c - Is sending data via UDP sockets on the same machine reliable?

Question

If i use UDP sockets for interprocess communication, can i expect that all send data is received by the other process in the same order?

I know this is not true for UDP in general.

Answer 1

No. I have been bitten by this before. You may wonder how it can possibly fail, but you'll run into issues of buffers of pending packets filling up, and consequently packets will be dropped. How the network subsystem drops packets is implementation-dependent and not specified anywhere.