pty.c revision 91406
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: head/sys/kern/tty_pty.c 91406 2002-02-27 18:32:23Z jhb $ 35 */ 36 37/* 38 * Pseudo-teletype Driver 39 * (Actually two drivers, requiring two entries in 'cdevsw') 40 */ 41#include "opt_compat.h" 42#include <sys/param.h> 43#include <sys/systm.h> 44#include <sys/lock.h> 45#include <sys/mutex.h> 46#include <sys/sx.h> 47#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 48#include <sys/ioctl_compat.h> 49#endif 50#include <sys/proc.h> 51#include <sys/tty.h> 52#include <sys/conf.h> 53#include <sys/fcntl.h> 54#include <sys/poll.h> 55#include <sys/kernel.h> 56#include <sys/vnode.h> 57#include <sys/signalvar.h> 58#include <sys/malloc.h> 59 60static MALLOC_DEFINE(M_PTY, "ptys", "pty data structures"); 61 62static void ptsstart __P((struct tty *tp)); 63static void ptsstop __P((struct tty *tp, int rw)); 64static void ptcwakeup __P((struct tty *tp, int flag)); 65static dev_t ptyinit __P((dev_t cdev)); 66 67static d_open_t ptsopen; 68static d_close_t ptsclose; 69static d_read_t ptsread; 70static d_write_t ptswrite; 71static d_ioctl_t ptyioctl; 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 /* poll */ ttypoll, 86 /* mmap */ nommap, 87 /* strategy */ nostrategy, 88 /* name */ "pts", 89 /* maj */ CDEV_MAJOR_S, 90 /* dump */ nodump, 91 /* psize */ nopsize, 92 /* flags */ D_TTY | D_KQFILTER, 93 /* kqfilter */ ttykqfilter, 94}; 95 96#define CDEV_MAJOR_C 6 97static struct cdevsw ptc_cdevsw = { 98 /* open */ ptcopen, 99 /* close */ ptcclose, 100 /* read */ ptcread, 101 /* write */ ptcwrite, 102 /* ioctl */ ptyioctl, 103 /* poll */ ptcpoll, 104 /* mmap */ nommap, 105 /* strategy */ nostrategy, 106 /* name */ "ptc", 107 /* maj */ CDEV_MAJOR_C, 108 /* dump */ nodump, 109 /* psize */ nopsize, 110 /* flags */ D_TTY | D_KQFILTER, 111 /* kqfilter */ ttykqfilter, 112}; 113 114#define BUFSIZ 100 /* Chunk size iomoved to/from user */ 115 116struct 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 132static char *names = "pqrsPQRS"; 133/* 134 * This function creates and initializes a pts/ptc pair 135 * 136 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 137 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 138 * 139 * XXX: define and add mapping of upper minor bits to allow more 140 * than 256 ptys. 141 */ 142static dev_t 143ptyinit(dev_t devc) 144{ 145 dev_t devs; 146 struct pt_ioctl *pt; 147 int n; 148 149 n = minor(devc); 150 /* For now we only map the lower 8 bits of the minor */ 151 if (n & ~0xff) 152 return (NODEV); 153 154 devc->si_flags &= ~SI_CHEAPCLONE; 155 156 pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO); 157 pt->devs = devs = make_dev(&pts_cdevsw, n, 158 UID_ROOT, GID_WHEEL, 0666, "tty%c%r", names[n / 32], n % 32); 159 pt->devc = devc; 160 161 devs->si_drv1 = devc->si_drv1 = pt; 162 devs->si_tty = devc->si_tty = &pt->pt_tty; 163 pt->pt_tty.t_dev = devs; 164 ttyregister(&pt->pt_tty); 165 return (devc); 166} 167 168/*ARGSUSED*/ 169static int 170ptsopen(dev, flag, devtype, td) 171 dev_t dev; 172 int flag, devtype; 173 struct thread *td; 174{ 175 register struct tty *tp; 176 int error; 177 struct pt_ioctl *pti; 178 179 if (!dev->si_drv1) 180 return(ENXIO); 181 pti = dev->si_drv1; 182 tp = dev->si_tty; 183 if ((tp->t_state & TS_ISOPEN) == 0) { 184 ttychars(tp); /* Set up default chars */ 185 tp->t_iflag = TTYDEF_IFLAG; 186 tp->t_oflag = TTYDEF_OFLAG; 187 tp->t_lflag = TTYDEF_LFLAG; 188 tp->t_cflag = TTYDEF_CFLAG; 189 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 190 } else if (tp->t_state & TS_XCLUDE && suser_xxx(td->td_ucred, NULL, 0)) { 191 return (EBUSY); 192 } else if (pti->pt_prison != td->td_ucred->cr_prison) { 193 