Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/kern/tty_pty.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD: releng/6.4/sys/kern/tty_pty.c 173992 2007-11-27 18:43:09Z jhb $"); 34 35 /* 36 * Pseudo-teletype Driver 37 * (Actually two drivers, requiring two entries in 'cdevsw') 38 */ 39 #include "opt_compat.h" 40 #include "opt_tty.h" 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/libkern.h> 44 #include <sys/lock.h> 45 #include <sys/mutex.h> 46 #include <sys/sx.h> 47 #ifndef BURN_BRIDGES 48 #if defined(COMPAT_43) 49 #include <sys/ioctl_compat.h> 50 #endif 51 #endif 52 #include <sys/proc.h> 53 #include <sys/tty.h> 54 #include <sys/conf.h> 55 #include <sys/fcntl.h> 56 #include <sys/poll.h> 57 #include <sys/kernel.h> 58 #include <sys/uio.h> 59 #include <sys/signalvar.h> 60 #include <sys/malloc.h> 61 62 static MALLOC_DEFINE(M_PTY, "ptys", "pty data structures"); 63 64 static void ptsstart(struct tty *tp); 65 static void ptsstop(struct tty *tp, int rw); 66 static void ptcwakeup(struct tty *tp, int flag); 67 static struct cdev *ptyinit(struct cdev *cdev, struct thread *td); 68 69 static d_open_t ptsopen; 70 static d_close_t ptsclose; 71 static d_read_t ptsread; 72 static d_write_t ptswrite; 73 static d_ioctl_t ptsioctl; 74 static d_open_t ptcopen; 75 static d_close_t ptcclose; 76 static d_read_t ptcread; 77 static d_ioctl_t ptcioctl; 78 static d_write_t ptcwrite; 79 static d_poll_t ptcpoll; 80 81 static struct cdevsw pts_cdevsw = { 82 .d_version = D_VERSION, 83 .d_open = ptsopen, 84 .d_close = ptsclose, 85 .d_read = ptsread, 86 .d_write = ptswrite, 87 .d_ioctl = ptsioctl, 88 .d_name = "pts", 89 .d_flags = D_TTY | D_NEEDGIANT, 90 }; 91 92 static struct cdevsw ptc_cdevsw = { 93 .d_version = D_VERSION, 94 .d_open = ptcopen, 95 .d_close = ptcclose, 96 .d_read = ptcread, 97 .d_write = ptcwrite, 98 .d_ioctl = ptcioctl, 99 .d_poll = ptcpoll, 100 .d_name = "ptc", 101 .d_flags = D_TTY | D_NEEDGIANT, 102 }; 103 104 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 105 106 struct ptsc { 107 int pt_flags; 108 struct selinfo pt_selr, pt_selw; 109 u_char pt_send; 110 u_char pt_ucntl; 111 struct tty *pt_tty; 112 struct cdev *devs, *devc; 113 struct prison *pt_prison; 114 }; 115 116 #define PF_PKT 0x08 /* packet mode */ 117 #define PF_STOPPED 0x10 /* user told stopped */ 118 #define PF_NOSTOP 0x40 119 #define PF_UCNTL 0x80 /* user control mode */ 120 121 #define TSA_PTC_READ(tp) ((void *)&(tp)->t_outq.c_cf) 122 #define TSA_PTC_WRITE(tp) ((void *)&(tp)->t_rawq.c_cl) 123 #define TSA_PTS_READ(tp) ((void *)&(tp)->t_canq) 124 125 static const char names[] = "pqrsPQRSlmnoLMNO"; 126 /* 127 * This function creates and initializes a pts/ptc pair 128 * 129 * pts == /dev/tty[pqrsPQRSlmnoLMNO][0123456789abcdefghijklmnopqrstuv] 130 * ptc == /dev/pty[pqrsPQRSlmnoLMNO][0123456789abcdefghijklmnopqrstuv] 131 */ 132 static struct cdev * 133 ptyinit(struct cdev *devc, struct thread *td) 134 { 135 struct cdev *devs; 136 struct ptsc *pt; 137 int n; 138 139 n = minor2unit(minor(devc)); 140 141 /* We only allow for up to 32 ptys per char in "names". */ 142 if (n >= 32 * (sizeof(names) - 1)) 143 return (NULL); 144 145 devc->si_flags &= ~SI_CHEAPCLONE; 146 147 pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO); 148 pt->devs = devs = make_dev_cred(&pts_cdevsw, n, td->td_ucred, 149 UID_ROOT, GID_WHEEL, 0666, "tty%c%r", names[n / 32], n % 32); 150 pt->devc = devc; 151 152 pt->pt_tty = ttymalloc(pt->pt_tty); 