Enabling tcp

TCP structure uv_tcp_t inherits uv_stream_t

struct uv_tcp_s {
  UV_HANDLE_FIELDS
  UV_STREAM_FIELDS
  UV_TCP_PRIVATE_FIELDS
};

typical TCP connect Sequence

1. uv_tcp_init()

• calls uv__stream_init()

2. uv__stream_init()

• calls uv__handle_init()
• initialises structure members
• calls uv__io_init() with stream->io_watcher and callback uv__stream_io()

3. uv__io_init()

4. uv_tcp_open()

• calls uv__stream_open()

5. uv__stream_open()

• sets stream->io_watcher.fd to socket

6. uv_tcp_connect()

• calls uv__tcp_connect()

7. uv__tcp_connect()

• calls uv__socket() to get socket
• calls uv__stream_open() with socket
• calls connect() with stream.fd which is socket
• calls uv__req_init() with uv_connect_t type connection request req
• sets connection callback to req
• calls uv__io_start() with UV__POLLOUT

8. uv__io_start()

• adds watcher to loop->watcher_queue

9. uv_run()