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-.\" Copyright 2020 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH sysvipc 7 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-sysvipc \- System V interprocess communication mechanisms
-.SH DESCRIPTION
-System V IPC is the name given to three interprocess
-communication mechanisms that are widely available on UNIX systems:
-message queues, semaphore, and shared memory.
-.\"
-.SS Message queues
-System V message queues allow data to be exchanged in units called messages.
-Each message can have an associated priority.
-POSIX message queues provide an alternative API for achieving the same result;
-see
-.BR mq_overview (7).
-.P
-The System V message queue API consists of the following system calls:
-.TP
-.BR msgget (2)
-Create a new message queue or obtain the ID of an existing message queue.
-This call returns an identifier that is used in the remaining APIs.
-.TP
-.BR msgsnd (2)
-Add a message to a queue.
-.TP
-.BR msgrcv (2)
-Remove a message from a queue.
-.TP
-.BR msgctl (2)
-Perform various control operations on a queue, including deletion.
-.\"
-.SS Semaphore sets
-System V semaphores allow processes to synchronize their actions.
-System V semaphores are allocated in groups called sets;
-each semaphore in a set is a counting semaphore.
-POSIX semaphores provide an alternative API for achieving the same result;
-see
-.BR sem_overview (7).
-.P
-The System V semaphore API consists of the following system calls:
-.TP
-.BR semget (2)
-Create a new set or obtain the ID of an existing set.
-This call returns an identifier that is used in the remaining APIs.
-.TP
-.BR semop (2)
-Perform operations on the semaphores in a set.
-.TP
-.BR semctl (2)
-Perform various control operations on a set, including deletion.
-.\"
-.SS Shared memory segments
-System V shared memory allows processes to share a region a memory
-(a "segment").
-POSIX shared memory is an alternative API for achieving the same result; see
-.BR shm_overview (7).
-.P
-The System V shared memory API consists of the following system calls:
-.TP
-.BR shmget (2)
-Create a new segment or obtain the ID of an existing segment.
-This call returns an identifier that is used in the remaining APIs.
-.TP
-.BR shmat (2)
-Attach an existing shared memory object into the calling process's
-address space.
-.TP
-.BR shmdt (2)
-Detach a segment from the calling process's address space.
-.TP
-.BR shmctl (2)
-Perform various control operations on a segment, including deletion.
-.\"
-.SS IPC namespaces
-For a discussion of the interaction of System V IPC objects and
-IPC namespaces, see
-.BR ipc_namespaces (7).
-.SH SEE ALSO
-.BR ipcmk (1),
-.BR ipcrm (1),
-.BR ipcs (1),
-.BR lsipc (1),
-.BR ipc (2),
-.BR msgctl (2),
-.BR msgget (2),
-.BR msgrcv (2),
-.BR msgsnd (2),
-.BR semctl (2),
-.BR semget (2),
-.BR semop (2),
-.BR shmat (2),
-.BR shmctl (2),
-.BR shmdt (2),
-.BR shmget (2),
-.BR ftok (3),
-.BR ipc_namespaces (7)