view include/subscriberfuncs.h @ 843:2ea56ea4bd34

Add ability to subscribe to 'both' and avoid a deadlock when switching. - 'both' means normal and digest versions simultaneously; information about this feature is not included in the default list texts, but a few power users find it helpful. - Only take out locks when actually performing a subscription, not before checking whether the address is already subscribed; we only really need it when we are actually changing the file, and there is a potential deadlock which could occur while waiting for unsubscription to complete as part of a switch if the lock is taken earlier. - Also moved code which sends unsubscription confirmations so that it only runs once, after unsubsciption has been completed, not every time the address is removed; this is only really important when 'both' is a realistic subscription option, but it could avoid other double-sends as well.
author Ben Schmidt
date Wed, 25 Jan 2012 22:34:57 +1100
parents 0f8242ffa2d0
children
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/* Copyright (C) 2003 Mads Martin Joergensen <mmj at mmj.dk>
 *
 * $Id$
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#ifndef SUBSCRIBERFUNC_H
#define SUBSCRIBERFUNC_H

off_t find_subscriber(int fd, const char *address);
int is_subbed_in(const char *subddirname, const char *address);
enum subtype is_subbed(const char *listdir, const char *address, int both);

#endif /* SUBSCRIBERFUNC_H */