Return_Values

   0                  Successful completion.
   -1                 Indicates an error. The function sets errno to
                      one of the following values:

                      o  EEXIST - The link named by path2 exists.

                      o  EFTYPE - Wildcards appear in either path1
                         or path2.

                      o  EINVAL - One or both arguments specify a
                         syntactically invalid pathname.

                      o  ENAMETOOLONG - The length of path1 or path2
                         exceeds PATH_MAX, or a pathname component
                         is longer than NAME_MAX.

                      o  EXDEV - The link named by path2 and
                         the filenamed by path1 are on different
                         devices.