1290001Sglebius/* $OpenBSD: kqueue.c,v 1.5 2002/07/10 14:41:31 art Exp $ */ 2290001Sglebius 3290001Sglebius/* 4290001Sglebius * Copyright 2000-2007 Niels Provos <provos@citi.umich.edu> 5290001Sglebius * Copyright 2007-2012 Niels Provos and Nick Mathewson 6290001Sglebius * 7290001Sglebius * Redistribution and use in source and binary forms, with or without 8290001Sglebius * modification, are permitted provided that the following conditions 9290001Sglebius * are met: 10290001Sglebius * 1. Redistributions of source code must retain the above copyright 11290001Sglebius * notice, this list of conditions and the following disclaimer. 12290001Sglebius * 2. Redistributions in binary form must reproduce the above copyright 13290001Sglebius * notice, this list of conditions and the following disclaimer in the 14290001Sglebius * documentation and/or other materials provided with the distribution. 15290001Sglebius * 3. The name of the author may not be used to endorse or promote products 16290001Sglebius * derived from this software without specific prior written permission. 17290001Sglebius * 18290001Sglebius * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19290001Sglebius * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20290001Sglebius * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21290001Sglebius * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22290001Sglebius * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23290001Sglebius * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24290001Sglebius * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25290001Sglebius * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26290001Sglebius * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27290001Sglebius * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28290001Sglebius */ 29290001Sglebius#include "event2/event-config.h" 30290001Sglebius#include "evconfig-private.h" 31290001Sglebius 32290001Sglebius#ifdef EVENT__HAVE_KQUEUE 33290001Sglebius 34290001Sglebius#include <sys/types.h> 35290001Sglebius#ifdef EVENT__HAVE_SYS_TIME_H 36290001Sglebius#include <sys/time.h> 37290001Sglebius#endif 38290001Sglebius#include <sys/queue.h> 39290001Sglebius#include <sys/event.h> 40290001Sglebius#include <signal.h> 41290001Sglebius#include <stdio.h> 42290001Sglebius#include <stdlib.h> 43290001Sglebius#include <string.h> 44290001Sglebius#include <unistd.h> 45290001Sglebius#include <errno.h> 46290001Sglebius#ifdef EVENT__HAVE_INTTYPES_H 47290001Sglebius#include <inttypes.h> 48290001Sglebius#endif 49290001Sglebius 50290001Sglebius/* Some platforms apparently define the udata field of struct kevent as 51290001Sglebius * intptr_t, whereas others define it as void*. There doesn't seem to be an 52290001Sglebius * easy way to tell them apart via autoconf, so we need to use OS macros. */ 53290001Sglebius#if defined(EVENT__HAVE_INTTYPES_H) && !defined(__OpenBSD__) && !defined(__FreeBSD__) && !defined(__darwin__) && !defined(__APPLE__) 54290001Sglebius#define PTR_TO_UDATA(x) ((intptr_t)(x)) 55290001Sglebius#define INT_TO_UDATA(x) ((intptr_t)(x)) 56290001Sglebius#else 57290001Sglebius#define PTR_TO_UDATA(x) (x) 58290001Sglebius#define INT_TO_UDATA(x) ((void*)(x)) 59290001Sglebius#endif 60290001Sglebius 61290001Sglebius#include "event-internal.h" 62290001Sglebius#include "log-internal.h" 63290001Sglebius#include "evmap-internal.h" 64290001Sglebius#include "event2/thread.h" 65290001Sglebius#include "evthread-internal.h" 66290001Sglebius#include "changelist-internal.h" 67290001Sglebius 68290001Sglebius#include "kqueue-internal.h" 69290001Sglebius 70290001Sglebius#define NEVENT 64 71290001Sglebius 72290001Sglebiusstruct kqop { 73290001Sglebius struct kevent *changes; 74290001Sglebius int changes_size; 75290001Sglebius 76290001Sglebius struct kevent *events; 77290001Sglebius int events_size; 78290001Sglebius int kq; 79290001Sglebius int notify_event_added; 80290001Sglebius pid_t pid; 81290001Sglebius}; 82290001Sglebius 83290001Sglebiusstatic void kqop_free(struct kqop *kqop); 84290001Sglebius 85290001Sglebiusstatic void *kq_init(struct event_base *); 86290001Sglebiusstatic int kq_sig_add(struct event_base *, int, short, short, void *); 87290001Sglebiusstatic int kq_sig_del(struct event_base *, int, short, short, void *); 88290001Sglebiusstatic int kq_dispatch(struct event_base *, struct timeval *); 89290001Sglebiusstatic void kq_dealloc(struct event_base *); 90290001Sglebius 91290001Sglebiusconst struct eventop kqops = { 92290001Sglebius "kqueue", 93290001Sglebius kq_init, 94290001Sglebius event_changelist_add_, 95290001Sglebius event_changelist_del_, 96290001Sglebius kq_dispatch, 97290001Sglebius kq_dealloc, 98290001Sglebius 1 /* need reinit */, 99290001Sglebius EV_FEATURE_ET|EV_FEATURE_O1|EV_FEATURE_FDS, 100290001Sglebius EVENT_CHANGELIST_FDINFO_SIZE 101290001Sglebius}; 102290001Sglebius 103290001Sglebiusstatic const struct eventop kqsigops = { 104290001Sglebius "kqueue_signal", 105290001Sglebius NULL, 106290001Sglebius kq_sig_add, 107290001Sglebius kq_sig_del, 108290001Sglebius NULL, 109290001Sglebius NULL, 110290001Sglebius 1 /* need reinit */, 111290001Sglebius 0, 112290001Sglebius 0 113290001Sglebius}; 114290001Sglebius 115290001Sglebiusstatic void * 116290001Sglebiuskq_init(struct event_base *base) 117290001Sglebius{ 118290001Sglebius int kq = -1; 119290001Sglebius struct kqop *kqueueop = NULL; 120290001Sglebius 121290001Sglebius if (!(kqueueop = mm_calloc(1, sizeof(struct kqop)))) 122290001Sglebius return (NULL); 123290001Sglebius 124290001Sglebius/* Initialize the kernel queue */ 125290001Sglebius 126290001Sglebius if ((kq = kqueue()) == -1) { 127290001Sglebius event_warn("kqueue"); 128290001Sglebius goto err; 129290001Sglebius } 130290001Sglebius 131290001Sglebius kqueueop->kq = kq; 132290001Sglebius 133290001Sglebius kqueueop->pid = getpid(); 134290001Sglebius 135290001Sglebius /* Initialize fields */ 136290001Sglebius kqueueop->changes = mm_calloc(NEVENT, sizeof(struct kevent)); 137290001Sglebius if (kqueueop->changes == NULL) 138290001Sglebius goto err; 139290001Sglebius kqueueop->events = mm_calloc(NEVENT, sizeof(struct kevent)); 140290001Sglebius if (kqueueop->events == NULL) 141290001Sglebius goto err; 142290001Sglebius kqueueop->events_size = kqueueop->changes_size = NEVENT; 143290001Sglebius 144290001Sglebius /* Check for Mac OS X kqueue bug. */ 145290001Sglebius memset(&kqueueop->changes[0], 0, sizeof kqueueop->changes[0]); 146290001Sglebius kqueueop->changes[0].ident = -1; 147290001Sglebius kqueueop->changes[0].filter = EVFILT_READ; 148290001Sglebius kqueueop->changes[0].flags = EV_ADD; 149290001Sglebius /* 150290001Sglebius * If kqueue works, then kevent will succeed, and it will 151290001Sglebius * stick an error in events[0]. If kqueue is broken, then 152290001Sglebius * kevent will fail. 153290001Sglebius */ 154290001Sglebius if (kevent(kq, 155290001Sglebius kqueueop->changes, 1, kqueueop->events, NEVENT, NULL) != 1 || 156290001Sglebius (int)kqueueop->events[0].ident != -1 || 157290001Sglebius kqueueop->events[0].flags != EV_ERROR) { 158290001Sglebius event_warn("%s: detected broken kqueue; not using.", __func__); 159290001Sglebius goto err; 160290001Sglebius } 161290001Sglebius 162290001Sglebius base->evsigsel = &kqsigops; 163290001Sglebius 164290001Sglebius return (kqueueop); 165290001Sglebiuserr: 166290001Sglebius if (kqueueop) 167290001Sglebius kqop_free(kqueueop); 168290001Sglebius 169290001Sglebius return (NULL); 170290001Sglebius} 171290001Sglebius 172290001Sglebius#define ADD_UDATA 0x30303 173290001Sglebius 174290001Sglebiusstatic void 175290001Sglebiuskq_setup_kevent(struct kevent *out, evutil_socket_t fd, int filter, short change) 176290001Sglebius{ 177290001Sglebius memset(out, 0, sizeof(struct kevent)); 178290001Sglebius out->ident = fd; 179290001Sglebius out->filter = filter; 180290001Sglebius 181290001Sglebius if (change & EV_CHANGE_ADD) { 182290001Sglebius out->flags = EV_ADD; 183290001Sglebius /* We set a magic number here so that we can tell 'add' 184290001Sglebius * errors from 'del' errors. */ 185290001Sglebius out->udata = INT_TO_UDATA(ADD_UDATA); 186290001Sglebius if (change & EV_ET) 187290001Sglebius out->flags |= EV_CLEAR; 188290001Sglebius#ifdef NOTE_EOF 189290001Sglebius /* Make it behave like select() and poll() */ 190290001Sglebius if (filter == EVFILT_READ) 191290001Sglebius out->fflags = NOTE_EOF; 192290001Sglebius#endif 193290001Sglebius } else { 194290001Sglebius EVUTIL_ASSERT(change & EV_CHANGE_DEL); 195290001Sglebius out->flags = EV_DELETE; 196290001Sglebius } 197290001Sglebius} 198290001Sglebius 199290001Sglebiusstatic int 200290001Sglebiuskq_build_changes_list(const struct event_changelist *changelist, 201290001Sglebius struct kqop *kqop) 202290001Sglebius{ 203290001Sglebius int i; 204290001Sglebius int n_changes = 0; 205290001Sglebius 206290001Sglebius for (i = 0; i < changelist->n_changes; ++i) { 207290001Sglebius struct event_change *in_ch = &changelist->changes[i]; 208290001Sglebius struct kevent *out_ch; 209290001Sglebius if (n_changes >= kqop->changes_size - 1) { 210290001Sglebius int newsize = kqop->changes_size * 2; 211290001Sglebius struct kevent *newchanges; 212290001Sglebius 213290001Sglebius newchanges = mm_realloc(kqop->changes, 214290001Sglebius newsize * sizeof(struct kevent)); 215290001Sglebius if (newchanges == NULL) { 216290001Sglebius event_warn("%s: realloc", __func__); 217290001Sglebius return (-1); 218290001Sglebius } 219290001Sglebius kqop->changes = newchanges; 220290001Sglebius kqop->changes_size = newsize; 221290001Sglebius } 222290001Sglebius if (in_ch->read_change) { 223290001Sglebius out_ch = &kqop->changes[n_changes++]; 224290001Sglebius kq_setup_kevent(out_ch, in_ch->fd, EVFILT_READ, 225290001Sglebius in_ch->read_change); 226290001Sglebius } 227290001Sglebius if (in_ch->write_change) { 228290001Sglebius out_ch = &kqop->changes[n_changes++]; 229290001Sglebius kq_setup_kevent(out_ch, in_ch->fd, EVFILT_WRITE, 230290001Sglebius in_ch->write_change); 231290001Sglebius } 232290001Sglebius } 233290001Sglebius return n_changes; 