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Asked: 2026-05-30T17:17:27+00:00

I have a simple UDP socket program in C. The client transmits data to

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I have a simple UDP socket program in C. The client transmits data to the server and receives acknowledgements. I already know how to configure a timeout so that if ‘recvfrom()’ doesn’t receive anything in a certain period of time the alarm goes off.

HOWEVER, there are a few more situations I need to handle. What if I receive a reply from an unexpected address, or the reply is not formatted correctly? I don’t want to retransmit immediately, only when the alarm goes off.

Let me know if I need to clarify.

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1 Answer

  1. Editorial Team

    Look into select(2) and poll(2) – you can wait on a socket for a specified amount of time. You can then restart the wait with lesser timeout if you need.

    If you are on linux, look into epoll(7) and timerfd_create(2).

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