/usr/include/linux/fadvise.h is in linux-libc-dev 4.15.0-20.21.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef FADVISE_H_INCLUDED
#define FADVISE_H_INCLUDED
#define POSIX_FADV_NORMAL 0 /* No further special treatment. */
#define POSIX_FADV_RANDOM 1 /* Expect random page references. */
#define POSIX_FADV_SEQUENTIAL 2 /* Expect sequential page references. */
#define POSIX_FADV_WILLNEED 3 /* Will need these pages. */
/*
* The advise values for POSIX_FADV_DONTNEED and POSIX_ADV_NOREUSE
* for s390-64 differ from the values for the rest of the world.
*/
#if defined(__s390x__)
#define POSIX_FADV_DONTNEED 6 /* Don't need these pages. */
#define POSIX_FADV_NOREUSE 7 /* Data will be accessed once. */
#else
#define POSIX_FADV_DONTNEED 4 /* Don't need these pages. */
#define POSIX_FADV_NOREUSE 5 /* Data will be accessed once. */
#endif
#endif /* FADVISE_H_INCLUDED */
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