234290001Sglebius} 235290001Sglebius 236290001Sglebiusstatic int 237290001Sglebiuskq_grow_events(struct kqop *kqop, size_t new_size) 238290001Sglebius{ 239290001Sglebius struct kevent *newresult; 240290001Sglebius 241290001Sglebius newresult = mm_realloc(kqop->events, 242290001Sglebius new_size * sizeof(struct kevent)); 243290001Sglebius 244290001Sglebius if (newresult) { 245290001Sglebius kqop->events = newresult; 246290001Sglebius kqop->events_size = new_size; 247290001Sglebius return 0; 248290001Sglebius } else { 249290001Sglebius return -1; 250290001Sglebius } 251290001Sglebius} 252290001Sglebius 253290001Sglebiusstatic int 254290001Sglebiuskq_dispatch(struct event_base *base, struct timeval *tv) 255290001Sglebius{ 256290001Sglebius struct kqop *kqop = base->evbase; 257290001Sglebius struct kevent *events = kqop->events; 258290001Sglebius struct kevent *changes; 259290001Sglebius struct timespec ts, *ts_p = NULL; 260290001Sglebius int i, n_changes, res; 261290001Sglebius 262290001Sglebius if (tv != NULL) { 263290001Sglebius TIMEVAL_TO_TIMESPEC(tv, &ts); 264290001Sglebius ts_p = &ts; 265290001Sglebius } 266290001Sglebius 267290001Sglebius /* Build "changes" from "base->changes" */ 268290001Sglebius EVUTIL_ASSERT(kqop->changes); 269290001Sglebius n_changes = kq_build_changes_list(&base->changelist, kqop); 270290001Sglebius if (n_changes < 0) 271290001Sglebius return -1; 272290001Sglebius 273290001Sglebius event_changelist_remove_all_(&base->changelist, base); 274290001Sglebius 275290001Sglebius /* steal the changes array in case some broken code tries to call 276290001Sglebius * dispatch twice at once. */ 277290001Sglebius changes = kqop->changes; 278290001Sglebius kqop->changes = NULL; 279290001Sglebius 280290001Sglebius /* Make sure that 'events' is at least as long as the list of changes: 281290001Sglebius * otherwise errors in the changes can get reported as a -1 return 282290001Sglebius * value from kevent() rather than as EV_ERROR events in the events 283290001Sglebius * array. 284290001Sglebius * 285290001Sglebius * (We could instead handle -1 return values from kevent() by 286290001Sglebius * retrying with a smaller changes array or a larger events array, 287290001Sglebius * but this approach seems less risky for now.) 288290001Sglebius */ 289290001Sglebius if (kqop->events_size < n_changes) { 290290001Sglebius int new_size = kqop->events_size; 291290001Sglebius do { 292290001Sglebius new_size *= 2; 293290001Sglebius } while (new_size < n_changes); 294290001Sglebius 295290001Sglebius kq_grow_events(kqop, new_size); 296290001Sglebius events = kqop->events; 297290001Sglebius } 298290001Sglebius 299290001Sglebius EVBASE_RELEASE_LOCK(base, th_base_lock); 300290001Sglebius 301290001Sglebius res = kevent(kqop->kq, changes, n_changes, 302290001Sglebius events, kqop->events_size, ts_p); 303290001Sglebius 304290001Sglebius EVBASE_ACQUIRE_LOCK(base, th_base_lock); 305290001Sglebius 306290001Sglebius EVUTIL_ASSERT(kqop->changes == NULL); 307290001Sglebius kqop->changes = changes; 308290001Sglebius 309290001Sglebius if (res == -1) { 310290001Sglebius if (errno != EINTR) { 311290001Sglebius event_warn("kevent"); 312290001Sglebius return (-1); 313290001Sglebius } 314290001Sglebius 315290001Sglebius return (0); 316290001Sglebius } 317290001Sglebius 318290001Sglebius event_debug(("%s: kevent reports %d", __func__, res)); 