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 */ 35 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD: releng/5.2/sys/kern/tty_pty.c 122352 2003-11-09 09:17:26Z tanimura $"); 38 39 /* 40 * Pseudo-teletype Driver 41 * (Actually two drivers, requiring two entries in 'cdevsw') 42 */ 43 #include "opt_compat.h" 44 #include "opt_tty.h" 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/lock.h> 48 #include <sys/mutex.h> 49 #include <sys/sx.h> 50 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 51 #include <sys/ioctl_compat.h> 52 #endif 53 #include <sys/proc.h> 54 #include <sys/tty.h> 55 #include <sys/conf.h> 56 #include <sys/fcntl.h> 57 #include <sys/poll.h> 58 #include <sys/kernel.h> 59 #include <sys/vnode.h> 60 #include <sys/signalvar.h> 61 #include <sys/malloc.h> 62 63 static MALLOC_DEFINE(M_PTY, "ptys", "pty data structures"); 64 65 static void ptsstart(struct tty *tp); 66 static void ptsstop(struct tty *tp, int rw); 67 static void ptcwakeup(struct tty *tp, int flag); 68 static dev_t ptyinit(dev_t cdev); 69 70 static d_open_t ptsopen; 71 static d_close_t ptsclose; 72 static d_read_t ptsread; 73 static d_write_t ptswrite; 74 static d_ioctl_t ptyioctl; 75 static d_open_t ptcopen; 76 static d_close_t ptcclose; 77 static d_read_t ptcread; 78 static d_write_t ptcwrite; 79 static d_poll_t ptcpoll; 80 81 #define CDEV_MAJOR_S 5 82 static struct cdevsw pts_cdevsw = { 83 .d_open = ptsopen, 84 .d_close = ptsclose, 85 .d_read = ptsread, 86 .d_write = ptswrite, 87 .d_ioctl = ptyioctl, 88 .d_poll = ttypoll, 89 .d_name = "pts", 90 .d_maj = CDEV_MAJOR_S, 91 .d_flags = D_TTY, 92 .d_kqfilter = ttykqfilter, 93 }; 94 95 #define CDEV_MAJOR_C 6 96 static struct cdevsw ptc_cdevsw = { 97 .d_open = ptcopen, 98 .d_close = ptcclose, 99 .d_read = ptcread, 100 .d_write = ptcwrite, 101 .d_ioctl = ptyioctl, 102 .d_poll = ptcpoll, 103 .d_name = "ptc", 104 .d_maj = CDEV_MAJOR_C, 105 .d_flags = D_TTY, 106 .d_kqfilter = ttykqfilter, 107 }; 108 109 #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 110 111 struct pt_ioctl { 112 int pt_flags; 113 struct selinfo pt_selr, pt_selw; 114 u_char pt_send; 115 u_char pt_ucntl; 116 struct tty pt_tty; 117 dev_t devs, devc; 118 struct prison *pt_prison; 119 }; 120 121 #define PF_PKT 0x08 /* packet mode */ 122 #define PF_STOPPED 0x10 /* user told stopped */ 123 #define PF_REMOTE 0x20 /* remote and flow controlled input */ 124 #define PF_NOSTOP 0x40 125 #define PF_UCNTL 0x80 /* user control mode */ 126 127 static char *names = "pqrsPQRS"; 128 /* 129 * This function creates and initializes a pts/ptc pair 130 * 131 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 132 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 133 * 134 * XXX: define and add mapping of upper minor bits to allow more 135 * than 256 ptys. 136 */ 137 static dev_t 138 ptyinit(dev_t devc) 139 { 140 dev_t devs; 141 struct pt_ioctl *pt; 142 int n; 143 144 n = minor(devc); 145 /* For now we only map the lower 8 bits of the minor */ 146 if (n & ~0xff) 147 return (NODEV); 148 149 devc->si_flags &= ~SI_CHEAPCLONE; 150 151 pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO); 152 pt->devs = devs = make_dev(&pts_cdevsw, n, 153 UID_ROOT, GID_WHEEL, 0666, "tty%c%r", names[n / 32], n % 32); 154 pt->devc = devc; 155 156 devs->si_drv1 = devc->si_drv1 = pt; 157 devs->si_tty = devc->si_tty = &pt->pt_tty; 158 pt->pt_tty.t_dev = devs; 159 ttyregister(&pt->pt_tty); 160 return (devc); 161 } 162 163 /*ARGSUSED*/ 164 static int 165 ptsopen(dev, flag, devtype, td) 166 dev_t dev; 167 int flag, devtype; 168 struct thread *td; 169 { 170 struct tty *tp; 171 int error; 172 struct pt_ioctl *pti; 173 174 if (!dev->si_drv1) 175 return(ENXIO); 176 pti = dev->si_drv1; 177 tp = dev->si_tty; 178 if ((tp->t_state & TS_ISOPEN) == 0) { 179 ttychars(tp); /* Set up default chars */ 180 tp->t_iflag = TTYDEF_IFLAG; 181 tp->t_oflag = TTYDEF_OFLAG; 182 tp->t_lflag = TTYDEF_LFLAG; 183 tp->t_cflag = TTYDEF_CFLAG; 184 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 185 } else if (tp->t_state & TS_XCLUDE && suser(td)) { 186 return (EBUSY); 187 } else if (pti->pt_prison != td->td_ucred->cr_prison) { 188 return (EBUSY); 189 } 190 if (tp->t_oproc) /* Ctrlr still around. */ 191 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 192 while ((tp->t_state & TS_CARR_ON) == 0) { 193 if (flag&FNONBLOCK) 194 break; 195 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 196 "ptsopn", 0); 197 if (error) 198 return (error); 199 } 200 error = (*linesw[tp->t_line].l_open)(dev, tp); 201 if (error == 0) 202 ptcwakeup(tp, FREAD|FWRITE); 203 return (error); 204 } 205 206 static int 207 ptsclose(dev, flag, mode, td) 208 dev_t dev; 209 int flag, mode; 210 struct thread *td; 211 { 212 struct tty *tp; 213 int err; 214 215 tp = dev->si_tty; 216 err = (*linesw[tp->t_line].l_close)(tp, flag); 217 ptsstop(tp, FREAD|FWRITE); 218 (void) ttyclose(tp); 219 return (err); 220 } 221 222 static int 223 ptsread(dev, uio, flag) 224 dev_t dev; 225 struct uio *uio; 226 int flag; 227 { 228 struct thread *td = curthread; 229 struct proc *p = td->td_proc; 230 struct tty *tp = dev->si_tty; 231 struct pt_ioctl *pti = dev->si_drv1; 232 struct pgrp *pg; 233 int error = 0; 234 235 again: 236 if (pti->pt_flags & PF_REMOTE) { 237 while (isbackground(p, tp)) { 238 sx_slock(&proctree_lock); 239 PROC_LOCK(p); 240 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTIN) || 241 SIGISMEMBER(td->td_sigmask, SIGTTIN) || 242 p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) { 243 PROC_UNLOCK(p); 244 sx_sunlock(&proctree_lock); 245 return (EIO); 246 } 247 pg = p->p_pgrp; 248 PROC_UNLOCK(p); 249 PGRP_LOCK(pg); 250 sx_sunlock(&proctree_lock); 251 pgsignal(pg, SIGTTIN, 1); 252 PGRP_UNLOCK(pg); 253 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg", 254 0); 255 if (error) 256 return (error); 257 } 258 if (tp->t_canq.c_cc == 0) { 259 if (flag & IO_NDELAY) 260 return (EWOULDBLOCK); 261 error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, 262 "ptsin", 0); 263 if (error) 264 return (error); 265 goto again; 266 } 267 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 268 if (ureadc(getc(&tp->t_canq), uio) < 0) { 269 error = EFAULT; 270 break; 271 } 272 if (tp->t_canq.c_cc == 1) 273 (void) getc(&tp->t_canq); 274 if (tp->t_canq.c_cc) 275 return (error); 276 } else 277 if (tp->t_oproc) 278 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 279 ptcwakeup(tp, FWRITE); 280 return (error); 281 } 282 283 /* 284 * Write to pseudo-tty. 285 * Wakeups of controlling tty will happen 286 * indirectly, when tty driver calls ptsstart. 