+int close_nointr(int fd);
+
+int parse_boolean(const char *v);
+
+int safe_atou(const char *s, unsigned *ret_u);
+int safe_atoi(const char *s, int *ret_i);
+
+char *split_spaces(const char *c, size_t *l, char **state);
+
+#define FOREACH_WORD(word, length, s, state) \
+ for ((state) = NULL, (word) = split_spaces((s), &(l), &(state)); (word); (word) = split_spaces((s), &(l), &(state)))