153 pt->pt_tty->t_sc = pt; 154 devs->si_drv1 = devc->si_drv1 = pt; 155 devs->si_tty = devc->si_tty = pt->pt_tty; 156 pt->pt_tty->t_dev = devs; 157 return (devc); 158 } 159 160 /*ARGSUSED*/ 161 static int 162 ptsopen(struct cdev *dev, int flag, int devtype, struct thread *td) 163 { 164 struct tty *tp; 165 int error; 166 struct ptsc *pt; 167 168 if (!dev->si_drv1) 169 return(ENXIO); 170 pt = dev->si_drv1; 171 tp = dev->si_tty; 172 if ((tp->t_state & TS_ISOPEN) == 0) { 173 ttyinitmode(tp, 1, 0); 174 } else if (tp->t_state & TS_XCLUDE && suser(td)) 175 return (EBUSY); 176 else if (pt->pt_prison != td->td_ucred->cr_prison && suser(td)) 177 return (EBUSY); 178 if (tp->t_oproc) /* Ctrlr still around. */ 179 (void)ttyld_modem(tp, 1); 180 while ((tp->t_state & TS_CARR_ON) == 0) { 181 if (flag&FNONBLOCK) 182 break; 183 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 184 "ptsopn", 0); 185 if (error) 186 return (error); 187 } 188 error = ttyld_open(tp, dev); 189 if (error == 0) 190 ptcwakeup(tp, FREAD|FWRITE); 191 return (error); 192 } 193 194 static int 195 ptsclose(struct cdev *dev, int flag, int mode, struct thread *td) 196 { 197 struct tty *tp; 198 int err; 199 200 tp = dev->si_tty; 201 err = ttyld_close(tp, flag); 202 (void) tty_close(tp); 203 return (err); 204 } 205 206 static int 207 ptsread(struct cdev *dev, struct uio *uio, int flag) 208 { 209 struct tty *tp = dev->si_tty; 210 int error = 0; 211 212 if (tp->t_oproc) 213 error = ttyld_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 */ 223 static int 224 ptswrite(struct cdev *dev, struct uio *uio, int flag) 225 { 226 struct tty *tp; 227 228 tp = dev->si_tty; 229 if (tp->t_oproc == 0) 230 return (EIO); 231 return (ttyld_write(tp, uio, flag)); 232 } 233 234 /* 235 * Start output on pseudo-tty. 236 * Wake up process selecting or sleeping for input from controlling tty. 237 */ 238 static void 239 ptsstart(struct tty *tp) 240 { 241 struct ptsc *pt = tp->t_sc; 242 243 if (tp->t_state & TS_TTSTOP) 244 return; 245 if (pt->pt_flags & PF_STOPPED) { 246 pt->pt_flags &= ~PF_STOPPED; 247 pt->pt_send = TIOCPKT_START; 248 } 249 ptcwakeup(tp, FREAD); 250 } 251 252 static void 253 ptcwakeup(struct tty *tp, int flag) 254 { 255 struct ptsc *pt = tp->t_sc; 256 257 if (flag & FREAD) { 258 selwakeuppri(&pt->pt_selr, TTIPRI); 259 wakeup(TSA_PTC_READ(tp)); 260 } 261 if (flag & FWRITE) { 262 selwakeuppri(&pt->pt_selw, TTOPRI); 263 wakeup(TSA_PTC_WRITE(tp)); 264 } 265 } 266 267 static int 268 ptcopen(struct cdev *dev, int flag, int devtype, struct thread *td) 269 { 270 struct tty *tp; 271 struct ptsc *pt; 272 273 if (!dev->si_drv1) 274 ptyinit(dev, td); 275 if (!dev->si_drv1) 276 return(ENXIO); 277 tp = dev->si_tty; 278 279 if (tp->t_oproc) 280 return (EIO); 281 tp->t_timeout = -1; 282 tp->t_oproc = ptsstart; 283 tp->t_stop = ptsstop; 284 (void)ttyld_modem(tp, 1); 285 tp->t_lflag &= ~EXTPROC; 286 pt = dev->si_drv1; 287 pt->pt_prison = td->td_ucred->cr_prison; 288 pt->pt_flags = 0; 289 pt->pt_send = 0; 290 pt->pt_ucntl = 0; 291 return (0); 292 } 293 294 static int 295 ptcclose(struct cdev *dev, int flags, int fmt, struct thread *td) 296 { 297 struct tty *tp; 298 299 tp = dev->si_tty; 300 (void)ttyld_modem(tp, 0); 301 302 /* 303 * XXX MDMBUF makes no sense for ptys but would inhibit the above 304 * l_modem(). CLOCAL makes sense but isn't supported. Special 305 * l_modem()s that ignore carrier drop make no sense for ptys but 306 * may be in use because other parts of the line discipline make 307 * sense for ptys. Recover by doing everything that a normal 308 * ttymodem() would have done except for sending a SIGHUP. 