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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _fileno routine (implemented both as a function and as a
     macro) returns the file handle currently associated with
     <stream>.
 
     Return Value
 
     The _fileno routine returns the file handle. There is no error
     return. The result is undefined if <stream> does not specify an
     open file.
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