04-22-2013
Thanks for your answers;
Also got a hint that there is an open feature request:
Bug 15466549 : SUNBT6678044 MIRROR CHILD SELECTION SHOULD BE SMARTER
gP
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LEARN ABOUT NETBSD
posix_fadvise
POSIX_FADVISE(2) BSD System Calls Manual POSIX_FADVISE(2)
NAME
posix_fadvise -- hint at the future access pattern of a file
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/fcntl.h>
int
posix_fadvise(int fd, off_t offset, off_t size, int hint);
DESCRIPTION
posix_fadvise() hints at the application's access pattern to the file and range given by the file descriptor, fd, and offset and size. If
size is zero, it means to the end of file.
hint should be one of the followings.
POSIX_FADV_NORMAL No hint. (default)
POSIX_FADV_RANDOM Random access.
POSIX_FADV_SEQUENTIAL Sequential access. (from lower offset to higher offset.)
POSIX_FADV_WILLNEED Will be accessed.
POSIX_FADV_DONTNEED Will not be accessed.
POSIX_FADV_NOREUSE Will be accessed just once.
Calling posix_fadvise() doesn't alter the semantics of the operations, it is only a matter of performance.
RETURN VALUES
On success, posix_fadvise() returns 0. Otherwise, it returns an error number.
SEE ALSO
errno(2), madvise(2)
BUGS
For POSIX_FADV_NORMAL, POSIX_FADV_RANDOM, and POSIX_FADV_SEQUENTIAL, the current implementation ignores offset and size, and applies the hint
to the whole file.
BSD
June 9, 2009 BSD