pty.c revision 47301
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 * $Id: tty_pty.c,v 1.58 1999/05/14 20:44:20 luoqi Exp $ 35 */ 36 37/* 38 * Pseudo-teletype Driver 39 * (Actually two drivers, requiring two entries in 'cdevsw') 40 */ 41#include "pty.h" /* XXX */ 42#include "opt_compat.h" 43#include "opt_devfs.h" 44 45#include <sys/param.h> 46#include <sys/systm.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 59#ifdef DEVFS 60#include <sys/devfsext.h> 61#endif /*DEVFS*/ 62 63#ifdef notyet 64static void ptyattach __P((int n)); 65#endif 66static void ptsstart __P((struct tty *tp)); 67static void ptcwakeup __P((struct tty *tp, int flag)); 68 69static d_open_t ptsopen; 70static d_close_t ptsclose; 71static d_read_t ptsread; 72static d_write_t ptswrite; 73static d_ioctl_t ptyioctl; 74static d_stop_t ptsstop; 75static d_devtotty_t ptydevtotty; 76static d_open_t ptcopen; 77static d_close_t ptcclose; 78static d_read_t ptcread; 79static d_write_t ptcwrite; 80static d_poll_t ptcpoll; 81 82#define CDEV_MAJOR_S 5 83static struct cdevsw pts_cdevsw = { 84 ptsopen, ptsclose, ptsread, ptswrite, 85 ptyioctl, ptsstop, nullreset, ptydevtotty, 86 ttpoll, nommap, NULL, "pts", 87 NULL, -1, nodump, nopsize, 88 D_TTY, 89}; 90 91#define CDEV_MAJOR_C 6 92static struct cdevsw ptc_cdevsw = { 93 ptcopen, ptcclose, ptcread, ptcwrite, 94 ptyioctl, nullstop, nullreset, ptydevtotty, 95 ptcpoll, nommap, NULL, "ptc", 96 NULL, -1, nodump, nopsize, 97 D_TTY, 98}; 99 100#if NPTY == 1 101#undef NPTY 102#define NPTY 32 /* crude XXX */ 103#warning You have only one pty defined, redefining to 32. 104#endif 105 106#ifdef DEVFS 107#define MAXUNITS (8 * 32) 108static void *devfs_token_pts[MAXUNITS]; 109static void *devfs_token_ptc[MAXUNITS]; 110static const char jnames[] = "pqrsPQRS"; 111#if NPTY > MAXUNITS 112#undef NPTY 113#define NPTY MAXUNITS 114#warning Can't have more than 256 pty's with DEVFS defined. 115#endif 116#endif 117 118#define BUFSIZ 100 /* Chunk size iomoved to/from user */ 119 120/* 121 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 122 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 123 */ 124static struct tty pt_tty[NPTY]; /* XXX */ 125static struct pt_ioctl { 126 int pt_flags; 127 struct selinfo pt_selr, pt_selw; 128 u_char pt_send; 129 u_char pt_ucntl; 130} pt_ioctl[NPTY]; /* XXX */ 131static int npty = NPTY; /* for pstat -t */ 132 133#define PF_PKT 0x08 /* packet mode */ 134#define PF_STOPPED 0x10 /* user told stopped */ 135#define PF_REMOTE 0x20 /* remote and flow controlled input */ 136#define PF_NOSTOP 0x40 137#define PF_UCNTL 0x80 /* user control mode */ 138 139#ifdef notyet 140/* 141 * Establish n (or default if n is 1) ptys in the system. 142 * 143 * XXX cdevsw & pstat require the array `pty[]' to be an array 144 */ 145static void 146ptyattach(n) 147 int n; 148{ 149 char *mem; 150 register u_long ntb; 151#define DEFAULT_NPTY 32 152 153 /* maybe should allow 0 => none? */ 154 if (n <= 1) 155 n = DEFAULT_NPTY; 156 ntb = n * sizeof(struct tty); 157 mem = malloc(ntb + ALIGNBYTES + n * sizeof(struct pt_ioctl), 158 M_DEVBUF, M_WAITOK); 159 pt_tty = (struct tty *)mem; 160 mem = (char *)ALIGN(mem + ntb); 161 pt_ioctl = (struct pt_ioctl *)mem; 162 npty = n; 163} 164#endif 165 166/*ARGSUSED*/ 167static int 168ptsopen(dev, flag, devtype, p) 