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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "POSIX_FADVISE" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" posix_fadvise 
+.SH NAME
+posix_fadvise \- file advisory information (\fBADVANCED REALTIME\fP)
+.SH SYNOPSIS
+.LP
+\fB#include <fcntl.h>
+.br
+.sp
+int posix_fadvise(int\fP \fIfd\fP\fB, off_t\fP \fIoffset\fP\fB, size_t\fP
+\fIlen\fP\fB, int\fP \fIadvice\fP\fB);
+\fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIposix_fadvise\fP() function shall advise the implementation
+on the expected behavior of the application with respect to
+the data in the file associated with the open file descriptor, \fIfd\fP,
+starting at \fIoffset\fP and continuing for \fIlen\fP
+bytes. The specified range need not currently exist in the file. If
+\fIlen\fP is zero, all data following \fIoffset\fP is
+specified. The implementation may use this information to optimize
+handling of the specified data. The \fIposix_fadvise\fP()
+function shall have no effect on the semantics of other operations
+on the specified data, although it may affect the performance of
+other operations.
+.LP
+The advice to be applied to the data is specified by the \fIadvice\fP
+parameter and may be one of the following values:
+.TP 7
+POSIX_FADV_NORMAL
+.sp
+Specifies that the application has no advice to give on its behavior
+with respect to the specified data. It is the default
+characteristic if no advice is given for an open file.
+.TP 7
+POSIX_FADV_SEQUENTIAL
+.sp
+Specifies that the application expects to access the specified data
+sequentially from lower offsets to higher offsets.
+.TP 7
+POSIX_FADV_RANDOM
+.sp
+Specifies that the application expects to access the specified data
+in a random order.
+.TP 7
+POSIX_FADV_WILLNEED
+.sp
+Specifies that the application expects to access the specified data
+in the near future.
+.TP 7
+POSIX_FADV_DONTNEED
+.sp
+Specifies that the application expects that it will not access the
+specified data in the near future.
+.TP 7
+POSIX_FADV_NOREUSE
+.sp
+Specifies that the application expects to access the specified data
+once and then not reuse it thereafter.
+.sp
+.LP
+These values are defined in \fI<fcntl.h>\fP.
+.SH RETURN VALUE
+.LP
+Upon successful completion, \fIposix_fadvise\fP() shall return zero;
+otherwise, an error number shall be returned to indicate
+the error.
+.SH ERRORS
+.LP
+The \fIposix_fadvise\fP() function shall fail if:
+.TP 7
+.B EBADF
+The \fIfd\fP argument is not a valid file descriptor.
+.TP 7
+.B EINVAL
+The value of \fIadvice\fP is invalid.
+.TP 7
+.B ESPIPE
+The \fIfd\fP argument is associated with a pipe or FIFO.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+The \fIposix_fadvise\fP() function is part of the Advisory Information
+option and need not be provided on all
+implementations.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIposix_madvise\fP() , the Base Definitions volume of IEEE\ Std\ 1003.1-2001,
+\fI<fcntl.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .