XXX MDMBUF makes no sense for ptys but would inhibit the above 388 * l_modem(). CLOCAL makes sense but isn't supported. Special 389 * l_modem()s that ignore carrier drop make no sense for ptys but 390 * may be in use because other parts of the line discipline make 391 * sense for ptys. Recover by doing everything that a normal 392 * ttymodem() would have done except for sending a SIGHUP. 393 */ 394 if (tp->t_state & TS_ISOPEN) { 395 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 396 tp->t_state |= TS_ZOMBIE; 397 ttyflush(tp, FREAD | FWRITE); 398 } 399 400 tp->t_oproc = 0; /* mark closed */ 401 return (0); 402 } 403 404 static int 405 ptcread(dev, uio, flag) 406 dev_t dev; 407 struct uio *uio; 408 int flag; 409 { 410 register struct tty *tp = dev->si_tty; 411 struct pt_ioctl *pti = dev->si_drv1; 412 char buf[BUFSIZ]; 413 int error = 0, cc; 414 415 /* 416 * We want to block until the slave 417 * is open, and there's something to read; 418 * but if we lost the slave or we're NBIO, 419 * then return the appropriate error instead. 420 */ 421 for (;;) { 422 if (tp->t_state&TS_ISOPEN) { 423 if (pti->pt_flags&PF_PKT && pti->pt_send) { 424 error = ureadc((int)pti->pt_send, uio); 425 if (error) 426 return (error); 427 if (pti->pt_send & TIOCPKT_IOCTL) { 428 cc = min(uio->uio_resid, 429 sizeof(tp->t_termios)); 430 uiomove((caddr_t)&tp->t_termios, cc, 431 uio); 432 } 433 pti->pt_send = 0; 434 return (0); 435 } 436 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 437 error = ureadc((int)pti->pt_ucntl, uio); 438 if (error) 439 return (error); 440 pti->pt_ucntl = 0; 441 return (0); 442 } 443 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 444 break; 445 } 446 if ((tp->t_state & TS_CONNECTED) == 0) 447 return (0); /* EOF */ 448 if (flag & IO_NDELAY) 449 return (EWOULDBLOCK); 450 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 451 if (error) 452 return (error); 453 } 454 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 455 error = ureadc(0, uio); 456 while (uio->uio_resid > 0 && error == 0) { 457 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 458 if (cc <= 0) 459 break; 460 error = uiomove(buf, cc, uio); 461 } 462 ttwwakeup(tp); 463 return (error); 464 } 465 466 static void 467 ptsstop(tp, flush) 468 register struct tty *tp; 469 int flush; 470 { 471 struct pt_ioctl *pti = tp->t_dev->si_drv1; 472 int flag; 473 474 /* note: FLUSHREAD and FLUSHWRITE already ok */ 475 if (flush == 0) { 476 flush = TIOCPKT_STOP; 477 pti->pt_flags |= PF_STOPPED; 478 } else 479 pti->pt_flags &= ~PF_STOPPED; 480 pti->pt_send |= flush; 481 /* change of perspective */ 482 flag = 0; 483 if (flush & FREAD) 484 flag |= FWRITE; 485 if (flush & FWRITE) 486 flag |= FREAD; 487 ptcwakeup(tp, flag); 488 } 489 490 static int 491 ptcpoll(dev, events, p) 492 dev_t dev; 493 int events; 494 struct proc *p; 495 { 496 register struct tty *tp = dev->si_tty; 497 struct pt_ioctl *pti = dev->si_drv1; 498 int revents = 0; 499 int s; 500 501 if ((tp->t_state & TS_CONNECTED) == 0) 502 return (seltrue(dev, events, p) | POLLHUP); 503 504 /* 505 * Need to block timeouts (ttrstart). 506 */ 507 s = spltty(); 508 509 if (events & (POLLIN | POLLRDNORM)) 510 if ((tp->t_state & TS_ISOPEN) && 511 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || 512 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 513 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 514 revents |= events & (POLLIN | POLLRDNORM); 515 516 if (events & (POLLOUT | POLLWRNORM)) 517 if (tp->t_state & TS_ISOPEN && 518 ((pti->pt_flags & PF_REMOTE) ? 