169 dev_t dev; 170 int flag, devtype; 171 struct proc *p; 172{ 173 register struct tty *tp; 174 int error; 175 176 if (minor(dev) >= npty) 177 return (ENXIO); 178 tp = &pt_tty[minor(dev)]; 179 if ((tp->t_state & TS_ISOPEN) == 0) { 180 ttychars(tp); /* Set up default chars */ 181 tp->t_iflag = TTYDEF_IFLAG; 182 tp->t_oflag = TTYDEF_OFLAG; 183 tp->t_lflag = TTYDEF_LFLAG; 184 tp->t_cflag = TTYDEF_CFLAG; 185 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 186 } else if (tp->t_state & TS_XCLUDE && suser(p)) 187 return (EBUSY); 188 if (tp->t_oproc) /* Ctrlr still around. */ 189 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 190 while ((tp->t_state & TS_CARR_ON) == 0) { 191 if (flag&FNONBLOCK) 192 break; 193 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 194 "ptsopn", 0); 195 if (error) 196 return (error); 197 } 198 error = (*linesw[tp->t_line].l_open)(dev, tp); 199 if (error == 0) 200 ptcwakeup(tp, FREAD|FWRITE); 201 return (error); 202} 203 204static int 205ptsclose(dev, flag, mode, p) 206 dev_t dev; 207 int flag, mode; 208 struct proc *p; 209{ 210 register struct tty *tp; 211 int err; 212 213 tp = &pt_tty[minor(dev)]; 214 err = (*linesw[tp->t_line].l_close)(tp, flag); 215 ptsstop(tp, FREAD|FWRITE); 216 (void) ttyclose(tp); 217 return (err); 218} 219 220static int 221ptsread(dev, uio, flag) 222 dev_t dev; 223 struct uio *uio; 224 int flag; 225{ 226 struct proc *p = curproc; 227 register struct tty *tp = &pt_tty[minor(dev)]; 228 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 229 int error = 0; 230 231again: 232 if (pti->pt_flags & PF_REMOTE) { 233 while (isbackground(p, tp)) { 234 if ((p->p_sigignore & sigmask(SIGTTIN)) || 235 (p->p_sigmask & sigmask(SIGTTIN)) || 236 p->p_pgrp->pg_jobc == 0 || 237 p->p_flag & P_PPWAIT) 238 return (EIO); 239 pgsignal(p->p_pgrp, SIGTTIN, 1); 240 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg", 241 0); 242 if (error) 243 return (error); 244 } 245 if (tp->t_canq.c_cc == 0) { 246 if (flag & IO_NDELAY) 247 return (EWOULDBLOCK); 248 error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, 249 "ptsin", 0); 250 if (error) 251 return (error); 252 goto again; 253 } 254 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 255 if (ureadc(getc(&tp->t_canq), uio) < 0) { 256 error = EFAULT; 257 break; 258 } 259 if (tp->t_canq.c_cc == 1) 260 (void) getc(&tp->t_canq); 261 if (tp->t_canq.c_cc) 262 return (error); 263 } else 264 if (tp->t_oproc) 265 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 266 ptcwakeup(tp, FWRITE); 267 return (error); 268} 269 270/* 271 * Write to pseudo-tty. 272 * Wakeups of controlling tty will happen 273 * indirectly, when tty driver calls ptsstart. 274 */ 275static int 276ptswrite(dev, uio, flag) 277 dev_t dev; 278 struct uio *uio; 279 int flag; 280{ 281 register struct tty *tp; 282 283 tp = &pt_tty[minor(dev)]; 284 if (tp->t_oproc == 0) 285 return (EIO); 286 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 287} 288 289/* 290 * Start output on pseudo-tty. 291 * Wake up process selecting or sleeping for input from controlling tty. 292 */ 293static void 294ptsstart(tp) 295 struct tty *tp; 296{ 297 register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 298 299 if (tp->t_state & TS_TTSTOP) 300 return; 301 if (pti->pt_flags & PF_STOPPED) { 