41/* Add bits to make Linux binaries work. */ 42#define PTS_LINUX 43 44#include <sys/param.h> 45#include <sys/lock.h> 46#include <sys/condvar.h> 47#include <sys/conf.h> 48#include <sys/fcntl.h> 49#include <sys/file.h> 50#include <sys/filedesc.h> 51#include <sys/filio.h> 52#include <sys/kernel.h> 53#include <sys/limits.h> 54#include <sys/malloc.h> 55#include <sys/poll.h> 56#include <sys/proc.h> 57#include <sys/resourcevar.h> 58#include <sys/serial.h> 59#include <sys/stat.h> 60#include <sys/syscall.h> 61#include <sys/syscallsubr.h> 62#include <sys/sysctl.h> 63#include <sys/sysent.h> 64#include <sys/sysproto.h> 65#include <sys/systm.h> 66#include <sys/tty.h> 67#include <sys/ttycom.h> 68 69#include <machine/stdarg.h> 70 71/* 72 * Our utmp(5) format is limited to 8-byte TTY line names. This means 73 * we can at most allocate 1000 pseudo-terminals ("pts/999"). Allow 74 * users to increase this number, assuming they have manually increased 75 * UT_LINESIZE. 76 */ 77static struct unrhdr *pts_pool; 78static unsigned int pts_maxdev = 999; 79SYSCTL_UINT(_kern, OID_AUTO, pts_maxdev, CTLFLAG_RW, &pts_maxdev, 0, 80 "Maximum amount of pts(4) pseudo-terminals"); 81 82static MALLOC_DEFINE(M_PTS, "pts", "pseudo tty device"); 83 84/* 85 * Per-PTS structure. 86 * 87 * List of locks 88 * (t) locked by tty_lock() 89 * (c) const until freeing 90 */ 91struct pts_softc { 92 int pts_unit; /* (c) Device unit number. */ 93 unsigned int pts_flags; /* (t) Device flags. */ 94#define PTS_PKT 0x1 /* Packet mode. */ 95#define PTS_FINISHED 0x2 /* Return errors on read()/write(). */ 96 char pts_pkt; /* (t) Unread packet mode data. */ 97 98 struct cv pts_inwait; /* (t) Blocking write() on master. */ 99 struct selinfo pts_inpoll; /* (t) Select queue for write(). */ 100 struct cv pts_outwait; /* (t) Blocking read() on master. */ 101 struct selinfo pts_outpoll; /* (t) Select queue for read(). */ 102 103#ifdef PTS_EXTERNAL 104 struct cdev *pts_cdev; /* (c) Master device node. */ 105#endif /* PTS_EXTERNAL */ 106 107 struct uidinfo *pts_uidinfo; /* (c) Resource limit. */ 108}; 109 110/* 111 * Controller-side file operations. 112 */ 113 114static int 115ptsdev_read(struct file *fp, struct uio *uio, struct ucred *active_cred, 116 int flags, struct thread *td) 117{ 118 struct tty *tp = fp->f_data; 119 struct pts_softc *psc = tty_softc(tp); 120 int error = 0; 121 char pkt; 122 123 if (uio->uio_resid == 0) 124 return (0); 125 126 tty_lock(tp); 127 128 for (;;) { 129 /* 130 * Implement packet mode. When packet mode is turned on, 131 * the first byte contains a bitmask of events that 132 * occured (start, stop, flush, window size, etc). 133 */ 134 if (psc->pts_flags & PTS_PKT && psc->pts_pkt) { 135 pkt = psc->pts_pkt; 136 psc->pts_pkt = 0; 137 tty_unlock(tp); 138 139 error = ureadc(pkt, uio); 140 return (error); 141 } 142 143 /* 144 * Transmit regular data. 145 * 146 * XXX: We shouldn't use ttydisc_getc_poll()! Even 147 * though in this implementation, there is likely going 148 * to be data, we should just call ttydisc_getc_uio() 149 * and use its return value to sleep. 150 */ 151 if (ttydisc_getc_poll(tp)) { 152 if (psc->pts_flags & PTS_PKT) { 153 /* 154 * XXX: Small race. Fortunately PTY 155 * consumers aren't multithreaded. 156 */ 157 158 tty_unlock(tp); 159 error = ureadc(TIOCPKT_DATA, uio); 160 if (error) 161 return (error); 162 tty_lock(tp); 163 } 164 165 error = ttydisc_getc_uio(tp, uio); 166 break; 167 } 168 169 /* Maybe the device isn't used anyway. */ 170 if (psc->pts_flags & PTS_FINISHED) 171 break; 172 173 /* Wait for more data. */ 174 if (fp->f_flag & O_NONBLOCK) { 175 error = EWOULDBLOCK; 176 break; 177 } 178 error = cv_wait_sig(&psc->pts_outwait, tp->t_mtx); 179 if (error != 0) 180 break; 181 } 182 183 tty_unlock(tp); 184 185 return (error); 186} 187 188static int 189ptsdev_write(struct file *fp, struct uio *uio, struct ucred *active_cred, 190 int flags, struct thread *td) 191{ 192 struct tty *tp = fp->f_data; 193 struct pts_softc *psc = tty_softc(tp); 194 char ib[256], *ibstart; 195 size_t iblen, rintlen; 196 int error = 0; 197 198 if (uio->uio_resid == 0) 199 return (0); 200 201 for (;;) { 202 ibstart = ib; 203 iblen = MIN(uio->uio_resid, sizeof ib); 204 error = uiomove(ib, iblen, uio); 205 206 tty_lock(tp); 207 if (error != 0) { 208 iblen = 0; 209 goto done; 210 } 211 212 /* 213 * When possible, avoid the slow path. rint_bypass() 214 * copies all input to the input queue at once. 215 */ 216 MPASS(iblen > 0); 217 do { 218 rintlen = ttydisc_rint_simple(tp, ibstart, iblen); 219 ibstart += rintlen; 220 iblen -= rintlen; 221 if (iblen == 0) { 222 /* All data written. */ 223 break; 224 } 225 226 /* Maybe the device isn't used anyway. */ 227 if (psc->pts_flags & PTS_FINISHED) { 228 error = EIO; 229 goto done; 230 } 231 232 /* Wait for more data. */ 233 if (fp->f_flag & O_NONBLOCK) { 234 error = EWOULDBLOCK; 235 goto done; 236 } 237 238 /* Wake up users on the slave side. */ 239 ttydisc_rint_done(tp); 240 error = cv_wait_sig(&psc->pts_inwait, tp->t_mtx); 241 if (error != 0) 242 goto done; 243 } while (iblen > 0); 244 245 if (uio->uio_resid == 0) 246 break; 247 tty_unlock(tp); 248 } 249 250done: ttydisc_rint_done(tp); 251 tty_unlock(tp); 252 253 /* 254 * Don't account for the part of the buffer that we couldn't 255 * pass to the TTY. 256 */ 257 uio->uio_resid += iblen; 258 return (error); 259} 260 261static int 262ptsdev_truncate(struct file *fp, off_t length, struct ucred *active_cred, 263 struct thread *td) 264{ 265 266 return (EINVAL); 267} 268 269static int 270ptsdev_ioctl(struct file *fp, u_long cmd, void *data, 271 struct ucred *active_cred, struct thread *td) 272{ 273 struct tty *tp = fp->f_data; 274 struct pts_softc *psc = tty_softc(tp); 275 int error = 0, sig; 276 277 switch (cmd) { 278 case FIONBIO: 279 /* This device supports non-blocking operation. */ 280 return (0); 281 case FIONREAD: 282 tty_lock(tp); 283 if (psc->pts_flags & PTS_FINISHED) { 284 /* Force read() to be called. */ 285 *(int *)data = 1; 286 } else { 287 *(int *)data = ttydisc_getc_poll(tp); 288 } 289 tty_unlock(tp); 290 return (0); 291 case FIODGNAME: { 292 struct fiodgname_arg *fgn; 293 const char *p; 294 int i; 295 296 /* Reverse device name lookups, for ptsname() and ttyname(). */ 297 fgn = data; 298 p = tty_devname(tp); 299 i = strlen(p) + 1; 300 if (i > fgn->len) 301 return (EINVAL); 302 return copyout(p, fgn->buf, i); 303 } 304 305 /* 306 * We need to implement TIOCGPGRP and TIOCGSID here again. When 307 * called on the pseudo-terminal master, it should not check if 308 * the terminal is the foreground terminal of the calling 309 * process. 310 * 311 * TIOCGETA is also implemented here. Various Linux PTY routines 312 * often call isatty(), which is implemented by tcgetattr(). 313 */ 314#ifdef PTS_LINUX 315 case TIOCGETA: 316 /* Obtain terminal flags through tcgetattr(). */ 317 tty_lock(tp); 318 *(struct termios*)data = tp->t_termios; 319 tty_unlock(tp); 320 return (0); 321#endif /* PTS_LINUX */ 322 case TIOCSETAF: 323 case TIOCSETAW: 324 /* 325 * We must make sure we turn tcsetattr() calls of TCSAFLUSH and 326 * TCSADRAIN into something different. If an application would 327 * call TCSAFLUSH or TCSADRAIN on the master descriptor, it may 328 * deadlock waiting for all data to be read. 329 */ 330 cmd = TIOCSETA; 331 break; 332#if defined(PTS_COMPAT) || defined(PTS_LINUX) 333 case TIOCGPTN: 334 /* 335 * Get the device unit number. 336 */ 337 if (psc->pts_unit < 0) 338 return (ENOTTY); 339 *(unsigned int *)data = psc->pts_unit; 340 return (0); 341#endif /* PTS_COMPAT || PTS_LINUX */ 342 case TIOCGPGRP: 343 /* Get the foreground process group ID. */ 344 tty_lock(tp); 345 if (tp->t_pgrp != NULL) 346 *(int *)data = tp->t_pgrp->pg_id; 347 else 348 *(int *)data = NO_PID; 349 tty_unlock(tp); 350 return (0); 351 case TIOCGSID: 352 /* Get the session leader process ID. */ 353 tty_lock(tp); 354 if (tp->t_session == NULL) 355 error = ENOTTY; 356 else 357 *(int *)data = tp->t_session->s_sid; 358 tty_unlock(tp); 359 return (error); 360 case TIOCPTMASTER: 361 /* Yes, we are a pseudo-terminal master. */ 362 return (0); 363 case TIOCSIG: 364 /* Signal the foreground process group. */ 365 sig = *(int *)data; 366 if (sig < 1 || sig >= NSIG) 367 return (EINVAL); 368 369 tty_lock(tp); 370 tty_signal_pgrp(tp, sig); 371 tty_unlock(tp); 372 return (0); 373 case TIOCPKT: 374 /* Enable/disable packet mode. */ 375 tty_lock(tp); 376 if (*(int *)data) 377 psc->pts_flags |= PTS_PKT; 378 else 379 psc->pts_flags &= ~PTS_PKT; 380 tty_unlock(tp); 381 return (0); 382 } 383 384 /* Just redirect this ioctl to the slave device. */ 385 tty_lock(tp); 386 error = tty_ioctl(tp, cmd, data, td); 387 tty_unlock(tp); 388 if (error == ENOIOCTL) 389 error = ENOTTY; 390 391 return (error); 392} 393 394static int 395ptsdev_poll(struct file *fp, int events, struct ucred *active_cred, 396 struct thread *td) 397{ 398 struct tty *tp = fp->f_data; 399 struct pts_softc *psc = tty_softc(tp); 400 int revents = 0; 401 402 tty_lock(tp); 403 404 if (psc->pts_flags & PTS_FINISHED) { 405 /* Slave device is not opened. */ 406 tty_unlock(tp); 407 return ((events & (POLLIN|POLLRDNORM)) | POLLHUP); 408 } 409 410 if (events & (POLLIN|POLLRDNORM)) { 411 /* See if we can getc something. */ 412 if (ttydisc_getc_poll(tp) || 413 (psc->pts_flags & PTS_PKT && psc->pts_pkt)) 414 revents |= events & (POLLIN|POLLRDNORM); 415 } 416 if (events & (POLLOUT|POLLWRNORM)) { 417 /* See if we can rint something. */ 418 if (ttydisc_rint_poll(tp)) 419 revents |= events & (POLLOUT|POLLWRNORM); 420 } 421 422 /* 423 * No need to check for POLLHUP here. This device cannot be used 424 * as a callout device, which means we always have a carrier, 425 * because the master is. 426 */ 427 428 if (revents == 0) { 429 /* 430 * This code might look misleading, but the naming of 431 * poll events on this side is the opposite of the slave 432 * device. 