return (EBUSY); 194 } 195 if (tp->t_oproc) /* Ctrlr still around. */ 196 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 197 while ((tp->t_state & TS_CARR_ON) == 0) { 198 if (flag&FNONBLOCK) 199 break; 200 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 201 "ptsopn", 0); 202 if (error) 203 return (error); 204 } 205 error = (*linesw[tp->t_line].l_open)(dev, tp); 206 if (error == 0) 207 ptcwakeup(tp, FREAD|FWRITE); 208 return (error); 209} 210 211static int 212ptsclose(dev, flag, mode, td) 213 dev_t dev; 214 int flag, mode; 215 struct thread *td; 216{ 217 register struct tty *tp; 218 int err; 219 220 tp = dev->si_tty; 221 err = (*linesw[tp->t_line].l_close)(tp, flag); 222 ptsstop(tp, FREAD|FWRITE); 223 (void) ttyclose(tp); 224 return (err); 225} 226 227static int 228ptsread(dev, uio, flag) 229 dev_t dev; 230 struct uio *uio; 231 int flag; 232{ 233 struct thread *td = curthread; 234 struct proc *p = td->td_proc; 235 register struct tty *tp = dev->si_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 PGRPSESS_SLOCK(); 243 PROC_LOCK(p); 244 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) || 245 SIGISMEMBER(p->p_sigmask, SIGTTIN) || 246 p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) { 247 PROC_UNLOCK(p); 248 return (EIO); 249 } 250 PROC_UNLOCK(p); 251 PGRP_LOCK(p->p_pgrp); 252 PGRPSESS_SUNLOCK(); 253 pgsignal(p->p_pgrp, SIGTTIN, 1); 254 PGRP_UNLOCK(p->p_pgrp); 255 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg", 256 0); 257 if (error) 258 return (error); 259 } 260 if (tp->t_canq.c_cc == 0) { 261 if (flag & IO_NDELAY) 262 return (EWOULDBLOCK); 263 error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, 264 "ptsin", 0); 265 if (error) 266 return (error); 267 goto again; 268 } 269 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 270 if (ureadc(getc(&tp->t_canq), uio) < 0) { 271 error = EFAULT; 272 break; 273 } 274 if (tp->t_canq.c_cc == 1) 275 (void) getc(&tp->t_canq); 276 if (tp->t_canq.c_cc) 277 return (error); 278 } else 279 if (tp->t_oproc) 280 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 281 ptcwakeup(tp, FWRITE); 282 return (error); 283} 284 285/* 286 * Write to pseudo-tty. 287 * Wakeups of controlling tty will happen 288 * indirectly, when tty driver calls ptsstart. 289 */ 290static int 291ptswrite(dev, uio, flag) 292 dev_t dev; 293 struct uio *uio; 294 int flag; 295{ 296 register struct tty *tp; 297 298 tp = dev->si_tty; 299 if (tp->t_oproc == 0) 300 return (EIO); 301 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 302} 303 304/* 305 * Start output on pseudo-tty. 306 * Wake up process selecting or sleeping for input from controlling tty. 307 */ 308static void 309ptsstart(tp) 310 struct tty *tp; 311{ 312 register struct pt_ioctl *pti = tp->t_dev->si_drv1; 313 314 if (tp->t_state & TS_TTSTOP) 315 return; 316 if (pti->pt_flags & PF_STOPPED) { 317 pti->pt_flags &= ~PF_STOPPED; 318 pti->pt_send = TIOCPKT_START; 319 } 320 ptcwakeup(tp, FREAD); 321} 322 323static void 324ptcwakeup(tp, flag) 325 struct tty *tp; 326 int flag; 327{ 328 struct pt_ioctl *pti = tp->t_dev->si_drv1; 329 330 if (flag & FREAD) { 331 selwakeup(&pti->pt_selr); 332 wakeup(TSA_PTC_READ(tp)); 333 } 334 if (flag & FWRITE) { 335 selwakeup(&pti->pt_selw); 336 wakeup(TSA_PTC_WRITE(tp)); 337 } 338} 339 340static int 341ptcopen(dev, flag, devtype, td) 342 dev_t dev; 343 int flag, devtype; 344 struct thread *td; 345{ 346 register struct tty *tp; 347 struct pt_ioctl *pti; 348 349 if (!dev->si_drv1) 350 ptyinit(dev); 351 if (!dev->si_drv1) 352 return(ENXIO); 353 tp = dev->si_tty; 354 if (tp->t_oproc) 355 return (EIO); 356 tp->t_timeout = -1; 357 tp->t_oproc = ptsstart; 358 tp->t_stop = ptsstop; 359 