83 lines
3 KiB
C
83 lines
3 KiB
C
/*
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* Copyright (C) 2013 The Android Open Source Project
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* All rights reserved.
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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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* * 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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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#pragma once
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/**
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* @file sys/timerfd.h
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* @brief Timer file descriptors.
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*/
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#include <fcntl.h> /* For O_CLOEXEC and O_NONBLOCK. */
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#include <time.h>
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#include <sys/cdefs.h>
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#include <sys/types.h>
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__BEGIN_DECLS
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/** The timerfd_create() flag for a close-on-exec file descriptor. */
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#define TFD_CLOEXEC O_CLOEXEC
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/** The timerfd_create() flag for a non-blocking file descriptor. */
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#define TFD_NONBLOCK O_NONBLOCK
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/**
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* [timerfd_create(2)](http://man7.org/linux/man-pages/man2/timerfd_create.2.html) creates a
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* timer file descriptor.
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*
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* Returns the new file descriptor on success, and returns -1 and sets `errno` on failure.
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*
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* Available since API level 19.
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*/
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int timerfd_create(clockid_t __clock, int __flags) __INTRODUCED_IN(19);
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/** The timerfd_settime() flag to use absolute rather than relative times. */
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#define TFD_TIMER_ABSTIME (1 << 0)
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/** The timerfd_settime() flag to cancel an absolute timer if the realtime clock changes. */
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#define TFD_TIMER_CANCEL_ON_SET (1 << 1)
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/**
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* [timerfd_settime(2)](http://man7.org/linux/man-pages/man2/timerfd_settime.2.html) starts or
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* stops a timer.
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*
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* Returns 0 on success, and returns -1 and sets `errno` on failure.
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*
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* Available since API level 19.
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*/
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int timerfd_settime(int __fd, int __flags, const struct itimerspec* __new_value, struct itimerspec* __old_value) __INTRODUCED_IN(19);
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/**
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* [timerfd_gettime(2)](http://man7.org/linux/man-pages/man2/timerfd_gettime.2.html) queries the
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* current timer settings.
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*
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* Returns 0 on success, and returns -1 and sets `errno` on failure.
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*
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* Available since API level 19.
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*/
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int timerfd_gettime(int __fd, struct itimerspec* __current_value) __INTRODUCED_IN(19);
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__END_DECLS
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