On Apache/1.3.41 (Unix) PHP/5.2.5 mod_perl/1.30 mod_gzip/1.3.26.1a
Under GNU General Public License
2009-01-10 10:19 @38.103.63.58 CrawledBy CCBot/1.0 (+http://www.commoncrawl.org/bot.html)
POSIX_FADVISE(P) POSIX_FADVISE(P)
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 behav-
ior 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 fol-
lowing 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 sequen-
tially 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 .
POSIX 2003 POSIX_FADVISE(P)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache/1.3.41 (Unix) PHP/5.2.5 mod_perl/1.30 mod_gzip/1.3.26.1a
Under GNU General Public License
2009-01-10 10:19 @38.103.63.58 CrawledBy CCBot/1.0 (+http://www.commoncrawl.org/bot.html)