433 */ 434 if (events & (POLLIN|POLLRDNORM)) 435 selrecord(td, &psc->pts_outpoll); 436 if (events & (POLLOUT|POLLWRNORM)) 437 selrecord(td, &psc->pts_inpoll); 438 } 439 440 tty_unlock(tp); 441 442 return (revents); 443} 444 445/* 446 * kqueue support. 447 */ 448 449static void 450pts_kqops_read_detach(struct knote *kn) 451{ 452 struct file *fp = kn->kn_fp; 453 struct tty *tp = fp->f_data; 454 struct pts_softc *psc = tty_softc(tp); 455 456 knlist_remove(&psc->pts_outpoll.si_note, kn, 0); 457} 458 459static int 460pts_kqops_read_event(struct knote *kn, long hint) 461{ 462 struct file *fp = kn->kn_fp; 463 struct tty *tp = fp->f_data; 464 struct pts_softc *psc = tty_softc(tp); 465 466 if (psc->pts_flags & PTS_FINISHED) { 467 kn->kn_flags |= EV_EOF; 468 return (1); 469 } else { 470 kn->kn_data = ttydisc_getc_poll(tp); 471 return (kn->kn_data > 0); 472 } 473} 474 475static void 476pts_kqops_write_detach(struct knote *kn) 477{ 478 struct file *fp = kn->kn_fp; 479 struct tty *tp = fp->f_data; 480 struct pts_softc *psc = tty_softc(tp); 481 482 knlist_remove(&psc->pts_inpoll.si_note, kn, 0); 483} 484 485static int 486pts_kqops_write_event(struct knote *kn, long hint) 487{ 488 struct file *fp = kn->kn_fp; 489 struct tty *tp = fp->f_data; 490 struct pts_softc *psc = tty_softc(tp); 491 492 if (psc->pts_flags & PTS_FINISHED) { 493 kn->kn_flags |= EV_EOF; 494 return (1); 495 } else { 496 kn->kn_data = ttydisc_rint_poll(tp); 497 return (kn->kn_data > 0); 498 } 499} 500 501static struct filterops pts_kqops_read = 502 { 1, NULL, pts_kqops_read_detach, pts_kqops_read_event }; 503static struct filterops pts_kqops_write = 504 { 1, NULL, pts_kqops_write_detach, pts_kqops_write_event }; 505 506static int 507ptsdev_kqfilter(struct file *fp, struct knote *kn) 508{ 509 struct tty *tp = fp->f_data; 510 struct pts_softc *psc = tty_softc(tp); 511 int error = 0; 512 513 tty_lock(tp); 514 515 switch (kn->kn_filter) { 516 case EVFILT_READ: 517 kn->kn_fop = &pts_kqops_read; 518 knlist_add(&psc->pts_outpoll.si_note, kn, 1); 519 break; 520 case EVFILT_WRITE: 521 kn->kn_fop = &pts_kqops_write; 522 knlist_add(&psc->pts_inpoll.si_note, kn, 1); 523 break; 524 default: 525 error = EINVAL; 526 break; 527 } 528 529 tty_unlock(tp); 530 return (error); 531} 532 533static int 534ptsdev_stat(struct file *fp, struct stat *sb, struct ucred *active_cred, 535 struct thread *td) 536{ 537 struct tty *tp = fp->f_data; 538#ifdef PTS_EXTERNAL 539 struct pts_softc *psc = tty_softc(tp); 540#endif /* PTS_EXTERNAL */ 541 struct cdev *dev = tp->t_dev; 542 543 /* 544 * According to POSIX, we must implement an fstat(). This also 545 * makes this implementation compatible with Linux binaries, 546 * because Linux calls fstat() on the pseudo-terminal master to 547 * obtain st_rdev. 548 * 549 * XXX: POSIX also mentions we must fill in st_dev, but how? 550 */ 551 552 bzero(sb, sizeof *sb); 553#ifdef PTS_EXTERNAL 554 if (psc->pts_cdev != NULL) 555 sb->st_ino = sb->st_rdev = dev2udev(psc->pts_cdev); 556 else 557#endif /* PTS_EXTERNAL */ 558 sb->st_ino = sb->st_rdev = tty_udev(tp); 559 560 sb->st_atimespec = dev->si_atime; 561 sb->st_ctimespec = dev->si_ctime; 562 sb->st_mtimespec = dev->si_mtime; 563 sb->st_uid = dev->si_uid; 564 sb->st_gid = dev->si_gid; 565 sb->st_mode = dev->si_mode | S_IFCHR; 566 567 return (0); 568} 569 570static int 571ptsdev_close(struct file *fp, struct thread *td) 572{ 573 struct tty *tp = fp->f_data; 574 575 /* Deallocate TTY device. */ 576 tty_lock(tp); 577 tty_rel_gone(tp); 578 579 return (0); 580} 581 582static struct fileops ptsdev_ops = { 583 .fo_read = ptsdev_read, 584 .fo_write = ptsdev_write, 585 .fo_truncate = ptsdev_truncate, 586 .fo_ioctl = ptsdev_ioctl, 587 .fo_poll = ptsdev_poll, 588 .fo_kqfilter = ptsdev_kqfilter, 589 .fo_stat = ptsdev_stat, 590 .fo_close = ptsdev_close, 591 .fo_flags = DFLAG_PASSABLE, 592}; 593 594/* 595 * Driver-side hooks. 596 */ 597 598static void 599ptsdrv_outwakeup(struct tty *tp) 600{ 601 struct pts_softc *psc = tty_softc(tp); 602 603 cv_broadcast(&psc->pts_outwait); 604 selwakeup(&psc->pts_outpoll); 605 KNOTE_LOCKED(&psc->pts_outpoll.si_note, 0); 606} 607 608static void 609ptsdrv_inwakeup(struct tty *tp) 610{ 611 struct pts_softc *psc = tty_softc(tp); 612 613 cv_broadcast(&psc->pts_inwait); 614 selwakeup(&psc->pts_inpoll); 615 KNOTE_LOCKED(&psc->pts_inpoll.si_note, 0); 616} 617 618static int 619ptsdrv_open(struct tty *tp) 620{ 621 struct pts_softc *psc = tty_softc(tp); 622 623 psc->pts_flags &= ~PTS_FINISHED; 624 625 return (0); 626} 627 628static void 629ptsdrv_close(struct tty *tp) 630{ 631 struct pts_softc *psc = tty_softc(tp); 632 633 /* Wake up any blocked readers/writers. */ 634 psc->pts_flags |= PTS_FINISHED; 635 ptsdrv_outwakeup(tp); 636 ptsdrv_inwakeup(tp); 637} 638 639static void 640ptsdrv_pktnotify(struct tty *tp, char event) 641{ 642 struct pts_softc *psc = tty_softc(tp); 643 644 /* 645 * Clear conflicting flags. 