Using the Library
All the Other System Calls

const char *explain_name(args...);
const char *explain_errno_name(int errnum, args...);
void explain_message_name(char *msg, size_t msg_size, args...);
void explain_message_errno_name(char *msg, size_t msg_size, int errnum, args...);
type explain_name_or_dir(args...);
type explain_name_on_error(args...);