root/sapi/fpm/fpm/events/kqueue.c

DEFINITIONS

1. fpm_event_kqueue_module
2. fpm_event_kqueue_init
3. fpm_event_kqueue_clean
4. fpm_event_kqueue_wait
5. fpm_event_kqueue_add
6. fpm_event_kqueue_remove

/*
   +----------------------------------------------------------------------+
   | PHP Version 5                                                        |
   +----------------------------------------------------------------------+
   | Copyright (c) 1997-2015 The PHP Group                                |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | http://www.php.net/license/3_01.txt                                  |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Authors: Jerome Loyet <jerome@loyet.net>                             |
   +----------------------------------------------------------------------+
*/

/* $Id$ */

#include "../fpm_config.h"
#include "../fpm_events.h"
#include "../fpm.h"
#include "../zlog.h"

#if HAVE_KQUEUE

#include <sys/types.h>
#include <sys/event.h>
#include <sys/time.h>

#include <errno.h>

static int fpm_event_kqueue_init(int max);
static int fpm_event_kqueue_clean();
static int fpm_event_kqueue_wait(struct fpm_event_queue_s *queue, unsigned long int timeout);
static int fpm_event_kqueue_add(struct fpm_event_s *ev);
static int fpm_event_kqueue_remove(struct fpm_event_s *ev);

static struct fpm_event_module_s kqueue_module = {
        .name = "kqueue",
        .support_edge_trigger = 1,
        .init = fpm_event_kqueue_init,
        .clean = fpm_event_kqueue_clean,
        .wait = fpm_event_kqueue_wait,
        .add = fpm_event_kqueue_add,
        .remove = fpm_event_kqueue_remove, 
};

static struct kevent *kevents = NULL;
static int nkevents = 0;
static int kfd = 0;

#endif /* HAVE_KQUEUE */

/*
 * Return the module configuration
 */
struct fpm_event_module_s *fpm_event_kqueue_module() /* {{{ */
{
#if HAVE_KQUEUE
        return &kqueue_module;
#else
        return NULL;
#endif /* HAVE_KQUEUE */
}
/* }}} */

#if HAVE_KQUEUE

/*
 * init kqueue and stuff
 */
static int fpm_event_kqueue_init(int max) /* {{{ */
{
        if (max < 1) {
                return 0;
        }

        kfd = kqueue();
        if (kfd < 0) {
                zlog(ZLOG_ERROR, "kqueue: unable to initialize");
                return -1;
        }

        kevents = malloc(sizeof(struct kevent) * max);
        if (!kevents) {
                zlog(ZLOG_ERROR, "epoll: unable to allocate %d events", max);
                return -1;
        }

        memset(kevents, 0, sizeof(struct kevent) * max);

        nkevents = max;

        return 0;
}
/* }}} */

/*
 * release kqueue stuff
 */
static int fpm_event_kqueue_clean() /* {{{ */
{
        if (kevents) {
                free(kevents);
                kevents = NULL;
        }

        nkevents = 0;

        return 0;
}
/* }}} */

/*
 * wait for events or timeout
 */
static int fpm_event_kqueue_wait(struct fpm_event_queue_s *queue, unsigned long int timeout) /* {{{ */
{
        struct timespec t;
        int ret, i;

        /* ensure we have a clean kevents before calling kevent() */
        memset(kevents, 0, sizeof(struct kevent) * nkevents);

        /* convert ms to timespec struct */
        t.tv_sec = timeout / 1000;
        t.tv_nsec = (timeout % 1000) * 1000 * 1000;

        /* wait for incoming event or timeout */
        ret = kevent(kfd, NULL, 0, kevents, nkevents, &t);
        if (ret == -1) {

                /* trigger error unless signal interrupt */
                if (errno != EINTR) {
                        zlog(ZLOG_WARNING, "epoll_wait() returns %d", errno);
                        return -1;
                }
        }

        /* fire triggered events */
        for (i = 0; i < ret; i++) {
                if (kevents[i].udata) {
                        struct fpm_event_s *ev = (struct fpm_event_s *)kevents[i].udata;
                        fpm_event_fire(ev);
                        /* sanity check */
                        if (fpm_globals.parent_pid != getpid()) {
                                return -2;
                        }
                }
        }

        return ret;
}
/* }}} */

/*
 * Add a FD to to kevent queue
 */
static int fpm_event_kqueue_add(struct fpm_event_s *ev) /* {{{ */
{
        struct kevent k;
        int flags = EV_ADD;

        if (ev->flags & FPM_EV_EDGE) {
                        flags = flags | EV_CLEAR;
        }

        EV_SET(&k, ev->fd, EVFILT_READ, flags, 0, 0, (void *)ev);

        if (kevent(kfd, &k, 1, NULL, 0, NULL) < 0) {
                zlog(ZLOG_ERROR, "kevent: unable to add event");
                return -1;
        }

        /* mark the event as registered */
        ev->index = ev->fd;
        return 0;
}
/* }}} */

/*
 * Remove a FD from the kevent queue
 */
static int fpm_event_kqueue_remove(struct fpm_event_s *ev) /* {{{ */
{
        struct kevent k;
        int flags = EV_DELETE;

        if (ev->flags & FPM_EV_EDGE) {
                        flags = flags | EV_CLEAR;
        }

        EV_SET(&k, ev->fd, EVFILT_READ, flags, 0, 0, (void *)ev);

        if (kevent(kfd, &k, 1, NULL, 0, NULL) < 0) {
                zlog(ZLOG_ERROR, "kevent: unable to add event");
                return -1;
        }

        /* mark the vent as not registered */
        ev->index = -1;
        return 0;
}
/* }}} */

#endif /* HAVE_KQUEUE */