646 */ 647 648 switch (event) { 649 case TIOCPKT_STOP: 650 psc->pts_pkt &= ~TIOCPKT_START; 651 break; 652 case TIOCPKT_START: 653 psc->pts_pkt &= ~TIOCPKT_STOP; 654 break; 655 case TIOCPKT_NOSTOP: 656 psc->pts_pkt &= ~TIOCPKT_DOSTOP; 657 break; 658 case TIOCPKT_DOSTOP: 659 psc->pts_pkt &= ~TIOCPKT_NOSTOP; 660 break; 661 } 662 663 psc->pts_pkt |= event; 664 ptsdrv_outwakeup(tp); 665} 666 667static void 668ptsdrv_free(void *softc) 669{ 670 struct pts_softc *psc = softc; 671 672 /* Make device number available again. */ 673 if (psc->pts_unit >= 0) 674 free_unr(pts_pool, psc->pts_unit); 675 676 chgptscnt(psc->pts_uidinfo, -1, 0); 677 uifree(psc->pts_uidinfo); 678 679 knlist_destroy(&psc->pts_inpoll.si_note); 680 knlist_destroy(&psc->pts_outpoll.si_note); 681 682#ifdef PTS_EXTERNAL 683 /* Destroy master device as well. */ 684 if (psc->pts_cdev != NULL) 685 destroy_dev_sched(psc->pts_cdev); 686#endif /* PTS_EXTERNAL */ 687 688 free(psc, M_PTS); 689} 690 691static struct ttydevsw pts_class = { 692 .tsw_flags = TF_NOPREFIX, 693 .tsw_outwakeup = ptsdrv_outwakeup, 694 .tsw_inwakeup = ptsdrv_inwakeup, 695 .tsw_open = ptsdrv_open, 696 .tsw_close = ptsdrv_close, 697 .tsw_pktnotify = ptsdrv_pktnotify, 698 .tsw_free = ptsdrv_free, 699}; 700 701static int 702pts_alloc(int fflags, struct thread *td, struct file *fp) 703{ 704 int unit, ok; 705 struct tty *tp; 706 struct pts_softc *psc; 707 struct proc *p = td->td_proc; 708 struct uidinfo *uid = td->td_ucred->cr_ruidinfo; 709 710 /* Resource limiting. */ 711 PROC_LOCK(p); 712 ok = chgptscnt(uid, 1, lim_cur(p, RLIMIT_NPTS)); 713 PROC_UNLOCK(p); 714 if (!ok) 715 return (EAGAIN); 716 717 /* Try to allocate a new pts unit number. */ 718 unit = alloc_unr(pts_pool); 719 if (unit < 0) { 720 chgptscnt(uid, -1, 0); 721 return (EAGAIN); 722 } 723 if (unit > pts_maxdev) { 724 free_unr(pts_pool, unit); 725 chgptscnt(uid, -1, 0); 726 return (EAGAIN); 727 } 728 729 /* Allocate TTY and softc. */ 730 psc = malloc(sizeof(struct pts_softc), M_PTS, M_WAITOK|M_ZERO); 731 cv_init(&psc->pts_inwait, "pts inwait"); 732 cv_init(&psc->pts_outwait, "pts outwait"); 733 734 psc->pts_unit = unit; 735 psc->pts_uidinfo = uid; 736 uihold(uid); 737 738 tp = tty_alloc(&pts_class, psc); 739 knlist_init_mtx(&psc->pts_inpoll.si_note, tp->t_mtx); 740 knlist_init_mtx(&psc->pts_outpoll.si_note, tp->t_mtx); 741 742 /* Expose the slave device as well. */ 743 tty_makedev(tp, td->td_ucred, "pts/%u", psc->pts_unit); 744 745 finit(fp, fflags, DTYPE_PTS, tp, &ptsdev_ops); 746 747 return (0); 748} 749 750#ifdef PTS_EXTERNAL 751int 752pts_alloc_external(int fflags, struct thread *td, struct file *fp, 753 struct cdev *dev, const char *name) 754{ 755 int ok; 756 struct tty *tp; 757 struct pts_softc *psc; 758 struct proc *p = td->td_proc; 759 struct uidinfo *uid = td->td_ucred->cr_ruidinfo; 760 761 /* Resource limiting. */ 762 PROC_LOCK(p); 763 ok = chgptscnt(uid, 1, lim_cur(p, RLIMIT_NPTS)); 764 PROC_UNLOCK(p); 765 if (!ok) 766 return (EAGAIN); 767 768 /* Allocate TTY and softc. */ 769 psc = malloc(sizeof(struct pts_softc), M_PTS, M_WAITOK|M_ZERO); 770 cv_init(&psc->pts_inwait, "pts inwait"); 771 cv_init(&psc->pts_outwait, "pts outwait"); 772 773 psc->pts_unit = -1; 774 psc->pts_cdev = dev; 775 psc->pts_uidinfo = uid; 776 uihold(uid); 777 778 tp = tty_alloc(&pts_class, psc); 779 knlist_init_mtx(&psc->pts_inpoll.si_note, tp->t_mtx); 780 knlist_init_mtx(&psc->pts_outpoll.si_note, tp->t_mtx); 781 782 /* Expose the slave device as well. */ 783 tty_makedev(tp, td->td_ucred, "%s", name); 784 785 finit(fp, fflags, DTYPE_PTS, tp, &ptsdev_ops); 786 787 return (0); 788} 789#endif /* PTS_EXTERNAL */ 790 791int 792posix_openpt(struct thread *td, struct posix_openpt_args *uap) 793{ 794 int error, fd; 795 struct file *fp; 796 797 /* 798 * POSIX states it's unspecified when other flags are passed. We 799 * don't allow this. 800 */ 801 if (uap->flags & ~(O_RDWR|O_NOCTTY)) 802 return (EINVAL); 803 804 error = falloc(td, &fp, &fd); 805 if (error) 806 return (error); 807 808 /* Allocate the actual pseudo-TTY. */ 809 error = pts_alloc(FFLAGS(uap->flags & O_ACCMODE), td, fp); 810 if (error != 0) { 811 fdclose(td->td_proc->p_fd, fp, fd, td); 812 return (error); 813 } 814 815 /* Pass it back to userspace. */ 816 td->td_retval[0] = fd; 817 fdrop(fp, td); 818 819 return (0); 820} 821 822#if defined(PTS_COMPAT) || defined(PTS_LINUX) 823static int 824ptmx_fdopen(struct cdev *dev, int fflags, struct thread *td, struct file *fp) 825{ 826 827 return (pts_alloc(fflags & (FREAD|FWRITE), td, fp)); 828} 829 830static struct cdevsw ptmx_cdevsw = { 831 .d_version = D_VERSION, 832 .d_fdopen = ptmx_fdopen, 833 .d_name = "ptmx", 834}; 835#endif /* PTS_COMPAT || PTS_LINUX */ 836 837static void 838pts_init(void *unused) 839{ 840 841 pts_pool = new_unrhdr(0, INT_MAX, NULL); 842#if defined(PTS_COMPAT) || defined(PTS_LINUX) 843 make_dev(&ptmx_cdevsw, 0, UID_ROOT, GID_WHEEL, 0666, "ptmx"); 844#endif /* PTS_COMPAT || PTS_LINUX */ 845} 846 847SYSINIT(pts, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, pts_init, NULL);
