--- /dev/null
+/* $OpenBSD: kqueue.c,v 1.5 2002/07/10 14:41:31 art Exp $ */
+
+/*
+ * Copyright 2000-2007 Niels Provos <provos@citi.umich.edu>
+ * Copyright 2007-2010 Niels Provos and Nick Mathewson
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include "event2/event-config.h"
+
+#define _GNU_SOURCE
+
+#include <sys/types.h>
+#ifdef _EVENT_HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+#include <sys/queue.h>
+#include <sys/event.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#ifdef _EVENT_HAVE_INTTYPES_H
+#include <inttypes.h>
+#endif
+
+/* Some platforms apparently define the udata field of struct kevent as
+ * intptr_t, whereas others define it as void*. There doesn't seem to be an
+ * easy way to tell them apart via autoconf, so we need to use OS macros. */
+#if defined(_EVENT_HAVE_INTTYPES_H) && !defined(__OpenBSD__) && !defined(__FreeBSD__) && !defined(__darwin__) && !defined(__APPLE__)
+#define PTR_TO_UDATA(x) ((intptr_t)(x))
+#else
+#define PTR_TO_UDATA(x) (x)
+#endif
+
+#include "event-internal.h"
+#include "log-internal.h"
+#include "evmap-internal.h"
+#include "event2/thread.h"
+#include "evthread-internal.h"
+#include "changelist-internal.h"
+
+#define NEVENT 64
+
+struct kqop {
+ struct kevent *changes;
+ int changes_size;
+
+ struct kevent *events;
+ int events_size;
+ int kq;
+ pid_t pid;
+};
+
+static void kqop_free(struct kqop *kqop);
+
+static void *kq_init(struct event_base *);
+static int kq_sig_add(struct event_base *, int, short, short, void *);
+static int kq_sig_del(struct event_base *, int, short, short, void *);
+static int kq_dispatch(struct event_base *, struct timeval *);
+static void kq_dealloc(struct event_base *);
+
+const struct eventop kqops = {
+ "kqueue",
+ kq_init,
+ event_changelist_add,
+ event_changelist_del,
+ kq_dispatch,
+ kq_dealloc,
+ 1 /* need reinit */,
+ EV_FEATURE_ET|EV_FEATURE_O1|EV_FEATURE_FDS,
+ EVENT_CHANGELIST_FDINFO_SIZE
+};
+
+static const struct eventop kqsigops = {
+ "kqueue_signal",
+ NULL,
+ kq_sig_add,
+ kq_sig_del,
+ NULL,
+ NULL,
+ 1 /* need reinit */,
+ 0,
+ 0
+};
+
+static void *
+kq_init(struct event_base *base)
+{
+ int kq = -1;
+ struct kqop *kqueueop = NULL;
+
+ if (!(kqueueop = mm_calloc(1, sizeof(struct kqop))))
+ return (NULL);
+
+/* Initialize the kernel queue */
+
+ if ((kq = kqueue()) == -1) {
+ event_warn("kqueue");
+ goto err;
+ }
+
+ kqueueop->kq = kq;
+
+ kqueueop->pid = getpid();
+
+ /* Initialize fields */
+ kqueueop->changes = mm_calloc(NEVENT, sizeof(struct kevent));
+ if (kqueueop->changes == NULL)
+ goto err;
+ kqueueop->events = mm_calloc(NEVENT, sizeof(struct kevent));
+ if (kqueueop->events == NULL)
+ goto err;
+ kqueueop->events_size = kqueueop->changes_size = NEVENT;
+
+ /* Check for Mac OS X kqueue bug. */
+ memset(&kqueueop->changes[0], 0, sizeof kqueueop->changes[0]);
+ kqueueop->changes[0].ident = -1;
+ kqueueop->changes[0].filter = EVFILT_READ;
+ kqueueop->changes[0].flags = EV_ADD;
+ /*
+ * If kqueue works, then kevent will succeed, and it will
+ * stick an error in events[0]. If kqueue is broken, then
+ * kevent will fail.
