1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2007 Roman Divacky 5 * Copyright (c) 2014 Dmitry Chagin <dchagin@FreeBSD.org> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include "opt_compat.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/imgact.h> 37 #include <sys/kernel.h> 38 #include <sys/limits.h> 39 #include <sys/lock.h> 40 #include <sys/mutex.h> 41 #include <sys/callout.h> 42 #include <sys/capsicum.h> 43 #include <sys/types.h> 44 #include <sys/user.h> 45 #include <sys/file.h> 46 #include <sys/filedesc.h> 47 #include <sys/filio.h> 48 #include <sys/errno.h> 49 #include <sys/event.h> 50 #include <sys/poll.h> 51 #include <sys/proc.h> 52 #include <sys/selinfo.h> 53 #include <sys/specialfd.h> 54 #include <sys/sx.h> 55 #include <sys/syscallsubr.h> 56 #include <sys/timespec.h> 57 #include <sys/eventfd.h> 58 59 #ifdef COMPAT_LINUX32 60 #include <machine/../linux32/linux.h> 61 #include <machine/../linux32/linux32_proto.h> 62 #else 63 #include <machine/../linux/linux.h> 64 #include <machine/../linux/linux_proto.h> 65 #endif 66 67 #include <compat/linux/linux_emul.h> 68 #include <compat/linux/linux_event.h> 69 #include <compat/linux/linux_file.h> 70 #include <compat/linux/linux_signal.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 */ 425 426 static int 427 linux_epoll_wait_ts(struct thread *td, int epfd, struct epoll_event *events, 428 int maxevents, struct timespec *tsp, sigset_t *uset) 429 { 430 struct epoll_copyout_args coargs; 431 struct kevent_copyops k_ops = { &coargs, 432 epoll_kev_copyout, 433 NULL}; 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 ast_sched(td, TDA_SIGSUSPEND); 462 } 463 464 coargs.leventlist = events; 465 coargs.p = td->td_proc; 466 coargs.count = 0; 467 coargs.error = 0; 468 469 error = kern_kevent_fp(td, epfp, 0, maxevents, &k_ops, tsp); 470 if (error == 0 && coargs.error != 0) 471 error = coargs.error; 472 473 /* 474 * kern_kevent might return ENOMEM which is not expected from epoll_wait. 475 * Maybe we should translate that but I don't think it matters at all. 476 */ 477 if (error == 0) 478 td->td_retval[0] = coargs.count; 479 480 if (uset != NULL) 481 error = kern_sigprocmask(td, SIG_SETMASK, &omask, 482 NULL, 0); 483 leave: 484 fdrop(epfp, td); 485 return (error); 486 } 487 488 static int 489 linux_epoll_wait_common(struct thread *td, int epfd, struct epoll_event *events, 490 int maxevents, int timeout, sigset_t *uset) 491 { 492 struct timespec ts, *tsp; 493 494 /* 495 * Linux epoll_wait(2) man page states that timeout of -1 causes caller 496 * to block indefinitely. Real implementation does it if any negative 497 * timeout value is passed. 