| 37/* Add bits to make Linux binaries work. */ 38#define PTS_LINUX 39 40#include <sys/param.h> 41#include <sys/lock.h> 42#include <sys/condvar.h> 43#include <sys/conf.h> 44#include <sys/fcntl.h> 45#include <sys/file.h> 46#include <sys/filedesc.h> 47#include <sys/filio.h> 48#include <sys/kernel.h> 49#include <sys/limits.h> 50#include <sys/malloc.h> 51#include <sys/poll.h> 52#include <sys/proc.h> 53#include <sys/resourcevar.h> 54#include <sys/serial.h> 55#include <sys/stat.h> 56#include <sys/syscall.h> 57#include <sys/syscallsubr.h> 58#include <sys/sysctl.h> 59#include <sys/sysent.h> 60#include <sys/sysproto.h> 61#include <sys/systm.h> 62#include <sys/tty.h> 63#include <sys/ttycom.h> 64 65#include <machine/stdarg.h> 66 67/* 68 * Our utmp(5) format is limited to 8-byte TTY line names. This means 69 * we can at most allocate 1000 pseudo-terminals ("pts/999"). Allow 70 * users to increase this number, assuming they have manually increased 71 * UT_LINESIZE. 72 */ 73static struct unrhdr *pts_pool; 74static unsigned int pts_maxdev = 999; 75SYSCTL_UINT(_kern, OID_AUTO, pts_maxdev, CTLFLAG_RW, &pts_maxdev, 0, 76 "Maximum amount of pts(4) pseudo-terminals"); 77 78static MALLOC_DEFINE(M_PTS, "pts", "pseudo tty device"); 79 80/* 81 * Per-PTS structure. 82 * 83 * List of locks 84 * (t) locked by tty_lock() 85 * (c) const until freeing 86 */ 87struct pts_softc { 88 int pts_unit; /* (c) Device unit number. */ 89 unsigned int pts_flags; /* (t) Device flags. */ 90#define PTS_PKT 0x1 /* Packet mode. */ 91#define PTS_FINISHED 0x2 /* Return errors on read()/write(). */ 92 char pts_pkt; /* (t) Unread packet mode data. */ 93 94 struct cv pts_inwait; /* (t) Blocking write() on master. */ 95 struct selinfo pts_inpoll; /* (t) Select queue for write(). */ 96 struct cv pts_outwait; /* (t) Blocking read() on master. */ 97 struct selinfo pts_outpoll; /* (t) Select queue for read(). */ 98 99#ifdef PTS_EXTERNAL 100 struct cdev *pts_cdev; /* (c) Master device node. */ 101#endif /* PTS_EXTERNAL */ 102 103 struct uidinfo *pts_uidinfo; /* (c) Resource limit. */ 104}; 105 106/* 107 * Controller-side file operations. 108 */ 109 110static int 111ptsdev_read(struct file *fp, struct uio *uio, struct ucred *active_cred, 112 int flags, struct thread *td) 113{ 114 struct tty *tp = fp->f_data; 115 struct pts_softc *psc = tty_softc(tp); 116 int error = 0; 117 char pkt; 118 119 if (uio->uio_resid == 0) 120 return (0); 121 122 tty_lock(tp); 123 124 for (;;) { 125 /* 126 * Implement packet mode. When packet mode is turned on, 127 * the first byte contains a bitmask of events that 128 * occured (start, stop, flush, window size, etc). 129 */ 130 if (psc->pts_flags & PTS_PKT && psc->pts_pkt) { 131 pkt = psc->pts_pkt; 132 psc->pts_pkt = 0; 133 tty_unlock(tp); 134 135 error = ureadc(pkt, uio); 136 return (error); 137 } 138 139 /* 140 * Transmit regular data. 141 * 142 * XXX: We shouldn't use ttydisc_getc_poll()! Even 143 * though in this implementation, there is likely going 144 * to be data, we should just call ttydisc_getc_uio() 145 * and use its return value to sleep. 146 */ 147 if (ttydisc_getc_poll(tp)) { 148 if (psc->pts_flags & PTS_PKT) { 149 /* 150 * XXX: Small race. Fortunately PTY 151 * consumers aren't multithreaded. 152 */ 153 154 tty_unlock(tp); 155 error = ureadc(TIOCPKT_DATA, uio); 156 if (error) 157 return (error); 158 tty_lock(tp); 159 } 160 161 error = ttydisc_getc_uio(tp, uio); 162 break; 163 } 164 165 /* Maybe the device isn't used anyway. */ 166 if (psc->pts_flags & PTS_FINISHED) 167 break; 168 169 /* Wait for more data. */ 170 if (fp->f_flag & O_NONBLOCK) { 171 error = EWOULDBLOCK; 172 break; 173 } 174 error = cv_wait_sig(&psc->pts_outwait, tp->t_mtx); 175 if (error != 0) 176 break; 177 } 178 179 tty_unlock(tp); 180 181 return (error); 182} 183 184static int 185ptsdev_write(struct file *fp, struct uio *uio, struct ucred *active_cred, 186 int flags, struct thread *td) 187{ 188 struct tty *tp = fp->f_data; 189 struct pts_softc *psc = tty_softc(tp); 190 char ib[256], *ibstart; 191 size_t iblen, rintlen; 192 int error = 0; 193 194 if (uio->uio_resid == 0) 195 return (0); 196 197 for (;;) { 198 ibstart = ib; 199 iblen = MIN(uio->uio_resid, sizeof ib); 200 error = uiomove(ib, iblen, uio); 201 202 tty_lock(tp); 203 if (error != 0) { 204 iblen = 0; 205 goto done; 206 } 207 208 /* 209 * When possible, avoid the slow path. rint_bypass() 210 * copies all input to the input queue at once. 211 */ 212 MPASS(iblen > 0); 213 do { 214 rintlen = ttydisc_rint_simple(tp, ibstart, iblen); 215 ibstart += rintlen; 216 iblen -= rintlen; 217 if (iblen == 0) { 218 /* All data written. */ 219 break; 220 } 221 222 /* Maybe the device isn't used anyway. */ 223 if (psc->pts_flags & PTS_FINISHED) { 224 error = EIO; 225 goto done; 226 } 227 228 /* Wait for more data. */ 229 if (fp->f_flag & O_NONBLOCK) { 230 error = EWOULDBLOCK; 231 goto done; 232 } 233 234 /* Wake up users on the slave side. */ 235 ttydisc_rint_done(tp); 236 error = cv_wait_sig(&psc->pts_inwait, tp->t_mtx); 