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NAME | DESCRIPTION | SEE ALSO | COLOPHON |
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sysvipc(7) Miscellaneous Information Manual sysvipc(7)
sysvipc - System V interprocess communication mechanisms
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.
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 mq_overview(7).
The System V message queue API consists of the following system
calls:
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.
msgsnd(2)
Add a message to a queue.
msgrcv(2)
Remove a message from a queue.
msgctl(2)
Perform various control operations on a queue, including
deletion.
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
sem_overview(7).
The System V semaphore API consists of the following system calls:
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.
semop(2)
Perform operations on the semaphores in a set.
semctl(2)
Perform various control operations on a set, including
deletion.
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 shm_overview(7).
The System V shared memory API consists of the following system
calls:
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.
shmat(2)
Attach an existing shared memory object into the calling
process's address space.
shmdt(2)
Detach a segment from the calling process's address space.
shmctl(2)
Perform various control operations on a segment, including
deletion.
IPC namespaces
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 the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
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⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
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part of the original manual page), send a mail to
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Linux man-pages 6.15 2025-05-17 sysvipc(7)
Pages that refer to this page: ipcmk(1), ipcrm(1), ipcs(1), lsipc(1), intro(2), ipc(2), msgctl(2), msgget(2), msgop(2), semctl(2), semget(2), semop(2), shmctl(2), shmget(2), shmop(2), ftok(3), proc_sysvipc(5), systemd.exec(5), ipc_namespaces(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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