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/*
* Copyright (c) 2007-2010 Niels Provos and Nick Mathewson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 _EVMAP_H_
#define _EVMAP_H_

/** @file evmap-internal.h
*
* An event_map is a utility structure to map each fd or signal to zero or
* more events. Functions to manipulate event_maps should only be used from
* inside libevent. They generally need to hold the lock on the corresponding
* event_base.
**/

struct event_base;
struct event;

/** Initialize an event_map for use.
*/
void evmap_io_initmap(struct event_io_map* ctx);
void evmap_signal_initmap(struct event_signal_map* ctx);

/** Remove all entries from an event_map.

@param ctx the map to clear.
*/
void evmap_io_clear(struct event_io_map* ctx);
void evmap_signal_clear(struct event_signal_map* ctx);

/** Add an IO event (some combination of EV_READ or EV_WRITE) to an
event_base's list of events on a given file descriptor, and tell the
underlying eventops about the fd if its state has changed.

Requires that ev is not already added.

@param base the event_base to operate on.
@param fd the file descriptor corresponding to ev.
@param ev the event to add.
*/
int evmap_io_add(struct event_base *base, evutil_socket_t fd, struct event *ev);
/** Remove an IO event (some combination of EV_READ or EV_WRITE) to an
event_base's list of events on a given file descriptor, and tell the
underlying eventops about the fd if its state has changed.

@param base the event_base to operate on.
@param fd the file descriptor corresponding to ev.
@param ev the event to remove.
*/
int evmap_io_del(struct event_base *base, evutil_socket_t fd, struct event *ev);
/** Active the set of events waiting on an event_base for a given fd.

@param base the event_base to operate on.
@param fd the file descriptor that has become active.
@param events a bitmask of EV_READ|EV_WRITE|EV_ET.
*/
void evmap_io_active(struct event_base *base, evutil_socket_t fd, short events);


/* These functions behave in the same way as evmap_io_*, except they work on
* signals rather than fds. signals use a linear map everywhere; fds use
* either a linear map or a hashtable. */
int evmap_signal_add(struct event_base *base, int signum, struct event *ev);
int evmap_signal_del(struct event_base *base, int signum, struct event *ev);
void evmap_signal_active(struct event_base *base, evutil_socket_t signum, int ncalls);

void *evmap_io_get_fdinfo(struct event_io_map *ctx, evutil_socket_t fd);

#endif /* _EVMAP_H_ */
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