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   fileno

   Usage
   #include <stdio.h>
   int fileno(FILE *fp);

   Description
   fileno returns the file descriptor associated with stream fp. This  is
   the same as the DOS file handle. The fp argument must point to a  file
   which is already open.

   The  fileno function converts a file pointer to a file descriptor  for
   use  with the low-level file functions such as close, read and  write.
   Mixing of high and low level functions is not normally recommended.

   Example
   #include <stdio.h>
   main()
   {
   int fd;
   fd = fileno(stderr);
   printf("The file handle for stderr is %d\n",fd);
   fd = fileno(stdaux);
   printf("The file handle for stdaux is %d\n",fd);
   fd = fileno(stdprn);
   printf("The file handle for stdprn is %d\n",fd);
   }
   Return Value
   fileno returns the file descriptor. There is no error return.