pty.c revision 111815
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 111815 2003-03-03 12:15:54Z phk $ 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 .d_open = ptsopen, 81 .d_close = ptsclose, 82 .d_read = ptsread, 83 .d_write = ptswrite, 84 .d_ioctl = ptyioctl, 85 .d_poll = ttypoll, 86 .d_name = "pts", 87 .d_maj = CDEV_MAJOR_S, 88 .d_flags = D_TTY | D_KQFILTER, 89 .d_kqfilter = ttykqfilter, 90}; 91 92#define CDEV_MAJOR_C 6 93static struct cdevsw ptc_cdevsw = { 94 .d_open = ptcopen, 95 .d_close = ptcclose, 96 .d_read = ptcread, 97 .d_write = ptcwrite, 98 .d_ioctl = ptyioctl, 99 .d_poll = ptcpoll, 100 .d_name = "ptc", 101 .d_maj = CDEV_MAJOR_C, 102 .d_flags = D_TTY | D_KQFILTER, 103 .d_kqfilter = ttykqfilter, 104}; 105 106#define BUFSIZ 100 /* Chunk size iomoved to/from user */ 107 108struct pt_ioctl { 109 int pt_flags; 110 struct selinfo pt_selr, pt_selw; 111 u_char pt_send; 112 u_char pt_ucntl; 113 struct tty pt_tty; 114 dev_t devs, devc; 115 struct prison *pt_prison; 116}; 117 118#define PF_PKT 0x08 /* packet mode */ 119#define PF_STOPPED 0x10 /* user told stopped */ 120#define PF_REMOTE 0x20 /* remote and flow controlled input */ 121#define PF_NOSTOP 0x40 122#define PF_UCNTL 0x80 /* user control mode */ 123 124static char *names = "pqrsPQRS"; 125/* 126 * This function creates and initializes a pts/ptc pair 127 * 128 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 129 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 130 * 131 * XXX: define and add mapping of upper minor bits to allow more 132 * than 256 ptys. 133 */ 134static dev_t 135ptyinit(dev_t devc) 136{ 137 dev_t devs; 138 struct pt_ioctl *pt; 139 int n; 140 141 n = minor(devc); 142 /* For now we only map the lower 8 bits of the minor */ 143 if (n & ~0xff) 144 return (NODEV); 145 146 devc->si_flags &= ~SI_CHEAPCLONE; 147 148 pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO); 149 pt->devs = devs = make_dev(&pts_cdevsw, n, 150 UID_ROOT, GID_WHEEL, 0666, "tty%c%r", names[n / 32], n % 32); 151 pt->devc = devc; 152 153 devs->si_drv1 = devc->si_drv1 = pt; 154 devs->si_tty = devc->si_tty = &pt->pt_tty; 155 pt->pt_tty.t_dev = devs; 156 ttyregister(&pt->pt_tty); 157 return (devc); 158} 159 160/*ARGSUSED*/ 161static int 162ptsopen(dev, flag, devtype, td) 163 dev_t dev; 164 int flag, devtype; 165 struct thread *td; 166{ 167 struct tty *tp; 168 int error; 169 struct pt_ioctl *pti; 170 171 if (!dev->si_drv1) 172 return(ENXIO); 173 pti = dev->si_drv1; 174 tp = dev->si_tty; 175 if ((tp->t_state & TS_ISOPEN) == 0) { 176 ttychars(tp); /* Set up default chars */ 177 tp->t_iflag = TTYDEF_IFLAG; 178 tp->t_oflag = TTYDEF_OFLAG; 179 tp->t_lflag = TTYDEF_LFLAG; 180 tp->t_cflag = TTYDEF_CFLAG; 181 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 182 } else if (tp->t_state & TS_XCLUDE && suser(td)) { 183 return (EBUSY); 184 } else if (pti->pt_prison != td->td_ucred->cr_prison) { 185 return (EBUSY); 186 } 187 if (tp->t_oproc) /* Ctrlr still around. */ 188 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 189 while ((tp->t_state & TS_CARR_ON) == 0) { 190 if (flag&FNONBLOCK) 191 break; 192 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 193 "ptsopn", 0); 194 if (error) 195 return (error); 196 } 197 error = (*linesw[tp->t_line].l_open)(dev, tp); 198 if (error == 0) 199 ptcwakeup(tp, FREAD|FWRITE); 200 return (error); 201} 202 203static int 204ptsclose(dev, flag, mode, td) 205 dev_t dev; 206 int flag, mode; 207 struct thread *td; 208{ 209 struct tty *tp; 210 int err; 211 212 tp = dev->si_tty; 213 err = (*linesw[tp->t_line].l_close)(tp, flag); 214 ptsstop(tp, FREAD|FWRITE); 215 (void) ttyclose(tp); 216 return (err); 217} 218 219static int 220ptsread(dev, uio, flag) 221 dev_t dev; 222 struct uio *uio; 223 int flag; 224{ 225 struct thread *td = curthread; 226 struct proc *p = td->td_proc; 227 struct tty *tp = dev->si_tty; 228 struct pt_ioctl *pti = dev->si_drv1; 229 struct pgrp *pg; 230 int error = 0; 231 232again: 233 if (pti->pt_flags & PF_REMOTE) { 234 while (isbackground(p, tp)) { 235 sx_slock(&proctree_lock); 236 PROC_LOCK(p); 237 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) || 238 SIGISMEMBER(p->p_sigmask, SIGTTIN) || 239 p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) { 240 PROC_UNLOCK(p); 241 sx_sunlock(&proctree_lock); 242 return (EIO); 243 } 244 pg = p->p_pgrp; 245 PROC_UNLOCK(p); 246 PGRP_LOCK(pg); 247 sx_sunlock(&proctree_lock); 248 pgsignal(pg, SIGTTIN, 1); 249 PGRP_UNLOCK(pg); 250 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg", 251 0); 252 if (error) 253 return (error); 254 } 255 if (tp->t_canq.c_cc == 0) { 256 if (flag & IO_NDELAY) 257 return (EWOULDBLOCK); 258 error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, 259 "ptsin", 0); 260 if (error) 261 return (error); 262 goto again; 263 } 264 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 265 if (ureadc(getc(&tp->t_canq), uio) < 0) { 266 error = EFAULT; 267 break; 268 } 269 if (tp->t_canq.c_cc == 1) 270 (void) getc(&tp->t_canq); 271 if (tp->t_canq.c_cc) 272 return (error); 273 } else 274 if (tp->t_oproc) 275 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 276 ptcwakeup(tp, FWRITE); 277 return (error); 278} 279 280/* 281 * Write to pseudo-tty. 282 * Wakeups of controlling tty will happen 283 * indirectly, when tty driver calls ptsstart. 284 */ 285static int 286ptswrite(dev, uio, flag) 287 dev_t dev; 288 struct uio *uio; 289 int flag; 290{ 291 struct tty *tp; 292 293 tp = dev->si_tty; 294 if (tp->t_oproc == 0) 295 return (EIO); 296 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 297} 298 299/* 300 * Start output on pseudo-tty. 301 * Wake up process selecting or sleeping for input from controlling tty. 302 */ 303static void 304ptsstart(tp) 305 struct tty *tp; 306{ 307 struct pt_ioctl *pti = tp->t_dev->si_drv1; 308 309 if (tp->t_state & TS_TTSTOP) 310 return; 311 if (pti->pt_flags & PF_STOPPED) { 312 pti->pt_flags &= ~PF_STOPPED; 313 pti->pt_send = TIOCPKT_START; 314 } 315 ptcwakeup(tp, FREAD); 316} 317 318static void 319ptcwakeup(tp, flag) 320 struct tty *tp; 321 int flag; 322{ 323 struct pt_ioctl *pti = tp->t_dev->si_drv1; 324 325 if (flag & FREAD) { 326 selwakeup(&pti->pt_selr); 327 wakeup(TSA_PTC_READ(tp)); 328 } 329 if (flag & FWRITE) { 330 selwakeup(&pti->pt_selw); 331 wakeup(TSA_PTC_WRITE(tp)); 332 } 333} 334 335static int 336ptcopen(dev, flag, devtype, td) 337 dev_t dev; 338 int