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fileno()                 Get File Handle Associated with Stream (Macro)

 #include   <stdio.h>

 int        fileno(stream);
 FILE       *stream;                     Pointer to file structure


    fileno() is a macro that returns the file handle of 'stream'.  If
    'stream' has more than one file handle, the return value is the
    handle assigned when the stream was first opened.

    Returns:    The file handle.  There is no error return.  If the
                stream does not specify an open file, the result is
                undefined.

  -------------------------------- Example ---------------------------------

    The following statements open a file and check its length.

         #include <stdio.h>
         #include <io.h>

         FILE *stream;
         int length;

         main()
         {
             if ((stream = fopen("work.dat","r+"))!= NULL) {
                length = filelength(fileno(stream));
             }
         }