Merging upstream version 6.8.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+.\" Copyright 2020 Michael Kerrisk <mtk.manpages@gmail.com>
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.TH sysvipc 7 2024-05-02 "Linux man-pages (unreleased)"
+.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)