Nmap Development: Re: Next issue (Re: Help: fd_set porting to Win32?)

[doug () hcsw org]

And one more thing. Sorry if this is obvious but just in case
you didn't know: select()/poll()/kqueue()/epoll() don't do
anything meaningful for normal files. They are only for descriptors
that are subject to flow control (like sockets). Non-blocking
IO is the same: read() to regular files WILL block while the
disk's head seeks to the location on disk. You can't avoid
this with conventional unix APIs (but see linux's aio etc).

Doug

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