287 */ 288 static int 289 ptswrite(dev, uio, flag) 290 dev_t dev; 291 struct uio *uio; 292 int flag; 293 { 294 struct tty *tp; 295 296 tp = dev->si_tty; 297 if (tp->t_oproc == 0) 298 return (EIO); 299 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 300 } 301 302 /* 303 * Start output on pseudo-tty. 304 * Wake up process selecting or sleeping for input from controlling tty. 305 */ 306 static void 307 ptsstart(tp) 308 struct tty *tp; 309 { 310 struct pt_ioctl *pti = tp->t_dev->si_drv1; 311 312 if (tp->t_state & TS_TTSTOP) 313 return; 314 if (pti->pt_flags & PF_STOPPED) { 315 pti->pt_flags &= ~PF_STOPPED; 316 pti->pt_send = TIOCPKT_START; 317 } 318 ptcwakeup(tp, FREAD); 319 } 320 321 static void 322 ptcwakeup(tp, flag) 323 struct tty *tp; 324 int flag; 325 { 326 struct pt_ioctl *pti = tp->t_dev->si_drv1; 327 328 if (flag & FREAD) { 329 selwakeuppri(&pti->pt_selr, TTIPRI); 330 wakeup(TSA_PTC_READ(tp)); 331 } 332 if (flag & FWRITE) { 333 selwakeuppri(&pti->pt_selw, TTOPRI); 334 wakeup(TSA_PTC_WRITE(tp)); 335 } 336 } 337 338 static int 339 ptcopen(dev, flag, devtype, td) 340 dev_t dev; 341 int flag, devtype; 342 struct thread *td; 343 { 344 struct tty *tp; 345 struct pt_ioctl *pti; 346 347 if (!dev->si_drv1) 348 ptyinit(dev); 349 if (!dev->si_drv1) 350 return(ENXIO); 351 tp = dev->si_tty; 352 if (tp->t_oproc) 353 return (EIO); 354 tp->t_timeout = -1; 355 tp->t_oproc = ptsstart; 356 tp->t_stop = ptsstop; 357 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 358 tp->t_lflag &= ~EXTPROC; 359 pti = dev->si_drv1; 360 pti->pt_prison = td->td_ucred->cr_prison; 361 pti->pt_flags = 0; 362 pti->pt_send = 0; 363 pti->pt_ucntl = 0; 364 return (0); 365 } 366 367 static int 368 ptcclose(dev, flags, fmt, td) 369 dev_t dev; 370 int flags; 371 int fmt; 372 struct thread *td; 373 { 374 struct tty *tp; 375 376 tp = dev->si_tty; 377 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 378 379 /* 380 * XXX MDMBUF makes no sense for ptys but would inhibit the above 381 * l_modem(). CLOCAL makes sense but isn't supported. Special 382 * l_modem()s that ignore carrier drop make no sense for ptys but 383 * may be in use because other parts of the line discipline make 384 * sense for ptys. Recover by doing everything that a normal 385 * ttymodem() would have done except for sending a SIGHUP. 386 */ 387 if (tp->t_state & TS_ISOPEN) { 388 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 389 tp->t_state |= TS_ZOMBIE; 390 ttyflush(tp, FREAD | FWRITE); 391 } 392 393 tp->t_oproc = 0; /* mark closed */ 394 return (0); 395 } 396 397 static int 398 ptcread(dev, uio, flag) 399 dev_t dev; 400 struct uio *uio; 401 int flag; 402 { 403 struct tty *tp = dev->si_tty; 404 struct pt_ioctl *pti = dev->si_drv1; 405 char buf[BUFSIZ]; 406 int error = 0, cc; 407 408 /* 409 * We want to block until the slave 410 * is open, and there's something to read; 411 * but if we lost the slave or we're NBIO, 412 * then return the appropriate error instead. 413 */ 414 for (;;) { 415 if (tp->t_state&TS_ISOPEN) { 416 if (pti->pt_flags&PF_PKT && pti->pt_send) { 417 error = ureadc((int)pti->pt_send, uio); 418 if (error) 419 return (error); 420 if (pti->pt_send & TIOCPKT_IOCTL) { 421 cc = min(uio->uio_resid, 422 sizeof(tp->t_termios)); 423 uiomove(&tp->t_termios, cc, uio); 424 } 425 pti->pt_send = 0; 426 return (0); 427 } 428 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 429 error = ureadc((int)pti->pt_ucntl, uio); 430 if (error) 431 return (error); 432 pti->pt_ucntl = 0; 433 return (0); 434 } 435 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 436 break; 437 } 438 if ((tp->t_state & TS_CONNECTED) == 0) 439 return (0); /* EOF */ 440 if (flag & IO_NDELAY) 441 return (EWOULDBLOCK); 442 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 443 