379 lines
8.3 KiB
C
379 lines
8.3 KiB
C
/* $NetBSD: kqueue.c,v 1.4 2003/10/11 18:30:09 provos Exp $ */
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Niels Provos.
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* 4. 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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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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/_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 <err.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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#ifdef USE_LOG
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#include "log.h"
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#else
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#define LOG_DBG(x)
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#define log_error warn
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#endif
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#ifdef HAVE_INTTYPES_H
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#define INTPTR(x) (intptr_t)x
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#else
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#define INTPTR(x) x
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#endif
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#include "event.h"
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extern struct event_list timequeue;
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extern struct event_list eventqueue;
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extern struct event_list addqueue;
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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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int nevents;
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int kq;
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} kqueueop;
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void *kq_init (void);
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int kq_add (void *, struct event *);
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int kq_del (void *, struct event *);
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int kq_recalc (void *, int);
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int kq_dispatch (void *, struct timeval *);
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int kq_insert (struct kqop *, struct kevent *);
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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_recalc,
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kq_dispatch
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};
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void *
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kq_init(void)
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{
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int kq;
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/* Disable kqueue when this environment variable is set */
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if (!issetugid() && getenv("EVENT_NOKQUEUE"))
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return (NULL);
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memset(&kqueueop, 0, sizeof(kqueueop));
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/* Initalize the kernel queue */
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if ((kq = kqueue()) == -1) {
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log_error("kqueue");
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return (NULL);
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}
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kqueueop.kq = kq;
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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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return (NULL);
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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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return (NULL);
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}
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kqueueop.nevents = NEVENT;
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return (&kqueueop);
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}
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int
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kq_recalc(void *arg, int max)
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{
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return (0);
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}
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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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log_error("%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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log_error("%s: malloc", __func__);
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return (-1);
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}
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kqop->events = newchange;
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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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LOG_DBG((LOG_MISC, 70, "%s: fd %d %s%s",
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__func__, 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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int
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kq_dispatch(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;
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int i, res;
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TIMEVAL_TO_TIMESPEC(tv, &ts);
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res = kevent(kqop->kq, changes, kqop->nchanges,
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events, kqop->nevents, &ts);
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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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log_error("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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LOG_DBG((LOG_MISC, 80, "%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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* 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 == ENOENT)
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continue;
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return (-1);
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}
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ev = (struct event *)events[i].udata;
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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 (!(ev->ev_events & EV_PERSIST)) {
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ev->ev_flags &= ~EVLIST_X_KQINKERNEL;
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event_del(ev);
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}
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event_active(ev, which,
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ev->ev_events & EV_SIGNAL ? events[i].data : 1);
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}
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return (0);
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}
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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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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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if (!(ev->ev_events & EV_PERSIST))
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kev.flags |= EV_ONESHOT;
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kev.udata = INTPTR(ev);
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if (kq_insert(kqop, &kev) == -1)
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return (-1);
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if (signal(nsignal, kq_sighandler) == SIG_ERR)
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return (-1);
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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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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 = INTPTR(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 = INTPTR(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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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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memset(&kev, 0, sizeof(kev));
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kev.ident = (int)signal;
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kev.filter = EVFILT_SIGNAL;
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kev.flags = EV_DELETE;
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if (kq_insert(kqop, &kev) == -1)
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return (-1);
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if (signal(nsignal, SIG_DFL) == SIG_ERR)
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return (-1);
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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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kev.flags = EV_DELETE;
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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_DELETE;
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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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