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Other minor wording changes.
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@ -119,11 +119,11 @@ to indicate which descriptors actually changed status.
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.PP
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Four macros are provided to manipulate the sets.
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.BR FD_ZERO ()
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will clear a set.
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clears a set.
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.BR FD_SET ()
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and
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.BR FD_CLR ()
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add or remove a given descriptor from a set.
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respectively add and remove a given descriptor from a set.
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.BR FD_ISSET ()
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tests to see if a descriptor is part of the set; this is useful after
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.BR select ()
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