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 360 tp->t_lflag &= ~EXTPROC; 361 pti = dev->si_drv1; 362 pti->pt_prison = td->td_ucred->cr_prison; 363 pti->pt_flags = 0; 364 pti->pt_send = 0; 365 pti->pt_ucntl = 0; 366 return (0); 367} 368 369static int 370ptcclose(dev, flags, fmt, td) 371 dev_t dev; 372 int flags; 373 int fmt; 374 struct thread *td; 375{ 376 register struct tty *tp; 377 378 tp = dev->si_tty; 379 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 380 381 /* 382 * XXX MDMBUF makes no sense for ptys but would inhibit the above 383 * l_modem(). CLOCAL makes sense but isn't supported. Special 384 * l_modem()s that ignore carrier drop make no sense for ptys but 385 * may be in use because other parts of the line discipline make 386 * sense for ptys. Recover by doing everything that a normal 387 * ttymodem() would have done except for sending a SIGHUP. 388 */ 389 if (tp->t_state & TS_ISOPEN) { 390 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 391 tp->t_state |= TS_ZOMBIE; 392 ttyflush(tp, FREAD | FWRITE); 393 } 394 395 tp->t_oproc = 0; /* mark closed */ 396 return (0); 397} 398 399static int 400ptcread(dev, uio, flag) 401 dev_t dev; 402 struct uio *uio; 403 int flag; 404{ 405 register struct tty *tp = dev->si_tty; 406 struct pt_ioctl *pti = dev->si_drv1; 407 char buf[BUFSIZ]; 408 int error = 0, cc; 409 410 /* 411 * We want to block until the slave 412 * is open, and there's something to read; 413 * but if we lost the slave or we're NBIO, 414 * then return the appropriate error instead. 415 */ 416 for (;;) { 417 if (tp->t_state&TS_ISOPEN) { 418 if (pti->pt_flags&PF_PKT && pti->pt_send) { 419 error = ureadc((int)pti->pt_send, uio); 420 if (error) 421 return (error); 422 if (pti->pt_send & TIOCPKT_IOCTL) { 423 cc = min(uio->uio_resid, 424 sizeof(tp->t_termios)); 425 uiomove((caddr_t)&tp->t_termios, cc, 426 uio); 427 } 428 pti->pt_send = 0; 429 return (0); 430 } 431 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 432 error = ureadc((int)pti->pt_ucntl, uio); 433 if (error) 434 return (error); 435 pti->pt_ucntl = 0; 436 return (0); 437 } 438 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 439 break; 440 } 441 if ((tp->t_state & TS_CONNECTED) == 0) 442 return (0); /* EOF */ 443 if (flag & IO_NDELAY) 444 return (EWOULDBLOCK); 445 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 446 if (error) 447 return (error); 448 } 449 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 450 error = ureadc(0, uio); 451 while (uio->uio_resid > 0 && error == 0) { 452 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 453 if (cc <= 0) 454 break; 455 error = uiomove(buf, cc, uio); 456 } 457 ttwwakeup(tp); 458 return (error); 459} 460 461static void 462ptsstop(tp, flush) 463 register struct tty *tp; 464 int flush; 465{ 466 struct pt_ioctl *pti = tp->t_dev->si_drv1; 467 int flag; 468 469 /* note: FLUSHREAD and FLUSHWRITE already ok */ 470 if (flush == 0) { 471 flush = TIOCPKT_STOP; 472 pti->pt_flags |= PF_STOPPED; 473 } else 474 pti->pt_flags &= ~PF_STOPPED; 475 pti->pt_send |= flush; 476 /* change of perspective */ 477 flag = 0; 478 if (flush & FREAD) 479 flag |= FWRITE; 480 if (flush & FWRITE) 481 flag |= FREAD; 482 ptcwakeup(tp, flag); 483} 484 485static int 486ptcpoll(dev, events, td) 487 dev_t dev; 488 int events; 489 struct thread *td; 490{ 491 register struct tty *tp = dev->si_tty; 492 struct pt_ioctl *pti = dev->si_drv1; 493 int revents = 0; 494 int s; 495 496 if ((tp->t_state & TS_CONNECTED) == 0) 497 return (seltrue(dev, events, td) | POLLHUP); 498 499 /* 500 * Need to block timeouts (ttrstart). 