pty.c revision 111119
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 111119 2003-02-19 05:47:46Z imp $ 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(struct tty *tp); 63static void ptsstop(struct tty *tp, int rw); 64static void ptcwakeup(struct tty *tp, int flag); 65static dev_t ptyinit(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(td)) { 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 struct pgrp *pg; 238 int error = 0; 239 240again: 241 if (pti->pt_flags & PF_REMOTE) { 242 while (isbackground(p, tp)) { 243 sx_slock(&proctree_lock); 244 PROC_LOCK(p); 245 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) || 246 SIGISMEMBER(p->p_sigmask, SIGTTIN) || 247 p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) { 248 PROC_UNLOCK(p); 249 sx_sunlock(&proctree_lock); 250 return (EIO); 251 } 252 pg = p->p_pgrp; 253 PROC_UNLOCK(p); 254 PGRP_LOCK(pg); 255 sx_sunlock(&proctree_lock); 256 pgsignal(pg, SIGTTIN, 1); 257 PGRP_UNLOCK(pg); 258 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg", 259 0); 260 if (error) 261 return (error); 262 } 263 if (tp->t_canq.c_cc == 0) { 264 if (flag & IO_NDELAY) 265 return (EWOULDBLOCK); 266 error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, 267 "ptsin", 0); 268 if (error) 269 return (error); 270 goto again; 271 } 272 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 273 if (ureadc(getc(&tp->t_canq), uio) < 0) { 274 error = EFAULT; 275 break; 276 } 277 if (tp->t_canq.c_cc == 1) 278 (void) getc(&tp->t_canq); 279 if (tp->t_canq.c_cc) 280 return (error); 281 } else 282 if (tp->t_oproc) 283 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 284 ptcwakeup(tp, FWRITE); 285 return (error); 286} 287 288/* 289 * Write to pseudo-tty. 290 * Wakeups of controlling tty will happen 291 * indirectly, when tty driver calls ptsstart. 292 */ 293static int 294ptswrite(dev, uio, flag) 295 dev_t dev; 296 struct uio *uio; 297 int flag; 298{ 299 register struct tty *tp; 300 301 tp = dev->si_tty; 302 if (tp->t_oproc == 0) 303 return (EIO); 304 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 305} 306 307/* 308 * Start output on pseudo-tty. 309 * Wake up process selecting or sleeping for input from controlling tty. 310 */ 311static void 312ptsstart(tp) 313 struct tty *tp; 314{ 315 register struct pt_ioctl *pti = tp->t_dev->si_drv1; 316 317 if (tp->t_state & TS_TTSTOP) 318 return; 319 if (pti->pt_flags & PF_STOPPED) { 320 pti->pt_flags &= ~PF_STOPPED; 321 pti->pt_send = TIOCPKT_START; 322 } 323 ptcwakeup(tp, FREAD); 324} 325 326static void 327ptcwakeup(tp, flag) 328 struct tty *tp; 329 int flag; 330{ 331 struct pt_ioctl *pti = tp->t_dev->si_drv1; 332 333 if (flag & FREAD) { 334 selwakeup(&pti->pt_selr); 335 wakeup(TSA_PTC_READ(tp)); 336 } 337 if (flag & FWRITE) { 338 selwakeup(&pti->pt_selw); 339 wakeup(TSA_PTC_WRITE(tp)); 340 } 341} 342 343static int 344ptcopen(dev, flag, devtype, td) 345 dev_t dev; 346 int flag, devtype; 347 struct thread *td; 348{ 349 register struct tty *tp; 350 struct pt_ioctl *pti; 351 352 if (!dev->si_drv1) 353 ptyinit(dev); 354 if (!dev->si_drv1) 355 return(ENXIO); 356 tp = dev->si_tty; 357 if (tp->t_oproc) 358 return (EIO); 359 