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/*
* util/ub_event.h - indirection layer for pluggable events
*
* 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.
*/
/**
* \file
*
* This file contains prototypes for event loop functions.
*
*/
#ifndef UB_EVENT_H
#define UB_EVENT_H
struct ub_event_base;
struct ub_event;
struct comm_base;
struct event_base;
/** event timeout */
#define UB_EV_TIMEOUT 0x01
/** event fd readable */
#define UB_EV_READ 0x02
/** event fd writable */
#define UB_EV_WRITE 0x04
/** event signal */
#define UB_EV_SIGNAL 0x08
/** event must persist */
#define UB_EV_PERSIST 0x10
/** Returns event-base type. Could be "mini-event", "winsock-event" for the
* daemon compile, and will be "pluggable-event<PACKAGE_VERSION>" for
* libunbound.
*/
const char* ub_event_get_version(void);
/** Return the name, system and method for the pluggable event base */
void ub_get_event_sys(struct ub_event_base*, const char** n, const char** s,
const char** m);
/** Return a default event base. In the deamon thess will be the only event
* bases used.
*/
struct ub_event_base* ub_default_event_base(int, time_t*, struct timeval*);
/** Return an ub_event_base constructed for the given libevent event base */
struct ub_event_base* ub_libevent_event_base(struct event_base*);
/** Return the libevent base underlying the given ub_event_base. Will return
* NULL when the ub_event_base does not have an underlying libevent event base
*/
struct event_base* ub_libevent_get_event_base(struct ub_event_base*);
/** Free event base. Free events yourself */
void ub_event_base_free(struct ub_event_base*);
/** Run the event base */
int ub_event_base_dispatch(struct ub_event_base*);
/** exit that loop */
int ub_event_base_loopexit(struct ub_event_base*);
/** Create a new ub_event for the event base */
struct ub_event* ub_event_new(struct ub_event_base*,
int fd, short bits, void (*cb)(int, short, void*), void* arg);
/** Create a new ub_event signal for the event base */
struct ub_event* ub_signal_new(struct ub_event_base*, int fd,
void (*cb)(int, short, void*), void* arg);
/** Create a new ub_event associated with the wsaevent for the event base */
struct ub_event* ub_winsock_register_wsaevent(struct ub_event_base*,
void* wsaevent, void (*cb)(int, short, void*), void* arg);
/** Add event bits for this event to fire on */
void ub_event_add_bits(struct ub_event*, short bits);
/** Configure the event so it will not longer fire on given bits */
void ub_event_del_bits(struct ub_event*, short bits);
/** Change or set the file descriptor on the event */
void ub_event_set_fd(struct ub_event*, int fd);
/** free the event */
void ub_event_free(struct ub_event*);
/** Activate the event. The given timeval is an timeout value. */
int ub_event_add(struct ub_event*, struct timeval*);
/** Deactivate the event */
int ub_event_del(struct ub_event*);
/** Reconfigure and activate a timeout event */
int ub_timer_add(struct ub_event*, struct ub_event_base*,
void (*cb)(int, short, void*), void* arg, struct timeval*);
/** Deactivate the timeout event */
int ub_timer_del(struct ub_event*);
/** Activate a signal event */
int ub_signal_add(struct ub_event*, struct timeval*);
/** Deactivate a signal event */
int ub_signal_del(struct ub_event*);
/** Free a with a wsaevent associated event */
void ub_winsock_unregister_wsaevent(struct ub_event* ev);
/** Signal the eventloop when a TCP windows socket will block on next read
* or write (given by the eventbits)
*/
void ub_winsock_tcp_wouldblock(struct ub_event*, int bits);
/** Equip the comm_base with the current time */
void ub_comm_base_now(struct comm_base* cb);
#endif /* UB_EVENT_H */
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