TCP/UDP: partial or multiple messages in one buffer

This is often mentioned in IV. At least you can demonstrate your knowledge.

What if the UDP datagram is too big for recv() i.e. specified buffer length is too small? P116 [[tcp/ip soclets in C]] seems to say the oversize message is silently truncated.

UDP recv() will only return a single “logical” message [1]. I believe TCP can put partial or multiple messages into one “buffer” for recv().

Q: if my buffer is big enough, will my UDP recv() ever truncate a msg?
%%A: never

Note IP would always deliver a whole msg or miss a whole msg, never a partial msg. See P 329 [[comp networking]]

[1] a logical msg is the payload from one send()

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