309 */ 310 if (tp->t_state & TS_ISOPEN) { 311 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 312 tp->t_state |= TS_ZOMBIE; 313 ttyflush(tp, FREAD | FWRITE); 314 } 315 316 tp->t_oproc = 0; /* mark closed */ 317 return (0); 318 } 319 320 static int 321 ptcread(struct cdev *dev, struct uio *uio, int flag) 322 { 323 struct tty *tp = dev->si_tty; 324 struct ptsc *pt = dev->si_drv1; 325 char buf[BUFSIZ]; 326 int error = 0, cc; 327 328 /* 329 * We want to block until the slave 330 * is open, and there's something to read; 331 * but if we lost the slave or we're NBIO, 332 * then return the appropriate error instead. 333 */ 334 for (;;) { 335 if (tp->t_state&TS_ISOPEN) { 336 if (pt->pt_flags&PF_PKT && pt->pt_send) { 337 error = ureadc((int)pt->pt_send, uio); 338 if (error) 339 return (error); 340 if (pt->pt_send & TIOCPKT_IOCTL) { 341 cc = min(uio->uio_resid, 342 sizeof(tp->t_termios)); 343 uiomove(&tp->t_termios, cc, uio); 344 } 345 pt->pt_send = 0; 346 return (0); 347 } 348 if (pt->pt_flags&PF_UCNTL && pt->pt_ucntl) { 349 error = ureadc((int)pt->pt_ucntl, uio); 350 if (error) 351 return (error); 352 pt->pt_ucntl = 0; 353 return (0); 354 } 355 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 356 break; 357 } 358 if ((tp->t_state & TS_CONNECTED) == 0) 359 return (0); /* EOF */ 360 if (flag & O_NONBLOCK) 361 return (EWOULDBLOCK); 362 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 363 if (error) 364 return (error); 365 } 366 if (pt->pt_flags & (PF_PKT|PF_UCNTL)) 367 error = ureadc(0, uio); 368 while (uio->uio_resid > 0 && error == 0) { 369 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 370 if (cc <= 0) 371 break; 372 error = uiomove(buf, cc, uio); 373 } 374 ttwwakeup(tp); 375 return (error); 376 } 377 378 static void 379 ptsstop(struct tty *tp, int flush) 380 { 381 struct ptsc *pt = tp->t_sc; 382 int flag; 383 384 /* note: FLUSHREAD and FLUSHWRITE already ok */ 385 if (flush == 0) { 386 flush = TIOCPKT_STOP; 387 pt->pt_flags |= PF_STOPPED; 388 } else 389 pt->pt_flags &= ~PF_STOPPED; 390 pt->pt_send |= flush; 391 /* change of perspective */ 392 flag = 0; 393 if (flush & FREAD) 394 flag |= FWRITE; 395 if (flush & FWRITE) 396 flag |= FREAD; 397 ptcwakeup(tp, flag); 398 } 399 400 static int 401 ptcpoll(struct cdev *dev, int events, struct thread *td) 402 { 403 struct tty *tp = dev->si_tty; 404 struct ptsc *pt = dev->si_drv1; 405 int revents = 0; 406 int s; 407 408 if ((tp->t_state & TS_CONNECTED) == 0) 409 return (events & 410 (POLLHUP | POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM)); 411 412 /* 413 * Need to block timeouts (ttrstart). 414 */ 415 s = spltty(); 416 417 if (events & (POLLIN | POLLRDNORM)) 418 if ((tp->t_state & TS_ISOPEN) && 419 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || 420 ((pt->pt_flags & PF_PKT) && pt->pt_send) || 421 ((pt->pt_flags & PF_UCNTL) && pt->pt_ucntl))) 422 revents |= events & (POLLIN | POLLRDNORM); 423 424 if (events & (POLLOUT | POLLWRNORM)) 425 if (tp->t_state & TS_ISOPEN && 426 (((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 427 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) 428 revents |= events & (POLLOUT | POLLWRNORM); 429 430 if (events & POLLHUP) 431 if ((tp->t_state & TS_CARR_ON) == 0) 432 revents |= POLLHUP; 