mini_event.h

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/*
 * mini-event.h - micro implementation of libevent api, using select() only.
 *
 * Copyright (c) 2007, NLnet Labs. All rights reserved.
 * 
 * This software is open source.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * 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.
 * 
 * Neither the name of the NLNET LABS nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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 COPYRIGHT
 * HOLDER OR CONTRIBUTORS 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.
 */

 
#ifndef MINI_EVENT_H
#define MINI_EVENT_H
 
#if defined(USE_MINI_EVENT) && !defined(USE_WINSOCK)
 
#ifndef HAVE_EVENT_BASE_FREE
#define HAVE_EVENT_BASE_FREE
#endif 
 
/* redefine to use our own namespace so that on platforms where
 * linkers crosslink library-private symbols with other symbols, it works */
#define event_init minievent_init
#define event_get_version minievent_get_version
#define event_get_method minievent_get_method
#define event_base_dispatch minievent_base_dispatch
#define event_base_loopexit minievent_base_loopexit
#define event_base_free minievent_base_free
#define event_set minievent_set
#define event_base_set minievent_base_set
#define event_add minievent_add
#define event_del minievent_del
#define signal_add minisignal_add
#define signal_del minisignal_del

#define EV_TIMEOUT  0x01
#define EV_READ     0x02
#define EV_WRITE    0x04
#define EV_SIGNAL   0x08
#define EV_PERSIST  0x10
 
/* needs our redblack tree */
#include "rbtree.h"

#define MAX_FDS 1024
#define MAX_SIG 32

struct event_base
{
    rbtree_type* times;
    struct event** fds;
    int maxfd;
    int capfd;
    /* fdset for read write, for fds ready, and added */
    fd_set 
        reads, 
        writes, 
        ready, 
        content;
    struct event** signals;
    int need_to_exit;
    time_t* time_secs;
    struct timeval* time_tv;
};

struct event {
    rbnode_type node;
    int added;

    struct event_base *ev_base;
    int ev_fd;
    short ev_events;
    struct timeval ev_timeout;

    void (*ev_callback)(int, short, void *arg);
    void *ev_arg;
};
 
/* function prototypes (some are as they appear in event.h) */
void *event_init(time_t* time_secs, struct timeval* time_tv);
const char *event_get_version(void);
const char *event_get_method(void);
int event_base_dispatch(struct event_base *);
int event_base_loopexit(struct event_base *, struct timeval *);
void event_base_free(struct event_base *);
void event_set(struct event *, int, short, void (*)(int, short, void *), void *);
int event_base_set(struct event_base *, struct event *);
int event_add(struct event *, struct timeval *);
int event_del(struct event *);

#define evtimer_add(ev, tv)             event_add(ev, tv)
#define evtimer_del(ev)                 event_del(ev)
 
/* uses different implementation. Cannot mix fd/timeouts and signals inside
 * the same struct event. create several event structs for that.  */
int signal_add(struct event *, struct timeval *);
#define signal_set(ev, x, cb, arg)      \
        event_set(ev, x, EV_SIGNAL|EV_PERSIST, cb, arg)
int signal_del(struct event *);
 
#endif /* USE_MINI_EVENT and not USE_WINSOCK */

int mini_ev_cmp(const void* a, const void* b);
 
#endif /* MINI_EVENT_H */