Any reccomendations of a libary which I can call from my Linux (C) app to send simple log messages to anyone who happens to be listening on the network, using Multicast UDP?
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Any reccomendations of a libary which I can call from my Linux (C) app to send simple log messages to anyone who happens to be listening on the network, using Multicast UDP?
You don’t need a library to send a multicast packet. Sending a UDP message to a multicast socket is only marginally more complicated than sending one to a unicast address.
In particular you’ll need to use
setsockoptto set theIP_MULTICAST_TTLof your packets.The receiving side is slightly harder – you have to join a particular multicast group using
setsockoptwithIP_ADD_MEMBERSHIPto be able to receive the messages sent to it.These options are all documented in
man 7 ip.