tp->t_timeout = -1; 360 tp->t_oproc = ptsstart; 361 tp->t_stop = ptsstop; 362 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 363 tp->t_lflag &= ~EXTPROC; 364 pti = dev->si_drv1; 365 pti->pt_prison = td->td_ucred->cr_prison; 366 pti->pt_flags = 0; 367 pti->pt_send = 0; 368 pti->pt_ucntl = 0; 369 return (0); 370} 371 372static int 373ptcclose(dev, flags, fmt, td) 374 dev_t dev; 375 int flags; 376 int fmt; 377 struct thread *td; 378{ 379 register struct tty *tp; 380 381 tp = dev->si_tty; 382 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 383 384 /* 385 * XXX MDMBUF makes no sense for ptys but would inhibit the above 386 * l_modem(). CLOCAL makes sense but isn't supported. Special 387 * l_modem()s that ignore carrier drop make no sense for ptys but 388 * may be in use because other parts of the line discipline make 389 * sense for ptys. Recover by doing everything that a normal 390 * ttymodem() would have done except for sending a SIGHUP. 391 */ 392 if (tp->t_state & TS_ISOPEN) { 393 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 394 tp->t_state |= TS_ZOMBIE; 395 ttyflush(tp, FREAD | FWRITE); 396 } 397 398 tp->t_oproc = 0; /* mark closed */ 399 return (0); 400} 401 402static int 403ptcread(dev, uio, flag) 404 dev_t dev; 405 struct uio *uio; 406 int flag; 407{ 408 register struct tty *tp = dev->si_tty; 409 struct pt_ioctl *pti = dev->si_drv1; 410 char buf[BUFSIZ]; 411 int error = 0, cc; 412 413 /* 414 * We want to block until the slave 415 * is open, and there's something to read; 416 * but if we lost the slave or we're NBIO, 417 * then return the appropriate error instead. 418 */ 419 for (;;) { 420 if (tp->t_state&TS_ISOPEN) { 421 if (pti->pt_flags&PF_PKT && pti->pt_send) { 422 error = ureadc((int)pti->pt_send, uio); 423 if (error) 424 return (error); 425 if (pti->pt_send & TIOCPKT_IOCTL) { 426 cc = min(uio->uio_resid, 427 sizeof(tp->t_termios)); 428 uiomove((caddr_t)&tp->t_termios, cc, 429 uio); 430 } 431 pti->pt_send = 0; 432 return (0); 433 } 434 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 435 error = ureadc((int)pti->pt_ucntl, uio); 436 if (error) 437 return (error); 438 pti->pt_ucntl = 0; 439 return (0); 440 } 441 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 442 break; 443 } 444 if ((tp->t_state & TS_CONNECTED) == 0) 445 return (0); /* EOF */ 446 if (flag & IO_NDELAY) 447 return (EWOULDBLOCK); 448 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 449 if (error) 450 return (error); 451 } 452 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 453 error = ureadc(0, uio); 454 while (uio->uio_resid > 0 && error == 0) { 455 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 456 if (cc <= 0) 457 break; 458 error = uiomove(buf, cc, uio); 459 } 460 ttwwakeup(tp); 461 return (error); 462} 463 464static void 465ptsstop(tp, flush) 466 register struct tty *tp; 467 int flush; 468{ 469 struct pt_ioctl *pti = tp->t_dev->si_drv1; 470 int flag; 471 472 /* note: FLUSHREAD and FLUSHWRITE already ok */ 473 if (flush == 0) { 474 flush = TIOCPKT_STOP; 475 pti->pt_flags |= PF_STOPPED; 476 } else 477 pti->pt_flags &= ~PF_STOPPED; 478 pti->pt_send |= flush; 479 /* change of perspective */ 480 