498 */ 499 if (timeout >= 0) { 500 /* Convert from milliseconds to timespec. */ 501 ts.tv_sec = timeout / 1000; 502 ts.tv_nsec = (timeout % 1000) * 1000000; 503 tsp = &ts; 504 } else { 505 tsp = NULL; 506 } 507 return (linux_epoll_wait_ts(td, epfd, events, maxevents, tsp, uset)); 508 509 } 510 511 #ifdef LINUX_LEGACY_SYSCALLS 512 int 513 linux_epoll_wait(struct thread *td, struct linux_epoll_wait_args *args) 514 { 515 516 return (linux_epoll_wait_common(td, args->epfd, args->events, 517 args->maxevents, args->timeout, NULL)); 518 } 519 #endif 520 521 int 522 linux_epoll_pwait(struct thread *td, struct linux_epoll_pwait_args *args) 523 { 524 sigset_t mask, *pmask; 525 int error; 526 527 error = linux_copyin_sigset(td, args->mask, sizeof(l_sigset_t), 528 &mask, &pmask); 529 if (error != 0) 530 return (error); 531 532 return (linux_epoll_wait_common(td, args->epfd, args->events, 533 args->maxevents, args->timeout, pmask)); 534 } 535 536 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 537 int 538 linux_epoll_pwait2_64(struct thread *td, struct linux_epoll_pwait2_64_args *args) 539 { 540 struct timespec ts, *tsa; 541 sigset_t mask, *pmask; 542 int error; 543 544 error = linux_copyin_sigset(td, args->mask, sizeof(l_sigset_t), 545 &mask, &pmask); 546 if (error != 0) 547 return (error); 548 549 if (args->timeout) { 550 error = linux_get_timespec64(&ts, args->timeout); 551 if (error != 0) 552 return (error); 553 tsa = &ts; 554 } else 555 tsa = NULL; 556 557 return (linux_epoll_wait_ts(td, args->epfd, args->events, 558 args->maxevents, tsa, pmask)); 559 } 560 #else 561 int 562 linux_epoll_pwait2(struct thread *td, struct linux_epoll_pwait2_args *args) 563 { 564 struct timespec ts, *tsa; 565 sigset_t mask, *pmask; 566 int error; 567 568 error = linux_copyin_sigset(td, args->mask, sizeof(l_sigset_t), 569 &mask, &pmask); 570 if (error != 0) 571 return (error); 572 573 if (args->timeout) { 574 error = linux_get_timespec(&ts, args->timeout); 575 if (error != 0) 576 return (error); 577 tsa = &ts; 578 } else 579 tsa = NULL; 580 581 return (linux_epoll_wait_ts(td, args->epfd, args->events, 582 args->maxevents, tsa, pmask)); 583 } 584 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ 585 586 static int 587 epoll_register_kevent(struct thread *td, struct file *epfp, int fd, int filter, 588 unsigned int flags) 589 { 590 struct epoll_copyin_args ciargs; 591 struct kevent kev; 592 struct kevent_copyops k_ops = { &ciargs, 593 NULL, 594 epoll_kev_copyin}; 595 596 ciargs.changelist = &kev; 597 EV_SET(&kev, fd, filter, flags, 0, 0, 0); 598 599 return (kern_kevent_fp(td, epfp, 1, 0, &k_ops, NULL)); 600 } 601 602 static int 603 epoll_fd_registered(struct thread *td, struct file *epfp, int fd) 604 { 605 /* 606 * Set empty filter flags to avoid accidental modification of already 607 * registered events. In the case of event re-registration: 608 * 1. If event does not exists kevent() does nothing and returns ENOENT 609 * 2. If event does exists, it's enabled/disabled state is preserved 610 * but fflags, data and udata fields are overwritten. So we can not 611 * set socket lowats and store user's context pointer in udata. 612 */ 613 if (epoll_register_kevent(td, epfp, fd, EVFILT_READ, 0) != ENOENT || 614 epoll_register_kevent(td, epfp, fd, EVFILT_WRITE, 0) != ENOENT) 615 return (1); 616 617 return (0); 618 } 619 620 static int 621 epoll_delete_all_events(struct thread *td, struct file *epfp, int fd) 622 { 623 int error1, error2; 624 625 error1 = epoll_register_kevent(td, epfp, fd, EVFILT_READ, EV_DELETE); 626 error2 = epoll_register_kevent(td, epfp, fd, EVFILT_WRITE, EV_DELETE); 627 628 /* return 0 if at least one result positive */ 629 return (error1 == 0 ? 