433 lines
10 KiB
C
433 lines
10 KiB
C
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/* $OpenBSD: kqueue.c,v 1.5 2002/07/10 14:41:31 art Exp $ */
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/*
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* Copyright 2000-2002 Niels Provos <provos@citi.umich.edu>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#define _GNU_SOURCE 1
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#include <sys/types.h>
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#else
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#include <sys/_libevent_time.h>
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#endif
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#include <sys/queue.h>
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#include <sys/event.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <assert.h>
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#ifdef HAVE_INTTYPES_H
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#include <inttypes.h>
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#endif
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/* Some platforms apparently define the udata field of struct kevent as
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* intptr_t, whereas others define it as void*. There doesn't seem to be an
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* easy way to tell them apart via autoconf, so we need to use OS macros. */
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#if defined(HAVE_INTTYPES_H) && !defined(__OpenBSD__) && !defined(__FreeBSD__) && !defined(__darwin__) && !defined(__APPLE__)
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#define PTR_TO_UDATA(x) ((intptr_t)(x))
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#else
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#define PTR_TO_UDATA(x) (x)
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#endif
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#include "event.h"
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#include "event-internal.h"
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#include "log.h"
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#include "evsignal.h"
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#define EVLIST_X_KQINKERNEL 0x1000
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#define NEVENT 64
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struct kqop {
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struct kevent *changes;
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int nchanges;
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struct kevent *events;
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struct event_list evsigevents[NSIG];
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int nevents;
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int kq;
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pid_t pid;
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};
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static void *kq_init (struct event_base *);
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static int kq_add (void *, struct event *);
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static int kq_del (void *, struct event *);
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static int kq_dispatch (struct event_base *, void *, struct timeval *);
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static int kq_insert (struct kqop *, struct kevent *);
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static void kq_dealloc (struct event_base *, void *);
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const struct eventop kqops = {
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"kqueue",
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kq_init,
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kq_add,
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kq_del,
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kq_dispatch,
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kq_dealloc,
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1 /* need reinit */
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};
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static void *
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kq_init(struct event_base *base)
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{
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int i, kq;
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struct kqop *kqueueop;
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/* Disable kqueue when this environment variable is set */
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if (evutil_getenv("EVENT_NOKQUEUE"))
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return (NULL);
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if (!(kqueueop = calloc(1, sizeof(struct kqop))))
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return (NULL);
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/* Initalize the kernel queue */
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if ((kq = kqueue()) == -1) {
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event_warn("kqueue");
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free (kqueueop);
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return (NULL);
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}
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kqueueop->kq = kq;
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kqueueop->pid = getpid();
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/* Initalize fields */
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kqueueop->changes = malloc(NEVENT * sizeof(struct kevent));
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if (kqueueop->changes == NULL) {
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free (kqueueop);
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return (NULL);
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}
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kqueueop->events = malloc(NEVENT * sizeof(struct kevent));
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if (kqueueop->events == NULL) {
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free (kqueueop->changes);
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free (kqueueop);
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return (NULL);
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}
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kqueueop->nevents = NEVENT;
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/* we need to keep track of multiple events per signal */
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for (i = 0; i < NSIG; ++i) {
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TAILQ_INIT(&kqueueop->evsigevents[i]);
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}
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return (kqueueop);
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}
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static int
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kq_insert(struct kqop *kqop, struct kevent *kev)
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{
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int nevents = kqop->nevents;
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if (kqop->nchanges == nevents) {
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struct kevent *newchange;
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struct kevent *newresult;
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nevents *= 2;
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newchange = realloc(kqop->changes,
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nevents * sizeof(struct kevent));
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if (newchange == NULL) {
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event_warn("%s: malloc", __func__);
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return (-1);
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}
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kqop->changes = newchange;
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newresult = realloc(kqop->events,
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nevents * sizeof(struct kevent));
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/*
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* If we fail, we don't have to worry about freeing,
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* the next realloc will pick it up.
