here - OSTA - Optical Storage Technology Association

would be considered writable if the logical OR of OWNER_Write,
GROUP_Write and OTHER_Write was equal to one.
When setting a specific permission the implementation should set all three
(owner, group, other) sets of permission bits. For example to mark a file
as writable the OWNER_Write, GROUP_Write and OTHER_Write
should all be set to one.
Default Permission Values
For the operating systems covered by this document the following table describes
what default values should be used for permission bits that do not directly map to
an operating system supported permission bit when creating a new file.
Permissio
n
File/Director
y
Description DOS OS/2 Win
95
Win
NT
Mac
OS
UNIX &
OS/400
Read file The file may be read 1 1 1 1 1 U
Read directory The directory may be read, only if the
1 1 1 1 1 U
directory is also marked as Execute.
Write file The file’s contents may be modified U U U U U U
Write directory Files or subdirectories may be renamed, U U U U U U
added, or deleted, only if the directory is also
marked as Execute.
Execute file The file may be executed. 0 0 0 0 0 U
Execute directory The directory may be searched for a specific 1 1 1 1 1 U
file or subdirectory.
Attribute file The file’s permissions may be changed. 1 1 1 1 1 Note 1
Attribute directory The directory’s permissions may be changed. 1 1 1 1 1 Note 1
Delete file The file may be deleted. Note 2 Note 2 Note Note 2 Note 2 Note 2
2
Delete directory The directory may be deleted. Note 2 Note 2 Note Note 2 Note 2 Note 2
2
U - User Specified, 1 - Set, 0 - Clear
NOTE 1: Under UNIX only the owner of a file/directory may change its
attributes. Under OS/400 if a file or directory is marked as writable (Write
permission set) then the Attribute permission bit should be set.
NOTE 2: The Delete permission bit should be set based upon the status of the
Write permission bit. Under DOS, OS/2 and Macintosh, if a file or directory is
marked as writable (Write permission set) then the file is considered deletable and
the Delete permission bit should be set. If a file is read only then the Delete
permission bit should not be set. This applies to file create as well as changing
attributes of a file.
Processing Permissions
Implementation shall process the permission bits according to the following table
that describes how to process the permission bits under the operating systems
covered by this document. The table addresses the issues associated with
permission bits that do not directly map to an operating system supported
permission bit.
UDF 2.01
73
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