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POSIX_FADVISE
Section: POSIX Programmer's Manual (3P)
Updated: 2003
Index
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PROLOG
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
NAME
posix_fadvise - file advisory information (ADVANCED REALTIME)
SYNOPSIS
#include <fcntl.h>
int posix_fadvise(int fd, off_t offset, size_t
len, int advice);
DESCRIPTION
The posix_fadvise() 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, fd,
starting at offset and continuing for len
bytes. The specified range need not currently exist in the file. If
len is zero, all data following offset is
specified. The implementation may use this information to optimize
handling of the specified data. The posix_fadvise()
function shall have no effect on the semantics of other operations
on the specified data, although it may affect the performance of
other operations.
The advice to be applied to the data is specified by the advice
parameter and may be one of the following values:
- POSIX_FADV_NORMAL
-
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.
- POSIX_FADV_SEQUENTIAL
-
Specifies that the application expects to access the specified data
sequentially from lower offsets to higher offsets.
- POSIX_FADV_RANDOM
-
Specifies that the application expects to access the specified data
in a random order.
- POSIX_FADV_WILLNEED
-
Specifies that the application expects to access the specified data
in the near future.
- POSIX_FADV_DONTNEED
-
Specifies that the application expects that it will not access the
specified data in the near future.
- POSIX_FADV_NOREUSE
-
Specifies that the application expects to access the specified data
once and then not reuse it thereafter.
These values are defined in <fcntl.h>.
RETURN VALUE
Upon successful completion, posix_fadvise() shall return zero;
otherwise, an error number shall be returned to indicate
the error.
ERRORS
The posix_fadvise() function shall fail if:
- EBADF
-
The fd argument is not a valid file descriptor.
- EINVAL
-
The value of advice is invalid.
- ESPIPE
-
The fd argument is associated with a pipe or FIFO.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
The posix_fadvise() function is part of the Advisory Information
option and need not be provided on all
implementations.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
posix_madvise(), the Base Definitions volume of IEEE Std 1003.1-2001,
<fcntl.h>
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 .
Index
- PROLOG
-
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- EXAMPLES
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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