flag = 0; 481 if (flush & FREAD) 482 flag |= FWRITE; 483 if (flush & FWRITE) 484 flag |= FREAD; 485 ptcwakeup(tp, flag); 486} 487 488static int 489ptcpoll(dev, events, td) 490 dev_t dev; 491 int events; 492 struct thread *td; 493{ 494 register struct tty *tp = dev->si_tty; 495 struct pt_ioctl *pti = dev->si_drv1; 496 int revents = 0; 497 int s; 498 499 if ((tp->t_state & TS_CONNECTED) == 0) 500 return (seltrue(dev, events, td) | POLLHUP); 501 502 /* 503 * Need to block timeouts (ttrstart). 504 */ 505 s = spltty(); 506 507 if (events & (POLLIN | POLLRDNORM)) 508 if ((tp->t_state & TS_ISOPEN) && 509 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || 510 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 511 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 512 revents |= events & (POLLIN | POLLRDNORM); 513 514 if (events & (POLLOUT | POLLWRNORM)) 515 if (tp->t_state & TS_ISOPEN && 516 ((pti->pt_flags & PF_REMOTE) ? 517 (tp->t_canq.c_cc == 0) : 518 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 519 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) 520 revents |= events & (POLLOUT | POLLWRNORM); 521 522 if (events & POLLHUP) 523 if ((tp->t_state & TS_CARR_ON) == 0) 524 revents |= POLLHUP; 525 526 if (revents == 0) { 527 if (events & (POLLIN | POLLRDNORM)) 528 selrecord(td, &pti->pt_selr); 529 530 if (events & (POLLOUT | POLLWRNORM)) 531 selrecord(td, &pti->pt_selw); 532 } 533 splx(s); 534 535 return (revents); 536} 537 538static int 539ptcwrite(dev, uio, flag) 540 dev_t dev; 541 register struct uio *uio; 542 int flag; 543{ 544 register struct tty *tp = dev->si_tty; 545 register u_char *cp = 0; 546 register int cc = 0; 547 u_char locbuf[BUFSIZ]; 548 int cnt = 0; 549 struct pt_ioctl *pti = dev->si_drv1; 550 int error = 0; 551 552again: 553 if ((tp->t_state&TS_ISOPEN) == 0) 554 goto block; 555 if (pti->pt_flags & PF_REMOTE) { 556 if (tp->t_canq.c_cc) 557 goto block; 558 while ((uio->uio_resid > 0 || cc > 0) && 559 tp->t_canq.c_cc < TTYHOG - 1) { 560 if (cc == 0) { 561 cc = min(uio->uio_resid, BUFSIZ); 562 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 563 cp = locbuf; 564 error = uiomove((caddr_t)cp, cc, uio); 565 if (error) 566 return (error); 567 /* check again for safety */ 568 if ((tp->t_state & TS_ISOPEN) == 0) { 569 /* adjust as usual */ 570 uio->uio_resid += cc; 571 return (EIO); 572 } 573 } 574 if (cc > 0) { 575 cc = b_to_q((char *)cp, cc, &tp->t_canq); 576 /* 577 * XXX we don't guarantee that the canq size 578 * is >= TTYHOG, so the above b_to_q() may 579 * leave some bytes uncopied. However, space 580 * is guaranteed for the null terminator if 581 * we don't fail here since (TTYHOG - 1) is 582 * not a multiple of CBSIZE. 