flag, devtype; 339 struct thread *td; 340{ 341 struct tty *tp; 342 struct pt_ioctl *pti; 343 344 if (!dev->si_drv1) 345 ptyinit(dev); 346 if (!dev->si_drv1) 347 return(ENXIO); 348 tp = dev->si_tty; 349 if (tp->t_oproc) 350 return (EIO); 351 tp->t_timeout = -1; 352 tp->t_oproc = ptsstart; 353 tp->t_stop = ptsstop; 354 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 355 tp->t_lflag &= ~EXTPROC; 356 pti = dev->si_drv1; 357 pti->pt_prison = td->td_ucred->cr_prison; 358 pti->pt_flags = 0; 359 pti->pt_send = 0; 360 pti->pt_ucntl = 0; 361 return (0); 362} 363 364static int 365ptcclose(dev, flags, fmt, td) 366 dev_t dev; 367 int flags; 368 int fmt; 369 struct thread *td; 370{ 371 struct tty *tp; 372 373 tp = dev->si_tty; 374 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 375 376 /* 377 * XXX MDMBUF makes no sense for ptys but would inhibit the above 378 * l_modem(). CLOCAL makes sense but isn't supported. Special 379 * l_modem()s that ignore carrier drop make no sense for ptys but 380 * may be in use because other parts of the line discipline make 381 * sense for ptys. Recover by doing everything that a normal 382 * ttymodem() would have done except for sending a SIGHUP. 383 */ 384 if (tp->t_state & TS_ISOPEN) { 385 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 386 tp->t_state |= TS_ZOMBIE; 387 ttyflush(tp, FREAD | FWRITE); 388 } 389 390 tp->t_oproc = 0; /* mark closed */ 391 return (0); 392} 393 394static int 395ptcread(dev, uio, flag) 396 dev_t dev; 397 struct uio *uio; 398 int flag; 399{ 400 struct tty *tp = dev->si_tty; 401 struct pt_ioctl *pti = dev->si_drv1; 402 char buf[BUFSIZ]; 403 int error = 0, cc; 404 405 /* 406 * We want to block until the slave 407 * is open, and there's something to read; 408 * but if we lost the slave or we're NBIO, 409 * then return the appropriate error instead. 410 */ 411 for (;;) { 412 if (tp->t_state&TS_ISOPEN) { 413 if (pti->pt_flags&PF_PKT && pti->pt_send) { 414 error = ureadc((int)pti->pt_send, uio); 415 if (error) 416 return (error); 417 if (pti->pt_send & TIOCPKT_IOCTL) { 418 cc = min(uio->uio_resid, 419 sizeof(tp->t_termios)); 420 uiomove(&tp->t_termios, cc, uio); 421 } 422 pti->pt_send = 0; 423 return (0); 424 } 425 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 426 error = ureadc((int)pti->pt_ucntl, uio); 427 if (error) 428 return (error); 429 pti->pt_ucntl = 0; 430 return (0); 431 } 432 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 433 break; 434 } 435 if ((tp->t_state & TS_CONNECTED) == 0) 436 return (0); /* EOF */ 437 if (flag & IO_NDELAY) 438 return (EWOULDBLOCK); 439 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 440 if (error) 441 return (error); 442 } 443 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 444 error = ureadc(0, uio); 445 while (uio->uio_resid > 0 && error == 0) { 446 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 447 if (cc <= 0) 448 break; 449 error = uiomove(buf, cc, uio); 450 } 451 ttwwakeup(tp); 452 return (error); 453} 454 455static void 456ptsstop(tp, flush) 457 struct tty *tp; 458 int flush; 459{ 460 struct pt_ioctl *pti = tp->t_dev->si_drv1; 461 int flag; 462 463 /* note: FLUSHREAD and FLUSHWRITE already ok */ 464 if (flush == 0) { 465 flush = TIOCPKT_STOP; 466 pti->pt_flags |= PF_STOPPED; 467 } else 468 pti->pt_flags &= ~PF_STOPPED; 469 pti->pt_send |= flush; 470 /* change of perspective */ 471 flag = 0; 472 if (flush & FREAD) 473 flag |= FWRITE; 474 if (flush & FWRITE) 475 flag |= FREAD; 476 ptcwakeup(tp, flag); 477} 478 479static int 480ptcpoll(dev, events, td) 481 dev_t dev; 482 int events; 483 struct thread *td; 484{ 485 struct tty *tp = dev->si_tty; 486 struct pt_ioctl *pti = dev->si_drv1; 487 int revents = 0; 488 int s; 489 490 if ((tp->t_state & TS_CONNECTED) == 0) 491 return (seltrue(dev, events, td) | POLLHUP); 492 493 /* 494 * Need to block timeouts (ttrstart). 495 */ 496 s = spltty(); 497 498 if (events & (POLLIN | POLLRDNORM)) 499 if ((tp->t_state & TS_ISOPEN) && 500 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || 501 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 502 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 503 revents |= events & (POLLIN | POLLRDNORM); 504 505 if (events & (POLLOUT | POLLWRNORM)) 506 if (tp->t_state & TS_ISOPEN && 507 ((pti->pt_flags & PF_REMOTE) ? 508 (tp->t_canq.c_cc == 0) : 509 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 510 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) 511 revents |= events & (POLLOUT | POLLWRNORM); 512 513 if (events & POLLHUP) 514 if ((tp->t_state & TS_CARR_ON) == 0) 515 revents |= POLLHUP; 516 517 if (revents == 0) { 518 if (events & (POLLIN | POLLRDNORM)) 519 selrecord(td, &pti->pt_selr); 520 521 if (events & (POLLOUT | POLLWRNORM)) 522 selrecord(td, &pti->pt_selw); 523 } 524 splx(s); 525 526 return (revents); 527} 528 529static int 530ptcwrite(dev, uio, flag) 531 dev_t dev; 532 struct uio *uio; 533 int flag; 534{ 535 struct tty *tp = dev->si_tty; 536 u_char *cp = 0; 537 int cc = 0; 538 u_char locbuf[BUFSIZ]; 539 int cnt = 0; 540 struct pt_ioctl *pti = dev->si_drv1; 541 int error = 0; 542 543again: 544 if ((tp->t_state&TS_ISOPEN) == 0) 545 goto block; 546 if (pti->pt_flags & PF_REMOTE) { 547 if (tp->t_canq.c_cc) 548 goto block; 549 while ((uio->uio_resid > 0 || cc > 0) && 550 tp->t_canq.c_cc < TTYHOG - 1) { 551 if (cc == 0) { 552 cc = min(uio->uio_resid, BUFSIZ); 553 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 554 cp = locbuf; 555 error = uiomove(cp, cc, uio); 556 if (error) 557 return (error); 558 /* check again for safety */ 559 if ((tp->t_state & TS_ISOPEN) == 0) { 560 /* adjust as usual */ 561 uio->uio_resid += cc; 562 return (EIO); 563 } 564 } 565 if (cc > 0) { 566 cc = b_to_q((char *)cp, cc, &tp->t_canq); 567 /* 568 * XXX we don't guarantee that the canq size 569 * is >= TTYHOG, so the above b_to_q() may 570 * leave some bytes uncopied. However, space 571 * is guaranteed for the null terminator if 572 * we don't fail here since (TTYHOG - 1) is 573 * not a multiple of CBSIZE. 