1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2007 Roman Divacky 5 * Copyright (c) 2014 Dmitry Chagin 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include "opt_compat.h" 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/imgact.h> 38 #include <sys/kernel.h> 39 #include <sys/limits.h> 40 #include <sys/lock.h> 41 #include <sys/mutex.h> 42 #include <sys/callout.h> 43 #include <sys/capsicum.h> 44 #include <sys/types.h> 45 #include <sys/user.h> 46 #include <sys/file.h> 47 #include <sys/filedesc.h> 48 #include <sys/filio.h> 49 #include <sys/errno.h> 50 #include <sys/event.h> 51 #include <sys/poll.h> 52 #include <sys/proc.h> 53 #include <sys/selinfo.h> 54 #include <sys/specialfd.h> 55 #include <sys/sx.h> 56 #include <sys/syscallsubr.h> 57 #include <sys/timespec.h> 58 #include <sys/eventfd.h> 59 60 #ifdef COMPAT_LINUX32 61 #include <machine/../linux32/linux.h> 62 #include <machine/../linux32/linux32_proto.h> 63 #else 64 #include <machine/../linux/linux.h> 65 #include <machine/../linux/linux_proto.h> 66 #endif 67 68 #include <compat/linux/linux_emul.h> 69 #include <compat/linux/linux_event.h> 70 #include <compat/linux/linux_file.h> 71 #include <compat/linux/linux_timer.h> 72 #include <compat/linux/linux_util.h> 73 74 typedef uint64_t epoll_udata_t; 75 76 struct epoll_event { 77 uint32_t events; 78 epoll_udata_t data; 79 } 80 #if defined(__amd64__) 81 __attribute__((packed)) 82 #endif 83 ; 84 85 #define LINUX_MAX_EVENTS (INT_MAX / sizeof(struct epoll_event)) 86 87 static int epoll_to_kevent(struct thread *td, int fd, 88 struct epoll_event *l_event, struct kevent *kevent, 89 int *nkevents); 90 static void kevent_to_epoll(struct kevent *kevent, struct epoll_event *l_event); 91 static int epoll_kev_copyout(void *arg, struct kevent *kevp, int count); 92 static int epoll_kev_copyin(void *arg, struct kevent *kevp, int count); 93 static int epoll_register_kevent(struct thread *td, struct file *epfp, 94 int fd, int filter, unsigned int flags); 95 static int epoll_fd_registered(struct thread *td, struct file *epfp, 96 int fd); 97 static int epoll_delete_all_events(struct thread *td, struct file *epfp, 98 int fd); 99 100 struct epoll_copyin_args { 101 struct kevent *changelist; 102 }; 103 104 struct epoll_copyout_args { 105 struct epoll_event *leventlist; 106 struct proc *p; 107 uint32_t count; 108 int error; 109 }; 110 111 /* timerfd */ 112 typedef uint64_t timerfd_t; 113 114 static fo_rdwr_t timerfd_read; 115 static fo_ioctl_t timerfd_ioctl; 116 static fo_poll_t timerfd_poll; 117 static fo_kqfilter_t timerfd_kqfilter; 118 static fo_stat_t timerfd_stat; 119 static fo_close_t timerfd_close; 120 static fo_fill_kinfo_t timerfd_fill_kinfo; 121 122 static struct fileops timerfdops = { 123 .fo_read = timerfd_read, 124 .fo_write = invfo_rdwr, 125 .fo_truncate = invfo_truncate, 126 .fo_ioctl = timerfd_ioctl, 127 .fo_poll = timerfd_poll, 128 .fo_kqfilter = timerfd_kqfilter, 129 .fo_stat = timerfd_stat, 130 .fo_close = timerfd_close, 131 .fo_chmod = invfo_chmod, 132 .fo_chown = invfo_chown, 133 .fo_sendfile = invfo_sendfile, 134 .fo_fill_kinfo = timerfd_fill_kinfo, 135 .fo_flags = DFLAG_PASSABLE 136 }; 137 138 static void filt_timerfddetach(struct knote *kn); 139 static int filt_timerfdread(struct knote *kn, long hint); 140 141 static struct filterops timerfd_rfiltops = { 142 .f_isfd = 1, 143 .f_detach = filt_timerfddetach, 144 .f_event = filt_timerfdread 145 }; 146 147 struct timerfd { 148 clockid_t tfd_clockid; 149 struct itimerspec tfd_time; 150 struct callout tfd_callout; 151 timerfd_t tfd_count; 152 bool tfd_canceled; 153 struct selinfo tfd_sel; 154 struct mtx tfd_lock; 155 }; 156 157 static void linux_timerfd_expire(void *); 158 static void linux_timerfd_curval(struct timerfd *, struct itimerspec *); 159 160 static int 161 epoll_create_common(struct thread *td, int flags) 162 { 163 164 return (kern_kqueue(td, flags, NULL)); 165 } 166 167 #ifdef LINUX_LEGACY_SYSCALLS 168 int 169 linux_epoll_create(struct thread *td, struct linux_epoll_create_args *args) 170 { 171 172 /* 173 * args->size is unused. Linux just tests it 174 * and then forgets it as well. 175 */ 176 if (args->size <= 0) 177 return (EINVAL); 178 179 return (epoll_create_common(td, 0)); 180 } 181 #endif 182 183 int 184 linux_epoll_create1(struct thread *td, struct linux_epoll_create1_args *args) 185 { 186 int flags; 187 188 if ((args->flags & ~(LINUX_O_CLOEXEC)) != 0) 189 return (EINVAL); 190 191 flags = 0; 192 if ((args->flags & LINUX_O_CLOEXEC) != 0) 193 flags |= O_CLOEXEC; 194 195 return (epoll_create_common(td, flags)); 196 } 197 198 /* Structure converting function from epoll to kevent. */ 199 static int 200 epoll_to_kevent(struct thread *td, int fd, struct epoll_event *l_event, 201 struct kevent *kevent, int *nkevents) 202 { 203 uint32_t levents = l_event->events; 204 struct linux_pemuldata *pem; 205 struct proc *p; 206 unsigned short kev_flags = EV_ADD | EV_ENABLE; 207 208 /* flags related to how event is registered */ 209 if ((levents & LINUX_EPOLLONESHOT) != 0) 210 kev_flags |= EV_DISPATCH; 211 if ((levents & LINUX_EPOLLET) != 0) 212 kev_flags |= EV_CLEAR; 213 if ((levents & LINUX_EPOLLERR) != 0) 214 kev_flags |= EV_ERROR; 215 if ((levents & LINUX_EPOLLRDHUP) != 0) 216 kev_flags |= EV_EOF; 217 218 /* flags related to what event is registered */ 219 if ((levents & LINUX_EPOLL_EVRD) != 0) { 220 EV_SET(kevent, fd, EVFILT_READ, kev_flags, 0, 0, 0); 221 kevent->ext[0] = l_event->data; 222 ++kevent; 223 ++(*nkevents); 224 } 225 if ((levents & LINUX_EPOLL_EVWR) != 0) { 226 EV_SET(kevent, fd, EVFILT_WRITE, kev_flags, 0, 0, 0); 227 kevent->ext[0] = l_event->data; 228 ++kevent; 229 ++(*nkevents); 230 } 231 /* zero event mask is legal */ 232 if ((levents & (LINUX_EPOLL_EVRD | LINUX_EPOLL_EVWR)) == 0) { 233 EV_SET(kevent++, fd, EVFILT_READ, EV_ADD|EV_DISABLE, 0, 0, 0); 234 ++(*nkevents); 235 } 236 237 if ((levents & ~(LINUX_EPOLL_EVSUP)) != 0) { 238 p = td->td_proc; 239 240 pem = pem_find(p); 241 KASSERT(pem != NULL, ("epoll proc emuldata not found.