показать информацию об объектах МПК (show information on IPC facilities)
Имя (Name)
ipcs - show information on IPC facilities
Синопсис (Synopsis)
ipcs [options]
Описание (Description)
ipcs shows information on System V inter-process communication
facilities. By default it shows information about all three
resources: shared memory segments, message queues, and semaphore
arrays.
Параметры (Options)
-i, --id id
Show full details on just the one resource element identified
by id. This option needs to be combined with one of the three
resource options: -m, -q or -s.
-h, --help
Display help text and exit.
-V, --version
Display version information and exit.
Resource options
-m, --shmems
Write information about active shared memory segments.
-q, --queues
Write information about active message queues.
-s, --semaphores
Write information about active semaphore sets.
-a, --all
Write information about all three resources (default).
Output formats
Of these options only one takes effect: the last one specified.
-c, --creator
Show creator and owner.
-l, --limits
Show resource limits.
-p, --pid
Show PIDs of creator and last operator.
-t, --time
Write time information. The time of the last control
operation that changed the access permissions for all
facilities, the time of the last msgsnd(2) and msgrcv(2)
operations on message queues, the time of the last shmat(2)
and shmdt(2) operations on shared memory, and the time of the
last semop(2) operation on semaphores.
-u, --summary
Show status summary.
Representation
These affect only the -l (--limits) option.
-b, --bytes
Print sizes in bytes.
--human
Print sizes in human-readable format.
Стандарты (Conforming to)
The Linux ipcs utility is not fully compatible to the POSIX ipcs
utility. The Linux version does not support the POSIX -a, -b and
-o options, but does support the -l and -u options not defined by
POSIX. A portable application shall not use the -a, -b, -o, -l,
and -u options.
Примечание (Note)
The current implementation of ipcs obtains information about
available IPC resources by parsing the files in /proc/sysvipc.
Before util-linux version v2.23, an alternate mechanism was used:
the IPC_STAT command of msgctl(2), semctl(2), and shmctl(2). This
mechanism is also used in later util-linux versions in the case
where /proc is unavailable. A limitation of the IPC_STAT
mechanism is that it can only be used to retrieve information
about IPC resources for which the user has read permission.