0 : error2); 630 } 631 632 #ifdef LINUX_LEGACY_SYSCALLS 633 int 634 linux_eventfd(struct thread *td, struct linux_eventfd_args *args) 635 { 636 struct specialfd_eventfd ae; 637 638 bzero(&ae, sizeof(ae)); 639 ae.initval = args->initval; 640 return (kern_specialfd(td, SPECIALFD_EVENTFD, &ae)); 641 } 642 #endif 643 644 int 645 linux_eventfd2(struct thread *td, struct linux_eventfd2_args *args) 646 { 647 struct specialfd_eventfd ae; 648 int flags; 649 650 if ((args->flags & ~(LINUX_O_CLOEXEC | LINUX_O_NONBLOCK | 651 LINUX_EFD_SEMAPHORE)) != 0) 652 return (EINVAL); 653 flags = 0; 654 if ((args->flags & LINUX_O_CLOEXEC) != 0) 655 flags |= EFD_CLOEXEC; 656 if ((args->flags & LINUX_O_NONBLOCK) != 0) 657 flags |= EFD_NONBLOCK; 658 if ((args->flags & LINUX_EFD_SEMAPHORE) != 0) 659 flags |= EFD_SEMAPHORE; 660 661 bzero(&ae, sizeof(ae)); 662 ae.flags = flags; 663 ae.initval = args->initval; 664 return (kern_specialfd(td, SPECIALFD_EVENTFD, &ae)); 665 } 666 667 int 668 linux_timerfd_create(struct thread *td, struct linux_timerfd_create_args *args) 669 { 670 struct timerfd *tfd; 671 struct file *fp; 672 clockid_t clockid; 673 int fflags, fd, error; 674 675 if ((args->flags & ~LINUX_TFD_CREATE_FLAGS) != 0) 676 return (EINVAL); 677 678 error = linux_to_native_clockid(&clockid, args->clockid); 679 if (error != 0) 680 return (error); 681 if (clockid != CLOCK_REALTIME && clockid != CLOCK_MONOTONIC) 682 return (EINVAL); 683 684 fflags = 0; 685 if ((args->flags & LINUX_TFD_CLOEXEC) != 0) 686 fflags |= O_CLOEXEC; 687 688 error = falloc(td, &fp, &fd, fflags); 689 if (error != 0) 690 return (error); 691 692 tfd = malloc(sizeof(*tfd), M_EPOLL, M_WAITOK | M_ZERO); 693 tfd->tfd_clockid = clockid; 694 mtx_init(&tfd->tfd_lock, "timerfd", NULL, MTX_DEF); 695 696 callout_init_mtx(&tfd->tfd_callout, &tfd->tfd_lock, 0); 697 knlist_init_mtx(&tfd->tfd_sel.si_note, &tfd->tfd_lock); 698 699 fflags = FREAD; 700 if ((args->flags & LINUX_O_NONBLOCK) != 0) 701 fflags |= FNONBLOCK; 702 703 finit(fp, fflags, DTYPE_LINUXTFD, tfd, &timerfdops); 704 fdrop(fp, td); 705 706 td->td_retval[0] = fd; 707 return (error); 708 } 709 710 static int 711 timerfd_close(struct file *fp, struct thread *td) 712 { 713 struct timerfd *tfd; 714 715 tfd = fp->f_data; 716 if (fp->f_type != DTYPE_LINUXTFD || tfd == NULL) 717 return (EINVAL); 718 719 timespecclear(&tfd->tfd_time.it_value); 720 timespecclear(&tfd->tfd_time.it_interval); 721 722 callout_drain(&tfd->tfd_callout); 723 724 seldrain(&tfd->tfd_sel); 725 knlist_destroy(&tfd->tfd_sel.si_note); 726 727 fp->f_ops = &badfileops; 728 mtx_destroy(&tfd->tfd_lock); 729 free(tfd, M_EPOLL); 730 731 return (0); 732 } 733 734 static int 735 timerfd_read(struct file *fp, struct uio *uio, struct ucred *active_cred, 736 int flags, struct thread *td) 737 { 738 struct timerfd *tfd; 739 