socket descriptor returned from socket()

[Andrew N. Below]

Hello.

Could 0 (zero) be a valid socket descriptor?

man 2 socket:

RETURN VALUES
      A -1 is returned if an error occurs, otherwise the return value is a
      descriptor referencing the socket.

I have some troubles with xinetd (2.3.14) - first service
in config file with proto=tcp, socket_type=stream and wait=yes
fail to start (fcntl returns "Bad file descriptor" error).

--
Andrew N. Below