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568a417224
Require that all headers are guarded by a symbol named LIBVIRT_$FILENAME where $FILENAME is the uppercased filename, with all characters outside a-z changed into '_'. Note we do not use a leading __ because that is technically a namespace reserved for the toolchain. Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
131 lines
3.8 KiB
C
131 lines
3.8 KiB
C
/*
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* vireventpoll.h: Poll based event loop for monitoring file handles
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*
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* Copyright (C) 2007 Daniel P. Berrange
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* Copyright (C) 2007 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#ifndef LIBVIRT_VIREVENTPOLL_H
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# define LIBVIRT_VIREVENTPOLL_H
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# include "internal.h"
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/**
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* virEventPollAddHandle: register a callback for monitoring file handle events
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*
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* @fd: file handle to monitor for events
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* @events: bitset of events to watch from POLLnnn constants
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* @cb: callback to invoke when an event occurs
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* @opaque: user data to pass to callback
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*
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* returns -1 if the file handle cannot be registered, 0 upon success
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*/
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int virEventPollAddHandle(int fd, int events,
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virEventHandleCallback cb,
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void *opaque,
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virFreeCallback ff);
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/**
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* virEventPollUpdateHandle: change event set for a monitored file handle
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*
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* @watch: watch whose handle to update
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* @events: bitset of events to watch from POLLnnn constants
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*
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* Will not fail if fd exists
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*/
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void virEventPollUpdateHandle(int watch, int events);
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/**
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* virEventPollRemoveHandle: unregister a callback from a file handle
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*
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* @watch: watch whose handle to remove
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*
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* returns -1 if the file handle was not registered, 0 upon success
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*/
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int virEventPollRemoveHandle(int watch);
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/**
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* virEventPollAddTimeout: register a callback for a timer event
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*
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* @frequency: time between events in milliseconds
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* @cb: callback to invoke when an event occurs
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* @opaque: user data to pass to callback
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*
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* Setting frequency to -1 will disable the timer. Setting the frequency
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* to zero will cause it to fire on every event loop iteration.
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*
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* returns -1 if the file handle cannot be registered, a positive
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* integer timer id upon success
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*/
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int virEventPollAddTimeout(int frequency,
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virEventTimeoutCallback cb,
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void *opaque,
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virFreeCallback ff);
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/**
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* virEventPollUpdateTimeout: change frequency for a timer
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*
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* @timer: timer id to change
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* @frequency: time between events in milliseconds
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*
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* Setting frequency to -1 will disable the timer. Setting the frequency
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* to zero will cause it to fire on every event loop iteration.
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*
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* Will not fail if timer exists
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*/
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void virEventPollUpdateTimeout(int timer, int frequency);
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/**
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* virEventPollRemoveTimeout: unregister a callback for a timer
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*
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* @timer: the timer id to remove
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*
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* returns -1 if the timer was not registered, 0 upon success
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*/
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int virEventPollRemoveTimeout(int timer);
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/**
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* virEventPollInit: Initialize the event loop
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*
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* returns -1 if initialization failed
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*/
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int virEventPollInit(void);
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/**
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* virEventPollRunOnce: run a single iteration of the event loop.
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*
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* Blocks the caller until at least one file handle has an
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* event or the first timer expires.
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*
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* returns -1 if the event monitoring failed
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*/
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int virEventPollRunOnce(void);
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int virEventPollFromNativeEvents(int events);
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int virEventPollToNativeEvents(int events);
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/**
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* virEventPollInterrupt: wakeup any thread waiting in poll()
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*
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* return -1 if wakeup failed
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*/
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int virEventPollInterrupt(void);
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#endif /* LIBVIRT_VIREVENTPOLL_H */
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