501 */ 502 s = spltty(); 503 504 if (events & (POLLIN | POLLRDNORM)) 505 if ((tp->t_state & TS_ISOPEN) && 506 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || 507 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 508 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 509 revents |= events & (POLLIN | POLLRDNORM); 510 511 if (events & (POLLOUT | POLLWRNORM)) 512 if (tp->t_state & TS_ISOPEN && 513 ((pti->pt_flags & PF_REMOTE) ? 514 (tp->t_canq.c_cc == 0) : 515 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 516 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) 517 revents |= events & (POLLOUT | POLLWRNORM); 518 519 if (events & POLLHUP) 520 if ((tp->t_state & TS_CARR_ON) == 0) 521 revents |= POLLHUP; 522 523 if (revents == 0) { 524 if (events & (POLLIN | POLLRDNORM)) 525 selrecord(td, &pti->pt_selr); 526 527 if (events & (POLLOUT | POLLWRNORM)) 528 selrecord(td, &pti->pt_selw); 529 } 530 splx(s); 531 532 return (revents); 533} 534 535static int 536ptcwrite(dev, uio, flag) 537 dev_t dev; 538 register struct uio *uio; 539 int flag; 540{ 541 register struct tty *tp = dev->si_tty; 542 register u_char *cp = 0; 543 register int cc = 0; 544 u_char locbuf[BUFSIZ]; 545 int cnt = 0; 546 struct pt_ioctl *pti = dev->si_drv1; 547 int error = 0; 548 549again: 550 if ((tp->t_state&TS_ISOPEN) == 0) 551 goto block; 552 if (pti->pt_flags & PF_REMOTE) { 553 if (tp->t_canq.c_cc) 554 goto block; 555 while ((uio->uio_resid > 0 || cc > 0) && 556 tp->t_canq.c_cc < TTYHOG - 1) { 557 if (cc == 0) { 558 cc = min(uio->uio_resid, BUFSIZ); 559 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 560 cp = locbuf; 561 error = uiomove((caddr_t)cp, cc, uio); 562 if (error) 563 return (error); 564 /* check again for safety */ 565 if ((tp->t_state & TS_ISOPEN) == 0) { 566 /* adjust as usual */ 567 uio->uio_resid += cc; 568 return (EIO); 569 } 570 } 571 if (cc > 0) { 572 cc = b_to_q((char *)cp, cc, &tp->t_canq); 573 /* 574 * XXX we don't guarantee that the canq size 575 * is >= TTYHOG, so the above b_to_q() may 576 * leave some bytes uncopied. However, space 577 * is guaranteed for the null terminator if 578 * we don't fail here since (TTYHOG - 1) is 579 * not a multiple of CBSIZE. 580 */ 581 if (cc > 0) 582 break; 583 } 584 } 585 /* adjust for data copied in but not written */ 586 uio->uio_resid += cc; 587 (void) putc(0, &tp->t_canq); 588 ttwakeup(tp); 589 wakeup(TSA_PTS_READ(tp)); 590 return (0); 591 } 592 while (uio->uio_resid > 0 || cc > 0) { 593 if (cc == 0) { 594 cc = min(uio->uio_resid, BUFSIZ); 595 cp = locbuf; 596 error = uiomove((caddr_t)cp, cc, uio); 597 if (error) 598 return (error); 599 /* check again for safety */ 600 if ((tp->t_state & TS_ISOPEN) == 0) { 601 /* adjust for data copied in but not written */ 602 uio->uio_resid += cc; 603 return (EIO); 604 } 605 } 606 while (cc > 0) { 607 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 608 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) { 609 wakeup(TSA_HUP_OR_INPUT(tp)); 610 goto block; 611 } 612 (*linesw[tp->t_line].l_rint)(*cp++, tp); 613 cnt++; 614 cc--; 615 } 616 cc = 0; 617 } 618 return (0); 619block: 620 /* 621 * Come here to wait for slave to open, for space 622 * in outq, or space in rawq, or an empty canq. 623 */ 624 if ((tp->t_state & TS_CONNECTED) == 0) { 625 /* adjust for data copied in but not written */ 626 uio->uio_resid += cc; 627 return (EIO); 628 } 629 if (flag & IO_NDELAY) { 630 /* adjust for data copied in but not written */ 631 uio->uio_resid += cc; 632 if (cnt == 0) 633 return (EWOULDBLOCK); 634 return (0); 635 } 636 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); 637 if (error) { 638 /* adjust for data copied in but not written */ 639 uio->uio_resid += cc; 640 return (error); 641 } 642 goto again; 643} 644 645/*ARGSUSED*/ 