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A '''Unix ___domain socket''' or '''IPC socket''' ([[inter-process communication]] socket) is a data communications endpoint for exchanging data between processes executing within the same host operating system. While similar in functionality to
[[named pipe]]s, Unix ___domain sockets may be created as [[byte stream]]s or as {{clarify-span|[[datagram]] sequences}}, while pipes are byte streams only. Processes using Unix ___domain sockets do not need to share a common ancestry. The [[API]] for Unix ___domain sockets is similar to that of an [[Internet socket]], but it does not use an underlying network protocol for communication. The Unix ___domain socket facility is a standard component of [[POSIX]] [[operating system]]s.
Unix ___domain sockets use the file system as address [[Namespace (computer science)|name space]]. They are referenced by processes as [[inodes]] in the file system. This allows two processes to open the same socket in order to communicate. However, communication occurs entirely within the operating system kernel.
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