Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 1 | /* $OpenBSD: kqueue.c,v 1.5 2002/07/10 14:41:31 art Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright 2000-2007 Niels Provos <provos@citi.umich.edu> |
| 5 | * Copyright 2007-2012 Niels Provos and Nick Mathewson |
| 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 | * 3. The name of the author may not be used to endorse or promote products |
| 16 | * derived from this software without specific prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 | */ |
| 29 | #include "event2/event-config.h" |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 30 | #include "evconfig-private.h" |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 31 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 32 | #ifdef EVENT__HAVE_KQUEUE |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 33 | |
| 34 | #include <sys/types.h> |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 35 | #ifdef EVENT__HAVE_SYS_TIME_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 36 | #include <sys/time.h> |
| 37 | #endif |
| 38 | #include <sys/queue.h> |
| 39 | #include <sys/event.h> |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 40 | #include <limits.h> |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 41 | #include <signal.h> |
| 42 | #include <stdio.h> |
| 43 | #include <stdlib.h> |
| 44 | #include <string.h> |
| 45 | #include <unistd.h> |
| 46 | #include <errno.h> |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 47 | #ifdef EVENT__HAVE_INTTYPES_H |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 48 | #include <inttypes.h> |
| 49 | #endif |
| 50 | |
| 51 | /* Some platforms apparently define the udata field of struct kevent as |
| 52 | * intptr_t, whereas others define it as void*. There doesn't seem to be an |
| 53 | * easy way to tell them apart via autoconf, so we need to use OS macros. */ |
Haibo Huang | f0077b8 | 2020-07-10 20:21:19 -0700 | [diff] [blame] | 54 | #if defined(__NetBSD__) |
| 55 | #define PTR_TO_UDATA(x) ((typeof(((struct kevent *)0)->udata))(x)) |
| 56 | #define INT_TO_UDATA(x) ((typeof(((struct kevent *)0)->udata))(intptr_t)(x)) |
| 57 | #elif defined(EVENT__HAVE_INTTYPES_H) && !defined(__OpenBSD__) && !defined(__FreeBSD__) && !defined(__darwin__) && !defined(__APPLE__) && !defined(__CloudABI__) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 58 | #define PTR_TO_UDATA(x) ((intptr_t)(x)) |
| 59 | #define INT_TO_UDATA(x) ((intptr_t)(x)) |
| 60 | #else |
| 61 | #define PTR_TO_UDATA(x) (x) |
| 62 | #define INT_TO_UDATA(x) ((void*)(x)) |
| 63 | #endif |
| 64 | |
| 65 | #include "event-internal.h" |
| 66 | #include "log-internal.h" |
| 67 | #include "evmap-internal.h" |
| 68 | #include "event2/thread.h" |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 69 | #include "event2/util.h" |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 70 | #include "evthread-internal.h" |
| 71 | #include "changelist-internal.h" |
| 72 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 73 | #include "kqueue-internal.h" |
| 74 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 75 | #define NEVENT 64 |
| 76 | |
| 77 | struct kqop { |
| 78 | struct kevent *changes; |
| 79 | int changes_size; |
| 80 | |
| 81 | struct kevent *events; |
| 82 | int events_size; |
| 83 | int kq; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 84 | int notify_event_added; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 85 | pid_t pid; |
| 86 | }; |
| 87 | |