\n")); 242 243 LINUX_PEM_XLOCK(pem); 244 if ((pem->flags & LINUX_XUNSUP_EPOLL) == 0) { 245 pem->flags |= LINUX_XUNSUP_EPOLL; 246 LINUX_PEM_XUNLOCK(pem); 247 linux_msg(td, "epoll_ctl unsupported flags: 0x%x", 248 levents); 249 } else 250 LINUX_PEM_XUNLOCK(pem); 251 return (EINVAL); 252 } 253 254 return (0); 255 } 256 257 /* 258 * Structure converting function from kevent to epoll. In a case 259 * this is called on error in registration we store the error in 260 * event->data and pick it up later in linux_epoll_ctl(). 261 */ 262 static void 263 kevent_to_epoll(struct kevent *kevent, struct epoll_event *l_event) 264 { 265 266 l_event->data = kevent->ext[0]; 267 268 if ((kevent->flags & EV_ERROR) != 0) { 269 l_event->events = LINUX_EPOLLERR; 270 return; 271 } 272 273 /* XXX EPOLLPRI, EPOLLHUP */ 274 switch (kevent->filter) { 275 case EVFILT_READ: 276 l_event->events = LINUX_EPOLLIN; 277 if ((kevent->flags & EV_EOF) != 0) 278 l_event->events |= LINUX_EPOLLRDHUP; 279 break; 280 case EVFILT_WRITE: 281 l_event->events = LINUX_EPOLLOUT; 282 break; 283 } 284 } 285 286 /* 287 * Copyout callback used by kevent. This converts kevent 288 * events to epoll events and copies them back to the 289 * userspace. This is also called on error on registering 290 * of the filter. 291 */ 292 static int 293 epoll_kev_copyout(void *arg, struct kevent *kevp, int count) 294 { 295 struct epoll_copyout_args *args; 296 struct epoll_event *eep; 297 int error, i; 298 299 args = (struct epoll_copyout_args*) arg; 300 eep = malloc(sizeof(*eep) * count, M_EPOLL, M_WAITOK | M_ZERO); 301 302 for (i = 0; i < count; i++) 303 kevent_to_epoll(&kevp[i], &eep[i]); 304 305 error = copyout(eep, args->leventlist, count * sizeof(*eep)); 306 if (error == 0) { 307 args->leventlist += count; 308 args->count += count; 309 } else if (args->error == 0) 310 args->error = error; 311 312 free(eep, M_EPOLL); 313 return (error); 314 } 315 316 /* 317 * Copyin callback used by kevent. This copies already 318 * converted filters from kernel memory to the kevent 319 * internal kernel memory. Hence the memcpy instead of 320 * copyin. 321 */ 322 static int 323 epoll_kev_copyin(void *arg, struct kevent *kevp, int count) 324 { 325 struct epoll_copyin_args *args; 326 327 args = (struct epoll_copyin_args*) arg; 328 329 memcpy(kevp, args->changelist, count * sizeof(*kevp)); 330 args->changelist += count; 331 332 return (0); 333 } 334 335 /* 336 * Load epoll filter, convert it to kevent filter 337 * and load it into kevent subsystem. 338 */ 339 int 340 linux_epoll_ctl(struct thread *td, struct linux_epoll_ctl_args *args) 341 { 342 struct file *epfp, *fp; 343 struct epoll_copyin_args ciargs; 344 struct kevent kev[2]; 345 struct kevent_copyops k_ops = { &ciargs, 346 NULL, 347 epoll_kev_copyin}; 348 struct epoll_event le; 349 cap_rights_t rights; 350 int nchanges = 0; 351 int error; 352 353 if (args->op != LINUX_EPOLL_CTL_DEL) { 354 error = copyin(args->event, &le, sizeof(le)); 355 if (error != 0) 356 return (error); 357 } 358 359 error = fget(td, args->epfd, 360 cap_rights_init_one(&rights, CAP_KQUEUE_CHANGE), &epfp); 361 if (error != 0) 362 return (error); 363 if (epfp->f_type != DTYPE_KQUEUE) { 364 error = EINVAL; 365 goto leave1; 366 } 367 368 /* Protect user data vector from incorrectly supplied fd. */ 369 error = fget(td, args->fd, 370 