237 if (error != 0) 238 goto done; 239 } while (iblen > 0); 240 241 if (uio->uio_resid == 0) 242 break; 243 tty_unlock(tp); 244 } 245 246done: ttydisc_rint_done(tp); 247 tty_unlock(tp); 248 249 /* 250 * Don't account for the part of the buffer that we couldn't 251 * pass to the TTY. 252 */ 253 uio->uio_resid += iblen; 254 return (error); 255} 256 257static int 258ptsdev_truncate(struct file *fp, off_t length, struct ucred *active_cred, 259 struct thread *td) 260{ 261 262 return (EINVAL); 263} 264 265static int 266ptsdev_ioctl(struct file *fp, u_long cmd, void *data, 267 struct ucred *active_cred, struct thread *td) 268{ 269 struct tty *tp = fp->f_data; 270 struct pts_softc *psc = tty_softc(tp); 271 int error = 0, sig; 272 273 switch (cmd) { 274 case FIONBIO: 275 /* This device supports non-blocking operation. */ 276 return (0); 277 case FIONREAD: 278 tty_lock(tp); 279 if (psc->pts_flags & PTS_FINISHED) { 280 /* Force read() to be called. */ 281 *(int *)data = 1; 282 } else { 283 *(int *)data = ttydisc_getc_poll(tp); 284 } 285 tty_unlock(tp); 286 return (0); 287 case FIODGNAME: { 288 struct fiodgname_arg *fgn; 289 const char *p; 290 int i; 291 292 /* Reverse device name lookups, for ptsname() and ttyname(). */ 293 fgn = data; 294 p = tty_devname(tp); 295 i = strlen(p) + 1; 296 if (i > fgn->len) 297 return (EINVAL); 298 return copyout(p, fgn->buf, i); 299 } 300 301 /* 302 * We need to implement TIOCGPGRP and TIOCGSID here again. When 303 * called on the pseudo-terminal master, it should not check if 304 * the terminal is the foreground terminal of the calling 305 * process. 306 * 307 * TIOCGETA is also implemented here. Various Linux PTY routines 308 * often call isatty(), which is implemented by tcgetattr(). 309 */ 310#ifdef PTS_LINUX 311 case TIOCGETA: 312 /* Obtain terminal flags through tcgetattr(). */ 313 tty_lock(tp); 314 *(struct termios*)data = tp->t_termios; 315 tty_unlock(tp); 316 return (0); 317#endif /* PTS_LINUX */ 318 case TIOCSETAF: 319 case TIOCSETAW: 320 /* 321 * We must make sure we turn tcsetattr() calls of TCSAFLUSH and 322 * TCSADRAIN into something different. If an application would 323 * call TCSAFLUSH or TCSADRAIN on the master descriptor, it may 324 * deadlock waiting for all data to be read. 325 */ 326 cmd = TIOCSETA; 327 break; 328#if defined(PTS_COMPAT) || defined(PTS_LINUX) 329 case TIOCGPTN: 330 /* 331 * Get the device unit number. 332 */ 333 if (psc->pts_unit < 0) 334 return (ENOTTY); 335 *(unsigned int *)data = psc->pts_unit; 336 return (0); 337#endif /* PTS_COMPAT || PTS_LINUX */ 338 case TIOCGPGRP: 339 /* Get the foreground process group ID. */ 340 tty_lock(tp); 341 if (tp->t_pgrp != NULL) 342 *(int *)data = tp->t_pgrp->pg_id; 343 else 344 *(int *)data = NO_PID; 345 tty_unlock(tp); 346 return (0); 347 case TIOCGSID: 348 /* Get the session leader process ID. */ 349 tty_lock(tp); 350 if (tp->t_session == NULL) 351 error = ENOTTY; 352 else 353 *(int *)data = tp->t_session->s_sid; 354 tty_unlock(tp); 355 return (error); 356 case TIOCPTMASTER: 357 /* Yes, we are a pseudo-terminal master. */ 358 return (0); 359 case TIOCSIG: 360 /* Signal the foreground process group. */ 361 sig = *(int *)data; 362 if (sig < 1 || sig >= NSIG) 363 return (EINVAL); 364 365 tty_lock(tp); 366 tty_signal_pgrp(tp, sig); 367 tty_unlock(tp); 368 return (0); 369 case TIOCPKT: 370 /* Enable/disable packet mode. */ 371 tty_lock(tp); 372 if (*(int *)data) 373 psc->pts_flags |= PTS_PKT; 374 else 375 psc->pts_flags &= ~PTS_PKT; 376 tty_unlock(tp); 377 return (0); 378 } 379 380 /* Just redirect this ioctl to the slave device. */ 381 tty_lock(tp); 382 error = tty_ioctl(tp, cmd, data, td); 383 tty_unlock(tp); 384 if (error == ENOIOCTL) 385 error = ENOTTY; 386 387 return (error); 388} 389 390static int 391ptsdev_poll(struct file *fp, int events, struct ucred *active_cred, 392 struct thread *td) 393{ 394 struct tty *tp = fp->f_data; 395 struct pts_softc *psc = tty_softc(tp); 396 int revents = 0; 397 398 tty_lock(tp); 399 400 if (psc->pts_flags & PTS_FINISHED) { 401 /* Slave device is not opened. */ 402 tty_unlock(tp); 403 return ((events & (POLLIN|POLLRDNORM)) | POLLHUP); 404 } 405 406 if (events & (POLLIN|POLLRDNORM)) { 407 /* See if we can getc something. */ 408 if (ttydisc_getc_poll(tp) || 409 (psc->pts_flags & PTS_PKT && psc->pts_pkt)) 410 revents |= events & (POLLIN|POLLRDNORM); 411 } 412 if (events & (POLLOUT|POLLWRNORM)) { 413 /* See if we can rint something. */ 414 if (ttydisc_rint_poll(tp)) 415 revents |= events & (POLLOUT|POLLWRNORM); 416 } 417 418 /* 419 * No need to check for POLLHUP here. This device cannot be used 420 * as a callout device, which means we always have a carrier, 421 * because the master is. 422 */ 423 424 if (revents == 0) { 425 /* 426 * This code might look misleading, but the naming of 427 * poll events on this side is the opposite of the slave 428 * device. 