pty.c revision 111741
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 111741 2003-03-02 15:50:23Z des $ 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(&tp->t_termios, cc, uio); 429 } 430 pti->pt_send = 0; 431 return (0); 432 } 433 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 434 error = ureadc((int)pti->pt_ucntl, uio); 435 if (error) 436 return (error); 437 pti->pt_ucntl = 0; 438 return (0); 439 } 440 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 441 break; 442 } 443 if ((tp->t_state & TS_CONNECTED) == 0) 444 return (0); /* EOF */ 445 if (flag & IO_NDELAY) 446 return (EWOULDBLOCK); 447 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 448 if (error) 449 return (error); 450 } 451 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 452 error = ureadc(0, uio); 453 while (uio->uio_resid > 0 && error == 0) { 454 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 455 if (cc <= 0) 456 break; 457 error = uiomove(buf, cc, uio); 458 } 459 ttwwakeup(tp); 460 return (error); 461} 462 463static void 464ptsstop(tp, flush) 465 register struct tty *tp; 466 int flush; 467{ 468 struct pt_ioctl *pti = tp->t_dev->si_drv1; 469 int flag; 470 471 /* note: FLUSHREAD and FLUSHWRITE already ok */ 472 if (flush == 0) { 473 flush = TIOCPKT_STOP; 474 pti->pt_flags |= PF_STOPPED; 475 } else 476 pti->pt_flags &= ~PF_STOPPED; 477 pti->pt_send |= flush; 478 /* change of perspective */ 479 flag = 0; 480 if (flush & FREAD) 481 flag |= FWRITE; 482 if (flush & FWRITE) 483 flag |= FREAD; 484 ptcwakeup(tp, flag); 485} 486 487static int 488ptcpoll(dev, events, td) 489 dev_t dev; 490 int events; 491 struct thread *td; 492{ 493 register struct tty *tp = dev->si_tty; 494 struct pt_ioctl *pti = dev->si_drv1; 495 int revents = 0; 496 int s; 497 498 if ((tp->t_state & TS_CONNECTED) == 0) 499 return (seltrue(dev, events, td) | POLLHUP); 500 501 /* 502 * Need to block timeouts (ttrstart). 503 */ 504 s = spltty(); 505 506 if (events & (POLLIN | POLLRDNORM)) 507 if ((tp->t_state & TS_ISOPEN) && 508 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || 509 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 510 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 511 revents |= events & (POLLIN | POLLRDNORM); 512 513 if (events & (POLLOUT | POLLWRNORM)) 514 if (tp->t_state & TS_ISOPEN && 515 ((pti->pt_flags & PF_REMOTE) ? 516 (tp->t_canq.c_cc == 0) : 517 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 518 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) 519 revents |= events & (POLLOUT | POLLWRNORM); 520 521 if (events & POLLHUP) 522 if ((tp->t_state & TS_CARR_ON) == 0) 523 revents |= POLLHUP; 524 525 if (revents == 0) { 526 if (events & (POLLIN | POLLRDNORM)) 527 selrecord(td, &pti->pt_selr); 528 529 if (events & (POLLOUT | POLLWRNORM)) 530 selrecord(td, &pti->pt_selw); 531 } 532 splx(s); 533 534 return (revents); 535} 536 537static int 538ptcwrite(dev, uio, flag) 539 dev_t dev; 540 register struct uio *uio; 541 int flag; 542{ 543 register struct tty *tp = dev->si_tty; 544 register u_char *cp = 0; 545 register int cc = 0; 546 u_char locbuf[BUFSIZ]; 547 int cnt = 0; 548 struct pt_ioctl *pti = dev->si_drv1; 549 int error = 0; 550 551again: 552 if ((tp->t_state&TS_ISOPEN) == 0) 553 goto block; 554 if (pti->pt_flags & PF_REMOTE) { 555 if (tp->t_canq.c_cc) 556 goto block; 557 while ((uio->uio_resid > 0 || cc > 0) && 558 tp->t_canq.c_cc < TTYHOG - 1) { 559 if (cc == 0) { 560 cc = min(uio->uio_resid, BUFSIZ); 561 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 562 cp = locbuf; 563 error = uiomove(cp, cc, uio); 564 if (error) 565 return (error); 566 /* check again for safety */ 567 if ((tp->t_state & TS_ISOPEN) == 0) { 568 /* adjust as usual */ 569 uio->uio_resid += cc; 570 return (EIO); 571 } 572 } 573 if (cc > 0) { 574 cc = b_to_q((char *)cp, cc, &tp->t_canq); 575 /* 576 * XXX we don't guarantee that the canq size 577 * is >= TTYHOG, so the above b_to_q() may 578 * leave some bytes uncopied. However, space 579 * is guaranteed for the null terminator if 580 * we don't fail here since (TTYHOG - 1) is 581 * not a multiple of CBSIZE. 