583 */ 584 if (cc > 0) 585 break; 586 } 587 } 588 /* adjust for data copied in but not written */ 589 uio->uio_resid += cc; 590 (void) putc(0, &tp->t_canq); 591 ttwakeup(tp); 592 wakeup(TSA_PTS_READ(tp)); 593 return (0); 594 } 595 while (uio->uio_resid > 0 || cc > 0) { 596 if (cc == 0) { 597 cc = min(uio->uio_resid, BUFSIZ); 598 cp = locbuf; 599 error = uiomove((caddr_t)cp, cc, uio); 600 if (error) 601 return (error); 602 /* check again for safety */ 603 if ((tp->t_state & TS_ISOPEN) == 0) { 604 /* adjust for data copied in but not written */ 605 uio->uio_resid += cc; 606 return (EIO); 607 } 608 } 609 while (cc > 0) { 610 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 611 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) { 612 wakeup(TSA_HUP_OR_INPUT(tp)); 613 goto block; 614 } 615 (*linesw[tp->t_line].l_rint)(*cp++, tp); 616 cnt++; 617 cc--; 618 } 619 cc = 0; 620 } 621 return (0); 622block: 623 /* 624 * Come here to wait for slave to open, for space 625 * in outq, or space in rawq, or an empty canq. 626 */ 627 if ((tp->t_state & TS_CONNECTED) == 0) { 628 /* adjust for data copied in but not written */ 629 uio->uio_resid += cc; 630 return (EIO); 631 } 632 if (flag & IO_NDELAY) { 633 /* adjust for data copied in but not written */ 634 uio->uio_resid += cc; 635 if (cnt == 0) 636 return (EWOULDBLOCK); 637 return (0); 638 } 639 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); 640 if (error) { 641 /* adjust for data copied in but not written */ 642 uio->uio_resid += cc; 643 return (error); 644 } 645 goto again; 646} 647 648/*ARGSUSED*/ 649static int 650ptyioctl(dev, cmd, data, flag, td) 651 dev_t dev; 652 u_long cmd; 653 caddr_t data; 654 int flag; 655 struct thread *td; 656{ 657 register struct tty *tp = dev->si_tty; 658 register struct pt_ioctl *pti = dev->si_drv1; 659 register u_char *cc = tp->t_cc; 660 int stop, error; 661 662 if (devsw(dev)->d_open == ptcopen) { 663 switch (cmd) { 664 665 case TIOCGPGRP: 666 /* 667 * We avoid calling ttioctl on the controller since, 668 * in that case, tp must be the controlling terminal. 669 */ 670 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 671 return (0); 672 673 case TIOCPKT: 674 if (*(int *)data) { 675 if (pti->pt_flags & PF_UCNTL) 676 return (EINVAL); 677 pti->pt_flags |= PF_PKT; 678 } else 679 pti->pt_flags &= ~PF_PKT; 680 return (0); 681 682 case TIOCUCNTL: 683 if (*(int *)data) { 684 if (pti->pt_flags & PF_PKT) 685 return (EINVAL); 686 pti->pt_flags |= PF_UCNTL; 687 } else 688 pti->pt_flags &= ~PF_UCNTL; 689 return (0); 690 691 case TIOCREMOTE: 692 if (*(int *)data) 693 pti->pt_flags |= PF_REMOTE; 694 else 695 pti->pt_flags &= ~PF_REMOTE; 696 ttyflush(tp, FREAD|FWRITE); 697 return (0); 698 } 699 700 /* 701 * The rest of the ioctls shouldn't be called until 702 * the slave is open. 703 */ 704 if ((tp->t_state & TS_ISOPEN) == 0) 705 return (EAGAIN); 706 707 switch (cmd) { 708#ifdef COMPAT_43 709 case TIOCSETP: 710 case TIOCSETN: 711#endif 712 case TIOCSETD: 713 case TIOCSETA: 714 case TIOCSETAW: 715 case TIOCSETAF: 716 /* 717 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 718 * ttywflush(tp) will hang if there are characters in 719 * the outq. 720 */ 721 ndflush(&tp->t_outq, tp->t_outq.c_cc); 722 break; 723 724 case TIOCSIG: 725 if (*(unsigned int *)data >= NSIG || 726 *(unsigned int *)data == 0) 727 return(EINVAL); 728 if ((tp->t_lflag&NOFLSH) == 0) 729 ttyflush(tp, FREAD|FWRITE); 730 if (tp->t_pgrp != NULL) { 731 PGRP_LOCK(tp->t_pgrp); 732 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 733 PGRP_UNLOCK(tp->t_pgrp); 734 } 735 if ((*(unsigned int *)data == SIGINFO) && 736 ((tp->t_lflag&NOKERNINFO) == 