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68 lines
2.4 KiB
68 lines
2.4 KiB
/*
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* Copyright (C) 2016 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 bits/lockf.h
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* @brief The lockf() function.
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*/
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#include <sys/cdefs.h>
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#include <sys/types.h>
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/** lockf() command to unlock a section of a file. */
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#define F_ULOCK 0
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/** lockf() command to block until it locks a section of a file. */
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#define F_LOCK 1
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/** lockf() command to try to lock a section of a file. */
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#define F_TLOCK 2
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/** lockf() command to test whether a section of a file is unlocked (or locked by the caller). */
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#define F_TEST 3
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__BEGIN_DECLS
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/**
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* [lockf(3)](http://man7.org/linux/man-pages/man3/lockf.3.html) manipulates POSIX file locks.
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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 24.
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*
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* See also flock().
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*/
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int lockf(int __fd, int __cmd, off_t __length) __RENAME_IF_FILE_OFFSET64(lockf64) __INTRODUCED_IN(24);
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/**
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* Like lockf() but allows using a 64-bit length
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* even from a 32-bit process without `__FILE_OFFSET_BITS=64`.
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*/
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int lockf64(int __fd, int __cmd, off64_t __length) __INTRODUCED_IN(24);
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__END_DECLS
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