if (error) 444 return (error); 445 } 446 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 447 error = ureadc(0, uio); 448 while (uio->uio_resid > 0 && error == 0) { 449 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 450 if (cc <= 0) 451 break; 452 error = uiomove(buf, cc, uio); 453 } 454 ttwwakeup(tp); 455 return (error); 456 } 457 458 static void 459 ptsstop(tp, flush) 460 struct tty *tp; 461 int flush; 462 { 463 struct pt_ioctl *pti = tp->t_dev->si_drv1; 464 int flag; 465 466 /* note: FLUSHREAD and FLUSHWRITE already ok */ 467 if (flush == 0) { 468 flush = TIOCPKT_STOP; 469 pti->pt_flags |= PF_STOPPED; 470 } else 471 pti->pt_flags &= ~PF_STOPPED; 472 pti->pt_send |= flush; 473 /* change of perspective */ 474 flag = 0; 475 if (flush & FREAD) 476 flag |= FWRITE; 477 if (flush & FWRITE) 478 flag |= FREAD; 479 ptcwakeup(tp, flag); 480 } 481 482 static int 483 ptcpoll(dev, events, td) 484 dev_t dev; 485 int events; 486 struct thread *td; 487 { 488 struct tty *tp = dev->si_tty; 489 struct pt_ioctl *pti = dev->si_drv1; 490 int revents = 0; 491 int s; 492 493 if ((tp->t_state & TS_CONNECTED) == 0) 494 return (events & 495 (POLLHUP | POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM)); 496 497 /* 498 * Need to block timeouts (ttrstart). 499 */ 500 s = spltty(); 501 502 if (events & (POLLIN | POLLRDNORM)) 503 if ((tp->t_state & TS_ISOPEN) && 504 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || 505 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 506 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 507 revents |= events & (POLLIN | POLLRDNORM); 508 509 if (events & (POLLOUT | POLLWRNORM)) 510 if (tp->t_state & TS_ISOPEN && 511 ((pti->pt_flags & PF_REMOTE) ? 512 (tp->t_canq.c_cc == 0) : 513 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 514 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) 515 revents |= events & (POLLOUT | POLLWRNORM); 516 517 if (events & POLLHUP) 518 if ((tp->t_state & TS_CARR_ON) == 0) 519 revents |= POLLHUP; 520 521 if (revents == 0) { 522 if (events & (POLLIN | POLLRDNORM)) 523 selrecord(td, &pti->pt_selr); 524 525 if (events & (POLLOUT | POLLWRNORM)) 526 selrecord(td, &pti->pt_selw); 527 } 528 splx(s); 529 530 return (revents); 531 } 532 533 static int 534 ptcwrite(dev, uio, flag) 535 dev_t dev; 536 struct uio *uio; 537 int flag; 538 { 539 struct tty *tp = dev->si_tty; 540 u_char *cp = 0; 541 int cc = 0; 542 u_char locbuf[BUFSIZ]; 543 int cnt = 0; 544 struct pt_ioctl *pti = dev->si_drv1; 545 int error = 0; 546 547 again: 548 if ((tp->t_state&TS_ISOPEN) == 0) 549 goto block; 550 if (pti->pt_flags & PF_REMOTE) { 551 if (tp->t_canq.c_cc) 552 goto block; 553 while ((uio->uio_resid > 0 || cc > 0) && 554 tp->t_canq.c_cc < TTYHOG - 1) { 555 if (cc == 0) { 556 cc = min(uio->uio_resid, BUFSIZ); 557 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 558 cp = locbuf; 559 error = uiomove(cp, cc, uio); 560 if (error) 561 return (error); 562 /* check again for safety */ 563 if ((tp->t_state & TS_ISOPEN) == 0) { 564 /* adjust as usual */ 565 uio->uio_resid += cc; 566 return (EIO); 567 } 568 } 569 if (cc > 0) { 570 cc = b_to_q((char *)cp, cc, &tp->t_canq); 571 /* 572 * XXX we don't guarantee that the canq size 573 * is >= TTYHOG, so the above b_to_q() may 574 * leave some bytes uncopied. However, space 575 * is guaranteed for the null terminator if 576 * we don't fail here since (TTYHOG - 1) is 577 * not a multiple of CBSIZE. 