MiniSAPServer is a small program that periodically sends SAP/SDP messages, given a config file and destination address. I’ve prepared a complementary MiniSAPListener program which listens for SAP/SDP messages, and prints them to stdout or passes to a shell command. The source code is mostly extracted from PulseAudio RTP …

Unix domain sockets are a networkless version of Internet sockets. They have several advantages: Unix domain sockets are files, so file-system permissions may be used for them when one end is closed (e.g. process exits), SIGPIPE is delivered to another end performance may be up to 2x better See details here.