582 */ 583 if (cc > 0) 584 break; 585 } 586 } 587 /* adjust for data copied in but not written */ 588 uio->uio_resid += cc; 589 (void) putc(0, &tp->t_canq); 590 ttwakeup(tp); 591 wakeup(TSA_PTS_READ(tp)); 592 return (0); 593 } 594 while (uio->uio_resid > 0 || cc > 0) { 595 if (cc == 0) { 596 cc = min(uio->uio_resid, BUFSIZ); 597 cp = locbuf; 598 error = uiomove(cp, cc, uio); 599 if (error) 600 return (error); 601 /* check again for safety */ 602 if ((tp->t_state & TS_ISOPEN) == 0) { 603 /* adjust for data copied in but not written */ 604 uio->uio_resid += cc; 605 return (EIO); 606 } 607 } 608 while (cc > 0) { 609 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 610 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) { 611 wakeup(TSA_HUP_OR_INPUT(tp)); 612 goto block; 613 } 614 (*linesw[tp->t_line].l_rint)(*cp++, tp); 615 cnt++; 616 cc--; 617 } 618 cc = 0; 619 } 620 return (0); 621block: 622 /* 623 * Come here to wait for slave to open, for space 624 * in outq, or space in rawq, or an empty canq. 625 */ 626 if ((tp->t_state & TS_CONNECTED) == 0) { 627 /* adjust for data copied in but not written */ 628 uio->uio_resid += cc; 629 return (EIO); 630 } 631 if (flag & IO_NDELAY) { 632 /* adjust for data copied in but not written */ 633 uio->uio_resid += cc; 634 if (cnt == 0) 635 return (EWOULDBLOCK); 636 return (0); 637 } 638 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); 639 if (error) { 640 /* adjust for data copied in but not written */ 641 uio->uio_resid += cc; 642 return (error); 643 } 644 goto again; 645} 646 647/*ARGSUSED*/ 648static int 649ptyioctl(dev, cmd, data, flag, td) 650 dev_t dev; 651 u_long cmd; 652 caddr_t data; 653 int flag; 654 struct thread *td; 655{ 656 register struct tty *tp = dev->si_tty; 657 register struct pt_ioctl *pti = dev->si_drv1; 658 register u_char *cc = tp->t_cc; 659 int stop, error; 660 661 if (devsw(dev)->d_open == ptcopen) { 662 switch (cmd) { 663 664 case TIOCGPGRP: 665 /* 666 * We avoid calling ttioctl on the controller since, 667 * in that case, tp must be the controlling terminal. 668 */ 669 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 670 return (0); 671 672 case TIOCPKT: 673 if (*(int *)data) { 674 if (pti->pt_flags & PF_UCNTL) 675 return (EINVAL); 676 pti->pt_flags |= PF_PKT; 677 } else 678 pti->pt_flags &= ~PF_PKT; 679 return (0); 680 681 case TIOCUCNTL: 682 if (*(int *)data) { 683 if (pti->pt_flags & PF_PKT) 684 return (EINVAL); 685 pti->pt_flags |= PF_UCNTL; 686 } else 687 pti->pt_flags &= ~PF_UCNTL; 688 return (0); 689 690 case TIOCREMOTE: 691 if (*(int *)data) 692 pti->pt_flags |= PF_REMOTE; 693 else 694 pti->pt_flags &= ~PF_REMOTE; 695 ttyflush(tp, FREAD|FWRITE); 696 return (0); 697 } 698 699 /* 700 * The rest of the ioctls shouldn't be called until 701 * the slave is open. 702 */ 703 if ((tp->t_state & TS_ISOPEN) == 0) 704 return (EAGAIN); 705 706 switch (cmd) { 707#ifdef COMPAT_43 708 case TIOCSETP: 709 case TIOCSETN: 710#endif 711 case TIOCSETD: 712 case TIOCSETA: 713 case TIOCSETAW: 714 case TIOCSETAF: 715 /* 716 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 717 * ttywflush(tp) will hang if there are characters in 718 * the