code: def bind_unix_socket(self, bind_addr):
          
          if IS_WINDOWS:
              """
              Trying to access socket.AF_UNIX under Windows
              causes an AttributeError.
              """
              raise ValueError(  # or RuntimeError?
                  'AF_UNIX sockets are not supported under Windows.',
              )
  
          fs_permissions = 0o777  # TODO: allow changing mode
  
          try:
              # Make possible reusing the socket...
              os.unlink(self.bind_addr)
          except OSError:
              """
              File does not exist, which is the primary goal anyway.
              """
  
          sock = self.prepare_socket(
              bind_addr=bind_addr,
              family=socket.AF_UNIX, type=socket.SOCK_STREAM, proto=0,
              nodelay=self.nodelay, ssl_adapter=self.ssl_adapter,
          )
  
          try:
              """Linux way of pre-populating fs mode permissions."""
              # Allow everyone access the socket...
              os.fchmod(sock.fileno(), fs_permissions)
              FS_PERMS_SET = True
          except OSError:
              FS_PERMS_SET = False
  
          try:
              sock = self.bind_socket(sock, bind_addr)
          except socket.error:
              sock.close()
              raise
  
          bind_addr = self.resolve_real_bind_addr(sock)
  
          try:
              """FreeBSD/macOS pre-populating fs mode permissions."""
              if not FS_PERMS_SET:
                  try:
                      os.lchmod(bind_addr, fs_permissions)
                  except AttributeError:
                      os.chmod(bind_addr, fs_permissions, follow_symlinks=False)
                  FS_PERMS_SET = True
          except OSError:
              pass
  
          if not FS_PERMS_SET:
              self.error_log(
                  'Failed to set socket fs mode permissions',
                  level=logging.WARNING,
              )
  
          self.bind_addr = bind_addr
          self.socket = sock
          return sock
docs: Create (or recreate) a UNIX socket object.