timerfd_t count; 740 int error; 741 742 tfd = fp->f_data; 743 if (fp->f_type != DTYPE_LINUXTFD || tfd == NULL) 744 return (EINVAL); 745 746 if (uio->uio_resid < sizeof(timerfd_t)) 747 return (EINVAL); 748 749 error = 0; 750 mtx_lock(&tfd->tfd_lock); 751 retry: 752 if (tfd->tfd_canceled) { 753 tfd->tfd_count = 0; 754 mtx_unlock(&tfd->tfd_lock); 755 return (ECANCELED); 756 } 757 if (tfd->tfd_count == 0) { 758 if ((fp->f_flag & FNONBLOCK) != 0) { 759 mtx_unlock(&tfd->tfd_lock); 760 return (EAGAIN); 761 } 762 error = mtx_sleep(&tfd->tfd_count, &tfd->tfd_lock, PCATCH, "ltfdrd", 0); 763 if (error == 0) 764 goto retry; 765 } 766 if (error == 0) { 767 count = tfd->tfd_count; 768 tfd->tfd_count = 0; 769 mtx_unlock(&tfd->tfd_lock); 770 error = uiomove(&count, sizeof(timerfd_t), uio); 771 } else 772 mtx_unlock(&tfd->tfd_lock); 773 774 return (error); 775 } 776 777 static int 778 timerfd_poll(struct file *fp, int events, struct ucred *active_cred, 779 struct thread *td) 780 { 781 struct timerfd *tfd; 782 int revents = 0; 783 784 tfd = fp->f_data; 785 if (fp->f_type != DTYPE_LINUXTFD || tfd == NULL) 786 return (POLLERR); 787 788 mtx_lock(&tfd->tfd_lock); 789 if ((events & (POLLIN|POLLRDNORM)) && tfd->tfd_count > 0) 790 revents |= events & (POLLIN|POLLRDNORM); 791 if (revents == 0) 792 selrecord(td, &tfd->tfd_sel); 793 mtx_unlock(&tfd->tfd_lock); 794 795 return (revents); 796 } 797 798 static int 799 timerfd_kqfilter(struct file *fp, struct knote *kn) 800 { 801 struct timerfd *tfd; 802 803 tfd = fp->f_data; 804 if (fp->f_type != DTYPE_LINUXTFD || tfd == NULL) 805 return (EINVAL); 806 807 if (kn->kn_filter == EVFILT_READ) 808 kn->kn_fop = &timerfd_rfiltops; 809 else 810 return (EINVAL); 811 812 kn->kn_hook = tfd; 813 knlist_add(&tfd->tfd_sel.si_note, kn, 0); 814 815 return (0); 816 } 817 818 static void 819 filt_timerfddetach(struct knote *kn) 820 { 821 struct timerfd *tfd = kn->kn_hook; 822 823 mtx_lock(&tfd->tfd_lock); 824 knlist_remove(&tfd->tfd_sel.si_note, kn, 1); 825 mtx_unlock(&tfd->tfd_lock); 826 } 827 828 static int 829 filt_timerfdread(struct knote *kn, long hint) 830 { 831 struct timerfd *tfd = kn->kn_hook; 832 833 return (tfd->tfd_count > 0); 834 } 835 836 static int 837 timerfd_ioctl(struct file *fp, u_long cmd, void *data, 838 struct ucred *active_cred, struct thread *td) 839 { 840 841 if (fp->f_data == NULL || fp->f_type != DTYPE_LINUXTFD) 842 return (EINVAL); 843 844 switch (cmd) { 845 case FIONBIO: 846 case FIOASYNC: 847 return (0); 848 } 849 850 return (ENOTTY); 851 } 852 853 static int 854 timerfd_stat(struct file *fp, struct stat *st, struct ucred *active_cred) 855 { 856 857 return (ENXIO); 858 } 859 860 static int 861 timerfd_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) 862 { 863 864 kif->kf_type = KF_TYPE_UNKNOWN; 865 return (0); 866 } 867 868 static void 869 linux_timerfd_clocktime(struct timerfd *tfd, struct timespec *ts) 870 { 871 872 if (tfd->tfd_clockid == CLOCK_REALTIME) 873 getnanotime(ts); 874 else /* CLOCK_MONOTONIC */ 875 getnanouptime(ts); 876 } 877 878 static void 879 