302 pti->pt_flags &= ~PF_STOPPED; 303 pti->pt_send = TIOCPKT_START; 304 } 305 ptcwakeup(tp, FREAD); 306} 307 308static void 309ptcwakeup(tp, flag) 310 struct tty *tp; 311 int flag; 312{ 313 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 314 315 if (flag & FREAD) { 316 selwakeup(&pti->pt_selr); 317 wakeup(TSA_PTC_READ(tp)); 318 } 319 if (flag & FWRITE) { 320 selwakeup(&pti->pt_selw); 321 wakeup(TSA_PTC_WRITE(tp)); 322 } 323} 324 325static int 326ptcopen(dev, flag, devtype, p) 327 dev_t dev; 328 int flag, devtype; 329 struct proc *p; 330{ 331 register struct tty *tp; 332 struct pt_ioctl *pti; 333 334 if (minor(dev) >= npty) 335 return (ENXIO); 336 tp = &pt_tty[minor(dev)]; 337 if (tp->t_oproc) 338 return (EIO); 339 tp->t_oproc = ptsstart; 340#ifdef sun4c 341 tp->t_stop = ptsstop; 342#endif 343 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 344 tp->t_lflag &= ~EXTPROC; 345 pti = &pt_ioctl[minor(dev)]; 346 pti->pt_flags = 0; 347 pti->pt_send = 0; 348 pti->pt_ucntl = 0; 349 return (0); 350} 351 352static int 353ptcclose(dev, flags, fmt, p) 354 dev_t dev; 355 int flags; 356 int fmt; 357 struct proc *p; 358{ 359 register struct tty *tp; 360 361 tp = &pt_tty[minor(dev)]; 362 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 363 364 /* 365 * XXX MDMBUF makes no sense for ptys but would inhibit the above 366 * l_modem(). CLOCAL makes sense but isn't supported. Special 367 * l_modem()s that ignore carrier drop make no sense for ptys but 368 * may be in use because other parts of the line discipline make 369 * sense for ptys. Recover by doing everything that a normal 370 * ttymodem() would have done except for sending a SIGHUP. 371 */ 372 if (tp->t_state & TS_ISOPEN) { 373 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 374 tp->t_state |= TS_ZOMBIE; 375 ttyflush(tp, FREAD | FWRITE); 376 } 377 378 tp->t_oproc = 0; /* mark closed */ 379 return (0); 380} 381 382static int 383ptcread(dev, uio, flag) 384 dev_t dev; 385 struct uio *uio; 386 int flag; 387{ 388 register struct tty *tp = &pt_tty[minor(dev)]; 389 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 390 char buf[BUFSIZ]; 391 int error = 0, cc; 392 393 /* 394 * We want to block until the slave 395 * is open, and there's something to read; 396 * but if we lost the slave or we're NBIO, 397 * then return the appropriate error instead. 398 */ 399 for (;;) { 400 if (tp->t_state&TS_ISOPEN) { 401 if (pti->pt_flags&PF_PKT && pti->pt_send) { 402 error = ureadc((int)pti->pt_send, uio); 403 if (error) 404 return (error); 405 if (pti->pt_send & TIOCPKT_IOCTL) { 406 cc = min(uio->uio_resid, 407 sizeof(tp->t_termios)); 408 uiomove((caddr_t)&tp->t_termios, cc, 409 uio); 410 } 411 pti->pt_send = 0; 412 return (0); 413 } 414 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 415 error = ureadc((int)pti->pt_ucntl, uio); 416 if (error) 417 return (error); 418 pti->pt_ucntl = 0; 419 return (0); 420 } 421 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 422 break; 423 } 424 if ((tp->t_state & TS_CONNECTED) == 0) 425 return (0); /* EOF */ 426 if (flag & IO_NDELAY) 427 return (EWOULDBLOCK); 428 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 429 if (error) 430 return (error); 431 } 432 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 433 error = ureadc(0, uio); 434 while (uio->uio_resid > 0 && error == 0) { 435 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 436 if (cc <= 0) 437 break; 438 error = uiomove(buf, cc, uio); 439 } 440 ttwwakeup(tp); 441 return (error); 442} 443 444static void 445ptsstop(tp, flush) 446 register struct tty *tp; 447 int flush; 448{ 449 struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 450 int flag; 451 452 /* note: FLUSHREAD and FLUSHWRITE already ok */ 453 if (flush == 0) { 454 flush = TIOCPKT_STOP; 455 pti->pt_flags |= PF_STOPPED; 456 } else 457 pti->pt_flags &= ~PF_STOPPED; 458 pti->pt_send |= flush; 459 /* change of perspective */ 460 flag = 0; 461 if (flush & FREAD) 462 flag |= FWRITE; 463 if (flush & FWRITE) 464 flag |= FREAD; 465 ptcwakeup(tp, flag); 466} 467 468static int 469ptcpoll(dev, events, p) 470 dev_t dev; 471 int events; 472 struct proc *p; 473{ 474 register struct tty *tp = &pt_tty[minor(dev)]; 475 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 476 int revents = 0; 477 int s; 478 479 if ((tp->t_state & TS_CONNECTED) == 0) 480 return (seltrue(dev, events, p) | POLLHUP); 481 482 /* 483 * Need to block timeouts (ttrstart). 484 */ 485 s = spltty(); 486 487 if (events & (POLLIN | POLLRDNORM)) 488 if ((tp->t_state & TS_ISOPEN) && 489 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || 490 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 491 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 492 revents |= events & (POLLIN | POLLRDNORM); 493 494 if (events & (POLLOUT | POLLWRNORM)) 495 if (tp->t_state & TS_ISOPEN && 496 ((pti->pt_flags & PF_REMOTE) ? 497 (tp->t_canq.c_cc == 0) : 498 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 499 (tp->t_canq.c_cc == 0 && (tp->t_iflag & ICANON))))) 500 revents |= events & (POLLOUT | POLLWRNORM); 501 502 if (events & POLLHUP) 503 if ((tp->t_state & TS_CARR_ON) == 0) 504 revents |= POLLHUP; 505 506 if (revents == 0) { 507 if (events & (POLLIN | POLLRDNORM)) 508 selrecord(p, &pti->pt_selr); 509 510 if (events & (POLLOUT | POLLWRNORM)) 511 selrecord(p, &pti->pt_selw); 512 } 513 splx(s); 514 515 return (revents); 516} 517 518static int 519ptcwrite(dev, uio, flag) 520 dev_t dev; 521 register struct uio *uio; 522 int flag; 523{ 524 register struct tty *tp = &pt_tty[minor(dev)]; 525 register u_char *cp = 0; 526 register int cc = 0; 527 u_char locbuf[BUFSIZ]; 528 int cnt = 0; 529 struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 530 int error = 0; 531 532again: 533 if ((tp->t_state&TS_ISOPEN) == 0) 534 goto block; 535 if (pti->pt_flags & PF_REMOTE) { 536 if (tp->t_canq.c_cc) 537 goto block; 538 while ((uio->uio_resid > 0 || cc > 0) && 539 tp->t_canq.c_cc < TTYHOG - 1) { 540 if (cc == 0) { 541 cc = min(uio->uio_resid, BUFSIZ); 542 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 543 cp = locbuf; 544 error = uiomove((caddr_t)cp, cc, uio); 545 if (error) 546 return (error); 547 /* check again for safety */ 548 if ((tp->t_state & TS_ISOPEN) == 0) { 549 /* adjust as usual */ 550 uio->uio_resid += cc; 551 return (EIO); 552 } 553 } 554 if (cc > 0) { 555 cc = b_to_q((char *)cp, cc, &tp->t_canq); 556 /* 557 * XXX we don't guarantee that the canq size 558 * is >= TTYHOG, so the above b_to_q() may 559 * leave some bytes uncopied. However, space 560 * is guaranteed for the null terminator if 561 * we don't fail here since (TTYHOG - 1) is 562 * not a multiple of CBSIZE. 