|POSIX_FADVISE(3P)||POSIX Programmer's Manual||POSIX_FADVISE(3P)|
PROLOGThis 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.
NAMEposix_fadvise - file advisory information ( ADVANCED REALTIME)
DESCRIPTIONThe 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:
These values are defined in <fcntl.h>.
RETURN VALUEUpon successful completion, posix_fadvise() shall return zero; otherwise, an error number shall be returned to indicate the error.
ERRORSThe posix_fadvise() function shall fail if:
- The fd argument is not a valid file descriptor.
- The value of advice is invalid.
fd argument is associated with a pipe or FIFO.
The following sections are informative.
APPLICATION USAGEThe posix_fadvise() function is part of the Advisory Information option and need not be provided on all implementations.
SEE ALSOposix_madvise(), the Base Definitions volume of IEEE Std 1003.1-2001, <fcntl.h>
COPYRIGHTPortions 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 .
|2003||IEEE/The Open Group|