linux_timerfd_curval(struct timerfd *tfd, struct itimerspec *ots) 880 { 881 struct timespec cts; 882 883 linux_timerfd_clocktime(tfd, &cts); 884 *ots = tfd->tfd_time; 885 if (ots->it_value.tv_sec != 0 || ots->it_value.tv_nsec != 0) { 886 timespecsub(&ots->it_value, &cts, &ots->it_value); 887 if (ots->it_value.tv_sec < 0 || 888 (ots->it_value.tv_sec == 0 && 889 ots->it_value.tv_nsec == 0)) { 890 ots->it_value.tv_sec = 0; 891 ots->it_value.tv_nsec = 1; 892 } 893 } 894 } 895 896 static int 897 linux_timerfd_gettime_common(struct thread *td, int fd, struct itimerspec *ots) 898 { 899 struct timerfd *tfd; 900 struct file *fp; 901 int error; 902 903 error = fget(td, fd, &cap_read_rights, &fp); 904 if (error != 0) 905 return (error); 906 tfd = fp->f_data; 907 if (fp->f_type != DTYPE_LINUXTFD || tfd == NULL) { 908 error = EINVAL; 909 goto out; 910 } 911 912 mtx_lock(&tfd->tfd_lock); 913 linux_timerfd_curval(tfd, ots); 914 mtx_unlock(&tfd->tfd_lock); 915 916 out: 917 fdrop(fp, td); 918 return (error); 919 } 920 921 int 922 linux_timerfd_gettime(struct thread *td, struct linux_timerfd_gettime_args *args) 923 { 924 struct l_itimerspec lots; 925 struct itimerspec ots; 926 int error; 927 928 error = linux_timerfd_gettime_common(td, args->fd, &ots); 929 if (error != 0) 930 return (error); 931 error = native_to_linux_itimerspec(&lots, &ots); 932 if (error == 0) 933 error = copyout(&lots, args->old_value, sizeof(lots)); 934 return (error); 935 } 936 937 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 938 int 939 linux_timerfd_gettime64(struct thread *td, struct linux_timerfd_gettime64_args *args) 940 { 941 struct l_itimerspec64 lots; 942 struct itimerspec ots; 943 int error; 944 945 error = linux_timerfd_gettime_common(td, args->fd, &ots); 946 if (error != 0) 947 return (error); 948 error = native_to_linux_itimerspec64(&lots, &ots); 949 if (error == 0) 950 error = copyout(&lots, args->old_value, sizeof(lots)); 951 return (error); 952 } 953 #endif 954 955 static int 956 linux_timerfd_settime_common(struct thread *td, int fd, int flags, 957 struct itimerspec *nts, struct itimerspec *oval) 958 { 959 struct timespec cts, ts; 960 struct timerfd *tfd; 961 struct timeval tv; 962 struct file *fp; 963 int error; 964 965 if ((flags & ~LINUX_TFD_SETTIME_FLAGS) != 0) 966 return (EINVAL); 967 968 error = fget(td, fd, &cap_write_rights, &fp); 969 if (error != 0) 970 return (error); 971 tfd = fp->f_data; 972 if (fp->f_type != DTYPE_LINUXTFD || tfd == NULL) { 973 error = EINVAL; 974 goto out; 975 } 976 977 mtx_lock(&tfd->tfd_lock); 978 if (!timespecisset(&nts->it_value)) 979 timespecclear(&nts->it_interval); 980 if (oval != NULL) 981 linux_timerfd_curval(tfd, oval); 982 983 bcopy(nts, &tfd->tfd_time, sizeof(*nts)); 984 tfd->tfd_count = 0; 985 if (timespecisset(&nts->it_value)) { 986 linux_timerfd_clocktime(tfd, &cts); 987 ts = nts->it_value; 988 if ((flags & LINUX_TFD_TIMER_ABSTIME) == 0) { 989 timespecadd(&tfd->tfd_time.it_value, &cts, 990 &tfd->tfd_time.it_value); 991 } else { 992 timespecsub(&ts, &cts, &ts); 993 } 994 