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### 4.2 Call Unix `select` on Octave streams

Note that for cluster connections select_sockets should be used instead.

Loadable Function: [n, ridx, widx, eidx] = select (read_fids, write_fids, except_fids, timeout[, nfds])

  Calls Unix `select`, see the respective manual.

  The following interface was chosen: read_fids, write_fids, except_fids: vectors of stream-ids. timeout: seconds, negative for infinite. nfds: optional, default is Unix’ FD_SETSIZE (platform specific). An error is returned if nfds or a filedescriptor belonging to a stream-id plus one exceeds FD_SETSIZE. Return values are: n: number of ready streams. ridx, widx, eidx: index vectors of ready streams in read_fids, write_fids, and except_fids, respectively.