Chapter 11Interprocess Communication

Historically, UNIX systems were weak in the area of interprocess communication. Before the release of 4.2BSD, the only standard interprocess-communication facility found in UNIX was the pipe—a reliable, flow-controlled, byte stream that could be established only between two related processes on the same machine. The limiting nature of pipes inspired many experimental facilities, such as the Rand Corporation UNIX system’s ports [Sunshine, 1977], multiplexed files that were an experimental part of Version 7 UNIX [UPMV7, 1983], and the Accent IPC facility developed at Carnegie-Mellon University [Rashid, 1980]. Some communication facilities were developed for use in application-specific versions of UNIX—for example, ...

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