| 88 | static void kqop_free(struct kqop *kqop); |
| 89 | |
| 90 | static void *kq_init(struct event_base *); |
| 91 | static int kq_sig_add(struct event_base *, int, short, short, void *); |
| 92 | static int kq_sig_del(struct event_base *, int, short, short, void *); |
| 93 | static int kq_dispatch(struct event_base *, struct timeval *); |
| 94 | static void kq_dealloc(struct event_base *); |
| 95 | |
| 96 | const struct eventop kqops = { |
| 97 | "kqueue", |
| 98 | kq_init, |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 99 | event_changelist_add_, |
| 100 | event_changelist_del_, |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 101 | kq_dispatch, |
| 102 | kq_dealloc, |
| 103 | 1 /* need reinit */, |
| 104 | EV_FEATURE_ET|EV_FEATURE_O1|EV_FEATURE_FDS, |
| 105 | EVENT_CHANGELIST_FDINFO_SIZE |
| 106 | }; |
| 107 | |
| 108 | static const struct eventop kqsigops = { |
| 109 | "kqueue_signal", |
| 110 | NULL, |
| 111 | kq_sig_add, |
| 112 | kq_sig_del, |
| 113 | NULL, |
| 114 | NULL, |
| 115 | 1 /* need reinit */, |
| 116 | 0, |
| 117 | 0 |
| 118 | }; |
| 119 | |
| 120 | static void * |
| 121 | kq_init(struct event_base *base) |
| 122 | { |
| 123 | int kq = -1; |
| 124 | struct kqop *kqueueop = NULL; |
| 125 | |
| 126 | if (!(kqueueop = mm_calloc(1, sizeof(struct kqop)))) |
| 127 | return (NULL); |
| 128 | |
| 129 | /* Initialize the kernel queue */ |
| 130 | |
| 131 | if ((kq = kqueue()) == -1) { |
| 132 | event_warn("kqueue"); |
| 133 | goto err; |
| 134 | } |
| 135 | |
| 136 | kqueueop->kq = kq; |
| 137 | |
| 138 | kqueueop->pid = getpid(); |
| 139 | |
| 140 | /* Initialize fields */ |
| 141 | kqueueop->changes = mm_calloc(NEVENT, sizeof(struct kevent)); |
| 142 | if (kqueueop->changes == NULL) |
| 143 | goto err; |
| 144 | kqueueop->events = mm_calloc(NEVENT, sizeof(struct kevent)); |
| 145 | if (kqueueop->events == NULL) |
| 146 | goto err; |
| 147 | kqueueop->events_size = kqueueop->changes_size = NEVENT; |
| 148 | |
| 149 | /* Check for Mac OS X kqueue bug. */ |
| 150 | memset(&kqueueop->changes[0], 0, sizeof kqueueop->changes[0]); |
| 151 | kqueueop->changes[0].ident = -1; |
| 152 | kqueueop->changes[0].filter = EVFILT_READ; |
| 153 | kqueueop->changes[0].flags = EV_ADD; |
| 154 | /* |
| 155 | * If kqueue works, then kevent will succeed, and it will |
| 156 | * stick an error in events[0]. If kqueue is broken, then |
| 157 | * kevent will fail. |
| 158 | */ |
| 159 | if (kevent(kq, |
| 160 | kqueueop->changes, 1, kqueueop->events, NEVENT, NULL) != 1 || |
| 161 | (int)kqueueop->events[0].ident != -1 || |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 162 | !(kqueueop->events[0].flags & EV_ERROR)) { |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 163 | event_warn("%s: detected broken kqueue; not using.", __func__); |
| 164 | goto err; |
| 165 | } |
| 166 | |
| 167 | base->evsigsel = &kqsigops; |
| 168 | |
| 169 | return (kqueueop); |
| 170 | err: |
| 171 | if (kqueueop) |
| 172 | kqop_free(kqueueop); |
| 173 | |
| 174 | return (NULL); |
| 175 | } |
| 176 | |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 177 | #define ADD_UDATA 0x30303 |
| 178 | |
| 179 | static void |
| 180 | kq_setup_kevent(struct kevent *out, evutil_socket_t fd, int filter, short change) |
| 181 | { |
| 182 | memset(out, 0, sizeof(struct kevent)); |
| 183 | out->ident = fd; |
| 184 | out->filter = filter; |
| 185 | |
| 186 | if (change & EV_CHANGE_ADD) { |
| 187 | out->flags = EV_ADD; |
| 188 | /* We set a magic number here so that we can tell 'add' |