433 434 if (revents == 0) { 435 if (events & (POLLIN | POLLRDNORM)) 436 selrecord(td, &pt->pt_selr); 437 438 if (events & (POLLOUT | POLLWRNORM)) 439 selrecord(td, &pt->pt_selw); 440 } 441 splx(s); 442 443 return (revents); 444 } 445 446 static int 447 ptcwrite(struct cdev *dev, struct uio *uio, int flag) 448 { 449 struct tty *tp = dev->si_tty; 450 u_char *cp = 0; 451 int cc = 0; 452 u_char locbuf[BUFSIZ]; 453 int cnt = 0; 454 int error = 0; 455 456 again: 457 if ((tp->t_state&TS_ISOPEN) == 0) 458 goto block; 459 while (uio->uio_resid > 0 || cc > 0) { 460 if (cc == 0) { 461 cc = min(uio->uio_resid, BUFSIZ); 462 cp = locbuf; 463 error = uiomove(cp, cc, uio); 464 if (error) 465 return (error); 466 /* check again for safety */ 467 if ((tp->t_state & TS_ISOPEN) == 0) { 468 /* adjust for data copied in but not written */ 469 uio->uio_resid += cc; 470 return (EIO); 471 } 472 } 473 while (cc > 0) { 474 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 475 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) { 476 wakeup(TSA_HUP_OR_INPUT(tp)); 477 goto block; 478 } 479 ttyld_rint(tp, *cp++); 480 cnt++; 481 cc--; 482 } 483 cc = 0; 484 } 485 return (0); 486 block: 487 /* 488 * Come here to wait for slave to open, for space 489 * in outq, or space in rawq, or an empty canq. 490 */ 491 if ((tp->t_state & TS_CONNECTED) == 0) { 492 /* adjust for data copied in but not written */ 493 uio->uio_resid += cc; 494 return (EIO); 495 } 496 if (flag & O_NONBLOCK) { 497 /* adjust for data copied in but not written */ 498 uio->uio_resid += cc; 499 if (cnt == 0) 500 return (EWOULDBLOCK); 501 return (0); 502 } 503 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); 504 if (error) { 505 /* adjust for data copied in but not written */ 506 uio->uio_resid += cc; 507 return (error); 508 } 509 goto again; 510 } 511 512 /*ARGSUSED*/ 513 static int 514 ptcioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 515 { 516 struct tty *tp = dev->si_tty; 517 struct ptsc *pt = dev->si_drv1; 518 int ival; 519 520 switch (cmd) { 521 522 case TIOCGPGRP: 523 /* 524 * We avoid calling ttioctl on the controller since, 525 * in that case, tp must be the controlling terminal. 526 */ 527 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 528 return (0); 529 530 case TIOCPKT: 531 if (*(int *)data) { 532 if (pt->pt_flags & PF_UCNTL) 533 return (EINVAL); 534 pt->pt_flags |= PF_PKT; 535 } else 536 pt->pt_flags &= ~PF_PKT; 537 return (0); 538 539 case TIOCUCNTL: 540 if (*(int *)data) { 541 if (pt->pt_flags & PF_PKT) 542 return (EINVAL); 543 pt->pt_flags |= PF_UCNTL; 544 } else 545 pt->pt_flags &= ~PF_UCNTL; 546 return (0); 547 } 548 549 /* 550 * The rest of the ioctls shouldn't be called until 551 * the slave is open. 552 */ 553 if ((tp->t_state & TS_ISOPEN) == 0) 554 return (EAGAIN); 555 556 switch (cmd) { 557 #ifndef BURN_BRIDGES 558 #ifdef COMPAT_43 559 case TIOCSETP: 560 case TIOCSETN: 561 #endif 562 #endif 563 case TIOCSETD: 564 case TIOCSETA: 565 case TIOCSETAW: 566 case TIOCSETAF: 567 /* 568 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 569 * ttywflush(tp) will hang if there are characters in 570 * the outq. 571 */ 572 ndflush(&tp->t_outq, tp->t_outq.c_cc); 573 break; 574 575 case _IO('t', 95): 576 ival = IOCPARM_IVAL(data); 577 data = (caddr_t)&ival; 578 /* FALLTHROUGH */ 579 case TIOCSIG: 580 if (*(unsigned int *)data >= NSIG || 581 *(unsigned int *)data == 0) 582 return(EINVAL); 583 if ((tp->t_lflag&NOFLSH) == 