563 */ 564 if (cc > 0) 565 break; 566 } 567 } 568 /* adjust for data copied in but not written */ 569 uio->uio_resid += cc; 570 (void) putc(0, &tp->t_canq); 571 ttwakeup(tp); 572 wakeup(TSA_PTS_READ(tp)); 573 return (0); 574 } 575 while (uio->uio_resid > 0 || cc > 0) { 576 if (cc == 0) { 577 cc = min(uio->uio_resid, BUFSIZ); 578 cp = locbuf; 579 error = uiomove((caddr_t)cp, cc, uio); 580 if (error) 581 return (error); 582 /* check again for safety */ 583 if ((tp->t_state & TS_ISOPEN) == 0) { 584 /* adjust for data copied in but not written */ 585 uio->uio_resid += cc; 586 return (EIO); 587 } 588 } 589 while (cc > 0) { 590 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 591 (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 592 wakeup(TSA_HUP_OR_INPUT(tp)); 593 goto block; 594 } 595 (*linesw[tp->t_line].l_rint)(*cp++, tp); 596 cnt++; 597 cc--; 598 } 599 cc = 0; 600 } 601 return (0); 602block: 603 /* 604 * Come here to wait for slave to open, for space 605 * in outq, or space in rawq, or an empty canq. 606 */ 607 if ((tp->t_state & TS_CONNECTED) == 0) { 608 /* adjust for data copied in but not written */ 609 uio->uio_resid += cc; 610 return (EIO); 611 } 612 if (flag & IO_NDELAY) { 613 /* adjust for data copied in but not written */ 614 uio->uio_resid += cc; 615 if (cnt == 0) 616 return (EWOULDBLOCK); 617 return (0); 618 } 619 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); 620 if (error) { 621 /* adjust for data copied in but not written */ 622 uio->uio_resid += cc; 623 return (error); 624 } 625 goto again; 626} 627 628static struct tty * 629ptydevtotty(dev) 630 dev_t dev; 631{ 632 if (minor(dev) >= npty) 633 return (NULL); 634 635 return &pt_tty[minor(dev)]; 636} 637 638/*ARGSUSED*/ 639static int 640ptyioctl(dev, cmd, data, flag, p) 641 dev_t dev; 642 u_long cmd; 643 caddr_t data; 644 int flag; 645 struct proc *p; 646{ 647 register struct tty *tp = &pt_tty[minor(dev)]; 648 register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 649 register u_char *cc = tp->t_cc; 650 int stop, error; 651 652 if (devsw(dev)->d_open == ptcopen) { 653 switch (cmd) { 654 655 case TIOCGPGRP: 656 /* 657 * We avoid calling ttioctl on the controller since, 658 * in that case, tp must be the controlling terminal. 659 */ 660 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 661 return (0); 662 663 case TIOCPKT: 664 if (*(int *)data) { 665 if (pti->pt_flags & PF_UCNTL) 666 return (EINVAL); 667 pti->pt_flags |= PF_PKT; 668 } else 669 pti->pt_flags &= ~PF_PKT; 670 return (0); 671 672 case TIOCUCNTL: 673 if (*(int *)data) { 674 if (pti->pt_flags & PF_PKT) 675 return (EINVAL); 676 pti->pt_flags |= PF_UCNTL; 677 } else 678 pti->pt_flags &= ~PF_UCNTL; 679 return (0); 680 681 case TIOCREMOTE: 682 if (*(int *)data) 683 pti->pt_flags |= PF_REMOTE; 684 else 685 pti->pt_flags &= ~PF_REMOTE; 686 ttyflush(tp, FREAD|FWRITE); 687 return (0); 688 } 689 690 /* 691 * The rest of the ioctls shouldn't be called until 692 * the slave is open. 693 */ 694 if ((tp->t_state & TS_ISOPEN) == 0) 695 return (EAGAIN); 696 697 switch (cmd) { 698#ifdef COMPAT_43 699 case TIOCSETP: 700 case TIOCSETN: 701#endif 702 case TIOCSETD: 703 case TIOCSETA: 704 case TIOCSETAW: 705 case TIOCSETAF: 706 /* 