| 189 | * errors from 'del' errors. */ |
| 190 | out->udata = INT_TO_UDATA(ADD_UDATA); |
| 191 | if (change & EV_ET) |
| 192 | out->flags |= EV_CLEAR; |
| 193 | #ifdef NOTE_EOF |
| 194 | /* Make it behave like select() and poll() */ |
| 195 | if (filter == EVFILT_READ) |
| 196 | out->fflags = NOTE_EOF; |
| 197 | #endif |
| 198 | } else { |
| 199 | EVUTIL_ASSERT(change & EV_CHANGE_DEL); |
| 200 | out->flags = EV_DELETE; |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | static int |
| 205 | kq_build_changes_list(const struct event_changelist *changelist, |
| 206 | struct kqop *kqop) |
| 207 | { |
| 208 | int i; |
| 209 | int n_changes = 0; |
| 210 | |
| 211 | for (i = 0; i < changelist->n_changes; ++i) { |
| 212 | struct event_change *in_ch = &changelist->changes[i]; |
| 213 | struct kevent *out_ch; |
| 214 | if (n_changes >= kqop->changes_size - 1) { |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 215 | int newsize; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 216 | struct kevent *newchanges; |
| 217 | |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 218 | if (kqop->changes_size > INT_MAX / 2 || |
| 219 | (size_t)kqop->changes_size * 2 > EV_SIZE_MAX / |
| 220 | sizeof(struct kevent)) { |
| 221 | event_warnx("%s: int overflow", __func__); |
| 222 | return (-1); |
| 223 | } |
| 224 | |
| 225 | newsize = kqop->changes_size * 2; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 226 | newchanges = mm_realloc(kqop->changes, |
| 227 | newsize * sizeof(struct kevent)); |
| 228 | if (newchanges == NULL) { |
| 229 | event_warn("%s: realloc", __func__); |
| 230 | return (-1); |
| 231 | } |
| 232 | kqop->changes = newchanges; |
| 233 | kqop->changes_size = newsize; |
| 234 | } |
| 235 | if (in_ch->read_change) { |
| 236 | out_ch = &kqop->changes[n_changes++]; |
| 237 | kq_setup_kevent(out_ch, in_ch->fd, EVFILT_READ, |
| 238 | in_ch->read_change); |
| 239 | } |
| 240 | if (in_ch->write_change) { |
| 241 | out_ch = &kqop->changes[n_changes++]; |
| 242 | kq_setup_kevent(out_ch, in_ch->fd, EVFILT_WRITE, |
| 243 | in_ch->write_change); |
| 244 | } |
| 245 | } |
| 246 | return n_changes; |
| 247 | } |
| 248 | |
| 249 | static int |
| 250 | kq_grow_events(struct kqop *kqop, size_t new_size) |
| 251 | { |
| 252 | struct kevent *newresult; |
| 253 | |
| 254 | newresult = mm_realloc(kqop->events, |
| 255 | new_size * sizeof(struct kevent)); |
| 256 | |
| 257 | if (newresult) { |
| 258 | kqop->events = newresult; |
| 259 | kqop->events_size = new_size; |
| 260 | return 0; |
| 261 | } else { |
| 262 | return -1; |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | static int |
| 267 | kq_dispatch(struct event_base *base, struct timeval *tv) |
| 268 | { |
| 269 | struct kqop *kqop = base->evbase; |
| 270 | struct kevent *events = kqop->events; |
| 271 | struct kevent *changes; |
| 272 | struct timespec ts, *ts_p = NULL; |
| 273 | int i, n_changes, res; |
| 274 | |
| 275 | if (tv != NULL) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 276 | ts.tv_sec = tv->tv_sec; |
| 277 | ts.tv_nsec = tv->tv_usec * 1000; |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 278 | ts_p = &ts; |
| 279 | } |
| 280 | |
| 281 | /* Build "changes" from "base->changes" */ |
| 282 | EVUTIL_ASSERT(kqop->changes); |
| 283 | n_changes = kq_build_changes_list(&base->changelist, kqop); |
| 284 | if (n_changes < 0) |
| 285 | return -1; |
| 286 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 287 | event_changelist_remove_all_(&base->changelist, base); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 288 | |
