Feature #16597 » 0007-io-document-IO.select_with_poll.patch
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/*
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* call-seq:
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* IO.select(read_array [, write_array [, error_array [, timeout]]]) -> array or nil
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* IO.select(read_array [, write_array [, except_array [, timeout]]]) -> array or nil
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* IO.select_with_poll(read_array [, write_array [, except_array [, error_array [, timeout]]]) -> array or nil
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*
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* Calls select(2) system call.
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* It monitors given arrays of IO objects, waits until one or more of
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* pending exceptions respectively, and returns an array that contains
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* arrays of those IO objects. It will return +nil+ if optional
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* <i>timeout</i> value is given and no IO object is ready in
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* <i>timeout</i> seconds.
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* <i>timeout</i> seconds. Note that 'exceptions' in this context are also
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* known as 'priority data' or out-of-band data and dependent on the
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* file descriptor type designated by the IO object. select(2) cannot detect
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* that the other end of pipe or socket is closed. It can be detected only
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* implicitly for sockets used for reading: select returns the socket as ready
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* and read returns the error.
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*
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* On systems that support poll(2) system call IO.select_with_poll is provided
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* which takes and returns extra array of descriptors. Descriptors in this
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* extra array and all other arrays are checked for error conditions -
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* typically the other side closing the pipe or socket.
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*
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* IO.select peeks the buffer of IO objects for testing readability.
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* If the IO buffer is not empty, IO.select immediately notifies
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