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fcntl/dupfdconstant
fcntl/getfdconstant
fcntl/setfdconstant
fcntl/getflconstant
fcntl/setflconstant

Operations used with file-control.

NOTE: On native Windows builds (all except cygwin), these are all defined as zero. The file-control procedure to use these with is also unimplemented and will raise an error when called.