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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)
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Linux man-pages 6.9.1 2024-05-02 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 2024-06-26 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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