0) 584 ttyflush(tp, FREAD|FWRITE); 585 if (tp->t_pgrp != NULL) { 586 PGRP_LOCK(tp->t_pgrp); 587 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 588 PGRP_UNLOCK(tp->t_pgrp); 589 } 590 if ((*(unsigned int *)data == SIGINFO) && 591 ((tp->t_lflag&NOKERNINFO) == 0)) 592 ttyinfo(tp); 593 return(0); 594 } 595 596 return (ptsioctl(dev, cmd, data, flag, td)); 597 } 598 599 /*ARGSUSED*/ 600 static int 601 ptsioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 602 { 603 struct tty *tp = dev->si_tty; 604 struct ptsc *pt = dev->si_drv1; 605 u_char *cc = tp->t_cc; 606 int stop, error; 607 608 if (cmd == TIOCEXT) { 609 /* 610 * When the EXTPROC bit is being toggled, we need 611 * to send an TIOCPKT_IOCTL if the packet driver 612 * is turned on. 613 */ 614 if (*(int *)data) { 615 if (pt->pt_flags & PF_PKT) { 616 pt->pt_send |= TIOCPKT_IOCTL; 617 ptcwakeup(tp, FREAD); 618 } 619 tp->t_lflag |= EXTPROC; 620 } else { 621 if ((tp->t_lflag & EXTPROC) && 622 (pt->pt_flags & PF_PKT)) { 623 pt->pt_send |= TIOCPKT_IOCTL; 624 ptcwakeup(tp, FREAD); 625 } 626 tp->t_lflag &= ~EXTPROC; 627 } 628 return(0); 629 } 630 error = ttyioctl(dev, cmd, data, flag, td); 631 if (error == ENOTTY) { 632 if (pt->pt_flags & PF_UCNTL && 633 (cmd & ~0xff) == UIOCCMD(0)) { 634 if (cmd & 0xff) { 635 pt->pt_ucntl = (u_char)cmd; 636 ptcwakeup(tp, FREAD); 637 } 638 return (0); 639 } 640 error = ENOTTY; 641 } 642 /* 643 * If external processing and packet mode send ioctl packet. 644 */ 645 if ((tp->t_lflag&EXTPROC) && (pt->pt_flags & PF_PKT)) { 646 switch(cmd) { 647 case TIOCSETA: 648 case TIOCSETAW: 649 case TIOCSETAF: 650 #ifndef BURN_BRIDGES 651 #ifdef COMPAT_43 652 case TIOCSETP: 653 case TIOCSETN: 654 case TIOCSETC: 655 case TIOCSLTC: 656 case TIOCLBIS: 657 case TIOCLBIC: 658 case TIOCLSET: 659 #endif 660 #endif 661 pt->pt_send |= TIOCPKT_IOCTL; 662 ptcwakeup(tp, FREAD); 663 break; 664 default: 665 break; 666 } 667 } 668 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 669 && CCEQ(cc[VSTART], CTRL('q')); 670 if (pt->pt_flags & PF_NOSTOP) { 671 if (stop) { 672 pt->pt_send &= ~TIOCPKT_NOSTOP; 673 pt->pt_send |= TIOCPKT_DOSTOP; 674 pt->pt_flags &= ~PF_NOSTOP; 675 ptcwakeup(tp, FREAD); 676 } 677 } else { 678 if (!stop) { 679 pt->pt_send &= ~TIOCPKT_DOSTOP; 680 pt->pt_send |= TIOCPKT_NOSTOP; 681 pt->pt_flags |= PF_NOSTOP; 682 ptcwakeup(tp, FREAD); 683 } 684 } 685 return (error); 686 } 687 688 static void 689 pty_clone(void *arg, struct ucred *cr, char *name, int namelen, 690 struct cdev **dev) 691 { 692 char *cp; 693 int u; 694 695 if (*dev != NULL) 696 return; 697 if (bcmp(name, "pty", 3) != 0) 698 return; 699 if (name[5] != '\0' || name[3] == '\0') 700 return; 701 cp = index(names, name[3]); 702 if (cp == NULL) 703 return; 704 u = (cp - names) * 32; 705 if (name[4] >= '' && name[4] <= '9') 706 u += name[4] - ''; 707 else if (name[4] >= 'a' && name[4] <= 'v') 708 u += name[4] - 'a' + 10; 709 else 710 return; 711 *dev = make_dev_cred(&ptc_cdevsw, unit2minor(u), cr, 712 UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32); 713 dev_ref(*dev); 714 (*dev)->si_flags |= SI_CHEAPCLONE; 715 return; 716 } 717 718 static void 719 ptc_drvinit(void *unused) 720 { 721 722 EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000); 723 } 724 725 SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,ptc_drvinit,NULL)
Cache object: e84b5ed77740bc39bec99b0a98d3bbfc
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]