519 (tp->t_canq.c_cc == 0) : 520 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 521 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) 522 revents |= events & (POLLOUT | POLLWRNORM); 523 524 if (events & POLLHUP) 525 if ((tp->t_state & TS_CARR_ON) == 0) 526 revents |= POLLHUP; 527 528 if (revents == 0) { 529 if (events & (POLLIN | POLLRDNORM)) 530 selrecord(p, &pti->pt_selr); 531 532 if (events & (POLLOUT | POLLWRNORM)) 533 selrecord(p, &pti->pt_selw); 534 } 535 splx(s); 536 537 return (revents); 538 } 539 540 static int 541 ptcwrite(dev, uio, flag) 542 dev_t dev; 543 register struct uio *uio; 544 int flag; 545 { 546 register struct tty *tp = dev->si_tty; 547 register u_char *cp = 0; 548 register int cc = 0; 549 u_char locbuf[BUFSIZ]; 550 int cnt = 0; 551 struct pt_ioctl *pti = dev->si_drv1; 552 int error = 0; 553 554 again: 555 if ((tp->t_state&TS_ISOPEN) == 0) 556 goto block; 557 if (pti->pt_flags & PF_REMOTE) { 558 if (tp->t_canq.c_cc) 559 goto block; 560 while ((uio->uio_resid > 0 || cc > 0) && 561 tp->t_canq.c_cc < TTYHOG - 1) { 562 if (cc == 0) { 563 cc = min(uio->uio_resid, BUFSIZ); 564 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 565 cp = locbuf; 566 error = uiomove((caddr_t)cp, cc, uio); 567 if (error) 568 return (error); 569 /* check again for safety */ 570 if ((tp->t_state & TS_ISOPEN) == 0) { 571 /* adjust as usual */ 572 uio->uio_resid += cc; 573 return (EIO); 574 } 575 } 576 if (cc > 0) { 577 cc = b_to_q((char *)cp, cc, &tp->t_canq); 578 /* 579 * XXX we don't guarantee that the canq size 580 * is >= TTYHOG, so the above b_to_q() may 581 * leave some bytes uncopied. However, space 582 * is guaranteed for the null terminator if 583 * we don't fail here since (TTYHOG - 1) is 584 * not a multiple of CBSIZE. 585 */ 586 if (cc > 0) 587 break; 588 } 589 } 590 /* adjust for data copied in but not written */ 591 uio->uio_resid += cc; 592 (void) putc(0, &tp->t_canq); 593 ttwakeup(tp); 594 wakeup(TSA_PTS_READ(tp)); 595 return (0); 596 } 597 while (uio->uio_resid > 0 || cc > 0) { 598 if (cc == 0) { 599 cc = min(uio->uio_resid, BUFSIZ); 600 cp = locbuf; 601 error = uiomove((caddr_t)cp, cc, uio); 602 if (error) 603 return (error); 604 /* check again for safety */ 605 if ((tp->t_state & TS_ISOPEN) == 0) { 606 /* adjust for data copied in but not written */ 607 uio->uio_resid += cc; 608 return (EIO); 609 } 610 } 611 while (cc > 0) { 612 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 613 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) { 614 wakeup(TSA_HUP_OR_INPUT(tp)); 615 goto block; 616 } 617 (*linesw[tp->t_line].l_rint)(*cp++, tp); 618 cnt++; 619 cc--; 620 } 621 cc = 0; 622 } 623 return (0); 624 block: 625 /* 626 * Come here to wait for slave to open, for space 627 * in outq, or space in rawq, or an empty canq. 628 */ 629 if ((tp->t_state & TS_CONNECTED) == 0) { 630 /* adjust for data copied in but not written */ 631 uio->uio_resid += cc; 632 return (EIO); 633 } 634 if (flag & IO_NDELAY) { 635 /* adjust for data copied in but not written */ 636 uio->uio_resid += cc; 637 if (cnt == 0) 638 return (EWOULDBLOCK); 639 return (0); 640 } 641 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); 642 if (error) { 643 /* adjust for data copied in but not written */ 644 uio->uio_resid += cc; 645 return (error); 646 } 647 goto again; 648 } 649 650 /*ARGSUSED*/ 651 static int 652 ptyioctl(dev, cmd, data, flag, p) 653 dev_t dev; 654 u_long cmd; 655 caddr_t data; 656 int flag; 657 struct proc *p; 658 { 659 register struct tty *tp = dev->si_tty; 660 register struct pt_ioctl *pti = dev->si_drv1; 661 register u_char *cc = tp->t_cc; 662 int stop, error; 663 664 if (devsw(dev)->d_open == ptcopen) { 665 switch (cmd) { 666 667 case TIOCGPGRP: 668 /* 669 * We avoid calling ttioctl on the controller since, 670 * in that case, tp must be the controlling terminal. 