[erlang-questions] what does open_port({fd,0,1},...) do?

[devdoer bird]

Thanks .I read the manual before this mail.But the manul is not very clear.
Can you give more details please? Such as why this special {fd,In,Out}  port
is needed?

2008/10/1 Maxim Treskin <zerthurd@REDACTED>

> erl -man erlang
>
> =====
> open_port(PortName, PortSettings) -> port()
>                     PortName = {spawn, Command} | {fd, In, Out}
>                        Command = string()
>                        In = Out = int()
> ...
>                 {fd, In, Out}:
>                     Allows  an  Erlang  process to access any currently
> opened file descriptors used by Erlang. The file descriptor In can be
>                     used for standard input, and the file descriptor Out
> for standard output. It is only used  for  various  servers  in  the
>                     Erlang operating system (shell and user). Hence, its
> use is very limited.
> =====
>
> --
> Maxim Treskin
>
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