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Well, if you want more, you can just set it via: #define FD_SETSIZE <value>

Just keep value sane ;) 4096 or 5120 should be okish.

FD_SETSIZE isn't something you can just redefine like that. You'd have to reimplement all the types, macros, etc. yourself.

Yes, it is in fact something you can just redefine yourself. That's not to say you should do it.

Right. You can but generally shouldn't. Like I said upthread, you're better off using poll or epoll.