TIMESPEC_TO_TIMEVAL(&tv, &ts); 995 callout_reset(&tfd->tfd_callout, tvtohz(&tv), 996 linux_timerfd_expire, tfd); 997 tfd->tfd_canceled = false; 998 } else { 999 tfd->tfd_canceled = true; 1000 callout_stop(&tfd->tfd_callout); 1001 } 1002 mtx_unlock(&tfd->tfd_lock); 1003 1004 out: 1005 fdrop(fp, td); 1006 return (error); 1007 } 1008 1009 int 1010 linux_timerfd_settime(struct thread *td, struct linux_timerfd_settime_args *args) 1011 { 1012 struct l_itimerspec lots; 1013 struct itimerspec nts, ots, *pots; 1014 int error; 1015 1016 error = copyin(args->new_value, &lots, sizeof(lots)); 1017 if (error != 0) 1018 return (error); 1019 error = linux_to_native_itimerspec(&nts, &lots); 1020 if (error != 0) 1021 return (error); 1022 pots = (args->old_value != NULL ? &ots : NULL); 1023 error = linux_timerfd_settime_common(td, args->fd, args->flags, 1024 &nts, pots); 1025 if (error == 0 && args->old_value != NULL) { 1026 error = native_to_linux_itimerspec(&lots, &ots); 1027 if (error == 0) 1028 error = copyout(&lots, args->old_value, sizeof(lots)); 1029 } 1030 return (error); 1031 } 1032 1033 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 1034 int 1035 linux_timerfd_settime64(struct thread *td, struct linux_timerfd_settime64_args *args) 1036 { 1037 struct l_itimerspec64 lots; 1038 struct itimerspec nts, ots, *pots; 1039 int error; 1040 1041 error = copyin(args->new_value, &lots, sizeof(lots)); 1042 if (error != 0) 1043 return (error); 1044 error = linux_to_native_itimerspec64(&nts, &lots); 1045 if (error != 0) 1046 return (error); 1047 pots = (args->old_value != NULL ? &ots : NULL); 1048 error = linux_timerfd_settime_common(td, args->fd, args->flags, 1049 &nts, pots); 1050 if (error == 0 && args->old_value != NULL) { 1051 error = native_to_linux_itimerspec64(&lots, &ots); 1052 if (error == 0) 1053 error = copyout(&lots, args->old_value, sizeof(lots)); 1054 } 1055 return (error); 1056 } 1057 #endif 1058 1059 static void 1060 linux_timerfd_expire(void *arg) 1061 { 1062 struct timespec cts, ts; 1063 struct timeval tv; 1064 struct timerfd *tfd; 1065 1066 tfd = (struct timerfd *)arg; 1067 1068 linux_timerfd_clocktime(tfd, &cts); 1069 if (timespeccmp(&cts, &tfd->tfd_time.it_value, >=)) { 1070 if (timespecisset(&tfd->tfd_time.it_interval)) 1071 timespecadd(&tfd->tfd_time.it_value, 1072 &tfd->tfd_time.it_interval, 1073 &tfd->tfd_time.it_value); 1074 else 1075 /* single shot timer */ 1076 timespecclear(&tfd->tfd_time.it_value); 1077 if (timespecisset(&tfd->tfd_time.it_value)) { 1078 timespecsub(&tfd->tfd_time.it_value, &cts, &ts); 1079 TIMESPEC_TO_TIMEVAL(&tv, &ts); 1080 callout_reset(&tfd->tfd_callout, tvtohz(&tv), 1081 linux_timerfd_expire, tfd); 1082 } 1083 tfd->tfd_count++; 1084 KNOTE_LOCKED(&tfd->tfd_sel.si_note, 0); 1085 selwakeup(&tfd->tfd_sel); 1086 wakeup(&tfd->tfd_count); 1087 } else if (timespecisset(&tfd->tfd_time.it_value)) { 1088 timespecsub(&tfd->tfd_time.it_value, &cts, &ts); 1089 TIMESPEC_TO_TIMEVAL(&tv, &ts); 1090 callout_reset(&tfd->tfd_callout, tvtohz(&tv), 1091 linux_timerfd_expire, tfd); 1092 } 1093 } 1094