const char *bind_path, const char *connect_path);
int get_unix_name_len(socklen_t sun_len);
uint32_t guess_netmask(uint32_t ip);
+int get_null_fd(void);
int read_fully(int fd, void *, size_t, size_t *bytes_read);
int write_fully(int fd, const void *, size_t, size_t *bytes_written);