HP-UX Reference (11i v2 03/08) - 5 Miscellaneous Topics, 7 Device (Special) Files, 9 General Information, Index (vol 9)

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glossary(9) glossary(9)
operation is indicated for each operation. Whether a particular process has these permis-
sions for an object is determined by the object’s permission mode bits as follows:
00400 Read by user
00200 Write by user
00060 Read, Write by group
00006 Read, Write by others
Read and Write permissions on a
msqid are granted to a process if one or more of the
following are true:
• The process’s effective user ID is superuser.
• The process’s effective user ID matches
msg_perm.[c]uid in the data structure
associated with
msqid and the appropriate bit of the ‘‘user’’ portion (0600) of
msg_perm.mode is set.
• The process’s effective user ID does not match
msg_perm.[c]uid and either
the process’s effective group ID matches
msg_perm.[c]gid or one of
msg_perm.[c]gid is in the process’s group access list and the appropriate bit
of the ‘‘group’’ portion (00060) of
msg_perm.mode
is set.
• The process’s effective user ID does not match
msg_perm.[c]uid
and the
process’s effective group ID does not match
msg_perm.[c]gid and neither of
msg_perm.[c]gid is in the process’s group access list and the appropriate bit
of the ‘‘other’’ portion (06) of msg_perm.mode
is set.
Otherwise, the corresponding permissions are denied.
metacharacter
A character that has special meaning to the HP-UX shell, as well as to commands such as
ed, find, and grep (see ed(1), find(1), and grep(1)). The set of metacharacters
includes: !, ", &, ’, *, ;, <, >,
?, [, ], ‘, and |. Refer to sh(1) and the related shell
manual entries for the meaning associated with each. See also regular expression.
minor number
A number that is an attribute of special files, specified during their creation and used
whenever they are accessed, to enable I/O to or from specific devices. This number is
passed to the device driver and is used to select which device in a family of devices is to
be used, and possibly some operational modes. The exact format and meaning of the
minor number is both system and driver dependent. Refer to the System Administrator
manuals supplied with your system for details.
On Series 700 systems, a minor number indicates the device address, function number,
and driver-dependent bits. On Series 800 systems, a minor number is an index into a
table in the kernel.
mode A 16-bit word associated with every file in the file system, stored in the inode. The
least-significant 12 bits of the mode determine the read, write, and execute permissions
for the file owner, file group, and all others, and contain the set-user-ID, set-group-ID,
and ‘‘sticky’’ (save text image after execution) bits. The least-significant 12 bits can be set
by the chmod(1) command if you are the file’s owner or the superuser. The sticky bit on a
regular file can only be set by the superuser. These 12 bits are sometimes referred to as
permission bits. The most-significant 4 bits specify the file type for the associated file
and are set as the result of open(2) or mknod(2) system calls.
mountable file system
A removable blocked file system contained on some mass storage medium with its own
root directory and an independent hierarchy of directories and files. See block special
file and mount(1M).
msqid See message queue identifier.
multiuser state
The condition of the HP-UX operating system in which terminals (in addition to the sys-
tem console) allow communication between the system and its users. By convention, mul-
tiuser run level is set at state 2, which is usually defined to contain all the terminal
processes and daemons needed in a multiuser environment. Run levels are table driven,
and are specified by init(1M), which sets the run level by looking at the file
HP-UX 11i Version 2: August 2003 − 12 − Hewlett-Packard Company Section 9−−13