See Also
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In some instances sockets joined to a multipoint session may have some behavioral differences from point-to-point sockets. For example, a d_leaf socket in a rooted data plane scheme can only send information to the d_root participant. This creates a need for the client to be able to indicate the intended use of a socket coincident with its creation. This is done through the following four multipoint attribute flags that can be set through the dwFlagsparameter in WSPSocket:
- WSA_FLAG_MULTIPOINT_C_ROOT, for the creation of a socket acting
as a c_root, and only allowed if a rooted control plane is
indicated in the corresponding
WSAPROTOCOL_INFOWentry.
- WSA_FLAG_MULTIPOINT_C_LEAF, for the creation of a socket acting
as a c_leaf, and only allowed if XP1_SUPPORT_MULTIPOINT is
indicated in the corresponding
WSAPROTOCOL_INFOWentry.
- WSA_FLAG_MULTIPOINT_D_ROOT, for the creation of a socket acting
as a d_root, and only allowed if a rooted data plane is indicated
in the corresponding
WSAPROTOCOL_INFOWentry.
- WSA_FLAG_MULTIPOINT_D_LEAF, for the creation of a socket acting
as a d_leaf, and only allowed if XP1_SUPPORT_MULTIPOINT is
indicated in the corresponding
WSAPROTOCOL_INFOWentry.
When creating a multipoint socket, exactly one of the two control plane flags, and one of the two data plane flags must be set in the WSPSocket dwFlagsparameter. Thus, the following four possibilities for creating multipoint sockets are: "c_root/d_root", "c_root/d_leaf", "c_leaf/d_root", or "c_leaf /d_leaf".