Working with Socket Attributes

SourcePro : Essential Networking Module User’s Guide : PART II The Networking Package : The Berkeley Sockets Adapter : Socket Multiplexing : Working with Socket Attributes

Socket attributes indicate conditions on a socket. For example, a socket attribute might indicate that a socket is ready for reading or writing, or that it is successfully connected. When a socket attribute is true, it means that the corresponding operation on the socket can be executed without blocking.

A socket attribute is represented by an instance of the RWSocketAttribute class. An RWSocketAttribute has two parts: a socket and an attribute, where the attribute is a combination of any of the following:

RWSocketAttribute::sock_attr_canread	Data is available for reading.
RWSocketAttribute::sock_attr_canwrite	Data can be written on the socket.
RWSocketAttribute::sock_attr_exception	An exceptional condition, such as the arrival of out-of-band data, has occurred.
RWSocketAttribute::sock_attr_isconnected	The socket is connected.
RWSocketAttribute::sock_attr_canaccept	A connection has arrived on this socket and can be received using RWSocket::accept().

Applications can set multiple attributes by bitwise OR-ing them together.