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*/
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if (newresult == NULL) {
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event_warn("%s: malloc", __func__);
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return (-1);
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}
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kqop->events = newresult;
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kqop->nevents = nevents;
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}
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memcpy(&kqop->changes[kqop->nchanges++], kev, sizeof(struct kevent));
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event_debug(("%s: fd %d %s%s",
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__func__, (int)kev->ident,
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kev->filter == EVFILT_READ ? "EVFILT_READ" : "EVFILT_WRITE",
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kev->flags == EV_DELETE ? " (del)" : ""));
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return (0);
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}
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static void
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kq_sighandler(int sig)
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{
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/* Do nothing here */
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}
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static int
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kq_dispatch(struct event_base *base, void *arg, struct timeval *tv)
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{
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struct kqop *kqop = arg;
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struct kevent *changes = kqop->changes;
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struct kevent *events = kqop->events;
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struct event *ev;
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struct timespec ts, *ts_p = NULL;
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int i, res;
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if (tv != NULL) {
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TIMEVAL_TO_TIMESPEC(tv, &ts);
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ts_p = &ts;
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}
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res = kevent(kqop->kq, changes, kqop->nchanges,
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events, kqop->nevents, ts_p);
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kqop->nchanges = 0;
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if (res == -1) {
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if (errno != EINTR) {
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event_warn("kevent");
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return (-1);
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}
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return (0);
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}
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event_debug(("%s: kevent reports %d", __func__, res));
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for (i = 0; i < res; i++) {
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int which = 0;
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if (events[i].flags & EV_ERROR) {
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/*
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* Error messages that can happen, when a delete fails.
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* EBADF happens when the file discriptor has been
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* closed,
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* ENOENT when the file discriptor was closed and
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* then reopened.
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* EINVAL for some reasons not understood; EINVAL
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* should not be returned ever; but FreeBSD does :-\
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* An error is also indicated when a callback deletes
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* an event we are still processing. In that case
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* the data field is set to ENOENT.
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*/
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if (events[i].data == EBADF ||
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events[i].data == EINVAL ||
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events[i].data == ENOENT)
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continue;
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errno = events[i].data;
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return (-1);
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}
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if (events[i].filter == EVFILT_READ) {
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which |= EV_READ;
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} else if (events[i].filter == EVFILT_WRITE) {
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which |= EV_WRITE;
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} else if (events[i].filter == EVFILT_SIGNAL) {
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which |= EV_SIGNAL;
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}
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if (!which)
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continue;
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if (events[i].filter == EVFILT_SIGNAL) {
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struct event_list *head =
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(struct event_list *)events[i].udata;
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TAILQ_FOREACH(ev, head, ev_signal_next) {
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event_active(ev, which, events[i].data);
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}
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} else {
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ev = (struct event *)events[i].udata;
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if (!(ev->ev_events & EV_PERSIST))
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ev->ev_flags &= ~EVLIST_X_KQINKERNEL;
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event_active(ev, which, 1);
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}
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}
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return (0);
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}
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static int
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kq_add(void *arg, struct event *ev)
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{
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struct kqop *kqop = arg;
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struct kevent kev;
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if (ev->ev_events & EV_SIGNAL) {
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int nsignal = EVENT_SIGNAL(ev);
