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Anyone ever use the select() function?

E

engineereeyore

Platinum Member
Ok, I understand how to add file descriptors and the whole idea of what select does. I understand that it returns the number of descriptors that are ready to be read, write, or handled. What I don't understand is how I'm supposed to know WHICH desciptor is ready. Does it reorganize the fd_set array so that all the ones that are ready are at the front of the array, or do I have to go through all of them and check them somehow?

Any help would be greatly appreciated.
 
I believe you use the FD_ISSET macro to determine if a certain descriptor is in the 'ready' category. If you have a Linux box handy there's a select_tut(2) man page in the manpages-dev (on Debian at least) package which might answer your question.
 
You would appear to be correct. I was hoping it was more specific, but I guess that's still much better than performing a read on several different socket descriptors.

Thanks for the info. That man page is very nice.
 
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