cap_rights_init_one(&rights, CAP_POLL_EVENT), &fp); 371 if (error != 0) 372 goto leave1; 373 374 /* Linux disallows spying on himself */ 375 if (epfp == fp) { 376 error = EINVAL; 377 goto leave0; 378 } 379 380 ciargs.changelist = kev; 381 382 if (args->op != LINUX_EPOLL_CTL_DEL) { 383 error = epoll_to_kevent(td, args->fd, &le, kev, &nchanges); 384 if (error != 0) 385 goto leave0; 386 } 387 388 switch (args->op) { 389 case LINUX_EPOLL_CTL_MOD: 390 error = epoll_delete_all_events(td, epfp, args->fd); 391 if (error != 0) 392 goto leave0; 393 break; 394 395 case LINUX_EPOLL_CTL_ADD: 396 if (epoll_fd_registered(td, epfp, args->fd)) { 397 error = EEXIST; 398 goto leave0; 399 } 400 break; 401 402 case LINUX_EPOLL_CTL_DEL: 403 /* CTL_DEL means unregister this fd with this epoll */ 404 error = epoll_delete_all_events(td, epfp, args->fd); 405 goto leave0; 406 407 default: 408 error = EINVAL; 409 goto leave0; 410 } 411 412 error = kern_kevent_fp(td, epfp, nchanges, 0, &k_ops, NULL); 413 414 leave0: 415 fdrop(fp, td); 416 417 leave1: 418 fdrop(epfp, td); 419 return (error); 420 } 421 422 /* 423 * Wait for a filter to be triggered on the epoll file descriptor. 424 */ 425 static int 426 linux_epoll_wait_common(struct thread *td, int epfd, struct epoll_event *events, 427 int maxevents, int timeout, sigset_t *uset) 428 { 429 struct epoll_copyout_args coargs; 430 struct kevent_copyops k_ops = { &coargs, 431 epoll_kev_copyout, 432 NULL}; 433 struct timespec ts, *tsp; 434 cap_rights_t rights; 435 struct file *epfp; 436 sigset_t omask; 437 int error; 438 439 if (maxevents <= 0 || maxevents > LINUX_MAX_EVENTS) 440 return (EINVAL); 441 442 error = fget(td, epfd, 443 cap_rights_init_one(&rights, CAP_KQUEUE_EVENT), &epfp); 444 if (error != 0) 445 return (error); 446 if (epfp->f_type != DTYPE_KQUEUE) { 447 error = EINVAL; 448 goto leave; 449 } 450 if (uset != NULL) { 451 error = kern_sigprocmask(td, SIG_SETMASK, uset, 452 &omask, 0); 453 if (error != 0) 454 goto leave; 455 td->td_pflags |= TDP_OLDMASK; 456 /* 457 * Make sure that ast() is called on return to 458 * usermode and TDP_OLDMASK is cleared, restoring old 459 * sigmask. 460 */ 461 thread_lock(td); 462 td->td_flags |= TDF_ASTPENDING; 463 thread_unlock(td); 464 } 465 466 coargs.leventlist = events; 467 coargs.p = td->td_proc; 468 coargs.count = 0; 469 coargs.error = 0; 470 471 /* 472 * Linux epoll_wait(2) man page states that timeout of -1 causes caller 473 * to block indefinitely. Real implementation does it if any negative 474 * timeout value is passed. 475 */ 476 if (timeout >= 0) { 477 /* Convert from milliseconds to timespec. */ 478 ts.tv_sec = timeout / 1000; 479 ts.tv_nsec = (timeout % 1000) * 1000000; 480 tsp = &ts; 481 } else { 482 tsp = NULL; 483 } 484 485 error = kern_kevent_fp(td, epfp, 0, maxevents, &k_ops, tsp); 486 if (error == 0 && coargs.error != 0) 487 error = coargs.error; 488 489 /* 490 * kern_kevent might return ENOMEM which is not expected from epoll_wait. 491 * Maybe we should translate that but I don't think it matters at all. 492 */ 493 if (error == 0) 494 td->td_retval[0] = coargs.count; 495 496 if (uset != NULL) 497 error = kern_sigprocmask(td, SIG_SETMASK, &omask, 498 NULL, 0); 499 leave: 500 fdrop(epfp, td); 501 return (error); 502 } 503 504 #ifdef LINUX_LEGACY_SYSCALLS 505 int 506 linux_epoll_wait(struct thread *td, struct linux_epoll_wait_args *args) 507 { 508 509 return (linux_epoll_wait_common(td, args->epfd, args->events, 510 args->maxevents, args->timeout, NULL)); 511 } 512 #endif 513 514 int 515 linux_epoll_pwait(struct thread *td, struct linux_epoll_pwait_args *args) 516 { 517 sigset_t mask, *pmask; 518 l_sigset_t lmask; 519 int error; 520 521 if (args->mask != NULL) { 522 if (args->sigsetsize != sizeof(l_sigset_t)) 523 return (EINVAL); 524 error = copyin(args->mask, &lmask, sizeof(l_sigset_t)); 525 if (error != 0) 526 return (error); 527 linux_to_bsd_sigset(&lmask, &mask); 528 pmask = &mask; 529 } else 530 pmask = NULL; 531 return (linux_epoll_wait_common(td, args->epfd, args->events, 532 args->maxevents, args->timeout, pmask)); 533 } 534 535 static int 536 epoll_register_kevent(struct thread *td, struct file *epfp, int fd, int filter, 537 unsigned int flags) 538 { 539 struct epoll_copyin_args ciargs; 540 struct kevent kev; 541 struct kevent_copyops k_ops = { &ciargs, 542 NULL, 543 epoll_kev_copyin}; 544 545 ciargs.changelist = &kev; 546 EV_SET(&kev, fd, filter, flags, 0, 0, 0); 547 548 return (kern_kevent_fp(td, epfp, 1, 0, &k_ops, NULL)); 549 } 550 551 static int 552 epoll_fd_registered(struct thread *td, struct file *epfp, int fd) 553 { 554 /* 555 * Set empty filter flags to avoid accidental modification of already 556 * registered events. In the case of event re-registration: 557 * 1. If event does not exists kevent() does nothing and returns ENOENT 558 * 2. If event does exists, it's enabled/disabled state is preserved 559 * but fflags, data and udata fields are overwritten. So we can not 560 * set socket lowats and store user's context pointer in udata. 561 */ 562 if (epoll_register_kevent(td, epfp, fd, EVFILT_READ, 0) != ENOENT || 563 epoll_register_kevent(td, epfp, fd, EVFILT_WRITE, 0) != ENOENT) 564 return (1); 565 566 return (0); 567 } 568 569 static int 570 epoll_delete_all_events(struct thread *td, struct file *epfp, int fd) 571 { 572 int error1, error2; 573 574 error1 = epoll_register_kevent(td, epfp, fd, EVFILT_READ, EV_DELETE); 575 error2 = epoll_register_kevent(td, epfp, fd, EVFILT_WRITE, EV_DELETE); 576 577 /* return 0 if at least one result positive */ 578 return (error1 == 0 ? 0 : error2); 579 } 580 581 #ifdef LINUX_LEGACY_SYSCALLS 582 int 583 linux_eventfd(struct thread *td, struct linux_eventfd_args *args) 584 { 585 struct specialfd_eventfd ae; 586 587 bzero(&ae, sizeof(ae)); 588 ae.initval = args->initval; 589 return (kern_specialfd(td, SPECIALFD_EVENTFD, &ae)); 590 } 591 #endif 592 593 int 594 linux_eventfd2(struct thread *td, struct linux_eventfd2_args *args) 595 { 596 struct specialfd_eventfd ae; 597 int flags; 598 599 if ((args->flags & ~(LINUX_O_CLOEXEC | LINUX_O_NONBLOCK | 600 LINUX_EFD_SEMAPHORE)) != 0) 601 return (EINVAL); 602 flags = 0; 603 if ((args->flags & LINUX_O_CLOEXEC) != 0) 604 flags |= EFD_CLOEXEC; 605 if ((args->flags & LINUX_O_NONBLOCK) != 