578 */ 579 if (cc > 0) 580 break; 581 } 582 } 583 /* adjust for data copied in but not written */ 584 uio->uio_resid += cc; 585 (void) putc(0, &tp->t_canq); 586 ttwakeup(tp); 587 wakeup(TSA_PTS_READ(tp)); 588 return (0); 589 } 590 while (uio->uio_resid > 0 || cc > 0) { 591 if (cc == 0) { 592 cc = min(uio->uio_resid, BUFSIZ); 593 cp = locbuf; 594 error = uiomove(cp, cc, uio); 595 if (error) 596 return (error); 597 /* check again for safety */ 598 if ((tp->t_state & TS_ISOPEN) == 0) { 599 /* adjust for data copied in but not written */ 600 uio->uio_resid += cc; 601 return (EIO); 602 } 603 } 604 while (cc > 0) { 605 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 606 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) { 607 wakeup(TSA_HUP_OR_INPUT(tp)); 608 goto block; 609 } 610 (*linesw[tp->t_line].l_rint)(*cp++, tp); 611 cnt++; 612 cc--; 613 } 614 cc = 0; 615 } 616 return (0); 617 block: 618 /* 619 * Come here to wait for slave to open, for space 620 * in outq, or space in rawq, or an empty canq. 621 */ 622 if ((tp->t_state & TS_CONNECTED) == 0) { 623 /* adjust for data copied in but not written */ 624 uio->uio_resid += cc; 625 return (EIO); 626 } 627 if (flag & IO_NDELAY) { 628 /* adjust for data copied in but not written */ 629 uio->uio_resid += cc; 630 if (cnt == 0) 631 return (EWOULDBLOCK); 632 return (0); 633 } 634 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); 635 if (error) { 636 /* adjust for data copied in but not written */ 637 uio->uio_resid += cc; 638 return (error); 639 } 640 goto again; 641 } 642 643 /*ARGSUSED*/ 644 static int 645 ptyioctl(dev, cmd, data, flag, td) 646 dev_t dev; 647 u_long cmd; 648 caddr_t data; 649 int flag; 650 struct thread *td; 651 { 652 struct tty *tp = dev->si_tty; 653 struct pt_ioctl *pti = dev->si_drv1; 654 u_char *cc = tp->t_cc; 655 int stop, error; 656 657 if (devsw(dev)->d_open == ptcopen) { 658 switch (cmd) { 659 660 case TIOCGPGRP: 661 /* 662 * We avoid calling ttioctl on the controller since, 663 * in that case, tp must be the controlling terminal. 664 */ 665 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 666 return (0); 667 668 case TIOCPKT: 669 if (*(int *)data) { 670 if (pti->pt_flags & PF_UCNTL) 671 return (EINVAL); 672 pti->pt_flags |= PF_PKT; 673 } else 674 pti->pt_flags &= ~PF_PKT; 675 return (0); 676 677 case TIOCUCNTL: 678 if (*(int *)data) { 679 if (pti->pt_flags & PF_PKT) 680 return (EINVAL); 681 pti->pt_flags |= PF_UCNTL; 682 } else 683 pti->pt_flags &= ~PF_UCNTL; 684 return (0); 685 686 case TIOCREMOTE: 687 if (*(int *)data) 688 pti->pt_flags |= PF_REMOTE; 689 else 690 pti->pt_flags &= ~PF_REMOTE; 691 ttyflush(tp, FREAD|FWRITE); 692 return (0); 693 } 694 695 /* 696 * The rest of the ioctls shouldn't be called until 697 * the slave is open. 698 */ 699 if ((tp->t_state & TS_ISOPEN) == 0) 700 return (EAGAIN); 701 702 switch (cmd) { 703 #ifdef COMPAT_43 704 case TIOCSETP: 705 case TIOCSETN: 706 #endif 707 case TIOCSETD: 708 case TIOCSETA: 709 case TIOCSETAW: 710 case TIOCSETAF: 711 /* 712 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 713 * ttywflush(tp) will hang if there are characters in 714 * the outq. 715 */ 716 ndflush(&tp->t_outq, tp->t_outq.c_cc); 717 break; 718 719 case TIOCSIG: 720 if (*(unsigned int *)data >= NSIG || 721 *(unsigned int *)data == 0) 722 return(EINVAL); 723 if ((tp->t_lflag&NOFLSH) == 0) 724 ttyflush(tp, FREAD|FWRITE); 725 if (tp->t_pgrp != NULL) { 726 PGRP_LOCK(tp->t_pgrp); 727 