NonStop S-Series Hardware Installation and FastPath Guide (G06.25+)

Glossary
HP NonStop S-Series Hardware Installation and FastPath Guide—529443-001
Glossary-37
file
file. An object to which data can be written or from which data can be read. A file has
attributes such as access permissions and a file type. In the Open System Services
(OSS) environment, file types include regular file, character special file, block special
file, FIFO, and directory. In the Guardian environment, file types include disk files,
processes, and subdevices.
file class. The property of an Open System Services (OSS) file indicating access
permissions for a process related to the owner, group, or other identification of the
process. See also file group class, file other class, and file owner class.
file description. See open file description.
file descriptor. In the Open System Services (OSS) file system, the nonnegative integer
that uniquely identifies a single open of a file to a running process. Each file descriptor
is associated with an open file description that contains data about the file.
file group class. The property of an Open System Services (OSS) file indicating access
permissions for a process related to the group ID of the process. A process is in the file
group class of a file if both:
•
The process is not a member of the file owner class for the file.
•
The process has an effective group ID or supplementary group ID that is the same
as the group ID associated with the file.
file identifier. In the Guardian environment, the portion of a filename following the
subvolume name. In the Open System Services (OSS) environment, a file identifier is a
portion of the internal information used to identify a file in the OSS file system (an
inode number). The two identifiers are not comparable.
file link count. The total number of directory entries for an Open System Services (OSS)
file within an Expand node.
file mode. For an Open System Services (OSS) process, a field in the stat structure for a
specific file that describes the type and characteristics of the file and contains the
access permission bits for the file.
file mode creation mask. A mask associated with an Open System Services (OSS)
process and used when the process creates a file. Bits set in this mask are cleared in
the access permission bits for the file.
filename. In the Open System Services (OSS) environment, a component of a pathname
containing any valid characters other than slash (/) or null. See also file name.
file name. A string of characters that uniquely identifies a file.
In the PC environment, file names for disk files normally have at least two parts (the
disk name and the file name); for example, B:MYFILE.