0) 606 flags |= EFD_NONBLOCK; 607 if ((args->flags & LINUX_EFD_SEMAPHORE) != 0) 608 flags |= EFD_SEMAPHORE; 609 610 bzero(&ae, sizeof(ae)); 611 ae.flags = flags; 612 ae.initval = args->initval; 613 return (kern_specialfd(td, SPECIALFD_EVENTFD, &ae)); 614 } 615 616 int 617 linux_timerfd_create(struct thread *td, struct linux_timerfd_create_args *args) 618 { 619 struct filedesc *fdp; 620 struct timerfd *tfd; 621 struct file *fp; 622 clockid_t clockid; 623 int fflags, fd, error; 624 625 if ((args->flags & ~LINUX_TFD_CREATE_FLAGS) != 0) 626 return (EINVAL); 627 628 error = linux_to_native_clockid(&clockid, args->clockid); 629 if (error != 0) 630 return (error); 631 if (clockid != CLOCK_REALTIME && clockid != CLOCK_MONOTONIC) 632 return (EINVAL); 633 634 fflags = 0; 635 if ((args->flags & LINUX_TFD_CLOEXEC) != 0) 636 fflags |= O_CLOEXEC; 637 638 fdp = td->td_proc->p_fd; 639 error = falloc(td, &fp, &fd, fflags); 640 if (error != 0) 641 return (error); 642 643 tfd = malloc(sizeof(*tfd), M_EPOLL, M_WAITOK | M_ZERO); 644 tfd->tfd_clockid = clockid; 645 mtx_init(&tfd->tfd_lock, "timerfd", NULL, MTX_DEF); 646 647 callout_init_mtx(&tfd->tfd_callout, &tfd->tfd_lock, 0); 648 knlist_init_mtx(&tfd->tfd_sel.si_note, &tfd->tfd_lock); 649 650 fflags = FREAD; 651 if ((args->flags & LINUX_O_NONBLOCK) != 0) 652 fflags |= FNONBLOCK; 653 654 finit(fp, fflags, DTYPE_LINUXTFD, tfd, &timerfdops); 655 fdrop(fp, td); 656 657 td->td_retval[0] = fd; 658 return (error); 659 } 660 661 static int 662 timerfd_close(struct file *fp, struct thread *td) 663 { 664 struct timerfd *tfd; 665 666 tfd = fp->f_data; 667 if (fp->f_type != DTYPE_LINUXTFD || tfd == NULL) 668 return (EINVAL); 669 670 timespecclear(&tfd->tfd_time.it_value); 671 timespecclear(&tfd->tfd_time.it_interval); 672 673 callout_drain(&tfd->tfd_callout); 674 675 seldrain(&tfd->tfd_sel); 676 knlist_destroy(&tfd->tfd_sel.si_note); 677 678 fp->f_ops = &badfileops; 679 mtx_destroy(&tfd->tfd_lock); 680 free(tfd, M_EPOLL); 681 682 return (0); 683 } 684 685 static int 686 timerfd_read(struct file *fp, struct uio *uio, struct ucred *active_cred, 687 int flags, struct thread *td) 688 { 689 struct timerfd *tfd; 690 timerfd_t count; 691 int error; 692 693 tfd = fp->f_data; 694 if (fp->f_type != DTYPE_LINUXTFD || tfd == NULL) 695 return (EINVAL); 696 697 if (uio->uio_resid < sizeof(timerfd_t)) 698 return (EINVAL); 699 700 error = 0; 701 mtx_lock(&tfd->tfd_lock); 702 retry: 703 if (tfd->tfd_canceled) { 704 tfd->tfd_count = 0; 705 mtx_unlock(&tfd->tfd_lock); 706 return (ECANCELED); 707 } 708 if (tfd->tfd_count == 0) { 709 if ((fp->f_flag & FNONBLOCK) != 0) { 710 mtx_unlock(&tfd->tfd_lock); 711 return (EAGAIN); 712 } 713 error = mtx_sleep(&tfd->tfd_count, &tfd->tfd_lock, PCATCH, "ltfdrd", 0); 714 if (error == 0) 715 goto retry; 716 } 717 if (error == 0) { 718 count = tfd->tfd_count; 719 tfd->tfd_count = 0; 720 mtx_unlock(&tfd->tfd_lock); 721 error = uiomove(&count, sizeof(timerfd_t), uio); 722 } else 723 mtx_unlock(&tfd->tfd_lock); 724 725 return (error); 726 } 727 728 static int 729 timerfd_poll(struct file *fp, int events, struct ucred *active_cred, 730 struct thread *td) 731 { 732 struct timerfd *tfd; 733 int revents = 0; 734 735 tfd = fp->f_data; 736 if (fp->f_type != DTYPE_LINUXTFD || tfd == NULL) 737 return (POLLERR); 738 739 mtx_lock(&tfd->tfd_lock); 740 if ((events & (POLLIN|POLLRDNORM)) && tfd->tfd_count > 0) 741 revents |= events & (POLLIN|POLLRDNORM); 742 if (revents == 0) 743 selrecord(td, &tfd->tfd_sel); 744 mtx_unlock(&tfd->tfd_lock); 745 746 return (revents); 747 } 748 749 static int 750 timerfd_kqfilter(struct file *fp, struct knote *kn) 751 { 752 struct timerfd *tfd; 753 754 tfd = fp->f_data; 755 if (fp->f_type != DTYPE_LINUXTFD || tfd == NULL) 756 return (EINVAL); 757 758 if (kn->kn_filter == EVFILT_READ) 759 kn->kn_fop = &timerfd_rfiltops; 760 else 761 return (EINVAL); 762 763 kn->kn_hook = tfd; 764 knlist_add(&tfd->tfd_sel.si_note, kn, 0); 765 766 return (0); 767 } 768 769 static void 770 filt_timerfddetach(struct knote *kn) 771 { 772 struct timerfd *tfd = kn->kn_hook; 773 774 mtx_lock(&tfd->tfd_lock); 775 knlist_remove(&tfd->tfd_sel.si_note, kn, 1); 776 mtx_unlock(&tfd->tfd_lock); 777 } 778 779 static int 780 filt_timerfdread(struct knote *kn, long hint) 781 { 782 struct timerfd *tfd = kn->kn_hook; 783 784 return (tfd->tfd_count > 0); 785 } 786 787 static int 788 timerfd_ioctl(struct file *fp, u_long cmd, void *data, 789 struct ucred *active_cred, struct thread *td) 790 { 791 792 if (fp->f_data == NULL || fp->f_type != DTYPE_LINUXTFD) 793 return (EINVAL); 794 795 switch (cmd) { 796 case FIONBIO: 797 case FIOASYNC: 798 return (0); 799 } 800 801 return (ENOTTY); 802 } 803 804 static int 805 timerfd_stat(struct file *fp, struct stat *st, struct ucred *active_cred, 806 struct thread *td) 807 { 808 809 return (ENXIO); 810 } 811 812 static int 813 timerfd_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) 814 { 815 816 kif->kf_type = KF_TYPE_UNKNOWN; 817 return (0); 818 } 819 820 static void 821 linux_timerfd_clocktime(struct timerfd *tfd, struct timespec *ts) 822 { 823 824 if (tfd->tfd_clockid == CLOCK_REALTIME) 825 getnanotime(ts); 826 else /* CLOCK_MONOTONIC */ 827 getnanouptime(ts); 828 } 829 830 static void 831 linux_timerfd_curval(struct timerfd *tfd, struct itimerspec *ots) 832 { 833 struct timespec cts; 834 835 linux_timerfd_clocktime(tfd, &cts); 836 *ots = tfd->tfd_time; 837 if (ots->it_value.tv_sec != 0 || ots->it_value.tv_nsec != 0) { 838 timespecsub(&ots->it_value, &cts, &ots->it_value); 839 if (ots->it_value.tv_sec < 0 || 840 (ots->it_value.tv_sec == 0 && 841 ots->it_value.tv_nsec == 0)) { 842 ots->it_value.tv_sec = 0; 843 ots->it_value.tv_nsec = 1; 844 } 845 } 846 } 847 848 int 849 linux_timerfd_gettime(struct thread *td, struct linux_timerfd_gettime_args *args) 850 { 851 struct l_itimerspec lots; 852 struct itimerspec ots; 853 struct timerfd *tfd; 854 struct file *fp; 855 int error; 856 857 error = fget(td, args->fd, &cap_read_rights, &fp); 858 if (error != 0) 859 return (error); 860 tfd = fp->f_data; 861 if (fp->f_type != DTYPE_LINUXTFD || tfd == NULL) { 862 error = EINVAL; 863 goto out; 864 } 865 866 mtx_lock(&tfd->tfd_lock); 867 linux_timerfd_curval(tfd, &ots); 868 