+ */
+ if (kevent(kq,
+ kqueueop->changes, 1, kqueueop->events, NEVENT, NULL) != 1 ||
+ (int)kqueueop->events[0].ident != -1 ||
+ kqueueop->events[0].flags != EV_ERROR) {
+ event_warn("%s: detected broken kqueue; not using.", __func__);
+ goto err;
+ }
+
+ base->evsigsel = &kqsigops;
+
+ return (kqueueop);
+err:
+ if (kqueueop)
+ kqop_free(kqueueop);
+
+ return (NULL);
+}
+
+static void
+kq_sighandler(int sig)
+{
+ /* Do nothing here */
+}
+
+static void
+kq_setup_kevent(struct kevent *out, evutil_socket_t fd, int filter, short change)
+{
+ memset(out, 0, sizeof(out));
+ out->ident = fd;
+ out->filter = filter;
+
+ if (change & EV_CHANGE_ADD) {
+ out->flags = EV_ADD;
+ if (change & EV_ET)
+ out->flags |= EV_CLEAR;
+#ifdef NOTE_EOF
+ /* Make it behave like select() and poll() */
+ if (filter == EVFILT_READ)
+ out->fflags = NOTE_EOF;
+#endif
+ } else {
+ EVUTIL_ASSERT(change & EV_CHANGE_DEL);
+ out->flags = EV_DELETE;
+ }
+}
+
+static int
+kq_build_changes_list(const struct event_changelist *changelist,
+ struct kqop *kqop)
+{
+ int i;
+ int n_changes = 0;
+
+ for (i = 0; i < changelist->n_changes; ++i) {
+ struct event_change *in_ch = &changelist->changes[i];
+ struct kevent *out_ch;
+ if (n_changes >= kqop->changes_size - 1) {
+ int newsize = kqop->changes_size * 2;
+ struct kevent *newchanges;
+
+ newchanges = mm_realloc(kqop->changes,
+ newsize * sizeof(struct kevent));
+ if (newchanges == NULL) {
+ event_warn("%s: realloc", __func__);
+ return (-1);
+ }
+ kqop->changes = newchanges;
+ kqop->changes_size = newsize;
+ }
+ if (in_ch->read_change) {
+ out_ch = &kqop->changes[n_changes++];
+ kq_setup_kevent(out_ch, in_ch->fd, EVFILT_READ,
+ in_ch->read_change);
+ }
+ if (in_ch->write_change) {
+ out_ch = &kqop->changes[n_changes++];
+ kq_setup_kevent(out_ch, in_ch->fd, EVFILT_WRITE,
+ in_ch->write_change);
+ }
+ }
+ return n_changes;
+}
+
+static int
+kq_dispatch(struct event_base *base, struct timeval *tv)
+{
+ struct kqop *kqop = base->evbase;
+ struct kevent *events = kqop->events;
+ struct kevent *changes;
+ struct timespec ts, *ts_p = NULL;
+ int i, n_changes, res;
+
+ if (tv != NULL) {
+ TIMEVAL_TO_TIMESPEC(tv, &ts);
+ ts_p = &ts;
+ }
+
+ /* Build "changes" from "base->changes" */
+ EVUTIL_ASSERT(kqop->changes);
+ n_changes = kq_build_changes_list(&base->changelist, kqop);
+ if (n_changes < 0)
+ return -1;
+
+ event_changelist_remove_all(&base->changelist, base);
+
+ /* steal the changes array in case some broken code tries to call
+ * dispatch twice at once. */
+ changes = kqop->changes;
+ kqop->changes = NULL;
+
+ EVBASE_RELEASE_LOCK(base, th_base_lock);
+
+ res = kevent(kqop->kq, changes, n_changes,
+ events, kqop->events_size, ts_p);
+
+ EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+
+ EVUTIL_ASSERT(kqop->changes == NULL);
+ kqop->changes = changes;
+
+ if (res == -1) {
+ if (errno != EINTR) {
+ event_warn("kevent");
+ return (-1);
+ }
+
+ return (0);
+ }
+
+ event_debug(("%s: kevent reports %d", __func__, res));
+
+ for (i = 0; i < res; i++) {
+ int which = 0;
+
+ if (events[i].flags & EV_ERROR) {
+ /*
+ * Error messages that can happen, when a delete fails.
