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118 lines
4.8 KiB
118 lines
4.8 KiB
/*
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* Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef EVMAP_INTERNAL_H_INCLUDED_
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#define EVMAP_INTERNAL_H_INCLUDED_
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/** @file evmap-internal.h
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*
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* An event_map is a utility structure to map each fd or signal to zero or
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* more events. Functions to manipulate event_maps should only be used from
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* inside libevent. They generally need to hold the lock on the corresponding
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* event_base.
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**/
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struct event_base;
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struct event;
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/** Initialize an event_map for use.
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*/
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void evmap_io_initmap_(struct event_io_map* ctx);
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void evmap_signal_initmap_(struct event_signal_map* ctx);
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/** Remove all entries from an event_map.
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@param ctx the map to clear.
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*/
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void evmap_io_clear_(struct event_io_map* ctx);
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void evmap_signal_clear_(struct event_signal_map* ctx);
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/** Add an IO event (some combination of EV_READ or EV_WRITE) to an
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event_base's list of events on a given file descriptor, and tell the
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underlying eventops about the fd if its state has changed.
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Requires that ev is not already added.
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@param base the event_base to operate on.
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@param fd the file descriptor corresponding to ev.
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@param ev the event to add.
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*/
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int evmap_io_add_(struct event_base *base, evutil_socket_t fd, struct event *ev);
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/** Remove an IO event (some combination of EV_READ or EV_WRITE) to an
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event_base's list of events on a given file descriptor, and tell the
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underlying eventops about the fd if its state has changed.
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@param base the event_base to operate on.
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@param fd the file descriptor corresponding to ev.
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@param ev the event to remove.
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*/
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int evmap_io_del_(struct event_base *base, evutil_socket_t fd, struct event *ev);
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/** Active the set of events waiting on an event_base for a given fd.
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@param base the event_base to operate on.
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@param fd the file descriptor that has become active.
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@param events a bitmask of EV_READ|EV_WRITE|EV_ET.
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*/
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void evmap_io_active_(struct event_base *base, evutil_socket_t fd, short events);
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/* These functions behave in the same way as evmap_io_*, except they work on
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* signals rather than fds. signals use a linear map everywhere; fds use
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* either a linear map or a hashtable. */
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int evmap_signal_add_(struct event_base *base, int signum, struct event *ev);
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int evmap_signal_del_(struct event_base *base, int signum, struct event *ev);
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void evmap_signal_active_(struct event_base *base, evutil_socket_t signum, int ncalls);
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/* Return the fdinfo object associated with a given fd. If the fd has no
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* events associated with it, the result may be NULL.
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*/
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void *evmap_io_get_fdinfo_(struct event_io_map *ctx, evutil_socket_t fd);
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/* Helper for event_reinit(): Tell the backend to re-add every fd and signal
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* for which we have a pending event.
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*/
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int evmap_reinit_(struct event_base *base);
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/* Helper for event_base_free(): Call event_del() on every pending fd and
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* signal event.
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*/
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void evmap_delete_all_(struct event_base *base);
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/* Helper for event_base_assert_ok_(): Check referential integrity of the
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* evmaps.
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*/
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void evmap_check_integrity_(struct event_base *base);
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/* Helper: Call fn on every fd or signal event, passing as its arguments the
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* provided event_base, the event, and arg. If fn returns 0, process the next
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* event. If it returns any other value, return that value and process no
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* more events.
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*/
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int evmap_foreach_event_(struct event_base *base,
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event_base_foreach_event_cb fn,
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void *arg);
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#endif /* EVMAP_INTERNAL_H_INCLUDED_ */
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