/*      $OpenBSD: imsgev.h,v 1.3 2017/03/01 00:53:39 gsoares Exp $ */

/*
 * Copyright (c) 2009 Eric Faurot <eric@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef __IMSGEV_H__
#define __IMSGEV_H__

#include <event.h>
#include <imsg.h>

#define IMSG_LEN(m)     ((m)->hdr.len - IMSG_HEADER_SIZE)

struct imsgev {
        struct imsgbuf   ibuf;
        void            (*handler)(int, short, void *);
        struct event     ev;
        void            *data;
        short            events;
        int              terminate;
        void            (*callback)(struct imsgev *, int, struct imsg *);
        void            (*needfd)(struct imsgev *);
};

#define IMSGEV_IMSG     0
#define IMSGEV_DONE     1
#define IMSGEV_EREAD    2
#define IMSGEV_EWRITE   3
#define IMSGEV_EIMSG    4

void imsgev_init(struct imsgev *, int, void *, void (*)(struct imsgev *,
    int, struct imsg *), void (*)(struct imsgev *));
int  imsgev_compose(struct imsgev *, u_int16_t, u_int32_t, u_int32_t, int,
    void *, u_int16_t);
void imsgev_close(struct imsgev *);
void imsgev_clear(struct imsgev *);

#endif /* __IMSGEV_H__ */