Function group_session_builder_create_session 

pub unsafe extern "C" fn group_session_builder_create_session(
    builder: *mut group_session_builder,
    distribution_message: *mut *mut sender_key_distribution_message,
    sender_key_name: *const signal_protocol_sender_key_name,
) -> c_int

Construct a group session for sending messages.

@param distribution_message a distribution message to be allocated and populated @param sender_key_name the (groupId, senderId, deviceId) tuple. In this case, the sender should be the caller @return 0 on success, or negative on failure