0)) 737 ttyinfo(tp); 738 return(0); 739 } 740 } 741 if (cmd == TIOCEXT) { 742 /* 743 * When the EXTPROC bit is being toggled, we need 744 * to send an TIOCPKT_IOCTL if the packet driver 745 * is turned on. 746 */ 747 if (*(int *)data) { 748 if (pti->pt_flags & PF_PKT) { 749 pti->pt_send |= TIOCPKT_IOCTL; 750 ptcwakeup(tp, FREAD); 751 } 752 tp->t_lflag |= EXTPROC; 753 } else { 754 if ((tp->t_lflag & EXTPROC) && 755 (pti->pt_flags & PF_PKT)) { 756 pti->pt_send |= TIOCPKT_IOCTL; 757 ptcwakeup(tp, FREAD); 758 } 759 tp->t_lflag &= ~EXTPROC; 760 } 761 return(0); 762 } 763 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td); 764 if (error == ENOIOCTL) 765 error = ttioctl(tp, cmd, data, flag); 766 if (error == ENOIOCTL) { 767 if (pti->pt_flags & PF_UCNTL && 768 (cmd & ~0xff) == UIOCCMD(0)) { 769 if (cmd & 0xff) { 770 pti->pt_ucntl = (u_char)cmd; 771 ptcwakeup(tp, FREAD); 772 } 773 return (0); 774 } 775 error = ENOTTY; 776 } 777 /* 778 * If external processing and packet mode send ioctl packet. 779 */ 780 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 781 switch(cmd) { 782 case TIOCSETA: 783 case TIOCSETAW: 784 case TIOCSETAF: 785#ifdef COMPAT_43 786 case TIOCSETP: 787 case TIOCSETN: 788#endif 789#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 790 case TIOCSETC: 791 case TIOCSLTC: 792 case TIOCLBIS: 793 case TIOCLBIC: 794 case TIOCLSET: 795#endif 796 pti->pt_send |= TIOCPKT_IOCTL; 797 ptcwakeup(tp, FREAD); 798 default: 799 break; 800 } 801 } 802 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 803 && CCEQ(cc[VSTART], CTRL('q')); 804 if (pti->pt_flags & PF_NOSTOP) { 805 if (stop) { 806 pti->pt_send &= ~TIOCPKT_NOSTOP; 807 pti->pt_send |= TIOCPKT_DOSTOP; 808 pti->pt_flags &= ~PF_NOSTOP; 809 ptcwakeup(tp, FREAD); 810 } 811 } else { 812 if (!stop) { 813 pti->pt_send &= ~TIOCPKT_DOSTOP; 814 pti->pt_send |= TIOCPKT_NOSTOP; 815 pti->pt_flags |= PF_NOSTOP; 816 ptcwakeup(tp, FREAD); 817 } 818 } 819 return (error); 820} 821 822 823static void ptc_drvinit(void *unused); 824 825static void pty_clone(void *arg, char *name, int namelen, dev_t *dev); 826 827static void 828pty_clone(arg, name, namelen, dev) 829 void *arg; 830 char *name; 831 int namelen; 832 dev_t *dev; 833{ 834 int u; 835 836 if (*dev != NODEV) 837 return; 838 if (bcmp(name, "pty", 3) != 0) 839 return; 840 if (name[5] != '\0') 841 return; 842 switch (name[3]) { 843 case 'p': u = 0; break; 844 case 'q': u = 32; break; 845 case 'r': u = 64; break; 846 case 's': u = 96; break; 847 case 'P': u = 128; break; 848 case 'Q': u = 160; break; 849 case 'R': u = 192; break; 850 case 'S': u = 224; break; 851 default: return; 852 } 853 if (name[4] >= '0' && name[4] <= '9') 854 u += name[4] - '0'; 855 else if (name[4] >= 'a' && name[4] <= 'v') 856 u += name[4] - 'a' + 10; 857 else 858 return; 859 *dev = make_dev(&ptc_cdevsw, u, 860 UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32); 861 (*dev)->si_flags |= SI_CHEAPCLONE; 862 return; 863} 864 865static void 866ptc_drvinit(unused) 867 void *unused; 868{ 869 870 EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000); 871} 872 873SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL) 874