707 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 708 * ttywflush(tp) will hang if there are characters in 709 * the outq. 710 */ 711 ndflush(&tp->t_outq, tp->t_outq.c_cc); 712 break; 713 714 case TIOCSIG: 715 if (*(unsigned int *)data >= NSIG || 716 *(unsigned int *)data == 0) 717 return(EINVAL); 718 if ((tp->t_lflag&NOFLSH) == 0) 719 ttyflush(tp, FREAD|FWRITE); 720 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 721 if ((*(unsigned int *)data == SIGINFO) && 722 ((tp->t_lflag&NOKERNINFO) == 0)) 723 ttyinfo(tp); 724 return(0); 725 } 726 } 727 if (cmd == TIOCEXT) { 728 /* 729 * When the EXTPROC bit is being toggled, we need 730 * to send an TIOCPKT_IOCTL if the packet driver 731 * is turned on. 732 */ 733 if (*(int *)data) { 734 if (pti->pt_flags & PF_PKT) { 735 pti->pt_send |= TIOCPKT_IOCTL; 736 ptcwakeup(tp, FREAD); 737 } 738 tp->t_lflag |= EXTPROC; 739 } else { 740 if ((tp->t_lflag & EXTPROC) && 741 (pti->pt_flags & PF_PKT)) { 742 pti->pt_send |= TIOCPKT_IOCTL; 743 ptcwakeup(tp, FREAD); 744 } 745 tp->t_lflag &= ~EXTPROC; 746 } 747 return(0); 748 } 749 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 750 if (error == ENOIOCTL) 751 error = ttioctl(tp, cmd, data, flag); 752 if (error == ENOIOCTL) { 753 if (pti->pt_flags & PF_UCNTL && 754 (cmd & ~0xff) == UIOCCMD(0)) { 755 if (cmd & 0xff) { 756 pti->pt_ucntl = (u_char)cmd; 757 ptcwakeup(tp, FREAD); 758 } 759 return (0); 760 } 761 error = ENOTTY; 762 } 763 /* 764 * If external processing and packet mode send ioctl packet. 765 */ 766 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 767 switch(cmd) { 768 case TIOCSETA: 769 case TIOCSETAW: 770 case TIOCSETAF: 771#ifdef COMPAT_43 772 case TIOCSETP: 773 case TIOCSETN: 774#endif 775#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 776 case TIOCSETC: 777 case TIOCSLTC: 778 case TIOCLBIS: 779 case TIOCLBIC: 780 case TIOCLSET: 781#endif 782 pti->pt_send |= TIOCPKT_IOCTL; 783 ptcwakeup(tp, FREAD); 784 default: 785 break; 786 } 787 } 788 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 789 && CCEQ(cc[VSTART], CTRL('q')); 790 if (pti->pt_flags & PF_NOSTOP) { 791 if (stop) { 792 pti->pt_send &= ~TIOCPKT_NOSTOP; 793 pti->pt_send |= TIOCPKT_DOSTOP; 794 pti->pt_flags &= ~PF_NOSTOP; 795 ptcwakeup(tp, FREAD); 796 } 797 } else { 798 if (!stop) { 799 pti->pt_send &= ~TIOCPKT_DOSTOP; 800 pti->pt_send |= TIOCPKT_NOSTOP; 801 pti->pt_flags |= PF_NOSTOP; 802 ptcwakeup(tp, FREAD); 803 } 804 } 805 return (error); 806} 807 808static int ptc_devsw_installed; 809 810static void ptc_drvinit __P((void *unused)); 811static void 812ptc_drvinit(unused) 813 void *unused; 814{ 815#ifdef DEVFS 816 int i,j,k; 817#endif 818 dev_t dev; 819 820 if( ! ptc_devsw_installed ) { 821 dev = makedev(CDEV_MAJOR_S, 0); 822 cdevsw_add(&dev, &pts_cdevsw, NULL); 823 dev = makedev(CDEV_MAJOR_C, 0); 824 cdevsw_add(&dev, &ptc_cdevsw, NULL); 825 ptc_devsw_installed = 1; 826#ifdef DEVFS 827 for ( i = 0 ; i<NPTY ; i++ ) { 828 j = i / 32; 829 k = i % 32; 830 devfs_token_pts[i] = 831 devfs_add_devswf(&pts_cdevsw,i, 832 DV_CHR,0,0,0666, 833 "tty%c%r",jnames[j],k); 834 devfs_token_ptc[i] = 835 devfs_add_devswf(&ptc_cdevsw,i, 836 DV_CHR,0,0,0666, 837 "pty%c%r",jnames[j],k); 838 } 839#endif 840 } 841} 842 843SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL) 844