429 */ 430 if (events & (POLLIN|POLLRDNORM)) 431 selrecord(td, &psc->pts_outpoll); 432 if (events & (POLLOUT|POLLWRNORM)) 433 selrecord(td, &psc->pts_inpoll); 434 } 435 436 tty_unlock(tp); 437 438 return (revents); 439} 440 441/* 442 * kqueue support. 443 */ 444 445static void 446pts_kqops_read_detach(struct knote *kn) 447{ 448 struct file *fp = kn->kn_fp; 449 struct tty *tp = fp->f_data; 450 struct pts_softc *psc = tty_softc(tp); 451 452 knlist_remove(&psc->pts_outpoll.si_note, kn, 0); 453} 454 455static int 456pts_kqops_read_event(struct knote *kn, long hint) 457{ 458 struct file *fp = kn->kn_fp; 459 struct tty *tp = fp->f_data; 460 struct pts_softc *psc = tty_softc(tp); 461 462 if (psc->pts_flags & PTS_FINISHED) { 463 kn->kn_flags |= EV_EOF; 464 return (1); 465 } else { 466 kn->kn_data = ttydisc_getc_poll(tp); 467 return (kn->kn_data > 0); 468 } 469} 470 471static void 472pts_kqops_write_detach(struct knote *kn) 473{ 474 struct file *fp = kn->kn_fp; 475 struct tty *tp = fp->f_data; 476 struct pts_softc *psc = tty_softc(tp); 477 478 knlist_remove(&psc->pts_inpoll.si_note, kn, 0); 479} 480 481static int 482pts_kqops_write_event(struct knote *kn, long hint) 483{ 484 struct file *fp = kn->kn_fp; 485 struct tty *tp = fp->f_data; 486 struct pts_softc *psc = tty_softc(tp); 487 488 if (psc->pts_flags & PTS_FINISHED) { 489 kn->kn_flags |= EV_EOF; 490 return (1); 491 } else { 492 kn->kn_data = ttydisc_rint_poll(tp); 493 return (kn->kn_data > 0); 494 } 495} 496 497static struct filterops pts_kqops_read = 498 { 1, NULL, pts_kqops_read_detach, pts_kqops_read_event }; 499static struct filterops pts_kqops_write = 500 { 1, NULL, pts_kqops_write_detach, pts_kqops_write_event }; 501 502static int 503ptsdev_kqfilter(struct file *fp, struct knote *kn) 504{ 505 struct tty *tp = fp->f_data; 506 struct pts_softc *psc = tty_softc(tp); 507 int error = 0; 508 509 tty_lock(tp); 510 511 switch (kn->kn_filter) { 512 case EVFILT_READ: 513 kn->kn_fop = &pts_kqops_read; 514 knlist_add(&psc->pts_outpoll.si_note, kn, 1); 515 break; 516 case EVFILT_WRITE: 517 kn->kn_fop = &pts_kqops_write; 518 knlist_add(&psc->pts_inpoll.si_note, kn, 1); 519 break; 520 default: 521 error = EINVAL; 522 break; 523 } 524 525 tty_unlock(tp); 526 return (error); 527} 528 529static int 530ptsdev_stat(struct file *fp, struct stat *sb, struct ucred *active_cred, 531 struct thread *td) 532{ 533 struct tty *tp = fp->f_data; 534#ifdef PTS_EXTERNAL 535 struct pts_softc *psc = tty_softc(tp); 536#endif /* PTS_EXTERNAL */ 537 struct cdev *dev = tp->t_dev; 538 539 /* 540 * According to POSIX, we must implement an fstat(). This also 541 * makes this implementation compatible with Linux binaries, 542 * because Linux calls fstat() on the pseudo-terminal master to 543 * obtain st_rdev. 544 * 545 * XXX: POSIX also mentions we must fill in st_dev, but how? 546 */ 547 548 bzero(sb, sizeof *sb); 549#ifdef PTS_EXTERNAL 550 if (psc->pts_cdev != NULL) 551 sb->st_ino = sb->st_rdev = dev2udev(psc->pts_cdev); 552 else 553#endif /* PTS_EXTERNAL */ 554 sb->st_ino = sb->st_rdev = tty_udev(tp); 555 556 sb->st_atimespec = dev->si_atime; 557 sb->st_ctimespec = dev->si_ctime; 558 sb->st_mtimespec = dev->si_mtime; 559 sb->st_uid = dev->si_uid; 560 sb->st_gid = dev->si_gid; 561 sb->st_mode = dev->si_mode | S_IFCHR; 562 563 return (0); 564} 565 566static int 567ptsdev_close(struct file *fp, struct thread *td) 568{ 569 struct tty *tp = fp->f_data; 570 571 /* Deallocate TTY device. */ 572 tty_lock(tp); 573 tty_rel_gone(tp); 574 575 return (0); 576} 577 578static struct fileops ptsdev_ops = { 579 .fo_read = ptsdev_read, 580 .fo_write = ptsdev_write, 581 .fo_truncate = ptsdev_truncate, 582 .fo_ioctl = ptsdev_ioctl, 583 .fo_poll = ptsdev_poll, 584 .fo_kqfilter = ptsdev_kqfilter, 585 .fo_stat = ptsdev_stat, 586 .fo_close = ptsdev_close, 587 .fo_flags = DFLAG_PASSABLE, 588}; 589 590/* 591 * Driver-side hooks. 592 */ 593 594static void 595ptsdrv_outwakeup(struct tty *tp) 596{ 597 struct pts_softc *psc = tty_softc(tp); 598 599 cv_broadcast(&psc->pts_outwait); 600 selwakeup(&psc->pts_outpoll); 601 KNOTE_LOCKED(&psc->pts_outpoll.si_note, 0); 602} 603 604static void 605ptsdrv_inwakeup(struct tty *tp) 606{ 607 struct pts_softc *psc = tty_softc(tp); 608 609 cv_broadcast(&psc->pts_inwait); 610 selwakeup(&psc->pts_inpoll); 611 KNOTE_LOCKED(&psc->pts_inpoll.si_note, 0); 612} 613 614static int 615ptsdrv_open(struct tty *tp) 616{ 617 struct pts_softc *psc = tty_softc(tp); 618 619 psc->pts_flags &= ~PTS_FINISHED; 620 621 return (0); 622} 623 624static void 625ptsdrv_close(struct tty *tp) 626{ 627 struct pts_softc *psc = tty_softc(tp); 628 629 /* Wake up any blocked readers/writers. */ 630 psc->pts_flags |= PTS_FINISHED; 631 ptsdrv_outwakeup(tp); 632 ptsdrv_inwakeup(tp); 633} 634 635static void 636ptsdrv_pktnotify(struct tty *tp, char event) 637{ 638 struct pts_softc *psc = tty_softc(tp); 639 640 /* 641 * Clear conflicting flags. 