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   ipcs    ( 1 )

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Имя (Name)

ipcs - show information on IPC facilities

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Синопсис (Synopsis)

ipcs [options]

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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.

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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.

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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.

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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.

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