ssize_t (*store)(struct krb5_storage_data*, const void*, size_t);
off_t (*seek)(struct krb5_storage_data*, off_t, int);
int (*trunc)(struct krb5_storage_data*, off_t);
+ int (*fsync)(struct krb5_storage_data*);
void (*free)(struct krb5_storage_data*);
krb5_flags flags;
int eof_code;