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A simple daemonless system for broadcasting messages locally
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A simple daemonless system for broadcasting messages locally. bus is a light-weight alternative to a two-phase flexible barrier. bus uses a System V semaphore array and System V shared memory. Buses are named; the key of the semaphore array and the shared memory is stored in a regular file. The shared memory used by bus is always 2048 bytes. Additionally all messages should be encoded in UTF-8 and not contain any NULL characters, except they MUST always end with a zero byte. Furthermore messages should be prefixed with the process identifer of the process whence the message originated, followed by a space. If the process is ephemeral, 0 should be used instead of the process identifier. Communication over bus is synchronous. The broadcast call does not return until all listeners have received (and copyied) the message. A malfunctioning program can lock to bus. The software package contains a C library and a command line utility. The package python-bus provides a Python 3 module.
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