mtx_unlock(&tfd->tfd_lock); 869 870 error = native_to_linux_itimerspec(&lots, &ots); 871 if (error == 0) 872 error = copyout(&lots, args->old_value, sizeof(lots)); 873 874 out: 875 fdrop(fp, td); 876 return (error); 877 } 878 879 int 880 linux_timerfd_settime(struct thread *td, struct linux_timerfd_settime_args *args) 881 { 882 struct l_itimerspec lots; 883 struct itimerspec nts, ots; 884 struct timespec cts, ts; 885 struct timerfd *tfd; 886 struct timeval tv; 887 struct file *fp; 888 int error; 889 890 if ((args->flags & ~LINUX_TFD_SETTIME_FLAGS) != 0) 891 return (EINVAL); 892 893 error = copyin(args->new_value, &lots, sizeof(lots)); 894 if (error != 0) 895 return (error); 896 error = linux_to_native_itimerspec(&nts, &lots); 897 if (error != 0) 898 return (error); 899 900 error = fget(td, args->fd, &cap_write_rights, &fp); 901 if (error != 0) 902 return (error); 903 tfd = fp->f_data; 904 if (fp->f_type != DTYPE_LINUXTFD || tfd == NULL) { 905 error = EINVAL; 906 goto out; 907 } 908 909 mtx_lock(&tfd->tfd_lock); 910 if (!timespecisset(&nts.it_value)) 911 timespecclear(&nts.it_interval); 912 if (args->old_value != NULL) 913 linux_timerfd_curval(tfd, &ots); 914 915 tfd->tfd_time = nts; 916 tfd->tfd_count = 0; 917 if (timespecisset(&nts.it_value)) { 918 linux_timerfd_clocktime(tfd, &cts); 919 ts = nts.it_value; 920 if ((args->flags & LINUX_TFD_TIMER_ABSTIME) == 0) { 921 timespecadd(&tfd->tfd_time.it_value, &cts, 922 &tfd->tfd_time.it_value); 923 } else { 924 timespecsub(&ts, &cts, &ts); 925 } 926 TIMESPEC_TO_TIMEVAL(&tv, &ts); 927 callout_reset(&tfd->tfd_callout, tvtohz(&tv), 928 linux_timerfd_expire, tfd); 929 tfd->tfd_canceled = false; 930 } else { 931 tfd->tfd_canceled = true; 932 callout_stop(&tfd->tfd_callout); 933 } 934 mtx_unlock(&tfd->tfd_lock); 935 936 if (args->old_value != NULL) { 937 error = native_to_linux_itimerspec(&lots, &ots); 938 if (error == 0) 939 error = copyout(&lots, args->old_value, sizeof(lots)); 940 } 941 942 out: 943 fdrop(fp, td); 944 return (error); 945 } 946 947 static void 948 linux_timerfd_expire(void *arg) 949 { 950 struct timespec cts, ts; 951 struct timeval tv; 952 struct timerfd *tfd; 953 954 tfd = (struct timerfd *)arg; 955 956 linux_timerfd_clocktime(tfd, &cts); 957 if (timespeccmp(&cts, &tfd->tfd_time.it_value, >=)) { 958 if (timespecisset(&tfd->tfd_time.it_interval)) 959 timespecadd(&tfd->tfd_time.it_value, 960 &tfd->tfd_time.it_interval, 961 &tfd->tfd_time.it_value); 962 else 963 /* single shot timer */ 964 timespecclear(&tfd->tfd_time.it_value); 965 if (timespecisset(&tfd->tfd_time.it_value)) { 966 timespecsub(&tfd->tfd_time.it_value, &cts, &ts); 967 TIMESPEC_TO_TIMEVAL(&tv, &ts); 968 callout_reset(&tfd->tfd_callout, tvtohz(&tv), 969 linux_timerfd_expire, tfd); 970 } 971 tfd->tfd_count++; 972 KNOTE_LOCKED(&tfd->tfd_sel.si_note, 0); 973 selwakeup(&tfd->tfd_sel); 974 wakeup(&tfd->tfd_count); 975 } else if (timespecisset(&tfd->tfd_time.it_value)) { 976 timespecsub(&tfd->tfd_time.it_value, &cts, &ts); 977 TIMESPEC_TO_TIMEVAL(&tv, &ts); 978 callout_reset(&tfd->tfd_callout, tvtohz(&tv), 979 linux_timerfd_expire, tfd); 980 } 981 } 982