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)
• The process’s effective user ID does not match
sem_perm.[c]uid and the
appropriate bit of the ‘‘group’’ portion (060) of
sem_perm.mode
is set.
• The process’s effective user ID does not match
sem_perm.[c]uid and the
process’s effective group ID does not match
sem_perm.[c]gid and neither of
sem_perm.[c]gid is in the process’s group access list and the appropriate bit
of the ‘‘other’’ portion (06) of
sem_perm.mode
is set.
Otherwise, the corresponding permissions are denied.
semid See semaphore identifier.
session Each process group is a member of a session. A process is considered to be a member of
the session of which its process group is a member. A newly created process joins the ses-
sion of its creator. A process can alter its session membership (see setsid (2)). A session
can have multiple process groups (see setpgid (2)).
session leader
A process that has created a session (see setsid(2)).
session lifetime
The period between when a session is created and the end of the lifetime of all process
groups that remain as members of the session.
set-group-ID bit
A single bit in the mode of every file in the file system. If a file is executed whose set-
group-ID bit is set, the effective group ID of the process which executed the file is set
equal to the real group ID of the owner of the file. See also group.
set-user-ID bit
A single bit in the mode of every file in the file system. If a file is executed whose set-
user-ID bit is set, the effective user ID of the process that executed the file is set equal
to the real user ID of the owner of the file.
shared library
An executable file that can be shared between several different programs. Code from a
shared library is not linked into the program by ld(1), but is instead mapped into the
process’ address space at run time by the dynamic loader. Shared libraries must contain
position-independent code, and are created by ld(1). They typically have the file name
suffix
.sl.
shared memory identifier (shmid)
A unique positive integer created by a shmget(2) system call. Each shmid has a segment
of memory (referred to as a shared memory segment) and a data structure associated
with it. The data structure is referred to as
shmid_ds and contains the following
members:
struct
ipc_perm shm_perm; /* operation permission struct */
int shm_segsz; /* size of segment */
ushort shm_cpid; /* creator pid */
ushort shm_lpid; /* pid of last operation */
uint shm_nattch; /* number of current attaches */
time_t shm_atime; /* last attach time */
time_t shm_dtime; /* last detach time */
time_t shm_ctime; /* last change time */
/* Times measured in secs since */
/* 00:00:00 GMT, Jan. 1, 1970 */
Shared memory identifiers can be created using ftok(3C).
shm_perm is a ipc_perm structure that specifies the permission for a shmop(2) or
shmctl(2) operation (see below). This structure includes the following members:
ushort cuid; /* creator user id */
ushort cgid; /* creator group id */
ushort uid; /* user id */
ushort gid; /* group id */
ushort mode; /* r/w permission */
Section 9−−20 Hewlett-Packard Company − 19 − HP-UX 11i Version 2: August 2003