/usr/include/kannel/gwlib/fdset.h is in kannel-dev 1.4.4-5.
This file is owned by root:root, with mode 0o644.
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* The Kannel Software License, Version 1.0
*
* Copyright (c) 2001-2014 Kannel Group
* Copyright (c) 1998-2001 WapIT Ltd.
* All rights reserved.
*
* 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 end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Kannel Group (http://www.kannel.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Kannel" and "Kannel Group" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please
* contact org@kannel.org.
*
* 5. Products derived from this software may not be called "Kannel",
* nor may "Kannel" appear in their name, without prior written
* permission of the Kannel Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 KANNEL GROUP OR ITS 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Kannel Group. For more information on
* the Kannel Group, please see <http://www.kannel.org/>.
*
* Portions of this software are based upon software originally written at
* WapIT Ltd., Helsinki, Finland for the Kannel project.
*/
/*
* fdset.h - module for managing a large collection of file descriptors
*/
typedef struct FDSet FDSet;
/*
* A function of this type will be called to indicate that a file descriptor
* has shown activity. The revents parameter is in the same format as
* returned by poll(). The data pointer was supplied by the caller who
* registered the fd with us in the first place.
* NOTE: Beware of concurrency issues. The callback function will run
* in the fdset's private thread, not in the caller's thread.
* This also means that if the callback does a lot of work it will slow
* down the polling process. This may be good or bad.
*/
typedef void fdset_callback_t(int fd, int revents, void *data);
/*
* Create a new, empty file descriptor set and start its thread.
* @timeout - idle timeout for any filedescriptor in this fdset after which
* callback function will be called with POLLERR as event.
*/
#define fdset_create() fdset_create_real(-1)
FDSet *fdset_create_real(long timeout);
/*
* Destroy a file descriptor set. Will emit a warning if any file
* descriptors are still registered with it.
*/
void fdset_destroy(FDSet *set);
/*
* Register a file descriptor with this set, and listen for the specified
* events (see fdset_listen() for details on that). Record the callback
* function which will be used to notify the caller about events.
*/
void fdset_register(FDSet *set, int fd, int events,
fdset_callback_t callback, void *data);
/*
* Change the set of events to listen for for this file descriptor.
* Events is in the same format as the events field in poll() -- in
* practice, use POLLIN for "input available", POLLOUT for "ready to
* accept more output", and POLLIN|POLLOUT for both.
*
* The mask field indicates which event flags can be affected. For
* example, if events is POLLIN and mask is POLLIN, then the POLLOUT
* setting will not be changed by this. If mask were POLLIN|POLLOUT,
* then the POLLOUT setting would be turned off.
*
* The fd must first have been registered. Locks are used to
* guarantee that the callback function will not be called for
* the old events after this function returns.
*/
void fdset_listen(FDSet *set, int fd, int mask, int events);
/*
* Forget about this fd. Locks are used to guarantee that the callback
* function will not be called for this fd after this function returns.
*/
void fdset_unregister(FDSet *set, int fd);
/**
* Set timeout in seconds for this FDSet.
*/
void fdset_set_timeout(FDSet *set, long timeout);
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