Цитата:
The select function determines the status of one or more sockets, waiting if necessary, to perform synchronous I/O.
Return Value
The select function returns the total number of socket handles that are ready and contained in the fd_set structures, zero if the time limit expired, or SOCKET_ERROR if an error occurred. If the return value is SOCKET_ERROR, WSAGetLastError can be used to retrieve a specific error code.
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handle не перепутал, который передаешь? может серверный передаешь?