int parse_options_end(struct parse_opt_ctx_t *ctx);
+struct option *parse_options_dup(const struct option *a);
struct option *parse_options_concat(struct option *a, struct option *b);
/*----- some often used options -----*/
int parse_opt_tertiary(const struct option *, const char *, int);
int parse_opt_string_list(const struct option *, const char *, int);
int parse_opt_noop_cb(const struct option *, const char *, int);
-int parse_opt_unknown_cb(struct parse_opt_ctx_t *ctx, const struct option *, const char *, int);
+enum parse_opt_result parse_opt_unknown_cb(struct parse_opt_ctx_t *ctx,
+ const struct option *,
+ const char *, int);
int parse_opt_passthru(const struct option *, const char *, int);
int parse_opt_passthru_argv(const struct option *, const char *, int);