| 289 | /* steal the changes array in case some broken code tries to call |
| 290 | * dispatch twice at once. */ |
| 291 | changes = kqop->changes; |
| 292 | kqop->changes = NULL; |
| 293 | |
| 294 | /* Make sure that 'events' is at least as long as the list of changes: |
| 295 | * otherwise errors in the changes can get reported as a -1 return |
| 296 | * value from kevent() rather than as EV_ERROR events in the events |
| 297 | * array. |
| 298 | * |
| 299 | * (We could instead handle -1 return values from kevent() by |
| 300 | * retrying with a smaller changes array or a larger events array, |
| 301 | * but this approach seems less risky for now.) |
| 302 | */ |
| 303 | if (kqop->events_size < n_changes) { |
| 304 | int new_size = kqop->events_size; |
| 305 | do { |
| 306 | new_size *= 2; |
| 307 | } while (new_size < n_changes); |
| 308 | |
| 309 | kq_grow_events(kqop, new_size); |
| 310 | events = kqop->events; |
| 311 | } |
| 312 | |
| 313 | EVBASE_RELEASE_LOCK(base, th_base_lock); |
| 314 | |
| 315 | res = kevent(kqop->kq, changes, n_changes, |
| 316 | events, kqop->events_size, ts_p); |
| 317 | |
| 318 | EVBASE_ACQUIRE_LOCK(base, th_base_lock); |
| 319 | |
| 320 | EVUTIL_ASSERT(kqop->changes == NULL); |
| 321 | kqop->changes = changes; |
| 322 | |
| 323 | if (res == -1) { |
| 324 | if (errno != EINTR) { |
| 325 | event_warn("kevent"); |
| 326 | return (-1); |
| 327 | } |
| 328 | |
| 329 | return (0); |
| 330 | } |
| 331 | |
| 332 | event_debug(("%s: kevent reports %d", __func__, res)); |
| 333 | |
| 334 | for (i = 0; i < res; i++) { |
| 335 | int which = 0; |
| 336 | |
| 337 | if (events[i].flags & EV_ERROR) { |
| 338 | switch (events[i].data) { |
| 339 | |
| 340 | /* Can occur on delete if we are not currently |
| 341 | * watching any events on this fd. That can |
| 342 | * happen when the fd was closed and another |
| 343 | * file was opened with that fd. */ |
| 344 | case ENOENT: |
| 345 | /* Can occur for reasons not fully understood |
| 346 | * on FreeBSD. */ |
| 347 | case EINVAL: |
| 348 | continue; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 349 | #if defined(__FreeBSD__) |
| 350 | /* |
| 351 | * This currently occurs if an FD is closed |
| 352 | * before the EV_DELETE makes it out via kevent(). |
| 353 | * The FreeBSD capabilities code sees the blank |
| 354 | * capability set and rejects the request to |
| 355 | * modify an event. |
| 356 | * |
| 357 | * To be strictly correct - when an FD is closed, |
| 358 | * all the registered events are also removed. |
| 359 | * Queuing EV_DELETE to a closed FD is wrong. |
| 360 | * The event(s) should just be deleted from |
| 361 | * the pending changelist. |
| 362 | */ |
| 363 | case ENOTCAPABLE: |
| 364 | continue; |
| 365 | #endif |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 366 | |
| 367 | /* Can occur on a delete if the fd is closed. */ |
| 368 | case EBADF: |
| 369 | /* XXXX On NetBSD, we can also get EBADF if we |
| 370 | * try to add the write side of a pipe, but |
| 371 | * the read side has already been closed. |
| 372 | * Other BSDs call this situation 'EPIPE'. It |
| 373 | * would be good if we had a way to report |
| 374 | * this situation. */ |
| 375 | continue; |
| 376 | /* These two can occur on an add if the fd was one side |
| 377 | * of a pipe, and the other side was closed. */ |
| 378 | case EPERM: |
| 379 | case EPIPE: |
| 380 | /* Report read events, if we're listening for |
