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       cpg_initialize - Create a new connection to the CPG service


       #include <openais/cpg.h>

       int cpg_initialize(cpg_handle_t *handle, cpg_callbacks_t *callbacks);


       The  cpg_initialize  function is used to initialize a connection to the
       closed process groups API.

       Each application may have several connections to  the  CPG  API.   Each
       application   uses   the  handle  argument  to  uniquely  identify  the
       connection.  The handle argument is then used in other  function  calls
       to  identify  the  connection to be used for communication with the CPG

       Every time an CPG event occurs within the  joined  group,  one  of  the
       callbacks  specified by the argument callbacks is called.  The callback
       functions are described by the following type definitions:

              typedef void (*cpg_deliver_fn_t) (
                      cpg_handle_t handle,
                      struct cpg_name *group_name,
                      uint32_t nodeid,
                      uint32_t pid,
                      void *msg,
                      int msg_len);

              typedef void (*cpg_confchg_fn_t) (
                      cpg_handle_t handle,
                      struct cpg_name *group_name,
                      struct cpg_address *member_list, int member_list_entries,
                      struct cpg_address *left_list, int left_list_entries,
                      struct cpg_address *joined_list, int joined_list_entries);

       The callbacks argument is of the type:

              typedef struct {
                      cpg_deliver_fn_t cpg_deliver_fn;
                      cpg_confchg_fn_t cpg_confchg_fn;
              } cpg_callbacks_t;

       When a configuration change occurs or a message is to be delivered  one
       of  the  callbacks  is  called  from the cpg_dispatch() function.  If a
       configuration change occurs, cpg_confchg_fn is called.  If  a  delivery
       of a message occurs, cpg_deliver_fn is called.

       The cpg_address structure is defined

              struct cpg_address {
                      unsigned int nodeid;
                      unsigned int pid;
                      unsigned int reason;

       where  nodeid is a 32 bit unique node identifier, pid is the process ID
       of the process that has joined/left the group or sent the message,  and
       reason  is an integer code indicating why the node join/left the group.

              CPG_REASON_JOIN     - the process joined a group using cpg_join().
              CPG_REASON_LEAVE    - the process left a group using cpg_leave()
              CPG_REASON_NODEDOWN - the process left a group because the node left the cluster.
              CPG_REASON_NODEUP   - the process joined a group because it was already a member of a group on a node that has just joined the cluster
              CPG_REASON_PROCDOWN - the process left a group without calling cpg_leave()


       This call returns the CPG_OK value if successful, otherwise an error is


       The errors are undocumented.


       cpg_overview(8),   cpg_finalize(3),   cpg_fd_get(3),   cpg_dispatch(3),
       cpg_join(3), cpg_leave(3), cpg_mcast_joined(3), cpg_mmembership_get(3)