671 */ 672 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 673 return (0); 674 675 case TIOCPKT: 676 if (*(int *)data) { 677 if (pti->pt_flags & PF_UCNTL) 678 return (EINVAL); 679 pti->pt_flags |= PF_PKT; 680 } else 681 pti->pt_flags &= ~PF_PKT; 682 return (0); 683 684 case TIOCUCNTL: 685 if (*(int *)data) { 686 if (pti->pt_flags & PF_PKT) 687 return (EINVAL); 688 pti->pt_flags |= PF_UCNTL; 689 } else 690 pti->pt_flags &= ~PF_UCNTL; 691 return (0); 692 693 case TIOCREMOTE: 694 if (*(int *)data) 695 pti->pt_flags |= PF_REMOTE; 696 else 697 pti->pt_flags &= ~PF_REMOTE; 698 ttyflush(tp, FREAD|FWRITE); 699 return (0); 700 } 701 702 /* 703 * The rest of the ioctls shouldn't be called until 704 * the slave is open. 705 */ 706 if ((tp->t_state & TS_ISOPEN) == 0) 707 return (EAGAIN); 708 709 switch (cmd) { 710 #ifdef COMPAT_43 711 case TIOCSETP: 712 case TIOCSETN: 713 #endif 714 case TIOCSETD: 715 case TIOCSETA: 716 case TIOCSETAW: 717 case TIOCSETAF: 718 /* 719 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 720 * ttywflush(tp) will hang if there are characters in 721 * the outq. 722 */ 723 ndflush(&tp->t_outq, tp->t_outq.c_cc); 724 break; 725 726 case TIOCSIG: 727 if (*(unsigned int *)data >= NSIG || 728 *(unsigned int *)data == 0) 729 return(EINVAL); 730 if ((tp->t_lflag&NOFLSH) == 0) 731 ttyflush(tp, FREAD|FWRITE); 732 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 733 if ((*(unsigned int *)data == SIGINFO) && 734 ((tp->t_lflag&NOKERNINFO) == 0)) 735 ttyinfo(tp); 736 return(0); 737 } 738 } 739 if (cmd == TIOCEXT) { 740 /* 741 * When the EXTPROC bit is being toggled, we need 742 * to send an TIOCPKT_IOCTL if the packet driver 743 * is turned on. 744 */ 745 if (*(int *)data) { 746 if (pti->pt_flags & PF_PKT) { 747 pti->pt_send |= TIOCPKT_IOCTL; 748 ptcwakeup(tp, FREAD); 749 } 750 tp->t_lflag |= EXTPROC; 751 } else { 752 if ((tp->t_lflag & EXTPROC) && 753 (pti->pt_flags & PF_PKT)) { 754 pti->pt_send |= TIOCPKT_IOCTL; 755 ptcwakeup(tp, FREAD); 756 } 757 tp->t_lflag &= ~EXTPROC; 758 } 759 return(0); 760 } 761 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 762 if (error == ENOIOCTL) 763 error = ttioctl(tp, cmd, data, flag); 764 if (error == ENOIOCTL) { 765 if (pti->pt_flags & PF_UCNTL && 766 (cmd & ~0xff) == UIOCCMD(0)) { 767 if (cmd & 0xff) { 768 pti->pt_ucntl = (u_char)cmd; 769 ptcwakeup(tp, FREAD); 770 } 771 return (0); 772 } 773 error = ENOTTY; 774 } 775 /* 776 * If external processing and packet mode send ioctl packet. 777 */ 778 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 779 switch(cmd) { 780 case TIOCSETA: 781 case TIOCSETAW: 782 case TIOCSETAF: 783 #ifdef COMPAT_43 784 case TIOCSETP: 785 case TIOCSETN: 786 #endif 787 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 788 case TIOCSETC: 789 case TIOCSLTC: 790 case TIOCLBIS: 791 case TIOCLBIC: 792 case TIOCLSET: 793 #endif 794 pti->pt_send |= TIOCPKT_IOCTL; 795 ptcwakeup(tp, FREAD); 796 default: 797 break; 798 } 799 } 800 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 801 && CCEQ(cc[VSTART], CTRL('q')); 802 if (pti->pt_flags & PF_NOSTOP) { 803 if (stop) { 804 pti->pt_send &= ~TIOCPKT_NOSTOP; 805 pti->pt_send |= TIOCPKT_DOSTOP; 806 pti->pt_flags &= ~PF_NOSTOP; 807 ptcwakeup(tp, FREAD); 808 } 809 } else { 810 if (!stop) { 811 pti->pt_send &= ~TIOCPKT_DOSTOP; 812 pti->pt_send |= TIOCPKT_NOSTOP; 813 pti->pt_flags |= PF_NOSTOP; 814 ptcwakeup(tp, FREAD); 815 } 816 } 817 return (error); 818 } 819 820 821 static void ptc_drvinit __P((void *unused)); 822 823 static void 824 ptc_drvinit(unused) 825 void *unused; 826 { 827 cdevsw_add(&pts_cdevsw); 828 cdevsw_add(&ptc_cdevsw); 829 /* XXX: Gross hack for DEVFS */ 830 /* XXX: DEVFS is no more, should this be removed? */ 831 ptyinit(0); 832 } 833 834 SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)
Cache object: c3b56312cb3233034a7c83d5ef8448eb
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