| 381 | * them, so that the user can learn about any |
| 382 | * add errors. (If the operation was a |
| 383 | * delete, then udata should be cleared.) */ |
| 384 | if (events[i].udata) { |
| 385 | /* The operation was an add: |
| 386 | * report the error as a read. */ |
| 387 | which |= EV_READ; |
| 388 | break; |
| 389 | } else { |
| 390 | /* The operation was a del: |
| 391 | * report nothing. */ |
| 392 | continue; |
| 393 | } |
| 394 | |
| 395 | /* Other errors shouldn't occur. */ |
| 396 | default: |
| 397 | errno = events[i].data; |
| 398 | return (-1); |
| 399 | } |
| 400 | } else if (events[i].filter == EVFILT_READ) { |
| 401 | which |= EV_READ; |
| 402 | } else if (events[i].filter == EVFILT_WRITE) { |
| 403 | which |= EV_WRITE; |
| 404 | } else if (events[i].filter == EVFILT_SIGNAL) { |
| 405 | which |= EV_SIGNAL; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 406 | #ifdef EVFILT_USER |
| 407 | } else if (events[i].filter == EVFILT_USER) { |
| 408 | base->is_notify_pending = 0; |
| 409 | #endif |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 410 | } |
| 411 | |
| 412 | if (!which) |
| 413 | continue; |
| 414 | |
| 415 | if (events[i].filter == EVFILT_SIGNAL) { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 416 | evmap_signal_active_(base, events[i].ident, 1); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 417 | } else { |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 418 | evmap_io_active_(base, events[i].ident, which | EV_ET); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 419 | } |
| 420 | } |
| 421 | |
| 422 | if (res == kqop->events_size) { |
| 423 | /* We used all the events space that we have. Maybe we should |
| 424 | make it bigger. */ |
| 425 | kq_grow_events(kqop, kqop->events_size * 2); |
| 426 | } |
| 427 | |
| 428 | return (0); |
| 429 | } |
| 430 | |
| 431 | static void |
| 432 | kqop_free(struct kqop *kqop) |
| 433 | { |
| 434 | if (kqop->changes) |
| 435 | mm_free(kqop->changes); |
| 436 | if (kqop->events) |
| 437 | mm_free(kqop->events); |
| 438 | if (kqop->kq >= 0 && kqop->pid == getpid()) |
| 439 | close(kqop->kq); |
| 440 | memset(kqop, 0, sizeof(struct kqop)); |
| 441 | mm_free(kqop); |
| 442 | } |
| 443 | |
| 444 | static void |
| 445 | kq_dealloc(struct event_base *base) |
| 446 | { |
| 447 | struct kqop *kqop = base->evbase; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 448 | evsig_dealloc_(base); |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 449 | kqop_free(kqop); |
| 450 | } |
| 451 | |
| 452 | /* signal handling */ |
| 453 | static int |
| 454 | kq_sig_add(struct event_base *base, int nsignal, short old, short events, void *p) |
| 455 | { |
| 456 | struct kqop *kqop = base->evbase; |
| 457 | struct kevent kev; |
| 458 | struct timespec timeout = { 0, 0 }; |
| 459 | (void)p; |
| 460 | |
| 461 | EVUTIL_ASSERT(nsignal >= 0 && nsignal < NSIG); |
| 462 | |
| 463 | memset(&kev, 0, sizeof(kev)); |
| 464 | kev.ident = nsignal; |
| 465 | kev.filter = EVFILT_SIGNAL; |
| 466 | kev.flags = EV_ADD; |
| 467 | |
| 468 | /* Be ready for the signal if it is sent any |
| 469 | * time between now and the next call to |
| 470 | * kq_dispatch. */ |
| 471 | if (kevent(kqop->kq, &kev, 1, NULL, 0, &timeout) == -1) |
| 472 | return (-1); |
| 473 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 474 | /* We can set the handler for most signals to SIG_IGN and |
| 475 | * still have them reported to us in the queue. However, |