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 728 PGRP_UNLOCK(tp->t_pgrp); 729 } 730 if ((*(unsigned int *)data == SIGINFO) && 731 ((tp->t_lflag&NOKERNINFO) == 0)) 732 ttyinfo(tp); 733 return(0); 734 } 735 } 736 if (cmd == TIOCEXT) { 737 /* 738 * When the EXTPROC bit is being toggled, we need 739 * to send an TIOCPKT_IOCTL if the packet driver 740 * is turned on. 741 */ 742 if (*(int *)data) { 743 if (pti->pt_flags & PF_PKT) { 744 pti->pt_send |= TIOCPKT_IOCTL; 745 ptcwakeup(tp, FREAD); 746 } 747 tp->t_lflag |= EXTPROC; 748 } else { 749 if ((tp->t_lflag & EXTPROC) && 750 (pti->pt_flags & PF_PKT)) { 751 pti->pt_send |= TIOCPKT_IOCTL; 752 ptcwakeup(tp, FREAD); 753 } 754 tp->t_lflag &= ~EXTPROC; 755 } 756 return(0); 757 } 758 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td); 759 if (error == ENOIOCTL) 760 error = ttioctl(tp, cmd, data, flag); 761 if (error == ENOIOCTL) { 762 if (pti->pt_flags & PF_UCNTL && 763 (cmd & ~0xff) == UIOCCMD(0)) { 764 if (cmd & 0xff) { 765 pti->pt_ucntl = (u_char)cmd; 766 ptcwakeup(tp, FREAD); 767 } 768 return (0); 769 } 770 error = ENOTTY; 771 } 772 /* 773 * If external processing and packet mode send ioctl packet. 774 */ 775 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 776 switch(cmd) { 777 case TIOCSETA: 778 case TIOCSETAW: 779 case TIOCSETAF: 780 #ifdef COMPAT_43 781 case TIOCSETP: 782 case TIOCSETN: 783 #endif 784 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 785 case TIOCSETC: 786 case TIOCSLTC: 787 case TIOCLBIS: 788 case TIOCLBIC: 789 case TIOCLSET: 790 #endif 791 pti->pt_send |= TIOCPKT_IOCTL; 792 ptcwakeup(tp, FREAD); 793 break; 794 default: 795 break; 796 } 797 } 798 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 799 && CCEQ(cc[VSTART], CTRL('q')); 800 if (pti->pt_flags & PF_NOSTOP) { 801 if (stop) { 802 pti->pt_send &= ~TIOCPKT_NOSTOP; 803 pti->pt_send |= TIOCPKT_DOSTOP; 804 pti->pt_flags &= ~PF_NOSTOP; 805 ptcwakeup(tp, FREAD); 806 } 807 } else { 808 if (!stop) { 809 pti->pt_send &= ~TIOCPKT_DOSTOP; 810 pti->pt_send |= TIOCPKT_NOSTOP; 811 pti->pt_flags |= PF_NOSTOP; 812 ptcwakeup(tp, FREAD); 813 } 814 } 815 return (error); 816 } 817 818 819 static void ptc_drvinit(void *unused); 820 821 static void pty_clone(void *arg, char *name, int namelen, dev_t *dev); 822 823 static void 824 pty_clone(arg, name, namelen, dev) 825 void *arg; 826 char *name; 827 int namelen; 828 dev_t *dev; 829 { 830 int u; 831 832 if (*dev != NODEV) 833 return; 834 if (bcmp(name, "pty", 3) != 0) 835 return; 836 if (name[5] != '\0') 837 return; 838 switch (name[3]) { 839 case 'p': u = 0; break; 840 case 'q': u = 32; break; 841 case 'r': u = 64; break; 842 case 's': u = 96; break; 843 case 'P': u = 128; break; 844 case 'Q': u = 160; break; 845 case 'R': u = 192; break; 846 case 'S': u = 224; break; 847 default: return; 848 } 849 if (name[4] >= '' && name[4] <= '9') 850 u += name[4] - ''; 851 else if (name[4] >= 'a' && name[4] <= 'v') 852 u += name[4] - 'a' + 10; 853 else 854 return; 855 *dev = make_dev(&ptc_cdevsw, u, 856 UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32); 857 (*dev)->si_flags |= SI_CHEAPCLONE; 858 return; 859 } 860 861 static void 862 ptc_drvinit(unused) 863 void *unused; 864 { 865 866 EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000); 867 } 868 869 SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)
Cache object: d78da152d33da9982ba1a0dcdeab72e9
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