def single_instance_unix(name: str) -> bool: import socket for path in unix_socket_paths(name): socket_path = path.rpartition('.')[0] + '.sock' fd = os.open(path, os.O_CREAT | os.O_WRONLY | os.O_TRUNC | os.O_CLOEXEC) try: fcntl.lockf(fd, fcntl.LOCK_EX | fcntl.LOCK_NB) except OSError as err: if err.errno in (errno.EAGAIN, errno.EACCES): # Client s = socket.socket(family=socket.AF_UNIX) s.connect(socket_path) single_instance.socket = s return False raise s = socket.socket(family=socket.AF_UNIX) try: s.bind(socket_path) except OSError as err: if err.errno in (errno.EADDRINUSE, errno.EEXIST): os.unlink(socket_path) s.bind(socket_path) else: raise single_instance.socket = s # prevent garbage collection from closing the socket atexit.register(remove_socket_file, s, socket_path) s.listen() s.set_inheritable(False) return True return False
def __call__(self, group_id: Optional[str] = None) -> bool: import socket name = '{}-ipc-{}'.format(appname, os.geteuid()) if group_id: name += '-{}'.format(group_id) s = socket.socket(family=socket.AF_UNIX) # First try with abstract UDS addr = '\0' + name try: s.bind(addr) except OSError as err: if err.errno == errno.ENOENT: return single_instance_unix(name) if err.errno == errno.EADDRINUSE: s.connect(addr) self.socket = s return False raise s.listen() self.socket = s # prevent garbage collection from closing the socket s.set_inheritable(False) atexit.register(remove_socket_file, s) return True