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/*
* Copyright (C) 2013 The Android Open Source Project
* All rights reserved.
*
* 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.
*
* 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 OWNER 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.
*/
#pragma once
/**
* @file sys/timerfd.h
* @brief Timer file descriptors.
*/
#include <fcntl.h> /* For O_CLOEXEC and O_NONBLOCK. */
#include <time.h>
#include <sys/cdefs.h>
#include <sys/types.h>
__BEGIN_DECLS
/** The timerfd_create() flag for a close-on-exec file descriptor. */
#define TFD_CLOEXEC O_CLOEXEC
/** The timerfd_create() flag for a non-blocking file descriptor. */
#define TFD_NONBLOCK O_NONBLOCK
/**
* [timerfd_create(2)](http://man7.org/linux/man-pages/man2/timerfd_create.2.html) creates a
* timer file descriptor.
*
* Returns the new file descriptor on success, and returns -1 and sets `errno` on failure.
*
* Available since API level 19.
*/
int timerfd_create(clockid_t __clock, int __flags) __INTRODUCED_IN(19);
/** The timerfd_settime() flag to use absolute rather than relative times. */
#define TFD_TIMER_ABSTIME (1 << 0)
/** The timerfd_settime() flag to cancel an absolute timer if the realtime clock changes. */
#define TFD_TIMER_CANCEL_ON_SET (1 << 1)
/**
* [timerfd_settime(2)](http://man7.org/linux/man-pages/man2/timerfd_settime.2.html) starts or
* stops a timer.
*
* Returns 0 on success, and returns -1 and sets `errno` on failure.
*
* Available since API level 19.
*/
int timerfd_settime(int __fd, int __flags, const struct itimerspec* __new_value, struct itimerspec* __old_value) __INTRODUCED_IN(19);
/**
* [timerfd_gettime(2)](http://man7.org/linux/man-pages/man2/timerfd_gettime.2.html) queries the
* current timer settings.
*
* Returns 0 on success, and returns -1 and sets `errno` on failure.
*
* Available since API level 19.
*/
int timerfd_gettime(int __fd, struct itimerspec* __current_value) __INTRODUCED_IN(19);
__END_DECLS
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