HP-UX Reference (11i v1 00/12) - 4 File Formats (vol 8)
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STANDARD Printed by: Nora Chuang [nchuang] STANDARD
/build/1111/BRICK/man4/!!!intro.4
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c
cdnode(4) cdnode(4)
NAME
cdnode - format of a CDFS cdnode
SYNOPSIS
#include <sys/types.h>
#include <sys/cdnode.h>
DESCRIPTION
This entry describes the cdnode structure and related concepts for the CDFS file system. Refer to other
inode(4) manual pages for information regarding the inode structure for other file systems.
The CDFS file system does not have the concept of a separate entity called an inode. The information nor-
mally found in an HFS inode is kept in a cdnode data structure. However, the cdnode data structure does
not reside on the physical media, but instead is kept in kernel memory space only. The cdnode information
is used to uniquely identify a file.
The information kept in the cdnode structure is obtained from two other data structures in the CDFS file
system:
1. Directory record for the file or directory, and
2. Extended attribute record
(XAR) for the file or directory, if one exists.
Because few files usually have
XARs associated with them, the cdnode information most often consists only
of attributes given by the directory record for the file.
Since cdnodes are kept in kernel memory, they cannot be directly accessed by the user. The stat()
sys-
tem call attempts to map whatever information is included in the cdnode for a given file into the standard
stat structure (see stat(2)). However, since a cdnode includes information that does not have corresponding
fields in the stat structure, that information cannot be mapped and therefore cannot be accessed. No
method is provided to access an entire cdnode structure.
FILES
/usr/include/sys/cdnode.h
/usr/include/sys/cdfsdir.h
SEE ALSO
stat(2), cdrom(4), cdfsdir(4).
Section 4−−32 − 1 − HP-UX Release 11i: December 2000
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