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.
System V message queues allow data to be exchanged in units called messages. Each messages can have an associated priority, POSIX message queues provide an alternative API for achieving the same result; see mq_overview(7).
The System V message queue API consists of the following system calls:
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.
Add a message to a queue.
Remove a message from a queue.
Perform various control operations on a queue, including deletion.
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 sem_overview(7).
The System V semaphore API consists of the following system calls:
Create a new set or obtain the ID of an existing set. This call returns an identifier that is used in the remaining APIs.
Perform operations on the semaphores in a set.
Perform various control operations on a set, including deletion.
For a discussion of the interaction of System V IPC objects and IPC namespaces, see ipc_namespaces(7).
ipcmk(1), ipcrm(1), ipcs(1), lsipc(1), ipc(2), msgctl(2), msgget(2), msgrcv(2), msgsnd(2), semctl(2), semget(2), semop(2), shmat(2), shmctl(2), shmdt(2), shmget(2), ftok(3), ipc_namespaces(7)
This page is part of release 5.11 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
ftok(3), intro(2), ipc(2), ipcmk(1), ipc_namespaces(7), ipcrm(1), ipcs(1), lsipc(1), msgctl(2), msgget(2), msgop(2), proc(5), semctl(2), semget(2), semop(2), shmctl(2), shmget(2), shmop(2), systemd.exec(5).
The man page svipc(7) is an alias of sysvipc(7).