# Class Netchannels.socket_descr

    class socket_descr : ?start_pos_in:int -> ?start_pos_out:int -> Unix.file_descr -> raw_io_channel

Creates a `raw_io_channel` for the passed socket descriptor, which must be open for reading and writing, and not yet shut down in either direction. The `raw_io_channel` is used to represent a bidirectional channel: `close_out` shuts the socket down for sending, `close_in` shuts the socket down for reading, and when both directions are down, the descriptor is closed.

The `pos_in` and `pos_out` methods returns logical positions.

`start_pos_in` : The position to which `pos_in` is initialized when the channel is created, by default 0
`start_pos_out` : The position to which `pos_out` is initialized when the channel is created, by default 0