int global_option_set (const char *option, const char *value, _Bool from_cli);
const char *global_option_get (const char *option);
long global_option_get_long (const char *option, long default_value);
-long global_option_get_long_in_range (const char *option, long default_value, long min, long max);
cdtime_t global_option_get_time (char const *option, cdtime_t default_value);