outq. 719 */ 720 ndflush(&tp->t_outq, tp->t_outq.c_cc); 721 break; 722 723 case TIOCSIG: 724 if (*(unsigned int *)data >= NSIG || 725 *(unsigned int *)data == 0) 726 return(EINVAL); 727 if ((tp->t_lflag&NOFLSH) == 0) 728 ttyflush(tp, FREAD|FWRITE); 729 if (tp->t_pgrp != NULL) { 730 PGRP_LOCK(tp->t_pgrp); 731 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 732 PGRP_UNLOCK(tp->t_pgrp); 733 } 734 if ((*(unsigned int *)data == SIGINFO) && 735 ((tp->t_lflag&NOKERNINFO) == 0)) 736 ttyinfo(tp); 737 return(0); 738 } 739 } 740 if (cmd == TIOCEXT) { 741 /* 742 * When the EXTPROC bit is being toggled, we need 743 * to send an TIOCPKT_IOCTL if the packet driver 744 * is turned on. 745 */ 746 if (*(int *)data) { 747 if (pti->pt_flags & PF_PKT) { 748 pti->pt_send |= TIOCPKT_IOCTL; 749 ptcwakeup(tp, FREAD); 750 } 751 tp->t_lflag |= EXTPROC; 752 } else { 753 if ((tp->t_lflag & EXTPROC) && 754 (pti->pt_flags & PF_PKT)) { 755 pti->pt_send |= TIOCPKT_IOCTL; 756 ptcwakeup(tp, FREAD); 757 } 758 tp->t_lflag &= ~EXTPROC; 759 } 760 return(0); 761 } 762 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td); 763 if (error == ENOIOCTL) 764 error = ttioctl(tp, cmd, data, flag); 765 if (error == ENOIOCTL) { 766 if (pti->pt_flags & PF_UCNTL && 767 (cmd & ~0xff) == UIOCCMD(0)) { 768 if (cmd & 0xff) { 769 pti->pt_ucntl = (u_char)cmd; 770 ptcwakeup(tp, FREAD); 771 } 772 return (0); 773 } 774 error = ENOTTY; 775 } 776 /* 777 * If external processing and packet mode send ioctl packet. 778 */ 779 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 780 switch(cmd) { 781 case TIOCSETA: 782 case TIOCSETAW: 783 case TIOCSETAF: 784#ifdef COMPAT_43 785 case TIOCSETP: 786 case TIOCSETN: 787#endif 788#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 789 case TIOCSETC: 790 case TIOCSLTC: 791 case TIOCLBIS: 792 case TIOCLBIC: 793 case TIOCLSET: 794#endif 795 pti->pt_send |= TIOCPKT_IOCTL; 796 ptcwakeup(tp, FREAD); 797 default: 798 break; 799 } 800 } 801 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 802 && CCEQ(cc[VSTART], CTRL('q')); 803 if (pti->pt_flags & PF_NOSTOP) { 804 if (stop) { 805 pti->pt_send &= ~TIOCPKT_NOSTOP; 806 pti->pt_send |= TIOCPKT_DOSTOP; 807 pti->pt_flags &= ~PF_NOSTOP; 808 ptcwakeup(tp, FREAD); 809 } 810 } else { 811 if (!stop) { 812 pti->pt_send &= ~TIOCPKT_DOSTOP; 813 pti->pt_send |= TIOCPKT_NOSTOP; 814 pti->pt_flags |= PF_NOSTOP; 815 ptcwakeup(tp, FREAD); 816 } 817 } 818 return (error); 819} 820 821 822static void ptc_drvinit(void *unused); 823 824static void pty_clone(void *arg, char *name, int namelen, dev_t *dev); 825 826static void 827pty_clone(arg, name, namelen, dev) 828 void *arg; 829 char *name; 830 int namelen; 831 dev_t *dev; 832{ 833 int u; 834 835 if (*dev != NODEV) 836 return; 837 if (bcmp(name, "pty", 3) != 0) 838 return; 839 if (name[5] != '\0') 840 return; 841 switch (name[3]) { 842 case 'p': u = 0; break; 843 case 'q': u = 32; break; 844 case 'r': u = 64; break; 845 case 's': u = 96; break; 846 case 'P': u = 128; break; 847 case 'Q': u = 160; break; 848 case 'R': u = 192; break; 849 case 'S': u = 224; break; 850 default: return; 851 } 852 if (name[4] >= '0' && name[4] <= '9') 853 u += name[4] - '0'; 854 else if (name[4] >= 'a' && name[4] <= 'v') 855 u += name[4] - 'a' + 10; 856 else 857 return; 858 *dev = make_dev(&ptc_cdevsw, u, 859 UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32); 860 (*dev)->si_flags |= SI_CHEAPCLONE; 861 return; 862} 863 864static void 865ptc_drvinit(unused) 866 void *unused; 867{ 868 869 EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000); 870} 871 872SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL) 873