| 476 | * if the handler for SIGCHLD is SIG_IGN, the system reaps |
| 477 | * zombie processes for us, and we don't get any notification. |
| 478 | * This appears to be the only signal with this quirk. */ |
| 479 | if (evsig_set_handler_(base, nsignal, |
| 480 | nsignal == SIGCHLD ? SIG_DFL : SIG_IGN) == -1) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 481 | return (-1); |
| 482 | |
| 483 | return (0); |
| 484 | } |
| 485 | |
| 486 | static int |
| 487 | kq_sig_del(struct event_base *base, int nsignal, short old, short events, void *p) |
| 488 | { |
| 489 | struct kqop *kqop = base->evbase; |
| 490 | struct kevent kev; |
| 491 | |
| 492 | struct timespec timeout = { 0, 0 }; |
| 493 | (void)p; |
| 494 | |
| 495 | EVUTIL_ASSERT(nsignal >= 0 && nsignal < NSIG); |
| 496 | |
| 497 | memset(&kev, 0, sizeof(kev)); |
| 498 | kev.ident = nsignal; |
| 499 | kev.filter = EVFILT_SIGNAL; |
| 500 | kev.flags = EV_DELETE; |
| 501 | |
| 502 | /* Because we insert signal events |
| 503 | * immediately, we need to delete them |
| 504 | * immediately, too */ |
| 505 | if (kevent(kqop->kq, &kev, 1, NULL, 0, &timeout) == -1) |
| 506 | return (-1); |
| 507 | |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 508 | if (evsig_restore_handler_(base, nsignal) == -1) |
Christopher Wiley | e867981 | 2015-07-01 13:36:18 -0700 | [diff] [blame] | 509 | return (-1); |
| 510 | |
| 511 | return (0); |
| 512 | } |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 513 | |
| 514 | |
| 515 | /* OSX 10.6 and FreeBSD 8.1 add support for EVFILT_USER, which we can use |
| 516 | * to wake up the event loop from another thread. */ |
| 517 | |
| 518 | /* Magic number we use for our filter ID. */ |
| 519 | #define NOTIFY_IDENT 42 |
| 520 | |
| 521 | int |
| 522 | event_kq_add_notify_event_(struct event_base *base) |
| 523 | { |
| 524 | struct kqop *kqop = base->evbase; |
| 525 | #if defined(EVFILT_USER) && defined(NOTE_TRIGGER) |
| 526 | struct kevent kev; |
| 527 | struct timespec timeout = { 0, 0 }; |
| 528 | #endif |
| 529 | |
| 530 | if (kqop->notify_event_added) |
| 531 | return 0; |
| 532 | |
| 533 | #if defined(EVFILT_USER) && defined(NOTE_TRIGGER) |
| 534 | memset(&kev, 0, sizeof(kev)); |
| 535 | kev.ident = NOTIFY_IDENT; |
| 536 | kev.filter = EVFILT_USER; |
| 537 | kev.flags = EV_ADD | EV_CLEAR; |
| 538 | |
| 539 | if (kevent(kqop->kq, &kev, 1, NULL, 0, &timeout) == -1) { |
| 540 | event_warn("kevent: adding EVFILT_USER event"); |
| 541 | return -1; |
| 542 | } |
| 543 | |
| 544 | kqop->notify_event_added = 1; |
| 545 | |
| 546 | return 0; |
| 547 | #else |
| 548 | return -1; |
| 549 | #endif |
| 550 | } |
| 551 | |
| 552 | int |
| 553 | event_kq_notify_base_(struct event_base *base) |
| 554 | { |
| 555 | struct kqop *kqop = base->evbase; |
| 556 | #if defined(EVFILT_USER) && defined(NOTE_TRIGGER) |
| 557 | struct kevent kev; |
| 558 | struct timespec timeout = { 0, 0 }; |
| 559 | #endif |
| 560 | if (! kqop->notify_event_added) |
| 561 | return -1; |
| 562 | |
| 563 | #if defined(EVFILT_USER) && defined(NOTE_TRIGGER) |
| 564 | memset(&kev, 0, sizeof(kev)); |
| 565 | kev.ident = NOTIFY_IDENT; |
| 566 | kev.filter = EVFILT_USER; |
| 567 | kev.fflags = NOTE_TRIGGER; |
| 568 | |
| 569 | if (kevent(kqop->kq, &kev, 1, NULL, 0, &timeout) == -1) { |
| 570 | event_warn("kevent: triggering EVFILT_USER event"); |
| 571 | return -1; |
| 572 | } |
| 573 | |
| 574 | return 0; |
| 575 | #else |
| 576 | return -1; |
| 577 | #endif |
| 578 | } |
| 579 | |
| 580 | #endif /* EVENT__HAVE_KQUEUE */ |