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assert(nsignal >= 0 && nsignal < NSIG);
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if (TAILQ_EMPTY(&kqop->evsigevents[nsignal])) {
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struct timespec timeout = { 0, 0 };
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memset(&kev, 0, sizeof(kev));
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kev.ident = nsignal;
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kev.filter = EVFILT_SIGNAL;
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kev.flags = EV_ADD;
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kev.udata = PTR_TO_UDATA(&kqop->evsigevents[nsignal]);
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/* Be ready for the signal if it is sent any
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* time between now and the next call to
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* kq_dispatch. */
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if (kevent(kqop->kq, &kev, 1, NULL, 0, &timeout) == -1)
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return (-1);
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if (_evsignal_set_handler(ev->ev_base, nsignal,
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kq_sighandler) == -1)
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return (-1);
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}
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TAILQ_INSERT_TAIL(&kqop->evsigevents[nsignal], ev,
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ev_signal_next);
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ev->ev_flags |= EVLIST_X_KQINKERNEL;
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return (0);
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}
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if (ev->ev_events & EV_READ) {
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memset(&kev, 0, sizeof(kev));
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kev.ident = ev->ev_fd;
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kev.filter = EVFILT_READ;
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#ifdef NOTE_EOF
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/* Make it behave like select() and poll() */
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kev.fflags = NOTE_EOF;
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#endif
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kev.flags = EV_ADD;
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if (!(ev->ev_events & EV_PERSIST))
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kev.flags |= EV_ONESHOT;
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kev.udata = PTR_TO_UDATA(ev);
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if (kq_insert(kqop, &kev) == -1)
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return (-1);
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ev->ev_flags |= EVLIST_X_KQINKERNEL;
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}
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if (ev->ev_events & EV_WRITE) {
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memset(&kev, 0, sizeof(kev));
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kev.ident = ev->ev_fd;
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kev.filter = EVFILT_WRITE;
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kev.flags = EV_ADD;
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if (!(ev->ev_events & EV_PERSIST))
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kev.flags |= EV_ONESHOT;
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kev.udata = PTR_TO_UDATA(ev);
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if (kq_insert(kqop, &kev) == -1)
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return (-1);
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ev->ev_flags |= EVLIST_X_KQINKERNEL;
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}
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return (0);
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}
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static int
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kq_del(void *arg, struct event *ev)
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{
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struct kqop *kqop = arg;
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struct kevent kev;
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if (!(ev->ev_flags & EVLIST_X_KQINKERNEL))
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return (0);
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if (ev->ev_events & EV_SIGNAL) {
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int nsignal = EVENT_SIGNAL(ev);
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struct timespec timeout = { 0, 0 };
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assert(nsignal >= 0 && nsignal < NSIG);
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TAILQ_REMOVE(&kqop->evsigevents[nsignal], ev, ev_signal_next);
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if (TAILQ_EMPTY(&kqop->evsigevents[nsignal])) {
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memset(&kev, 0, sizeof(kev));
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kev.ident = nsignal;
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kev.filter = EVFILT_SIGNAL;
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kev.flags = EV_DELETE;
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/* Because we insert signal events
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* immediately, we need to delete them
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* immediately, too */
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if (kevent(kqop->kq, &kev, 1, NULL, 0, &timeout) == -1)
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return (-1);
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if (_evsignal_restore_handler(ev->ev_base,
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nsignal) == -1)
|
||
|
|
return (-1);
|
||
|
|
}
|
||
|
|
|
||
|
|
ev->ev_flags &= ~EVLIST_X_KQINKERNEL;
|
||
|
|
return (0);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (ev->ev_events & EV_READ) {
|
||
|
|
memset(&kev, 0, sizeof(kev));
|
||
|
|
kev.ident = ev->ev_fd;
|
||
|
|
kev.filter = EVFILT_READ;
|
||
|
|
kev.flags = EV_DELETE;
|
||
|
|
|
||
|
|
if (kq_insert(kqop, &kev) == -1)
|
||
|
|
return (-1);
|
||
|
|
|
||
|
|
ev->ev_flags &= ~EVLIST_X_KQINKERNEL;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (ev->ev_events & EV_WRITE) {
|
||
|
|
memset(&kev, 0, sizeof(kev));
|
||
|
|
kev.ident = ev->ev_fd;
|
||
|
|
kev.filter = EVFILT_WRITE;
|
||
|
|
kev.flags = EV_DELETE;
|
||
|
|
|
||
|
|
if (kq_insert(kqop, &kev) == -1)
|
||
|
|
return (-1);
|
||
|
|
|
||
|
|
ev->ev_flags &= ~EVLIST_X_KQINKERNEL;
|
||
|
|
}
|
||
|
|
|
||
|
|
return (0);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
kq_dealloc(struct event_base *base, void *arg)
|
||
|
|
{
|
||
|
|
struct kqop *kqop = arg;
|
||
|
|
|
||
|
|
evsignal_dealloc(base);
|
||
|
|
|
||
|
|
if (kqop->changes)
|
||
|
|
free(kqop->changes);
|
||
|
|
if (kqop->events)
|
||
|
|
free(kqop->events);
|
||
|
|
if (kqop->kq >= 0 && kqop->pid == getpid())
|
||
|
|
close(kqop->kq);
|
||
|
|
|
||
|
|
memset(kqop, 0, sizeof(struct kqop));
|
||
|
|
free(kqop);
|
||
|
|
}
|