574 */ 575 if (cc > 0) 576 break; 577 } 578 } 579 /* adjust for data copied in but not written */ 580 uio->uio_resid += cc; 581 (void) putc(0, &tp->t_canq); 582 ttwakeup(tp); 583 wakeup(TSA_PTS_READ(tp)); 584 return (0); 585 } 586 while (uio->uio_resid > 0 || cc > 0) { 587 if (cc == 0) { 588 cc = min(uio->uio_resid, BUFSIZ); 589 cp = locbuf; 590 error = uiomove(cp, cc, uio); 591 if (error) 592 return (error); 593 /* check again for safety */ 594 if ((tp->t_state & TS_ISOPEN) == 0) { 595 /* adjust for data copied in but not written */ 596 uio->uio_resid += cc; 597 return (EIO); 598 } 599 } 600 while (cc > 0) { 601 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 602 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) { 603 wakeup(TSA_HUP_OR_INPUT(tp)); 604 goto block; 605 } 606 (*linesw[tp->t_line].l_rint)(*cp++, tp); 607 cnt++; 608 cc--; 609 } 610 cc = 0; 611 } 612 return (0); 613block: 614 /* 615 * Come here to wait for slave to open, for space 616 * in outq, or space in rawq, or an empty canq. 617 */ 618 if ((tp->t_state & TS_CONNECTED) == 0) { 619 /* adjust for data copied in but not written */ 620 uio->uio_resid += cc; 621 return (EIO); 622 } 623 if (flag & IO_NDELAY) { 624 /* adjust for data copied in but not written */ 625 uio->uio_resid += cc; 626 if (cnt == 0) 627 return (EWOULDBLOCK); 628 return (0); 629 } 630 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); 631 if (error) { 632 /* adjust for data copied in but not written */ 633 uio->uio_resid += cc; 634 return (error); 635 } 636 goto again; 637} 638 639/*ARGSUSED*/ 640static int 641ptyioctl(dev, cmd, data, flag, td) 642 dev_t dev; 643 u_long cmd; 644 caddr_t data; 645 int flag; 646 struct thread *td; 647{ 648 struct tty *tp = dev->si_tty; 649 struct pt_ioctl *pti = dev->si_drv1; 650 u_char *cc = tp->t_cc; 651 int stop, error; 652 653 if (devsw(dev)->d_open == ptcopen) { 654 switch (cmd) { 655 656 case TIOCGPGRP: 657 /* 658 * We avoid calling ttioctl on the controller since, 659 * in that case, tp must be the controlling terminal. 660 */ 661 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 662 return (0); 663 664 case TIOCPKT: 665 if (*(int *)data) { 666 if (pti->pt_flags & PF_UCNTL) 667 return (EINVAL); 668 pti->pt_flags |= PF_PKT; 669 } else 670 pti->pt_flags &= ~PF_PKT; 671 return (0); 672 673 case TIOCUCNTL: 674 if (*(int *)data) { 675 if (pti->pt_flags & PF_PKT) 676 return (EINVAL); 677 pti->pt_flags |= PF_UCNTL; 678 } else 679 pti->pt_flags &= ~PF_UCNTL; 680 return (0); 681 682 case TIOCREMOTE: 683 if (*(int *)data) 684 pti->pt_flags |= PF_REMOTE; 685 else 686 pti->pt_flags &= ~PF_REMOTE; 687 ttyflush(tp, FREAD|FWRITE); 688 return (0); 689 } 690 691 /* 692 * The rest of the ioctls shouldn't be called until 693 * the slave is open. 694 */ 695 if ((tp->t_state & TS_ISOPEN) == 0) 696 return (EAGAIN); 697 698 switch (cmd) { 699#ifdef COMPAT_43 700 case TIOCSETP: 701 case TIOCSETN: 702#endif 703 case TIOCSETD: 704 case TIOCSETA: 705 case TIOCSETAW: 706 case TIOCSETAF: 707 /* 708 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 709 * ttywflush(tp) will hang if there are characters in 710 * the outq. 711 */ 712 ndflush(&tp->t_outq, tp->t_outq.c_cc); 713 break; 714 715 case TIOCSIG: 716 if (*(unsigned int *)data >= NSIG || 717 *(unsigned int *)data == 0) 718 return(EINVAL); 719 if ((tp->t_lflag&NOFLSH) == 0) 720 ttyflush(tp, FREAD|FWRITE); 721 if (tp->t_pgrp != NULL) { 722 PGRP_LOCK(tp->t_pgrp); 723 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 724 PGRP_UNLOCK(tp->t_pgrp); 725 } 726 if ((*(unsigned int *)data == SIGINFO) && 727 ((tp->t_lflag&NOKERNINFO) == 0)) 728 ttyinfo(tp); 729 return(0); 730 } 731 } 732 if (cmd == TIOCEXT) { 733 /* 734 * When the EXTPROC bit is being toggled, we need 735 * to send an TIOCPKT_IOCTL if the packet driver 736 * is turned on. 737 */ 738 if (*(int *)data) { 739 if (pti->pt_flags & PF_PKT) { 740 pti->pt_send |= TIOCPKT_IOCTL; 741 ptcwakeup(tp, FREAD); 742 } 743 tp->t_lflag |= EXTPROC; 744 } else { 745 if ((tp->t_lflag & EXTPROC) && 746 (pti->pt_flags & PF_PKT)) { 747 pti->pt_send |= TIOCPKT_IOCTL; 748 ptcwakeup(tp, FREAD); 749 } 750 tp->t_lflag &= ~EXTPROC; 751 } 752 return(0); 753 } 754 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td); 755 if (error == ENOIOCTL) 756 error = ttioctl(tp, cmd, data, flag); 757 if (error == ENOIOCTL) { 758 if (pti->pt_flags & PF_UCNTL && 759 (cmd & ~0xff) == UIOCCMD(0)) { 760 if (cmd & 0xff) { 761 pti->pt_ucntl = (u_char)cmd; 762 ptcwakeup(tp, FREAD); 763 } 764 return (0); 765 } 766 error = ENOTTY; 767 } 768 /* 769 * If external processing and packet mode send ioctl packet. 770 */ 771 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 772 switch(cmd) { 773 case TIOCSETA: 774 case TIOCSETAW: 775 case TIOCSETAF: 776#ifdef COMPAT_43 777 case TIOCSETP: 778 case TIOCSETN: 779#endif 780#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 781 case TIOCSETC: 782 case TIOCSLTC: 783 case TIOCLBIS: 784 case TIOCLBIC: 785 case TIOCLSET: 786#endif 787 pti->pt_send |= TIOCPKT_IOCTL; 788 ptcwakeup(tp, FREAD); 789 default: 790 break; 791 } 792 } 793 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 794 && CCEQ(cc[VSTART], CTRL('q')); 795 if (pti->pt_flags & PF_NOSTOP) { 796 if (stop) { 797 pti->pt_send &= ~TIOCPKT_NOSTOP; 798 pti->pt_send |= TIOCPKT_DOSTOP; 799 pti->pt_flags &= ~PF_NOSTOP; 800 ptcwakeup(tp, FREAD); 801 } 802 } else { 803 if (!stop) { 804 pti->pt_send &= ~TIOCPKT_DOSTOP; 805 pti->pt_send |= TIOCPKT_NOSTOP; 806 pti->pt_flags |= PF_NOSTOP; 807 ptcwakeup(tp, FREAD); 808 } 809 } 810 return (error); 811} 812 813 814static void ptc_drvinit(void *unused); 815 816static void pty_clone(void *arg, char *name, int namelen, dev_t *dev); 817 818static void 819pty_clone(arg, name, namelen, dev) 820 void *arg; 821 char *name; 822 int namelen; 823 dev_t *dev; 824{ 825 int u; 826 827 if (*dev != NODEV) 828 return; 829 if (bcmp(name, "pty", 3) != 0) 830 return; 831 if (name[5] != '\0') 832 return; 833 switch (name[3]) { 834 case 'p': u = 0; break; 835 case 'q': u = 32; break; 836 case 'r': u = 64; break; 837 case 's': u = 96; break; 838 case 'P': u = 128; break; 839 case 'Q': u = 160; break; 840 case 'R': u = 192; break; 841 case 'S': u = 224; break; 842 default: return; 843 } 844 if (name[4] >= '0' && name[4] <= '9') 845 u += name[4] - '0'; 846 else if (name[4] >= 'a' && name[4] <= 'v') 847 u += name[4] - 'a' + 10; 848 else 849 return; 850 *dev = make_dev(&ptc_cdevsw, u, 851 UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32); 852 (*dev)->si_flags |= SI_CHEAPCLONE; 853 return; 854} 855 856static void 857ptc_drvinit(unused) 858 void *unused; 859{ 860 861 EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000); 862} 863 864SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL) 865