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  3. Unix domain socket - Wikipedia
Unix domain socket - Wikipedia
From Wikipedia, the free encyclopedia

A Unix domain socket (UDS), local socket, or inter-process communication (IPC) socket is a communication endpoint for exchanging data between processes executing in the same Unix or Unix-like operating system.

The name Unix domain socket refers to the domain argument value AF_UNIX that is passed to the function that creates a socket system resource. The same communication domain is also selected by AF_LOCAL. [1]

Valid type argument values for a UDS are:[1]

  • SOCK_STREAM (compare to TCP) – for a stream-oriented socket
  • SOCK_DGRAM (compare to UDP) – for a datagram-oriented socket that preserves message boundaries (as on most UNIX implementations, UNIX domain datagram sockets are always reliable and don't reorder datagrams)
  • SOCK_SEQPACKET (compare to SCTP) – for a sequenced-packet socket that is connection-oriented, preserves message boundaries, and delivers messages in the order that they were sent

The UDS facility is a standard component of a POSIX operating system.

The API for a UDS is similar to that of an Internet socket, but rather than using an underlying network protocol, all communication occurs entirely within the operating system kernel. A UDS may use the file system as its address namespace. Some operating systems, like Linux, offer additional namespaces. Processes reference a UDS as a file system inode, so two processes can communicate by opening the same socket.

In addition to sending data, processes may send file descriptors across a UDS connection using the sendmsg() and recvmsg() system calls. This allows the sending processes to grant the receiving process access to a file descriptor for which the receiving process otherwise does not have access.[2][3] This can be used to implement a rudimentary form of capability-based security.[4]

See also

  • Network socket – Software-based endpoint of network communications
  • Berkeley sockets – Inter-process communication API
  • Pipeline (Unix) – Mechanism for inter-process communication using message passing
  • Netlink – Linux kernel interface for inter-process communication between processes

References

  1. ^ a b "Linux Programmer's Manual (unix - sockets for local interprocess communication)". 30 April 2018. Retrieved 22 February 2019.
  2. ^ "Archive of the "Postfix Discussions" mailing list". 30 September 2000. Archived from the original on 18 May 2013. Retrieved 29 September 2014.
  3. ^ "Linux man page - cmsg(3): access ancillary data". Retrieved 9 October 2018.
  4. ^ ""Secure Programming for Linux and Unix HOWTO", Section 3.4 "Sockets and Network Connections"". dwheeler.com. David A. Wheeler. 22 August 2004. Retrieved 29 September 2014.

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