319290001Sglebius 320290001Sglebius for (i = 0; i < res; i++) { 321290001Sglebius int which = 0; 322290001Sglebius 323290001Sglebius if (events[i].flags & EV_ERROR) { 324290001Sglebius switch (events[i].data) { 325290001Sglebius 326290001Sglebius /* Can occur on delete if we are not currently 327290001Sglebius * watching any events on this fd. That can 328290001Sglebius * happen when the fd was closed and another 329290001Sglebius * file was opened with that fd. */ 330290001Sglebius case ENOENT: 331290001Sglebius /* Can occur for reasons not fully understood 332290001Sglebius * on FreeBSD. */ 333290001Sglebius case EINVAL: 334290001Sglebius continue; 335290001Sglebius#if defined(__FreeBSD__) && defined(ENOTCAPABLE) 336290001Sglebius /* 337290001Sglebius * This currently occurs if an FD is closed 338290001Sglebius * before the EV_DELETE makes it out via kevent(). 339290001Sglebius * The FreeBSD capabilities code sees the blank 340290001Sglebius * capability set and rejects the request to 341290001Sglebius * modify an event. 342290001Sglebius * 343290001Sglebius * To be strictly correct - when an FD is closed, 344290001Sglebius * all the registered events are also removed. 345290001Sglebius * Queuing EV_DELETE to a closed FD is wrong. 346290001Sglebius * The event(s) should just be deleted from 347290001Sglebius * the pending changelist. 348290001Sglebius */ 349290001Sglebius case ENOTCAPABLE: 350290001Sglebius continue; 351290001Sglebius#endif 352290001Sglebius 353290001Sglebius /* Can occur on a delete if the fd is closed. */ 354290001Sglebius case EBADF: 355290001Sglebius /* XXXX On NetBSD, we can also get EBADF if we 356290001Sglebius * try to add the write side of a pipe, but 357290001Sglebius * the read side has already been closed. 358290001Sglebius * Other BSDs call this situation 'EPIPE'. It 359290001Sglebius * would be good if we had a way to report 360290001Sglebius * this situation. */ 361290001Sglebius continue; 362290001Sglebius /* These two can occur on an add if the fd was one side 363290001Sglebius * of a pipe, and the other side was closed. */ 364290001Sglebius case EPERM: 365290001Sglebius case EPIPE: 366290001Sglebius /* Report read events, if we're listening for 367290001Sglebius * them, so that the user can learn about any 368290001Sglebius * add errors. (If the operation was a 369290001Sglebius * delete, then udata should be cleared.) */ 370290001Sglebius if (events[i].udata) { 371290001Sglebius /* The operation was an add: 372290001Sglebius * report the error as a read. */ 373290001Sglebius which |= EV_READ; 374290001Sglebius break; 375290001Sglebius } else { 376290001Sglebius /* The operation was a del: 377290001Sglebius * report nothing. */ 378290001Sglebius continue; 379290001Sglebius } 380290001Sglebius 381290001Sglebius /* Other errors shouldn't occur. */ 382290001Sglebius default: 383290001Sglebius errno = events[i].data; 384290001Sglebius return (-1); 385290001Sglebius } 386290001Sglebius } else if (events[i].filter == EVFILT_READ) { 387290001Sglebius which |= EV_READ; 388290001Sglebius } else if (events[i].filter == EVFILT_WRITE) { 389290001Sglebius which |= EV_WRITE; 390290001Sglebius } else if (events[i].filter == EVFILT_SIGNAL) { 391290001Sglebius which |= EV_SIGNAL; 392290001Sglebius#ifdef EVFILT_USER 393290001Sglebius } else if (events[i].filter == EVFILT_USER) { 