C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
_fileno
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <stdio.h>
 
  Syntax:    int _fileno( FILE *stream );
 
  Returns:   the file handle; no error return.
 
  See also:  _filelength, freopen, fopen, _fstat
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