+ * EBADF happens when the file descriptor has been
+ * closed,
+ * ENOENT when the file descriptor was closed and
+ * then reopened.
+ * EINVAL for some reasons not understood; EINVAL
+ * should not be returned ever; but FreeBSD does :-\
+ * An error is also indicated when a callback deletes
+ * an event we are still processing. In that case
+ * the data field is set to ENOENT.
+ */
+ if (events[i].data == EBADF ||
+ events[i].data == EINVAL ||
+ events[i].data == ENOENT)
+ continue;
+ errno = events[i].data;
+ return (-1);
+ }
+
+ if (events[i].filter == EVFILT_READ) {
+ which |= EV_READ;
+ } else if (events[i].filter == EVFILT_WRITE) {
+ which |= EV_WRITE;
+ } else if (events[i].filter == EVFILT_SIGNAL) {
+ which |= EV_SIGNAL;
+ }
+
+ if (!which)
+ continue;
+
+ if (events[i].filter == EVFILT_SIGNAL) {
+ evmap_signal_active(base, events[i].ident, 1);
+ } else {
+ evmap_io_active(base, events[i].ident, which | EV_ET);
+ }
+ }
+
+ if (res == kqop->events_size) {
+ struct kevent *newresult;
+ int size = kqop->events_size;
+ /* We used all the events space that we have. Maybe we should
+ make it bigger. */
+ size *= 2;
+ newresult = mm_realloc(kqop->events,
+ size * sizeof(struct kevent));
+ if (newresult) {
+ kqop->events = newresult;
+ kqop->events_size = size;
+ }
+ }
+
+ return (0);
+}
+
+static void
+kqop_free(struct kqop *kqop)
+{
+ if (kqop->changes)
+ mm_free(kqop->changes);
+ if (kqop->events)
+ mm_free(kqop->events);
+ if (kqop->kq >= 0 && kqop->pid == getpid())
+ close(kqop->kq);
+ memset(kqop, 0, sizeof(struct kqop));
+ mm_free(kqop);
+}
+
+static void
+kq_dealloc(struct event_base *base)
+{
+ struct kqop *kqop = base->evbase;
+ evsig_dealloc(base);
+ kqop_free(kqop);
+}
+
+/* signal handling */
+static int
+kq_sig_add(struct event_base *base, int nsignal, short old, short events, void *p)
+{
+ struct kqop *kqop = base->evbase;
+ struct kevent kev;
+ struct timespec timeout = { 0, 0 };
+ (void)p;
+
+ EVUTIL_ASSERT(nsignal >= 0 && nsignal < NSIG);
+
+ memset(&kev, 0, sizeof(kev));
+ kev.ident = nsignal;
+ kev.filter = EVFILT_SIGNAL;
+ kev.flags = EV_ADD;
+
+ /* Be ready for the signal if it is sent any
+ * time between now and the next call to
+ * kq_dispatch. */
+ if (kevent(kqop->kq, &kev, 1, NULL, 0, &timeout) == -1)
+ return (-1);
+
+ /* XXXX The manpage suggest we could use SIG_IGN instead of a
+ * do-nothing handler */
+ if (_evsig_set_handler(base, nsignal, kq_sighandler) == -1)
+ return (-1);
+
+ return (0);
+}
+
+static int
+kq_sig_del(struct event_base *base, int nsignal, short old, short events, void *p)
+{
+ struct kqop *kqop = base->evbase;
+ struct kevent kev;
+
+ struct timespec timeout = { 0, 0 };
+ (void)p;
+
+ EVUTIL_ASSERT(nsignal >= 0 && nsignal < NSIG);
+
+ memset(&kev, 0, sizeof(kev));
+ kev.ident = nsignal;
+ kev.filter = EVFILT_SIGNAL;
+ kev.flags = EV_DELETE;
+
+ /* Because we insert signal events
+ * immediately, we need to delete them
+ * immediately, too */
+ if (kevent(kqop->kq, &kev, 1, NULL, 0, &timeout) == -1)
+ return (-1);
+
+ if (_evsig_restore_handler(base, nsignal) == -1)
+ return (-1);
+
+ return (0);
+}
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