642 */ 643 644 switch (event) { 645 case TIOCPKT_STOP: 646 psc->pts_pkt &= ~TIOCPKT_START; 647 break; 648 case TIOCPKT_START: 649 psc->pts_pkt &= ~TIOCPKT_STOP; 650 break; 651 case TIOCPKT_NOSTOP: 652 psc->pts_pkt &= ~TIOCPKT_DOSTOP; 653 break; 654 case TIOCPKT_DOSTOP: 655 psc->pts_pkt &= ~TIOCPKT_NOSTOP; 656 break; 657 } 658 659 psc->pts_pkt |= event; 660 ptsdrv_outwakeup(tp); 661} 662 663static void 664ptsdrv_free(void *softc) 665{ 666 struct pts_softc *psc = softc; 667 668 /* Make device number available again. */ 669 if (psc->pts_unit >= 0) 670 free_unr(pts_pool, psc->pts_unit); 671 672 chgptscnt(psc->pts_uidinfo, -1, 0); 673 uifree(psc->pts_uidinfo); 674 675 knlist_destroy(&psc->pts_inpoll.si_note); 676 knlist_destroy(&psc->pts_outpoll.si_note); 677 678#ifdef PTS_EXTERNAL 679 /* Destroy master device as well. */ 680 if (psc->pts_cdev != NULL) 681 destroy_dev_sched(psc->pts_cdev); 682#endif /* PTS_EXTERNAL */ 683 684 free(psc, M_PTS); 685} 686 687static struct ttydevsw pts_class = { 688 .tsw_flags = TF_NOPREFIX, 689 .tsw_outwakeup = ptsdrv_outwakeup, 690 .tsw_inwakeup = ptsdrv_inwakeup, 691 .tsw_open = ptsdrv_open, 692 .tsw_close = ptsdrv_close, 693 .tsw_pktnotify = ptsdrv_pktnotify, 694 .tsw_free = ptsdrv_free, 695}; 696 697static int 698pts_alloc(int fflags, struct thread *td, struct file *fp) 699{ 700 int unit, ok; 701 struct tty *tp; 702 struct pts_softc *psc; 703 struct proc *p = td->td_proc; 704 struct uidinfo *uid = td->td_ucred->cr_ruidinfo; 705 706 /* Resource limiting. */ 707 PROC_LOCK(p); 708 ok = chgptscnt(uid, 1, lim_cur(p, RLIMIT_NPTS)); 709 PROC_UNLOCK(p); 710 if (!ok) 711 return (EAGAIN); 712 713 /* Try to allocate a new pts unit number. */ 714 unit = alloc_unr(pts_pool); 715 if (unit < 0) { 716 chgptscnt(uid, -1, 0); 717 return (EAGAIN); 718 } 719 if (unit > pts_maxdev) { 720 free_unr(pts_pool, unit); 721 chgptscnt(uid, -1, 0); 722 return (EAGAIN); 723 } 724 725 /* Allocate TTY and softc. */ 726 psc = malloc(sizeof(struct pts_softc), M_PTS, M_WAITOK|M_ZERO); 727 cv_init(&psc->pts_inwait, "pts inwait"); 728 cv_init(&psc->pts_outwait, "pts outwait"); 729 730 psc->pts_unit = unit; 731 psc->pts_uidinfo = uid; 732 uihold(uid); 733 734 tp = tty_alloc(&pts_class, psc); 735 knlist_init_mtx(&psc->pts_inpoll.si_note, tp->t_mtx); 736 knlist_init_mtx(&psc->pts_outpoll.si_note, tp->t_mtx); 737 738 /* Expose the slave device as well. */ 739 tty_makedev(tp, td->td_ucred, "pts/%u", psc->pts_unit); 740 741 finit(fp, fflags, DTYPE_PTS, tp, &ptsdev_ops); 742 743 return (0); 744} 745 746#ifdef PTS_EXTERNAL 747int 748pts_alloc_external(int fflags, struct thread *td, struct file *fp, 749 struct cdev *dev, const char *name) 750{ 751 int ok; 752 struct tty *tp; 753 struct pts_softc *psc; 754 struct proc *p = td->td_proc; 755 struct uidinfo *uid = td->td_ucred->cr_ruidinfo; 756 757 /* Resource limiting. */ 758 PROC_LOCK(p); 759 ok = chgptscnt(uid, 1, lim_cur(p, RLIMIT_NPTS)); 760 PROC_UNLOCK(p); 761 if (!ok) 762 return (EAGAIN); 763 764 /* Allocate TTY and softc. */ 765 psc = malloc(sizeof(struct pts_softc), M_PTS, M_WAITOK|M_ZERO); 766 cv_init(&psc->pts_inwait, "pts inwait"); 767 cv_init(&psc->pts_outwait, "pts outwait"); 768 769 psc->pts_unit = -1; 770 psc->pts_cdev = dev; 771 psc->pts_uidinfo = uid; 772 uihold(uid); 773 774 tp = tty_alloc(&pts_class, psc); 775 knlist_init_mtx(&psc->pts_inpoll.si_note, tp->t_mtx); 776 knlist_init_mtx(&psc->pts_outpoll.si_note, tp->t_mtx); 777 778 /* Expose the slave device as well. */ 779 tty_makedev(tp, td->td_ucred, "%s", name); 780 781 finit(fp, fflags, DTYPE_PTS, tp, &ptsdev_ops); 782 783 return (0); 784} 785#endif /* PTS_EXTERNAL */ 786 787int 788posix_openpt(struct thread *td, struct posix_openpt_args *uap) 789{ 790 int error, fd; 791 struct file *fp; 792 793 /* 794 * POSIX states it's unspecified when other flags are passed. We 795 * don't allow this. 796 */ 797 if (uap->flags & ~(O_RDWR|O_NOCTTY)) 798 return (EINVAL); 799 800 error = falloc(td, &fp, &fd); 801 if (error) 802 return (error); 803 804 /* Allocate the actual pseudo-TTY. */ 805 error = pts_alloc(FFLAGS(uap->flags & O_ACCMODE), td, fp); 806 if (error != 0) { 807 fdclose(td->td_proc->p_fd, fp, fd, td); 808 return (error); 809 } 810 811 /* Pass it back to userspace. */ 812 td->td_retval[0] = fd; 813 fdrop(fp, td); 814 815 return (0); 816} 817 818#if defined(PTS_COMPAT) || defined(PTS_LINUX) 819static int 820ptmx_fdopen(struct cdev *dev, int fflags, struct thread *td, struct file *fp) 821{ 822 823 return (pts_alloc(fflags & (FREAD|FWRITE), td, fp)); 824} 825 826static struct cdevsw ptmx_cdevsw = { 827 .d_version = D_VERSION, 828 .d_fdopen = ptmx_fdopen, 829 .d_name = "ptmx", 830}; 831#endif /* PTS_COMPAT || PTS_LINUX */ 832 833static void 834pts_init(void *unused) 835{ 836 837 pts_pool = new_unrhdr(0, INT_MAX, NULL); 838#if defined(PTS_COMPAT) || defined(PTS_LINUX) 839 make_dev(&ptmx_cdevsw, 0, UID_ROOT, GID_WHEEL, 0666, "ptmx"); 840#endif /* PTS_COMPAT || PTS_LINUX */ 841} 842 843SYSINIT(pts, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, pts_init, NULL);
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