const MNTPATHLEN = 1024;  /* maximum bytes in a pathname argument */
const MNTNAMLEN = 255;    /* maximum bytes in a name argument */
const FHSIZE = 32;        /* size in bytes of a file handle */

typedef opaque fhandle [FHSIZE];
typedef string name <MNTNAMLEN>;
typedef string dirpath <MNTPATHLEN>;

union fhstatus switch (unsigned fhs_status) {
  case 0:
    fhandle fhs_fhandle;
  default:
    void;
};