646static int 647ptyioctl(dev, cmd, data, flag, td) 648 dev_t dev; 649 u_long cmd; 650 caddr_t data; 651 int flag; 652 struct thread *td; 653{ 654 register struct tty *tp = dev->si_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 if (tp->t_pgrp != NULL) { 728 PGRP_LOCK(tp->t_pgrp); 729 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 730 PGRP_UNLOCK(tp->t_pgrp); 731 } 732 if ((*(unsigned int *)data == SIGINFO) && 733 ((tp->t_lflag&NOKERNINFO) == 0)) 734 ttyinfo(tp); 735 return(0); 736 } 737 } 738 if (cmd == TIOCEXT) { 739 /* 740 * When the EXTPROC bit is being toggled, we need 741 * to send an TIOCPKT_IOCTL if the packet driver 742 * is turned on. 743 */ 744 if (*(int *)data) { 745 if (pti->pt_flags & PF_PKT) { 746 pti->pt_send |= TIOCPKT_IOCTL; 747 ptcwakeup(tp, FREAD); 748 } 749 tp->t_lflag |= EXTPROC; 750 } else { 751 if ((tp->t_lflag & EXTPROC) && 752 (pti->pt_flags & PF_PKT)) { 753 pti->pt_send |= TIOCPKT_IOCTL; 754 ptcwakeup(tp, FREAD); 755 } 756 tp->t_lflag &= ~EXTPROC; 757 } 758 return(0); 759 } 760 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td); 761 if (error == ENOIOCTL) 762 error = ttioctl(tp, cmd, data, flag); 763 if (error == ENOIOCTL) { 764 if (pti->pt_flags & PF_UCNTL && 765 (cmd & ~0xff) == UIOCCMD(0)) { 766 if (cmd & 0xff) { 767 pti->pt_ucntl = (u_char)cmd; 768 ptcwakeup(tp, FREAD); 769 } 770 return (0); 771 } 772 error = ENOTTY; 773 } 774 /* 775 * If external processing and packet mode send ioctl packet. 776 */ 777 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 778 switch(cmd) { 779 case TIOCSETA: 780 case TIOCSETAW: 781 case TIOCSETAF: 782#ifdef COMPAT_43 783 case TIOCSETP: 784 case TIOCSETN: 785#endif 786#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 787 case TIOCSETC: 788 case TIOCSLTC: 789 case TIOCLBIS: 790 case TIOCLBIC: 791 case TIOCLSET: 792#endif 793 pti->pt_send |= TIOCPKT_IOCTL; 794 ptcwakeup(tp, FREAD); 795 default: 796 break; 797 } 798 } 799 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 800 && CCEQ(cc[VSTART], CTRL('q')); 801 if (pti->pt_flags & PF_NOSTOP) { 802 if (stop) { 803 pti->pt_send &= ~TIOCPKT_NOSTOP; 804 pti->pt_send |= TIOCPKT_DOSTOP; 805 pti->pt_flags &= ~PF_NOSTOP; 806 ptcwakeup(tp, FREAD); 807 } 808 } else { 809 if (!stop) { 810 pti->pt_send &= ~TIOCPKT_DOSTOP; 811 pti->pt_send |= TIOCPKT_NOSTOP; 812 pti->pt_flags |= PF_NOSTOP; 813 ptcwakeup(tp, FREAD); 814 } 815 } 816 return (error); 817} 818 819 820static void ptc_drvinit __P((void *unused)); 821 822static void pty_clone __P((void *arg, char *name, int namelen, dev_t *dev)); 823 824static void 825pty_clone(arg, name, namelen, dev) 826 void *arg; 827 char *name; 828 int namelen; 829 dev_t *dev; 830{ 831 int u; 832 833 if (*dev != NODEV) 834 return; 835 if (bcmp(name, "pty", 3) != 0) 836 return; 837 if (name[5] != '\0') 838 return; 839 switch (name[3]) { 840 case 'p': u = 0; break; 841 case 'q': u = 32; break; 842 case 'r': u = 64; break; 843 case 's': u = 96; break; 844 case 'P': u = 128; break; 845 case 'Q': u = 160; break; 846 case 'R': u = 192; break; 847 case 'S': u = 224; break; 848 default: return; 849 } 850 if (name[4] >= '0' && name[4] <= '9') 851 u += name[4] - '0'; 852 else if (name[4] >= 'a' && name[4] <= 'v') 853 u += name[4] - 'a' + 10; 854 else 855 return; 856 *dev = make_dev(&ptc_cdevsw, u, 857 UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32); 858 (*dev)->si_flags |= SI_CHEAPCLONE; 859 return; 860} 861 862static void 863ptc_drvinit(unused) 864 void *unused; 865{ 866 EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000); 867 cdevsw_add(&pts_cdevsw); 868 cdevsw_add(&ptc_cdevsw); 869} 870 871SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL) 872