glossary.9 (2010 09)

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glossary(9) glossary(9)
attached. shm_atime is the time of the last
shmat operation, shm_dtime is the time of the last
shmdt operation, and shm_ctime is the time of the last shmctl (2) operation that changed one of the
members of the above structure.
shared memory operation permissions
In the shmop (2) and shmctl (2) system call descriptions, the permission required for an operation is indi-
cated for each operation. Whether a particular process has the permission to perform a shmop (2) or
shmctl (2) operation on 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 for a shmop(2) or shmctl (2) operation on a shared memory identifier
(shmid) 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
shm_perm.[c]uid in the data structure associated with
the shmid and the appropriate bit of the "user" portion (0600) of
shm_perm.mode
is set.
• The process’s effective user ID does not match
shm_perm.[c]uid and either the process’s effective
group ID matches
shm_perm.[c]gid or one of shm_perm.[c]gid
is in the process’s group access
list and the appropriate bit of the "group" portion (060) of
shm_perm.mode is set.
• The process’s effective user ID does not match
shm_perm.[c]uid and the process’s effective group
ID does not match
shm_perm.[c]gid and neither of shm_perm.[c]
gid is in the process’s group
access list and the appropriate bit of the "other" portion (06) of
shm_perm.mode is set.
Otherwise, the corresponding permissions are denied.
shell
A user interface to the HP-UX operating system. A shell often functions as both a command interpreter
and an interpretive programming language. A shell is automatically invoked for every user who logs in.
See sh(1) and its related manual entries plus the tutorials supplied with your system for details.
shell program
See shell script.
shell script
A sequence of shell commands and shell programming language constructs stored in a file and invoked as
a user command (program). No compilation is needed prior to execution because the shell recognizes the
commands and constructs that make up the shell programming language. A shell script is often called a
shell program or a command file. See the Shells User Guide.
shmid
See shared memory identifier.
signal
A software interrupt sent to a process, informing it of special situations or events. Also, the event itself.
See signal (2).
single-user state
A condition of the HP-UX operating system in which the system console provides the only communication
mechanism between the system and its user. By convention, single-user state is usually specified by
init (1M) as run-level
S or s. Do not confuse single-user state, in which the software is limiting a mul-
tiuser system to a single-user communication, with a single-user system, which can never communicate
with more than one fixed terminal. See also multiuser state.
slash
The literal character
/.Apath name consisting of a single slash resolves to the root directory of the
process. See also path name resolution.
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