394290001Sglebius base->is_notify_pending = 0; 395290001Sglebius#endif 396290001Sglebius } 397290001Sglebius 398290001Sglebius if (!which) 399290001Sglebius continue; 400290001Sglebius 401290001Sglebius if (events[i].filter == EVFILT_SIGNAL) { 402290001Sglebius evmap_signal_active_(base, events[i].ident, 1); 403290001Sglebius } else { 404290001Sglebius evmap_io_active_(base, events[i].ident, which | EV_ET); 405290001Sglebius } 406290001Sglebius } 407290001Sglebius 408290001Sglebius if (res == kqop->events_size) { 409290001Sglebius /* We used all the events space that we have. Maybe we should 410290001Sglebius make it bigger. */ 411290001Sglebius kq_grow_events(kqop, kqop->events_size * 2); 412290001Sglebius } 413290001Sglebius 414290001Sglebius return (0); 415290001Sglebius} 416290001Sglebius 417290001Sglebiusstatic void 418290001Sglebiuskqop_free(struct kqop *kqop) 419290001Sglebius{ 420290001Sglebius if (kqop->changes) 421290001Sglebius mm_free(kqop->changes); 422290001Sglebius if (kqop->events) 423290001Sglebius mm_free(kqop->events); 424290001Sglebius if (kqop->kq >= 0 && kqop->pid == getpid()) 425290001Sglebius close(kqop->kq); 426290001Sglebius memset(kqop, 0, sizeof(struct kqop)); 427290001Sglebius mm_free(kqop); 428290001Sglebius} 429290001Sglebius 430290001Sglebiusstatic void 431290001Sglebiuskq_dealloc(struct event_base *base) 432290001Sglebius{ 433290001Sglebius struct kqop *kqop = base->evbase; 434290001Sglebius evsig_dealloc_(base); 435290001Sglebius kqop_free(kqop); 436290001Sglebius} 437290001Sglebius 438290001Sglebius/* signal handling */ 439290001Sglebiusstatic int 440290001Sglebiuskq_sig_add(struct event_base *base, int nsignal, short old, short events, void *p) 441290001Sglebius{ 442290001Sglebius struct kqop *kqop = base->evbase; 443290001Sglebius struct kevent kev; 444290001Sglebius struct timespec timeout = { 0, 0 }; 445290001Sglebius (void)p; 446290001Sglebius 447290001Sglebius EVUTIL_ASSERT(nsignal >= 0 && nsignal < NSIG); 448290001Sglebius 449290001Sglebius memset(&kev, 0, sizeof(kev)); 450290001Sglebius kev.ident = nsignal; 451290001Sglebius kev.filter = EVFILT_SIGNAL; 452290001Sglebius kev.flags = EV_ADD; 453290001Sglebius 454290001Sglebius /* Be ready for the signal if it is sent any 455290001Sglebius * time between now and the next call to 456290001Sglebius * kq_dispatch. */ 457290001Sglebius if (kevent(kqop->kq, &kev, 1, NULL, 0, &timeout) == -1) 458290001Sglebius return (-1); 459290001Sglebius 460290001Sglebius /* We can set the handler for most signals to SIG_IGN and 461290001Sglebius * still have them reported to us in the queue. However, 462290001Sglebius * if the handler for SIGCHLD is SIG_IGN, the system reaps 463290001Sglebius * zombie processes for us, and we don't get any notification. 464290001Sglebius * This appears to be the only signal with this quirk. */ 465290001Sglebius if (evsig_set_handler_(base, nsignal, 466290001Sglebius nsignal == SIGCHLD ? SIG_DFL : SIG_IGN) == -1) 467290001Sglebius return (-1); 468290001Sglebius 469290001Sglebius return (0); 470290001Sglebius} 471290001Sglebius 472290001Sglebiusstatic int 473290001Sglebiuskq_sig_del(struct event_base *base, int nsignal, short old, short events, void *p) 474290001Sglebius{ 475290001Sglebius struct kqop *kqop = base->evbase; 476290001Sglebius struct kevent kev; 477290001Sglebius 478290001Sglebius struct