I have a program that recevice message in udp in visual studio.
sometime I miss a message.I want to use select to see udp buffer used size if udp rec buffer is full.
How I can use select for this purpose?
where can I see a example?
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I have a program that recevice message in udp in visual studio.
sometime I miss a message.I want to use select to see udp buffer used size if udp rec buffer is full.
How I can use select for this purpose?
where can I see a example?
Post-fact discovery that your receive buffer is full will not do you any good – packets have already been dropped. Even more – you need to set your buffer sizes before
connect()orbind(), they will not change after that.What you should do is pre-set socket receive buffer to some large value that would accommodate your traffic spikes, and try to process your network input faster. That usually means doing
select()on non-blocking sockets (or even better – some advanced API like Linuxepoll(7)in edge-triggered mode), and draining socket input until you getEWOULDBLOCK.Edit 0:
You cannot discover that you missed a UDP packet by using
select()or any other socket API. This has to be done in the application-level protocol, i.e. one layer up from the transport. Common practice is including sequence numbers in application message header.