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On some systems the main function returns an exit code

main() Is perfectly legal, no need for a return type. Remember that main is just a function, so like any other function, it can have a return type of nothing (void).

First of all, I don't see why you need the typedef struct there at all. And secondly if you want to use a typedef struct, you might want to give it a second argument?

typedef unsigned int U_INT;...

It seems like I'm the only programmer here who programs sockets in a Unix environment. I humbly advise anyone using Winsocks to migrate to Unix or Linux sockets.. Is there anyone out there who has...