timespec timeout = { 0, 0 }; 479290001Sglebius (void)p; 480290001Sglebius 481290001Sglebius EVUTIL_ASSERT(nsignal >= 0 && nsignal < NSIG); 482290001Sglebius 483290001Sglebius memset(&kev, 0, sizeof(kev)); 484290001Sglebius kev.ident = nsignal; 485290001Sglebius kev.filter = EVFILT_SIGNAL; 486290001Sglebius kev.flags = EV_DELETE; 487290001Sglebius 488290001Sglebius /* Because we insert signal events 489290001Sglebius * immediately, we need to delete them 490290001Sglebius * immediately, too */ 491290001Sglebius if (kevent(kqop->kq, &kev, 1, NULL, 0, &timeout) == -1) 492290001Sglebius return (-1); 493290001Sglebius 494290001Sglebius if (evsig_restore_handler_(base, nsignal) == -1) 495290001Sglebius return (-1); 496290001Sglebius 497290001Sglebius return (0); 498290001Sglebius} 499290001Sglebius 500290001Sglebius 501290001Sglebius/* OSX 10.6 and FreeBSD 8.1 add support for EVFILT_USER, which we can use 502290001Sglebius * to wake up the event loop from another thread. */ 503290001Sglebius 504290001Sglebius/* Magic number we use for our filter ID. */ 505290001Sglebius#define NOTIFY_IDENT 42 506290001Sglebius 507290001Sglebiusint 508290001Sglebiusevent_kq_add_notify_event_(struct event_base *base) 509290001Sglebius{ 510290001Sglebius struct kqop *kqop = base->evbase; 511290001Sglebius#if defined(EVFILT_USER) && defined(NOTE_TRIGGER) 512290001Sglebius struct kevent kev; 513290001Sglebius struct timespec timeout = { 0, 0 }; 514290001Sglebius#endif 515290001Sglebius 516290001Sglebius if (kqop->notify_event_added) 517290001Sglebius return 0; 518290001Sglebius 519290001Sglebius#if defined(EVFILT_USER) && defined(NOTE_TRIGGER) 520290001Sglebius memset(&kev, 0, sizeof(kev)); 521290001Sglebius kev.ident = NOTIFY_IDENT; 522290001Sglebius kev.filter = EVFILT_USER; 523290001Sglebius kev.flags = EV_ADD | EV_CLEAR; 524290001Sglebius 525290001Sglebius if (kevent(kqop->kq, &kev, 1, NULL, 0, &timeout) == -1) { 526290001Sglebius event_warn("kevent: adding EVFILT_USER event"); 527290001Sglebius return -1; 528290001Sglebius } 529290001Sglebius 530290001Sglebius kqop->notify_event_added = 1; 531290001Sglebius 532290001Sglebius return 0; 533290001Sglebius#else 534290001Sglebius return -1; 535290001Sglebius#endif 536290001Sglebius} 537290001Sglebius 538290001Sglebiusint 539290001Sglebiusevent_kq_notify_base_(struct event_base *base) 540290001Sglebius{ 541290001Sglebius struct kqop *kqop = base->evbase; 542290001Sglebius#if defined(EVFILT_USER) && defined(NOTE_TRIGGER) 543290001Sglebius struct kevent kev; 544290001Sglebius struct timespec timeout = { 0, 0 }; 545290001Sglebius#endif 546290001Sglebius if (! kqop->notify_event_added) 547290001Sglebius return -1; 548290001Sglebius 549290001Sglebius#if defined(EVFILT_USER) && defined(NOTE_TRIGGER) 550290001Sglebius memset(&kev, 0, sizeof(kev)); 551290001Sglebius kev.ident = NOTIFY_IDENT; 552290001Sglebius kev.filter = EVFILT_USER; 553290001Sglebius kev.fflags = NOTE_TRIGGER; 554290001Sglebius 555290001Sglebius if (kevent(kqop->kq, &kev, 1, NULL, 0, &timeout) == -1) { 556290001Sglebius event_warn("kevent: triggering EVFILT_USER event"); 557290001Sglebius return -1; 558290001Sglebius } 559290001Sglebius 560290001Sglebius return 0; 561290001Sglebius#else 562290001Sglebius return -1; 563290001Sglebius#endif 564290001Sglebius} 565290001Sglebius 566290001Sglebius#endif /* EVENT__HAVE_KQUEUE */ 567