bool display_is_local(const char *display);
int socket_from_display(const char *display, char **path);
bool display_is_local(const char *display);
int socket_from_display(const char *display, char **path);
char *format_bytes(char *buf, size_t l, off_t t);
int fd_wait_for_event(int fd, int event, usec_t timeout);
char *format_bytes(char *buf, size_t l, off_t t);
int fd_wait_for_event(int fd, int event, usec_t timeout);
int fd_inc_sndbuf(int fd, size_t n);
int fd_inc_rcvbuf(int fd, size_t n);
int fd_inc_sndbuf(int fd, size_t n);
int fd_inc_rcvbuf(int fd, size_t n);