Description

   The rewind function is equivalent to fseek (file_ptr, 0, SEEK_
   SET). You can use the rewind function with either record or
   stream files.

   A successful call to rewind clears the error indicator for the
   file.

   The ANSI C standard defines rewind as not returning a value;
   therefore, the function prototype for rewind is declared with a
   return type of void. However, since a rewind can fail, and since
   previous versions of the C RTL have declared rewind to
   return an int, the code for rewind does return 0 on success and
   -1 on failure.

   See also fseek.